1 /*
2 * Copyright (c) 1997, 2018, 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 "jvm.h"
27 #include "aot/aotLoader.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/stringTable.hpp"
30 #include "classfile/systemDictionary.hpp"
31 #include "code/codeCache.hpp"
32 #include "compiler/compileBroker.hpp"
33 #include "compiler/compilerOracle.hpp"
34 #include "gc/shared/genCollectedHeap.hpp"
35 #include "interpreter/bytecodeHistogram.hpp"
36 #if INCLUDE_JVMCI
37 #include "jvmci/jvmciCompiler.hpp"
38 #include "jvmci/jvmciRuntime.hpp"
39 #endif
40 #include "logging/log.hpp"
41 #include "logging/logStream.hpp"
42 #include "memory/oopFactory.hpp"
43 #include "memory/resourceArea.hpp"
44 #include "memory/universe.hpp"
45 #include "oops/constantPool.hpp"
46 #include "oops/generateOopMap.hpp"
47 #include "oops/instanceKlass.hpp"
48 #include "oops/instanceOop.hpp"
49 #include "oops/method.hpp"
50 #include "oops/objArrayOop.hpp"
51 #include "oops/oop.inline.hpp"
52 #include "oops/symbol.hpp"
53 #include "prims/jvmtiExport.hpp"
54 #include "runtime/arguments.hpp"
55 #include "runtime/biasedLocking.hpp"
56 #include "runtime/compilationPolicy.hpp"
57 #include "runtime/deoptimization.hpp"
58 #include "runtime/init.hpp"
59 #include "runtime/interfaceSupport.inline.hpp"
60 #include "runtime/java.hpp"
61 #include "runtime/memprofiler.hpp"
62 #include "runtime/sharedRuntime.hpp"
63 #include "runtime/statSampler.hpp"
64 #include "runtime/sweeper.hpp"
65 #include "runtime/task.hpp"
66 #include "runtime/thread.inline.hpp"
67 #include "runtime/timer.hpp"
68 #include "runtime/vm_operations.hpp"
69 #include "services/memTracker.hpp"
70 #include "trace/traceMacros.hpp"
71 #include "trace/tracing.hpp"
72 #include "utilities/dtrace.hpp"
73 #include "utilities/globalDefinitions.hpp"
74 #include "utilities/histogram.hpp"
75 #include "utilities/macros.hpp"
76 #include "utilities/vmError.hpp"
77 #if INCLUDE_ALL_GCS
78 #include "gc/cms/concurrentMarkSweepThread.hpp"
79 #include "gc/parallel/psScavenge.hpp"
80 #endif // INCLUDE_ALL_GCS
81 #ifdef COMPILER1
82 #include "c1/c1_Compiler.hpp"
83 #include "c1/c1_Runtime1.hpp"
84 #endif
85 #ifdef COMPILER2
86 #include "code/compiledIC.hpp"
87 #include "compiler/methodLiveness.hpp"
88 #include "opto/compile.hpp"
89 #include "opto/indexSet.hpp"
90 #include "opto/runtime.hpp"
91 #endif
92
93 GrowableArray<Method*>* collected_profiled_methods;
94
95 int compare_methods(Method** a, Method** b) {
96 // %%% there can be 32-bit overflow here
97 return ((*b)->invocation_count() + (*b)->compiled_invocation_count())
98 - ((*a)->invocation_count() + (*a)->compiled_invocation_count());
99 }
100
101 void collect_profiled_methods(Method* m) {
102 Thread* thread = Thread::current();
103 methodHandle mh(thread, m);
104 if ((m->method_data() != NULL) &&
105 (PrintMethodData || CompilerOracle::should_print(mh))) {
106 collected_profiled_methods->push(m);
107 }
108 }
109
110 void print_method_profiling_data() {
111 if (ProfileInterpreter COMPILER1_PRESENT(|| C1UpdateMethodData) &&
112 (PrintMethodData || CompilerOracle::should_print_methods())) {
113 ResourceMark rm;
114 HandleMark hm;
115 collected_profiled_methods = new GrowableArray<Method*>(1024);
116 SystemDictionary::methods_do(collect_profiled_methods);
117 collected_profiled_methods->sort(&compare_methods);
118
119 int count = collected_profiled_methods->length();
120 int total_size = 0;
121 if (count > 0) {
122 for (int index = 0; index < count; index++) {
123 Method* m = collected_profiled_methods->at(index);
124 ttyLocker ttyl;
125 tty->print_cr("------------------------------------------------------------------------");
126 m->print_invocation_count();
127 tty->print_cr(" mdo size: %d bytes", m->method_data()->size_in_bytes());
128 tty->cr();
129 // Dump data on parameters if any
130 if (m->method_data() != NULL && m->method_data()->parameters_type_data() != NULL) {
131 tty->fill_to(2);
132 m->method_data()->parameters_type_data()->print_data_on(tty);
133 }
134 m->print_codes();
135 total_size += m->method_data()->size_in_bytes();
136 }
137 tty->print_cr("------------------------------------------------------------------------");
138 tty->print_cr("Total MDO size: %d bytes", total_size);
139 }
140 }
141 }
142
143
144 #ifndef PRODUCT
145
146 // Statistics printing (method invocation histogram)
147
148 GrowableArray<Method*>* collected_invoked_methods;
149
150 void collect_invoked_methods(Method* m) {
151 if (m->invocation_count() + m->compiled_invocation_count() >= 1 ) {
152 collected_invoked_methods->push(m);
153 }
154 }
155
156
157
158
159 void print_method_invocation_histogram() {
160 ResourceMark rm;
161 HandleMark hm;
162 collected_invoked_methods = new GrowableArray<Method*>(1024);
163 SystemDictionary::methods_do(collect_invoked_methods);
164 collected_invoked_methods->sort(&compare_methods);
165 //
166 tty->cr();
167 tty->print_cr("Histogram Over Method Invocation Counters (cutoff = " INTX_FORMAT "):", MethodHistogramCutoff);
168 tty->cr();
169 tty->print_cr("____Count_(I+C)____Method________________________Module_________________");
170 unsigned total = 0, int_total = 0, comp_total = 0, static_total = 0, final_total = 0,
171 synch_total = 0, nativ_total = 0, acces_total = 0;
172 for (int index = 0; index < collected_invoked_methods->length(); index++) {
173 Method* m = collected_invoked_methods->at(index);
174 int c = m->invocation_count() + m->compiled_invocation_count();
175 if (c >= MethodHistogramCutoff) m->print_invocation_count();
176 int_total += m->invocation_count();
177 comp_total += m->compiled_invocation_count();
178 if (m->is_final()) final_total += c;
179 if (m->is_static()) static_total += c;
180 if (m->is_synchronized()) synch_total += c;
181 if (m->is_native()) nativ_total += c;
182 if (m->is_accessor()) acces_total += c;
183 }
184 tty->cr();
185 total = int_total + comp_total;
186 tty->print_cr("Invocations summary:");
187 tty->print_cr("\t%9d (%4.1f%%) interpreted", int_total, 100.0 * int_total / total);
188 tty->print_cr("\t%9d (%4.1f%%) compiled", comp_total, 100.0 * comp_total / total);
189 tty->print_cr("\t%9d (100%%) total", total);
190 tty->print_cr("\t%9d (%4.1f%%) synchronized", synch_total, 100.0 * synch_total / total);
191 tty->print_cr("\t%9d (%4.1f%%) final", final_total, 100.0 * final_total / total);
192 tty->print_cr("\t%9d (%4.1f%%) static", static_total, 100.0 * static_total / total);
193 tty->print_cr("\t%9d (%4.1f%%) native", nativ_total, 100.0 * nativ_total / total);
194 tty->print_cr("\t%9d (%4.1f%%) accessor", acces_total, 100.0 * acces_total / total);
195 tty->cr();
196 SharedRuntime::print_call_statistics(comp_total);
197 }
198
199 void print_bytecode_count() {
200 if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
201 tty->print_cr("[BytecodeCounter::counter_value = %d]", BytecodeCounter::counter_value());
202 }
203 }
204
205 AllocStats alloc_stats;
206
207
208
209 // General statistics printing (profiling ...)
210 void print_statistics() {
211 #ifdef ASSERT
212
213 if (CountRuntimeCalls) {
214 extern Histogram *RuntimeHistogram;
215 RuntimeHistogram->print();
216 }
217
218 if (CountJNICalls) {
219 extern Histogram *JNIHistogram;
220 JNIHistogram->print();
221 }
222
223 if (CountJVMCalls) {
224 extern Histogram *JVMHistogram;
225 JVMHistogram->print();
226 }
227
228 #endif
229
230 if (MemProfiling) {
231 MemProfiler::disengage();
232 }
233
234 if (CITime) {
235 CompileBroker::print_times();
236 }
237
238 #ifdef COMPILER1
239 if ((PrintC1Statistics || LogVMOutput || LogCompilation) && UseCompiler) {
240 FlagSetting fs(DisplayVMOutput, DisplayVMOutput && PrintC1Statistics);
241 Runtime1::print_statistics();
242 Deoptimization::print_statistics();
243 SharedRuntime::print_statistics();
244 }
245 #endif /* COMPILER1 */
246
247 #ifdef COMPILER2
248 if ((PrintOptoStatistics || LogVMOutput || LogCompilation) && UseCompiler) {
249 FlagSetting fs(DisplayVMOutput, DisplayVMOutput && PrintOptoStatistics);
250 Compile::print_statistics();
251 #ifndef COMPILER1
252 Deoptimization::print_statistics();
253 SharedRuntime::print_statistics();
254 #endif //COMPILER1
255 os::print_statistics();
256 }
257
258 if (PrintLockStatistics || PrintPreciseBiasedLockingStatistics || PrintPreciseRTMLockingStatistics) {
259 OptoRuntime::print_named_counters();
260 }
261
262 if (TimeLivenessAnalysis) {
263 MethodLiveness::print_times();
264 }
265 #ifdef ASSERT
266 if (CollectIndexSetStatistics) {
267 IndexSet::print_statistics();
268 }
269 #endif // ASSERT
270 #else
271 #ifdef INCLUDE_JVMCI
272 #ifndef COMPILER1
273 if ((TraceDeoptimization || LogVMOutput || LogCompilation) && UseCompiler) {
274 FlagSetting fs(DisplayVMOutput, DisplayVMOutput && TraceDeoptimization);
275 Deoptimization::print_statistics();
276 SharedRuntime::print_statistics();
277 }
278 #endif
279 #endif
280 #endif
281
282 if (PrintAOTStatistics) {
283 AOTLoader::print_statistics();
284 }
285
286 if (PrintNMethodStatistics) {
287 nmethod::print_statistics();
288 }
289 if (CountCompiledCalls) {
290 print_method_invocation_histogram();
291 }
292
293 print_method_profiling_data();
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 }
313
314 if (PrintCodeCache) {
315 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
316 CodeCache::print();
317 }
318
319 // CodeHeap State Analytics.
320 // Does also call NMethodSweeper::print(tty)
321 LogTarget(Trace, codecache) lt;
322 if (lt.is_enabled()) {
323 CompileBroker::print_heapinfo(NULL, "all", "4096"); // details
324 } else if (PrintMethodFlushingStatistics) {
325 NMethodSweeper::print(tty);
326 }
327
328 if (PrintCodeCache2) {
329 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
330 CodeCache::print_internals();
331 }
332
333 if (PrintVtableStats) {
334 klassVtable::print_statistics();
335 klassItable::print_statistics();
336 }
337 if (VerifyOops) {
338 tty->print_cr("+VerifyOops count: %d", StubRoutines::verify_oop_count());
339 }
340
341 print_bytecode_count();
342 if (PrintMallocStatistics) {
343 tty->print("allocation stats: ");
344 alloc_stats.print();
345 tty->cr();
346 }
347
348 if (PrintSystemDictionaryAtExit) {
349 ResourceMark rm;
350 SystemDictionary::print();
351 ClassLoaderDataGraph::print();
352 }
353
354 if (LogTouchedMethods && PrintTouchedMethodsAtExit) {
355 Method::print_touched_methods(tty);
356 }
357
358 if (PrintBiasedLockingStatistics) {
359 BiasedLocking::print_counters();
360 }
361
362 // Native memory tracking data
363 if (PrintNMTStatistics) {
364 MemTracker::final_report(tty);
365 }
366
367 ThreadsSMRSupport::log_statistics();
368 }
369
370 #else // PRODUCT MODE STATISTICS
371
372 void print_statistics() {
373
374 if (PrintMethodData) {
375 print_method_profiling_data();
376 }
377
378 if (CITime) {
379 CompileBroker::print_times();
380 }
381
382 if (PrintCodeCache) {
383 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
384 CodeCache::print();
385 }
386
387 // CodeHeap State Analytics.
388 // Does also call NMethodSweeper::print(tty)
389 LogTarget(Trace, codecache) lt;
390 if (lt.is_enabled()) {
391 CompileBroker::print_heapinfo(NULL, "all", "4096"); // details
392 } else if (PrintMethodFlushingStatistics) {
393 NMethodSweeper::print(tty);
394 }
395
396 #ifdef COMPILER2
397 if (PrintPreciseBiasedLockingStatistics || PrintPreciseRTMLockingStatistics) {
398 OptoRuntime::print_named_counters();
399 }
400 #endif
401 if (PrintBiasedLockingStatistics) {
402 BiasedLocking::print_counters();
403 }
404
405 // Native memory tracking data
406 if (PrintNMTStatistics) {
407 MemTracker::final_report(tty);
408 }
409
410 if (LogTouchedMethods && PrintTouchedMethodsAtExit) {
411 Method::print_touched_methods(tty);
412 }
413
414 ThreadsSMRSupport::log_statistics();
415 }
416
417 #endif
418
419 // Note: before_exit() can be executed only once, if more than one threads
420 // are trying to shutdown the VM at the same time, only one thread
421 // can run before_exit() and all other threads must wait.
422 void before_exit(JavaThread* thread) {
423 #define BEFORE_EXIT_NOT_RUN 0
424 #define BEFORE_EXIT_RUNNING 1
425 #define BEFORE_EXIT_DONE 2
426 static jint volatile _before_exit_status = BEFORE_EXIT_NOT_RUN;
427
428 // Note: don't use a Mutex to guard the entire before_exit(), as
429 // JVMTI post_thread_end_event and post_vm_death_event will run native code.
430 // A CAS or OSMutex would work just fine but then we need to manipulate
431 // thread state for Safepoint. Here we use Monitor wait() and notify_all()
432 // for synchronization.
433 { MutexLocker ml(BeforeExit_lock);
434 switch (_before_exit_status) {
435 case BEFORE_EXIT_NOT_RUN:
436 _before_exit_status = BEFORE_EXIT_RUNNING;
437 break;
438 case BEFORE_EXIT_RUNNING:
439 while (_before_exit_status == BEFORE_EXIT_RUNNING) {
440 BeforeExit_lock->wait();
441 }
442 assert(_before_exit_status == BEFORE_EXIT_DONE, "invalid state");
443 return;
444 case BEFORE_EXIT_DONE:
445 // need block to avoid SS compiler bug
446 {
447 return;
448 }
449 }
450 }
451
452 #if INCLUDE_JVMCI
453 // We are not using CATCH here because we want the exit to continue normally.
454 Thread* THREAD = thread;
455 JVMCIRuntime::shutdown(THREAD);
456 if (HAS_PENDING_EXCEPTION) {
457 HandleMark hm(THREAD);
458 Handle exception(THREAD, PENDING_EXCEPTION);
459 CLEAR_PENDING_EXCEPTION;
460 java_lang_Throwable::java_printStackTrace(exception, THREAD);
461 }
462 #endif
463
464 // Hang forever on exit if we're reporting an error.
465 if (ShowMessageBoxOnError && VMError::is_error_reported()) {
466 os::infinite_sleep();
467 }
468
469 EventThreadEnd event;
470 if (event.should_commit()) {
471 event.set_thread(THREAD_TRACE_ID(thread));
472 event.commit();
473 }
474
475 TRACE_VM_EXIT();
476
477 // Stop the WatcherThread. We do this before disenrolling various
478 // PeriodicTasks to reduce the likelihood of races.
479 if (PeriodicTask::num_tasks() > 0) {
480 WatcherThread::stop();
481 }
482
483 // shut down the StatSampler task
484 StatSampler::disengage();
485 StatSampler::destroy();
486
487 // Stop concurrent GC threads
488 Universe::heap()->stop();
489
490 // Print GC/heap related information.
491 Log(gc, heap, exit) log;
492 if (log.is_info()) {
493 ResourceMark rm;
494 LogStream ls_info(log.info());
495 Universe::print_on(&ls_info);
496 if (log.is_trace()) {
497 LogStream ls_trace(log.trace());
498 ClassLoaderDataGraph::print_on(&ls_trace);
499 }
500 }
501
502 if (PrintBytecodeHistogram) {
503 BytecodeHistogram::print();
504 }
505
506 if (JvmtiExport::should_post_thread_life()) {
507 JvmtiExport::post_thread_end(thread);
508 }
509
510 // Always call even when there are not JVMTI environments yet, since environments
511 // may be attached late and JVMTI must track phases of VM execution
512 JvmtiExport::post_vm_death();
513 Threads::shutdown_vm_agents();
514
515 // Terminate the signal thread
516 // Note: we don't wait until it actually dies.
517 os::terminate_signal_thread();
518
519 print_statistics();
520 Universe::heap()->print_tracing_info();
521
522 { MutexLocker ml(BeforeExit_lock);
523 _before_exit_status = BEFORE_EXIT_DONE;
524 BeforeExit_lock->notify_all();
525 }
526
527 if (VerifyStringTableAtExit) {
528 int fail_cnt = 0;
529 {
530 MutexLocker ml(StringTable_lock);
531 fail_cnt = StringTable::verify_and_compare_entries();
532 }
533
534 if (fail_cnt != 0) {
535 tty->print_cr("ERROR: fail_cnt=%d", fail_cnt);
536 guarantee(fail_cnt == 0, "unexpected StringTable verification failures");
537 }
538 }
539
540 #undef BEFORE_EXIT_NOT_RUN
541 #undef BEFORE_EXIT_RUNNING
542 #undef BEFORE_EXIT_DONE
543 }
544
545 void vm_exit(int code) {
546 Thread* thread =
547 ThreadLocalStorage::is_initialized() ? Thread::current_or_null() : NULL;
548 if (thread == NULL) {
549 // very early initialization failure -- just exit
550 vm_direct_exit(code);
551 }
552
553 if (VMThread::vm_thread() != NULL) {
554 // Fire off a VM_Exit operation to bring VM to a safepoint and exit
555 VM_Exit op(code);
556 if (thread->is_Java_thread())
557 ((JavaThread*)thread)->set_thread_state(_thread_in_vm);
558 VMThread::execute(&op);
559 // should never reach here; but in case something wrong with VM Thread.
560 vm_direct_exit(code);
561 } else {
562 // VM thread is gone, just exit
563 vm_direct_exit(code);
564 }
565 ShouldNotReachHere();
566 }
567
568 void notify_vm_shutdown() {
569 // For now, just a dtrace probe.
570 HOTSPOT_VM_SHUTDOWN();
571 HS_DTRACE_WORKAROUND_TAIL_CALL_BUG();
572 }
573
574 void vm_direct_exit(int code) {
575 notify_vm_shutdown();
576 os::wait_for_keypress_at_exit();
577 os::exit(code);
578 }
579
580 void vm_perform_shutdown_actions() {
581 // Warning: do not call 'exit_globals()' here. All threads are still running.
582 // Calling 'exit_globals()' will disable thread-local-storage and cause all
583 // kinds of assertions to trigger in debug mode.
584 if (is_init_completed()) {
585 Thread* thread = Thread::current_or_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 }
598
599 void vm_shutdown()
600 {
601 vm_perform_shutdown_actions();
602 os::wait_for_keypress_at_exit();
603 os::shutdown();
604 }
605
606 void vm_abort(bool dump_core) {
607 vm_perform_shutdown_actions();
608 os::wait_for_keypress_at_exit();
609
610 // Flush stdout and stderr before abort.
611 fflush(stdout);
612 fflush(stderr);
613
614 os::abort(dump_core);
615 ShouldNotReachHere();
616 }
617
618 void vm_notify_during_shutdown(const char* error, const char* message) {
619 if (error != NULL) {
620 tty->print_cr("Error occurred during initialization of VM");
621 tty->print("%s", error);
622 if (message != NULL) {
623 tty->print_cr(": %s", message);
624 }
625 else {
626 tty->cr();
627 }
628 }
629 if (ShowMessageBoxOnError && WizardMode) {
630 fatal("Error occurred during initialization of VM");
631 }
632 }
633
634 void vm_exit_during_initialization() {
635 vm_notify_during_shutdown(NULL, NULL);
636
637 // Failure during initialization, we don't want to dump core
638 vm_abort(false);
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(); // can't be NULL
647 if (HAS_PENDING_EXCEPTION) {
648 CLEAR_PENDING_EXCEPTION;
649 }
650 java_lang_Throwable::print_stack_trace(exception, tty);
651 tty->cr();
652 vm_notify_during_shutdown(NULL, NULL);
653
654 // Failure during initialization, we don't want to dump core
655 vm_abort(false);
656 }
657
658 void vm_exit_during_initialization(Symbol* ex, const char* message) {
659 ResourceMark rm;
660 vm_notify_during_shutdown(ex->as_C_string(), message);
661
662 // Failure during initialization, we don't want to dump core
663 vm_abort(false);
664 }
665
666 void vm_exit_during_initialization(const char* error, const char* message) {
667 vm_notify_during_shutdown(error, message);
668
669 // Failure during initialization, we don't want to dump core
670 vm_abort(false);
671 }
672
673 void vm_shutdown_during_initialization(const char* error, const char* message) {
674 vm_notify_during_shutdown(error, message);
675 vm_shutdown();
676 }
677
678 JDK_Version JDK_Version::_current;
679 const char* JDK_Version::_runtime_name;
680 const char* JDK_Version::_runtime_version;
681
682 void JDK_Version::initialize() {
683 jdk_version_info info;
684 assert(!_current.is_valid(), "Don't initialize twice");
685
686 void *lib_handle = os::native_java_library();
687 jdk_version_info_fn_t func = CAST_TO_FN_PTR(jdk_version_info_fn_t,
688 os::dll_lookup(lib_handle, "JDK_GetVersionInfo0"));
689
690 assert(func != NULL, "Support for JDK 1.5 or older has been removed after JEP-223");
691
692 (*func)(&info, sizeof(info));
693
694 int major = JDK_VERSION_MAJOR(info.jdk_version);
695 int minor = JDK_VERSION_MINOR(info.jdk_version);
696 int security = JDK_VERSION_SECURITY(info.jdk_version);
697 int build = JDK_VERSION_BUILD(info.jdk_version);
698
699 // Incompatible with pre-4243978 JDK.
700 if (info.pending_list_uses_discovered_field == 0) {
701 vm_exit_during_initialization(
702 "Incompatible JDK is not using Reference.discovered field for pending list");
703 }
704 _current = JDK_Version(major, minor, security, info.patch_version, build,
705 info.thread_park_blocker == 1,
706 info.post_vm_init_hook_enabled == 1);
707 }
708
709 void JDK_Version_init() {
710 JDK_Version::initialize();
711 }
712
713 static int64_t encode_jdk_version(const JDK_Version& v) {
714 return
715 ((int64_t)v.major_version() << (BitsPerByte * 4)) |
716 ((int64_t)v.minor_version() << (BitsPerByte * 3)) |
717 ((int64_t)v.security_version() << (BitsPerByte * 2)) |
718 ((int64_t)v.patch_version() << (BitsPerByte * 1)) |
719 ((int64_t)v.build_number() << (BitsPerByte * 0));
720 }
721
722 int JDK_Version::compare(const JDK_Version& other) const {
723 assert(is_valid() && other.is_valid(), "Invalid version (uninitialized?)");
724 uint64_t e = encode_jdk_version(*this);
725 uint64_t o = encode_jdk_version(other);
726 return (e > o) ? 1 : ((e == o) ? 0 : -1);
727 }
728
729 void JDK_Version::to_string(char* buffer, size_t buflen) const {
730 assert(buffer && buflen > 0, "call with useful buffer");
731 size_t index = 0;
732
733 if (!is_valid()) {
734 jio_snprintf(buffer, buflen, "%s", "(uninitialized)");
735 } else {
736 int rc = jio_snprintf(
737 &buffer[index], buflen - index, "%d.%d", _major, _minor);
738 if (rc == -1) return;
739 index += rc;
740 if (_security > 0) {
741 rc = jio_snprintf(&buffer[index], buflen - index, ".%d", _security);
742 if (rc == -1) return;
743 index += rc;
744 }
745 if (_patch > 0) {
746 rc = jio_snprintf(&buffer[index], buflen - index, ".%d", _patch);
747 if (rc == -1) return;
748 index += rc;
749 }
750 if (_build > 0) {
751 rc = jio_snprintf(&buffer[index], buflen - index, "+%d", _build);
752 if (rc == -1) return;
753 index += rc;
754 }
755 }
756 }