1 /*
2 * Copyright (c) 1997, 2014, 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/stringTable.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/sweeper.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/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 #if INCLUDE_ALL_GCS
68 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp"
69 #include "gc_implementation/parallelScavenge/psScavenge.hpp"
70 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp"
71 #endif // INCLUDE_ALL_GCS
72 #ifdef COMPILER1
73 #include "c1/c1_Compiler.hpp"
74 #include "c1/c1_Runtime1.hpp"
75 #endif
76 #ifdef COMPILER2
77 #include "code/compiledIC.hpp"
78 #include "compiler/methodLiveness.hpp"
79 #include "opto/compile.hpp"
80 #include "opto/indexSet.hpp"
81 #include "opto/runtime.hpp"
82 #endif
83
84 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
85
86 GrowableArray<Method*>* collected_profiled_methods;
87
88 int compare_methods(Method** a, Method** b) {
89 // %%% there can be 32-bit overflow here
90 return ((*b)->invocation_count() + (*b)->compiled_invocation_count())
91 - ((*a)->invocation_count() + (*a)->compiled_invocation_count());
92 }
93
94 void collect_profiled_methods(Method* m) {
95 Thread* thread = Thread::current();
96 // This HandleMark prevents a huge amount of handles from being added
97 // to the metadata_handles() array on the thread.
98 HandleMark hm(thread);
99 methodHandle mh(thread, m);
100 if ((m->method_data() != NULL) &&
101 (PrintMethodData || CompilerOracle::should_print(mh))) {
102 collected_profiled_methods->push(m);
103 }
104 }
105
106 void print_method_profiling_data() {
107 if (ProfileInterpreter COMPILER1_PRESENT(|| C1UpdateMethodData) &&
108 (PrintMethodData || CompilerOracle::should_print_methods())) {
109 ResourceMark rm;
110 HandleMark hm;
111 collected_profiled_methods = new GrowableArray<Method*>(1024);
112 ClassLoaderDataGraph::methods_do(collect_profiled_methods);
113 collected_profiled_methods->sort(&compare_methods);
114
115 int count = collected_profiled_methods->length();
116 int total_size = 0;
117 if (count > 0) {
118 for (int index = 0; index < count; index++) {
119 Method* m = collected_profiled_methods->at(index);
120 ttyLocker ttyl;
121 tty->print_cr("------------------------------------------------------------------------");
122 m->print_invocation_count();
123 tty->print_cr(" mdo size: %d bytes", m->method_data()->size_in_bytes());
124 tty->cr();
125 // Dump data on parameters if any
126 if (m->method_data() != NULL && m->method_data()->parameters_type_data() != NULL) {
127 tty->fill_to(2);
128 m->method_data()->parameters_type_data()->print_data_on(tty);
129 }
130 m->print_codes();
131 total_size += m->method_data()->size_in_bytes();
132 }
133 tty->print_cr("------------------------------------------------------------------------");
134 tty->print_cr("Total MDO size: %d bytes", total_size);
135 }
136 }
137 }
138
139
140 #ifndef PRODUCT
141
142 // Statistics printing (method invocation histogram)
143
144 GrowableArray<Method*>* collected_invoked_methods;
145
146 void collect_invoked_methods(Method* m) {
147 if (m->invocation_count() + m->compiled_invocation_count() >= 1 ) {
148 collected_invoked_methods->push(m);
149 }
150 }
151
152
153
154
155 void print_method_invocation_histogram() {
156 ResourceMark rm;
157 HandleMark hm;
158 collected_invoked_methods = new GrowableArray<Method*>(1024);
159 SystemDictionary::methods_do(collect_invoked_methods);
160 collected_invoked_methods->sort(&compare_methods);
161 //
162 tty->cr();
163 tty->print_cr("Histogram Over MethodOop Invocation Counters (cutoff = %d):", MethodHistogramCutoff);
164 tty->cr();
165 tty->print_cr("____Count_(I+C)____Method________________________Module_________________");
166 unsigned total = 0, int_total = 0, comp_total = 0, static_total = 0, final_total = 0,
167 synch_total = 0, nativ_total = 0, acces_total = 0;
168 for (int index = 0; index < collected_invoked_methods->length(); index++) {
169 Method* m = collected_invoked_methods->at(index);
170 int c = m->invocation_count() + m->compiled_invocation_count();
171 if (c >= MethodHistogramCutoff) m->print_invocation_count();
172 int_total += m->invocation_count();
173 comp_total += m->compiled_invocation_count();
174 if (m->is_final()) final_total += c;
175 if (m->is_static()) static_total += c;
176 if (m->is_synchronized()) synch_total += c;
177 if (m->is_native()) nativ_total += c;
178 if (m->is_accessor()) acces_total += c;
179 }
180 tty->cr();
181 total = int_total + comp_total;
182 tty->print_cr("Invocations summary:");
183 tty->print_cr("\t%9d (%4.1f%%) interpreted", int_total, 100.0 * int_total / total);
184 tty->print_cr("\t%9d (%4.1f%%) compiled", comp_total, 100.0 * comp_total / total);
185 tty->print_cr("\t%9d (100%%) total", total);
186 tty->print_cr("\t%9d (%4.1f%%) synchronized", synch_total, 100.0 * synch_total / total);
187 tty->print_cr("\t%9d (%4.1f%%) final", final_total, 100.0 * final_total / total);
188 tty->print_cr("\t%9d (%4.1f%%) static", static_total, 100.0 * static_total / total);
189 tty->print_cr("\t%9d (%4.1f%%) native", nativ_total, 100.0 * nativ_total / total);
190 tty->print_cr("\t%9d (%4.1f%%) accessor", acces_total, 100.0 * acces_total / total);
191 tty->cr();
192 SharedRuntime::print_call_statistics(comp_total);
193 }
194
195 void print_bytecode_count() {
196 if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
197 tty->print_cr("[BytecodeCounter::counter_value = %d]", BytecodeCounter::counter_value());
198 }
199 }
200
201 AllocStats alloc_stats;
202
203
204
205 // General statistics printing (profiling ...)
206 void print_statistics() {
207 #ifdef ASSERT
208
209 if (CountRuntimeCalls) {
210 extern Histogram *RuntimeHistogram;
211 RuntimeHistogram->print();
212 }
213
214 if (CountJNICalls) {
215 extern Histogram *JNIHistogram;
216 JNIHistogram->print();
217 }
218
219 if (CountJVMCalls) {
220 extern Histogram *JVMHistogram;
221 JVMHistogram->print();
222 }
223
224 #endif
225
226 if (MemProfiling) {
227 MemProfiler::disengage();
228 }
229
230 if (CITime) {
231 CompileBroker::print_times();
232 }
233
234 #ifdef COMPILER1
235 if ((PrintC1Statistics || LogVMOutput || LogCompilation) && UseCompiler) {
236 FlagSetting fs(DisplayVMOutput, DisplayVMOutput && PrintC1Statistics);
237 Runtime1::print_statistics();
238 Deoptimization::print_statistics();
239 SharedRuntime::print_statistics();
240 nmethod::print_statistics();
241 }
242 #endif /* COMPILER1 */
243
244 #ifdef COMPILER2
245 if ((PrintOptoStatistics || LogVMOutput || LogCompilation) && UseCompiler) {
246 FlagSetting fs(DisplayVMOutput, DisplayVMOutput && PrintOptoStatistics);
247 Compile::print_statistics();
248 #ifndef COMPILER1
249 Deoptimization::print_statistics();
250 nmethod::print_statistics();
251 SharedRuntime::print_statistics();
252 #endif //COMPILER1
253 os::print_statistics();
254 }
255
256 if (PrintLockStatistics || PrintPreciseBiasedLockingStatistics || PrintPreciseRTMLockingStatistics) {
257 OptoRuntime::print_named_counters();
258 }
259
260 if (TimeLivenessAnalysis) {
261 MethodLiveness::print_times();
262 }
263 #ifdef ASSERT
264 if (CollectIndexSetStatistics) {
265 IndexSet::print_statistics();
266 }
267 #endif // ASSERT
268 #endif // COMPILER2
269 if (CountCompiledCalls) {
270 print_method_invocation_histogram();
271 }
272
273 print_method_profiling_data();
274
275 if (TimeCompiler) {
276 COMPILER2_PRESENT(Compile::print_timers();)
277 }
278 if (TimeCompilationPolicy) {
279 CompilationPolicy::policy()->print_time();
280 }
281 if (TimeOopMap) {
282 GenerateOopMap::print_time();
283 }
284 if (ProfilerCheckIntervals) {
285 PeriodicTask::print_intervals();
286 }
287 if (PrintSymbolTableSizeHistogram) {
288 SymbolTable::print_histogram();
289 }
290 if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
291 BytecodeCounter::print();
292 }
293 if (PrintBytecodePairHistogram) {
294 BytecodePairHistogram::print();
295 }
296
297 if (PrintCodeCache) {
298 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
299 CodeCache::print();
300 }
301
302 if (PrintMethodFlushingStatistics) {
303 NMethodSweeper::print();
304 }
305
306 if (PrintCodeCache2) {
307 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
308 CodeCache::print_internals();
309 }
310
311 if (PrintClassStatistics) {
312 SystemDictionary::print_class_statistics();
313 }
314 if (PrintMethodStatistics) {
315 SystemDictionary::print_method_statistics();
316 }
317
318 if (PrintVtableStats) {
319 klassVtable::print_statistics();
320 klassItable::print_statistics();
321 }
322 if (VerifyOops) {
323 tty->print_cr("+VerifyOops count: %d", StubRoutines::verify_oop_count());
324 }
325
326 print_bytecode_count();
327 if (PrintMallocStatistics) {
328 tty->print("allocation stats: ");
329 alloc_stats.print();
330 tty->cr();
331 }
332
333 if (PrintSystemDictionaryAtExit) {
334 SystemDictionary::print();
335 }
336
337 if (PrintBiasedLockingStatistics) {
338 BiasedLocking::print_counters();
339 }
340
341 #ifdef ENABLE_ZAP_DEAD_LOCALS
342 #ifdef COMPILER2
343 if (ZapDeadCompiledLocals) {
344 tty->print_cr("Compile::CompiledZap_count = %d", Compile::CompiledZap_count);
345 tty->print_cr("OptoRuntime::ZapDeadCompiledLocals_count = %d", OptoRuntime::ZapDeadCompiledLocals_count);
346 }
347 #endif // COMPILER2
348 #endif // ENABLE_ZAP_DEAD_LOCALS
349 // Native memory tracking data
350 if (PrintNMTStatistics) {
351 MemTracker::final_report(tty);
352 }
353 }
354
355 #else // PRODUCT MODE STATISTICS
356
357 void print_statistics() {
358
359 if (PrintMethodData) {
360 print_method_profiling_data();
361 }
362
363 if (CITime) {
364 CompileBroker::print_times();
365 }
366
367 if (PrintCodeCache) {
368 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
369 CodeCache::print();
370 }
371
372 if (PrintMethodFlushingStatistics) {
373 NMethodSweeper::print();
374 }
375
376 #ifdef COMPILER2
377 if (PrintPreciseBiasedLockingStatistics || PrintPreciseRTMLockingStatistics) {
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 MemTracker::final_report(tty);
388 }
389 }
390
391 #endif
392
393
394 // Helper class for registering on_exit calls through JVM_OnExit
395
396 extern "C" {
397 typedef void (*__exit_proc)(void);
398 }
399
400 class ExitProc : public CHeapObj<mtInternal> {
401 private:
402 __exit_proc _proc;
403 // void (*_proc)(void);
404 ExitProc* _next;
405 public:
406 // ExitProc(void (*proc)(void)) {
407 ExitProc(__exit_proc proc) {
408 _proc = proc;
409 _next = NULL;
410 }
411 void evaluate() { _proc(); }
412 ExitProc* next() const { return _next; }
413 void set_next(ExitProc* next) { _next = next; }
414 };
415
416
417 // Linked list of registered on_exit procedures
418
419 static ExitProc* exit_procs = NULL;
420
421
422 extern "C" {
423 void register_on_exit_function(void (*func)(void)) {
424 ExitProc *entry = new ExitProc(func);
425 // Classic vm does not throw an exception in case the allocation failed,
426 if (entry != NULL) {
427 entry->set_next(exit_procs);
428 exit_procs = entry;
429 }
430 }
431 }
432
433 jint volatile vm_getting_terminated = 0;
434
435 // Note: before_exit() can be executed only once, if more than one threads
436 // are trying to shutdown the VM at the same time, only one thread
437 // can run before_exit() and all other threads must wait.
438 void before_exit(JavaThread * thread) {
439 #define BEFORE_EXIT_NOT_RUN 0
440 #define BEFORE_EXIT_RUNNING 1
441 #define BEFORE_EXIT_DONE 2
442 static jint volatile _before_exit_status = BEFORE_EXIT_NOT_RUN;
443
444 // Note: don't use a Mutex to guard the entire before_exit(), as
445 // JVMTI post_thread_end_event and post_vm_death_event will run native code.
446 // A CAS or OSMutex would work just fine but then we need to manipulate
447 // thread state for Safepoint. Here we use Monitor wait() and notify_all()
448 // for synchronization.
449 { MutexLocker ml(BeforeExit_lock);
450 switch (_before_exit_status) {
451 case BEFORE_EXIT_NOT_RUN:
452 _before_exit_status = BEFORE_EXIT_RUNNING;
453 break;
454 case BEFORE_EXIT_RUNNING:
455 while (_before_exit_status == BEFORE_EXIT_RUNNING) {
456 BeforeExit_lock->wait();
457 }
458 assert(_before_exit_status == BEFORE_EXIT_DONE, "invalid state");
459 return;
460 case BEFORE_EXIT_DONE:
461 return;
462 }
463 }
464
465 OrderAccess::release_store(&vm_getting_terminated, 1);
466
467 // The only difference between this and Win32's _onexit procs is that
468 // this version is invoked before any threads get killed.
469 ExitProc* current = exit_procs;
470 while (current != NULL) {
471 ExitProc* next = current->next();
472 current->evaluate();
473 delete current;
474 current = next;
475 }
476
477 // Hang forever on exit if we're reporting an error.
478 if (ShowMessageBoxOnError && is_error_reported()) {
479 os::infinite_sleep();
480 }
481
482 // Terminate watcher thread - must before disenrolling any periodic task
483 if (PeriodicTask::num_tasks() > 0)
484 WatcherThread::stop();
485
486 // Print statistics gathered (profiling ...)
487 if (Arguments::has_profile()) {
488 FlatProfiler::disengage();
489 FlatProfiler::print(10);
490 }
491
492 // shut down the StatSampler task
493 StatSampler::disengage();
494 StatSampler::destroy();
495
496 // Stop concurrent GC threads
497 Universe::heap()->stop();
498
499 // Print GC/heap related information.
500 if (PrintGCDetails) {
501 Universe::print();
502 AdaptiveSizePolicyOutput(0);
503 if (Verbose) {
504 ClassLoaderDataGraph::dump_on(gclog_or_tty);
505 }
506 }
507
508 if (PrintBytecodeHistogram) {
509 BytecodeHistogram::print();
510 }
511
512 if (JvmtiExport::should_post_thread_life()) {
513 JvmtiExport::post_thread_end(thread);
514 }
515
516
517 EventThreadEnd event;
518 if (event.should_commit()) {
519 event.set_javalangthread(java_lang_Thread::thread_id(thread->threadObj()));
520 event.commit();
521 }
522
523 // Always call even when there are not JVMTI environments yet, since environments
524 // may be attached late and JVMTI must track phases of VM execution
525 JvmtiExport::post_vm_death();
526 Threads::shutdown_vm_agents();
527
528 // Terminate the signal thread
529 // Note: we don't wait until it actually dies.
530 os::terminate_signal_thread();
531
532 print_statistics();
533 Universe::heap()->print_tracing_info();
534
535 { MutexLocker ml(BeforeExit_lock);
536 _before_exit_status = BEFORE_EXIT_DONE;
537 BeforeExit_lock->notify_all();
538 }
539
540 if (VerifyStringTableAtExit) {
541 int fail_cnt = 0;
542 {
543 MutexLocker ml(StringTable_lock);
544 fail_cnt = StringTable::verify_and_compare_entries();
545 }
546
547 if (fail_cnt != 0) {
548 tty->print_cr("ERROR: fail_cnt=%d", fail_cnt);
549 guarantee(fail_cnt == 0, "unexpected StringTable verification failures");
550 }
551 }
552
553 #undef BEFORE_EXIT_NOT_RUN
554 #undef BEFORE_EXIT_RUNNING
555 #undef BEFORE_EXIT_DONE
556 }
557
558 void vm_exit(int code) {
559 Thread* thread = ThreadLocalStorage::is_initialized() ?
560 ThreadLocalStorage::get_thread_slow() : NULL;
561 if (thread == NULL) {
562 // we have serious problems -- just exit
563 vm_direct_exit(code);
564 }
565
566 if (VMThread::vm_thread() != NULL) {
567 // Fire off a VM_Exit operation to bring VM to a safepoint and exit
568 VM_Exit op(code);
569 if (thread->is_Java_thread())
570 ((JavaThread*)thread)->set_thread_state(_thread_in_vm);
571 VMThread::execute(&op);
572 // should never reach here; but in case something wrong with VM Thread.
573 vm_direct_exit(code);
574 } else {
575 // VM thread is gone, just exit
576 vm_direct_exit(code);
577 }
578 ShouldNotReachHere();
579 }
580
581 void notify_vm_shutdown() {
582 // For now, just a dtrace probe.
583 HOTSPOT_VM_SHUTDOWN();
584 HS_DTRACE_WORKAROUND_TAIL_CALL_BUG();
585 }
586
587 void vm_direct_exit(int code) {
588 notify_vm_shutdown();
589 os::wait_for_keypress_at_exit();
590 ::exit(code);
591 }
592
593 void vm_perform_shutdown_actions() {
594 // Warning: do not call 'exit_globals()' here. All threads are still running.
595 // Calling 'exit_globals()' will disable thread-local-storage and cause all
596 // kinds of assertions to trigger in debug mode.
597 if (is_init_completed()) {
598 Thread* thread = ThreadLocalStorage::is_initialized() ?
599 ThreadLocalStorage::get_thread_slow() : NULL;
600 if (thread != NULL && thread->is_Java_thread()) {
601 // We are leaving the VM, set state to native (in case any OS exit
602 // handlers call back to the VM)
603 JavaThread* jt = (JavaThread*)thread;
604 // Must always be walkable or have no last_Java_frame when in
605 // thread_in_native
606 jt->frame_anchor()->make_walkable(jt);
607 jt->set_thread_state(_thread_in_native);
608 }
609 }
610 notify_vm_shutdown();
611 }
612
613 void vm_shutdown()
614 {
615 vm_perform_shutdown_actions();
616 os::wait_for_keypress_at_exit();
617 os::shutdown();
618 }
619
620 void vm_abort(bool dump_core) {
621 vm_perform_shutdown_actions();
622 os::wait_for_keypress_at_exit();
623 os::abort(dump_core);
624 ShouldNotReachHere();
625 }
626
627 void vm_notify_during_shutdown(const char* error, const char* message) {
628 if (error != NULL) {
629 tty->print_cr("Error occurred during initialization of VM");
630 tty->print("%s", error);
631 if (message != NULL) {
632 tty->print_cr(": %s", message);
633 }
634 else {
635 tty->cr();
636 }
637 }
638 if (ShowMessageBoxOnError && WizardMode) {
639 fatal("Error occurred during initialization of VM");
640 }
641 }
642
643 void vm_exit_during_initialization(Handle exception) {
644 tty->print_cr("Error occurred during initialization of VM");
645 // If there are exceptions on this thread it must be cleared
646 // first and here. Any future calls to EXCEPTION_MARK requires
647 // that no pending exceptions exist.
648 Thread *THREAD = Thread::current();
649 if (HAS_PENDING_EXCEPTION) {
650 CLEAR_PENDING_EXCEPTION;
651 }
652 java_lang_Throwable::print(exception, tty);
653 tty->cr();
654 java_lang_Throwable::print_stack_trace(exception(), tty);
655 tty->cr();
656 vm_notify_during_shutdown(NULL, NULL);
657
658 // Failure during initialization, we don't want to dump core
659 vm_abort(false);
660 }
661
662 void vm_exit_during_initialization(Symbol* ex, const char* message) {
663 ResourceMark rm;
664 vm_notify_during_shutdown(ex->as_C_string(), message);
665
666 // Failure during initialization, we don't want to dump core
667 vm_abort(false);
668 }
669
670 void vm_exit_during_initialization(const char* error, const char* message) {
671 vm_notify_during_shutdown(error, message);
672
673 // Failure during initialization, we don't want to dump core
674 vm_abort(false);
675 }
676
677 void vm_shutdown_during_initialization(const char* error, const char* message) {
678 vm_notify_during_shutdown(error, message);
679 vm_shutdown();
680 }
681
682 JDK_Version JDK_Version::_current;
683 const char* JDK_Version::_runtime_name;
684 const char* JDK_Version::_runtime_version;
685
686 void JDK_Version::initialize() {
687 jdk_version_info info;
688 assert(!_current.is_valid(), "Don't initialize twice");
689
690 void *lib_handle = os::native_java_library();
691 jdk_version_info_fn_t func = CAST_TO_FN_PTR(jdk_version_info_fn_t,
692 os::dll_lookup(lib_handle, "JDK_GetVersionInfo0"));
693
694 if (func == NULL) {
695 // JDK older than 1.6
696 _current._partially_initialized = true;
697 } else {
698 (*func)(&info, sizeof(info));
699
700 int major = JDK_VERSION_MAJOR(info.jdk_version);
701 int minor = JDK_VERSION_MINOR(info.jdk_version);
702 int micro = JDK_VERSION_MICRO(info.jdk_version);
703 int build = JDK_VERSION_BUILD(info.jdk_version);
704 if (major == 1 && minor > 4) {
705 // We represent "1.5.0" as "5.0", but 1.4.2 as itself.
706 major = minor;
707 minor = micro;
708 micro = 0;
709 }
710 _current = JDK_Version(major, minor, micro, info.update_version,
711 info.special_update_version, build,
712 info.thread_park_blocker == 1,
713 info.post_vm_init_hook_enabled == 1,
714 info.pending_list_uses_discovered_field == 1);
715 }
716 }
717
718 void JDK_Version::fully_initialize(
719 uint8_t major, uint8_t minor, uint8_t micro, uint8_t update) {
720 // This is only called when current is less than 1.6 and we've gotten
721 // far enough in the initialization to determine the exact version.
722 assert(major < 6, "not needed for JDK version >= 6");
723 assert(is_partially_initialized(), "must not initialize");
724 if (major < 5) {
725 // JDK verison sequence: 1.2.x, 1.3.x, 1.4.x, 5.0.x, 6.0.x, etc.
726 micro = minor;
727 minor = major;
728 major = 1;
729 }
730 _current = JDK_Version(major, minor, micro, update);
731 }
732
733 void JDK_Version_init() {
734 JDK_Version::initialize();
735 }
736
737 static int64_t encode_jdk_version(const JDK_Version& v) {
738 return
739 ((int64_t)v.major_version() << (BitsPerByte * 5)) |
740 ((int64_t)v.minor_version() << (BitsPerByte * 4)) |
741 ((int64_t)v.micro_version() << (BitsPerByte * 3)) |
742 ((int64_t)v.update_version() << (BitsPerByte * 2)) |
743 ((int64_t)v.special_update_version() << (BitsPerByte * 1)) |
744 ((int64_t)v.build_number() << (BitsPerByte * 0));
745 }
746
747 int JDK_Version::compare(const JDK_Version& other) const {
748 assert(is_valid() && other.is_valid(), "Invalid version (uninitialized?)");
749 if (!is_partially_initialized() && other.is_partially_initialized()) {
750 return -(other.compare(*this)); // flip the comparators
751 }
752 assert(!other.is_partially_initialized(), "Not initialized yet");
753 if (is_partially_initialized()) {
754 assert(other.major_version() >= 6,
755 "Invalid JDK version comparison during initialization");
756 return -1;
757 } else {
758 uint64_t e = encode_jdk_version(*this);
759 uint64_t o = encode_jdk_version(other);
760 return (e > o) ? 1 : ((e == o) ? 0 : -1);
761 }
762 }
763
764 void JDK_Version::to_string(char* buffer, size_t buflen) const {
765 size_t index = 0;
766 if (!is_valid()) {
767 jio_snprintf(buffer, buflen, "%s", "(uninitialized)");
768 } else if (is_partially_initialized()) {
769 jio_snprintf(buffer, buflen, "%s", "(uninitialized) pre-1.6.0");
770 } else {
771 index += jio_snprintf(
772 &buffer[index], buflen - index, "%d.%d", _major, _minor);
773 if (_micro > 0) {
774 index += jio_snprintf(&buffer[index], buflen - index, ".%d", _micro);
775 }
776 if (_update > 0) {
777 index += jio_snprintf(&buffer[index], buflen - index, "_%02d", _update);
778 }
779 if (_special > 0) {
780 index += jio_snprintf(&buffer[index], buflen - index, "%c", _special);
781 }
782 if (_build > 0) {
783 index += jio_snprintf(&buffer[index], buflen - index, "-b%02d", _build);
784 }
785 }
786 }