1 /*
   2  * Copyright (c) 1997, 2017, 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   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
 270 #ifdef 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
 278 #endif
 279 #endif
 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   if (PrintMethodFlushingStatistics) {
 319     NMethodSweeper::print();
 320   }
 321 
 322   if (PrintCodeCache2) {
 323     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 324     CodeCache::print_internals();
 325   }
 326 
 327   if (PrintVtableStats) {
 328     klassVtable::print_statistics();
 329     klassItable::print_statistics();
 330   }
 331   if (VerifyOops) {
 332     tty->print_cr("+VerifyOops count: %d", StubRoutines::verify_oop_count());
 333   }
 334 
 335   print_bytecode_count();
 336   if (PrintMallocStatistics) {
 337     tty->print("allocation stats: ");
 338     alloc_stats.print();
 339     tty->cr();
 340   }
 341 
 342   if (PrintSystemDictionaryAtExit) {
 343     SystemDictionary::print();
 344   }
 345 
 346   if (LogTouchedMethods && PrintTouchedMethodsAtExit) {
 347     Method::print_touched_methods(tty);
 348   }
 349 
 350   if (PrintBiasedLockingStatistics) {
 351     BiasedLocking::print_counters();
 352   }
 353 
 354   // Native memory tracking data
 355   if (PrintNMTStatistics) {
 356     MemTracker::final_report(tty);
 357   }
 358 }
 359 
 360 #else // PRODUCT MODE STATISTICS
 361 
 362 void print_statistics() {
 363 
 364   if (PrintMethodData) {
 365     print_method_profiling_data();
 366   }
 367 
 368   if (CITime) {
 369     CompileBroker::print_times();
 370   }
 371 
 372   if (PrintCodeCache) {
 373     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 374     CodeCache::print();
 375   }
 376 
 377   if (PrintMethodFlushingStatistics) {
 378     NMethodSweeper::print();
 379   }
 380 
 381 #ifdef COMPILER2
 382   if (PrintPreciseBiasedLockingStatistics || PrintPreciseRTMLockingStatistics) {
 383     OptoRuntime::print_named_counters();
 384   }
 385 #endif
 386   if (PrintBiasedLockingStatistics) {
 387     BiasedLocking::print_counters();
 388   }
 389 
 390   // Native memory tracking data
 391   if (PrintNMTStatistics) {
 392     MemTracker::final_report(tty);
 393   }
 394 
 395   if (LogTouchedMethods && PrintTouchedMethodsAtExit) {
 396     Method::print_touched_methods(tty);
 397   }
 398 }
 399 
 400 #endif
 401 
 402 // Note: before_exit() can be executed only once, if more than one threads
 403 //       are trying to shutdown the VM at the same time, only one thread
 404 //       can run before_exit() and all other threads must wait.
 405 void before_exit(JavaThread* thread) {
 406   #define BEFORE_EXIT_NOT_RUN 0
 407   #define BEFORE_EXIT_RUNNING 1
 408   #define BEFORE_EXIT_DONE    2
 409   static jint volatile _before_exit_status = BEFORE_EXIT_NOT_RUN;
 410 
 411   // Note: don't use a Mutex to guard the entire before_exit(), as
 412   // JVMTI post_thread_end_event and post_vm_death_event will run native code.
 413   // A CAS or OSMutex would work just fine but then we need to manipulate
 414   // thread state for Safepoint. Here we use Monitor wait() and notify_all()
 415   // for synchronization.
 416   { MutexLocker ml(BeforeExit_lock);
 417     switch (_before_exit_status) {
 418     case BEFORE_EXIT_NOT_RUN:
 419       _before_exit_status = BEFORE_EXIT_RUNNING;
 420       break;
 421     case BEFORE_EXIT_RUNNING:
 422       while (_before_exit_status == BEFORE_EXIT_RUNNING) {
 423         BeforeExit_lock->wait();
 424       }
 425       assert(_before_exit_status == BEFORE_EXIT_DONE, "invalid state");
 426       return;
 427     case BEFORE_EXIT_DONE:
 428       // need block to avoid SS compiler bug
 429       {
 430         return;
 431       }
 432     }
 433   }
 434 
 435 #if INCLUDE_JVMCI
 436   // We are not using CATCH here because we want the exit to continue normally.
 437   Thread* THREAD = thread;
 438   JVMCIRuntime::shutdown(THREAD);
 439   if (HAS_PENDING_EXCEPTION) {
 440     Handle exception(THREAD, PENDING_EXCEPTION);
 441     CLEAR_PENDING_EXCEPTION;
 442     java_lang_Throwable::java_printStackTrace(exception, THREAD);
 443   }
 444 #endif
 445 
 446   // Hang forever on exit if we're reporting an error.
 447   if (ShowMessageBoxOnError && is_error_reported()) {
 448     os::infinite_sleep();
 449   }
 450 
 451   EventThreadEnd event;
 452   if (event.should_commit()) {
 453     event.set_thread(THREAD_TRACE_ID(thread));
 454     event.commit();
 455   }
 456 
 457   TRACE_VM_EXIT();
 458 
 459   // Stop the WatcherThread. We do this before disenrolling various
 460   // PeriodicTasks to reduce the likelihood of races.
 461   if (PeriodicTask::num_tasks() > 0) {
 462     WatcherThread::stop();
 463   }
 464 
 465   // Print statistics gathered (profiling ...)
 466   if (Arguments::has_profile()) {
 467     FlatProfiler::disengage();
 468     FlatProfiler::print(10);
 469   }
 470 
 471   // shut down the StatSampler task
 472   StatSampler::disengage();
 473   StatSampler::destroy();
 474 
 475   // Stop concurrent GC threads
 476   Universe::heap()->stop();
 477 
 478   // Print GC/heap related information.
 479   Log(gc, heap, exit) log;
 480   if (log.is_info()) {
 481     ResourceMark rm;
 482     Universe::print_on(log.info_stream());
 483     if (log.is_trace()) {
 484       ClassLoaderDataGraph::dump_on(log.trace_stream());
 485     }
 486   }
 487   AdaptiveSizePolicyOutput::print();
 488 
 489   if (PrintBytecodeHistogram) {
 490     BytecodeHistogram::print();
 491   }
 492 
 493   if (JvmtiExport::should_post_thread_life()) {
 494     JvmtiExport::post_thread_end(thread);
 495   }
 496 
 497   // Always call even when there are not JVMTI environments yet, since environments
 498   // may be attached late and JVMTI must track phases of VM execution
 499   JvmtiExport::post_vm_death();
 500   Threads::shutdown_vm_agents();
 501 
 502   // Terminate the signal thread
 503   // Note: we don't wait until it actually dies.
 504   os::terminate_signal_thread();
 505 
 506   print_statistics();
 507   Universe::heap()->print_tracing_info();
 508 
 509   { MutexLocker ml(BeforeExit_lock);
 510     _before_exit_status = BEFORE_EXIT_DONE;
 511     BeforeExit_lock->notify_all();
 512   }
 513 
 514   if (VerifyStringTableAtExit) {
 515     int fail_cnt = 0;
 516     {
 517       MutexLocker ml(StringTable_lock);
 518       fail_cnt = StringTable::verify_and_compare_entries();
 519     }
 520 
 521     if (fail_cnt != 0) {
 522       tty->print_cr("ERROR: fail_cnt=%d", fail_cnt);
 523       guarantee(fail_cnt == 0, "unexpected StringTable verification failures");
 524     }
 525   }
 526 
 527   #undef BEFORE_EXIT_NOT_RUN
 528   #undef BEFORE_EXIT_RUNNING
 529   #undef BEFORE_EXIT_DONE
 530 }
 531 
 532 void vm_exit(int code) {
 533   Thread* thread =
 534       ThreadLocalStorage::is_initialized() ? Thread::current_or_null() : NULL;
 535   if (thread == NULL) {
 536     // very early initialization failure -- just exit
 537     vm_direct_exit(code);
 538   }
 539 
 540   if (VMThread::vm_thread() != NULL) {
 541     // Fire off a VM_Exit operation to bring VM to a safepoint and exit
 542     VM_Exit op(code);
 543     if (thread->is_Java_thread())
 544       ((JavaThread*)thread)->set_thread_state(_thread_in_vm);
 545     VMThread::execute(&op);
 546     // should never reach here; but in case something wrong with VM Thread.
 547     vm_direct_exit(code);
 548   } else {
 549     // VM thread is gone, just exit
 550     vm_direct_exit(code);
 551   }
 552   ShouldNotReachHere();
 553 }
 554 
 555 void notify_vm_shutdown() {
 556   // For now, just a dtrace probe.
 557   HOTSPOT_VM_SHUTDOWN();
 558   HS_DTRACE_WORKAROUND_TAIL_CALL_BUG();
 559 }
 560 
 561 void vm_direct_exit(int code) {
 562   notify_vm_shutdown();
 563   os::wait_for_keypress_at_exit();
 564   os::exit(code);
 565 }
 566 
 567 void vm_perform_shutdown_actions() {
 568   // Warning: do not call 'exit_globals()' here. All threads are still running.
 569   // Calling 'exit_globals()' will disable thread-local-storage and cause all
 570   // kinds of assertions to trigger in debug mode.
 571   if (is_init_completed()) {
 572     Thread* thread = Thread::current_or_null();
 573     if (thread != NULL && thread->is_Java_thread()) {
 574       // We are leaving the VM, set state to native (in case any OS exit
 575       // handlers call back to the VM)
 576       JavaThread* jt = (JavaThread*)thread;
 577       // Must always be walkable or have no last_Java_frame when in
 578       // thread_in_native
 579       jt->frame_anchor()->make_walkable(jt);
 580       jt->set_thread_state(_thread_in_native);
 581     }
 582   }
 583   notify_vm_shutdown();
 584 }
 585 
 586 void vm_shutdown()
 587 {
 588   vm_perform_shutdown_actions();
 589   os::wait_for_keypress_at_exit();
 590   os::shutdown();
 591 }
 592 
 593 void vm_abort(bool dump_core) {
 594   vm_perform_shutdown_actions();
 595   os::wait_for_keypress_at_exit();
 596 
 597   // Flush stdout and stderr before abort.
 598   fflush(stdout);
 599   fflush(stderr);
 600 
 601   os::abort(dump_core);
 602   ShouldNotReachHere();
 603 }
 604 
 605 void vm_notify_during_shutdown(const char* error, const char* message) {
 606   if (error != NULL) {
 607     tty->print_cr("Error occurred during initialization of VM");
 608     tty->print("%s", error);
 609     if (message != NULL) {
 610       tty->print_cr(": %s", message);
 611     }
 612     else {
 613       tty->cr();
 614     }
 615   }
 616   if (ShowMessageBoxOnError && WizardMode) {
 617     fatal("Error occurred during initialization of VM");
 618   }
 619 }
 620 
 621 void vm_exit_during_initialization(Handle exception) {
 622   tty->print_cr("Error occurred during initialization of VM");
 623   // If there are exceptions on this thread it must be cleared
 624   // first and here. Any future calls to EXCEPTION_MARK requires
 625   // that no pending exceptions exist.
 626   Thread *THREAD = Thread::current(); // can't be NULL
 627   if (HAS_PENDING_EXCEPTION) {
 628     CLEAR_PENDING_EXCEPTION;
 629   }
 630   java_lang_Throwable::print_stack_trace(exception, tty);
 631   tty->cr();
 632   vm_notify_during_shutdown(NULL, NULL);
 633 
 634   // Failure during initialization, we don't want to dump core
 635   vm_abort(false);
 636 }
 637 
 638 void vm_exit_during_initialization(Symbol* ex, const char* message) {
 639   ResourceMark rm;
 640   vm_notify_during_shutdown(ex->as_C_string(), message);
 641 
 642   // Failure during initialization, we don't want to dump core
 643   vm_abort(false);
 644 }
 645 
 646 void vm_exit_during_initialization(const char* error, const char* message) {
 647   vm_notify_during_shutdown(error, message);
 648 
 649   // Failure during initialization, we don't want to dump core
 650   vm_abort(false);
 651 }
 652 
 653 void vm_shutdown_during_initialization(const char* error, const char* message) {
 654   vm_notify_during_shutdown(error, message);
 655   vm_shutdown();
 656 }
 657 
 658 JDK_Version JDK_Version::_current;
 659 const char* JDK_Version::_runtime_name;
 660 const char* JDK_Version::_runtime_version;
 661 
 662 void JDK_Version::initialize() {
 663   jdk_version_info info;
 664   assert(!_current.is_valid(), "Don't initialize twice");
 665 
 666   void *lib_handle = os::native_java_library();
 667   jdk_version_info_fn_t func = CAST_TO_FN_PTR(jdk_version_info_fn_t,
 668      os::dll_lookup(lib_handle, "JDK_GetVersionInfo0"));
 669 
 670   assert(func != NULL, "Support for JDK 1.5 or older has been removed after JEP-223");
 671 
 672   (*func)(&info, sizeof(info));
 673 
 674   int major = JDK_VERSION_MAJOR(info.jdk_version);
 675   int minor = JDK_VERSION_MINOR(info.jdk_version);
 676   int security = JDK_VERSION_SECURITY(info.jdk_version);
 677   int build = JDK_VERSION_BUILD(info.jdk_version);
 678 
 679   // Incompatible with pre-4243978 JDK.
 680   if (info.pending_list_uses_discovered_field == 0) {
 681     vm_exit_during_initialization(
 682       "Incompatible JDK is not using Reference.discovered field for pending list");
 683   }
 684   _current = JDK_Version(major, minor, security, info.patch_version, build,
 685                          info.thread_park_blocker == 1,
 686                          info.post_vm_init_hook_enabled == 1);
 687 }
 688 
 689 void JDK_Version_init() {
 690   JDK_Version::initialize();
 691 }
 692 
 693 static int64_t encode_jdk_version(const JDK_Version& v) {
 694   return
 695     ((int64_t)v.major_version()          << (BitsPerByte * 4)) |
 696     ((int64_t)v.minor_version()          << (BitsPerByte * 3)) |
 697     ((int64_t)v.security_version()       << (BitsPerByte * 2)) |
 698     ((int64_t)v.patch_version()          << (BitsPerByte * 1)) |
 699     ((int64_t)v.build_number()           << (BitsPerByte * 0));
 700 }
 701 
 702 int JDK_Version::compare(const JDK_Version& other) const {
 703   assert(is_valid() && other.is_valid(), "Invalid version (uninitialized?)");
 704   uint64_t e = encode_jdk_version(*this);
 705   uint64_t o = encode_jdk_version(other);
 706   return (e > o) ? 1 : ((e == o) ? 0 : -1);
 707 }
 708 
 709 void JDK_Version::to_string(char* buffer, size_t buflen) const {
 710   assert(buffer && buflen > 0, "call with useful buffer");
 711   size_t index = 0;
 712 
 713   if (!is_valid()) {
 714     jio_snprintf(buffer, buflen, "%s", "(uninitialized)");
 715   } else {
 716     int rc = jio_snprintf(
 717         &buffer[index], buflen - index, "%d.%d", _major, _minor);
 718     if (rc == -1) return;
 719     index += rc;
 720     if (_security > 0) {
 721       rc = jio_snprintf(&buffer[index], buflen - index, ".%d", _security);
 722     }
 723     if (_patch > 0) {
 724       rc = jio_snprintf(&buffer[index], buflen - index, ".%d", _patch);
 725       if (rc == -1) return;
 726       index += rc;
 727     }
 728     if (_build > 0) {
 729       rc = jio_snprintf(&buffer[index], buflen - index, "+%d", _build);
 730       if (rc == -1) return;
 731       index += rc;
 732     }
 733   }
 734 }
--- EOF ---