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 "interpreter/bytecodeHistogram.hpp"
33 #include "memory/genCollectedHeap.hpp"
34 #include "memory/oopFactory.hpp"
35 #include "memory/universe.hpp"
36 #include "oops/constantPool.hpp"
37 #include "oops/generateOopMap.hpp"
38 #include "oops/instanceKlass.hpp"
39 #include "oops/instanceOop.hpp"
40 #include "oops/method.hpp"
41 #include "oops/objArrayOop.hpp"
42 #include "oops/oop.inline.hpp"
43 #include "oops/symbol.hpp"
44 #include "prims/jvmtiExport.hpp"
45 #include "runtime/arguments.hpp"
46 #include "runtime/biasedLocking.hpp"
47 #include "runtime/compilationPolicy.hpp"
48 #include "runtime/fprofiler.hpp"
49 #include "runtime/init.hpp"
50 #include "runtime/interfaceSupport.hpp"
51 #include "runtime/java.hpp"
52 #include "runtime/memprofiler.hpp"
53 #include "runtime/sharedRuntime.hpp"
54 #include "runtime/statSampler.hpp"
55 #include "runtime/sweeper.hpp"
56 #include "runtime/task.hpp"
57 #include "runtime/thread.inline.hpp"
58 #include "runtime/timer.hpp"
59 #include "runtime/vm_operations.hpp"
60 #include "services/memTracker.hpp"
61 #include "trace/tracing.hpp"
62 #include "utilities/dtrace.hpp"
63 #include "utilities/globalDefinitions.hpp"
64 #include "utilities/histogram.hpp"
65 #include "utilities/macros.hpp"
66 #include "utilities/vmError.hpp"
67 #if INCLUDE_ALL_GCS
68 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp"
69 #include "gc_implementation/parallelScavenge/psScavenge.hpp"
70 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp"
71 #endif // INCLUDE_ALL_GCS
72 #ifdef COMPILER1
73 #include "c1/c1_Compiler.hpp"
74 #include "c1/c1_Runtime1.hpp"
75 #endif
76 #ifdef COMPILER2
77 #include "code/compiledIC.hpp"
78 #include "compiler/methodLiveness.hpp"
79 #include "opto/compile.hpp"
80 #include "opto/indexSet.hpp"
81 #include "opto/runtime.hpp"
82 #endif
83
84 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
85
86 GrowableArray<Method*>* collected_profiled_methods;
87
88 int compare_methods(Method** a, Method** b) {
89 // %%% there can be 32-bit overflow here
90 return ((*b)->invocation_count() + (*b)->compiled_invocation_count())
91 - ((*a)->invocation_count() + (*a)->compiled_invocation_count());
92 }
93
94 void collect_profiled_methods(Method* m) {
95 Thread* thread = Thread::current();
96 // This HandleMark prevents a huge amount of handles from being added
97 // to the metadata_handles() array on the thread.
98 HandleMark hm(thread);
99 methodHandle mh(thread, m);
100 if ((m->method_data() != NULL) &&
101 (PrintMethodData || CompilerOracle::should_print(mh))) {
102 collected_profiled_methods->push(m);
103 }
104 }
105
106 void print_method_profiling_data() {
107 if (ProfileInterpreter COMPILER1_PRESENT(|| C1UpdateMethodData) &&
108 (PrintMethodData || CompilerOracle::should_print_methods())) {
109 ResourceMark rm;
110 HandleMark hm;
111 collected_profiled_methods = new GrowableArray<Method*>(1024);
112 ClassLoaderDataGraph::methods_do(collect_profiled_methods);
113 collected_profiled_methods->sort(&compare_methods);
114
115 int count = collected_profiled_methods->length();
116 int total_size = 0;
117 if (count > 0) {
118 for (int index = 0; index < count; index++) {
119 Method* m = collected_profiled_methods->at(index);
120 ttyLocker ttyl;
121 tty->print_cr("------------------------------------------------------------------------");
122 m->print_invocation_count();
123 tty->print_cr(" mdo size: %d bytes", m->method_data()->size_in_bytes());
124 tty->cr();
125 // Dump data on parameters if any
126 if (m->method_data() != NULL && m->method_data()->parameters_type_data() != NULL) {
127 tty->fill_to(2);
128 m->method_data()->parameters_type_data()->print_data_on(tty);
129 }
130 m->print_codes();
131 total_size += m->method_data()->size_in_bytes();
132 }
133 tty->print_cr("------------------------------------------------------------------------");
134 tty->print_cr("Total MDO size: %d bytes", total_size);
135 }
136 }
137 }
138
139
140 #ifndef PRODUCT
141
142 // Statistics printing (method invocation histogram)
143
144 GrowableArray<Method*>* collected_invoked_methods;
145
146 void collect_invoked_methods(Method* m) {
147 if (m->invocation_count() + m->compiled_invocation_count() >= 1 ) {
148 collected_invoked_methods->push(m);
149 }
150 }
151
152
153
154
155 void print_method_invocation_histogram() {
156 ResourceMark rm;
157 HandleMark hm;
158 collected_invoked_methods = new GrowableArray<Method*>(1024);
159 SystemDictionary::methods_do(collect_invoked_methods);
160 collected_invoked_methods->sort(&compare_methods);
161 //
162 tty->cr();
163 tty->print_cr("Histogram Over MethodOop Invocation Counters (cutoff = %d):", MethodHistogramCutoff);
164 tty->cr();
165 tty->print_cr("____Count_(I+C)____Method________________________Module_________________");
166 unsigned total = 0, int_total = 0, comp_total = 0, static_total = 0, final_total = 0,
167 synch_total = 0, nativ_total = 0, acces_total = 0;
168 for (int index = 0; index < collected_invoked_methods->length(); index++) {
169 Method* m = collected_invoked_methods->at(index);
170 int c = m->invocation_count() + m->compiled_invocation_count();
171 if (c >= MethodHistogramCutoff) m->print_invocation_count();
172 int_total += m->invocation_count();
173 comp_total += m->compiled_invocation_count();
174 if (m->is_final()) final_total += c;
175 if (m->is_static()) static_total += c;
176 if (m->is_synchronized()) synch_total += c;
177 if (m->is_native()) nativ_total += c;
178 if (m->is_accessor()) acces_total += c;
179 }
180 tty->cr();
181 total = int_total + comp_total;
182 tty->print_cr("Invocations summary:");
183 tty->print_cr("\t%9d (%4.1f%%) interpreted", int_total, 100.0 * int_total / total);
184 tty->print_cr("\t%9d (%4.1f%%) compiled", comp_total, 100.0 * comp_total / total);
185 tty->print_cr("\t%9d (100%%) total", total);
186 tty->print_cr("\t%9d (%4.1f%%) synchronized", synch_total, 100.0 * synch_total / total);
187 tty->print_cr("\t%9d (%4.1f%%) final", final_total, 100.0 * final_total / total);
188 tty->print_cr("\t%9d (%4.1f%%) static", static_total, 100.0 * static_total / total);
189 tty->print_cr("\t%9d (%4.1f%%) native", nativ_total, 100.0 * nativ_total / total);
190 tty->print_cr("\t%9d (%4.1f%%) accessor", acces_total, 100.0 * acces_total / total);
191 tty->cr();
192 SharedRuntime::print_call_statistics(comp_total);
193 }
194
195 void print_bytecode_count() {
196 if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
197 tty->print_cr("[BytecodeCounter::counter_value = %d]", BytecodeCounter::counter_value());
198 }
199 }
200
201 AllocStats alloc_stats;
202
203
204
205 // General statistics printing (profiling ...)
206 void print_statistics() {
207 #ifdef ASSERT
208
209 if (CountRuntimeCalls) {
210 extern Histogram *RuntimeHistogram;
211 RuntimeHistogram->print();
212 }
213
214 if (CountJNICalls) {
215 extern Histogram *JNIHistogram;
216 JNIHistogram->print();
217 }
218
219 if (CountJVMCalls) {
220 extern Histogram *JVMHistogram;
221 JVMHistogram->print();
222 }
223
224 #endif
225
226 if (MemProfiling) {
227 MemProfiler::disengage();
228 }
229
230 if (CITime) {
231 CompileBroker::print_times();
232 }
233
234 #ifdef COMPILER1
235 if ((PrintC1Statistics || LogVMOutput || LogCompilation) && UseCompiler) {
236 FlagSetting fs(DisplayVMOutput, DisplayVMOutput && PrintC1Statistics);
237 Runtime1::print_statistics();
238 Deoptimization::print_statistics();
239 SharedRuntime::print_statistics();
240 nmethod::print_statistics();
241 }
242 #endif /* COMPILER1 */
243
244 #ifdef COMPILER2
245 if ((PrintOptoStatistics || LogVMOutput || LogCompilation) && UseCompiler) {
246 FlagSetting fs(DisplayVMOutput, DisplayVMOutput && PrintOptoStatistics);
247 Compile::print_statistics();
248 #ifndef COMPILER1
249 Deoptimization::print_statistics();
250 nmethod::print_statistics();
251 SharedRuntime::print_statistics();
252 #endif //COMPILER1
253 os::print_statistics();
254 }
255
256 if (PrintLockStatistics || PrintPreciseBiasedLockingStatistics || PrintPreciseRTMLockingStatistics) {
257 OptoRuntime::print_named_counters();
258 }
259
260 if (TimeLivenessAnalysis) {
261 MethodLiveness::print_times();
262 }
263 #ifdef ASSERT
264 if (CollectIndexSetStatistics) {
265 IndexSet::print_statistics();
266 }
267 #endif // ASSERT
268 #endif // COMPILER2
269 if (CountCompiledCalls) {
270 print_method_invocation_histogram();
271 }
272
273 print_method_profiling_data();
274
275 if (TimeCompilationPolicy) {
276 CompilationPolicy::policy()->print_time();
277 }
278 if (TimeOopMap) {
279 GenerateOopMap::print_time();
280 }
281 if (ProfilerCheckIntervals) {
282 PeriodicTask::print_intervals();
283 }
284 if (PrintSymbolTableSizeHistogram) {
285 SymbolTable::print_histogram();
286 }
287 if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
288 BytecodeCounter::print();
289 }
290 if (PrintBytecodePairHistogram) {
291 BytecodePairHistogram::print();
292 }
293
294 if (PrintCodeCache) {
295 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
296 CodeCache::print();
297 }
298
299 if (PrintMethodFlushingStatistics) {
300 NMethodSweeper::print();
301 }
302
303 if (PrintCodeCache2) {
304 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
305 CodeCache::print_internals();
306 }
307
308 if (PrintClassStatistics) {
309 SystemDictionary::print_class_statistics();
310 }
311 if (PrintMethodStatistics) {
312 SystemDictionary::print_method_statistics();
313 }
314
315 if (PrintVtableStats) {
316 klassVtable::print_statistics();
317 klassItable::print_statistics();
318 }
319 if (VerifyOops) {
320 tty->print_cr("+VerifyOops count: %d", StubRoutines::verify_oop_count());
321 }
322
323 print_bytecode_count();
324 if (PrintMallocStatistics) {
325 tty->print("allocation stats: ");
326 alloc_stats.print();
327 tty->cr();
328 }
329
330 if (PrintSystemDictionaryAtExit) {
331 SystemDictionary::print();
332 }
333
334 if (PrintBiasedLockingStatistics) {
335 BiasedLocking::print_counters();
336 }
337
338 #ifdef ENABLE_ZAP_DEAD_LOCALS
339 #ifdef COMPILER2
340 if (ZapDeadCompiledLocals) {
341 tty->print_cr("Compile::CompiledZap_count = %d", Compile::CompiledZap_count);
342 tty->print_cr("OptoRuntime::ZapDeadCompiledLocals_count = %d", OptoRuntime::ZapDeadCompiledLocals_count);
343 }
344 #endif // COMPILER2
345 #endif // ENABLE_ZAP_DEAD_LOCALS
346 // Native memory tracking data
347 if (PrintNMTStatistics) {
348 MemTracker::final_report(tty);
349 }
350 }
351
352 #else // PRODUCT MODE STATISTICS
353
354 void print_statistics() {
355
356 if (PrintMethodData) {
357 print_method_profiling_data();
358 }
359
360 if (CITime) {
361 CompileBroker::print_times();
362 }
363
364 if (PrintCodeCache) {
365 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
366 CodeCache::print();
367 }
368
369 if (PrintMethodFlushingStatistics) {
370 NMethodSweeper::print();
371 }
372
373 #ifdef COMPILER2
374 if (PrintPreciseBiasedLockingStatistics || PrintPreciseRTMLockingStatistics) {
375 OptoRuntime::print_named_counters();
376 }
377 #endif
378 if (PrintBiasedLockingStatistics) {
379 BiasedLocking::print_counters();
380 }
381
382 // Native memory tracking data
383 if (PrintNMTStatistics) {
384 MemTracker::final_report(tty);
385 }
386 }
387
388 #endif
389
390 // Note: before_exit() can be executed only once, if more than one threads
391 // are trying to shutdown the VM at the same time, only one thread
392 // can run before_exit() and all other threads must wait.
393 void before_exit(JavaThread * thread) {
394 #define BEFORE_EXIT_NOT_RUN 0
395 #define BEFORE_EXIT_RUNNING 1
396 #define BEFORE_EXIT_DONE 2
397 static jint volatile _before_exit_status = BEFORE_EXIT_NOT_RUN;
398
399 // Note: don't use a Mutex to guard the entire before_exit(), as
400 // JVMTI post_thread_end_event and post_vm_death_event will run native code.
401 // A CAS or OSMutex would work just fine but then we need to manipulate
402 // thread state for Safepoint. Here we use Monitor wait() and notify_all()
403 // for synchronization.
404 { MutexLocker ml(BeforeExit_lock);
405 switch (_before_exit_status) {
406 case BEFORE_EXIT_NOT_RUN:
407 _before_exit_status = BEFORE_EXIT_RUNNING;
408 break;
409 case BEFORE_EXIT_RUNNING:
410 while (_before_exit_status == BEFORE_EXIT_RUNNING) {
411 BeforeExit_lock->wait();
412 }
413 assert(_before_exit_status == BEFORE_EXIT_DONE, "invalid state");
414 return;
415 case BEFORE_EXIT_DONE:
416 return;
417 }
418 }
419
420 // Hang forever on exit if we're reporting an error.
421 if (ShowMessageBoxOnError && is_error_reported()) {
422 os::infinite_sleep();
423 }
424
425 // Stop the WatcherThread. We do this before disenrolling various
426 // PeriodicTasks to reduce the likelyhood of races.
427 if (PeriodicTask::num_tasks() > 0) {
428 WatcherThread::stop();
429 }
430
431 // Print statistics gathered (profiling ...)
432 if (Arguments::has_profile()) {
433 FlatProfiler::disengage();
434 FlatProfiler::print(10);
435 }
436
437 // shut down the StatSampler task
438 StatSampler::disengage();
439 StatSampler::destroy();
440
441 // Stop concurrent GC threads
442 Universe::heap()->stop();
443
444 // Print GC/heap related information.
445 if (PrintGCDetails) {
446 Universe::print();
447 AdaptiveSizePolicyOutput(0);
448 if (Verbose) {
449 ClassLoaderDataGraph::dump_on(gclog_or_tty);
450 }
451 }
452
453 if (PrintBytecodeHistogram) {
454 BytecodeHistogram::print();
455 }
456
457 if (JvmtiExport::should_post_thread_life()) {
458 JvmtiExport::post_thread_end(thread);
459 }
460
461
462 EventThreadEnd event;
463 if (event.should_commit()) {
464 event.set_javalangthread(java_lang_Thread::thread_id(thread->threadObj()));
465 event.commit();
466 }
467
468 // Always call even when there are not JVMTI environments yet, since environments
469 // may be attached late and JVMTI must track phases of VM execution
470 JvmtiExport::post_vm_death();
471 Threads::shutdown_vm_agents();
472
473 // Terminate the signal thread
474 // Note: we don't wait until it actually dies.
475 os::terminate_signal_thread();
476
477 print_statistics();
478 Universe::heap()->print_tracing_info();
479
480 { MutexLocker ml(BeforeExit_lock);
481 _before_exit_status = BEFORE_EXIT_DONE;
482 BeforeExit_lock->notify_all();
483 }
484
485 if (VerifyStringTableAtExit) {
486 int fail_cnt = 0;
487 {
488 MutexLocker ml(StringTable_lock);
489 fail_cnt = StringTable::verify_and_compare_entries();
490 }
491
492 if (fail_cnt != 0) {
493 tty->print_cr("ERROR: fail_cnt=%d", fail_cnt);
494 guarantee(fail_cnt == 0, "unexpected StringTable verification failures");
495 }
496 }
497
498 #undef BEFORE_EXIT_NOT_RUN
499 #undef BEFORE_EXIT_RUNNING
500 #undef BEFORE_EXIT_DONE
501 }
502
503 void vm_exit(int code) {
504 Thread* thread = ThreadLocalStorage::is_initialized() ?
505 ThreadLocalStorage::get_thread_slow() : NULL;
506 if (thread == NULL) {
507 // we have serious problems -- just exit
508 vm_direct_exit(code);
509 }
510
511 if (VMThread::vm_thread() != NULL) {
512 // Fire off a VM_Exit operation to bring VM to a safepoint and exit
513 VM_Exit op(code);
514 if (thread->is_Java_thread())
515 ((JavaThread*)thread)->set_thread_state(_thread_in_vm);
516 VMThread::execute(&op);
517 // should never reach here; but in case something wrong with VM Thread.
518 vm_direct_exit(code);
519 } else {
520 // VM thread is gone, just exit
521 vm_direct_exit(code);
522 }
523 ShouldNotReachHere();
524 }
525
526 void notify_vm_shutdown() {
527 // For now, just a dtrace probe.
528 HOTSPOT_VM_SHUTDOWN();
529 HS_DTRACE_WORKAROUND_TAIL_CALL_BUG();
530 }
531
532 void vm_direct_exit(int code) {
533 notify_vm_shutdown();
534 os::wait_for_keypress_at_exit();
535 os::exit(code);
536 }
537
538 void vm_perform_shutdown_actions() {
539 // Warning: do not call 'exit_globals()' here. All threads are still running.
540 // Calling 'exit_globals()' will disable thread-local-storage and cause all
541 // kinds of assertions to trigger in debug mode.
542 if (is_init_completed()) {
543 Thread* thread = ThreadLocalStorage::is_initialized() ?
544 ThreadLocalStorage::get_thread_slow() : NULL;
545 if (thread != NULL && thread->is_Java_thread()) {
546 // We are leaving the VM, set state to native (in case any OS exit
547 // handlers call back to the VM)
548 JavaThread* jt = (JavaThread*)thread;
549 // Must always be walkable or have no last_Java_frame when in
550 // thread_in_native
551 jt->frame_anchor()->make_walkable(jt);
552 jt->set_thread_state(_thread_in_native);
553 }
554 }
555 notify_vm_shutdown();
556 }
557
558 void vm_shutdown()
559 {
560 vm_perform_shutdown_actions();
561 os::wait_for_keypress_at_exit();
562 os::shutdown();
563 }
564
565 void vm_abort(bool dump_core) {
566 vm_perform_shutdown_actions();
567 os::wait_for_keypress_at_exit();
568 os::abort(dump_core);
569 ShouldNotReachHere();
570 }
571
572 void vm_notify_during_shutdown(const char* error, const char* message) {
573 if (error != NULL) {
574 tty->print_cr("Error occurred during initialization of VM");
575 tty->print("%s", error);
576 if (message != NULL) {
577 tty->print_cr(": %s", message);
578 }
579 else {
580 tty->cr();
581 }
582 }
583 if (ShowMessageBoxOnError && WizardMode) {
584 fatal("Error occurred during initialization of VM");
585 }
586 }
587
588 void vm_exit_during_initialization(Handle exception) {
589 tty->print_cr("Error occurred during initialization of VM");
590 // If there are exceptions on this thread it must be cleared
591 // first and here. Any future calls to EXCEPTION_MARK requires
592 // that no pending exceptions exist.
593 Thread *THREAD = Thread::current();
594 if (HAS_PENDING_EXCEPTION) {
595 CLEAR_PENDING_EXCEPTION;
596 }
597 java_lang_Throwable::print(exception, tty);
598 tty->cr();
599 java_lang_Throwable::print_stack_trace(exception(), tty);
600 tty->cr();
601 vm_notify_during_shutdown(NULL, NULL);
602
603 // Failure during initialization, we don't want to dump core
604 vm_abort(false);
605 }
606
607 void vm_exit_during_initialization(Symbol* ex, const char* message) {
608 ResourceMark rm;
609 vm_notify_during_shutdown(ex->as_C_string(), message);
610
611 // Failure during initialization, we don't want to dump core
612 vm_abort(false);
613 }
614
615 void vm_exit_during_initialization(const char* error, const char* message) {
616 vm_notify_during_shutdown(error, message);
617
618 // Failure during initialization, we don't want to dump core
619 vm_abort(false);
620 }
621
622 void vm_shutdown_during_initialization(const char* error, const char* message) {
623 vm_notify_during_shutdown(error, message);
624 vm_shutdown();
625 }
626
627 JDK_Version JDK_Version::_current;
628 const char* JDK_Version::_runtime_name;
629 const char* JDK_Version::_runtime_version;
630
631 void JDK_Version::initialize() {
632 jdk_version_info info;
633 assert(!_current.is_valid(), "Don't initialize twice");
634
635 void *lib_handle = os::native_java_library();
636 jdk_version_info_fn_t func = CAST_TO_FN_PTR(jdk_version_info_fn_t,
637 os::dll_lookup(lib_handle, "JDK_GetVersionInfo0"));
638
639 if (func == NULL) {
640 // JDK older than 1.6
641 _current._partially_initialized = true;
642 } else {
643 (*func)(&info, sizeof(info));
644
645 int major = JDK_VERSION_MAJOR(info.jdk_version);
646 int minor = JDK_VERSION_MINOR(info.jdk_version);
647 int micro = JDK_VERSION_MICRO(info.jdk_version);
648 int build = JDK_VERSION_BUILD(info.jdk_version);
649 if (major == 1 && minor > 4) {
650 // We represent "1.5.0" as "5.0", but 1.4.2 as itself.
651 major = minor;
652 minor = micro;
653 micro = 0;
654 }
655 _current = JDK_Version(major, minor, micro, info.update_version,
656 info.special_update_version, build,
657 info.thread_park_blocker == 1,
658 info.post_vm_init_hook_enabled == 1,
659 info.pending_list_uses_discovered_field == 1);
660 }
661 }
662
663 void JDK_Version::fully_initialize(
664 uint8_t major, uint8_t minor, uint8_t micro, uint8_t update) {
665 // This is only called when current is less than 1.6 and we've gotten
666 // far enough in the initialization to determine the exact version.
667 assert(major < 6, "not needed for JDK version >= 6");
668 assert(is_partially_initialized(), "must not initialize");
669 if (major < 5) {
670 // JDK verison sequence: 1.2.x, 1.3.x, 1.4.x, 5.0.x, 6.0.x, etc.
671 micro = minor;
672 minor = major;
673 major = 1;
674 }
675 _current = JDK_Version(major, minor, micro, update);
676 }
677
678 void JDK_Version_init() {
679 JDK_Version::initialize();
680 }
681
682 static int64_t encode_jdk_version(const JDK_Version& v) {
683 return
684 ((int64_t)v.major_version() << (BitsPerByte * 5)) |
685 ((int64_t)v.minor_version() << (BitsPerByte * 4)) |
686 ((int64_t)v.micro_version() << (BitsPerByte * 3)) |
687 ((int64_t)v.update_version() << (BitsPerByte * 2)) |
688 ((int64_t)v.special_update_version() << (BitsPerByte * 1)) |
689 ((int64_t)v.build_number() << (BitsPerByte * 0));
690 }
691
692 int JDK_Version::compare(const JDK_Version& other) const {
693 assert(is_valid() && other.is_valid(), "Invalid version (uninitialized?)");
694 if (!is_partially_initialized() && other.is_partially_initialized()) {
695 return -(other.compare(*this)); // flip the comparators
696 }
697 assert(!other.is_partially_initialized(), "Not initialized yet");
698 if (is_partially_initialized()) {
699 assert(other.major_version() >= 6,
700 "Invalid JDK version comparison during initialization");
701 return -1;
702 } else {
703 uint64_t e = encode_jdk_version(*this);
704 uint64_t o = encode_jdk_version(other);
705 return (e > o) ? 1 : ((e == o) ? 0 : -1);
706 }
707 }
708
709 void JDK_Version::to_string(char* buffer, size_t buflen) const {
710 assert(buffer && buflen > 0, "call with useful buffer");
711 size_t index = 0;
712
713 if (!is_valid()) {
714 jio_snprintf(buffer, buflen, "%s", "(uninitialized)");
715 } else if (is_partially_initialized()) {
716 jio_snprintf(buffer, buflen, "%s", "(uninitialized) pre-1.6.0");
717 } else {
718 int rc = jio_snprintf(
719 &buffer[index], buflen - index, "%d.%d", _major, _minor);
720 if (rc == -1) return;
721 index += rc;
722 if (_micro > 0) {
723 rc = jio_snprintf(&buffer[index], buflen - index, ".%d", _micro);
724 }
725 if (_update > 0) {
726 rc = jio_snprintf(&buffer[index], buflen - index, "_%02d", _update);
727 if (rc == -1) return;
728 index += rc;
729 }
730 if (_special > 0) {
731 rc = jio_snprintf(&buffer[index], buflen - index, "%c", _special);
732 if (rc == -1) return;
733 index += rc;
734 }
735 if (_build > 0) {
736 rc = jio_snprintf(&buffer[index], buflen - index, "-b%02d", _build);
737 if (rc == -1) return;
738 index += rc;
739 }
740 }
741 }