rev 48154 : 8191789: migrate more Thread-SMR stuff from thread.[ch]pp -> threadSMR.[ch]pp
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   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 "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 "gc/shared/genCollectedHeap.hpp"
  35 #include "interpreter/bytecodeHistogram.hpp"
  36 #if INCLUDE_JVMCI
  37 #include "jvmci/jvmciCompiler.hpp"
  38 #include "jvmci/jvmciRuntime.hpp"
  39 #endif
  40 #include "logging/log.hpp"
  41 #include "logging/logStream.hpp"
  42 #include "memory/oopFactory.hpp"
  43 #include "memory/resourceArea.hpp"
  44 #include "memory/universe.hpp"
  45 #include "oops/constantPool.hpp"
  46 #include "oops/generateOopMap.hpp"
  47 #include "oops/instanceKlass.hpp"
  48 #include "oops/instanceOop.hpp"
  49 #include "oops/method.hpp"
  50 #include "oops/objArrayOop.hpp"
  51 #include "oops/oop.inline.hpp"
  52 #include "oops/symbol.hpp"
  53 #include "prims/jvmtiExport.hpp"
  54 #include "runtime/arguments.hpp"
  55 #include "runtime/biasedLocking.hpp"
  56 #include "runtime/compilationPolicy.hpp"
  57 #include "runtime/deoptimization.hpp"
  58 #include "runtime/init.hpp"
  59 #include "runtime/interfaceSupport.hpp"
  60 #include "runtime/java.hpp"
  61 #include "runtime/memprofiler.hpp"
  62 #include "runtime/sharedRuntime.hpp"
  63 #include "runtime/statSampler.hpp"
  64 #include "runtime/sweeper.hpp"
  65 #include "runtime/task.hpp"
  66 #include "runtime/thread.inline.hpp"
  67 #include "runtime/timer.hpp"
  68 #include "runtime/vm_operations.hpp"
  69 #include "services/memTracker.hpp"
  70 #include "trace/traceMacros.hpp"
  71 #include "trace/tracing.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 #if INCLUDE_ALL_GCS
  78 #include "gc/cms/concurrentMarkSweepThread.hpp"
  79 #include "gc/parallel/psScavenge.hpp"
  80 #endif // INCLUDE_ALL_GCS
  81 #ifdef COMPILER1
  82 #include "c1/c1_Compiler.hpp"
  83 #include "c1/c1_Runtime1.hpp"
  84 #endif
  85 #ifdef COMPILER2
  86 #include "code/compiledIC.hpp"
  87 #include "compiler/methodLiveness.hpp"
  88 #include "opto/compile.hpp"
  89 #include "opto/indexSet.hpp"
  90 #include "opto/runtime.hpp"
  91 #endif
  92 
  93 GrowableArray<Method*>* collected_profiled_methods;
  94 
  95 int compare_methods(Method** a, Method** b) {
  96   // %%% there can be 32-bit overflow here
  97   return ((*b)->invocation_count() + (*b)->compiled_invocation_count())
  98        - ((*a)->invocation_count() + (*a)->compiled_invocation_count());
  99 }
 100 
 101 void collect_profiled_methods(Method* m) {
 102   Thread* thread = Thread::current();
 103   methodHandle mh(thread, m);
 104   if ((m->method_data() != NULL) &&
 105       (PrintMethodData || CompilerOracle::should_print(mh))) {
 106     collected_profiled_methods->push(m);
 107   }
 108 }
 109 
 110 void print_method_profiling_data() {
 111   if (ProfileInterpreter COMPILER1_PRESENT(|| C1UpdateMethodData) &&
 112      (PrintMethodData || CompilerOracle::should_print_methods())) {
 113     ResourceMark rm;
 114     HandleMark hm;
 115     collected_profiled_methods = new GrowableArray<Method*>(1024);
 116     SystemDictionary::methods_do(collect_profiled_methods);
 117     collected_profiled_methods->sort(&compare_methods);
 118 
 119     int count = collected_profiled_methods->length();
 120     int total_size = 0;
 121     if (count > 0) {
 122       for (int index = 0; index < count; index++) {
 123         Method* m = collected_profiled_methods->at(index);
 124         ttyLocker ttyl;
 125         tty->print_cr("------------------------------------------------------------------------");
 126         m->print_invocation_count();
 127         tty->print_cr("  mdo size: %d bytes", m->method_data()->size_in_bytes());
 128         tty->cr();
 129         // Dump data on parameters if any
 130         if (m->method_data() != NULL && m->method_data()->parameters_type_data() != NULL) {
 131           tty->fill_to(2);
 132           m->method_data()->parameters_type_data()->print_data_on(tty);
 133         }
 134         m->print_codes();
 135         total_size += m->method_data()->size_in_bytes();
 136       }
 137       tty->print_cr("------------------------------------------------------------------------");
 138       tty->print_cr("Total MDO size: %d bytes", total_size);
 139     }
 140   }
 141 }
 142 
 143 
 144 #ifndef PRODUCT
 145 
 146 // Statistics printing (method invocation histogram)
 147 
 148 GrowableArray<Method*>* collected_invoked_methods;
 149 
 150 void collect_invoked_methods(Method* m) {
 151   if (m->invocation_count() + m->compiled_invocation_count() >= 1 ) {
 152     collected_invoked_methods->push(m);
 153   }
 154 }
 155 
 156 
 157 
 158 
 159 void print_method_invocation_histogram() {
 160   ResourceMark rm;
 161   HandleMark hm;
 162   collected_invoked_methods = new GrowableArray<Method*>(1024);
 163   SystemDictionary::methods_do(collect_invoked_methods);
 164   collected_invoked_methods->sort(&compare_methods);
 165   //
 166   tty->cr();
 167   tty->print_cr("Histogram Over Method Invocation Counters (cutoff = " INTX_FORMAT "):", MethodHistogramCutoff);
 168   tty->cr();
 169   tty->print_cr("____Count_(I+C)____Method________________________Module_________________");
 170   unsigned total = 0, int_total = 0, comp_total = 0, static_total = 0, final_total = 0,
 171       synch_total = 0, nativ_total = 0, acces_total = 0;
 172   for (int index = 0; index < collected_invoked_methods->length(); index++) {
 173     Method* m = collected_invoked_methods->at(index);
 174     int c = m->invocation_count() + m->compiled_invocation_count();
 175     if (c >= MethodHistogramCutoff) m->print_invocation_count();
 176     int_total  += m->invocation_count();
 177     comp_total += m->compiled_invocation_count();
 178     if (m->is_final())        final_total  += c;
 179     if (m->is_static())       static_total += c;
 180     if (m->is_synchronized()) synch_total  += c;
 181     if (m->is_native())       nativ_total  += c;
 182     if (m->is_accessor())     acces_total  += c;
 183   }
 184   tty->cr();
 185   total = int_total + comp_total;
 186   tty->print_cr("Invocations summary:");
 187   tty->print_cr("\t%9d (%4.1f%%) interpreted",  int_total,    100.0 * int_total    / total);
 188   tty->print_cr("\t%9d (%4.1f%%) compiled",     comp_total,   100.0 * comp_total   / total);
 189   tty->print_cr("\t%9d (100%%)  total",         total);
 190   tty->print_cr("\t%9d (%4.1f%%) synchronized", synch_total,  100.0 * synch_total  / total);
 191   tty->print_cr("\t%9d (%4.1f%%) final",        final_total,  100.0 * final_total  / total);
 192   tty->print_cr("\t%9d (%4.1f%%) static",       static_total, 100.0 * static_total / total);
 193   tty->print_cr("\t%9d (%4.1f%%) native",       nativ_total,  100.0 * nativ_total  / total);
 194   tty->print_cr("\t%9d (%4.1f%%) accessor",     acces_total,  100.0 * acces_total  / total);
 195   tty->cr();
 196   SharedRuntime::print_call_statistics(comp_total);
 197 }
 198 
 199 void print_bytecode_count() {
 200   if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
 201     tty->print_cr("[BytecodeCounter::counter_value = %d]", BytecodeCounter::counter_value());
 202   }
 203 }
 204 
 205 AllocStats alloc_stats;
 206 
 207 
 208 
 209 // General statistics printing (profiling ...)
 210 void print_statistics() {
 211 #ifdef ASSERT
 212 
 213   if (CountRuntimeCalls) {
 214     extern Histogram *RuntimeHistogram;
 215     RuntimeHistogram->print();
 216   }
 217 
 218   if (CountJNICalls) {
 219     extern Histogram *JNIHistogram;
 220     JNIHistogram->print();
 221   }
 222 
 223   if (CountJVMCalls) {
 224     extern Histogram *JVMHistogram;
 225     JVMHistogram->print();
 226   }
 227 
 228 #endif
 229 
 230   if (MemProfiling) {
 231     MemProfiler::disengage();
 232   }
 233 
 234   if (CITime) {
 235     CompileBroker::print_times();
 236   }
 237 
 238 #ifdef COMPILER1
 239   if ((PrintC1Statistics || LogVMOutput || LogCompilation) && UseCompiler) {
 240     FlagSetting fs(DisplayVMOutput, DisplayVMOutput && PrintC1Statistics);
 241     Runtime1::print_statistics();
 242     Deoptimization::print_statistics();
 243     SharedRuntime::print_statistics();
 244   }
 245 #endif /* COMPILER1 */
 246 
 247 #ifdef COMPILER2
 248   if ((PrintOptoStatistics || LogVMOutput || LogCompilation) && UseCompiler) {
 249     FlagSetting fs(DisplayVMOutput, DisplayVMOutput && PrintOptoStatistics);
 250     Compile::print_statistics();
 251 #ifndef COMPILER1
 252     Deoptimization::print_statistics();
 253     SharedRuntime::print_statistics();
 254 #endif //COMPILER1
 255     os::print_statistics();
 256   }
 257 
 258   if (PrintLockStatistics || PrintPreciseBiasedLockingStatistics || PrintPreciseRTMLockingStatistics) {
 259     OptoRuntime::print_named_counters();
 260   }
 261 
 262   if (TimeLivenessAnalysis) {
 263     MethodLiveness::print_times();
 264   }
 265 #ifdef ASSERT
 266   if (CollectIndexSetStatistics) {
 267     IndexSet::print_statistics();
 268   }
 269 #endif // ASSERT
 270 #else
 271 #ifdef INCLUDE_JVMCI
 272 #ifndef COMPILER1
 273   if ((TraceDeoptimization || LogVMOutput || LogCompilation) && UseCompiler) {
 274     FlagSetting fs(DisplayVMOutput, DisplayVMOutput && TraceDeoptimization);
 275     Deoptimization::print_statistics();
 276     SharedRuntime::print_statistics();
 277   }
 278 #endif
 279 #endif
 280 #endif
 281 
 282   if (PrintAOTStatistics) {
 283     AOTLoader::print_statistics();
 284   }
 285 
 286   if (PrintNMethodStatistics) {
 287     nmethod::print_statistics();
 288   }
 289   if (CountCompiledCalls) {
 290     print_method_invocation_histogram();
 291   }
 292 
 293   print_method_profiling_data();
 294 
 295   if (TimeCompilationPolicy) {
 296     CompilationPolicy::policy()->print_time();
 297   }
 298   if (TimeOopMap) {
 299     GenerateOopMap::print_time();
 300   }
 301   if (ProfilerCheckIntervals) {
 302     PeriodicTask::print_intervals();
 303   }
 304   if (PrintSymbolTableSizeHistogram) {
 305     SymbolTable::print_histogram();
 306   }
 307   if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
 308     BytecodeCounter::print();
 309   }
 310   if (PrintBytecodePairHistogram) {
 311     BytecodePairHistogram::print();
 312   }
 313 
 314   if (PrintCodeCache) {
 315     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 316     CodeCache::print();
 317   }
 318 
 319   if (PrintMethodFlushingStatistics) {
 320     NMethodSweeper::print();
 321   }
 322 
 323   if (PrintCodeCache2) {
 324     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 325     CodeCache::print_internals();
 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 (LogTouchedMethods && PrintTouchedMethodsAtExit) {
 348     Method::print_touched_methods(tty);
 349   }
 350 
 351   if (PrintBiasedLockingStatistics) {
 352     BiasedLocking::print_counters();
 353   }
 354 
 355   // Native memory tracking data
 356   if (PrintNMTStatistics) {
 357     MemTracker::final_report(tty);
 358   }
 359 
 360   ThreadsSMRSupport::log_smr_statistics();
 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   ThreadsSMRSupport::log_smr_statistics();
 403 }
 404 
 405 #endif
 406 
 407 // Note: before_exit() can be executed only once, if more than one threads
 408 //       are trying to shutdown the VM at the same time, only one thread
 409 //       can run before_exit() and all other threads must wait.
 410 void before_exit(JavaThread* thread) {
 411   #define BEFORE_EXIT_NOT_RUN 0
 412   #define BEFORE_EXIT_RUNNING 1
 413   #define BEFORE_EXIT_DONE    2
 414   static jint volatile _before_exit_status = BEFORE_EXIT_NOT_RUN;
 415 
 416   // Note: don't use a Mutex to guard the entire before_exit(), as
 417   // JVMTI post_thread_end_event and post_vm_death_event will run native code.
 418   // A CAS or OSMutex would work just fine but then we need to manipulate
 419   // thread state for Safepoint. Here we use Monitor wait() and notify_all()
 420   // for synchronization.
 421   { MutexLocker ml(BeforeExit_lock);
 422     switch (_before_exit_status) {
 423     case BEFORE_EXIT_NOT_RUN:
 424       _before_exit_status = BEFORE_EXIT_RUNNING;
 425       break;
 426     case BEFORE_EXIT_RUNNING:
 427       while (_before_exit_status == BEFORE_EXIT_RUNNING) {
 428         BeforeExit_lock->wait();
 429       }
 430       assert(_before_exit_status == BEFORE_EXIT_DONE, "invalid state");
 431       return;
 432     case BEFORE_EXIT_DONE:
 433       // need block to avoid SS compiler bug
 434       {
 435         return;
 436       }
 437     }
 438   }
 439 
 440 #if INCLUDE_JVMCI
 441   // We are not using CATCH here because we want the exit to continue normally.
 442   Thread* THREAD = thread;
 443   JVMCIRuntime::shutdown(THREAD);
 444   if (HAS_PENDING_EXCEPTION) {
 445     HandleMark hm(THREAD);
 446     Handle exception(THREAD, PENDING_EXCEPTION);
 447     CLEAR_PENDING_EXCEPTION;
 448     java_lang_Throwable::java_printStackTrace(exception, THREAD);
 449   }
 450 #endif
 451 
 452   // Hang forever on exit if we're reporting an error.
 453   if (ShowMessageBoxOnError && VMError::is_error_reported()) {
 454     os::infinite_sleep();
 455   }
 456 
 457   EventThreadEnd event;
 458   if (event.should_commit()) {
 459     event.set_thread(THREAD_TRACE_ID(thread));
 460     event.commit();
 461   }
 462 
 463   TRACE_VM_EXIT();
 464 
 465   // Stop the WatcherThread. We do this before disenrolling various
 466   // PeriodicTasks to reduce the likelihood of races.
 467   if (PeriodicTask::num_tasks() > 0) {
 468     WatcherThread::stop();
 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     LogStream ls_info(log.info());
 483     Universe::print_on(&ls_info);
 484     if (log.is_trace()) {
 485       LogStream ls_trace(log.trace());
 486       ClassLoaderDataGraph::dump_on(&ls_trace);
 487     }
 488   }
 489 
 490   if (PrintBytecodeHistogram) {
 491     BytecodeHistogram::print();
 492   }
 493 
 494   if (JvmtiExport::should_post_thread_life()) {
 495     JvmtiExport::post_thread_end(thread);
 496   }
 497 
 498   // Always call even when there are not JVMTI environments yet, since environments
 499   // may be attached late and JVMTI must track phases of VM execution
 500   JvmtiExport::post_vm_death();
 501   Threads::shutdown_vm_agents();
 502 
 503   // Terminate the signal thread
 504   // Note: we don't wait until it actually dies.
 505   os::terminate_signal_thread();
 506 
 507   print_statistics();
 508   Universe::heap()->print_tracing_info();
 509 
 510   { MutexLocker ml(BeforeExit_lock);
 511     _before_exit_status = BEFORE_EXIT_DONE;
 512     BeforeExit_lock->notify_all();
 513   }
 514 
 515   if (VerifyStringTableAtExit) {
 516     int fail_cnt = 0;
 517     {
 518       MutexLocker ml(StringTable_lock);
 519       fail_cnt = StringTable::verify_and_compare_entries();
 520     }
 521 
 522     if (fail_cnt != 0) {
 523       tty->print_cr("ERROR: fail_cnt=%d", fail_cnt);
 524       guarantee(fail_cnt == 0, "unexpected StringTable verification failures");
 525     }
 526   }
 527 
 528   #undef BEFORE_EXIT_NOT_RUN
 529   #undef BEFORE_EXIT_RUNNING
 530   #undef BEFORE_EXIT_DONE
 531 }
 532 
 533 void vm_exit(int code) {
 534   Thread* thread =
 535       ThreadLocalStorage::is_initialized() ? Thread::current_or_null() : NULL;
 536   if (thread == NULL) {
 537     // very early initialization failure -- just exit
 538     vm_direct_exit(code);
 539   }
 540 
 541   if (VMThread::vm_thread() != NULL) {
 542     // Fire off a VM_Exit operation to bring VM to a safepoint and exit
 543     VM_Exit op(code);
 544     if (thread->is_Java_thread())
 545       ((JavaThread*)thread)->set_thread_state(_thread_in_vm);
 546     VMThread::execute(&op);
 547     // should never reach here; but in case something wrong with VM Thread.
 548     vm_direct_exit(code);
 549   } else {
 550     // VM thread is gone, just exit
 551     vm_direct_exit(code);
 552   }
 553   ShouldNotReachHere();
 554 }
 555 
 556 void notify_vm_shutdown() {
 557   // For now, just a dtrace probe.
 558   HOTSPOT_VM_SHUTDOWN();
 559   HS_DTRACE_WORKAROUND_TAIL_CALL_BUG();
 560 }
 561 
 562 void vm_direct_exit(int code) {
 563   notify_vm_shutdown();
 564   os::wait_for_keypress_at_exit();
 565   os::exit(code);
 566 }
 567 
 568 void vm_perform_shutdown_actions() {
 569   // Warning: do not call 'exit_globals()' here. All threads are still running.
 570   // Calling 'exit_globals()' will disable thread-local-storage and cause all
 571   // kinds of assertions to trigger in debug mode.
 572   if (is_init_completed()) {
 573     Thread* thread = Thread::current_or_null();
 574     if (thread != NULL && thread->is_Java_thread()) {
 575       // We are leaving the VM, set state to native (in case any OS exit
 576       // handlers call back to the VM)
 577       JavaThread* jt = (JavaThread*)thread;
 578       // Must always be walkable or have no last_Java_frame when in
 579       // thread_in_native
 580       jt->frame_anchor()->make_walkable(jt);
 581       jt->set_thread_state(_thread_in_native);
 582     }
 583   }
 584   notify_vm_shutdown();
 585 }
 586 
 587 void vm_shutdown()
 588 {
 589   vm_perform_shutdown_actions();
 590   os::wait_for_keypress_at_exit();
 591   os::shutdown();
 592 }
 593 
 594 void vm_abort(bool dump_core) {
 595   vm_perform_shutdown_actions();
 596   os::wait_for_keypress_at_exit();
 597 
 598   // Flush stdout and stderr before abort.
 599   fflush(stdout);
 600   fflush(stderr);
 601 
 602   os::abort(dump_core);
 603   ShouldNotReachHere();
 604 }
 605 
 606 void vm_notify_during_shutdown(const char* error, const char* message) {
 607   if (error != NULL) {
 608     tty->print_cr("Error occurred during initialization of VM");
 609     tty->print("%s", error);
 610     if (message != NULL) {
 611       tty->print_cr(": %s", message);
 612     }
 613     else {
 614       tty->cr();
 615     }
 616   }
 617   if (ShowMessageBoxOnError && WizardMode) {
 618     fatal("Error occurred during initialization of VM");
 619   }
 620 }
 621 
 622 void vm_exit_during_initialization() {
 623   vm_notify_during_shutdown(NULL, NULL);
 624 
 625   // Failure during initialization, we don't want to dump core
 626   vm_abort(false);
 627 }
 628 
 629 void vm_exit_during_initialization(Handle exception) {
 630   tty->print_cr("Error occurred during initialization of VM");
 631   // If there are exceptions on this thread it must be cleared
 632   // first and here. Any future calls to EXCEPTION_MARK requires
 633   // that no pending exceptions exist.
 634   Thread *THREAD = Thread::current(); // can't be NULL
 635   if (HAS_PENDING_EXCEPTION) {
 636     CLEAR_PENDING_EXCEPTION;
 637   }
 638   java_lang_Throwable::print_stack_trace(exception, tty);
 639   tty->cr();
 640   vm_notify_during_shutdown(NULL, NULL);
 641 
 642   // Failure during initialization, we don't want to dump core
 643   vm_abort(false);
 644 }
 645 
 646 void vm_exit_during_initialization(Symbol* ex, const char* message) {
 647   ResourceMark rm;
 648   vm_notify_during_shutdown(ex->as_C_string(), message);
 649 
 650   // Failure during initialization, we don't want to dump core
 651   vm_abort(false);
 652 }
 653 
 654 void vm_exit_during_initialization(const char* error, const char* message) {
 655   vm_notify_during_shutdown(error, message);
 656 
 657   // Failure during initialization, we don't want to dump core
 658   vm_abort(false);
 659 }
 660 
 661 void vm_shutdown_during_initialization(const char* error, const char* message) {
 662   vm_notify_during_shutdown(error, message);
 663   vm_shutdown();
 664 }
 665 
 666 JDK_Version JDK_Version::_current;
 667 const char* JDK_Version::_runtime_name;
 668 const char* JDK_Version::_runtime_version;
 669 
 670 void JDK_Version::initialize() {
 671   jdk_version_info info;
 672   assert(!_current.is_valid(), "Don't initialize twice");
 673 
 674   void *lib_handle = os::native_java_library();
 675   jdk_version_info_fn_t func = CAST_TO_FN_PTR(jdk_version_info_fn_t,
 676      os::dll_lookup(lib_handle, "JDK_GetVersionInfo0"));
 677 
 678   assert(func != NULL, "Support for JDK 1.5 or older has been removed after JEP-223");
 679 
 680   (*func)(&info, sizeof(info));
 681 
 682   int major = JDK_VERSION_MAJOR(info.jdk_version);
 683   int minor = JDK_VERSION_MINOR(info.jdk_version);
 684   int security = JDK_VERSION_SECURITY(info.jdk_version);
 685   int build = JDK_VERSION_BUILD(info.jdk_version);
 686 
 687   // Incompatible with pre-4243978 JDK.
 688   if (info.pending_list_uses_discovered_field == 0) {
 689     vm_exit_during_initialization(
 690       "Incompatible JDK is not using Reference.discovered field for pending list");
 691   }
 692   _current = JDK_Version(major, minor, security, info.patch_version, build,
 693                          info.thread_park_blocker == 1,
 694                          info.post_vm_init_hook_enabled == 1);
 695 }
 696 
 697 void JDK_Version_init() {
 698   JDK_Version::initialize();
 699 }
 700 
 701 static int64_t encode_jdk_version(const JDK_Version& v) {
 702   return
 703     ((int64_t)v.major_version()          << (BitsPerByte * 4)) |
 704     ((int64_t)v.minor_version()          << (BitsPerByte * 3)) |
 705     ((int64_t)v.security_version()       << (BitsPerByte * 2)) |
 706     ((int64_t)v.patch_version()          << (BitsPerByte * 1)) |
 707     ((int64_t)v.build_number()           << (BitsPerByte * 0));
 708 }
 709 
 710 int JDK_Version::compare(const JDK_Version& other) const {
 711   assert(is_valid() && other.is_valid(), "Invalid version (uninitialized?)");
 712   uint64_t e = encode_jdk_version(*this);
 713   uint64_t o = encode_jdk_version(other);
 714   return (e > o) ? 1 : ((e == o) ? 0 : -1);
 715 }
 716 
 717 void JDK_Version::to_string(char* buffer, size_t buflen) const {
 718   assert(buffer && buflen > 0, "call with useful buffer");
 719   size_t index = 0;
 720 
 721   if (!is_valid()) {
 722     jio_snprintf(buffer, buflen, "%s", "(uninitialized)");
 723   } else {
 724     int rc = jio_snprintf(
 725         &buffer[index], buflen - index, "%d.%d", _major, _minor);
 726     if (rc == -1) return;
 727     index += rc;
 728     if (_security > 0) {
 729       rc = jio_snprintf(&buffer[index], buflen - index, ".%d", _security);
 730       if (rc == -1) return;
 731       index += rc;
 732     }
 733     if (_patch > 0) {
 734       rc = jio_snprintf(&buffer[index], buflen - index, ".%d", _patch);
 735       if (rc == -1) return;
 736       index += rc;
 737     }
 738     if (_build > 0) {
 739       rc = jio_snprintf(&buffer[index], buflen - index, "+%d", _build);
 740       if (rc == -1) return;
 741       index += rc;
 742     }
 743   }
 744 }
--- EOF ---