1 /*
   2  * Copyright (c) 1997, 2014, 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/stringTable.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/sweeper.hpp"
  56 #include "runtime/task.hpp"
  57 #include "runtime/thread.inline.hpp"
  58 #include "runtime/timer.hpp"
  59 #include "runtime/vm_operations.hpp"
  60 #include "services/memReporter.hpp"
  61 #include "services/memTracker.hpp"
  62 #include "trace/tracing.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 
 100 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
 101 
 102 GrowableArray<Method*>* collected_profiled_methods;
 103 
 104 int compare_methods(Method** a, Method** b) {
 105   // %%% there can be 32-bit overflow here
 106   return ((*b)->invocation_count() + (*b)->compiled_invocation_count())
 107        - ((*a)->invocation_count() + (*a)->compiled_invocation_count());
 108 }
 109 
 110 void collect_profiled_methods(Method* m) {
 111   Thread* thread = Thread::current();
 112   // This HandleMark prevents a huge amount of handles from being added
 113   // to the metadata_handles() array on the thread.
 114   HandleMark hm(thread);
 115   methodHandle mh(thread, m);
 116   if ((m->method_data() != NULL) &&
 117       (PrintMethodData || CompilerOracle::should_print(mh))) {
 118     collected_profiled_methods->push(m);
 119   }
 120 }
 121 
 122 void print_method_profiling_data() {
 123   if (ProfileInterpreter COMPILER1_PRESENT(|| C1UpdateMethodData) &&
 124      (PrintMethodData || CompilerOracle::should_print_methods())) {
 125     ResourceMark rm;
 126     HandleMark hm;
 127     collected_profiled_methods = new GrowableArray<Method*>(1024);
 128     ClassLoaderDataGraph::methods_do(collect_profiled_methods);
 129     collected_profiled_methods->sort(&compare_methods);
 130 
 131     int count = collected_profiled_methods->length();
 132     int total_size = 0;
 133     if (count > 0) {
 134       for (int index = 0; index < count; index++) {
 135         Method* m = collected_profiled_methods->at(index);
 136         ttyLocker ttyl;
 137         tty->print_cr("------------------------------------------------------------------------");
 138         m->print_invocation_count();
 139         tty->print_cr("  mdo size: %d bytes", m->method_data()->size_in_bytes());
 140         tty->cr();
 141         // Dump data on parameters if any
 142         if (m->method_data() != NULL && m->method_data()->parameters_type_data() != NULL) {
 143           tty->fill_to(2);
 144           m->method_data()->parameters_type_data()->print_data_on(tty);
 145         }
 146         m->print_codes();
 147         total_size += m->method_data()->size_in_bytes();
 148       }
 149       tty->print_cr("------------------------------------------------------------------------");
 150       tty->print_cr("Total MDO size: %d bytes", total_size);
 151     }
 152   }
 153 }
 154 
 155 
 156 #ifndef PRODUCT
 157 
 158 // Statistics printing (method invocation histogram)
 159 
 160 GrowableArray<Method*>* collected_invoked_methods;
 161 
 162 void collect_invoked_methods(Method* m) {
 163   if (m->invocation_count() + m->compiled_invocation_count() >= 1 ) {
 164     collected_invoked_methods->push(m);
 165   }
 166 }
 167 
 168 
 169 
 170 
 171 void print_method_invocation_histogram() {
 172   ResourceMark rm;
 173   HandleMark hm;
 174   collected_invoked_methods = new GrowableArray<Method*>(1024);
 175   SystemDictionary::methods_do(collect_invoked_methods);
 176   collected_invoked_methods->sort(&compare_methods);
 177   //
 178   tty->cr();
 179   tty->print_cr("Histogram Over MethodOop Invocation Counters (cutoff = %d):", MethodHistogramCutoff);
 180   tty->cr();
 181   tty->print_cr("____Count_(I+C)____Method________________________Module_________________");
 182   unsigned total = 0, int_total = 0, comp_total = 0, static_total = 0, final_total = 0,
 183       synch_total = 0, nativ_total = 0, acces_total = 0;
 184   for (int index = 0; index < collected_invoked_methods->length(); index++) {
 185     Method* m = collected_invoked_methods->at(index);
 186     int c = m->invocation_count() + m->compiled_invocation_count();
 187     if (c >= MethodHistogramCutoff) m->print_invocation_count();
 188     int_total  += m->invocation_count();
 189     comp_total += m->compiled_invocation_count();
 190     if (m->is_final())        final_total  += c;
 191     if (m->is_static())       static_total += c;
 192     if (m->is_synchronized()) synch_total  += c;
 193     if (m->is_native())       nativ_total  += c;
 194     if (m->is_accessor())     acces_total  += c;
 195   }
 196   tty->cr();
 197   total = int_total + comp_total;
 198   tty->print_cr("Invocations summary:");
 199   tty->print_cr("\t%9d (%4.1f%%) interpreted",  int_total,    100.0 * int_total    / total);
 200   tty->print_cr("\t%9d (%4.1f%%) compiled",     comp_total,   100.0 * comp_total   / total);
 201   tty->print_cr("\t%9d (100%%)  total",         total);
 202   tty->print_cr("\t%9d (%4.1f%%) synchronized", synch_total,  100.0 * synch_total  / total);
 203   tty->print_cr("\t%9d (%4.1f%%) final",        final_total,  100.0 * final_total  / total);
 204   tty->print_cr("\t%9d (%4.1f%%) static",       static_total, 100.0 * static_total / total);
 205   tty->print_cr("\t%9d (%4.1f%%) native",       nativ_total,  100.0 * nativ_total  / total);
 206   tty->print_cr("\t%9d (%4.1f%%) accessor",     acces_total,  100.0 * acces_total  / total);
 207   tty->cr();
 208   SharedRuntime::print_call_statistics(comp_total);
 209 }
 210 
 211 void print_bytecode_count() {
 212   if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
 213     tty->print_cr("[BytecodeCounter::counter_value = %d]", BytecodeCounter::counter_value());
 214   }
 215 }
 216 
 217 AllocStats alloc_stats;
 218 
 219 
 220 
 221 // General statistics printing (profiling ...)
 222 void print_statistics() {
 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 || PrintPreciseRTMLockingStatistics) {
 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 
 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 (PrintMethodFlushingStatistics) {
 319     NMethodSweeper::print();
 320   }
 321 
 322   if (PrintCodeCache2) {
 323     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 324     CodeCache::print_internals();
 325   }
 326 
 327   if (PrintClassStatistics) {
 328     SystemDictionary::print_class_statistics();
 329   }
 330   if (PrintMethodStatistics) {
 331     SystemDictionary::print_method_statistics();
 332   }
 333 
 334   if (PrintVtableStats) {
 335     klassVtable::print_statistics();
 336     klassItable::print_statistics();
 337   }
 338   if (VerifyOops) {
 339     tty->print_cr("+VerifyOops count: %d", StubRoutines::verify_oop_count());
 340   }
 341 
 342   print_bytecode_count();
 343   if (PrintMallocStatistics) {
 344     tty->print("allocation stats: ");
 345     alloc_stats.print();
 346     tty->cr();
 347   }
 348 
 349   if (PrintSystemDictionaryAtExit) {
 350     SystemDictionary::print();
 351   }
 352 
 353   if (PrintBiasedLockingStatistics) {
 354     BiasedLocking::print_counters();
 355   }
 356 
 357 #ifdef ENABLE_ZAP_DEAD_LOCALS
 358 #ifdef COMPILER2
 359   if (ZapDeadCompiledLocals) {
 360     tty->print_cr("Compile::CompiledZap_count = %d", Compile::CompiledZap_count);
 361     tty->print_cr("OptoRuntime::ZapDeadCompiledLocals_count = %d", OptoRuntime::ZapDeadCompiledLocals_count);
 362   }
 363 #endif // COMPILER2
 364 #endif // ENABLE_ZAP_DEAD_LOCALS
 365   // Native memory tracking data
 366   if (PrintNMTStatistics) {
 367     if (MemTracker::is_on()) {
 368       BaselineTTYOutputer outputer(tty);
 369       MemTracker::print_memory_usage(outputer, K, false);
 370     } else {
 371       tty->print_cr("%s", MemTracker::reason());
 372     }
 373   }
 374 }
 375 
 376 #else // PRODUCT MODE STATISTICS
 377 
 378 void print_statistics() {
 379 
 380   if (PrintMethodData) {
 381     print_method_profiling_data();
 382   }
 383 
 384   if (CITime) {
 385     CompileBroker::print_times();
 386   }
 387 
 388   if (PrintCodeCache) {
 389     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 390     CodeCache::print();
 391   }
 392 
 393   if (PrintMethodFlushingStatistics) {
 394     NMethodSweeper::print();
 395   }
 396 
 397 #ifdef COMPILER2
 398   if (PrintPreciseBiasedLockingStatistics || PrintPreciseRTMLockingStatistics) {
 399     OptoRuntime::print_named_counters();
 400   }
 401 #endif
 402   if (PrintBiasedLockingStatistics) {
 403     BiasedLocking::print_counters();
 404   }
 405 
 406   // Native memory tracking data
 407   if (PrintNMTStatistics) {
 408     if (MemTracker::is_on()) {
 409       BaselineTTYOutputer outputer(tty);
 410       MemTracker::print_memory_usage(outputer, K, false);
 411     } else {
 412       tty->print_cr("%s", MemTracker::reason());
 413     }
 414   }
 415 }
 416 
 417 #endif
 418 
 419 
 420 // Helper class for registering on_exit calls through JVM_OnExit
 421 
 422 extern "C" {
 423     typedef void (*__exit_proc)(void);
 424 }
 425 
 426 class ExitProc : public CHeapObj<mtInternal> {
 427  private:
 428   __exit_proc _proc;
 429   // void (*_proc)(void);
 430   ExitProc* _next;
 431  public:
 432   // ExitProc(void (*proc)(void)) {
 433   ExitProc(__exit_proc proc) {
 434     _proc = proc;
 435     _next = NULL;
 436   }
 437   void evaluate()               { _proc(); }
 438   ExitProc* next() const        { return _next; }
 439   void set_next(ExitProc* next) { _next = next; }
 440 };
 441 
 442 
 443 // Linked list of registered on_exit procedures
 444 
 445 static ExitProc* exit_procs = NULL;
 446 
 447 
 448 extern "C" {
 449   void register_on_exit_function(void (*func)(void)) {
 450     ExitProc *entry = new ExitProc(func);
 451     // Classic vm does not throw an exception in case the allocation failed,
 452     if (entry != NULL) {
 453       entry->set_next(exit_procs);
 454       exit_procs = entry;
 455     }
 456   }
 457 }
 458 
 459 // Note: before_exit() can be executed only once, if more than one threads
 460 //       are trying to shutdown the VM at the same time, only one thread
 461 //       can run before_exit() and all other threads must wait.
 462 void before_exit(JavaThread * thread) {
 463   #define BEFORE_EXIT_NOT_RUN 0
 464   #define BEFORE_EXIT_RUNNING 1
 465   #define BEFORE_EXIT_DONE    2
 466   static jint volatile _before_exit_status = BEFORE_EXIT_NOT_RUN;
 467 
 468   // Note: don't use a Mutex to guard the entire before_exit(), as
 469   // JVMTI post_thread_end_event and post_vm_death_event will run native code.
 470   // A CAS or OSMutex would work just fine but then we need to manipulate
 471   // thread state for Safepoint. Here we use Monitor wait() and notify_all()
 472   // for synchronization.
 473   { MutexLocker ml(BeforeExit_lock);
 474     switch (_before_exit_status) {
 475     case BEFORE_EXIT_NOT_RUN:
 476       _before_exit_status = BEFORE_EXIT_RUNNING;
 477       break;
 478     case BEFORE_EXIT_RUNNING:
 479       while (_before_exit_status == BEFORE_EXIT_RUNNING) {
 480         BeforeExit_lock->wait();
 481       }
 482       assert(_before_exit_status == BEFORE_EXIT_DONE, "invalid state");
 483       return;
 484     case BEFORE_EXIT_DONE:
 485       return;
 486     }
 487   }
 488 
 489   // The only difference between this and Win32's _onexit procs is that
 490   // this version is invoked before any threads get killed.
 491   ExitProc* current = exit_procs;
 492   while (current != NULL) {
 493     ExitProc* next = current->next();
 494     current->evaluate();
 495     delete current;
 496     current = next;
 497   }
 498 
 499   // Hang forever on exit if we're reporting an error.
 500   if (ShowMessageBoxOnError && is_error_reported()) {
 501     os::infinite_sleep();
 502   }
 503 
 504   // Stop any ongoing concurrent GC work
 505   Universe::heap()->stop();
 506 
 507   // Terminate watcher thread - must before disenrolling any periodic task
 508   if (PeriodicTask::num_tasks() > 0)
 509     WatcherThread::stop();
 510 
 511   // Print statistics gathered (profiling ...)
 512   if (Arguments::has_profile()) {
 513     FlatProfiler::disengage();
 514     FlatProfiler::print(10);
 515   }
 516 
 517   // shut down the StatSampler task
 518   StatSampler::disengage();
 519   StatSampler::destroy();
 520 
 521   // We do not need to explicitly stop concurrent GC threads because the
 522   // JVM will be taken down at a safepoint when such threads are inactive --
 523   // except for some concurrent G1 threads, see (comment in)
 524   // Threads::destroy_vm().
 525 
 526   // Print GC/heap related information.
 527   if (PrintGCDetails) {
 528     Universe::print();
 529     AdaptiveSizePolicyOutput(0);
 530     if (Verbose) {
 531       ClassLoaderDataGraph::dump_on(gclog_or_tty);
 532     }
 533   }
 534 
 535   if (PrintBytecodeHistogram) {
 536     BytecodeHistogram::print();
 537   }
 538 
 539   if (JvmtiExport::should_post_thread_life()) {
 540     JvmtiExport::post_thread_end(thread);
 541   }
 542 
 543 
 544   EventThreadEnd event;
 545   if (event.should_commit()) {
 546       event.set_javalangthread(java_lang_Thread::thread_id(thread->threadObj()));
 547       event.commit();
 548   }
 549 
 550   // Always call even when there are not JVMTI environments yet, since environments
 551   // may be attached late and JVMTI must track phases of VM execution
 552   JvmtiExport::post_vm_death();
 553   Threads::shutdown_vm_agents();
 554 
 555   // Terminate the signal thread
 556   // Note: we don't wait until it actually dies.
 557   os::terminate_signal_thread();
 558 
 559   print_statistics();
 560   Universe::heap()->print_tracing_info();
 561 
 562   { MutexLocker ml(BeforeExit_lock);
 563     _before_exit_status = BEFORE_EXIT_DONE;
 564     BeforeExit_lock->notify_all();
 565   }
 566 
 567   // Shutdown NMT before exit. Otherwise,
 568   // it will run into trouble when system destroys static variables.
 569   MemTracker::shutdown(MemTracker::NMT_normal);
 570 
 571   if (VerifyStringTableAtExit) {
 572     int fail_cnt = 0;
 573     {
 574       MutexLocker ml(StringTable_lock);
 575       fail_cnt = StringTable::verify_and_compare_entries();
 576     }
 577 
 578     if (fail_cnt != 0) {
 579       tty->print_cr("ERROR: fail_cnt=%d", fail_cnt);
 580       guarantee(fail_cnt == 0, "unexpected StringTable verification failures");
 581     }
 582   }
 583 
 584   #undef BEFORE_EXIT_NOT_RUN
 585   #undef BEFORE_EXIT_RUNNING
 586   #undef BEFORE_EXIT_DONE
 587 }
 588 
 589 void vm_exit(int code) {
 590   Thread* thread = ThreadLocalStorage::is_initialized() ?
 591     ThreadLocalStorage::get_thread_slow() : NULL;
 592   if (thread == NULL) {
 593     // we have serious problems -- just exit
 594     vm_direct_exit(code);
 595   }
 596 
 597   if (VMThread::vm_thread() != NULL) {
 598     // Fire off a VM_Exit operation to bring VM to a safepoint and exit
 599     VM_Exit op(code);
 600     if (thread->is_Java_thread())
 601       ((JavaThread*)thread)->set_thread_state(_thread_in_vm);
 602     VMThread::execute(&op);
 603     // should never reach here; but in case something wrong with VM Thread.
 604     vm_direct_exit(code);
 605   } else {
 606     // VM thread is gone, just exit
 607     vm_direct_exit(code);
 608   }
 609   ShouldNotReachHere();
 610 }
 611 
 612 void notify_vm_shutdown() {
 613   // For now, just a dtrace probe.
 614   HOTSPOT_VM_SHUTDOWN();
 615   HS_DTRACE_WORKAROUND_TAIL_CALL_BUG();
 616 }
 617 
 618 void vm_direct_exit(int code) {
 619   notify_vm_shutdown();
 620   os::wait_for_keypress_at_exit();
 621   ::exit(code);
 622 }
 623 
 624 void vm_perform_shutdown_actions() {
 625   // Warning: do not call 'exit_globals()' here. All threads are still running.
 626   // Calling 'exit_globals()' will disable thread-local-storage and cause all
 627   // kinds of assertions to trigger in debug mode.
 628   if (is_init_completed()) {
 629     Thread* thread = ThreadLocalStorage::is_initialized() ?
 630                      ThreadLocalStorage::get_thread_slow() : NULL;
 631     if (thread != NULL && thread->is_Java_thread()) {
 632       // We are leaving the VM, set state to native (in case any OS exit
 633       // handlers call back to the VM)
 634       JavaThread* jt = (JavaThread*)thread;
 635       // Must always be walkable or have no last_Java_frame when in
 636       // thread_in_native
 637       jt->frame_anchor()->make_walkable(jt);
 638       jt->set_thread_state(_thread_in_native);
 639     }
 640   }
 641   notify_vm_shutdown();
 642 }
 643 
 644 void vm_shutdown()
 645 {
 646   vm_perform_shutdown_actions();
 647   os::wait_for_keypress_at_exit();
 648   os::shutdown();
 649 }
 650 
 651 void vm_abort(bool dump_core) {
 652   vm_perform_shutdown_actions();
 653   os::wait_for_keypress_at_exit();
 654   os::abort(dump_core);
 655   ShouldNotReachHere();
 656 }
 657 
 658 void vm_notify_during_shutdown(const char* error, const char* message) {
 659   if (error != NULL) {
 660     tty->print_cr("Error occurred during initialization of VM");
 661     tty->print("%s", error);
 662     if (message != NULL) {
 663       tty->print_cr(": %s", message);
 664     }
 665     else {
 666       tty->cr();
 667     }
 668   }
 669   if (ShowMessageBoxOnError && WizardMode) {
 670     fatal("Error occurred during initialization of VM");
 671   }
 672 }
 673 
 674 void vm_exit_during_initialization(Handle exception) {
 675   tty->print_cr("Error occurred during initialization of VM");
 676   // If there are exceptions on this thread it must be cleared
 677   // first and here. Any future calls to EXCEPTION_MARK requires
 678   // that no pending exceptions exist.
 679   Thread *THREAD = Thread::current();
 680   if (HAS_PENDING_EXCEPTION) {
 681     CLEAR_PENDING_EXCEPTION;
 682   }
 683   java_lang_Throwable::print(exception, tty);
 684   tty->cr();
 685   java_lang_Throwable::print_stack_trace(exception(), tty);
 686   tty->cr();
 687   vm_notify_during_shutdown(NULL, NULL);
 688 
 689   // Failure during initialization, we don't want to dump core
 690   vm_abort(false);
 691 }
 692 
 693 void vm_exit_during_initialization(Symbol* ex, const char* message) {
 694   ResourceMark rm;
 695   vm_notify_during_shutdown(ex->as_C_string(), message);
 696 
 697   // Failure during initialization, we don't want to dump core
 698   vm_abort(false);
 699 }
 700 
 701 void vm_exit_during_initialization(const char* error, const char* message) {
 702   vm_notify_during_shutdown(error, message);
 703 
 704   // Failure during initialization, we don't want to dump core
 705   vm_abort(false);
 706 }
 707 
 708 void vm_shutdown_during_initialization(const char* error, const char* message) {
 709   vm_notify_during_shutdown(error, message);
 710   vm_shutdown();
 711 }
 712 
 713 JDK_Version JDK_Version::_current;
 714 const char* JDK_Version::_runtime_name;
 715 const char* JDK_Version::_runtime_version;
 716 
 717 void JDK_Version::initialize() {
 718   jdk_version_info info;
 719   assert(!_current.is_valid(), "Don't initialize twice");
 720 
 721   void *lib_handle = os::native_java_library();
 722   jdk_version_info_fn_t func = CAST_TO_FN_PTR(jdk_version_info_fn_t,
 723      os::dll_lookup(lib_handle, "JDK_GetVersionInfo0"));
 724 
 725   if (func == NULL) {
 726     // JDK older than 1.6
 727     _current._partially_initialized = true;
 728   } else {
 729     (*func)(&info, sizeof(info));
 730 
 731     int major = JDK_VERSION_MAJOR(info.jdk_version);
 732     int minor = JDK_VERSION_MINOR(info.jdk_version);
 733     int micro = JDK_VERSION_MICRO(info.jdk_version);
 734     int build = JDK_VERSION_BUILD(info.jdk_version);
 735     if (major == 1 && minor > 4) {
 736       // We represent "1.5.0" as "5.0", but 1.4.2 as itself.
 737       major = minor;
 738       minor = micro;
 739       micro = 0;
 740     }
 741     _current = JDK_Version(major, minor, micro, info.update_version,
 742                            info.special_update_version, build,
 743                            info.thread_park_blocker == 1,
 744                            info.post_vm_init_hook_enabled == 1,
 745                            info.pending_list_uses_discovered_field == 1);
 746   }
 747 }
 748 
 749 void JDK_Version::fully_initialize(
 750     uint8_t major, uint8_t minor, uint8_t micro, uint8_t update) {
 751   // This is only called when current is less than 1.6 and we've gotten
 752   // far enough in the initialization to determine the exact version.
 753   assert(major < 6, "not needed for JDK version >= 6");
 754   assert(is_partially_initialized(), "must not initialize");
 755   if (major < 5) {
 756     // JDK verison sequence: 1.2.x, 1.3.x, 1.4.x, 5.0.x, 6.0.x, etc.
 757     micro = minor;
 758     minor = major;
 759     major = 1;
 760   }
 761   _current = JDK_Version(major, minor, micro, update);
 762 }
 763 
 764 void JDK_Version_init() {
 765   JDK_Version::initialize();
 766 }
 767 
 768 static int64_t encode_jdk_version(const JDK_Version& v) {
 769   return
 770     ((int64_t)v.major_version()          << (BitsPerByte * 5)) |
 771     ((int64_t)v.minor_version()          << (BitsPerByte * 4)) |
 772     ((int64_t)v.micro_version()          << (BitsPerByte * 3)) |
 773     ((int64_t)v.update_version()         << (BitsPerByte * 2)) |
 774     ((int64_t)v.special_update_version() << (BitsPerByte * 1)) |
 775     ((int64_t)v.build_number()           << (BitsPerByte * 0));
 776 }
 777 
 778 int JDK_Version::compare(const JDK_Version& other) const {
 779   assert(is_valid() && other.is_valid(), "Invalid version (uninitialized?)");
 780   if (!is_partially_initialized() && other.is_partially_initialized()) {
 781     return -(other.compare(*this)); // flip the comparators
 782   }
 783   assert(!other.is_partially_initialized(), "Not initialized yet");
 784   if (is_partially_initialized()) {
 785     assert(other.major_version() >= 6,
 786            "Invalid JDK version comparison during initialization");
 787     return -1;
 788   } else {
 789     uint64_t e = encode_jdk_version(*this);
 790     uint64_t o = encode_jdk_version(other);
 791     return (e > o) ? 1 : ((e == o) ? 0 : -1);
 792   }
 793 }
 794 
 795 void JDK_Version::to_string(char* buffer, size_t buflen) const {
 796   size_t index = 0;
 797   if (!is_valid()) {
 798     jio_snprintf(buffer, buflen, "%s", "(uninitialized)");
 799   } else if (is_partially_initialized()) {
 800     jio_snprintf(buffer, buflen, "%s", "(uninitialized) pre-1.6.0");
 801   } else {
 802     index += jio_snprintf(
 803         &buffer[index], buflen - index, "%d.%d", _major, _minor);
 804     if (_micro > 0) {
 805       index += jio_snprintf(&buffer[index], buflen - index, ".%d", _micro);
 806     }
 807     if (_update > 0) {
 808       index += jio_snprintf(&buffer[index], buflen - index, "_%02d", _update);
 809     }
 810     if (_special > 0) {
 811       index += jio_snprintf(&buffer[index], buflen - index, "%c", _special);
 812     }
 813     if (_build > 0) {
 814       index += jio_snprintf(&buffer[index], buflen - index, "-b%02d", _build);
 815     }
 816   }
 817 }