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