java.cpp revision 4802:f2110083203d 
1/*
2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25#include "precompiled.hpp"
26#include "classfile/classLoader.hpp"
27#include "classfile/symbolTable.hpp"
28#include "classfile/systemDictionary.hpp"
29#include "code/codeCache.hpp"
30#include "compiler/compileBroker.hpp"
31#include "compiler/compilerOracle.hpp"
32#include "interpreter/bytecodeHistogram.hpp"
33#include "memory/genCollectedHeap.hpp"
34#include "memory/oopFactory.hpp"
35#include "memory/universe.hpp"
36#include "oops/constantPool.hpp"
37#include "oops/generateOopMap.hpp"
38#include "oops/instanceKlass.hpp"
39#include "oops/instanceOop.hpp"
40#include "oops/method.hpp"
41#include "oops/objArrayOop.hpp"
42#include "oops/oop.inline.hpp"
43#include "oops/symbol.hpp"
44#include "prims/jvmtiExport.hpp"
45#include "runtime/aprofiler.hpp"
46#include "runtime/arguments.hpp"
47#include "runtime/biasedLocking.hpp"
48#include "runtime/compilationPolicy.hpp"
49#include "runtime/fprofiler.hpp"
50#include "runtime/init.hpp"
51#include "runtime/interfaceSupport.hpp"
52#include "runtime/java.hpp"
53#include "runtime/memprofiler.hpp"
54#include "runtime/sharedRuntime.hpp"
55#include "runtime/statSampler.hpp"
56#include "runtime/task.hpp"
57#include "runtime/thread.inline.hpp"
58#include "runtime/timer.hpp"
59#include "runtime/vm_operations.hpp"
60#include "services/memReporter.hpp"
61#include "services/memTracker.hpp"
62#include "trace/tracing.hpp"
63#include "utilities/dtrace.hpp"
64#include "utilities/globalDefinitions.hpp"
65#include "utilities/histogram.hpp"
66#include "utilities/macros.hpp"
67#include "utilities/vmError.hpp"
68#ifdef TARGET_ARCH_x86
69# include "vm_version_x86.hpp"
70#endif
71#ifdef TARGET_ARCH_sparc
72# include "vm_version_sparc.hpp"
73#endif
74#ifdef TARGET_ARCH_zero
75# include "vm_version_zero.hpp"
76#endif
77#ifdef TARGET_ARCH_arm
78# include "vm_version_arm.hpp"
79#endif
80#ifdef TARGET_ARCH_ppc
81# include "vm_version_ppc.hpp"
82#endif
83#if INCLUDE_ALL_GCS
84#include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp"
85#include "gc_implementation/parallelScavenge/psScavenge.hpp"
86#include "gc_implementation/parallelScavenge/psScavenge.inline.hpp"
87#endif // INCLUDE_ALL_GCS
88#ifdef COMPILER1
89#include "c1/c1_Compiler.hpp"
90#include "c1/c1_Runtime1.hpp"
91#endif
92#ifdef COMPILER2
93#include "code/compiledIC.hpp"
94#include "compiler/methodLiveness.hpp"
95#include "opto/compile.hpp"
96#include "opto/indexSet.hpp"
97#include "opto/runtime.hpp"
98#endif
99
100#ifndef USDT2
101HS_DTRACE_PROBE_DECL(hotspot, vm__shutdown);
102#endif /* !USDT2 */
103
104#ifndef PRODUCT
105
106// Statistics printing (method invocation histogram)
107
108GrowableArray<Method*>* collected_invoked_methods;
109
110void collect_invoked_methods(Method* m) {
111  if (m->invocation_count() + m->compiled_invocation_count() >= 1 ) {
112    collected_invoked_methods->push(m);
113  }
114}
115
116
117GrowableArray<Method*>* collected_profiled_methods;
118
119void collect_profiled_methods(Method* m) {
120  Thread* thread = Thread::current();
121  // This HandleMark prevents a huge amount of handles from being added
122  // to the metadata_handles() array on the thread.
123  HandleMark hm(thread);
124  methodHandle mh(thread, m);
125  if ((m->method_data() != NULL) &&
126      (PrintMethodData || CompilerOracle::should_print(mh))) {
127    collected_profiled_methods->push(m);
128  }
129}
130
131
132int compare_methods(Method** a, Method** b) {
133  // %%% there can be 32-bit overflow here
134  return ((*b)->invocation_count() + (*b)->compiled_invocation_count())
135       - ((*a)->invocation_count() + (*a)->compiled_invocation_count());
136}
137
138
139void print_method_invocation_histogram() {
140  ResourceMark rm;
141  HandleMark hm;
142  collected_invoked_methods = new GrowableArray<Method*>(1024);
143  SystemDictionary::methods_do(collect_invoked_methods);
144  collected_invoked_methods->sort(&compare_methods);
145  //
146  tty->cr();
147  tty->print_cr("Histogram Over MethodOop Invocation Counters (cutoff = %d):", MethodHistogramCutoff);
148  tty->cr();
149  tty->print_cr("____Count_(I+C)____Method________________________Module_________________");
150  unsigned total = 0, int_total = 0, comp_total = 0, static_total = 0, final_total = 0,
151      synch_total = 0, nativ_total = 0, acces_total = 0;
152  for (int index = 0; index < collected_invoked_methods->length(); index++) {
153    Method* m = collected_invoked_methods->at(index);
154    int c = m->invocation_count() + m->compiled_invocation_count();
155    if (c >= MethodHistogramCutoff) m->print_invocation_count();
156    int_total  += m->invocation_count();
157    comp_total += m->compiled_invocation_count();
158    if (m->is_final())        final_total  += c;
159    if (m->is_static())       static_total += c;
160    if (m->is_synchronized()) synch_total  += c;
161    if (m->is_native())       nativ_total  += c;
162    if (m->is_accessor())     acces_total  += c;
163  }
164  tty->cr();
165  total = int_total + comp_total;
166  tty->print_cr("Invocations summary:");
167  tty->print_cr("\t%9d (%4.1f%%) interpreted",  int_total,    100.0 * int_total    / total);
168  tty->print_cr("\t%9d (%4.1f%%) compiled",     comp_total,   100.0 * comp_total   / total);
169  tty->print_cr("\t%9d (100%%)  total",         total);
170  tty->print_cr("\t%9d (%4.1f%%) synchronized", synch_total,  100.0 * synch_total  / total);
171  tty->print_cr("\t%9d (%4.1f%%) final",        final_total,  100.0 * final_total  / total);
172  tty->print_cr("\t%9d (%4.1f%%) static",       static_total, 100.0 * static_total / total);
173  tty->print_cr("\t%9d (%4.1f%%) native",       nativ_total,  100.0 * nativ_total  / total);
174  tty->print_cr("\t%9d (%4.1f%%) accessor",     acces_total,  100.0 * acces_total  / total);
175  tty->cr();
176  SharedRuntime::print_call_statistics(comp_total);
177}
178
179void print_method_profiling_data() {
180  ResourceMark rm;
181  HandleMark hm;
182  collected_profiled_methods = new GrowableArray<Method*>(1024);
183  SystemDictionary::methods_do(collect_profiled_methods);
184  collected_profiled_methods->sort(&compare_methods);
185
186  int count = collected_profiled_methods->length();
187  if (count > 0) {
188    for (int index = 0; index < count; index++) {
189      Method* m = collected_profiled_methods->at(index);
190      ttyLocker ttyl;
191      tty->print_cr("------------------------------------------------------------------------");
192      //m->print_name(tty);
193      m->print_invocation_count();
194      tty->cr();
195      m->print_codes();
196    }
197    tty->print_cr("------------------------------------------------------------------------");
198  }
199}
200
201void print_bytecode_count() {
202  if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
203    tty->print_cr("[BytecodeCounter::counter_value = %d]", BytecodeCounter::counter_value());
204  }
205}
206
207AllocStats alloc_stats;
208
209
210
211// General statistics printing (profiling ...)
212
213void print_statistics() {
214
215#ifdef ASSERT
216
217  if (CountRuntimeCalls) {
218    extern Histogram *RuntimeHistogram;
219    RuntimeHistogram->print();
220  }
221
222  if (CountJNICalls) {
223    extern Histogram *JNIHistogram;
224    JNIHistogram->print();
225  }
226
227  if (CountJVMCalls) {
228    extern Histogram *JVMHistogram;
229    JVMHistogram->print();
230  }
231
232#endif
233
234  if (MemProfiling) {
235    MemProfiler::disengage();
236  }
237
238  if (CITime) {
239    CompileBroker::print_times();
240  }
241
242#ifdef COMPILER1
243  if ((PrintC1Statistics || LogVMOutput || LogCompilation) && UseCompiler) {
244    FlagSetting fs(DisplayVMOutput, DisplayVMOutput && PrintC1Statistics);
245    Runtime1::print_statistics();
246    Deoptimization::print_statistics();
247    SharedRuntime::print_statistics();
248    nmethod::print_statistics();
249  }
250#endif /* COMPILER1 */
251
252#ifdef COMPILER2
253  if ((PrintOptoStatistics || LogVMOutput || LogCompilation) && UseCompiler) {
254    FlagSetting fs(DisplayVMOutput, DisplayVMOutput && PrintOptoStatistics);
255    Compile::print_statistics();
256#ifndef COMPILER1
257    Deoptimization::print_statistics();
258    nmethod::print_statistics();
259    SharedRuntime::print_statistics();
260#endif //COMPILER1
261    os::print_statistics();
262  }
263
264  if (PrintLockStatistics || PrintPreciseBiasedLockingStatistics) {
265    OptoRuntime::print_named_counters();
266  }
267
268  if (TimeLivenessAnalysis) {
269    MethodLiveness::print_times();
270  }
271#ifdef ASSERT
272  if (CollectIndexSetStatistics) {
273    IndexSet::print_statistics();
274  }
275#endif // ASSERT
276#endif // COMPILER2
277  if (CountCompiledCalls) {
278    print_method_invocation_histogram();
279  }
280  if (ProfileInterpreter COMPILER1_PRESENT(|| C1UpdateMethodData)) {
281    print_method_profiling_data();
282  }
283  if (TimeCompiler) {
284    COMPILER2_PRESENT(Compile::print_timers();)
285  }
286  if (TimeCompilationPolicy) {
287    CompilationPolicy::policy()->print_time();
288  }
289  if (TimeOopMap) {
290    GenerateOopMap::print_time();
291  }
292  if (ProfilerCheckIntervals) {
293    PeriodicTask::print_intervals();
294  }
295  if (PrintSymbolTableSizeHistogram) {
296    SymbolTable::print_histogram();
297  }
298  if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
299    BytecodeCounter::print();
300  }
301  if (PrintBytecodePairHistogram) {
302    BytecodePairHistogram::print();
303  }
304
305  if (PrintCodeCache) {
306    MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
307    CodeCache::print();
308  }
309
310  if (PrintCodeCache2) {
311    MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
312    CodeCache::print_internals();
313  }
314
315  if (PrintClassStatistics) {
316    SystemDictionary::print_class_statistics();
317  }
318  if (PrintMethodStatistics) {
319    SystemDictionary::print_method_statistics();
320  }
321
322  if (PrintVtableStats) {
323    klassVtable::print_statistics();
324    klassItable::print_statistics();
325  }
326  if (VerifyOops) {
327    tty->print_cr("+VerifyOops count: %d", StubRoutines::verify_oop_count());
328  }
329
330  print_bytecode_count();
331  if (PrintMallocStatistics) {
332    tty->print("allocation stats: ");
333    alloc_stats.print();
334    tty->cr();
335  }
336
337  if (PrintSystemDictionaryAtExit) {
338    SystemDictionary::print();
339  }
340
341  if (PrintBiasedLockingStatistics) {
342    BiasedLocking::print_counters();
343  }
344
345#ifdef ENABLE_ZAP_DEAD_LOCALS
346#ifdef COMPILER2
347  if (ZapDeadCompiledLocals) {
348    tty->print_cr("Compile::CompiledZap_count = %d", Compile::CompiledZap_count);
349    tty->print_cr("OptoRuntime::ZapDeadCompiledLocals_count = %d", OptoRuntime::ZapDeadCompiledLocals_count);
350  }
351#endif // COMPILER2
352#endif // ENABLE_ZAP_DEAD_LOCALS
353  // Native memory tracking data
354  if (PrintNMTStatistics) {
355    if (MemTracker::is_on()) {
356      BaselineTTYOutputer outputer(tty);
357      MemTracker::print_memory_usage(outputer, K, false);
358    } else {
359      tty->print_cr(MemTracker::reason());
360    }
361  }
362}
363
364#else // PRODUCT MODE STATISTICS
365
366void print_statistics() {
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#ifdef COMPILER2
378  if (PrintPreciseBiasedLockingStatistics) {
379    OptoRuntime::print_named_counters();
380  }
381#endif
382  if (PrintBiasedLockingStatistics) {
383    BiasedLocking::print_counters();
384  }
385
386  // Native memory tracking data
387  if (PrintNMTStatistics) {
388    if (MemTracker::is_on()) {
389      BaselineTTYOutputer outputer(tty);
390      MemTracker::print_memory_usage(outputer, K, false);
391    } else {
392      tty->print_cr(MemTracker::reason());
393    }
394  }
395}
396
397#endif
398
399
400// Helper class for registering on_exit calls through JVM_OnExit
401
402extern "C" {
403    typedef void (*__exit_proc)(void);
404}
405
406class ExitProc : public CHeapObj<mtInternal> {
407 private:
408  __exit_proc _proc;
409  // void (*_proc)(void);
410  ExitProc* _next;
411 public:
412  // ExitProc(void (*proc)(void)) {
413  ExitProc(__exit_proc proc) {
414    _proc = proc;
415    _next = NULL;
416  }
417  void evaluate()               { _proc(); }
418  ExitProc* next() const        { return _next; }
419  void set_next(ExitProc* next) { _next = next; }
420};
421
422
423// Linked list of registered on_exit procedures
424
425static ExitProc* exit_procs = NULL;
426
427
428extern "C" {
429  void register_on_exit_function(void (*func)(void)) {
430    ExitProc *entry = new ExitProc(func);
431    // Classic vm does not throw an exception in case the allocation failed,
432    if (entry != NULL) {
433      entry->set_next(exit_procs);
434      exit_procs = entry;
435    }
436  }
437}
438
439// Note: before_exit() can be executed only once, if more than one threads
440//       are trying to shutdown the VM at the same time, only one thread
441//       can run before_exit() and all other threads must wait.
442void before_exit(JavaThread * thread) {
443  #define BEFORE_EXIT_NOT_RUN 0
444  #define BEFORE_EXIT_RUNNING 1
445  #define BEFORE_EXIT_DONE    2
446  static jint volatile _before_exit_status = BEFORE_EXIT_NOT_RUN;
447
448  // Note: don't use a Mutex to guard the entire before_exit(), as
449  // JVMTI post_thread_end_event and post_vm_death_event will run native code.
450  // A CAS or OSMutex would work just fine but then we need to manipulate
451  // thread state for Safepoint. Here we use Monitor wait() and notify_all()
452  // for synchronization.
453  { MutexLocker ml(BeforeExit_lock);
454    switch (_before_exit_status) {
455    case BEFORE_EXIT_NOT_RUN:
456      _before_exit_status = BEFORE_EXIT_RUNNING;
457      break;
458    case BEFORE_EXIT_RUNNING:
459      while (_before_exit_status == BEFORE_EXIT_RUNNING) {
460        BeforeExit_lock->wait();
461      }
462      assert(_before_exit_status == BEFORE_EXIT_DONE, "invalid state");
463      return;
464    case BEFORE_EXIT_DONE:
465      return;
466    }
467  }
468
469  // The only difference between this and Win32's _onexit procs is that
470  // this version is invoked before any threads get killed.
471  ExitProc* current = exit_procs;
472  while (current != NULL) {
473    ExitProc* next = current->next();
474    current->evaluate();
475    delete current;
476    current = next;
477  }
478
479  // Hang forever on exit if we're reporting an error.
480  if (ShowMessageBoxOnError && is_error_reported()) {
481    os::infinite_sleep();
482  }
483
484  // Terminate watcher thread - must before disenrolling any periodic task
485  if (PeriodicTask::num_tasks() > 0)
486    WatcherThread::stop();
487
488  // Print statistics gathered (profiling ...)
489  if (Arguments::has_profile()) {
490    FlatProfiler::disengage();
491    FlatProfiler::print(10);
492  }
493
494  // shut down the StatSampler task
495  StatSampler::disengage();
496  StatSampler::destroy();
497
498  // We do not need to explicitly stop concurrent GC threads because the
499  // JVM will be taken down at a safepoint when such threads are inactive --
500  // except for some concurrent G1 threads, see (comment in)
501  // Threads::destroy_vm().
502
503  // Print GC/heap related information.
504  if (PrintGCDetails) {
505    Universe::print();
506    AdaptiveSizePolicyOutput(0);
507    if (Verbose) {
508      ClassLoaderDataGraph::dump_on(gclog_or_tty);
509    }
510  }
511
512
513  if (Arguments::has_alloc_profile()) {
514    HandleMark hm;
515    // Do one last collection to enumerate all the objects
516    // allocated since the last one.
517    Universe::heap()->collect(GCCause::_allocation_profiler);
518    AllocationProfiler::disengage();
519    AllocationProfiler::print(0);
520  }
521
522  if (PrintBytecodeHistogram) {
523    BytecodeHistogram::print();
524  }
525
526  if (JvmtiExport::should_post_thread_life()) {
527    JvmtiExport::post_thread_end(thread);
528  }
529
530
531  EventThreadEnd event;
532  if (event.should_commit()) {
533      event.set_javalangthread(java_lang_Thread::thread_id(thread->threadObj()));
534      event.commit();
535  }
536
537  // Always call even when there are not JVMTI environments yet, since environments
538  // may be attached late and JVMTI must track phases of VM execution
539  JvmtiExport::post_vm_death();
540  Threads::shutdown_vm_agents();
541
542  // Terminate the signal thread
543  // Note: we don't wait until it actually dies.
544  os::terminate_signal_thread();
545
546  print_statistics();
547  Universe::heap()->print_tracing_info();
548
549  { MutexLocker ml(BeforeExit_lock);
550    _before_exit_status = BEFORE_EXIT_DONE;
551    BeforeExit_lock->notify_all();
552  }
553
554  // Shutdown NMT before exit. Otherwise,
555  // it will run into trouble when system destroys static variables.
556  MemTracker::shutdown(MemTracker::NMT_normal);
557
558  #undef BEFORE_EXIT_NOT_RUN
559  #undef BEFORE_EXIT_RUNNING
560  #undef BEFORE_EXIT_DONE
561}
562
563void vm_exit(int code) {
564  Thread* thread = ThreadLocalStorage::is_initialized() ?
565    ThreadLocalStorage::get_thread_slow() : NULL;
566  if (thread == NULL) {
567    // we have serious problems -- just exit
568    vm_direct_exit(code);
569  }
570
571  if (VMThread::vm_thread() != NULL) {
572    // Fire off a VM_Exit operation to bring VM to a safepoint and exit
573    VM_Exit op(code);
574    if (thread->is_Java_thread())
575      ((JavaThread*)thread)->set_thread_state(_thread_in_vm);
576    VMThread::execute(&op);
577    // should never reach here; but in case something wrong with VM Thread.
578    vm_direct_exit(code);
579  } else {
580    // VM thread is gone, just exit
581    vm_direct_exit(code);
582  }
583  ShouldNotReachHere();
584}
585
586void notify_vm_shutdown() {
587  // For now, just a dtrace probe.
588#ifndef USDT2
589  HS_DTRACE_PROBE(hotspot, vm__shutdown);
590  HS_DTRACE_WORKAROUND_TAIL_CALL_BUG();
591#else /* USDT2 */
592  HOTSPOT_VM_SHUTDOWN();
593#endif /* USDT2 */
594}
595
596void vm_direct_exit(int code) {
597  notify_vm_shutdown();
598  os::wait_for_keypress_at_exit();
599  ::exit(code);
600}
601
602void vm_perform_shutdown_actions() {
603  // Warning: do not call 'exit_globals()' here. All threads are still running.
604  // Calling 'exit_globals()' will disable thread-local-storage and cause all
605  // kinds of assertions to trigger in debug mode.
606  if (is_init_completed()) {
607    Thread* thread = ThreadLocalStorage::is_initialized() ?
608                     ThreadLocalStorage::get_thread_slow() : NULL;
609    if (thread != NULL && thread->is_Java_thread()) {
610      // We are leaving the VM, set state to native (in case any OS exit
611      // handlers call back to the VM)
612      JavaThread* jt = (JavaThread*)thread;
613      // Must always be walkable or have no last_Java_frame when in
614      // thread_in_native
615      jt->frame_anchor()->make_walkable(jt);
616      jt->set_thread_state(_thread_in_native);
617    }
618  }
619  notify_vm_shutdown();
620}
621
622void vm_shutdown()
623{
624  vm_perform_shutdown_actions();
625  os::wait_for_keypress_at_exit();
626  os::shutdown();
627}
628
629void vm_abort(bool dump_core) {
630  vm_perform_shutdown_actions();
631  os::wait_for_keypress_at_exit();
632  os::abort(dump_core);
633  ShouldNotReachHere();
634}
635
636void vm_notify_during_shutdown(const char* error, const char* message) {
637  if (error != NULL) {
638    tty->print_cr("Error occurred during initialization of VM");
639    tty->print("%s", error);
640    if (message != NULL) {
641      tty->print_cr(": %s", message);
642    }
643    else {
644      tty->cr();
645    }
646  }
647  if (ShowMessageBoxOnError && WizardMode) {
648    fatal("Error occurred during initialization of VM");
649  }
650}
651
652void vm_exit_during_initialization(Handle exception) {
653  tty->print_cr("Error occurred during initialization of VM");
654  // If there are exceptions on this thread it must be cleared
655  // first and here. Any future calls to EXCEPTION_MARK requires
656  // that no pending exceptions exist.
657  Thread *THREAD = Thread::current();
658  if (HAS_PENDING_EXCEPTION) {
659    CLEAR_PENDING_EXCEPTION;
660  }
661  java_lang_Throwable::print(exception, tty);
662  tty->cr();
663  java_lang_Throwable::print_stack_trace(exception(), tty);
664  tty->cr();
665  vm_notify_during_shutdown(NULL, NULL);
666
667  // Failure during initialization, we don't want to dump core
668  vm_abort(false);
669}
670
671void vm_exit_during_initialization(Symbol* ex, const char* message) {
672  ResourceMark rm;
673  vm_notify_during_shutdown(ex->as_C_string(), message);
674
675  // Failure during initialization, we don't want to dump core
676  vm_abort(false);
677}
678
679void vm_exit_during_initialization(const char* error, const char* message) {
680  vm_notify_during_shutdown(error, message);
681
682  // Failure during initialization, we don't want to dump core
683  vm_abort(false);
684}
685
686void vm_shutdown_during_initialization(const char* error, const char* message) {
687  vm_notify_during_shutdown(error, message);
688  vm_shutdown();
689}
690
691JDK_Version JDK_Version::_current;
692const char* JDK_Version::_runtime_name;
693const char* JDK_Version::_runtime_version;
694
695void JDK_Version::initialize() {
696  jdk_version_info info;
697  assert(!_current.is_valid(), "Don't initialize twice");
698
699  void *lib_handle = os::native_java_library();
700  jdk_version_info_fn_t func = CAST_TO_FN_PTR(jdk_version_info_fn_t,
701     os::dll_lookup(lib_handle, "JDK_GetVersionInfo0"));
702
703  if (func == NULL) {
704    // JDK older than 1.6
705    _current._partially_initialized = true;
706  } else {
707    (*func)(&info, sizeof(info));
708
709    int major = JDK_VERSION_MAJOR(info.jdk_version);
710    int minor = JDK_VERSION_MINOR(info.jdk_version);
711    int micro = JDK_VERSION_MICRO(info.jdk_version);
712    int build = JDK_VERSION_BUILD(info.jdk_version);
713    if (major == 1 && minor > 4) {
714      // We represent "1.5.0" as "5.0", but 1.4.2 as itself.
715      major = minor;
716      minor = micro;
717      micro = 0;
718    }
719    _current = JDK_Version(major, minor, micro, info.update_version,
720                           info.special_update_version, build,
721                           info.thread_park_blocker == 1,
722                           info.post_vm_init_hook_enabled == 1,
723                           info.pending_list_uses_discovered_field == 1);
724  }
725}
726
727void JDK_Version::fully_initialize(
728    uint8_t major, uint8_t minor, uint8_t micro, uint8_t update) {
729  // This is only called when current is less than 1.6 and we've gotten
730  // far enough in the initialization to determine the exact version.
731  assert(major < 6, "not needed for JDK version >= 6");
732  assert(is_partially_initialized(), "must not initialize");
733  if (major < 5) {
734    // JDK verison sequence: 1.2.x, 1.3.x, 1.4.x, 5.0.x, 6.0.x, etc.
735    micro = minor;
736    minor = major;
737    major = 1;
738  }
739  _current = JDK_Version(major, minor, micro, update);
740}
741
742void JDK_Version_init() {
743  JDK_Version::initialize();
744}
745
746static int64_t encode_jdk_version(const JDK_Version& v) {
747  return
748    ((int64_t)v.major_version()          << (BitsPerByte * 5)) |
749    ((int64_t)v.minor_version()          << (BitsPerByte * 4)) |
750    ((int64_t)v.micro_version()          << (BitsPerByte * 3)) |
751    ((int64_t)v.update_version()         << (BitsPerByte * 2)) |
752    ((int64_t)v.special_update_version() << (BitsPerByte * 1)) |
753    ((int64_t)v.build_number()           << (BitsPerByte * 0));
754}
755
756int JDK_Version::compare(const JDK_Version& other) const {
757  assert(is_valid() && other.is_valid(), "Invalid version (uninitialized?)");
758  if (!is_partially_initialized() && other.is_partially_initialized()) {
759    return -(other.compare(*this)); // flip the comparators
760  }
761  assert(!other.is_partially_initialized(), "Not initialized yet");
762  if (is_partially_initialized()) {
763    assert(other.major_version() >= 6,
764           "Invalid JDK version comparison during initialization");
765    return -1;
766  } else {
767    uint64_t e = encode_jdk_version(*this);
768    uint64_t o = encode_jdk_version(other);
769    return (e > o) ? 1 : ((e == o) ? 0 : -1);
770  }
771}
772
773void JDK_Version::to_string(char* buffer, size_t buflen) const {
774  size_t index = 0;
775  if (!is_valid()) {
776    jio_snprintf(buffer, buflen, "%s", "(uninitialized)");
777  } else if (is_partially_initialized()) {
778    jio_snprintf(buffer, buflen, "%s", "(uninitialized) pre-1.6.0");
779  } else {
780    index += jio_snprintf(
781        &buffer[index], buflen - index, "%d.%d", _major, _minor);
782    if (_micro > 0) {
783      index += jio_snprintf(&buffer[index], buflen - index, ".%d", _micro);
784    }
785    if (_update > 0) {
786      index += jio_snprintf(&buffer[index], buflen - index, "_%02d", _update);
787    }
788    if (_special > 0) {
789      index += jio_snprintf(&buffer[index], buflen - index, "%c", _special);
790    }
791    if (_build > 0) {
792      index += jio_snprintf(&buffer[index], buflen - index, "-b%02d", _build);
793    }
794  }
795}
796