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/arguments.hpp"
46 #include "runtime/biasedLocking.hpp"
47 #include "runtime/compilationPolicy.hpp"
48 #include "runtime/fprofiler.hpp"
49 #include "runtime/init.hpp"
50 #include "runtime/interfaceSupport.hpp"
51 #include "runtime/java.hpp"
52 #include "runtime/memprofiler.hpp"
53 #include "runtime/sharedRuntime.hpp"
54 #include "runtime/statSampler.hpp"
55 #include "runtime/task.hpp"
56 #include "runtime/thread.inline.hpp"
57 #include "runtime/timer.hpp"
58 #include "runtime/vm_operations.hpp"
59 #include "services/memReporter.hpp"
60 #include "services/memTracker.hpp"
61 #include "trace/tracing.hpp"
62 #include "utilities/dtrace.hpp"
63 #include "utilities/globalDefinitions.hpp"
64 #include "utilities/histogram.hpp"
65 #include "utilities/macros.hpp"
66 #include "utilities/vmError.hpp"
67 #ifdef TARGET_ARCH_x86
68 # include "vm_version_x86.hpp"
69 #endif
70 #ifdef TARGET_ARCH_sparc
71 # include "vm_version_sparc.hpp"
72 #endif
73 #ifdef TARGET_ARCH_zero
74 # include "vm_version_zero.hpp"
75 #endif
76 #ifdef TARGET_ARCH_arm
77 # include "vm_version_arm.hpp"
78 #endif
79 #ifdef TARGET_ARCH_ppc
80 # include "vm_version_ppc.hpp"
81 #endif
82 #if INCLUDE_ALL_GCS
83 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp"
84 #include "gc_implementation/parallelScavenge/psScavenge.hpp"
85 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp"
86 #endif // INCLUDE_ALL_GCS
87 #ifdef COMPILER1
88 #include "c1/c1_Compiler.hpp"
89 #include "c1/c1_Runtime1.hpp"
90 #endif
91 #ifdef COMPILER2
92 #include "code/compiledIC.hpp"
93 #include "compiler/methodLiveness.hpp"
94 #include "opto/compile.hpp"
95 #include "opto/indexSet.hpp"
96 #include "opto/runtime.hpp"
97 #endif
98
99 #ifndef USDT2
100 HS_DTRACE_PROBE_DECL(hotspot, vm__shutdown);
101 #endif /* !USDT2 */
102
103 #ifndef PRODUCT
104
105 // Statistics printing (method invocation histogram)
106
107 GrowableArray<Method*>* collected_invoked_methods;
108
109 void collect_invoked_methods(Method* m) {
110 if (m->invocation_count() + m->compiled_invocation_count() >= 1 ) {
111 collected_invoked_methods->push(m);
112 }
113 }
114
115
116 GrowableArray<Method*>* collected_profiled_methods;
117
118 void collect_profiled_methods(Method* m) {
119 Thread* thread = Thread::current();
120 // This HandleMark prevents a huge amount of handles from being added
121 // to the metadata_handles() array on the thread.
122 HandleMark hm(thread);
123 methodHandle mh(thread, m);
124 if ((m->method_data() != NULL) &&
125 (PrintMethodData || CompilerOracle::should_print(mh))) {
126 collected_profiled_methods->push(m);
127 }
128 }
129
130
131 int compare_methods(Method** a, Method** b) {
132 // %%% there can be 32-bit overflow here
133 return ((*b)->invocation_count() + (*b)->compiled_invocation_count())
134 - ((*a)->invocation_count() + (*a)->compiled_invocation_count());
135 }
136
137
138 void print_method_invocation_histogram() {
139 ResourceMark rm;
140 HandleMark hm;
141 collected_invoked_methods = new GrowableArray<Method*>(1024);
142 SystemDictionary::methods_do(collect_invoked_methods);
143 collected_invoked_methods->sort(&compare_methods);
144 //
145 tty->cr();
146 tty->print_cr("Histogram Over MethodOop Invocation Counters (cutoff = %d):", MethodHistogramCutoff);
147 tty->cr();
148 tty->print_cr("____Count_(I+C)____Method________________________Module_________________");
149 unsigned total = 0, int_total = 0, comp_total = 0, static_total = 0, final_total = 0,
150 synch_total = 0, nativ_total = 0, acces_total = 0;
151 for (int index = 0; index < collected_invoked_methods->length(); index++) {
152 Method* m = collected_invoked_methods->at(index);
153 int c = m->invocation_count() + m->compiled_invocation_count();
154 if (c >= MethodHistogramCutoff) m->print_invocation_count();
155 int_total += m->invocation_count();
156 comp_total += m->compiled_invocation_count();
157 if (m->is_final()) final_total += c;
158 if (m->is_static()) static_total += c;
159 if (m->is_synchronized()) synch_total += c;
160 if (m->is_native()) nativ_total += c;
161 if (m->is_accessor()) acces_total += c;
162 }
163 tty->cr();
164 total = int_total + comp_total;
165 tty->print_cr("Invocations summary:");
166 tty->print_cr("\t%9d (%4.1f%%) interpreted", int_total, 100.0 * int_total / total);
167 tty->print_cr("\t%9d (%4.1f%%) compiled", comp_total, 100.0 * comp_total / total);
168 tty->print_cr("\t%9d (100%%) total", total);
169 tty->print_cr("\t%9d (%4.1f%%) synchronized", synch_total, 100.0 * synch_total / total);
170 tty->print_cr("\t%9d (%4.1f%%) final", final_total, 100.0 * final_total / total);
171 tty->print_cr("\t%9d (%4.1f%%) static", static_total, 100.0 * static_total / total);
172 tty->print_cr("\t%9d (%4.1f%%) native", nativ_total, 100.0 * nativ_total / total);
173 tty->print_cr("\t%9d (%4.1f%%) accessor", acces_total, 100.0 * acces_total / total);
174 tty->cr();
175 SharedRuntime::print_call_statistics(comp_total);
176 }
177
178 void print_method_profiling_data() {
179 ResourceMark rm;
180 HandleMark hm;
181 collected_profiled_methods = new GrowableArray<Method*>(1024);
182 SystemDictionary::methods_do(collect_profiled_methods);
183 collected_profiled_methods->sort(&compare_methods);
184
185 int count = collected_profiled_methods->length();
186 if (count > 0) {
187 for (int index = 0; index < count; index++) {
188 Method* m = collected_profiled_methods->at(index);
189 ttyLocker ttyl;
190 tty->print_cr("------------------------------------------------------------------------");
191 //m->print_name(tty);
192 m->print_invocation_count();
193 tty->cr();
194 m->print_codes();
195 }
196 tty->print_cr("------------------------------------------------------------------------");
197 }
198 }
199
200 void print_bytecode_count() {
201 if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
202 tty->print_cr("[BytecodeCounter::counter_value = %d]", BytecodeCounter::counter_value());
203 }
204 }
205
206 AllocStats alloc_stats;
207
208
209
210 // General statistics printing (profiling ...)
211
212 void print_statistics() {
213
214 #ifdef ASSERT
215
216 if (CountRuntimeCalls) {
217 extern Histogram *RuntimeHistogram;
218 RuntimeHistogram->print();
219 }
220
221 if (CountJNICalls) {
222 extern Histogram *JNIHistogram;
223 JNIHistogram->print();
224 }
225
226 if (CountJVMCalls) {
227 extern Histogram *JVMHistogram;
228 JVMHistogram->print();
229 }
230
231 #endif
232
233 if (MemProfiling) {
234 MemProfiler::disengage();
235 }
236
237 if (CITime) {
238 CompileBroker::print_times();
239 }
240
241 #ifdef COMPILER1
242 if ((PrintC1Statistics || LogVMOutput || LogCompilation) && UseCompiler) {
243 FlagSetting fs(DisplayVMOutput, DisplayVMOutput && PrintC1Statistics);
244 Runtime1::print_statistics();
245 Deoptimization::print_statistics();
246 SharedRuntime::print_statistics();
247 nmethod::print_statistics();
248 }
249 #endif /* COMPILER1 */
250
251 #ifdef COMPILER2
252 if ((PrintOptoStatistics || LogVMOutput || LogCompilation) && UseCompiler) {
253 FlagSetting fs(DisplayVMOutput, DisplayVMOutput && PrintOptoStatistics);
254 Compile::print_statistics();
255 #ifndef COMPILER1
256 Deoptimization::print_statistics();
257 nmethod::print_statistics();
258 SharedRuntime::print_statistics();
259 #endif //COMPILER1
260 os::print_statistics();
261 }
262
263 if (PrintLockStatistics || PrintPreciseBiasedLockingStatistics) {
264 OptoRuntime::print_named_counters();
265 }
266
267 if (TimeLivenessAnalysis) {
268 MethodLiveness::print_times();
269 }
270 #ifdef ASSERT
271 if (CollectIndexSetStatistics) {
272 IndexSet::print_statistics();
273 }
274 #endif // ASSERT
275 #endif // COMPILER2
276 if (CountCompiledCalls) {
277 print_method_invocation_histogram();
278 }
279 if (ProfileInterpreter COMPILER1_PRESENT(|| C1UpdateMethodData)) {
280 print_method_profiling_data();
281 }
282 if (TimeCompiler) {
283 COMPILER2_PRESENT(Compile::print_timers();)
284 }
285 if (TimeCompilationPolicy) {
286 CompilationPolicy::policy()->print_time();
287 }
288 if (TimeOopMap) {
289 GenerateOopMap::print_time();
290 }
291 if (ProfilerCheckIntervals) {
292 PeriodicTask::print_intervals();
293 }
294 if (PrintSymbolTableSizeHistogram) {
295 SymbolTable::print_histogram();
296 }
297 if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
298 BytecodeCounter::print();
299 }
300 if (PrintBytecodePairHistogram) {
301 BytecodePairHistogram::print();
302 }
303
304 if (PrintCodeCache) {
305 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
306 CodeCache::print();
307 }
308
309 if (PrintCodeCache2) {
310 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
311 CodeCache::print_internals();
312 }
313
314 if (PrintClassStatistics) {
315 SystemDictionary::print_class_statistics();
316 }
317 if (PrintMethodStatistics) {
318 SystemDictionary::print_method_statistics();
319 }
320
321 if (PrintVtableStats) {
322 klassVtable::print_statistics();
323 klassItable::print_statistics();
324 }
325 if (VerifyOops) {
326 tty->print_cr("+VerifyOops count: %d", StubRoutines::verify_oop_count());
327 }
328
329 print_bytecode_count();
330 if (PrintMallocStatistics) {
331 tty->print("allocation stats: ");
332 alloc_stats.print();
333 tty->cr();
334 }
335
336 if (PrintSystemDictionaryAtExit) {
337 SystemDictionary::print();
338 }
339
340 if (PrintBiasedLockingStatistics) {
341 BiasedLocking::print_counters();
342 }
343
344 #ifdef ENABLE_ZAP_DEAD_LOCALS
345 #ifdef COMPILER2
346 if (ZapDeadCompiledLocals) {
347 tty->print_cr("Compile::CompiledZap_count = %d", Compile::CompiledZap_count);
348 tty->print_cr("OptoRuntime::ZapDeadCompiledLocals_count = %d", OptoRuntime::ZapDeadCompiledLocals_count);
349 }
350 #endif // COMPILER2
351 #endif // ENABLE_ZAP_DEAD_LOCALS
352 // Native memory tracking data
353 if (PrintNMTStatistics) {
354 if (MemTracker::is_on()) {
355 BaselineTTYOutputer outputer(tty);
356 MemTracker::print_memory_usage(outputer, K, false);
357 } else {
358 tty->print_cr(MemTracker::reason());
359 }
360 }
361 }
362
363 #else // PRODUCT MODE STATISTICS
364
365 void print_statistics() {
366
367 if (CITime) {
368 CompileBroker::print_times();
369 }
370
371 if (PrintCodeCache) {
372 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
373 CodeCache::print();
374 }
375
376 #ifdef COMPILER2
377 if (PrintPreciseBiasedLockingStatistics) {
378 OptoRuntime::print_named_counters();
379 }
380 #endif
381 if (PrintBiasedLockingStatistics) {
382 BiasedLocking::print_counters();
383 }
384
385 // Native memory tracking data
386 if (PrintNMTStatistics) {
387 if (MemTracker::is_on()) {
388 BaselineTTYOutputer outputer(tty);
389 MemTracker::print_memory_usage(outputer, K, false);
390 } else {
391 tty->print_cr(MemTracker::reason());
392 }
393 }
394 }
395
396 #endif
397
398
399 // Helper class for registering on_exit calls through JVM_OnExit
400
401 extern "C" {
402 typedef void (*__exit_proc)(void);
403 }
404
405 class ExitProc : public CHeapObj<mtInternal> {
406 private:
407 __exit_proc _proc;
408 // void (*_proc)(void);
409 ExitProc* _next;
410 public:
411 // ExitProc(void (*proc)(void)) {
412 ExitProc(__exit_proc proc) {
413 _proc = proc;
414 _next = NULL;
415 }
416 void evaluate() { _proc(); }
417 ExitProc* next() const { return _next; }
418 void set_next(ExitProc* next) { _next = next; }
419 };
420
421
422 // Linked list of registered on_exit procedures
423
424 static ExitProc* exit_procs = NULL;
425
426
427 extern "C" {
428 void register_on_exit_function(void (*func)(void)) {
429 ExitProc *entry = new ExitProc(func);
430 // Classic vm does not throw an exception in case the allocation failed,
431 if (entry != NULL) {
432 entry->set_next(exit_procs);
433 exit_procs = entry;
434 }
435 }
436 }
437
438 // Note: before_exit() can be executed only once, if more than one threads
439 // are trying to shutdown the VM at the same time, only one thread
440 // can run before_exit() and all other threads must wait.
441 void before_exit(JavaThread * thread) {
442 #define BEFORE_EXIT_NOT_RUN 0
443 #define BEFORE_EXIT_RUNNING 1
444 #define BEFORE_EXIT_DONE 2
445 static jint volatile _before_exit_status = BEFORE_EXIT_NOT_RUN;
446
447 // Note: don't use a Mutex to guard the entire before_exit(), as
448 // JVMTI post_thread_end_event and post_vm_death_event will run native code.
449 // A CAS or OSMutex would work just fine but then we need to manipulate
450 // thread state for Safepoint. Here we use Monitor wait() and notify_all()
451 // for synchronization.
452 { MutexLocker ml(BeforeExit_lock);
453 switch (_before_exit_status) {
454 case BEFORE_EXIT_NOT_RUN:
455 _before_exit_status = BEFORE_EXIT_RUNNING;
456 break;
457 case BEFORE_EXIT_RUNNING:
458 while (_before_exit_status == BEFORE_EXIT_RUNNING) {
459 BeforeExit_lock->wait();
460 }
461 assert(_before_exit_status == BEFORE_EXIT_DONE, "invalid state");
462 return;
463 case BEFORE_EXIT_DONE:
464 return;
465 }
466 }
467
468 // The only difference between this and Win32's _onexit procs is that
469 // this version is invoked before any threads get killed.
470 ExitProc* current = exit_procs;
471 while (current != NULL) {
472 ExitProc* next = current->next();
473 current->evaluate();
474 delete current;
475 current = next;
476 }
477
478 // Hang forever on exit if we're reporting an error.
479 if (ShowMessageBoxOnError && is_error_reported()) {
480 os::infinite_sleep();
481 }
482
483 // Terminate watcher thread - must before disenrolling any periodic task
484 if (PeriodicTask::num_tasks() > 0)
485 WatcherThread::stop();
486
487 // Print statistics gathered (profiling ...)
488 if (Arguments::has_profile()) {
489 FlatProfiler::disengage();
490 FlatProfiler::print(10);
491 }
492
493 // shut down the StatSampler task
494 StatSampler::disengage();
495 StatSampler::destroy();
496
497 // We do not need to explicitly stop concurrent GC threads because the
498 // JVM will be taken down at a safepoint when such threads are inactive --
499 // except for some concurrent G1 threads, see (comment in)
500 // Threads::destroy_vm().
501
502 // Print GC/heap related information.
503 if (PrintGCDetails) {
504 Universe::print();
505 AdaptiveSizePolicyOutput(0);
506 if (Verbose) {
507 ClassLoaderDataGraph::dump_on(gclog_or_tty);
508 }
509 }
510
511 if (PrintBytecodeHistogram) {
512 BytecodeHistogram::print();
513 }
514
515 if (JvmtiExport::should_post_thread_life()) {
516 JvmtiExport::post_thread_end(thread);
517 }
518
519
520 EventThreadEnd event;
521 if (event.should_commit()) {
522 event.set_javalangthread(java_lang_Thread::thread_id(thread->threadObj()));
523 event.commit();
524 }
525
526 // Always call even when there are not JVMTI environments yet, since environments
527 // may be attached late and JVMTI must track phases of VM execution
528 JvmtiExport::post_vm_death();
529 Threads::shutdown_vm_agents();
530
531 // Terminate the signal thread
532 // Note: we don't wait until it actually dies.
533 os::terminate_signal_thread();
534
535 print_statistics();
536 Universe::heap()->print_tracing_info();
537
538 { MutexLocker ml(BeforeExit_lock);
539 _before_exit_status = BEFORE_EXIT_DONE;
540 BeforeExit_lock->notify_all();
541 }
542
543 // Shutdown NMT before exit. Otherwise,
544 // it will run into trouble when system destroys static variables.
545 MemTracker::shutdown(MemTracker::NMT_normal);
546
547 #undef BEFORE_EXIT_NOT_RUN
548 #undef BEFORE_EXIT_RUNNING
549 #undef BEFORE_EXIT_DONE
550 }
551
552 void vm_exit(int code) {
553 Thread* thread = ThreadLocalStorage::is_initialized() ?
554 ThreadLocalStorage::get_thread_slow() : NULL;
555 if (thread == NULL) {
556 // we have serious problems -- just exit
557 vm_direct_exit(code);
558 }
559
560 if (VMThread::vm_thread() != NULL) {
561 // Fire off a VM_Exit operation to bring VM to a safepoint and exit
562 VM_Exit op(code);
563 if (thread->is_Java_thread())
564 ((JavaThread*)thread)->set_thread_state(_thread_in_vm);
565 VMThread::execute(&op);
566 // should never reach here; but in case something wrong with VM Thread.
567 vm_direct_exit(code);
568 } else {
569 // VM thread is gone, just exit
570 vm_direct_exit(code);
571 }
572 ShouldNotReachHere();
573 }
574
575 void notify_vm_shutdown() {
576 // For now, just a dtrace probe.
577 #ifndef USDT2
578 HS_DTRACE_PROBE(hotspot, vm__shutdown);
579 HS_DTRACE_WORKAROUND_TAIL_CALL_BUG();
580 #else /* USDT2 */
581 HOTSPOT_VM_SHUTDOWN();
582 #endif /* USDT2 */
583 }
584
585 void vm_direct_exit(int code) {
586 notify_vm_shutdown();
587 os::wait_for_keypress_at_exit();
588 ::exit(code);
589 }
590
591 void vm_perform_shutdown_actions() {
592 // Warning: do not call 'exit_globals()' here. All threads are still running.
593 // Calling 'exit_globals()' will disable thread-local-storage and cause all
594 // kinds of assertions to trigger in debug mode.
595 if (is_init_completed()) {
596 Thread* thread = ThreadLocalStorage::is_initialized() ?
597 ThreadLocalStorage::get_thread_slow() : NULL;
598 if (thread != NULL && thread->is_Java_thread()) {
599 // We are leaving the VM, set state to native (in case any OS exit
600 // handlers call back to the VM)
601 JavaThread* jt = (JavaThread*)thread;
602 // Must always be walkable or have no last_Java_frame when in
603 // thread_in_native
604 jt->frame_anchor()->make_walkable(jt);
605 jt->set_thread_state(_thread_in_native);
606 }
607 }
608 notify_vm_shutdown();
609 }
610
611 void vm_shutdown()
612 {
613 vm_perform_shutdown_actions();
614 os::wait_for_keypress_at_exit();
615 os::shutdown();
616 }
617
618 void vm_abort(bool dump_core) {
619 vm_perform_shutdown_actions();
620 os::wait_for_keypress_at_exit();
621 os::abort(dump_core);
622 ShouldNotReachHere();
623 }
624
625 void vm_notify_during_shutdown(const char* error, const char* message) {
626 if (error != NULL) {
627 tty->print_cr("Error occurred during initialization of VM");
628 tty->print("%s", error);
629 if (message != NULL) {
630 tty->print_cr(": %s", message);
631 }
632 else {
633 tty->cr();
634 }
635 }
636 if (ShowMessageBoxOnError && WizardMode) {
637 fatal("Error occurred during initialization of VM");
638 }
639 }
640
641 void vm_exit_during_initialization(Handle exception) {
642 tty->print_cr("Error occurred during initialization of VM");
643 // If there are exceptions on this thread it must be cleared
644 // first and here. Any future calls to EXCEPTION_MARK requires
645 // that no pending exceptions exist.
646 Thread *THREAD = Thread::current();
647 if (HAS_PENDING_EXCEPTION) {
648 CLEAR_PENDING_EXCEPTION;
649 }
650 java_lang_Throwable::print(exception, tty);
651 tty->cr();
652 java_lang_Throwable::print_stack_trace(exception(), tty);
653 tty->cr();
654 vm_notify_during_shutdown(NULL, NULL);
655
656 // Failure during initialization, we don't want to dump core
657 vm_abort(false);
658 }
659
660 void vm_exit_during_initialization(Symbol* ex, const char* message) {
661 ResourceMark rm;
662 vm_notify_during_shutdown(ex->as_C_string(), message);
663
664 // Failure during initialization, we don't want to dump core
665 vm_abort(false);
666 }
667
668 void vm_exit_during_initialization(const char* error, const char* message) {
669 vm_notify_during_shutdown(error, message);
670
671 // Failure during initialization, we don't want to dump core
672 vm_abort(false);
673 }
674
675 void vm_shutdown_during_initialization(const char* error, const char* message) {
676 vm_notify_during_shutdown(error, message);
677 vm_shutdown();
678 }
679
680 JDK_Version JDK_Version::_current;
681 const char* JDK_Version::_runtime_name;
682 const char* JDK_Version::_runtime_version;
683
684 void JDK_Version::initialize() {
685 jdk_version_info info;
686 assert(!_current.is_valid(), "Don't initialize twice");
687
688 void *lib_handle = os::native_java_library();
689 jdk_version_info_fn_t func = CAST_TO_FN_PTR(jdk_version_info_fn_t,
690 os::dll_lookup(lib_handle, "JDK_GetVersionInfo0"));
691
692 if (func == NULL) {
693 // JDK older than 1.6
694 _current._partially_initialized = true;
695 } else {
696 (*func)(&info, sizeof(info));
697
698 int major = JDK_VERSION_MAJOR(info.jdk_version);
699 int minor = JDK_VERSION_MINOR(info.jdk_version);
700 int micro = JDK_VERSION_MICRO(info.jdk_version);
701 int build = JDK_VERSION_BUILD(info.jdk_version);
702 if (major == 1 && minor > 4) {
703 // We represent "1.5.0" as "5.0", but 1.4.2 as itself.
704 major = minor;
705 minor = micro;
706 micro = 0;
707 }
708 _current = JDK_Version(major, minor, micro, info.update_version,
709 info.special_update_version, build,
710 info.thread_park_blocker == 1,
711 info.post_vm_init_hook_enabled == 1,
712 info.pending_list_uses_discovered_field == 1);
713 }
714 }
715
716 void JDK_Version::fully_initialize(
717 uint8_t major, uint8_t minor, uint8_t micro, uint8_t update) {
718 // This is only called when current is less than 1.6 and we've gotten
719 // far enough in the initialization to determine the exact version.
720 assert(major < 6, "not needed for JDK version >= 6");
721 assert(is_partially_initialized(), "must not initialize");
722 if (major < 5) {
723 // JDK verison sequence: 1.2.x, 1.3.x, 1.4.x, 5.0.x, 6.0.x, etc.
724 micro = minor;
725 minor = major;
726 major = 1;
727 }
728 _current = JDK_Version(major, minor, micro, update);
729 }
730
731 void JDK_Version_init() {
732 JDK_Version::initialize();
733 }
734
735 static int64_t encode_jdk_version(const JDK_Version& v) {
736 return
737 ((int64_t)v.major_version() << (BitsPerByte * 5)) |
738 ((int64_t)v.minor_version() << (BitsPerByte * 4)) |
739 ((int64_t)v.micro_version() << (BitsPerByte * 3)) |
740 ((int64_t)v.update_version() << (BitsPerByte * 2)) |
741 ((int64_t)v.special_update_version() << (BitsPerByte * 1)) |
742 ((int64_t)v.build_number() << (BitsPerByte * 0));
743 }
744
745 int JDK_Version::compare(const JDK_Version& other) const {
746 assert(is_valid() && other.is_valid(), "Invalid version (uninitialized?)");
747 if (!is_partially_initialized() && other.is_partially_initialized()) {
748 return -(other.compare(*this)); // flip the comparators
749 }
750 assert(!other.is_partially_initialized(), "Not initialized yet");
751 if (is_partially_initialized()) {
752 assert(other.major_version() >= 6,
753 "Invalid JDK version comparison during initialization");
754 return -1;
755 } else {
756 uint64_t e = encode_jdk_version(*this);
757 uint64_t o = encode_jdk_version(other);
758 return (e > o) ? 1 : ((e == o) ? 0 : -1);
759 }
760 }
761
762 void JDK_Version::to_string(char* buffer, size_t buflen) const {
763 size_t index = 0;
764 if (!is_valid()) {
765 jio_snprintf(buffer, buflen, "%s", "(uninitialized)");
766 } else if (is_partially_initialized()) {
767 jio_snprintf(buffer, buflen, "%s", "(uninitialized) pre-1.6.0");
768 } else {
769 index += jio_snprintf(
770 &buffer[index], buflen - index, "%d.%d", _major, _minor);
771 if (_micro > 0) {
772 index += jio_snprintf(&buffer[index], buflen - index, ".%d", _micro);
773 }
774 if (_update > 0) {
775 index += jio_snprintf(&buffer[index], buflen - index, "_%02d", _update);
776 }
777 if (_special > 0) {
778 index += jio_snprintf(&buffer[index], buflen - index, "%c", _special);
779 }
780 if (_build > 0) {
781 index += jio_snprintf(&buffer[index], buflen - index, "-b%02d", _build);
782 }
783 }
784 }