1 /*
2 * Copyright (c) 1997, 2011, 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/constantPoolOop.hpp"
37 #include "oops/generateOopMap.hpp"
38 #include "oops/instanceKlass.hpp"
39 #include "oops/instanceKlassKlass.hpp"
40 #include "oops/instanceOop.hpp"
41 #include "oops/methodOop.hpp"
42 #include "oops/objArrayOop.hpp"
43 #include "oops/oop.inline.hpp"
44 #include "oops/symbol.hpp"
45 #include "prims/jvmtiExport.hpp"
46 #include "runtime/aprofiler.hpp"
47 #include "runtime/arguments.hpp"
48 #include "runtime/biasedLocking.hpp"
49 #include "runtime/compilationPolicy.hpp"
50 #include "runtime/fprofiler.hpp"
51 #include "runtime/init.hpp"
52 #include "runtime/interfaceSupport.hpp"
53 #include "runtime/java.hpp"
54 #include "runtime/memprofiler.hpp"
55 #include "runtime/sharedRuntime.hpp"
56 #include "runtime/statSampler.hpp"
57 #include "runtime/task.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 "trace/traceEventTypes.hpp"
64 #include "utilities/dtrace.hpp"
65 #include "utilities/globalDefinitions.hpp"
66 #include "utilities/histogram.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 #ifdef TARGET_OS_FAMILY_linux
84 # include "thread_linux.inline.hpp"
85 #endif
86 #ifdef TARGET_OS_FAMILY_solaris
87 # include "thread_solaris.inline.hpp"
88 #endif
89 #ifdef TARGET_OS_FAMILY_windows
90 # include "thread_windows.inline.hpp"
91 #endif
92 #ifdef TARGET_OS_FAMILY_bsd
93 # include "thread_bsd.inline.hpp"
94 #endif
95 #ifndef SERIALGC
96 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp"
97 #include "gc_implementation/parallelScavenge/psScavenge.hpp"
98 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp"
99 #endif
100 #ifdef COMPILER1
101 #include "c1/c1_Compiler.hpp"
102 #include "c1/c1_Runtime1.hpp"
103 #endif
104 #ifdef COMPILER2
105 #include "code/compiledIC.hpp"
106 #include "compiler/methodLiveness.hpp"
107 #include "opto/compile.hpp"
108 #include "opto/indexSet.hpp"
109 #include "opto/runtime.hpp"
110 #endif
111
112 #ifndef USDT2
113 HS_DTRACE_PROBE_DECL(hotspot, vm__shutdown);
114 #endif /* !USDT2 */
115
116 #ifndef PRODUCT
117
118 // Statistics printing (method invocation histogram)
119
120 GrowableArray<methodOop>* collected_invoked_methods;
121
122 void collect_invoked_methods(methodOop m) {
123 if (m->invocation_count() + m->compiled_invocation_count() >= 1 ) {
124 collected_invoked_methods->push(m);
125 }
126 }
127
128
129 GrowableArray<methodOop>* collected_profiled_methods;
130
131 void collect_profiled_methods(methodOop m) {
132 methodHandle mh(Thread::current(), m);
133 if ((m->method_data() != NULL) &&
134 (PrintMethodData || CompilerOracle::should_print(mh))) {
135 collected_profiled_methods->push(m);
136 }
137 }
138
139
140 int compare_methods(methodOop* a, methodOop* b) {
141 // %%% there can be 32-bit overflow here
142 return ((*b)->invocation_count() + (*b)->compiled_invocation_count())
143 - ((*a)->invocation_count() + (*a)->compiled_invocation_count());
144 }
145
146
147 void print_method_invocation_histogram() {
148 ResourceMark rm;
149 HandleMark hm;
150 collected_invoked_methods = new GrowableArray<methodOop>(1024);
151 SystemDictionary::methods_do(collect_invoked_methods);
152 collected_invoked_methods->sort(&compare_methods);
153 //
154 tty->cr();
155 tty->print_cr("Histogram Over MethodOop Invocation Counters (cutoff = %d):", MethodHistogramCutoff);
156 tty->cr();
157 tty->print_cr("____Count_(I+C)____Method________________________Module_________________");
158 unsigned total = 0, int_total = 0, comp_total = 0, static_total = 0, final_total = 0,
159 synch_total = 0, nativ_total = 0, acces_total = 0;
160 for (int index = 0; index < collected_invoked_methods->length(); index++) {
161 methodOop m = collected_invoked_methods->at(index);
162 int c = m->invocation_count() + m->compiled_invocation_count();
163 if (c >= MethodHistogramCutoff) m->print_invocation_count();
164 int_total += m->invocation_count();
165 comp_total += m->compiled_invocation_count();
166 if (m->is_final()) final_total += c;
167 if (m->is_static()) static_total += c;
168 if (m->is_synchronized()) synch_total += c;
169 if (m->is_native()) nativ_total += c;
170 if (m->is_accessor()) acces_total += c;
171 }
172 tty->cr();
173 total = int_total + comp_total;
174 tty->print_cr("Invocations summary:");
175 tty->print_cr("\t%9d (%4.1f%%) interpreted", int_total, 100.0 * int_total / total);
176 tty->print_cr("\t%9d (%4.1f%%) compiled", comp_total, 100.0 * comp_total / total);
177 tty->print_cr("\t%9d (100%%) total", total);
178 tty->print_cr("\t%9d (%4.1f%%) synchronized", synch_total, 100.0 * synch_total / total);
179 tty->print_cr("\t%9d (%4.1f%%) final", final_total, 100.0 * final_total / total);
180 tty->print_cr("\t%9d (%4.1f%%) static", static_total, 100.0 * static_total / total);
181 tty->print_cr("\t%9d (%4.1f%%) native", nativ_total, 100.0 * nativ_total / total);
182 tty->print_cr("\t%9d (%4.1f%%) accessor", acces_total, 100.0 * acces_total / total);
183 tty->cr();
184 SharedRuntime::print_call_statistics(comp_total);
185 }
186
187 void print_method_profiling_data() {
188 ResourceMark rm;
189 HandleMark hm;
190 collected_profiled_methods = new GrowableArray<methodOop>(1024);
191 SystemDictionary::methods_do(collect_profiled_methods);
192 collected_profiled_methods->sort(&compare_methods);
193
194 int count = collected_profiled_methods->length();
195 if (count > 0) {
196 for (int index = 0; index < count; index++) {
197 methodOop m = collected_profiled_methods->at(index);
198 ttyLocker ttyl;
199 tty->print_cr("------------------------------------------------------------------------");
200 //m->print_name(tty);
201 m->print_invocation_count();
202 tty->cr();
203 m->print_codes();
204 }
205 tty->print_cr("------------------------------------------------------------------------");
206 }
207 }
208
209 void print_bytecode_count() {
210 if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
211 tty->print_cr("[BytecodeCounter::counter_value = %d]", BytecodeCounter::counter_value());
212 }
213 }
214
215 AllocStats alloc_stats;
216
217
218
219 // General statistics printing (profiling ...)
220
221 void print_statistics() {
222
223 #ifdef ASSERT
224
225 if (CountRuntimeCalls) {
226 extern Histogram *RuntimeHistogram;
227 RuntimeHistogram->print();
228 }
229
230 if (CountJNICalls) {
231 extern Histogram *JNIHistogram;
232 JNIHistogram->print();
233 }
234
235 if (CountJVMCalls) {
236 extern Histogram *JVMHistogram;
237 JVMHistogram->print();
238 }
239
240 #endif
241
242 if (MemProfiling) {
243 MemProfiler::disengage();
244 }
245
246 if (CITime) {
247 CompileBroker::print_times();
248 }
249
250 #ifdef COMPILER1
251 if ((PrintC1Statistics || LogVMOutput || LogCompilation) && UseCompiler) {
252 FlagSetting fs(DisplayVMOutput, DisplayVMOutput && PrintC1Statistics);
253 Runtime1::print_statistics();
254 Deoptimization::print_statistics();
255 SharedRuntime::print_statistics();
256 nmethod::print_statistics();
257 }
258 #endif /* COMPILER1 */
259
260 #ifdef COMPILER2
261 if ((PrintOptoStatistics || LogVMOutput || LogCompilation) && UseCompiler) {
262 FlagSetting fs(DisplayVMOutput, DisplayVMOutput && PrintOptoStatistics);
263 Compile::print_statistics();
264 #ifndef COMPILER1
265 Deoptimization::print_statistics();
266 nmethod::print_statistics();
267 SharedRuntime::print_statistics();
268 #endif //COMPILER1
269 os::print_statistics();
270 }
271
272 if (PrintLockStatistics || PrintPreciseBiasedLockingStatistics) {
273 OptoRuntime::print_named_counters();
274 }
275
276 if (TimeLivenessAnalysis) {
277 MethodLiveness::print_times();
278 }
279 #ifdef ASSERT
280 if (CollectIndexSetStatistics) {
281 IndexSet::print_statistics();
282 }
283 #endif // ASSERT
284 #endif // COMPILER2
285 if (CountCompiledCalls) {
286 print_method_invocation_histogram();
287 }
288 if (ProfileInterpreter COMPILER1_PRESENT(|| C1UpdateMethodData)) {
289 print_method_profiling_data();
290 }
291 if (TimeCompiler) {
292 COMPILER2_PRESENT(Compile::print_timers();)
293 }
294 if (TimeCompilationPolicy) {
295 CompilationPolicy::policy()->print_time();
296 }
297 if (TimeOopMap) {
298 GenerateOopMap::print_time();
299 }
300 if (ProfilerCheckIntervals) {
301 PeriodicTask::print_intervals();
302 }
303 if (PrintSymbolTableSizeHistogram) {
304 SymbolTable::print_histogram();
305 }
306 if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
307 BytecodeCounter::print();
308 }
309 if (PrintBytecodePairHistogram) {
310 BytecodePairHistogram::print();
311 }
312
313 if (PrintCodeCache) {
314 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
315 CodeCache::print();
316 }
317
318 if (PrintCodeCache2) {
319 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
320 CodeCache::print_internals();
321 }
322
323 if (PrintClassStatistics) {
324 SystemDictionary::print_class_statistics();
325 }
326 if (PrintMethodStatistics) {
327 SystemDictionary::print_method_statistics();
328 }
329
330 if (PrintVtableStats) {
331 klassVtable::print_statistics();
332 klassItable::print_statistics();
333 }
334 if (VerifyOops) {
335 tty->print_cr("+VerifyOops count: %d", StubRoutines::verify_oop_count());
336 }
337
338 print_bytecode_count();
339 if (PrintMallocStatistics) {
340 tty->print("allocation stats: ");
341 alloc_stats.print();
342 tty->cr();
343 }
344
345 if (PrintSystemDictionaryAtExit) {
346 SystemDictionary::print();
347 }
348
349 if (PrintBiasedLockingStatistics) {
350 BiasedLocking::print_counters();
351 }
352
353 #ifdef ENABLE_ZAP_DEAD_LOCALS
354 #ifdef COMPILER2
355 if (ZapDeadCompiledLocals) {
356 tty->print_cr("Compile::CompiledZap_count = %d", Compile::CompiledZap_count);
357 tty->print_cr("OptoRuntime::ZapDeadCompiledLocals_count = %d", OptoRuntime::ZapDeadCompiledLocals_count);
358 }
359 #endif // COMPILER2
360 #endif // ENABLE_ZAP_DEAD_LOCALS
361
362 // Native memory tracking data
363 if (PrintNMTStatistics) {
364 if (MemTracker::is_on()) {
365 BaselineTTYOutputer outputer(tty);
366 MemTracker::print_memory_usage(outputer, K, false);
367 } else {
368 tty->print("Native memory tracking is off due to ");
369 tty->print_cr(MemTracker::reason());
370 }
371 }
372 }
373
374 #else // PRODUCT MODE STATISTICS
375
376 void print_statistics() {
377
378 if (CITime) {
379 CompileBroker::print_times();
380 }
381 #ifdef COMPILER2
382 if (PrintPreciseBiasedLockingStatistics) {
383 OptoRuntime::print_named_counters();
384 }
385 #endif
386 if (PrintBiasedLockingStatistics) {
387 BiasedLocking::print_counters();
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 // Note: before_exit() can be executed only once, if more than one threads
434 // are trying to shutdown the VM at the same time, only one thread
435 // can run before_exit() and all other threads must wait.
436 void before_exit(JavaThread * thread) {
437 #define BEFORE_EXIT_NOT_RUN 0
438 #define BEFORE_EXIT_RUNNING 1
439 #define BEFORE_EXIT_DONE 2
440 static jint volatile _before_exit_status = BEFORE_EXIT_NOT_RUN;
441
442 // Note: don't use a Mutex to guard the entire before_exit(), as
443 // JVMTI post_thread_end_event and post_vm_death_event will run native code.
444 // A CAS or OSMutex would work just fine but then we need to manipulate
445 // thread state for Safepoint. Here we use Monitor wait() and notify_all()
446 // for synchronization.
447 { MutexLocker ml(BeforeExit_lock);
448 switch (_before_exit_status) {
449 case BEFORE_EXIT_NOT_RUN:
450 _before_exit_status = BEFORE_EXIT_RUNNING;
451 break;
452 case BEFORE_EXIT_RUNNING:
453 while (_before_exit_status == BEFORE_EXIT_RUNNING) {
454 BeforeExit_lock->wait();
455 }
456 assert(_before_exit_status == BEFORE_EXIT_DONE, "invalid state");
457 return;
458 case BEFORE_EXIT_DONE:
459 return;
460 }
461 }
462
463 // The only difference between this and Win32's _onexit procs is that
464 // this version is invoked before any threads get killed.
465 ExitProc* current = exit_procs;
466 while (current != NULL) {
467 ExitProc* next = current->next();
468 current->evaluate();
469 delete current;
470 current = next;
471 }
472
473 // Hang forever on exit if we're reporting an error.
474 if (ShowMessageBoxOnError && is_error_reported()) {
475 os::infinite_sleep();
476 }
477
478 // Terminate watcher thread - must before disenrolling any periodic task
479 if (PeriodicTask::num_tasks() > 0)
480 WatcherThread::stop();
481
482 // Print statistics gathered (profiling ...)
483 if (Arguments::has_profile()) {
484 FlatProfiler::disengage();
485 FlatProfiler::print(10);
486 }
487
488 // shut down the StatSampler task
489 StatSampler::disengage();
490 StatSampler::destroy();
491
492 // We do not need to explicitly stop concurrent GC threads because the
493 // JVM will be taken down at a safepoint when such threads are inactive --
494 // except for some concurrent G1 threads, see (comment in)
495 // Threads::destroy_vm().
496
497 // Print GC/heap related information.
498 if (PrintGCDetails) {
499 Universe::print();
500 AdaptiveSizePolicyOutput(0);
501 }
502
503
504 if (Arguments::has_alloc_profile()) {
505 HandleMark hm;
506 // Do one last collection to enumerate all the objects
507 // allocated since the last one.
508 Universe::heap()->collect(GCCause::_allocation_profiler);
509 AllocationProfiler::disengage();
510 AllocationProfiler::print(0);
511 }
512
513 if (PrintBytecodeHistogram) {
514 BytecodeHistogram::print();
515 }
516
517 if (JvmtiExport::should_post_thread_life()) {
518 JvmtiExport::post_thread_end(thread);
519 }
520
521 EVENT_BEGIN(TraceEventThreadEnd, event);
522 EVENT_COMMIT(event,
523 EVENT_SET(event, javalangthread, java_lang_Thread::thread_id(thread->threadObj())));
524
525 // Always call even when there are not JVMTI environments yet, since environments
526 // may be attached late and JVMTI must track phases of VM execution
527 JvmtiExport::post_vm_death();
528 Threads::shutdown_vm_agents();
529
530 // Terminate the signal thread
531 // Note: we don't wait until it actually dies.
532 os::terminate_signal_thread();
533
534 print_statistics();
535 Universe::heap()->print_tracing_info();
536
537 { MutexLocker ml(BeforeExit_lock);
538 _before_exit_status = BEFORE_EXIT_DONE;
539 BeforeExit_lock->notify_all();
540 }
541
542 #undef BEFORE_EXIT_NOT_RUN
543 #undef BEFORE_EXIT_RUNNING
544 #undef BEFORE_EXIT_DONE
545 }
546
547 void vm_exit(int code) {
548 Thread* thread = ThreadLocalStorage::is_initialized() ?
549 ThreadLocalStorage::get_thread_slow() : NULL;
550 if (thread == NULL) {
551 // we have serious problems -- just exit
552 vm_direct_exit(code);
553 }
554
555 if (VMThread::vm_thread() != NULL) {
556 // Fire off a VM_Exit operation to bring VM to a safepoint and exit
557 VM_Exit op(code);
558 if (thread->is_Java_thread())
559 ((JavaThread*)thread)->set_thread_state(_thread_in_vm);
560 VMThread::execute(&op);
561 // should never reach here; but in case something wrong with VM Thread.
562 vm_direct_exit(code);
563 } else {
564 // VM thread is gone, just exit
565 vm_direct_exit(code);
566 }
567 ShouldNotReachHere();
568 }
569
570 void notify_vm_shutdown() {
571 // For now, just a dtrace probe.
572 #ifndef USDT2
573 HS_DTRACE_PROBE(hotspot, vm__shutdown);
574 HS_DTRACE_WORKAROUND_TAIL_CALL_BUG();
575 #else /* USDT2 */
576 HOTSPOT_VM_SHUTDOWN();
577 #endif /* USDT2 */
578 }
579
580 void vm_direct_exit(int code) {
581 notify_vm_shutdown();
582 os::wait_for_keypress_at_exit();
583 ::exit(code);
584 }
585
586 void vm_perform_shutdown_actions() {
587 // Warning: do not call 'exit_globals()' here. All threads are still running.
588 // Calling 'exit_globals()' will disable thread-local-storage and cause all
589 // kinds of assertions to trigger in debug mode.
590 if (is_init_completed()) {
591 Thread* thread = ThreadLocalStorage::is_initialized() ?
592 ThreadLocalStorage::get_thread_slow() : NULL;
593 if (thread != NULL && thread->is_Java_thread()) {
594 // We are leaving the VM, set state to native (in case any OS exit
595 // handlers call back to the VM)
596 JavaThread* jt = (JavaThread*)thread;
597 // Must always be walkable or have no last_Java_frame when in
598 // thread_in_native
599 jt->frame_anchor()->make_walkable(jt);
600 jt->set_thread_state(_thread_in_native);
601 }
602 }
603 notify_vm_shutdown();
604 }
605
606 void vm_shutdown()
607 {
608 vm_perform_shutdown_actions();
609 os::wait_for_keypress_at_exit();
610 os::shutdown();
611 }
612
613 void vm_abort(bool dump_core) {
614 vm_perform_shutdown_actions();
615 os::wait_for_keypress_at_exit();
616 os::abort(dump_core);
617 ShouldNotReachHere();
618 }
619
620 void vm_notify_during_shutdown(const char* error, const char* message) {
621 if (error != NULL) {
622 tty->print_cr("Error occurred during initialization of VM");
623 tty->print("%s", error);
624 if (message != NULL) {
625 tty->print_cr(": %s", message);
626 }
627 else {
628 tty->cr();
629 }
630 }
631 if (ShowMessageBoxOnError && WizardMode) {
632 fatal("Error occurred during initialization of VM");
633 }
634 }
635
636 void vm_exit_during_initialization(Handle exception) {
637 tty->print_cr("Error occurred during initialization of VM");
638 // If there are exceptions on this thread it must be cleared
639 // first and here. Any future calls to EXCEPTION_MARK requires
640 // that no pending exceptions exist.
641 Thread *THREAD = Thread::current();
642 if (HAS_PENDING_EXCEPTION) {
643 CLEAR_PENDING_EXCEPTION;
644 }
645 java_lang_Throwable::print(exception, tty);
646 tty->cr();
647 java_lang_Throwable::print_stack_trace(exception(), tty);
648 tty->cr();
649 vm_notify_during_shutdown(NULL, NULL);
650
651 // Failure during initialization, we don't want to dump core
652 vm_abort(false);
653 }
654
655 void vm_exit_during_initialization(Symbol* ex, const char* message) {
656 ResourceMark rm;
657 vm_notify_during_shutdown(ex->as_C_string(), message);
658
659 // Failure during initialization, we don't want to dump core
660 vm_abort(false);
661 }
662
663 void vm_exit_during_initialization(const char* error, const char* message) {
664 vm_notify_during_shutdown(error, message);
665
666 // Failure during initialization, we don't want to dump core
667 vm_abort(false);
668 }
669
670 void vm_shutdown_during_initialization(const char* error, const char* message) {
671 vm_notify_during_shutdown(error, message);
672 vm_shutdown();
673 }
674
675 JDK_Version JDK_Version::_current;
676 const char* JDK_Version::_runtime_name;
677
678 void JDK_Version::initialize() {
679 jdk_version_info info;
680 assert(!_current.is_valid(), "Don't initialize twice");
681
682 void *lib_handle = os::native_java_library();
683 jdk_version_info_fn_t func = CAST_TO_FN_PTR(jdk_version_info_fn_t,
684 os::dll_lookup(lib_handle, "JDK_GetVersionInfo0"));
685
686 if (func == NULL) {
687 // JDK older than 1.6
688 _current._partially_initialized = true;
689 } else {
690 (*func)(&info, sizeof(info));
691
692 int major = JDK_VERSION_MAJOR(info.jdk_version);
693 int minor = JDK_VERSION_MINOR(info.jdk_version);
694 int micro = JDK_VERSION_MICRO(info.jdk_version);
695 int build = JDK_VERSION_BUILD(info.jdk_version);
696 if (major == 1 && minor > 4) {
697 // We represent "1.5.0" as "5.0", but 1.4.2 as itself.
698 major = minor;
699 minor = micro;
700 micro = 0;
701 }
702 _current = JDK_Version(major, minor, micro, info.update_version,
703 info.special_update_version, build,
704 info.thread_park_blocker == 1,
705 info.post_vm_init_hook_enabled == 1,
706 info.pending_list_uses_discovered_field == 1);
707 }
708 }
709
710 void JDK_Version::fully_initialize(
711 uint8_t major, uint8_t minor, uint8_t micro, uint8_t update) {
712 // This is only called when current is less than 1.6 and we've gotten
713 // far enough in the initialization to determine the exact version.
714 assert(major < 6, "not needed for JDK version >= 6");
715 assert(is_partially_initialized(), "must not initialize");
716 if (major < 5) {
717 // JDK verison sequence: 1.2.x, 1.3.x, 1.4.x, 5.0.x, 6.0.x, etc.
718 micro = minor;
719 minor = major;
720 major = 1;
721 }
722 _current = JDK_Version(major, minor, micro, update);
723 }
724
725 void JDK_Version_init() {
726 JDK_Version::initialize();
727 }
728
729 static int64_t encode_jdk_version(const JDK_Version& v) {
730 return
731 ((int64_t)v.major_version() << (BitsPerByte * 5)) |
732 ((int64_t)v.minor_version() << (BitsPerByte * 4)) |
733 ((int64_t)v.micro_version() << (BitsPerByte * 3)) |
734 ((int64_t)v.update_version() << (BitsPerByte * 2)) |
735 ((int64_t)v.special_update_version() << (BitsPerByte * 1)) |
736 ((int64_t)v.build_number() << (BitsPerByte * 0));
737 }
738
739 int JDK_Version::compare(const JDK_Version& other) const {
740 assert(is_valid() && other.is_valid(), "Invalid version (uninitialized?)");
741 if (!is_partially_initialized() && other.is_partially_initialized()) {
742 return -(other.compare(*this)); // flip the comparators
743 }
744 assert(!other.is_partially_initialized(), "Not initialized yet");
745 if (is_partially_initialized()) {
746 assert(other.major_version() >= 6,
747 "Invalid JDK version comparison during initialization");
748 return -1;
749 } else {
750 uint64_t e = encode_jdk_version(*this);
751 uint64_t o = encode_jdk_version(other);
752 return (e > o) ? 1 : ((e == o) ? 0 : -1);
753 }
754 }
755
756 void JDK_Version::to_string(char* buffer, size_t buflen) const {
757 size_t index = 0;
758 if (!is_valid()) {
759 jio_snprintf(buffer, buflen, "%s", "(uninitialized)");
760 } else if (is_partially_initialized()) {
761 jio_snprintf(buffer, buflen, "%s", "(uninitialized) pre-1.6.0");
762 } else {
763 index += jio_snprintf(
764 &buffer[index], buflen - index, "%d.%d", _major, _minor);
765 if (_micro > 0) {
766 index += jio_snprintf(&buffer[index], buflen - index, ".%d", _micro);
767 }
768 if (_update > 0) {
769 index += jio_snprintf(&buffer[index], buflen - index, "_%02d", _update);
770 }
771 if (_special > 0) {
772 index += jio_snprintf(&buffer[index], buflen - index, "%c", _special);
773 }
774 if (_build > 0) {
775 index += jio_snprintf(&buffer[index], buflen - index, "-b%02d", _build);
776 }
777 }
778 }