1 /*
   2  * Copyright (c) 1997, 2018, 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 "jvm.h"
  27 #include "aot/aotLoader.hpp"
  28 #include "classfile/classLoader.hpp"
  29 #include "classfile/stringTable.hpp"
  30 #include "classfile/systemDictionary.hpp"
  31 #include "code/codeCache.hpp"
  32 #include "compiler/compileBroker.hpp"
  33 #include "compiler/compilerOracle.hpp"
  34 #include "interpreter/bytecodeHistogram.hpp"
  35 #include "jfr/jfrEvents.hpp"
  36 #include "jfr/support/jfrThreadId.hpp"
  37 #if INCLUDE_JVMCI
  38 #include "jvmci/jvmciCompiler.hpp"
  39 #include "jvmci/jvmciRuntime.hpp"
  40 #endif
  41 #include "logging/log.hpp"
  42 #include "logging/logStream.hpp"
  43 #include "memory/oopFactory.hpp"
  44 #include "memory/resourceArea.hpp"
  45 #include "memory/universe.hpp"
  46 #include "oops/constantPool.hpp"
  47 #include "oops/generateOopMap.hpp"
  48 #include "oops/instanceKlass.hpp"
  49 #include "oops/instanceOop.hpp"
  50 #include "oops/method.hpp"
  51 #include "oops/objArrayOop.hpp"
  52 #include "oops/oop.inline.hpp"
  53 #include "oops/symbol.hpp"
  54 #include "prims/jvmtiExport.hpp"
  55 #include "runtime/arguments.hpp"
  56 #include "runtime/biasedLocking.hpp"
  57 #include "runtime/compilationPolicy.hpp"
  58 #include "runtime/deoptimization.hpp"
  59 #include "runtime/flags/flagSetting.hpp"
  60 #include "runtime/init.hpp"
  61 #include "runtime/interfaceSupport.inline.hpp"
  62 #include "runtime/java.hpp"
  63 #include "runtime/memprofiler.hpp"
  64 #include "runtime/sharedRuntime.hpp"
  65 #include "runtime/statSampler.hpp"
  66 #include "runtime/sweeper.hpp"
  67 #include "runtime/task.hpp"
  68 #include "runtime/thread.inline.hpp"
  69 #include "runtime/timer.hpp"
  70 #include "runtime/vmOperations.hpp"
  71 #include "services/memTracker.hpp"
  72 #include "utilities/dtrace.hpp"
  73 #include "utilities/globalDefinitions.hpp"
  74 #include "utilities/histogram.hpp"
  75 #include "utilities/macros.hpp"
  76 #include "utilities/vmError.hpp"
  77 #ifdef COMPILER1
  78 #include "c1/c1_Compiler.hpp"
  79 #include "c1/c1_Runtime1.hpp"
  80 #endif
  81 #ifdef COMPILER2
  82 #include "code/compiledIC.hpp"
  83 #include "compiler/methodLiveness.hpp"
  84 #include "opto/compile.hpp"
  85 #include "opto/indexSet.hpp"
  86 #include "opto/runtime.hpp"
  87 #endif
  88 #if INCLUDE_JFR
  89 #include "jfr/jfr.hpp"
  90 #endif
  91 
  92 GrowableArray<Method*>* collected_profiled_methods;
  93 
  94 int compare_methods(Method** a, Method** b) {
  95   // %%% there can be 32-bit overflow here
  96   return ((*b)->invocation_count() + (*b)->compiled_invocation_count())
  97        - ((*a)->invocation_count() + (*a)->compiled_invocation_count());
  98 }
  99 
 100 void collect_profiled_methods(Method* m) {
 101   Thread* thread = Thread::current();
 102   methodHandle mh(thread, m);
 103   if ((m->method_data() != NULL) &&
 104       (PrintMethodData || CompilerOracle::should_print(mh))) {
 105     collected_profiled_methods->push(m);
 106   }
 107 }
 108 
 109 void print_method_profiling_data() {
 110   if (ProfileInterpreter COMPILER1_PRESENT(|| C1UpdateMethodData) &&
 111      (PrintMethodData || CompilerOracle::should_print_methods())) {
 112     ResourceMark rm;
 113     HandleMark hm;
 114     collected_profiled_methods = new GrowableArray<Method*>(1024);
 115     SystemDictionary::methods_do(collect_profiled_methods);
 116     collected_profiled_methods->sort(&compare_methods);
 117 
 118     int count = collected_profiled_methods->length();
 119     int total_size = 0;
 120     if (count > 0) {
 121       for (int index = 0; index < count; index++) {
 122         Method* m = collected_profiled_methods->at(index);
 123         ttyLocker ttyl;
 124         tty->print_cr("------------------------------------------------------------------------");
 125         m->print_invocation_count();
 126         tty->print_cr("  mdo size: %d bytes", m->method_data()->size_in_bytes());
 127         tty->cr();
 128         // Dump data on parameters if any
 129         if (m->method_data() != NULL && m->method_data()->parameters_type_data() != NULL) {
 130           tty->fill_to(2);
 131           m->method_data()->parameters_type_data()->print_data_on(tty);
 132         }
 133         m->print_codes();
 134         total_size += m->method_data()->size_in_bytes();
 135       }
 136       tty->print_cr("------------------------------------------------------------------------");
 137       tty->print_cr("Total MDO size: %d bytes", total_size);
 138     }
 139   }
 140 }
 141 
 142 
 143 #ifndef PRODUCT
 144 
 145 // Statistics printing (method invocation histogram)
 146 
 147 GrowableArray<Method*>* collected_invoked_methods;
 148 
 149 void collect_invoked_methods(Method* m) {
 150   if (m->invocation_count() + m->compiled_invocation_count() >= 1 ) {
 151     collected_invoked_methods->push(m);
 152   }
 153 }
 154 
 155 
 156 
 157 
 158 void print_method_invocation_histogram() {
 159   ResourceMark rm;
 160   HandleMark hm;
 161   collected_invoked_methods = new GrowableArray<Method*>(1024);
 162   SystemDictionary::methods_do(collect_invoked_methods);
 163   collected_invoked_methods->sort(&compare_methods);
 164   //
 165   tty->cr();
 166   tty->print_cr("Histogram Over Method Invocation Counters (cutoff = " INTX_FORMAT "):", MethodHistogramCutoff);
 167   tty->cr();
 168   tty->print_cr("____Count_(I+C)____Method________________________Module_________________");
 169   unsigned total = 0, int_total = 0, comp_total = 0, static_total = 0, final_total = 0,
 170       synch_total = 0, nativ_total = 0, acces_total = 0;
 171   for (int index = 0; index < collected_invoked_methods->length(); index++) {
 172     Method* m = collected_invoked_methods->at(index);
 173     int c = m->invocation_count() + m->compiled_invocation_count();
 174     if (c >= MethodHistogramCutoff) m->print_invocation_count();
 175     int_total  += m->invocation_count();
 176     comp_total += m->compiled_invocation_count();
 177     if (m->is_final())        final_total  += c;
 178     if (m->is_static())       static_total += c;
 179     if (m->is_synchronized()) synch_total  += c;
 180     if (m->is_native())       nativ_total  += c;
 181     if (m->is_accessor())     acces_total  += c;
 182   }
 183   tty->cr();
 184   total = int_total + comp_total;
 185   tty->print_cr("Invocations summary:");
 186   tty->print_cr("\t%9d (%4.1f%%) interpreted",  int_total,    100.0 * int_total    / total);
 187   tty->print_cr("\t%9d (%4.1f%%) compiled",     comp_total,   100.0 * comp_total   / total);
 188   tty->print_cr("\t%9d (100%%)  total",         total);
 189   tty->print_cr("\t%9d (%4.1f%%) synchronized", synch_total,  100.0 * synch_total  / total);
 190   tty->print_cr("\t%9d (%4.1f%%) final",        final_total,  100.0 * final_total  / total);
 191   tty->print_cr("\t%9d (%4.1f%%) static",       static_total, 100.0 * static_total / total);
 192   tty->print_cr("\t%9d (%4.1f%%) native",       nativ_total,  100.0 * nativ_total  / total);
 193   tty->print_cr("\t%9d (%4.1f%%) accessor",     acces_total,  100.0 * acces_total  / total);
 194   tty->cr();
 195   SharedRuntime::print_call_statistics(comp_total);
 196 }
 197 
 198 void print_bytecode_count() {
 199   if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
 200     tty->print_cr("[BytecodeCounter::counter_value = %d]", BytecodeCounter::counter_value());
 201   }
 202 }
 203 
 204 AllocStats alloc_stats;
 205 
 206 
 207 
 208 // General statistics printing (profiling ...)
 209 void print_statistics() {
 210 #ifdef ASSERT
 211 
 212   if (CountRuntimeCalls) {
 213     extern Histogram *RuntimeHistogram;
 214     RuntimeHistogram->print();
 215   }
 216 
 217   if (CountJNICalls) {
 218     extern Histogram *JNIHistogram;
 219     JNIHistogram->print();
 220   }
 221 
 222   if (CountJVMCalls) {
 223     extern Histogram *JVMHistogram;
 224     JVMHistogram->print();
 225   }
 226 
 227 #endif
 228 
 229   if (MemProfiling) {
 230     MemProfiler::disengage();
 231   }
 232 
 233   if (CITime) {
 234     CompileBroker::print_times();
 235   }
 236 
 237 #ifdef COMPILER1
 238   if ((PrintC1Statistics || LogVMOutput || LogCompilation) && UseCompiler) {
 239     FlagSetting fs(DisplayVMOutput, DisplayVMOutput && PrintC1Statistics);
 240     Runtime1::print_statistics();
 241     Deoptimization::print_statistics();
 242     SharedRuntime::print_statistics();
 243   }
 244 #endif /* COMPILER1 */
 245 
 246 #ifdef COMPILER2
 247   if ((PrintOptoStatistics || LogVMOutput || LogCompilation) && UseCompiler) {
 248     FlagSetting fs(DisplayVMOutput, DisplayVMOutput && PrintOptoStatistics);
 249     Compile::print_statistics();
 250 #ifndef COMPILER1
 251     Deoptimization::print_statistics();
 252     SharedRuntime::print_statistics();
 253 #endif //COMPILER1
 254     os::print_statistics();
 255   }
 256 
 257   if (PrintLockStatistics || PrintPreciseBiasedLockingStatistics || PrintPreciseRTMLockingStatistics) {
 258     OptoRuntime::print_named_counters();
 259   }
 260 
 261   if (TimeLivenessAnalysis) {
 262     MethodLiveness::print_times();
 263   }
 264 #ifdef ASSERT
 265   if (CollectIndexSetStatistics) {
 266     IndexSet::print_statistics();
 267   }
 268 #endif // ASSERT
 269 #else // COMPILER2
 270 #if INCLUDE_JVMCI
 271 #ifndef COMPILER1
 272   if ((TraceDeoptimization || LogVMOutput || LogCompilation) && UseCompiler) {
 273     FlagSetting fs(DisplayVMOutput, DisplayVMOutput && TraceDeoptimization);
 274     Deoptimization::print_statistics();
 275     SharedRuntime::print_statistics();
 276   }
 277 #endif // COMPILER1
 278 #endif // INCLUDE_JVMCI
 279 #endif // COMPILER2
 280 
 281   if (PrintAOTStatistics) {
 282     AOTLoader::print_statistics();
 283   }
 284 
 285   if (PrintNMethodStatistics) {
 286     nmethod::print_statistics();
 287   }
 288   if (CountCompiledCalls) {
 289     print_method_invocation_histogram();
 290   }
 291 
 292   print_method_profiling_data();
 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   // CodeHeap State Analytics.
 319   // Does also call NMethodSweeper::print(tty)
 320   if (PrintCodeHeapAnalytics) {
 321     CompileBroker::print_heapinfo(NULL, "all", 4096); // details
 322   } else if (PrintMethodFlushingStatistics) {
 323     NMethodSweeper::print(tty);
 324   }
 325 
 326   if (PrintCodeCache2) {
 327     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 328     CodeCache::print_internals();
 329   }
 330 
 331   if (PrintVtableStats) {
 332     klassVtable::print_statistics();
 333     klassItable::print_statistics();
 334   }
 335   if (VerifyOops && Verbose) {
 336     tty->print_cr("+VerifyOops count: %d", StubRoutines::verify_oop_count());
 337   }
 338 
 339   print_bytecode_count();
 340   if (PrintMallocStatistics) {
 341     tty->print("allocation stats: ");
 342     alloc_stats.print();
 343     tty->cr();
 344   }
 345 
 346   if (PrintSystemDictionaryAtExit) {
 347     ResourceMark rm;
 348     SystemDictionary::print();
 349     ClassLoaderDataGraph::print();
 350   }
 351 
 352   if (LogTouchedMethods && PrintTouchedMethodsAtExit) {
 353     Method::print_touched_methods(tty);
 354   }
 355 
 356   if (PrintBiasedLockingStatistics) {
 357     BiasedLocking::print_counters();
 358   }
 359 
 360   // Native memory tracking data
 361   if (PrintNMTStatistics) {
 362     MemTracker::final_report(tty);
 363   }
 364 
 365   ThreadsSMRSupport::log_statistics();
 366 }
 367 
 368 #else // PRODUCT MODE STATISTICS
 369 
 370 void print_statistics() {
 371 
 372   if (PrintMethodData) {
 373     print_method_profiling_data();
 374   }
 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   // CodeHeap State Analytics.
 386   // Does also call NMethodSweeper::print(tty)
 387   if (PrintCodeHeapAnalytics) {
 388     CompileBroker::print_heapinfo(NULL, "all", 4096); // details
 389   } else if (PrintMethodFlushingStatistics) {
 390     NMethodSweeper::print(tty);
 391   }
 392 
 393 #ifdef COMPILER2
 394   if (PrintPreciseBiasedLockingStatistics || PrintPreciseRTMLockingStatistics) {
 395     OptoRuntime::print_named_counters();
 396   }
 397 #endif
 398   if (PrintBiasedLockingStatistics) {
 399     BiasedLocking::print_counters();
 400   }
 401 
 402   // Native memory tracking data
 403   if (PrintNMTStatistics) {
 404     MemTracker::final_report(tty);
 405   }
 406 
 407   if (LogTouchedMethods && PrintTouchedMethodsAtExit) {
 408     Method::print_touched_methods(tty);
 409   }
 410 
 411   ThreadsSMRSupport::log_statistics();
 412 }
 413 
 414 #endif
 415 
 416 // Note: before_exit() can be executed only once, if more than one threads
 417 //       are trying to shutdown the VM at the same time, only one thread
 418 //       can run before_exit() and all other threads must wait.
 419 void before_exit(JavaThread* thread) {
 420   #define BEFORE_EXIT_NOT_RUN 0
 421   #define BEFORE_EXIT_RUNNING 1
 422   #define BEFORE_EXIT_DONE    2
 423   static jint volatile _before_exit_status = BEFORE_EXIT_NOT_RUN;
 424 
 425   // Note: don't use a Mutex to guard the entire before_exit(), as
 426   // JVMTI post_thread_end_event and post_vm_death_event will run native code.
 427   // A CAS or OSMutex would work just fine but then we need to manipulate
 428   // thread state for Safepoint. Here we use Monitor wait() and notify_all()
 429   // for synchronization.
 430   { MutexLocker ml(BeforeExit_lock);
 431     switch (_before_exit_status) {
 432     case BEFORE_EXIT_NOT_RUN:
 433       _before_exit_status = BEFORE_EXIT_RUNNING;
 434       break;
 435     case BEFORE_EXIT_RUNNING:
 436       while (_before_exit_status == BEFORE_EXIT_RUNNING) {
 437         BeforeExit_lock->wait();
 438       }
 439       assert(_before_exit_status == BEFORE_EXIT_DONE, "invalid state");
 440       return;
 441     case BEFORE_EXIT_DONE:
 442       // need block to avoid SS compiler bug
 443       {
 444         return;
 445       }
 446     }
 447   }
 448 
 449 #if INCLUDE_JVMCI
 450   // We are not using CATCH here because we want the exit to continue normally.
 451   Thread* THREAD = thread;
 452   JVMCIRuntime::shutdown(THREAD);
 453   if (HAS_PENDING_EXCEPTION) {
 454     HandleMark hm(THREAD);
 455     Handle exception(THREAD, PENDING_EXCEPTION);
 456     CLEAR_PENDING_EXCEPTION;
 457     java_lang_Throwable::java_printStackTrace(exception, THREAD);
 458   }
 459 #endif
 460 
 461   // Hang forever on exit if we're reporting an error.
 462   if (ShowMessageBoxOnError && VMError::is_error_reported()) {
 463     os::infinite_sleep();
 464   }
 465 
 466   EventThreadEnd event;
 467   if (event.should_commit()) {
 468     event.set_thread(JFR_THREAD_ID(thread));
 469     event.commit();
 470   }
 471 
 472   JFR_ONLY(Jfr::on_vm_shutdown();)
 473 
 474   // Stop the WatcherThread. We do this before disenrolling various
 475   // PeriodicTasks to reduce the likelihood of races.
 476   if (PeriodicTask::num_tasks() > 0) {
 477     WatcherThread::stop();
 478   }
 479 
 480   // shut down the StatSampler task
 481   StatSampler::disengage();
 482   StatSampler::destroy();
 483 
 484   // Stop concurrent GC threads
 485   Universe::heap()->stop();
 486 
 487   // Print GC/heap related information.
 488   Log(gc, heap, exit) log;
 489   if (log.is_info()) {
 490     ResourceMark rm;
 491     LogStream ls_info(log.info());
 492     Universe::print_on(&ls_info);
 493     if (log.is_trace()) {
 494       LogStream ls_trace(log.trace());
 495       ClassLoaderDataGraph::print_on(&ls_trace);
 496     }
 497   }
 498 
 499   if (PrintBytecodeHistogram) {
 500     BytecodeHistogram::print();
 501   }
 502 
 503   if (JvmtiExport::should_post_thread_life()) {
 504     JvmtiExport::post_thread_end(thread);
 505   }
 506 
 507   // Always call even when there are not JVMTI environments yet, since environments
 508   // may be attached late and JVMTI must track phases of VM execution
 509   JvmtiExport::post_vm_death();
 510   Threads::shutdown_vm_agents();
 511 
 512   // Terminate the signal thread
 513   // Note: we don't wait until it actually dies.
 514   os::terminate_signal_thread();
 515 
 516   print_statistics();
 517   Universe::heap()->print_tracing_info();
 518 
 519   { MutexLocker ml(BeforeExit_lock);
 520     _before_exit_status = BEFORE_EXIT_DONE;
 521     BeforeExit_lock->notify_all();
 522   }
 523 
 524   if (VerifyStringTableAtExit) {
 525     size_t fail_cnt = StringTable::verify_and_compare_entries();
 526     if (fail_cnt != 0) {
 527       tty->print_cr("ERROR: fail_cnt=" SIZE_FORMAT, fail_cnt);
 528       guarantee(fail_cnt == 0, "unexpected StringTable verification failures");
 529     }
 530   }
 531 
 532   #undef BEFORE_EXIT_NOT_RUN
 533   #undef BEFORE_EXIT_RUNNING
 534   #undef BEFORE_EXIT_DONE
 535 }
 536 
 537 void vm_exit(int code) {
 538   Thread* thread =
 539       ThreadLocalStorage::is_initialized() ? Thread::current_or_null() : NULL;
 540   if (thread == NULL) {
 541     // very early initialization failure -- just exit
 542     vm_direct_exit(code);
 543   }
 544 
 545   if (VMThread::vm_thread() != NULL) {
 546     // Fire off a VM_Exit operation to bring VM to a safepoint and exit
 547     VM_Exit op(code);
 548     if (thread->is_Java_thread())
 549       ((JavaThread*)thread)->set_thread_state(_thread_in_vm);
 550     VMThread::execute(&op);
 551     // should never reach here; but in case something wrong with VM Thread.
 552     vm_direct_exit(code);
 553   } else {
 554     // VM thread is gone, just exit
 555     vm_direct_exit(code);
 556   }
 557   ShouldNotReachHere();
 558 }
 559 
 560 void notify_vm_shutdown() {
 561   // For now, just a dtrace probe.
 562   HOTSPOT_VM_SHUTDOWN();
 563   HS_DTRACE_WORKAROUND_TAIL_CALL_BUG();
 564 }
 565 
 566 void vm_direct_exit(int code) {
 567   notify_vm_shutdown();
 568   os::wait_for_keypress_at_exit();
 569   os::exit(code);
 570 }
 571 
 572 void vm_perform_shutdown_actions() {
 573   if (is_init_completed()) {
 574     Thread* thread = Thread::current_or_null();
 575     if (thread != NULL && thread->is_Java_thread()) {
 576       // We are leaving the VM, set state to native (in case any OS exit
 577       // handlers call back to the VM)
 578       JavaThread* jt = (JavaThread*)thread;
 579       // Must always be walkable or have no last_Java_frame when in
 580       // thread_in_native
 581       jt->frame_anchor()->make_walkable(jt);
 582       jt->set_thread_state(_thread_in_native);
 583     }
 584   }
 585   notify_vm_shutdown();
 586 }
 587 
 588 void vm_shutdown()
 589 {
 590   vm_perform_shutdown_actions();
 591   os::wait_for_keypress_at_exit();
 592   os::shutdown();
 593 }
 594 
 595 void vm_abort(bool dump_core) {
 596   vm_perform_shutdown_actions();
 597   os::wait_for_keypress_at_exit();
 598 
 599   // Flush stdout and stderr before abort.
 600   fflush(stdout);
 601   fflush(stderr);
 602 
 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() {
 624   vm_notify_during_shutdown(NULL, NULL);
 625 
 626   // Failure during initialization, we don't want to dump core
 627   vm_abort(false);
 628 }
 629 
 630 void vm_exit_during_initialization(Handle exception) {
 631   tty->print_cr("Error occurred during initialization of VM");
 632   // If there are exceptions on this thread it must be cleared
 633   // first and here. Any future calls to EXCEPTION_MARK requires
 634   // that no pending exceptions exist.
 635   Thread *THREAD = Thread::current(); // can't be NULL
 636   if (HAS_PENDING_EXCEPTION) {
 637     CLEAR_PENDING_EXCEPTION;
 638   }
 639   java_lang_Throwable::print_stack_trace(exception, tty);
 640   tty->cr();
 641   vm_notify_during_shutdown(NULL, NULL);
 642 
 643   // Failure during initialization, we don't want to dump core
 644   vm_abort(false);
 645 }
 646 
 647 void vm_exit_during_initialization(Symbol* ex, const char* message) {
 648   ResourceMark rm;
 649   vm_notify_during_shutdown(ex->as_C_string(), message);
 650 
 651   // Failure during initialization, we don't want to dump core
 652   vm_abort(false);
 653 }
 654 
 655 void vm_exit_during_initialization(const char* error, const char* message) {
 656   vm_notify_during_shutdown(error, message);
 657 
 658   // Failure during initialization, we don't want to dump core
 659   vm_abort(false);
 660 }
 661 
 662 void vm_shutdown_during_initialization(const char* error, const char* message) {
 663   vm_notify_during_shutdown(error, message);
 664   vm_shutdown();
 665 }
 666 
 667 JDK_Version JDK_Version::_current;
 668 const char* JDK_Version::_runtime_name;
 669 const char* JDK_Version::_runtime_version;
 670 const char* JDK_Version::_runtime_vendor_version;
 671 const char* JDK_Version::_runtime_vendor_vm_bug_url;
 672 
 673 void JDK_Version::initialize() {
 674   jdk_version_info info;
 675   assert(!_current.is_valid(), "Don't initialize twice");
 676 
 677   void *lib_handle = os::native_java_library();
 678   jdk_version_info_fn_t func = CAST_TO_FN_PTR(jdk_version_info_fn_t,
 679      os::dll_lookup(lib_handle, "JDK_GetVersionInfo0"));
 680 
 681   assert(func != NULL, "Support for JDK 1.5 or older has been removed after JEP-223");
 682 
 683   (*func)(&info, sizeof(info));
 684 
 685   int major = JDK_VERSION_MAJOR(info.jdk_version);
 686   int minor = JDK_VERSION_MINOR(info.jdk_version);
 687   int security = JDK_VERSION_SECURITY(info.jdk_version);
 688   int build = JDK_VERSION_BUILD(info.jdk_version);
 689 
 690   // Incompatible with pre-4243978 JDK.
 691   if (info.pending_list_uses_discovered_field == 0) {
 692     vm_exit_during_initialization(
 693       "Incompatible JDK is not using Reference.discovered field for pending list");
 694   }
 695   _current = JDK_Version(major, minor, security, info.patch_version, build,
 696                          info.thread_park_blocker == 1,
 697                          info.post_vm_init_hook_enabled == 1);
 698 }
 699 
 700 void JDK_Version_init() {
 701   JDK_Version::initialize();
 702 }
 703 
 704 static int64_t encode_jdk_version(const JDK_Version& v) {
 705   return
 706     ((int64_t)v.major_version()          << (BitsPerByte * 4)) |
 707     ((int64_t)v.minor_version()          << (BitsPerByte * 3)) |
 708     ((int64_t)v.security_version()       << (BitsPerByte * 2)) |
 709     ((int64_t)v.patch_version()          << (BitsPerByte * 1)) |
 710     ((int64_t)v.build_number()           << (BitsPerByte * 0));
 711 }
 712 
 713 int JDK_Version::compare(const JDK_Version& other) const {
 714   assert(is_valid() && other.is_valid(), "Invalid version (uninitialized?)");
 715   uint64_t e = encode_jdk_version(*this);
 716   uint64_t o = encode_jdk_version(other);
 717   return (e > o) ? 1 : ((e == o) ? 0 : -1);
 718 }
 719 
 720 void JDK_Version::to_string(char* buffer, size_t buflen) const {
 721   assert(buffer && buflen > 0, "call with useful buffer");
 722   size_t index = 0;
 723 
 724   if (!is_valid()) {
 725     jio_snprintf(buffer, buflen, "%s", "(uninitialized)");
 726   } else {
 727     int rc = jio_snprintf(
 728         &buffer[index], buflen - index, "%d.%d", _major, _minor);
 729     if (rc == -1) return;
 730     index += rc;
 731     if (_security > 0) {
 732       rc = jio_snprintf(&buffer[index], buflen - index, ".%d", _security);
 733       if (rc == -1) return;
 734       index += rc;
 735     }
 736     if (_patch > 0) {
 737       rc = jio_snprintf(&buffer[index], buflen - index, ".%d", _patch);
 738       if (rc == -1) return;
 739       index += rc;
 740     }
 741     if (_build > 0) {
 742       rc = jio_snprintf(&buffer[index], buflen - index, "+%d", _build);
 743       if (rc == -1) return;
 744       index += rc;
 745     }
 746   }
 747 }