1 /*
2 * Copyright (c) 1997, 2015, 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 "gc/shared/genCollectedHeap.hpp"
33 #include "interpreter/bytecodeHistogram.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/cms/concurrentMarkSweepThread.hpp"
69 #include "gc/parallel/psScavenge.hpp"
70 #endif // INCLUDE_ALL_GCS
71 #ifdef COMPILER1
72 #include "c1/c1_Compiler.hpp"
73 #include "c1/c1_Runtime1.hpp"
74 #endif
75 #ifdef COMPILER2
76 #include "code/compiledIC.hpp"
77 #include "compiler/methodLiveness.hpp"
78 #include "opto/compile.hpp"
79 #include "opto/indexSet.hpp"
80 #include "opto/runtime.hpp"
81 #endif
82
83 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
84
85 GrowableArray<Method*>* collected_profiled_methods;
86
87 int compare_methods(Method** a, Method** b) {
88 // %%% there can be 32-bit overflow here
89 return ((*b)->invocation_count() + (*b)->compiled_invocation_count())
90 - ((*a)->invocation_count() + (*a)->compiled_invocation_count());
91 }
92
93 void collect_profiled_methods(Method* m) {
94 Thread* thread = Thread::current();
95 // This HandleMark prevents a huge amount of handles from being added
96 // to the metadata_handles() array on the thread.
97 HandleMark hm(thread);
98 methodHandle mh(thread, m);
99 if ((m->method_data() != NULL) &&
100 (PrintMethodData || CompilerOracle::should_print(mh))) {
101 collected_profiled_methods->push(m);
102 }
103 }
104
105 void print_method_profiling_data() {
106 if (ProfileInterpreter COMPILER1_PRESENT(|| C1UpdateMethodData) &&
107 (PrintMethodData || CompilerOracle::should_print_methods())) {
108 ResourceMark rm;
109 HandleMark hm;
110 collected_profiled_methods = new GrowableArray<Method*>(1024);
111 ClassLoaderDataGraph::methods_do(collect_profiled_methods);
112 collected_profiled_methods->sort(&compare_methods);
113
114 int count = collected_profiled_methods->length();
115 int total_size = 0;
116 if (count > 0) {
117 for (int index = 0; index < count; index++) {
118 Method* m = collected_profiled_methods->at(index);
119 ttyLocker ttyl;
120 tty->print_cr("------------------------------------------------------------------------");
121 m->print_invocation_count();
122 tty->print_cr(" mdo size: %d bytes", m->method_data()->size_in_bytes());
123 tty->cr();
124 // Dump data on parameters if any
125 if (m->method_data() != NULL && m->method_data()->parameters_type_data() != NULL) {
126 tty->fill_to(2);
127 m->method_data()->parameters_type_data()->print_data_on(tty);
128 }
129 m->print_codes();
130 total_size += m->method_data()->size_in_bytes();
131 }
132 tty->print_cr("------------------------------------------------------------------------");
133 tty->print_cr("Total MDO size: %d bytes", total_size);
134 }
135 }
136 }
137
138
139 #ifndef PRODUCT
140
141 // Statistics printing (method invocation histogram)
142
143 GrowableArray<Method*>* collected_invoked_methods;
144
145 void collect_invoked_methods(Method* m) {
146 if (m->invocation_count() + m->compiled_invocation_count() >= 1 ) {
147 collected_invoked_methods->push(m);
148 }
149 }
150
151
152
153
154 void print_method_invocation_histogram() {
155 ResourceMark rm;
156 HandleMark hm;
157 collected_invoked_methods = new GrowableArray<Method*>(1024);
158 SystemDictionary::methods_do(collect_invoked_methods);
159 collected_invoked_methods->sort(&compare_methods);
160 //
161 tty->cr();
162 tty->print_cr("Histogram Over MethodOop Invocation Counters (cutoff = %d):", MethodHistogramCutoff);
163 tty->cr();
164 tty->print_cr("____Count_(I+C)____Method________________________Module_________________");
165 unsigned total = 0, int_total = 0, comp_total = 0, static_total = 0, final_total = 0,
166 synch_total = 0, nativ_total = 0, acces_total = 0;
167 for (int index = 0; index < collected_invoked_methods->length(); index++) {
168 Method* m = collected_invoked_methods->at(index);
169 int c = m->invocation_count() + m->compiled_invocation_count();
170 if (c >= MethodHistogramCutoff) m->print_invocation_count();
171 int_total += m->invocation_count();
172 comp_total += m->compiled_invocation_count();
173 if (m->is_final()) final_total += c;
174 if (m->is_static()) static_total += c;
175 if (m->is_synchronized()) synch_total += c;
176 if (m->is_native()) nativ_total += c;
177 if (m->is_accessor()) acces_total += c;
178 }
179 tty->cr();
180 total = int_total + comp_total;
181 tty->print_cr("Invocations summary:");
182 tty->print_cr("\t%9d (%4.1f%%) interpreted", int_total, 100.0 * int_total / total);
183 tty->print_cr("\t%9d (%4.1f%%) compiled", comp_total, 100.0 * comp_total / total);
184 tty->print_cr("\t%9d (100%%) total", total);
185 tty->print_cr("\t%9d (%4.1f%%) synchronized", synch_total, 100.0 * synch_total / total);
186 tty->print_cr("\t%9d (%4.1f%%) final", final_total, 100.0 * final_total / total);
187 tty->print_cr("\t%9d (%4.1f%%) static", static_total, 100.0 * static_total / total);
188 tty->print_cr("\t%9d (%4.1f%%) native", nativ_total, 100.0 * nativ_total / total);
189 tty->print_cr("\t%9d (%4.1f%%) accessor", acces_total, 100.0 * acces_total / total);
190 tty->cr();
191 SharedRuntime::print_call_statistics(comp_total);
192 }
193
194 void print_bytecode_count() {
195 if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
196 tty->print_cr("[BytecodeCounter::counter_value = %d]", BytecodeCounter::counter_value());
197 }
198 }
199
200 AllocStats alloc_stats;
201
202
203
204 // General statistics printing (profiling ...)
205 void print_statistics() {
206 #ifdef ASSERT
207
208 if (CountRuntimeCalls) {
209 extern Histogram *RuntimeHistogram;
210 RuntimeHistogram->print();
211 }
212
213 if (CountJNICalls) {
214 extern Histogram *JNIHistogram;
215 JNIHistogram->print();
216 }
217
218 if (CountJVMCalls) {
219 extern Histogram *JVMHistogram;
220 JVMHistogram->print();
221 }
222
223 #endif
224
225 if (MemProfiling) {
226 MemProfiler::disengage();
227 }
228
229 if (CITime) {
230 CompileBroker::print_times();
231 }
232
233 #ifdef COMPILER1
234 if ((PrintC1Statistics || LogVMOutput || LogCompilation) && UseCompiler) {
235 FlagSetting fs(DisplayVMOutput, DisplayVMOutput && PrintC1Statistics);
236 Runtime1::print_statistics();
237 Deoptimization::print_statistics();
238 SharedRuntime::print_statistics();
239 nmethod::print_statistics();
240 }
241 #endif /* COMPILER1 */
242
243 #ifdef COMPILER2
244 if ((PrintOptoStatistics || LogVMOutput || LogCompilation) && UseCompiler) {
245 FlagSetting fs(DisplayVMOutput, DisplayVMOutput && PrintOptoStatistics);
246 Compile::print_statistics();
247 #ifndef COMPILER1
248 Deoptimization::print_statistics();
249 nmethod::print_statistics();
250 SharedRuntime::print_statistics();
251 #endif //COMPILER1
252 os::print_statistics();
253 }
254
255 if (PrintLockStatistics || PrintPreciseBiasedLockingStatistics || PrintPreciseRTMLockingStatistics) {
256 OptoRuntime::print_named_counters();
257 }
258
259 if (TimeLivenessAnalysis) {
260 MethodLiveness::print_times();
261 }
262 #ifdef ASSERT
263 if (CollectIndexSetStatistics) {
264 IndexSet::print_statistics();
265 }
266 #endif // ASSERT
267 #endif // COMPILER2
268 if (CountCompiledCalls) {
269 print_method_invocation_histogram();
270 }
271
272 print_method_profiling_data();
273
274 if (TimeCompilationPolicy) {
275 CompilationPolicy::policy()->print_time();
276 }
277 if (TimeOopMap) {
278 GenerateOopMap::print_time();
279 }
280 if (ProfilerCheckIntervals) {
281 PeriodicTask::print_intervals();
282 }
283 if (PrintSymbolTableSizeHistogram) {
284 SymbolTable::print_histogram();
285 }
286 if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
287 BytecodeCounter::print();
288 }
289 if (PrintBytecodePairHistogram) {
290 BytecodePairHistogram::print();
291 }
292
293 if (PrintCodeCache) {
294 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
295 CodeCache::print();
296 }
297
298 if (PrintMethodFlushingStatistics) {
299 NMethodSweeper::print();
300 }
301
302 if (PrintCodeCache2) {
303 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
304 CodeCache::print_internals();
305 }
306
307 if (PrintVtableStats) {
308 klassVtable::print_statistics();
309 klassItable::print_statistics();
310 }
311 if (VerifyOops) {
312 tty->print_cr("+VerifyOops count: %d", StubRoutines::verify_oop_count());
313 }
314
315 print_bytecode_count();
316 if (PrintMallocStatistics) {
317 tty->print("allocation stats: ");
318 alloc_stats.print();
319 tty->cr();
320 }
321
322 if (PrintSystemDictionaryAtExit) {
323 SystemDictionary::print();
324 }
325
326 if (LogTouchedMethods && PrintTouchedMethodsAtExit) {
327 Method::print_touched_methods(tty);
328 }
329
330 if (PrintBiasedLockingStatistics) {
331 BiasedLocking::print_counters();
332 }
333
334 // Native memory tracking data
335 if (PrintNMTStatistics) {
336 MemTracker::final_report(tty);
337 }
338 }
339
340 #else // PRODUCT MODE STATISTICS
341
342 void print_statistics() {
343
344 if (PrintMethodData) {
345 print_method_profiling_data();
346 }
347
348 if (CITime) {
349 CompileBroker::print_times();
350 }
351
352 if (PrintCodeCache) {
353 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
354 CodeCache::print();
355 }
356
357 if (PrintMethodFlushingStatistics) {
358 NMethodSweeper::print();
359 }
360
361 #ifdef COMPILER2
362 if (PrintPreciseBiasedLockingStatistics || PrintPreciseRTMLockingStatistics) {
363 OptoRuntime::print_named_counters();
364 }
365 #endif
366 if (PrintBiasedLockingStatistics) {
367 BiasedLocking::print_counters();
368 }
369
370 // Native memory tracking data
371 if (PrintNMTStatistics) {
372 MemTracker::final_report(tty);
373 }
374
375 if (LogTouchedMethods && PrintTouchedMethodsAtExit) {
376 Method::print_touched_methods(tty);
377 }
378 }
379
380 #endif
381
382 // Note: before_exit() can be executed only once, if more than one threads
383 // are trying to shutdown the VM at the same time, only one thread
384 // can run before_exit() and all other threads must wait.
385 void before_exit(JavaThread * thread) {
386 #define BEFORE_EXIT_NOT_RUN 0
387 #define BEFORE_EXIT_RUNNING 1
388 #define BEFORE_EXIT_DONE 2
389 static jint volatile _before_exit_status = BEFORE_EXIT_NOT_RUN;
390
391 // Note: don't use a Mutex to guard the entire before_exit(), as
392 // JVMTI post_thread_end_event and post_vm_death_event will run native code.
393 // A CAS or OSMutex would work just fine but then we need to manipulate
394 // thread state for Safepoint. Here we use Monitor wait() and notify_all()
395 // for synchronization.
396 { MutexLocker ml(BeforeExit_lock);
397 switch (_before_exit_status) {
398 case BEFORE_EXIT_NOT_RUN:
399 _before_exit_status = BEFORE_EXIT_RUNNING;
400 break;
401 case BEFORE_EXIT_RUNNING:
402 while (_before_exit_status == BEFORE_EXIT_RUNNING) {
403 BeforeExit_lock->wait();
404 }
405 assert(_before_exit_status == BEFORE_EXIT_DONE, "invalid state");
406 return;
407 case BEFORE_EXIT_DONE:
408 return;
409 }
410 }
411
412 // Hang forever on exit if we're reporting an error.
413 if (ShowMessageBoxOnError && is_error_reported()) {
414 os::infinite_sleep();
415 }
416
417 // Stop the WatcherThread. We do this before disenrolling various
418 // PeriodicTasks to reduce the likelihood of races.
419 if (PeriodicTask::num_tasks() > 0) {
420 WatcherThread::stop();
421 }
422
423 // Print statistics gathered (profiling ...)
424 if (Arguments::has_profile()) {
425 FlatProfiler::disengage();
426 FlatProfiler::print(10);
427 }
428
429 // shut down the StatSampler task
430 StatSampler::disengage();
431 StatSampler::destroy();
432
433 // Stop concurrent GC threads
434 Universe::heap()->stop();
435
436 // Print GC/heap related information.
437 if (PrintGCDetails) {
438 Universe::print();
439 AdaptiveSizePolicyOutput(0);
440 if (Verbose) {
441 ClassLoaderDataGraph::dump_on(gclog_or_tty);
442 }
443 }
444
445 if (PrintBytecodeHistogram) {
446 BytecodeHistogram::print();
447 }
448
449 if (JvmtiExport::should_post_thread_life()) {
450 JvmtiExport::post_thread_end(thread);
451 }
452
453
454 EventThreadEnd event;
455 if (event.should_commit()) {
456 event.set_javalangthread(java_lang_Thread::thread_id(thread->threadObj()));
457 event.commit();
458 }
459
460 // Always call even when there are not JVMTI environments yet, since environments
461 // may be attached late and JVMTI must track phases of VM execution
462 JvmtiExport::post_vm_death();
463 Threads::shutdown_vm_agents();
464
465 // Terminate the signal thread
466 // Note: we don't wait until it actually dies.
467 os::terminate_signal_thread();
468
469 print_statistics();
470 Universe::heap()->print_tracing_info();
471
472 { MutexLocker ml(BeforeExit_lock);
473 _before_exit_status = BEFORE_EXIT_DONE;
474 BeforeExit_lock->notify_all();
475 }
476
477 if (VerifyStringTableAtExit) {
478 int fail_cnt = 0;
479 {
480 MutexLocker ml(StringTable_lock);
481 fail_cnt = StringTable::verify_and_compare_entries();
482 }
483
484 if (fail_cnt != 0) {
485 tty->print_cr("ERROR: fail_cnt=%d", fail_cnt);
486 guarantee(fail_cnt == 0, "unexpected StringTable verification failures");
487 }
488 }
489
490 #undef BEFORE_EXIT_NOT_RUN
491 #undef BEFORE_EXIT_RUNNING
492 #undef BEFORE_EXIT_DONE
493 }
494
495 void vm_exit(int code) {
496 Thread* thread = ThreadLocalStorage::is_initialized() ?
497 ThreadLocalStorage::get_thread_slow() : NULL;
498 if (thread == NULL) {
499 // we have serious problems -- just exit
500 vm_direct_exit(code);
501 }
502
503 if (VMThread::vm_thread() != NULL) {
504 // Fire off a VM_Exit operation to bring VM to a safepoint and exit
505 VM_Exit op(code);
506 if (thread->is_Java_thread())
507 ((JavaThread*)thread)->set_thread_state(_thread_in_vm);
508 VMThread::execute(&op);
509 // should never reach here; but in case something wrong with VM Thread.
510 vm_direct_exit(code);
511 } else {
512 // VM thread is gone, just exit
513 vm_direct_exit(code);
514 }
515 ShouldNotReachHere();
516 }
517
518 void notify_vm_shutdown() {
519 // For now, just a dtrace probe.
520 HOTSPOT_VM_SHUTDOWN();
521 HS_DTRACE_WORKAROUND_TAIL_CALL_BUG();
522 }
523
524 void vm_direct_exit(int code) {
525 notify_vm_shutdown();
526 os::wait_for_keypress_at_exit();
527 os::exit(code);
528 }
529
530 void vm_perform_shutdown_actions() {
531 // Warning: do not call 'exit_globals()' here. All threads are still running.
532 // Calling 'exit_globals()' will disable thread-local-storage and cause all
533 // kinds of assertions to trigger in debug mode.
534 if (is_init_completed()) {
535 Thread* thread = ThreadLocalStorage::is_initialized() ?
536 ThreadLocalStorage::get_thread_slow() : NULL;
537 if (thread != NULL && thread->is_Java_thread()) {
538 // We are leaving the VM, set state to native (in case any OS exit
539 // handlers call back to the VM)
540 JavaThread* jt = (JavaThread*)thread;
541 // Must always be walkable or have no last_Java_frame when in
542 // thread_in_native
543 jt->frame_anchor()->make_walkable(jt);
544 jt->set_thread_state(_thread_in_native);
545 }
546 }
547 notify_vm_shutdown();
548 }
549
550 void vm_shutdown()
551 {
552 vm_perform_shutdown_actions();
553 os::wait_for_keypress_at_exit();
554 os::shutdown();
555 }
556
557 void vm_abort(bool dump_core) {
558 vm_perform_shutdown_actions();
559 os::wait_for_keypress_at_exit();
560 os::abort(dump_core);
561 ShouldNotReachHere();
562 }
563
564 void vm_notify_during_shutdown(const char* error, const char* message) {
565 if (error != NULL) {
566 tty->print_cr("Error occurred during initialization of VM");
567 tty->print("%s", error);
568 if (message != NULL) {
569 tty->print_cr(": %s", message);
570 }
571 else {
572 tty->cr();
573 }
574 }
575 if (ShowMessageBoxOnError && WizardMode) {
576 fatal("Error occurred during initialization of VM");
577 }
578 }
579
580 void vm_exit_during_initialization(Handle exception) {
581 tty->print_cr("Error occurred during initialization of VM");
582 // If there are exceptions on this thread it must be cleared
583 // first and here. Any future calls to EXCEPTION_MARK requires
584 // that no pending exceptions exist.
585 Thread *THREAD = Thread::current();
586 if (HAS_PENDING_EXCEPTION) {
587 CLEAR_PENDING_EXCEPTION;
588 }
589 java_lang_Throwable::print(exception, tty);
590 tty->cr();
591 java_lang_Throwable::print_stack_trace(exception(), tty);
592 tty->cr();
593 vm_notify_during_shutdown(NULL, NULL);
594
595 // Failure during initialization, we don't want to dump core
596 vm_abort(false);
597 }
598
599 void vm_exit_during_initialization(Symbol* ex, const char* message) {
600 ResourceMark rm;
601 vm_notify_during_shutdown(ex->as_C_string(), message);
602
603 // Failure during initialization, we don't want to dump core
604 vm_abort(false);
605 }
606
607 void vm_exit_during_initialization(const char* error, const char* message) {
608 vm_notify_during_shutdown(error, message);
609
610 // Failure during initialization, we don't want to dump core
611 vm_abort(false);
612 }
613
614 void vm_shutdown_during_initialization(const char* error, const char* message) {
615 vm_notify_during_shutdown(error, message);
616 vm_shutdown();
617 }
618
619 JDK_Version JDK_Version::_current;
620 const char* JDK_Version::_runtime_name;
621 const char* JDK_Version::_runtime_version;
622
623 void JDK_Version::initialize() {
624 jdk_version_info info;
625 assert(!_current.is_valid(), "Don't initialize twice");
626
627 void *lib_handle = os::native_java_library();
628 jdk_version_info_fn_t func = CAST_TO_FN_PTR(jdk_version_info_fn_t,
629 os::dll_lookup(lib_handle, "JDK_GetVersionInfo0"));
630
631 if (func == NULL) {
632 // JDK older than 1.6
633 _current._partially_initialized = true;
634 } else {
635 (*func)(&info, sizeof(info));
636
637 int major = JDK_VERSION_MAJOR(info.jdk_version);
638 int minor = JDK_VERSION_MINOR(info.jdk_version);
639 int micro = JDK_VERSION_MICRO(info.jdk_version);
640 int build = JDK_VERSION_BUILD(info.jdk_version);
641 if (major == 1 && minor > 4) {
642 // We represent "1.5.0" as "5.0", but 1.4.2 as itself.
643 major = minor;
644 minor = micro;
645 micro = 0;
646 }
647 // Incompatible with pre-4243978 JDK.
648 if (info.pending_list_uses_discovered_field == 0) {
649 vm_exit_during_initialization(
650 "Incompatible JDK is not using Reference.discovered field for pending list");
651 }
652 _current = JDK_Version(major, minor, micro, info.update_version,
653 info.special_update_version, build,
654 info.thread_park_blocker == 1,
655 info.post_vm_init_hook_enabled == 1);
656 }
657 }
658
659 void JDK_Version::fully_initialize(
660 uint8_t major, uint8_t minor, uint8_t micro, uint8_t update) {
661 // This is only called when current is less than 1.6 and we've gotten
662 // far enough in the initialization to determine the exact version.
663 assert(major < 6, "not needed for JDK version >= 6");
664 assert(is_partially_initialized(), "must not initialize");
665 if (major < 5) {
666 // JDK verison sequence: 1.2.x, 1.3.x, 1.4.x, 5.0.x, 6.0.x, etc.
667 micro = minor;
668 minor = major;
669 major = 1;
670 }
671 _current = JDK_Version(major, minor, micro, update);
672 }
673
674 void JDK_Version_init() {
675 JDK_Version::initialize();
676 }
677
678 static int64_t encode_jdk_version(const JDK_Version& v) {
679 return
680 ((int64_t)v.major_version() << (BitsPerByte * 5)) |
681 ((int64_t)v.minor_version() << (BitsPerByte * 4)) |
682 ((int64_t)v.micro_version() << (BitsPerByte * 3)) |
683 ((int64_t)v.update_version() << (BitsPerByte * 2)) |
684 ((int64_t)v.special_update_version() << (BitsPerByte * 1)) |
685 ((int64_t)v.build_number() << (BitsPerByte * 0));
686 }
687
688 int JDK_Version::compare(const JDK_Version& other) const {
689 assert(is_valid() && other.is_valid(), "Invalid version (uninitialized?)");
690 if (!is_partially_initialized() && other.is_partially_initialized()) {
691 return -(other.compare(*this)); // flip the comparators
692 }
693 assert(!other.is_partially_initialized(), "Not initialized yet");
694 if (is_partially_initialized()) {
695 assert(other.major_version() >= 6,
696 "Invalid JDK version comparison during initialization");
697 return -1;
698 } else {
699 uint64_t e = encode_jdk_version(*this);
700 uint64_t o = encode_jdk_version(other);
701 return (e > o) ? 1 : ((e == o) ? 0 : -1);
702 }
703 }
704
705 void JDK_Version::to_string(char* buffer, size_t buflen) const {
706 assert(buffer && buflen > 0, "call with useful buffer");
707 size_t index = 0;
708
709 if (!is_valid()) {
710 jio_snprintf(buffer, buflen, "%s", "(uninitialized)");
711 } else if (is_partially_initialized()) {
712 jio_snprintf(buffer, buflen, "%s", "(uninitialized) pre-1.6.0");
713 } else {
714 int rc = jio_snprintf(
715 &buffer[index], buflen - index, "%d.%d", _major, _minor);
716 if (rc == -1) return;
717 index += rc;
718 if (_micro > 0) {
719 rc = jio_snprintf(&buffer[index], buflen - index, ".%d", _micro);
720 }
721 if (_update > 0) {
722 rc = jio_snprintf(&buffer[index], buflen - index, "_%02d", _update);
723 if (rc == -1) return;
724 index += rc;
725 }
726 if (_special > 0) {
727 rc = jio_snprintf(&buffer[index], buflen - index, "%c", _special);
728 if (rc == -1) return;
729 index += rc;
730 }
731 if (_build > 0) {
732 rc = jio_snprintf(&buffer[index], buflen - index, "-b%02d", _build);
733 if (rc == -1) return;
734 index += rc;
735 }
736 }
737 }