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 #if INCLUDE_JVMCI
35 #include "jvmci/jvmciCompiler.hpp"
36 #include "jvmci/jvmciRuntime.hpp"
37 #endif
38 #include "memory/oopFactory.hpp"
39 #include "memory/universe.hpp"
40 #include "oops/constantPool.hpp"
41 #include "oops/generateOopMap.hpp"
42 #include "oops/instanceKlass.hpp"
43 #include "oops/instanceOop.hpp"
44 #include "oops/method.hpp"
45 #include "oops/objArrayOop.hpp"
46 #include "oops/oop.inline.hpp"
47 #include "oops/symbol.hpp"
48 #include "prims/jvmtiExport.hpp"
49 #include "runtime/arguments.hpp"
50 #include "runtime/biasedLocking.hpp"
51 #include "runtime/compilationPolicy.hpp"
52 #include "runtime/fprofiler.hpp"
53 #include "runtime/init.hpp"
54 #include "runtime/interfaceSupport.hpp"
55 #include "runtime/java.hpp"
56 #include "runtime/memprofiler.hpp"
57 #include "runtime/sharedRuntime.hpp"
58 #include "runtime/statSampler.hpp"
59 #include "runtime/sweeper.hpp"
60 #include "runtime/task.hpp"
61 #include "runtime/thread.inline.hpp"
62 #include "runtime/timer.hpp"
63 #include "runtime/vm_operations.hpp"
64 #include "services/memTracker.hpp"
65 #include "trace/tracing.hpp"
66 #include "utilities/dtrace.hpp"
67 #include "utilities/globalDefinitions.hpp"
68 #include "utilities/histogram.hpp"
69 #include "utilities/macros.hpp"
70 #include "utilities/vmError.hpp"
71 #if INCLUDE_ALL_GCS
72 #include "gc/cms/concurrentMarkSweepThread.hpp"
73 #include "gc/parallel/psScavenge.hpp"
74 #endif // INCLUDE_ALL_GCS
75 #ifdef COMPILER1
76 #include "c1/c1_Compiler.hpp"
77 #include "c1/c1_Runtime1.hpp"
78 #endif
79 #ifdef COMPILER2
80 #include "code/compiledIC.hpp"
81 #include "compiler/methodLiveness.hpp"
82 #include "opto/compile.hpp"
83 #include "opto/indexSet.hpp"
84 #include "opto/runtime.hpp"
85 #endif
86
87 GrowableArray<Method*>* collected_profiled_methods;
88
89 int compare_methods(Method** a, Method** b) {
90 // %%% there can be 32-bit overflow here
91 return ((*b)->invocation_count() + (*b)->compiled_invocation_count())
92 - ((*a)->invocation_count() + (*a)->compiled_invocation_count());
93 }
94
95 void collect_profiled_methods(Method* m) {
96 Thread* thread = Thread::current();
97 // This HandleMark prevents a huge amount of handles from being added
98 // to the metadata_handles() array on the thread.
99 HandleMark hm(thread);
100 methodHandle mh(thread, m);
101 if ((m->method_data() != NULL) &&
102 (PrintMethodData || CompilerOracle::should_print(mh))) {
103 collected_profiled_methods->push(m);
104 }
105 }
106
107 void print_method_profiling_data() {
108 if (ProfileInterpreter COMPILER1_PRESENT(|| C1UpdateMethodData) &&
109 (PrintMethodData || CompilerOracle::should_print_methods())) {
110 ResourceMark rm;
111 HandleMark hm;
112 collected_profiled_methods = new GrowableArray<Method*>(1024);
113 ClassLoaderDataGraph::methods_do(collect_profiled_methods);
114 collected_profiled_methods->sort(&compare_methods);
115
116 int count = collected_profiled_methods->length();
117 int total_size = 0;
118 if (count > 0) {
119 for (int index = 0; index < count; index++) {
120 Method* m = collected_profiled_methods->at(index);
121 ttyLocker ttyl;
122 tty->print_cr("------------------------------------------------------------------------");
123 m->print_invocation_count();
124 tty->print_cr(" mdo size: %d bytes", m->method_data()->size_in_bytes());
125 tty->cr();
126 // Dump data on parameters if any
127 if (m->method_data() != NULL && m->method_data()->parameters_type_data() != NULL) {
128 tty->fill_to(2);
129 m->method_data()->parameters_type_data()->print_data_on(tty);
130 }
131 m->print_codes();
132 total_size += m->method_data()->size_in_bytes();
133 }
134 tty->print_cr("------------------------------------------------------------------------");
135 tty->print_cr("Total MDO size: %d bytes", total_size);
136 }
137 }
138 }
139
140
141 #ifndef PRODUCT
142
143 // Statistics printing (method invocation histogram)
144
145 GrowableArray<Method*>* collected_invoked_methods;
146
147 void collect_invoked_methods(Method* m) {
148 if (m->invocation_count() + m->compiled_invocation_count() >= 1 ) {
149 collected_invoked_methods->push(m);
150 }
151 }
152
153
154
155
156 void print_method_invocation_histogram() {
157 ResourceMark rm;
158 HandleMark hm;
159 collected_invoked_methods = new GrowableArray<Method*>(1024);
160 SystemDictionary::methods_do(collect_invoked_methods);
161 collected_invoked_methods->sort(&compare_methods);
162 //
163 tty->cr();
164 tty->print_cr("Histogram Over MethodOop Invocation Counters (cutoff = " INTX_FORMAT "):", MethodHistogramCutoff);
165 tty->cr();
166 tty->print_cr("____Count_(I+C)____Method________________________Module_________________");
167 unsigned total = 0, int_total = 0, comp_total = 0, static_total = 0, final_total = 0,
168 synch_total = 0, nativ_total = 0, acces_total = 0;
169 for (int index = 0; index < collected_invoked_methods->length(); index++) {
170 Method* m = collected_invoked_methods->at(index);
171 int c = m->invocation_count() + m->compiled_invocation_count();
172 if (c >= MethodHistogramCutoff) m->print_invocation_count();
173 int_total += m->invocation_count();
174 comp_total += m->compiled_invocation_count();
175 if (m->is_final()) final_total += c;
176 if (m->is_static()) static_total += c;
177 if (m->is_synchronized()) synch_total += c;
178 if (m->is_native()) nativ_total += c;
179 if (m->is_accessor()) acces_total += c;
180 }
181 tty->cr();
182 total = int_total + comp_total;
183 tty->print_cr("Invocations summary:");
184 tty->print_cr("\t%9d (%4.1f%%) interpreted", int_total, 100.0 * int_total / total);
185 tty->print_cr("\t%9d (%4.1f%%) compiled", comp_total, 100.0 * comp_total / total);
186 tty->print_cr("\t%9d (100%%) total", total);
187 tty->print_cr("\t%9d (%4.1f%%) synchronized", synch_total, 100.0 * synch_total / total);
188 tty->print_cr("\t%9d (%4.1f%%) final", final_total, 100.0 * final_total / total);
189 tty->print_cr("\t%9d (%4.1f%%) static", static_total, 100.0 * static_total / total);
190 tty->print_cr("\t%9d (%4.1f%%) native", nativ_total, 100.0 * nativ_total / total);
191 tty->print_cr("\t%9d (%4.1f%%) accessor", acces_total, 100.0 * acces_total / total);
192 tty->cr();
193 SharedRuntime::print_call_statistics(comp_total);
194 }
195
196 void print_bytecode_count() {
197 if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
198 tty->print_cr("[BytecodeCounter::counter_value = %d]", BytecodeCounter::counter_value());
199 }
200 }
201
202 AllocStats alloc_stats;
203
204
205
206 // General statistics printing (profiling ...)
207 void print_statistics() {
208 #ifdef ASSERT
209
210 if (CountRuntimeCalls) {
211 extern Histogram *RuntimeHistogram;
212 RuntimeHistogram->print();
213 }
214
215 if (CountJNICalls) {
216 extern Histogram *JNIHistogram;
217 JNIHistogram->print();
218 }
219
220 if (CountJVMCalls) {
221 extern Histogram *JVMHistogram;
222 JVMHistogram->print();
223 }
224
225 #endif
226
227 if (MemProfiling) {
228 MemProfiler::disengage();
229 }
230
231 if (CITime) {
232 CompileBroker::print_times();
233 }
234
235 #ifdef COMPILER1
236 if ((PrintC1Statistics || LogVMOutput || LogCompilation) && UseCompiler) {
237 FlagSetting fs(DisplayVMOutput, DisplayVMOutput && PrintC1Statistics);
238 Runtime1::print_statistics();
239 Deoptimization::print_statistics();
240 SharedRuntime::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 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 #else
268 #ifdef INCLUDE_JVMCI
269 #ifndef COMPILER1
270 if ((TraceDeoptimization || LogVMOutput || LogCompilation) && UseCompiler) {
271 FlagSetting fs(DisplayVMOutput, DisplayVMOutput && TraceDeoptimization);
272 Deoptimization::print_statistics();
273 SharedRuntime::print_statistics();
274 }
275 #endif
276 #endif
277 #endif
278
279 if (PrintNMethodStatistics) {
280 nmethod::print_statistics();
281 }
282 if (CountCompiledCalls) {
283 print_method_invocation_histogram();
284 }
285
286 print_method_profiling_data();
287
288 if (TimeCompilationPolicy) {
289 CompilationPolicy::policy()->print_time();
290 }
291 if (TimeOopMap) {
292 GenerateOopMap::print_time();
293 }
294 if (ProfilerCheckIntervals) {
295 PeriodicTask::print_intervals();
296 }
297 if (PrintSymbolTableSizeHistogram) {
298 SymbolTable::print_histogram();
299 }
300 if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
301 BytecodeCounter::print();
302 }
303 if (PrintBytecodePairHistogram) {
304 BytecodePairHistogram::print();
305 }
306
307 if (PrintCodeCache) {
308 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
309 CodeCache::print();
310 }
311
312 if (PrintMethodFlushingStatistics) {
313 NMethodSweeper::print();
314 }
315
316 if (PrintCodeCache2) {
317 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
318 CodeCache::print_internals();
319 }
320
321 if (PrintVtableStats) {
322 klassVtable::print_statistics();
323 klassItable::print_statistics();
324 }
325 if (VerifyOops) {
326 tty->print_cr("+VerifyOops count: %d", StubRoutines::verify_oop_count());
327 }
328
329 print_bytecode_count();
330 if (PrintMallocStatistics) {
331 tty->print("allocation stats: ");
332 alloc_stats.print();
333 tty->cr();
334 }
335
336 if (PrintSystemDictionaryAtExit) {
337 SystemDictionary::print();
338 }
339
340 if (LogTouchedMethods && PrintTouchedMethodsAtExit) {
341 Method::print_touched_methods(tty);
342 }
343
344 if (PrintBiasedLockingStatistics) {
345 BiasedLocking::print_counters();
346 }
347
348 // Native memory tracking data
349 if (PrintNMTStatistics) {
350 MemTracker::final_report(tty);
351 }
352 }
353
354 #else // PRODUCT MODE STATISTICS
355
356 void print_statistics() {
357
358 if (PrintMethodData) {
359 print_method_profiling_data();
360 }
361
362 if (CITime) {
363 CompileBroker::print_times();
364 }
365
366 if (PrintCodeCache) {
367 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
368 CodeCache::print();
369 }
370
371 if (PrintMethodFlushingStatistics) {
372 NMethodSweeper::print();
373 }
374
375 #ifdef COMPILER2
376 if (PrintPreciseBiasedLockingStatistics || PrintPreciseRTMLockingStatistics) {
377 OptoRuntime::print_named_counters();
378 }
379 #endif
380 if (PrintBiasedLockingStatistics) {
381 BiasedLocking::print_counters();
382 }
383
384 // Native memory tracking data
385 if (PrintNMTStatistics) {
386 MemTracker::final_report(tty);
387 }
388
389 if (LogTouchedMethods && PrintTouchedMethodsAtExit) {
390 Method::print_touched_methods(tty);
391 }
392 }
393
394 #endif
395
396 // Note: before_exit() can be executed only once, if more than one threads
397 // are trying to shutdown the VM at the same time, only one thread
398 // can run before_exit() and all other threads must wait.
399 void before_exit(JavaThread * thread) {
400 #define BEFORE_EXIT_NOT_RUN 0
401 #define BEFORE_EXIT_RUNNING 1
402 #define BEFORE_EXIT_DONE 2
403 static jint volatile _before_exit_status = BEFORE_EXIT_NOT_RUN;
404
405 // Note: don't use a Mutex to guard the entire before_exit(), as
406 // JVMTI post_thread_end_event and post_vm_death_event will run native code.
407 // A CAS or OSMutex would work just fine but then we need to manipulate
408 // thread state for Safepoint. Here we use Monitor wait() and notify_all()
409 // for synchronization.
410 { MutexLocker ml(BeforeExit_lock);
411 switch (_before_exit_status) {
412 case BEFORE_EXIT_NOT_RUN:
413 _before_exit_status = BEFORE_EXIT_RUNNING;
414 break;
415 case BEFORE_EXIT_RUNNING:
416 while (_before_exit_status == BEFORE_EXIT_RUNNING) {
417 BeforeExit_lock->wait();
418 }
419 assert(_before_exit_status == BEFORE_EXIT_DONE, "invalid state");
420 return;
421 case BEFORE_EXIT_DONE:
422 return;
423 }
424 }
425
426 #if INCLUDE_JVMCI
427 JVMCIRuntime::shutdown();
428 #endif
429
430 // Hang forever on exit if we're reporting an error.
431 if (ShowMessageBoxOnError && is_error_reported()) {
432 os::infinite_sleep();
433 }
434
435 // Stop the WatcherThread. We do this before disenrolling various
436 // PeriodicTasks to reduce the likelihood of races.
437 if (PeriodicTask::num_tasks() > 0) {
438 WatcherThread::stop();
439 }
440
441 // Print statistics gathered (profiling ...)
442 if (Arguments::has_profile()) {
443 FlatProfiler::disengage();
444 FlatProfiler::print(10);
445 }
446
447 // shut down the StatSampler task
448 StatSampler::disengage();
449 StatSampler::destroy();
450
451 // Stop concurrent GC threads
452 Universe::heap()->stop();
453
454 // Print GC/heap related information.
455 if (PrintGCDetails) {
456 Universe::print();
457 AdaptiveSizePolicyOutput(0);
458 if (Verbose) {
459 ClassLoaderDataGraph::dump_on(gclog_or_tty);
460 }
461 }
462
463 if (PrintBytecodeHistogram) {
464 BytecodeHistogram::print();
465 }
466
467 if (JvmtiExport::should_post_thread_life()) {
468 JvmtiExport::post_thread_end(thread);
469 }
470
471
472 EventThreadEnd event;
473 if (event.should_commit()) {
474 event.set_javalangthread(java_lang_Thread::thread_id(thread->threadObj()));
475 event.commit();
476 }
477
478 // Always call even when there are not JVMTI environments yet, since environments
479 // may be attached late and JVMTI must track phases of VM execution
480 JvmtiExport::post_vm_death();
481 Threads::shutdown_vm_agents();
482
483 // Terminate the signal thread
484 // Note: we don't wait until it actually dies.
485 os::terminate_signal_thread();
486
487 print_statistics();
488 Universe::heap()->print_tracing_info();
489
490 { MutexLocker ml(BeforeExit_lock);
491 _before_exit_status = BEFORE_EXIT_DONE;
492 BeforeExit_lock->notify_all();
493 }
494
495 if (VerifyStringTableAtExit) {
496 int fail_cnt = 0;
497 {
498 MutexLocker ml(StringTable_lock);
499 fail_cnt = StringTable::verify_and_compare_entries();
500 }
501
502 if (fail_cnt != 0) {
503 tty->print_cr("ERROR: fail_cnt=%d", fail_cnt);
504 guarantee(fail_cnt == 0, "unexpected StringTable verification failures");
505 }
506 }
507
508 #undef BEFORE_EXIT_NOT_RUN
509 #undef BEFORE_EXIT_RUNNING
510 #undef BEFORE_EXIT_DONE
511 }
512
513 void vm_exit(int code) {
514 Thread* thread = Thread::current_or_null();
515 if (thread == NULL) {
516 // we have serious problems -- just exit
517 vm_direct_exit(code);
518 }
519
520 if (VMThread::vm_thread() != NULL) {
521 // Fire off a VM_Exit operation to bring VM to a safepoint and exit
522 VM_Exit op(code);
523 if (thread->is_Java_thread())
524 ((JavaThread*)thread)->set_thread_state(_thread_in_vm);
525 VMThread::execute(&op);
526 // should never reach here; but in case something wrong with VM Thread.
527 vm_direct_exit(code);
528 } else {
529 // VM thread is gone, just exit
530 vm_direct_exit(code);
531 }
532 ShouldNotReachHere();
533 }
534
535 void notify_vm_shutdown() {
536 // For now, just a dtrace probe.
537 HOTSPOT_VM_SHUTDOWN();
538 HS_DTRACE_WORKAROUND_TAIL_CALL_BUG();
539 }
540
541 void vm_direct_exit(int code) {
542 notify_vm_shutdown();
543 os::wait_for_keypress_at_exit();
544 os::exit(code);
545 }
546
547 void vm_perform_shutdown_actions() {
548 // Warning: do not call 'exit_globals()' here. All threads are still running.
549 // Calling 'exit_globals()' will disable thread-local-storage and cause all
550 // kinds of assertions to trigger in debug mode.
551 if (is_init_completed()) {
552 Thread* thread = Thread::current_or_null();
553 if (thread != NULL && thread->is_Java_thread()) {
554 // We are leaving the VM, set state to native (in case any OS exit
555 // handlers call back to the VM)
556 JavaThread* jt = (JavaThread*)thread;
557 // Must always be walkable or have no last_Java_frame when in
558 // thread_in_native
559 jt->frame_anchor()->make_walkable(jt);
560 jt->set_thread_state(_thread_in_native);
561 }
562 }
563 notify_vm_shutdown();
564 }
565
566 void vm_shutdown()
567 {
568 vm_perform_shutdown_actions();
569 os::wait_for_keypress_at_exit();
570 os::shutdown();
571 }
572
573 void vm_abort(bool dump_core) {
574 vm_perform_shutdown_actions();
575 os::wait_for_keypress_at_exit();
576
577 // Flush stdout and stderr before abort.
578 fflush(stdout);
579 fflush(stderr);
580
581 os::abort(dump_core);
582 ShouldNotReachHere();
583 }
584
585 void vm_notify_during_shutdown(const char* error, const char* message) {
586 if (error != NULL) {
587 tty->print_cr("Error occurred during initialization of VM");
588 tty->print("%s", error);
589 if (message != NULL) {
590 tty->print_cr(": %s", message);
591 }
592 else {
593 tty->cr();
594 }
595 }
596 if (ShowMessageBoxOnError && WizardMode) {
597 fatal("Error occurred during initialization of VM");
598 }
599 }
600
601 void vm_exit_during_initialization(Handle exception) {
602 tty->print_cr("Error occurred during initialization of VM");
603 // If there are exceptions on this thread it must be cleared
604 // first and here. Any future calls to EXCEPTION_MARK requires
605 // that no pending exceptions exist.
606 Thread *THREAD = Thread::current_or_null();
607 if (HAS_PENDING_EXCEPTION) {
608 CLEAR_PENDING_EXCEPTION;
609 }
610 java_lang_Throwable::print(exception, tty);
611 tty->cr();
612 java_lang_Throwable::print_stack_trace(exception(), tty);
613 tty->cr();
614 vm_notify_during_shutdown(NULL, NULL);
615
616 // Failure during initialization, we don't want to dump core
617 vm_abort(false);
618 }
619
620 void vm_exit_during_initialization(Symbol* ex, const char* message) {
621 ResourceMark rm;
622 vm_notify_during_shutdown(ex->as_C_string(), message);
623
624 // Failure during initialization, we don't want to dump core
625 vm_abort(false);
626 }
627
628 void vm_exit_during_initialization(const char* error, const char* message) {
629 vm_notify_during_shutdown(error, message);
630
631 // Failure during initialization, we don't want to dump core
632 vm_abort(false);
633 }
634
635 void vm_shutdown_during_initialization(const char* error, const char* message) {
636 vm_notify_during_shutdown(error, message);
637 vm_shutdown();
638 }
639
640 JDK_Version JDK_Version::_current;
641 const char* JDK_Version::_runtime_name;
642 const char* JDK_Version::_runtime_version;
643
644 void JDK_Version::initialize() {
645 jdk_version_info info;
646 assert(!_current.is_valid(), "Don't initialize twice");
647
648 void *lib_handle = os::native_java_library();
649 jdk_version_info_fn_t func = CAST_TO_FN_PTR(jdk_version_info_fn_t,
650 os::dll_lookup(lib_handle, "JDK_GetVersionInfo0"));
651
652 if (func == NULL) {
653 // JDK older than 1.6
654 _current._partially_initialized = true;
655 } else {
656 (*func)(&info, sizeof(info));
657
658 int major = JDK_VERSION_MAJOR(info.jdk_version);
659 int minor = JDK_VERSION_MINOR(info.jdk_version);
660 int micro = JDK_VERSION_MICRO(info.jdk_version);
661 int build = JDK_VERSION_BUILD(info.jdk_version);
662 if (major == 1 && minor > 4) {
663 // We represent "1.5.0" as "5.0", but 1.4.2 as itself.
664 major = minor;
665 minor = micro;
666 micro = 0;
667 }
668 // Incompatible with pre-4243978 JDK.
669 if (info.pending_list_uses_discovered_field == 0) {
670 vm_exit_during_initialization(
671 "Incompatible JDK is not using Reference.discovered field for pending list");
672 }
673 _current = JDK_Version(major, minor, micro, info.update_version,
674 info.special_update_version, build,
675 info.thread_park_blocker == 1,
676 info.post_vm_init_hook_enabled == 1);
677 }
678 }
679
680 void JDK_Version::fully_initialize(
681 uint8_t major, uint8_t minor, uint8_t micro, uint8_t update) {
682 // This is only called when current is less than 1.6 and we've gotten
683 // far enough in the initialization to determine the exact version.
684 assert(major < 6, "not needed for JDK version >= 6");
685 assert(is_partially_initialized(), "must not initialize");
686 if (major < 5) {
687 // JDK verison sequence: 1.2.x, 1.3.x, 1.4.x, 5.0.x, 6.0.x, etc.
688 micro = minor;
689 minor = major;
690 major = 1;
691 }
692 _current = JDK_Version(major, minor, micro, update);
693 }
694
695 void JDK_Version_init() {
696 JDK_Version::initialize();
697 }
698
699 static int64_t encode_jdk_version(const JDK_Version& v) {
700 return
701 ((int64_t)v.major_version() << (BitsPerByte * 5)) |
702 ((int64_t)v.minor_version() << (BitsPerByte * 4)) |
703 ((int64_t)v.micro_version() << (BitsPerByte * 3)) |
704 ((int64_t)v.update_version() << (BitsPerByte * 2)) |
705 ((int64_t)v.special_update_version() << (BitsPerByte * 1)) |
706 ((int64_t)v.build_number() << (BitsPerByte * 0));
707 }
708
709 int JDK_Version::compare(const JDK_Version& other) const {
710 assert(is_valid() && other.is_valid(), "Invalid version (uninitialized?)");
711 if (!is_partially_initialized() && other.is_partially_initialized()) {
712 return -(other.compare(*this)); // flip the comparators
713 }
714 assert(!other.is_partially_initialized(), "Not initialized yet");
715 if (is_partially_initialized()) {
716 assert(other.major_version() >= 6,
717 "Invalid JDK version comparison during initialization");
718 return -1;
719 } else {
720 uint64_t e = encode_jdk_version(*this);
721 uint64_t o = encode_jdk_version(other);
722 return (e > o) ? 1 : ((e == o) ? 0 : -1);
723 }
724 }
725
726 void JDK_Version::to_string(char* buffer, size_t buflen) const {
727 assert(buffer && buflen > 0, "call with useful buffer");
728 size_t index = 0;
729
730 if (!is_valid()) {
731 jio_snprintf(buffer, buflen, "%s", "(uninitialized)");
732 } else if (is_partially_initialized()) {
733 jio_snprintf(buffer, buflen, "%s", "(uninitialized) pre-1.6.0");
734 } else {
735 int rc = jio_snprintf(
736 &buffer[index], buflen - index, "%d.%d", _major, _minor);
737 if (rc == -1) return;
738 index += rc;
739 if (_micro > 0) {
740 rc = jio_snprintf(&buffer[index], buflen - index, ".%d", _micro);
741 }
742 if (_update > 0) {
743 rc = jio_snprintf(&buffer[index], buflen - index, "_%02d", _update);
744 if (rc == -1) return;
745 index += rc;
746 }
747 if (_special > 0) {
748 rc = jio_snprintf(&buffer[index], buflen - index, "%c", _special);
749 if (rc == -1) return;
750 index += rc;
751 }
752 if (_build > 0) {
753 rc = jio_snprintf(&buffer[index], buflen - index, "-b%02d", _build);
754 if (rc == -1) return;
755 index += rc;
756 }
757 }
758 }