Mercurial > jdk8-mips64-public > hotspot / file revision
src/share/vm/runtime/java.cpp@a7509aff1b06
src/share/vm/runtime/java.cpp
Mon, 17 Sep 2012 07:36:31 -0400
- author
- dholmes
- date
- Mon, 17 Sep 2012 07:36:31 -0400
- changeset 4077
- a7509aff1b06
- parent 4037
- da91efe96a93
- child 4081
- 9a86ddfc6c8f
- permissions
- -rw-r--r--
7194254: jstack reports wrong thread priorities
Reviewed-by: dholmes, sla, fparain
Contributed-by: Dmytro Sheyko <dmytro_sheyko@hotmail.com>
1 /*
2 * Copyright (c) 1997, 2012, 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 */
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/timer.hpp"
58 #include "runtime/vm_operations.hpp"
59 #include "trace/tracing.hpp"
60 #include "trace/traceEventTypes.hpp"
61 #include "utilities/dtrace.hpp"
62 #include "utilities/globalDefinitions.hpp"
63 #include "utilities/histogram.hpp"
64 #include "utilities/vmError.hpp"
65 #ifdef TARGET_ARCH_x86
66 # include "vm_version_x86.hpp"
67 #endif
68 #ifdef TARGET_ARCH_sparc
69 # include "vm_version_sparc.hpp"
70 #endif
71 #ifdef TARGET_ARCH_zero
72 # include "vm_version_zero.hpp"
73 #endif
74 #ifdef TARGET_ARCH_arm
75 # include "vm_version_arm.hpp"
76 #endif
77 #ifdef TARGET_ARCH_ppc
78 # include "vm_version_ppc.hpp"
79 #endif
80 #ifdef TARGET_OS_FAMILY_linux
81 # include "thread_linux.inline.hpp"
82 #endif
83 #ifdef TARGET_OS_FAMILY_solaris
84 # include "thread_solaris.inline.hpp"
85 #endif
86 #ifdef TARGET_OS_FAMILY_windows
87 # include "thread_windows.inline.hpp"
88 #endif
89 #ifdef TARGET_OS_FAMILY_bsd
90 # include "thread_bsd.inline.hpp"
91 #endif
92 #ifndef SERIALGC
93 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp"
94 #include "gc_implementation/parallelScavenge/psScavenge.hpp"
95 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp"
96 #endif
97 #ifdef COMPILER1
98 #include "c1/c1_Compiler.hpp"
99 #include "c1/c1_Runtime1.hpp"
100 #endif
101 #ifdef COMPILER2
102 #include "code/compiledIC.hpp"
103 #include "compiler/methodLiveness.hpp"
104 #include "opto/compile.hpp"
105 #include "opto/indexSet.hpp"
106 #include "opto/runtime.hpp"
107 #endif
109 #ifndef USDT2
110 HS_DTRACE_PROBE_DECL(hotspot, vm__shutdown);
111 #endif /* !USDT2 */
113 #ifndef PRODUCT
115 // Statistics printing (method invocation histogram)
117 GrowableArray<Method*>* collected_invoked_methods;
119 void collect_invoked_methods(Method* m) {
120 if (m->invocation_count() + m->compiled_invocation_count() >= 1 ) {
121 collected_invoked_methods->push(m);
122 }
123 }
126 GrowableArray<Method*>* collected_profiled_methods;
128 void collect_profiled_methods(Method* m) {
129 Thread* thread = Thread::current();
130 // This HandleMark prevents a huge amount of handles from being added
131 // to the metadata_handles() array on the thread.
132 HandleMark hm(thread);
133 methodHandle mh(thread, m);
134 if ((m->method_data() != NULL) &&
135 (PrintMethodData || CompilerOracle::should_print(mh))) {
136 collected_profiled_methods->push(m);
137 }
138 }
141 int compare_methods(Method** a, Method** b) {
142 // %%% there can be 32-bit overflow here
143 return ((*b)->invocation_count() + (*b)->compiled_invocation_count())
144 - ((*a)->invocation_count() + (*a)->compiled_invocation_count());
145 }
148 void print_method_invocation_histogram() {
149 ResourceMark rm;
150 HandleMark hm;
151 collected_invoked_methods = new GrowableArray<Method*>(1024);
152 SystemDictionary::methods_do(collect_invoked_methods);
153 collected_invoked_methods->sort(&compare_methods);
154 //
155 tty->cr();
156 tty->print_cr("Histogram Over MethodOop Invocation Counters (cutoff = %d):", MethodHistogramCutoff);
157 tty->cr();
158 tty->print_cr("____Count_(I+C)____Method________________________Module_________________");
159 unsigned total = 0, int_total = 0, comp_total = 0, static_total = 0, final_total = 0,
160 synch_total = 0, nativ_total = 0, acces_total = 0;
161 for (int index = 0; index < collected_invoked_methods->length(); index++) {
162 Method* m = collected_invoked_methods->at(index);
163 int c = m->invocation_count() + m->compiled_invocation_count();
164 if (c >= MethodHistogramCutoff) m->print_invocation_count();
165 int_total += m->invocation_count();
166 comp_total += m->compiled_invocation_count();
167 if (m->is_final()) final_total += c;
168 if (m->is_static()) static_total += c;
169 if (m->is_synchronized()) synch_total += c;
170 if (m->is_native()) nativ_total += c;
171 if (m->is_accessor()) acces_total += c;
172 }
173 tty->cr();
174 total = int_total + comp_total;
175 tty->print_cr("Invocations summary:");
176 tty->print_cr("\t%9d (%4.1f%%) interpreted", int_total, 100.0 * int_total / total);
177 tty->print_cr("\t%9d (%4.1f%%) compiled", comp_total, 100.0 * comp_total / total);
178 tty->print_cr("\t%9d (100%%) total", total);
179 tty->print_cr("\t%9d (%4.1f%%) synchronized", synch_total, 100.0 * synch_total / total);
180 tty->print_cr("\t%9d (%4.1f%%) final", final_total, 100.0 * final_total / total);
181 tty->print_cr("\t%9d (%4.1f%%) static", static_total, 100.0 * static_total / total);
182 tty->print_cr("\t%9d (%4.1f%%) native", nativ_total, 100.0 * nativ_total / total);
183 tty->print_cr("\t%9d (%4.1f%%) accessor", acces_total, 100.0 * acces_total / total);
184 tty->cr();
185 SharedRuntime::print_call_statistics(comp_total);
186 }
188 void print_method_profiling_data() {
189 ResourceMark rm;
190 HandleMark hm;
191 collected_profiled_methods = new GrowableArray<Method*>(1024);
192 SystemDictionary::methods_do(collect_profiled_methods);
193 collected_profiled_methods->sort(&compare_methods);
195 int count = collected_profiled_methods->length();
196 if (count > 0) {
197 for (int index = 0; index < count; index++) {
198 Method* m = collected_profiled_methods->at(index);
199 ttyLocker ttyl;
200 tty->print_cr("------------------------------------------------------------------------");
201 //m->print_name(tty);
202 m->print_invocation_count();
203 tty->cr();
204 m->print_codes();
205 }
206 tty->print_cr("------------------------------------------------------------------------");
207 }
208 }
210 void print_bytecode_count() {
211 if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
212 tty->print_cr("[BytecodeCounter::counter_value = %d]", BytecodeCounter::counter_value());
213 }
214 }
216 AllocStats alloc_stats;
220 // General statistics printing (profiling ...)
222 void print_statistics() {
224 #ifdef ASSERT
226 if (CountRuntimeCalls) {
227 extern Histogram *RuntimeHistogram;
228 RuntimeHistogram->print();
229 }
231 if (CountJNICalls) {
232 extern Histogram *JNIHistogram;
233 JNIHistogram->print();
234 }
236 if (CountJVMCalls) {
237 extern Histogram *JVMHistogram;
238 JVMHistogram->print();
239 }
241 #endif
243 if (MemProfiling) {
244 MemProfiler::disengage();
245 }
247 if (CITime) {
248 CompileBroker::print_times();
249 }
251 #ifdef COMPILER1
252 if ((PrintC1Statistics || LogVMOutput || LogCompilation) && UseCompiler) {
253 FlagSetting fs(DisplayVMOutput, DisplayVMOutput && PrintC1Statistics);
254 Runtime1::print_statistics();
255 Deoptimization::print_statistics();
256 SharedRuntime::print_statistics();
257 nmethod::print_statistics();
258 }
259 #endif /* COMPILER1 */
261 #ifdef COMPILER2
262 if ((PrintOptoStatistics || LogVMOutput || LogCompilation) && UseCompiler) {
263 FlagSetting fs(DisplayVMOutput, DisplayVMOutput && PrintOptoStatistics);
264 Compile::print_statistics();
265 #ifndef COMPILER1
266 Deoptimization::print_statistics();
267 nmethod::print_statistics();
268 SharedRuntime::print_statistics();
269 #endif //COMPILER1
270 os::print_statistics();
271 }
273 if (PrintLockStatistics || PrintPreciseBiasedLockingStatistics) {
274 OptoRuntime::print_named_counters();
275 }
277 if (TimeLivenessAnalysis) {
278 MethodLiveness::print_times();
279 }
280 #ifdef ASSERT
281 if (CollectIndexSetStatistics) {
282 IndexSet::print_statistics();
283 }
284 #endif // ASSERT
285 #endif // COMPILER2
286 if (CountCompiledCalls) {
287 print_method_invocation_histogram();
288 }
289 if (ProfileInterpreter COMPILER1_PRESENT(|| C1UpdateMethodData)) {
290 print_method_profiling_data();
291 }
292 if (TimeCompiler) {
293 COMPILER2_PRESENT(Compile::print_timers();)
294 }
295 if (TimeCompilationPolicy) {
296 CompilationPolicy::policy()->print_time();
297 }
298 if (TimeOopMap) {
299 GenerateOopMap::print_time();
300 }
301 if (ProfilerCheckIntervals) {
302 PeriodicTask::print_intervals();
303 }
304 if (PrintSymbolTableSizeHistogram) {
305 SymbolTable::print_histogram();
306 }
307 if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
308 BytecodeCounter::print();
309 }
310 if (PrintBytecodePairHistogram) {
311 BytecodePairHistogram::print();
312 }
314 if (PrintCodeCache) {
315 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
316 CodeCache::print();
317 }
319 if (PrintCodeCache2) {
320 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
321 CodeCache::print_internals();
322 }
324 if (PrintClassStatistics) {
325 SystemDictionary::print_class_statistics();
326 }
327 if (PrintMethodStatistics) {
328 SystemDictionary::print_method_statistics();
329 }
331 if (PrintVtableStats) {
332 klassVtable::print_statistics();
333 klassItable::print_statistics();
334 }
335 if (VerifyOops) {
336 tty->print_cr("+VerifyOops count: %d", StubRoutines::verify_oop_count());
337 }
339 print_bytecode_count();
340 if (PrintMallocStatistics) {
341 tty->print("allocation stats: ");
342 alloc_stats.print();
343 tty->cr();
344 }
346 if (PrintSystemDictionaryAtExit) {
347 SystemDictionary::print();
348 }
350 if (PrintBiasedLockingStatistics) {
351 BiasedLocking::print_counters();
352 }
354 #ifdef ENABLE_ZAP_DEAD_LOCALS
355 #ifdef COMPILER2
356 if (ZapDeadCompiledLocals) {
357 tty->print_cr("Compile::CompiledZap_count = %d", Compile::CompiledZap_count);
358 tty->print_cr("OptoRuntime::ZapDeadCompiledLocals_count = %d", OptoRuntime::ZapDeadCompiledLocals_count);
359 }
360 #endif // COMPILER2
361 #endif // ENABLE_ZAP_DEAD_LOCALS
362 }
364 #else // PRODUCT MODE STATISTICS
366 void print_statistics() {
368 if (CITime) {
369 CompileBroker::print_times();
370 }
371 #ifdef COMPILER2
372 if (PrintPreciseBiasedLockingStatistics) {
373 OptoRuntime::print_named_counters();
374 }
375 #endif
376 if (PrintBiasedLockingStatistics) {
377 BiasedLocking::print_counters();
378 }
379 }
381 #endif
384 // Helper class for registering on_exit calls through JVM_OnExit
386 extern "C" {
387 typedef void (*__exit_proc)(void);
388 }
390 class ExitProc : public CHeapObj<mtInternal> {
391 private:
392 __exit_proc _proc;
393 // void (*_proc)(void);
394 ExitProc* _next;
395 public:
396 // ExitProc(void (*proc)(void)) {
397 ExitProc(__exit_proc proc) {
398 _proc = proc;
399 _next = NULL;
400 }
401 void evaluate() { _proc(); }
402 ExitProc* next() const { return _next; }
403 void set_next(ExitProc* next) { _next = next; }
404 };
407 // Linked list of registered on_exit procedures
409 static ExitProc* exit_procs = NULL;
412 extern "C" {
413 void register_on_exit_function(void (*func)(void)) {
414 ExitProc *entry = new ExitProc(func);
415 // Classic vm does not throw an exception in case the allocation failed,
416 if (entry != NULL) {
417 entry->set_next(exit_procs);
418 exit_procs = entry;
419 }
420 }
421 }
423 // Note: before_exit() can be executed only once, if more than one threads
424 // are trying to shutdown the VM at the same time, only one thread
425 // can run before_exit() and all other threads must wait.
426 void before_exit(JavaThread * thread) {
427 #define BEFORE_EXIT_NOT_RUN 0
428 #define BEFORE_EXIT_RUNNING 1
429 #define BEFORE_EXIT_DONE 2
430 static jint volatile _before_exit_status = BEFORE_EXIT_NOT_RUN;
432 // Note: don't use a Mutex to guard the entire before_exit(), as
433 // JVMTI post_thread_end_event and post_vm_death_event will run native code.
434 // A CAS or OSMutex would work just fine but then we need to manipulate
435 // thread state for Safepoint. Here we use Monitor wait() and notify_all()
436 // for synchronization.
437 { MutexLocker ml(BeforeExit_lock);
438 switch (_before_exit_status) {
439 case BEFORE_EXIT_NOT_RUN:
440 _before_exit_status = BEFORE_EXIT_RUNNING;
441 break;
442 case BEFORE_EXIT_RUNNING:
443 while (_before_exit_status == BEFORE_EXIT_RUNNING) {
444 BeforeExit_lock->wait();
445 }
446 assert(_before_exit_status == BEFORE_EXIT_DONE, "invalid state");
447 return;
448 case BEFORE_EXIT_DONE:
449 return;
450 }
451 }
453 // The only difference between this and Win32's _onexit procs is that
454 // this version is invoked before any threads get killed.
455 ExitProc* current = exit_procs;
456 while (current != NULL) {
457 ExitProc* next = current->next();
458 current->evaluate();
459 delete current;
460 current = next;
461 }
463 // Hang forever on exit if we're reporting an error.
464 if (ShowMessageBoxOnError && is_error_reported()) {
465 os::infinite_sleep();
466 }
468 // Terminate watcher thread - must before disenrolling any periodic task
469 if (PeriodicTask::num_tasks() > 0)
470 WatcherThread::stop();
472 // Print statistics gathered (profiling ...)
473 if (Arguments::has_profile()) {
474 FlatProfiler::disengage();
475 FlatProfiler::print(10);
476 }
478 // shut down the StatSampler task
479 StatSampler::disengage();
480 StatSampler::destroy();
482 // We do not need to explicitly stop concurrent GC threads because the
483 // JVM will be taken down at a safepoint when such threads are inactive --
484 // except for some concurrent G1 threads, see (comment in)
485 // Threads::destroy_vm().
487 // Print GC/heap related information.
488 if (PrintGCDetails) {
489 Universe::print();
490 AdaptiveSizePolicyOutput(0);
491 if (Verbose) {
492 ClassLoaderDataGraph::dump_on(gclog_or_tty);
493 }
494 }
497 if (Arguments::has_alloc_profile()) {
498 HandleMark hm;
499 // Do one last collection to enumerate all the objects
500 // allocated since the last one.
501 Universe::heap()->collect(GCCause::_allocation_profiler);
502 AllocationProfiler::disengage();
503 AllocationProfiler::print(0);
504 }
506 if (PrintBytecodeHistogram) {
507 BytecodeHistogram::print();
508 }
510 if (JvmtiExport::should_post_thread_life()) {
511 JvmtiExport::post_thread_end(thread);
512 }
514 EVENT_BEGIN(TraceEventThreadEnd, event);
515 EVENT_COMMIT(event,
516 EVENT_SET(event, javalangthread, java_lang_Thread::thread_id(thread->threadObj())));
518 // Always call even when there are not JVMTI environments yet, since environments
519 // may be attached late and JVMTI must track phases of VM execution
520 JvmtiExport::post_vm_death();
521 Threads::shutdown_vm_agents();
523 // Terminate the signal thread
524 // Note: we don't wait until it actually dies.
525 os::terminate_signal_thread();
527 print_statistics();
528 Universe::heap()->print_tracing_info();
530 { MutexLocker ml(BeforeExit_lock);
531 _before_exit_status = BEFORE_EXIT_DONE;
532 BeforeExit_lock->notify_all();
533 }
535 #undef BEFORE_EXIT_NOT_RUN
536 #undef BEFORE_EXIT_RUNNING
537 #undef BEFORE_EXIT_DONE
538 }
540 void vm_exit(int code) {
541 Thread* thread = ThreadLocalStorage::is_initialized() ?
542 ThreadLocalStorage::get_thread_slow() : NULL;
543 if (thread == NULL) {
544 // we have serious problems -- just exit
545 vm_direct_exit(code);
546 }
548 if (VMThread::vm_thread() != NULL) {
549 // Fire off a VM_Exit operation to bring VM to a safepoint and exit
550 VM_Exit op(code);
551 if (thread->is_Java_thread())
552 ((JavaThread*)thread)->set_thread_state(_thread_in_vm);
553 VMThread::execute(&op);
554 // should never reach here; but in case something wrong with VM Thread.
555 vm_direct_exit(code);
556 } else {
557 // VM thread is gone, just exit
558 vm_direct_exit(code);
559 }
560 ShouldNotReachHere();
561 }
563 void notify_vm_shutdown() {
564 // For now, just a dtrace probe.
565 #ifndef USDT2
566 HS_DTRACE_PROBE(hotspot, vm__shutdown);
567 HS_DTRACE_WORKAROUND_TAIL_CALL_BUG();
568 #else /* USDT2 */
569 HOTSPOT_VM_SHUTDOWN();
570 #endif /* USDT2 */
571 }
573 void vm_direct_exit(int code) {
574 notify_vm_shutdown();
575 os::wait_for_keypress_at_exit();
576 ::exit(code);
577 }
579 void vm_perform_shutdown_actions() {
580 // Warning: do not call 'exit_globals()' here. All threads are still running.
581 // Calling 'exit_globals()' will disable thread-local-storage and cause all
582 // kinds of assertions to trigger in debug mode.
583 if (is_init_completed()) {
584 Thread* thread = ThreadLocalStorage::is_initialized() ?
585 ThreadLocalStorage::get_thread_slow() : NULL;
586 if (thread != NULL && thread->is_Java_thread()) {
587 // We are leaving the VM, set state to native (in case any OS exit
588 // handlers call back to the VM)
589 JavaThread* jt = (JavaThread*)thread;
590 // Must always be walkable or have no last_Java_frame when in
591 // thread_in_native
592 jt->frame_anchor()->make_walkable(jt);
593 jt->set_thread_state(_thread_in_native);
594 }
595 }
596 notify_vm_shutdown();
597 }
599 void vm_shutdown()
600 {
601 vm_perform_shutdown_actions();
602 os::wait_for_keypress_at_exit();
603 os::shutdown();
604 }
606 void vm_abort(bool dump_core) {
607 vm_perform_shutdown_actions();
608 os::wait_for_keypress_at_exit();
609 os::abort(dump_core);
610 ShouldNotReachHere();
611 }
613 void vm_notify_during_shutdown(const char* error, const char* message) {
614 if (error != NULL) {
615 tty->print_cr("Error occurred during initialization of VM");
616 tty->print("%s", error);
617 if (message != NULL) {
618 tty->print_cr(": %s", message);
619 }
620 else {
621 tty->cr();
622 }
623 }
624 if (ShowMessageBoxOnError && WizardMode) {
625 fatal("Error occurred during initialization of VM");
626 }
627 }
629 void vm_exit_during_initialization(Handle exception) {
630 tty->print_cr("Error occurred during initialization of VM");
631 // If there are exceptions on this thread it must be cleared
632 // first and here. Any future calls to EXCEPTION_MARK requires
633 // that no pending exceptions exist.
634 Thread *THREAD = Thread::current();
635 if (HAS_PENDING_EXCEPTION) {
636 CLEAR_PENDING_EXCEPTION;
637 }
638 java_lang_Throwable::print(exception, tty);
639 tty->cr();
640 java_lang_Throwable::print_stack_trace(exception(), tty);
641 tty->cr();
642 vm_notify_during_shutdown(NULL, NULL);
644 // Failure during initialization, we don't want to dump core
645 vm_abort(false);
646 }
648 void vm_exit_during_initialization(Symbol* ex, const char* message) {
649 ResourceMark rm;
650 vm_notify_during_shutdown(ex->as_C_string(), message);
652 // Failure during initialization, we don't want to dump core
653 vm_abort(false);
654 }
656 void vm_exit_during_initialization(const char* error, const char* message) {
657 vm_notify_during_shutdown(error, message);
659 // Failure during initialization, we don't want to dump core
660 vm_abort(false);
661 }
663 void vm_shutdown_during_initialization(const char* error, const char* message) {
664 vm_notify_during_shutdown(error, message);
665 vm_shutdown();
666 }
668 JDK_Version JDK_Version::_current;
669 const char* JDK_Version::_runtime_name;
671 void JDK_Version::initialize() {
672 jdk_version_info info;
673 assert(!_current.is_valid(), "Don't initialize twice");
675 void *lib_handle = os::native_java_library();
676 jdk_version_info_fn_t func = CAST_TO_FN_PTR(jdk_version_info_fn_t,
677 os::dll_lookup(lib_handle, "JDK_GetVersionInfo0"));
679 if (func == NULL) {
680 // JDK older than 1.6
681 _current._partially_initialized = true;
682 } else {
683 (*func)(&info, sizeof(info));
685 int major = JDK_VERSION_MAJOR(info.jdk_version);
686 int minor = JDK_VERSION_MINOR(info.jdk_version);
687 int micro = JDK_VERSION_MICRO(info.jdk_version);
688 int build = JDK_VERSION_BUILD(info.jdk_version);
689 if (major == 1 && minor > 4) {
690 // We represent "1.5.0" as "5.0", but 1.4.2 as itself.
691 major = minor;
692 minor = micro;
693 micro = 0;
694 }
695 _current = JDK_Version(major, minor, micro, info.update_version,
696 info.special_update_version, build,
697 info.thread_park_blocker == 1,
698 info.post_vm_init_hook_enabled == 1,
699 info.pending_list_uses_discovered_field == 1);
700 }
701 }
703 void JDK_Version::fully_initialize(
704 uint8_t major, uint8_t minor, uint8_t micro, uint8_t update) {
705 // This is only called when current is less than 1.6 and we've gotten
706 // far enough in the initialization to determine the exact version.
707 assert(major < 6, "not needed for JDK version >= 6");
708 assert(is_partially_initialized(), "must not initialize");
709 if (major < 5) {
710 // JDK verison sequence: 1.2.x, 1.3.x, 1.4.x, 5.0.x, 6.0.x, etc.
711 micro = minor;
712 minor = major;
713 major = 1;
714 }
715 _current = JDK_Version(major, minor, micro, update);
716 }
718 void JDK_Version_init() {
719 JDK_Version::initialize();
720 }
722 static int64_t encode_jdk_version(const JDK_Version& v) {
723 return
724 ((int64_t)v.major_version() << (BitsPerByte * 5)) |
725 ((int64_t)v.minor_version() << (BitsPerByte * 4)) |
726 ((int64_t)v.micro_version() << (BitsPerByte * 3)) |
727 ((int64_t)v.update_version() << (BitsPerByte * 2)) |
728 ((int64_t)v.special_update_version() << (BitsPerByte * 1)) |
729 ((int64_t)v.build_number() << (BitsPerByte * 0));
730 }
732 int JDK_Version::compare(const JDK_Version& other) const {
733 assert(is_valid() && other.is_valid(), "Invalid version (uninitialized?)");
734 if (!is_partially_initialized() && other.is_partially_initialized()) {
735 return -(other.compare(*this)); // flip the comparators
736 }
737 assert(!other.is_partially_initialized(), "Not initialized yet");
738 if (is_partially_initialized()) {
739 assert(other.major_version() >= 6,
740 "Invalid JDK version comparison during initialization");
741 return -1;
742 } else {
743 uint64_t e = encode_jdk_version(*this);
744 uint64_t o = encode_jdk_version(other);
745 return (e > o) ? 1 : ((e == o) ? 0 : -1);
746 }
747 }
749 void JDK_Version::to_string(char* buffer, size_t buflen) const {
750 size_t index = 0;
751 if (!is_valid()) {
752 jio_snprintf(buffer, buflen, "%s", "(uninitialized)");
753 } else if (is_partially_initialized()) {
754 jio_snprintf(buffer, buflen, "%s", "(uninitialized) pre-1.6.0");
755 } else {
756 index += jio_snprintf(
757 &buffer[index], buflen - index, "%d.%d", _major, _minor);
758 if (_micro > 0) {
759 index += jio_snprintf(&buffer[index], buflen - index, ".%d", _micro);
760 }
761 if (_update > 0) {
762 index += jio_snprintf(&buffer[index], buflen - index, "_%02d", _update);
763 }
764 if (_special > 0) {
765 index += jio_snprintf(&buffer[index], buflen - index, "%c", _special);
766 }
767 if (_build > 0) {
768 index += jio_snprintf(&buffer[index], buflen - index, "-b%02d", _build);
769 }
770 }
771 }
