1 /*
   2  * Copyright (c) 1997, 2011, 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/constantPoolOop.hpp"
  37 #include "oops/generateOopMap.hpp"
  38 #include "oops/instanceKlass.hpp"
  39 #include "oops/instanceKlassKlass.hpp"
  40 #include "oops/instanceOop.hpp"
  41 #include "oops/methodOop.hpp"
  42 #include "oops/objArrayOop.hpp"
  43 #include "oops/oop.inline.hpp"
  44 #include "oops/symbol.hpp"
  45 #include "prims/jvmtiExport.hpp"
  46 #include "runtime/aprofiler.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/task.hpp"
  58 #include "runtime/timer.hpp"
  59 #include "runtime/vm_operations.hpp"
  60 #include "trace/tracing.hpp"
  61 #include "trace/traceEventTypes.hpp"
  62 #include "utilities/dtrace.hpp"
  63 #include "utilities/globalDefinitions.hpp"
  64 #include "utilities/histogram.hpp"
  65 #include "utilities/vmError.hpp"
  66 #ifdef TARGET_ARCH_x86
  67 # include "vm_version_x86.hpp"
  68 #endif
  69 #ifdef TARGET_ARCH_sparc
  70 # include "vm_version_sparc.hpp"
  71 #endif
  72 #ifdef TARGET_ARCH_zero
  73 # include "vm_version_zero.hpp"
  74 #endif
  75 #ifdef TARGET_ARCH_arm
  76 # include "vm_version_arm.hpp"
  77 #endif
  78 #ifdef TARGET_ARCH_ppc
  79 # include "vm_version_ppc.hpp"
  80 #endif
  81 #ifdef TARGET_OS_FAMILY_linux
  82 # include "thread_linux.inline.hpp"
  83 #endif
  84 #ifdef TARGET_OS_FAMILY_solaris
  85 # include "thread_solaris.inline.hpp"
  86 #endif
  87 #ifdef TARGET_OS_FAMILY_windows
  88 # include "thread_windows.inline.hpp"
  89 #endif
  90 #ifdef TARGET_OS_FAMILY_bsd
  91 # include "thread_bsd.inline.hpp"
  92 #endif
  93 #ifndef SERIALGC
  94 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp"
  95 #include "gc_implementation/parallelScavenge/psScavenge.hpp"
  96 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp"
  97 #endif
  98 #ifdef COMPILER1
  99 #include "c1/c1_Compiler.hpp"
 100 #include "c1/c1_Runtime1.hpp"
 101 #endif
 102 #ifdef COMPILER2
 103 #include "code/compiledIC.hpp"
 104 #include "compiler/methodLiveness.hpp"
 105 #include "opto/compile.hpp"
 106 #include "opto/indexSet.hpp"
 107 #include "opto/runtime.hpp"
 108 #endif
 109 
 110 #ifndef USDT2
 111 HS_DTRACE_PROBE_DECL(hotspot, vm__shutdown);
 112 #endif /* !USDT2 */
 113 
 114 #ifndef PRODUCT
 115 
 116 // Statistics printing (method invocation histogram)
 117 
 118 GrowableArray<methodOop>* collected_invoked_methods;
 119 
 120 void collect_invoked_methods(methodOop m) {
 121   if (m->invocation_count() + m->compiled_invocation_count() >= 1 ) {
 122     collected_invoked_methods->push(m);
 123   }
 124 }
 125 
 126 
 127 GrowableArray<methodOop>* collected_profiled_methods;
 128 
 129 void collect_profiled_methods(methodOop m) {
 130   methodHandle mh(Thread::current(), m);
 131   if ((m->method_data() != NULL) &&
 132       (PrintMethodData || CompilerOracle::should_print(mh))) {
 133     collected_profiled_methods->push(m);
 134   }
 135 }
 136 
 137 
 138 int compare_methods(methodOop* a, methodOop* b) {
 139   // %%% there can be 32-bit overflow here
 140   return ((*b)->invocation_count() + (*b)->compiled_invocation_count())
 141        - ((*a)->invocation_count() + (*a)->compiled_invocation_count());
 142 }
 143 
 144 
 145 void print_method_invocation_histogram() {
 146   ResourceMark rm;
 147   HandleMark hm;
 148   collected_invoked_methods = new GrowableArray<methodOop>(1024);
 149   SystemDictionary::methods_do(collect_invoked_methods);
 150   collected_invoked_methods->sort(&compare_methods);
 151   //
 152   tty->cr();
 153   tty->print_cr("Histogram Over MethodOop Invocation Counters (cutoff = %d):", MethodHistogramCutoff);
 154   tty->cr();
 155   tty->print_cr("____Count_(I+C)____Method________________________Module_________________");
 156   unsigned total = 0, int_total = 0, comp_total = 0, static_total = 0, final_total = 0,
 157       synch_total = 0, nativ_total = 0, acces_total = 0;
 158   for (int index = 0; index < collected_invoked_methods->length(); index++) {
 159     methodOop m = collected_invoked_methods->at(index);
 160     int c = m->invocation_count() + m->compiled_invocation_count();
 161     if (c >= MethodHistogramCutoff) m->print_invocation_count();
 162     int_total  += m->invocation_count();
 163     comp_total += m->compiled_invocation_count();
 164     if (m->is_final())        final_total  += c;
 165     if (m->is_static())       static_total += c;
 166     if (m->is_synchronized()) synch_total  += c;
 167     if (m->is_native())       nativ_total  += c;
 168     if (m->is_accessor())     acces_total  += c;
 169   }
 170   tty->cr();
 171   total = int_total + comp_total;
 172   tty->print_cr("Invocations summary:");
 173   tty->print_cr("\t%9d (%4.1f%%) interpreted",  int_total,    100.0 * int_total    / total);
 174   tty->print_cr("\t%9d (%4.1f%%) compiled",     comp_total,   100.0 * comp_total   / total);
 175   tty->print_cr("\t%9d (100%%)  total",         total);
 176   tty->print_cr("\t%9d (%4.1f%%) synchronized", synch_total,  100.0 * synch_total  / total);
 177   tty->print_cr("\t%9d (%4.1f%%) final",        final_total,  100.0 * final_total  / total);
 178   tty->print_cr("\t%9d (%4.1f%%) static",       static_total, 100.0 * static_total / total);
 179   tty->print_cr("\t%9d (%4.1f%%) native",       nativ_total,  100.0 * nativ_total  / total);
 180   tty->print_cr("\t%9d (%4.1f%%) accessor",     acces_total,  100.0 * acces_total  / total);
 181   tty->cr();
 182   SharedRuntime::print_call_statistics(comp_total);
 183 }
 184 
 185 void print_method_profiling_data() {
 186   ResourceMark rm;
 187   HandleMark hm;
 188   collected_profiled_methods = new GrowableArray<methodOop>(1024);
 189   SystemDictionary::methods_do(collect_profiled_methods);
 190   collected_profiled_methods->sort(&compare_methods);
 191 
 192   int count = collected_profiled_methods->length();
 193   if (count > 0) {
 194     for (int index = 0; index < count; index++) {
 195       methodOop m = collected_profiled_methods->at(index);
 196       ttyLocker ttyl;
 197       tty->print_cr("------------------------------------------------------------------------");
 198       //m->print_name(tty);
 199       m->print_invocation_count();
 200       tty->cr();
 201       m->print_codes();
 202     }
 203     tty->print_cr("------------------------------------------------------------------------");
 204   }
 205 }
 206 
 207 void print_bytecode_count() {
 208   if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
 209     tty->print_cr("[BytecodeCounter::counter_value = %d]", BytecodeCounter::counter_value());
 210   }
 211 }
 212 
 213 AllocStats alloc_stats;
 214 
 215 
 216 
 217 // General statistics printing (profiling ...)
 218 
 219 void print_statistics() {
 220 
 221 #ifdef ASSERT
 222 
 223   if (CountRuntimeCalls) {
 224     extern Histogram *RuntimeHistogram;
 225     RuntimeHistogram->print();
 226   }
 227 
 228   if (CountJNICalls) {
 229     extern Histogram *JNIHistogram;
 230     JNIHistogram->print();
 231   }
 232 
 233   if (CountJVMCalls) {
 234     extern Histogram *JVMHistogram;
 235     JVMHistogram->print();
 236   }
 237 
 238 #endif
 239 
 240   if (MemProfiling) {
 241     MemProfiler::disengage();
 242   }
 243 
 244   if (CITime) {
 245     CompileBroker::print_times();
 246   }
 247 
 248 #ifdef COMPILER1
 249   if ((PrintC1Statistics || LogVMOutput || LogCompilation) && UseCompiler) {
 250     FlagSetting fs(DisplayVMOutput, DisplayVMOutput && PrintC1Statistics);
 251     Runtime1::print_statistics();
 252     Deoptimization::print_statistics();
 253     SharedRuntime::print_statistics();
 254     nmethod::print_statistics();
 255   }
 256 #endif /* COMPILER1 */
 257 
 258 #ifdef COMPILER2
 259   if ((PrintOptoStatistics || LogVMOutput || LogCompilation) && UseCompiler) {
 260     FlagSetting fs(DisplayVMOutput, DisplayVMOutput && PrintOptoStatistics);
 261     Compile::print_statistics();
 262 #ifndef COMPILER1
 263     Deoptimization::print_statistics();
 264     nmethod::print_statistics();
 265     SharedRuntime::print_statistics();
 266 #endif //COMPILER1
 267     os::print_statistics();
 268   }
 269 
 270   if (PrintLockStatistics || PrintPreciseBiasedLockingStatistics) {
 271     OptoRuntime::print_named_counters();
 272   }
 273 
 274   if (TimeLivenessAnalysis) {
 275     MethodLiveness::print_times();
 276   }
 277 #ifdef ASSERT
 278   if (CollectIndexSetStatistics) {
 279     IndexSet::print_statistics();
 280   }
 281 #endif // ASSERT
 282 #endif // COMPILER2
 283   if (CountCompiledCalls) {
 284     print_method_invocation_histogram();
 285   }
 286   if (ProfileInterpreter COMPILER1_PRESENT(|| C1UpdateMethodData)) {
 287     print_method_profiling_data();
 288   }
 289   if (TimeCompiler) {
 290     COMPILER2_PRESENT(Compile::print_timers();)
 291   }
 292   if (TimeCompilationPolicy) {
 293     CompilationPolicy::policy()->print_time();
 294   }
 295   if (TimeOopMap) {
 296     GenerateOopMap::print_time();
 297   }
 298   if (ProfilerCheckIntervals) {
 299     PeriodicTask::print_intervals();
 300   }
 301   if (PrintSymbolTableSizeHistogram) {
 302     SymbolTable::print_histogram();
 303   }
 304   if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
 305     BytecodeCounter::print();
 306   }
 307   if (PrintBytecodePairHistogram) {
 308     BytecodePairHistogram::print();
 309   }
 310 
 311   if (PrintCodeCache) {
 312     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 313     CodeCache::print();
 314   }
 315 
 316   if (PrintCodeCache2) {
 317     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 318     CodeCache::print_internals();
 319   }
 320 
 321   if (PrintClassStatistics) {
 322     SystemDictionary::print_class_statistics();
 323   }
 324   if (PrintMethodStatistics) {
 325     SystemDictionary::print_method_statistics();
 326   }
 327 
 328   if (PrintVtableStats) {
 329     klassVtable::print_statistics();
 330     klassItable::print_statistics();
 331   }
 332   if (VerifyOops) {
 333     tty->print_cr("+VerifyOops count: %d", StubRoutines::verify_oop_count());
 334   }
 335 
 336   print_bytecode_count();
 337   if (PrintMallocStatistics) {
 338     tty->print("allocation stats: ");
 339     alloc_stats.print();
 340     tty->cr();
 341   }
 342 
 343   if (PrintSystemDictionaryAtExit) {
 344     SystemDictionary::print();
 345   }
 346 
 347   if (PrintBiasedLockingStatistics) {
 348     BiasedLocking::print_counters();
 349   }
 350 
 351 #ifdef ENABLE_ZAP_DEAD_LOCALS
 352 #ifdef COMPILER2
 353   if (ZapDeadCompiledLocals) {
 354     tty->print_cr("Compile::CompiledZap_count = %d", Compile::CompiledZap_count);
 355     tty->print_cr("OptoRuntime::ZapDeadCompiledLocals_count = %d", OptoRuntime::ZapDeadCompiledLocals_count);
 356   }
 357 #endif // COMPILER2
 358 #endif // ENABLE_ZAP_DEAD_LOCALS
 359 }
 360 
 361 #else // PRODUCT MODE STATISTICS
 362 
 363 void print_statistics() {
 364 
 365   if (CITime) {
 366     CompileBroker::print_times();
 367   }
 368 #ifdef COMPILER2
 369   if (PrintPreciseBiasedLockingStatistics) {
 370     OptoRuntime::print_named_counters();
 371   }
 372 #endif
 373   if (PrintBiasedLockingStatistics) {
 374     BiasedLocking::print_counters();
 375   }
 376 }
 377 
 378 #endif
 379 
 380 
 381 // Helper class for registering on_exit calls through JVM_OnExit
 382 
 383 extern "C" {
 384     typedef void (*__exit_proc)(void);
 385 }
 386 
 387 class ExitProc : public CHeapObj<mtInternal> {
 388  private:
 389   __exit_proc _proc;
 390   // void (*_proc)(void);
 391   ExitProc* _next;
 392  public:
 393   // ExitProc(void (*proc)(void)) {
 394   ExitProc(__exit_proc proc) {
 395     _proc = proc;
 396     _next = NULL;
 397   }
 398   void evaluate()               { _proc(); }
 399   ExitProc* next() const        { return _next; }
 400   void set_next(ExitProc* next) { _next = next; }
 401 };
 402 
 403 
 404 // Linked list of registered on_exit procedures
 405 
 406 static ExitProc* exit_procs = NULL;
 407 
 408 
 409 extern "C" {
 410   void register_on_exit_function(void (*func)(void)) {
 411     ExitProc *entry = new ExitProc(func);
 412     // Classic vm does not throw an exception in case the allocation failed,
 413     if (entry != NULL) {
 414       entry->set_next(exit_procs);
 415       exit_procs = entry;
 416     }
 417   }
 418 }
 419 
 420 // Note: before_exit() can be executed only once, if more than one threads
 421 //       are trying to shutdown the VM at the same time, only one thread
 422 //       can run before_exit() and all other threads must wait.
 423 void before_exit(JavaThread * thread) {
 424   #define BEFORE_EXIT_NOT_RUN 0
 425   #define BEFORE_EXIT_RUNNING 1
 426   #define BEFORE_EXIT_DONE    2
 427   static jint volatile _before_exit_status = BEFORE_EXIT_NOT_RUN;
 428 
 429   // Note: don't use a Mutex to guard the entire before_exit(), as
 430   // JVMTI post_thread_end_event and post_vm_death_event will run native code.
 431   // A CAS or OSMutex would work just fine but then we need to manipulate
 432   // thread state for Safepoint. Here we use Monitor wait() and notify_all()
 433   // for synchronization.
 434   { MutexLocker ml(BeforeExit_lock);
 435     switch (_before_exit_status) {
 436     case BEFORE_EXIT_NOT_RUN:
 437       _before_exit_status = BEFORE_EXIT_RUNNING;
 438       break;
 439     case BEFORE_EXIT_RUNNING:
 440       while (_before_exit_status == BEFORE_EXIT_RUNNING) {
 441         BeforeExit_lock->wait();
 442       }
 443       assert(_before_exit_status == BEFORE_EXIT_DONE, "invalid state");
 444       return;
 445     case BEFORE_EXIT_DONE:
 446       return;
 447     }
 448   }
 449 
 450   // The only difference between this and Win32's _onexit procs is that
 451   // this version is invoked before any threads get killed.
 452   ExitProc* current = exit_procs;
 453   while (current != NULL) {
 454     ExitProc* next = current->next();
 455     current->evaluate();
 456     delete current;
 457     current = next;
 458   }
 459 
 460   // Hang forever on exit if we're reporting an error.
 461   if (ShowMessageBoxOnError && is_error_reported()) {
 462     os::infinite_sleep();
 463   }
 464 
 465   // Terminate watcher thread - must before disenrolling any periodic task
 466   if (PeriodicTask::num_tasks() > 0)
 467     WatcherThread::stop();
 468 
 469   // Print statistics gathered (profiling ...)
 470   if (Arguments::has_profile()) {
 471     FlatProfiler::disengage();
 472     FlatProfiler::print(10);
 473   }
 474 
 475   // shut down the StatSampler task
 476   StatSampler::disengage();
 477   StatSampler::destroy();
 478 
 479   // We do not need to explicitly stop concurrent GC threads because the
 480   // JVM will be taken down at a safepoint when such threads are inactive --
 481   // except for some concurrent G1 threads, see (comment in)
 482   // Threads::destroy_vm().
 483 
 484   // Print GC/heap related information.
 485   if (PrintGCDetails) {
 486     Universe::print();
 487     AdaptiveSizePolicyOutput(0);
 488   }
 489 
 490 
 491   if (Arguments::has_alloc_profile()) {
 492     HandleMark hm;
 493     // Do one last collection to enumerate all the objects
 494     // allocated since the last one.
 495     Universe::heap()->collect(GCCause::_allocation_profiler);
 496     AllocationProfiler::disengage();
 497     AllocationProfiler::print(0);
 498   }
 499 
 500   if (PrintBytecodeHistogram) {
 501     BytecodeHistogram::print();
 502   }
 503 
 504   if (JvmtiExport::should_post_thread_life()) {
 505     JvmtiExport::post_thread_end(thread);
 506   }
 507 
 508   EVENT_BEGIN(TraceEventThreadEnd, event);
 509   EVENT_COMMIT(event,
 510       EVENT_SET(event, javalangthread, java_lang_Thread::thread_id(thread->threadObj())));
 511 
 512   // Always call even when there are not JVMTI environments yet, since environments
 513   // may be attached late and JVMTI must track phases of VM execution
 514   JvmtiExport::post_vm_death();
 515   Threads::shutdown_vm_agents();
 516 
 517   // Terminate the signal thread
 518   // Note: we don't wait until it actually dies.
 519   os::terminate_signal_thread();
 520 
 521   print_statistics();
 522   Universe::heap()->print_tracing_info();
 523 
 524   { MutexLocker ml(BeforeExit_lock);
 525     _before_exit_status = BEFORE_EXIT_DONE;
 526     BeforeExit_lock->notify_all();
 527   }
 528 
 529   #undef BEFORE_EXIT_NOT_RUN
 530   #undef BEFORE_EXIT_RUNNING
 531   #undef BEFORE_EXIT_DONE
 532 }
 533 
 534 void vm_exit(int code) {
 535   Thread* thread = ThreadLocalStorage::is_initialized() ?
 536     ThreadLocalStorage::get_thread_slow() : NULL;
 537   if (thread == NULL) {
 538     // we have serious problems -- just exit
 539     vm_direct_exit(code);
 540   }
 541 
 542   if (VMThread::vm_thread() != NULL) {
 543     // Fire off a VM_Exit operation to bring VM to a safepoint and exit
 544     VM_Exit op(code);
 545     if (thread->is_Java_thread())
 546       ((JavaThread*)thread)->set_thread_state(_thread_in_vm);
 547     VMThread::execute(&op);
 548     // should never reach here; but in case something wrong with VM Thread.
 549     vm_direct_exit(code);
 550   } else {
 551     // VM thread is gone, just exit
 552     vm_direct_exit(code);
 553   }
 554   ShouldNotReachHere();
 555 }
 556 
 557 void notify_vm_shutdown() {
 558   // For now, just a dtrace probe.
 559 #ifndef USDT2
 560   HS_DTRACE_PROBE(hotspot, vm__shutdown);
 561   HS_DTRACE_WORKAROUND_TAIL_CALL_BUG();
 562 #else /* USDT2 */
 563   HOTSPOT_VM_SHUTDOWN();
 564 #endif /* USDT2 */
 565 }
 566 
 567 void vm_direct_exit(int code) {
 568   notify_vm_shutdown();
 569   os::wait_for_keypress_at_exit();
 570   ::exit(code);
 571 }
 572 
 573 void vm_perform_shutdown_actions() {
 574   // Warning: do not call 'exit_globals()' here. All threads are still running.
 575   // Calling 'exit_globals()' will disable thread-local-storage and cause all
 576   // kinds of assertions to trigger in debug mode.
 577   if (is_init_completed()) {
 578     Thread* thread = ThreadLocalStorage::is_initialized() ?
 579                      ThreadLocalStorage::get_thread_slow() : NULL;
 580     if (thread != NULL && thread->is_Java_thread()) {
 581       // We are leaving the VM, set state to native (in case any OS exit
 582       // handlers call back to the VM)
 583       JavaThread* jt = (JavaThread*)thread;
 584       // Must always be walkable or have no last_Java_frame when in
 585       // thread_in_native
 586       jt->frame_anchor()->make_walkable(jt);
 587       jt->set_thread_state(_thread_in_native);
 588     }
 589   }
 590   notify_vm_shutdown();
 591 }
 592 
 593 void vm_shutdown()
 594 {
 595   vm_perform_shutdown_actions();
 596   os::wait_for_keypress_at_exit();
 597   os::shutdown();
 598 }
 599 
 600 void vm_abort(bool dump_core) {
 601   vm_perform_shutdown_actions();
 602   os::wait_for_keypress_at_exit();
 603   os::abort(dump_core);
 604   ShouldNotReachHere();
 605 }
 606 
 607 void vm_notify_during_shutdown(const char* error, const char* message) {
 608   if (error != NULL) {
 609     tty->print_cr("Error occurred during initialization of VM");
 610     tty->print("%s", error);
 611     if (message != NULL) {
 612       tty->print_cr(": %s", message);
 613     }
 614     else {
 615       tty->cr();
 616     }
 617   }
 618   if (ShowMessageBoxOnError && WizardMode) {
 619     fatal("Error occurred during initialization of VM");
 620   }
 621 }
 622 
 623 void vm_exit_during_initialization(Handle exception) {
 624   tty->print_cr("Error occurred during initialization of VM");
 625   // If there are exceptions on this thread it must be cleared
 626   // first and here. Any future calls to EXCEPTION_MARK requires
 627   // that no pending exceptions exist.
 628   Thread *THREAD = Thread::current();
 629   if (HAS_PENDING_EXCEPTION) {
 630     CLEAR_PENDING_EXCEPTION;
 631   }
 632   java_lang_Throwable::print(exception, tty);
 633   tty->cr();
 634   java_lang_Throwable::print_stack_trace(exception(), tty);
 635   tty->cr();
 636   vm_notify_during_shutdown(NULL, NULL);
 637 
 638   // Failure during initialization, we don't want to dump core
 639   vm_abort(false);
 640 }
 641 
 642 void vm_exit_during_initialization(Symbol* ex, const char* message) {
 643   ResourceMark rm;
 644   vm_notify_during_shutdown(ex->as_C_string(), message);
 645 
 646   // Failure during initialization, we don't want to dump core
 647   vm_abort(false);
 648 }
 649 
 650 void vm_exit_during_initialization(const char* error, const char* message) {
 651   vm_notify_during_shutdown(error, message);
 652 
 653   // Failure during initialization, we don't want to dump core
 654   vm_abort(false);
 655 }
 656 
 657 void vm_shutdown_during_initialization(const char* error, const char* message) {
 658   vm_notify_during_shutdown(error, message);
 659   vm_shutdown();
 660 }
 661 
 662 JDK_Version JDK_Version::_current;
 663 const char* JDK_Version::_runtime_name;
 664 
 665 void JDK_Version::initialize() {
 666   jdk_version_info info;
 667   assert(!_current.is_valid(), "Don't initialize twice");
 668 
 669   void *lib_handle = os::native_java_library();
 670   jdk_version_info_fn_t func = CAST_TO_FN_PTR(jdk_version_info_fn_t,
 671      os::dll_lookup(lib_handle, "JDK_GetVersionInfo0"));
 672 
 673   if (func == NULL) {
 674     // JDK older than 1.6
 675     _current._partially_initialized = true;
 676   } else {
 677     (*func)(&info, sizeof(info));
 678 
 679     int major = JDK_VERSION_MAJOR(info.jdk_version);
 680     int minor = JDK_VERSION_MINOR(info.jdk_version);
 681     int micro = JDK_VERSION_MICRO(info.jdk_version);
 682     int build = JDK_VERSION_BUILD(info.jdk_version);
 683     if (major == 1 && minor > 4) {
 684       // We represent "1.5.0" as "5.0", but 1.4.2 as itself.
 685       major = minor;
 686       minor = micro;
 687       micro = 0;
 688     }
 689     _current = JDK_Version(major, minor, micro, info.update_version,
 690                            info.special_update_version, build,
 691                            info.thread_park_blocker == 1,
 692                            info.post_vm_init_hook_enabled == 1,
 693                            info.pending_list_uses_discovered_field == 1);
 694   }
 695 }
 696 
 697 void JDK_Version::fully_initialize(
 698     uint8_t major, uint8_t minor, uint8_t micro, uint8_t update) {
 699   // This is only called when current is less than 1.6 and we've gotten
 700   // far enough in the initialization to determine the exact version.
 701   assert(major < 6, "not needed for JDK version >= 6");
 702   assert(is_partially_initialized(), "must not initialize");
 703   if (major < 5) {
 704     // JDK verison sequence: 1.2.x, 1.3.x, 1.4.x, 5.0.x, 6.0.x, etc.
 705     micro = minor;
 706     minor = major;
 707     major = 1;
 708   }
 709   _current = JDK_Version(major, minor, micro, update);
 710 }
 711 
 712 void JDK_Version_init() {
 713   JDK_Version::initialize();
 714 }
 715 
 716 static int64_t encode_jdk_version(const JDK_Version& v) {
 717   return
 718     ((int64_t)v.major_version()          << (BitsPerByte * 5)) |
 719     ((int64_t)v.minor_version()          << (BitsPerByte * 4)) |
 720     ((int64_t)v.micro_version()          << (BitsPerByte * 3)) |
 721     ((int64_t)v.update_version()         << (BitsPerByte * 2)) |
 722     ((int64_t)v.special_update_version() << (BitsPerByte * 1)) |
 723     ((int64_t)v.build_number()           << (BitsPerByte * 0));
 724 }
 725 
 726 int JDK_Version::compare(const JDK_Version& other) const {
 727   assert(is_valid() && other.is_valid(), "Invalid version (uninitialized?)");
 728   if (!is_partially_initialized() && other.is_partially_initialized()) {
 729     return -(other.compare(*this)); // flip the comparators
 730   }
 731   assert(!other.is_partially_initialized(), "Not initialized yet");
 732   if (is_partially_initialized()) {
 733     assert(other.major_version() >= 6,
 734            "Invalid JDK version comparison during initialization");
 735     return -1;
 736   } else {
 737     uint64_t e = encode_jdk_version(*this);
 738     uint64_t o = encode_jdk_version(other);
 739     return (e > o) ? 1 : ((e == o) ? 0 : -1);
 740   }
 741 }
 742 
 743 void JDK_Version::to_string(char* buffer, size_t buflen) const {
 744   size_t index = 0;
 745   if (!is_valid()) {
 746     jio_snprintf(buffer, buflen, "%s", "(uninitialized)");
 747   } else if (is_partially_initialized()) {
 748     jio_snprintf(buffer, buflen, "%s", "(uninitialized) pre-1.6.0");
 749   } else {
 750     index += jio_snprintf(
 751         &buffer[index], buflen - index, "%d.%d", _major, _minor);
 752     if (_micro > 0) {
 753       index += jio_snprintf(&buffer[index], buflen - index, ".%d", _micro);
 754     }
 755     if (_update > 0) {
 756       index += jio_snprintf(&buffer[index], buflen - index, "_%02d", _update);
 757     }
 758     if (_special > 0) {
 759       index += jio_snprintf(&buffer[index], buflen - index, "%c", _special);
 760     }
 761     if (_build > 0) {
 762       index += jio_snprintf(&buffer[index], buflen - index, "-b%02d", _build);
 763     }
 764   }
 765 }