1 /*
   2  * Copyright (c) 1997, 2016, 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 "aot/aotLoader.hpp"
  27 #include "classfile/classLoader.hpp"
  28 #include "classfile/stringTable.hpp"
  29 #include "classfile/systemDictionary.hpp"
  30 #include "code/codeCache.hpp"
  31 #include "compiler/compileBroker.hpp"
  32 #include "compiler/compilerOracle.hpp"
  33 #include "gc/shared/genCollectedHeap.hpp"
  34 #include "interpreter/bytecodeHistogram.hpp"
  35 #if INCLUDE_JVMCI
  36 #include "jvmci/jvmciCompiler.hpp"
  37 #include "jvmci/jvmciRuntime.hpp"
  38 #endif
  39 #include "logging/log.hpp"
  40 #include "memory/oopFactory.hpp"
  41 #include "memory/resourceArea.hpp"
  42 #include "memory/universe.hpp"
  43 #include "oops/constantPool.hpp"
  44 #include "oops/generateOopMap.hpp"
  45 #include "oops/instanceKlass.hpp"
  46 #include "oops/instanceOop.hpp"
  47 #include "oops/method.hpp"
  48 #include "oops/objArrayOop.hpp"
  49 #include "oops/oop.inline.hpp"
  50 #include "oops/symbol.hpp"
  51 #include "prims/jvmtiExport.hpp"
  52 #include "runtime/arguments.hpp"
  53 #include "runtime/biasedLocking.hpp"
  54 #include "runtime/compilationPolicy.hpp"
  55 #include "runtime/deoptimization.hpp"
  56 #include "runtime/fprofiler.hpp"
  57 #include "runtime/init.hpp"
  58 #include "runtime/interfaceSupport.hpp"
  59 #include "runtime/java.hpp"
  60 #include "runtime/memprofiler.hpp"
  61 #include "runtime/sharedRuntime.hpp"
  62 #include "runtime/statSampler.hpp"
  63 #include "runtime/sweeper.hpp"
  64 #include "runtime/task.hpp"
  65 #include "runtime/thread.inline.hpp"
  66 #include "runtime/timer.hpp"
  67 #include "runtime/vm_operations.hpp"
  68 #include "services/memTracker.hpp"
  69 #include "trace/traceMacros.hpp"
  70 #include "trace/tracing.hpp"
  71 #include "utilities/dtrace.hpp"
  72 #include "utilities/globalDefinitions.hpp"
  73 #include "utilities/histogram.hpp"
  74 #include "utilities/macros.hpp"
  75 #include "utilities/vmError.hpp"
  76 #if INCLUDE_ALL_GCS
  77 #include "gc/cms/concurrentMarkSweepThread.hpp"
  78 #include "gc/parallel/psScavenge.hpp"
  79 #endif // INCLUDE_ALL_GCS
  80 #ifdef COMPILER1
  81 #include "c1/c1_Compiler.hpp"
  82 #include "c1/c1_Runtime1.hpp"
  83 #endif
  84 #ifdef COMPILER2
  85 #include "code/compiledIC.hpp"
  86 #include "compiler/methodLiveness.hpp"
  87 #include "opto/compile.hpp"
  88 #include "opto/indexSet.hpp"
  89 #include "opto/runtime.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   // This HandleMark prevents a huge amount of handles from being added
 103   // to the metadata_handles() array on the thread.
 104   HandleMark hm(thread);
 105   methodHandle mh(thread, m);
 106   if ((m->method_data() != NULL) &&
 107       (PrintMethodData || CompilerOracle::should_print(mh))) {
 108     collected_profiled_methods->push(m);
 109   }
 110 }
 111 
 112 void print_method_profiling_data() {
 113   if (ProfileInterpreter COMPILER1_PRESENT(|| C1UpdateMethodData) &&
 114      (PrintMethodData || CompilerOracle::should_print_methods())) {
 115     ResourceMark rm;
 116     HandleMark hm;
 117     collected_profiled_methods = new GrowableArray<Method*>(1024);
 118     ClassLoaderDataGraph::methods_do(collect_profiled_methods);
 119     collected_profiled_methods->sort(&compare_methods);
 120 
 121     int count = collected_profiled_methods->length();
 122     int total_size = 0;
 123     if (count > 0) {
 124       for (int index = 0; index < count; index++) {
 125         Method* m = collected_profiled_methods->at(index);
 126         ttyLocker ttyl;
 127         tty->print_cr("------------------------------------------------------------------------");
 128         m->print_invocation_count();
 129         tty->print_cr("  mdo size: %d bytes", m->method_data()->size_in_bytes());
 130         tty->cr();
 131         // Dump data on parameters if any
 132         if (m->method_data() != NULL && m->method_data()->parameters_type_data() != NULL) {
 133           tty->fill_to(2);
 134           m->method_data()->parameters_type_data()->print_data_on(tty);
 135         }
 136         m->print_codes();
 137         total_size += m->method_data()->size_in_bytes();
 138       }
 139       tty->print_cr("------------------------------------------------------------------------");
 140       tty->print_cr("Total MDO size: %d bytes", total_size);
 141     }
 142   }
 143 }
 144 
 145 
 146 #ifndef PRODUCT
 147 
 148 // Statistics printing (method invocation histogram)
 149 
 150 GrowableArray<Method*>* collected_invoked_methods;
 151 
 152 void collect_invoked_methods(Method* m) {
 153   if (m->invocation_count() + m->compiled_invocation_count() >= 1 ) {
 154     collected_invoked_methods->push(m);
 155   }
 156 }
 157 
 158 
 159 
 160 
 161 void print_method_invocation_histogram() {
 162   ResourceMark rm;
 163   HandleMark hm;
 164   collected_invoked_methods = new GrowableArray<Method*>(1024);
 165   SystemDictionary::methods_do(collect_invoked_methods);
 166   collected_invoked_methods->sort(&compare_methods);
 167   //
 168   tty->cr();
 169   tty->print_cr("Histogram Over MethodOop Invocation Counters (cutoff = " INTX_FORMAT "):", MethodHistogramCutoff);
 170   tty->cr();
 171   tty->print_cr("____Count_(I+C)____Method________________________Module_________________");
 172   unsigned total = 0, int_total = 0, comp_total = 0, static_total = 0, final_total = 0,
 173       synch_total = 0, nativ_total = 0, acces_total = 0;
 174   for (int index = 0; index < collected_invoked_methods->length(); index++) {
 175     Method* m = collected_invoked_methods->at(index);
 176     int c = m->invocation_count() + m->compiled_invocation_count();
 177     if (c >= MethodHistogramCutoff) m->print_invocation_count();
 178     int_total  += m->invocation_count();
 179     comp_total += m->compiled_invocation_count();
 180     if (m->is_final())        final_total  += c;
 181     if (m->is_static())       static_total += c;
 182     if (m->is_synchronized()) synch_total  += c;
 183     if (m->is_native())       nativ_total  += c;
 184     if (m->is_accessor())     acces_total  += c;
 185   }
 186   tty->cr();
 187   total = int_total + comp_total;
 188   tty->print_cr("Invocations summary:");
 189   tty->print_cr("\t%9d (%4.1f%%) interpreted",  int_total,    100.0 * int_total    / total);
 190   tty->print_cr("\t%9d (%4.1f%%) compiled",     comp_total,   100.0 * comp_total   / total);
 191   tty->print_cr("\t%9d (100%%)  total",         total);
 192   tty->print_cr("\t%9d (%4.1f%%) synchronized", synch_total,  100.0 * synch_total  / total);
 193   tty->print_cr("\t%9d (%4.1f%%) final",        final_total,  100.0 * final_total  / total);
 194   tty->print_cr("\t%9d (%4.1f%%) static",       static_total, 100.0 * static_total / total);
 195   tty->print_cr("\t%9d (%4.1f%%) native",       nativ_total,  100.0 * nativ_total  / total);
 196   tty->print_cr("\t%9d (%4.1f%%) accessor",     acces_total,  100.0 * acces_total  / total);
 197   tty->cr();
 198   SharedRuntime::print_call_statistics(comp_total);
 199 }
 200 
 201 void print_bytecode_count() {
 202   if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
 203     tty->print_cr("[BytecodeCounter::counter_value = %d]", BytecodeCounter::counter_value());
 204   }
 205 }
 206 
 207 AllocStats alloc_stats;
 208 
 209 
 210 
 211 // General statistics printing (profiling ...)
 212 void print_statistics() {
 213 #ifdef ASSERT
 214 
 215   if (CountRuntimeCalls) {
 216     extern Histogram *RuntimeHistogram;
 217     RuntimeHistogram->print();
 218   }
 219 
 220   if (CountJNICalls) {
 221     extern Histogram *JNIHistogram;
 222     JNIHistogram->print();
 223   }
 224 
 225   if (CountJVMCalls) {
 226     extern Histogram *JVMHistogram;
 227     JVMHistogram->print();
 228   }
 229 
 230 #endif
 231 
 232   if (MemProfiling) {
 233     MemProfiler::disengage();
 234   }
 235 
 236   if (CITime) {
 237     CompileBroker::print_times();
 238   }
 239 
 240 #ifdef COMPILER1
 241   if ((PrintC1Statistics || LogVMOutput || LogCompilation) && UseCompiler) {
 242     FlagSetting fs(DisplayVMOutput, DisplayVMOutput && PrintC1Statistics);
 243     Runtime1::print_statistics();
 244     Deoptimization::print_statistics();
 245     SharedRuntime::print_statistics();
 246   }
 247 #endif /* COMPILER1 */
 248 
 249 #ifdef COMPILER2
 250   if ((PrintOptoStatistics || LogVMOutput || LogCompilation) && UseCompiler) {
 251     FlagSetting fs(DisplayVMOutput, DisplayVMOutput && PrintOptoStatistics);
 252     Compile::print_statistics();
 253 #ifndef COMPILER1
 254     Deoptimization::print_statistics();
 255     SharedRuntime::print_statistics();
 256 #endif //COMPILER1
 257     os::print_statistics();
 258   }
 259 
 260   if (PrintLockStatistics || PrintPreciseBiasedLockingStatistics || PrintPreciseRTMLockingStatistics) {
 261     OptoRuntime::print_named_counters();
 262   }
 263 
 264   if (TimeLivenessAnalysis) {
 265     MethodLiveness::print_times();
 266   }
 267 #ifdef ASSERT
 268   if (CollectIndexSetStatistics) {
 269     IndexSet::print_statistics();
 270   }
 271 #endif // ASSERT
 272 #else
 273 #ifdef INCLUDE_JVMCI
 274 #ifndef COMPILER1
 275   if ((TraceDeoptimization || LogVMOutput || LogCompilation) && UseCompiler) {
 276     FlagSetting fs(DisplayVMOutput, DisplayVMOutput && TraceDeoptimization);
 277     Deoptimization::print_statistics();
 278     SharedRuntime::print_statistics();
 279   }
 280 #endif
 281 #endif
 282 #endif
 283 
 284   if (PrintAOTStatistics) {
 285     AOTLoader::print_statistics();
 286   }
 287 
 288   if (PrintNMethodStatistics) {
 289     nmethod::print_statistics();
 290   }
 291   if (CountCompiledCalls) {
 292     print_method_invocation_histogram();
 293   }
 294 
 295   print_method_profiling_data();
 296 
 297   if (TimeCompilationPolicy) {
 298     CompilationPolicy::policy()->print_time();
 299   }
 300   if (TimeOopMap) {
 301     GenerateOopMap::print_time();
 302   }
 303   if (ProfilerCheckIntervals) {
 304     PeriodicTask::print_intervals();
 305   }
 306   if (PrintSymbolTableSizeHistogram) {
 307     SymbolTable::print_histogram();
 308   }
 309   if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
 310     BytecodeCounter::print();
 311   }
 312   if (PrintBytecodePairHistogram) {
 313     BytecodePairHistogram::print();
 314   }
 315 
 316   if (PrintCodeCache) {
 317     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 318     CodeCache::print();
 319   }
 320 
 321   if (PrintMethodFlushingStatistics) {
 322     NMethodSweeper::print();
 323   }
 324 
 325   if (PrintCodeCache2) {
 326     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 327     CodeCache::print_internals();
 328   }
 329 
 330   if (PrintVtableStats) {
 331     klassVtable::print_statistics();
 332     klassItable::print_statistics();
 333   }
 334   if (VerifyOops) {
 335     tty->print_cr("+VerifyOops count: %d", StubRoutines::verify_oop_count());
 336   }
 337 
 338   print_bytecode_count();
 339   if (PrintMallocStatistics) {
 340     tty->print("allocation stats: ");
 341     alloc_stats.print();
 342     tty->cr();
 343   }
 344 
 345   if (PrintSystemDictionaryAtExit) {
 346     SystemDictionary::print();
 347   }
 348 
 349   if (LogTouchedMethods && PrintTouchedMethodsAtExit) {
 350     Method::print_touched_methods(tty);
 351   }
 352 
 353   if (PrintBiasedLockingStatistics) {
 354     BiasedLocking::print_counters();
 355   }
 356 
 357   // Native memory tracking data
 358   if (PrintNMTStatistics) {
 359     MemTracker::final_report(tty);
 360   }
 361 }
 362 
 363 #else // PRODUCT MODE STATISTICS
 364 
 365 void print_statistics() {
 366 
 367   if (PrintMethodData) {
 368     print_method_profiling_data();
 369   }
 370 
 371   if (CITime) {
 372     CompileBroker::print_times();
 373   }
 374 
 375   if (PrintCodeCache) {
 376     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 377     CodeCache::print();
 378   }
 379 
 380   if (PrintMethodFlushingStatistics) {
 381     NMethodSweeper::print();
 382   }
 383 
 384 #ifdef COMPILER2
 385   if (PrintPreciseBiasedLockingStatistics || PrintPreciseRTMLockingStatistics) {
 386     OptoRuntime::print_named_counters();
 387   }
 388 #endif
 389   if (PrintBiasedLockingStatistics) {
 390     BiasedLocking::print_counters();
 391   }
 392 
 393   // Native memory tracking data
 394   if (PrintNMTStatistics) {
 395     MemTracker::final_report(tty);
 396   }
 397 
 398   if (LogTouchedMethods && PrintTouchedMethodsAtExit) {
 399     Method::print_touched_methods(tty);
 400   }
 401 }
 402 
 403 #endif
 404 
 405 // Note: before_exit() can be executed only once, if more than one threads
 406 //       are trying to shutdown the VM at the same time, only one thread
 407 //       can run before_exit() and all other threads must wait.
 408 void before_exit(JavaThread* thread) {
 409   #define BEFORE_EXIT_NOT_RUN 0
 410   #define BEFORE_EXIT_RUNNING 1
 411   #define BEFORE_EXIT_DONE    2
 412   static jint volatile _before_exit_status = BEFORE_EXIT_NOT_RUN;
 413 
 414   // Note: don't use a Mutex to guard the entire before_exit(), as
 415   // JVMTI post_thread_end_event and post_vm_death_event will run native code.
 416   // A CAS or OSMutex would work just fine but then we need to manipulate
 417   // thread state for Safepoint. Here we use Monitor wait() and notify_all()
 418   // for synchronization.
 419   { MutexLocker ml(BeforeExit_lock);
 420     switch (_before_exit_status) {
 421     case BEFORE_EXIT_NOT_RUN:
 422       _before_exit_status = BEFORE_EXIT_RUNNING;
 423       break;
 424     case BEFORE_EXIT_RUNNING:
 425       while (_before_exit_status == BEFORE_EXIT_RUNNING) {
 426         BeforeExit_lock->wait();
 427       }
 428       assert(_before_exit_status == BEFORE_EXIT_DONE, "invalid state");
 429       return;
 430     case BEFORE_EXIT_DONE:
 431       // need block to avoid SS compiler bug
 432       {
 433         return;
 434       }
 435     }
 436   }
 437 
 438 #if INCLUDE_JVMCI
 439   // We are not using CATCH here because we want the exit to continue normally.
 440   Thread* THREAD = thread;
 441   JVMCIRuntime::shutdown(THREAD);
 442   if (HAS_PENDING_EXCEPTION) {
 443     Handle exception(THREAD, PENDING_EXCEPTION);
 444     CLEAR_PENDING_EXCEPTION;
 445     java_lang_Throwable::java_printStackTrace(exception, THREAD);
 446   }
 447 #endif
 448 
 449   // Hang forever on exit if we're reporting an error.
 450   if (ShowMessageBoxOnError && is_error_reported()) {
 451     os::infinite_sleep();
 452   }
 453 
 454   EventThreadEnd event;
 455   if (event.should_commit()) {
 456     event.set_thread(THREAD_TRACE_ID(thread));
 457     event.commit();
 458   }
 459 
 460   TRACE_VM_EXIT();
 461 
 462   // Stop the WatcherThread. We do this before disenrolling various
 463   // PeriodicTasks to reduce the likelihood of races.
 464   if (PeriodicTask::num_tasks() > 0) {
 465     WatcherThread::stop();
 466   }
 467 
 468   // Print statistics gathered (profiling ...)
 469   if (Arguments::has_profile()) {
 470     FlatProfiler::disengage();
 471     FlatProfiler::print(10);
 472   }
 473 
 474   // shut down the StatSampler task
 475   StatSampler::disengage();
 476   StatSampler::destroy();
 477 
 478   // Stop concurrent GC threads
 479   Universe::heap()->stop();
 480 
 481   // Print GC/heap related information.
 482   Log(gc, heap, exit) log;
 483   if (log.is_info()) {
 484     ResourceMark rm;
 485     Universe::print_on(log.info_stream());
 486     if (log.is_trace()) {
 487       ClassLoaderDataGraph::dump_on(log.trace_stream());
 488     }
 489   }
 490   AdaptiveSizePolicyOutput::print();
 491 
 492   if (PrintBytecodeHistogram) {
 493     BytecodeHistogram::print();
 494   }
 495 
 496   if (JvmtiExport::should_post_thread_life()) {
 497     JvmtiExport::post_thread_end(thread);
 498   }
 499 
 500   // Always call even when there are not JVMTI environments yet, since environments
 501   // may be attached late and JVMTI must track phases of VM execution
 502   JvmtiExport::post_vm_death();
 503   Threads::shutdown_vm_agents();
 504 
 505   // Terminate the signal thread
 506   // Note: we don't wait until it actually dies.
 507   os::terminate_signal_thread();
 508 
 509   print_statistics();
 510   Universe::heap()->print_tracing_info();
 511 
 512   { MutexLocker ml(BeforeExit_lock);
 513     _before_exit_status = BEFORE_EXIT_DONE;
 514     BeforeExit_lock->notify_all();
 515   }
 516 
 517   if (VerifyStringTableAtExit) {
 518     int fail_cnt = 0;
 519     {
 520       MutexLocker ml(StringTable_lock);
 521       fail_cnt = StringTable::verify_and_compare_entries();
 522     }
 523 
 524     if (fail_cnt != 0) {
 525       tty->print_cr("ERROR: fail_cnt=%d", fail_cnt);
 526       guarantee(fail_cnt == 0, "unexpected StringTable verification failures");
 527     }
 528   }
 529 
 530   #undef BEFORE_EXIT_NOT_RUN
 531   #undef BEFORE_EXIT_RUNNING
 532   #undef BEFORE_EXIT_DONE
 533 }
 534 
 535 void vm_exit(int code) {
 536   Thread* thread =
 537       ThreadLocalStorage::is_initialized() ? Thread::current_or_null() : NULL;
 538   if (thread == NULL) {
 539     // very early initialization failure -- just exit
 540     vm_direct_exit(code);
 541   }
 542 
 543   if (VMThread::vm_thread() != NULL) {
 544     // Fire off a VM_Exit operation to bring VM to a safepoint and exit
 545     VM_Exit op(code);
 546     if (thread->is_Java_thread())
 547       ((JavaThread*)thread)->set_thread_state(_thread_in_vm);
 548     VMThread::execute(&op);
 549     // should never reach here; but in case something wrong with VM Thread.
 550     vm_direct_exit(code);
 551   } else {
 552     // VM thread is gone, just exit
 553     vm_direct_exit(code);
 554   }
 555   ShouldNotReachHere();
 556 }
 557 
 558 void notify_vm_shutdown() {
 559   // For now, just a dtrace probe.
 560   HOTSPOT_VM_SHUTDOWN();
 561   HS_DTRACE_WORKAROUND_TAIL_CALL_BUG();
 562 }
 563 
 564 void vm_direct_exit(int code) {
 565   notify_vm_shutdown();
 566   os::wait_for_keypress_at_exit();
 567   os::exit(code);
 568 }
 569 
 570 void vm_perform_shutdown_actions() {
 571   // Warning: do not call 'exit_globals()' here. All threads are still running.
 572   // Calling 'exit_globals()' will disable thread-local-storage and cause all
 573   // kinds of assertions to trigger in debug mode.
 574   if (is_init_completed()) {
 575     Thread* thread = Thread::current_or_null();
 576     if (thread != NULL && thread->is_Java_thread()) {
 577       // We are leaving the VM, set state to native (in case any OS exit
 578       // handlers call back to the VM)
 579       JavaThread* jt = (JavaThread*)thread;
 580       // Must always be walkable or have no last_Java_frame when in
 581       // thread_in_native
 582       jt->frame_anchor()->make_walkable(jt);
 583       jt->set_thread_state(_thread_in_native);
 584     }
 585   }
 586   notify_vm_shutdown();
 587 }
 588 
 589 void vm_shutdown()
 590 {
 591   vm_perform_shutdown_actions();
 592   os::wait_for_keypress_at_exit();
 593   os::shutdown();
 594 }
 595 
 596 void vm_abort(bool dump_core) {
 597   vm_perform_shutdown_actions();
 598   os::wait_for_keypress_at_exit();
 599 
 600   // Flush stdout and stderr before abort.
 601   fflush(stdout);
 602   fflush(stderr);
 603 
 604   os::abort(dump_core);
 605   ShouldNotReachHere();
 606 }
 607 
 608 void vm_notify_during_shutdown(const char* error, const char* message) {
 609   if (error != NULL) {
 610     tty->print_cr("Error occurred during initialization of VM");
 611     tty->print("%s", error);
 612     if (message != NULL) {
 613       tty->print_cr(": %s", message);
 614     }
 615     else {
 616       tty->cr();
 617     }
 618   }
 619   if (ShowMessageBoxOnError && WizardMode) {
 620     fatal("Error occurred during initialization of VM");
 621   }
 622 }
 623 
 624 void vm_exit_during_initialization(Handle exception) {
 625   tty->print_cr("Error occurred during initialization of VM");
 626   // If there are exceptions on this thread it must be cleared
 627   // first and here. Any future calls to EXCEPTION_MARK requires
 628   // that no pending exceptions exist.
 629   Thread *THREAD = Thread::current(); // can't be NULL
 630   if (HAS_PENDING_EXCEPTION) {
 631     CLEAR_PENDING_EXCEPTION;
 632   }
 633   java_lang_Throwable::print_stack_trace(exception, tty);
 634   tty->cr();
 635   vm_notify_during_shutdown(NULL, NULL);
 636 
 637   // Failure during initialization, we don't want to dump core
 638   vm_abort(false);
 639 }
 640 
 641 void vm_exit_during_initialization(Symbol* ex, const char* message) {
 642   ResourceMark rm;
 643   vm_notify_during_shutdown(ex->as_C_string(), message);
 644 
 645   // Failure during initialization, we don't want to dump core
 646   vm_abort(false);
 647 }
 648 
 649 void vm_exit_during_initialization(const char* error, const char* message) {
 650   vm_notify_during_shutdown(error, message);
 651 
 652   // Failure during initialization, we don't want to dump core
 653   vm_abort(false);
 654 }
 655 
 656 void vm_shutdown_during_initialization(const char* error, const char* message) {
 657   vm_notify_during_shutdown(error, message);
 658   vm_shutdown();
 659 }
 660 
 661 JDK_Version JDK_Version::_current;
 662 const char* JDK_Version::_runtime_name;
 663 const char* JDK_Version::_runtime_version;
 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   assert(func != NULL, "Support for JDK 1.5 or older has been removed after JEP-223");
 674 
 675   (*func)(&info, sizeof(info));
 676 
 677   int major = JDK_VERSION_MAJOR(info.jdk_version);
 678   int minor = JDK_VERSION_MINOR(info.jdk_version);
 679   int security = JDK_VERSION_SECURITY(info.jdk_version);
 680   int build = JDK_VERSION_BUILD(info.jdk_version);
 681 
 682   // Incompatible with pre-4243978 JDK.
 683   if (info.pending_list_uses_discovered_field == 0) {
 684     vm_exit_during_initialization(
 685       "Incompatible JDK is not using Reference.discovered field for pending list");
 686   }
 687   _current = JDK_Version(major, minor, security, info.patch_version, build,
 688                          info.thread_park_blocker == 1,
 689                          info.post_vm_init_hook_enabled == 1);
 690 }
 691 
 692 void JDK_Version_init() {
 693   JDK_Version::initialize();
 694 }
 695 
 696 static int64_t encode_jdk_version(const JDK_Version& v) {
 697   return
 698     ((int64_t)v.major_version()          << (BitsPerByte * 4)) |
 699     ((int64_t)v.minor_version()          << (BitsPerByte * 3)) |
 700     ((int64_t)v.security_version()       << (BitsPerByte * 2)) |
 701     ((int64_t)v.patch_version()          << (BitsPerByte * 1)) |
 702     ((int64_t)v.build_number()           << (BitsPerByte * 0));
 703 }
 704 
 705 int JDK_Version::compare(const JDK_Version& other) const {
 706   assert(is_valid() && other.is_valid(), "Invalid version (uninitialized?)");
 707   uint64_t e = encode_jdk_version(*this);
 708   uint64_t o = encode_jdk_version(other);
 709   return (e > o) ? 1 : ((e == o) ? 0 : -1);
 710 }
 711 
 712 void JDK_Version::to_string(char* buffer, size_t buflen) const {
 713   assert(buffer && buflen > 0, "call with useful buffer");
 714   size_t index = 0;
 715 
 716   if (!is_valid()) {
 717     jio_snprintf(buffer, buflen, "%s", "(uninitialized)");
 718   } else {
 719     int rc = jio_snprintf(
 720         &buffer[index], buflen - index, "%d.%d", _major, _minor);
 721     if (rc == -1) return;
 722     index += rc;
 723     if (_security > 0) {
 724       rc = jio_snprintf(&buffer[index], buflen - index, ".%d", _security);
 725     }
 726     if (_patch > 0) {
 727       rc = jio_snprintf(&buffer[index], buflen - index, ".%d", _patch);
 728       if (rc == -1) return;
 729       index += rc;
 730     }
 731     if (_build > 0) {
 732       rc = jio_snprintf(&buffer[index], buflen - index, "+%d", _build);
 733       if (rc == -1) return;
 734       index += rc;
 735     }
 736   }
 737 }