1 /*
2 * Copyright (c) 1997, 2017, 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 "aot/aotLoader.hpp"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/stringTable.hpp"
29 #include "classfile/systemDictionary.hpp"
30 #include "code/codeCache.hpp"
31 #include "compiler/compileBroker.hpp"
32 #include "compiler/compilerOracle.hpp"
33 #include "gc/shared/genCollectedHeap.hpp"
34 #include "interpreter/bytecodeHistogram.hpp"
35 #if INCLUDE_JVMCI
36 #include "jvmci/jvmciCompiler.hpp"
37 #include "jvmci/jvmciRuntime.hpp"
38 #endif
39 #include "logging/log.hpp"
40 #include "logging/logStream.hpp"
41 #include "memory/oopFactory.hpp"
42 #include "memory/resourceArea.hpp"
43 #include "memory/universe.hpp"
44 #include "oops/constantPool.hpp"
45 #include "oops/generateOopMap.hpp"
46 #include "oops/instanceKlass.hpp"
47 #include "oops/instanceOop.hpp"
48 #include "oops/method.hpp"
49 #include "oops/objArrayOop.hpp"
50 #include "oops/oop.inline.hpp"
51 #include "oops/symbol.hpp"
52 #include "prims/jvm.h"
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/fprofiler.hpp"
59 #include "runtime/init.hpp"
60 #include "runtime/interfaceSupport.hpp"
61 #include "runtime/java.hpp"
62 #include "runtime/memprofiler.hpp"
63 #include "runtime/sharedRuntime.hpp"
64 #include "runtime/statSampler.hpp"
65 #include "runtime/sweeper.hpp"
66 #include "runtime/task.hpp"
67 #include "runtime/thread.inline.hpp"
68 #include "runtime/timer.hpp"
69 #include "runtime/vm_operations.hpp"
70 #include "services/memTracker.hpp"
71 #include "trace/traceMacros.hpp"
72 #include "trace/tracing.hpp"
73 #include "utilities/dtrace.hpp"
74 #include "utilities/globalDefinitions.hpp"
75 #include "utilities/histogram.hpp"
76 #include "utilities/macros.hpp"
77 #include "utilities/vmError.hpp"
78 #if INCLUDE_ALL_GCS
79 #include "gc/cms/concurrentMarkSweepThread.hpp"
80 #include "gc/parallel/psScavenge.hpp"
81 #endif // INCLUDE_ALL_GCS
82 #ifdef COMPILER1
83 #include "c1/c1_Compiler.hpp"
84 #include "c1/c1_Runtime1.hpp"
85 #endif
86 #ifdef COMPILER2
87 #include "code/compiledIC.hpp"
88 #include "compiler/methodLiveness.hpp"
89 #include "opto/compile.hpp"
90 #include "opto/indexSet.hpp"
91 #include "opto/runtime.hpp"
92 #endif
93
94 GrowableArray<Method*>* collected_profiled_methods;
95
96 int compare_methods(Method** a, Method** b) {
97 // %%% there can be 32-bit overflow here
98 return ((*b)->invocation_count() + (*b)->compiled_invocation_count())
99 - ((*a)->invocation_count() + (*a)->compiled_invocation_count());
100 }
101
102 void collect_profiled_methods(Method* m) {
103 Thread* thread = Thread::current();
104 methodHandle mh(thread, m);
105 if ((m->method_data() != NULL) &&
106 (PrintMethodData || CompilerOracle::should_print(mh))) {
107 collected_profiled_methods->push(m);
108 }
109 }
110
111 void print_method_profiling_data() {
112 if (ProfileInterpreter COMPILER1_PRESENT(|| C1UpdateMethodData) &&
113 (PrintMethodData || CompilerOracle::should_print_methods())) {
114 ResourceMark rm;
115 HandleMark hm;
116 collected_profiled_methods = new GrowableArray<Method*>(1024);
117 SystemDictionary::methods_do(collect_profiled_methods);
118 collected_profiled_methods->sort(&compare_methods);
119
120 int count = collected_profiled_methods->length();
121 int total_size = 0;
122 if (count > 0) {
123 for (int index = 0; index < count; index++) {
124 Method* m = collected_profiled_methods->at(index);
125 ttyLocker ttyl;
126 tty->print_cr("------------------------------------------------------------------------");
127 m->print_invocation_count();
128 tty->print_cr(" mdo size: %d bytes", m->method_data()->size_in_bytes());
129 tty->cr();
130 // Dump data on parameters if any
131 if (m->method_data() != NULL && m->method_data()->parameters_type_data() != NULL) {
132 tty->fill_to(2);
133 m->method_data()->parameters_type_data()->print_data_on(tty);
134 }
135 m->print_codes();
136 total_size += m->method_data()->size_in_bytes();
137 }
138 tty->print_cr("------------------------------------------------------------------------");
139 tty->print_cr("Total MDO size: %d bytes", total_size);
140 }
141 }
142 }
143
144
145 #ifndef PRODUCT
146
147 // Statistics printing (method invocation histogram)
148
149 GrowableArray<Method*>* collected_invoked_methods;
150
151 void collect_invoked_methods(Method* m) {
152 if (m->invocation_count() + m->compiled_invocation_count() >= 1 ) {
153 collected_invoked_methods->push(m);
154 }
155 }
156
157
158
159
160 void print_method_invocation_histogram() {
161 ResourceMark rm;
162 HandleMark hm;
163 collected_invoked_methods = new GrowableArray<Method*>(1024);
164 SystemDictionary::methods_do(collect_invoked_methods);
165 collected_invoked_methods->sort(&compare_methods);
166 //
167 tty->cr();
168 tty->print_cr("Histogram Over Method Invocation Counters (cutoff = " INTX_FORMAT "):", MethodHistogramCutoff);
169 tty->cr();
170 tty->print_cr("____Count_(I+C)____Method________________________Module_________________");
171 unsigned total = 0, int_total = 0, comp_total = 0, static_total = 0, final_total = 0,
172 synch_total = 0, nativ_total = 0, acces_total = 0;
173 for (int index = 0; index < collected_invoked_methods->length(); index++) {
174 Method* m = collected_invoked_methods->at(index);
175 int c = m->invocation_count() + m->compiled_invocation_count();
176 if (c >= MethodHistogramCutoff) m->print_invocation_count();
177 int_total += m->invocation_count();
178 comp_total += m->compiled_invocation_count();
179 if (m->is_final()) final_total += c;
180 if (m->is_static()) static_total += c;
181 if (m->is_synchronized()) synch_total += c;
182 if (m->is_native()) nativ_total += c;
183 if (m->is_accessor()) acces_total += c;
184 }
185 tty->cr();
186 total = int_total + comp_total;
187 tty->print_cr("Invocations summary:");
188 tty->print_cr("\t%9d (%4.1f%%) interpreted", int_total, 100.0 * int_total / total);
189 tty->print_cr("\t%9d (%4.1f%%) compiled", comp_total, 100.0 * comp_total / total);
190 tty->print_cr("\t%9d (100%%) total", total);
191 tty->print_cr("\t%9d (%4.1f%%) synchronized", synch_total, 100.0 * synch_total / total);
192 tty->print_cr("\t%9d (%4.1f%%) final", final_total, 100.0 * final_total / total);
193 tty->print_cr("\t%9d (%4.1f%%) static", static_total, 100.0 * static_total / total);
194 tty->print_cr("\t%9d (%4.1f%%) native", nativ_total, 100.0 * nativ_total / total);
195 tty->print_cr("\t%9d (%4.1f%%) accessor", acces_total, 100.0 * acces_total / total);
196 tty->cr();
197 SharedRuntime::print_call_statistics(comp_total);
198 }
199
200 void print_bytecode_count() {
201 if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
202 tty->print_cr("[BytecodeCounter::counter_value = %d]", BytecodeCounter::counter_value());
203 }
204 }
205
206 AllocStats alloc_stats;
207
208
209
210 // General statistics printing (profiling ...)
211 void print_statistics() {
212 #ifdef ASSERT
213
214 if (CountRuntimeCalls) {
215 extern Histogram *RuntimeHistogram;
216 RuntimeHistogram->print();
217 }
218
219 if (CountJNICalls) {
220 extern Histogram *JNIHistogram;
221 JNIHistogram->print();
222 }
223
224 if (CountJVMCalls) {
225 extern Histogram *JVMHistogram;
226 JVMHistogram->print();
227 }
228
229 #endif
230
231 if (MemProfiling) {
232 MemProfiler::disengage();
233 }
234
235 if (CITime) {
236 CompileBroker::print_times();
237 }
238
239 #ifdef COMPILER1
240 if ((PrintC1Statistics || LogVMOutput || LogCompilation) && UseCompiler) {
241 FlagSetting fs(DisplayVMOutput, DisplayVMOutput && PrintC1Statistics);
242 Runtime1::print_statistics();
243 Deoptimization::print_statistics();
244 SharedRuntime::print_statistics();
245 }
246 #endif /* COMPILER1 */
247
248 #ifdef COMPILER2
249 if ((PrintOptoStatistics || LogVMOutput || LogCompilation) && UseCompiler) {
250 FlagSetting fs(DisplayVMOutput, DisplayVMOutput && PrintOptoStatistics);
251 Compile::print_statistics();
252 #ifndef COMPILER1
253 Deoptimization::print_statistics();
254 SharedRuntime::print_statistics();
255 #endif //COMPILER1
256 os::print_statistics();
257 }
258
259 if (PrintLockStatistics || PrintPreciseBiasedLockingStatistics || PrintPreciseRTMLockingStatistics) {
260 OptoRuntime::print_named_counters();
261 }
262
263 if (TimeLivenessAnalysis) {
264 MethodLiveness::print_times();
265 }
266 #ifdef ASSERT
267 if (CollectIndexSetStatistics) {
268 IndexSet::print_statistics();
269 }
270 #endif // ASSERT
271 #else
272 #ifdef INCLUDE_JVMCI
273 #ifndef COMPILER1
274 if ((TraceDeoptimization || LogVMOutput || LogCompilation) && UseCompiler) {
275 FlagSetting fs(DisplayVMOutput, DisplayVMOutput && TraceDeoptimization);
276 Deoptimization::print_statistics();
277 SharedRuntime::print_statistics();
278 }
279 #endif
280 #endif
281 #endif
282
283 if (PrintAOTStatistics) {
284 AOTLoader::print_statistics();
285 }
286
287 if (PrintNMethodStatistics) {
288 nmethod::print_statistics();
289 }
290 if (CountCompiledCalls) {
291 print_method_invocation_histogram();
292 }
293
294 print_method_profiling_data();
295
296 if (TimeCompilationPolicy) {
297 CompilationPolicy::policy()->print_time();
298 }
299 if (TimeOopMap) {
300 GenerateOopMap::print_time();
301 }
302 if (ProfilerCheckIntervals) {
303 PeriodicTask::print_intervals();
304 }
305 if (PrintSymbolTableSizeHistogram) {
306 SymbolTable::print_histogram();
307 }
308 if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
309 BytecodeCounter::print();
310 }
311 if (PrintBytecodePairHistogram) {
312 BytecodePairHistogram::print();
313 }
314
315 if (PrintCodeCache) {
316 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
317 CodeCache::print();
318 }
319
320 if (PrintMethodFlushingStatistics) {
321 NMethodSweeper::print();
322 }
323
324 if (PrintCodeCache2) {
325 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
326 CodeCache::print_internals();
327 }
328
329 if (PrintVtableStats) {
330 klassVtable::print_statistics();
331 klassItable::print_statistics();
332 }
333 if (VerifyOops) {
334 tty->print_cr("+VerifyOops count: %d", StubRoutines::verify_oop_count());
335 }
336
337 print_bytecode_count();
338 if (PrintMallocStatistics) {
339 tty->print("allocation stats: ");
340 alloc_stats.print();
341 tty->cr();
342 }
343
344 if (PrintSystemDictionaryAtExit) {
345 SystemDictionary::print();
346 }
347
348 if (LogTouchedMethods && PrintTouchedMethodsAtExit) {
349 Method::print_touched_methods(tty);
350 }
351
352 if (PrintBiasedLockingStatistics) {
353 BiasedLocking::print_counters();
354 }
355
356 // Native memory tracking data
357 if (PrintNMTStatistics) {
358 MemTracker::final_report(tty);
359 }
360 }
361
362 #else // PRODUCT MODE STATISTICS
363
364 void print_statistics() {
365
366 if (PrintMethodData) {
367 print_method_profiling_data();
368 }
369
370 if (CITime) {
371 CompileBroker::print_times();
372 }
373
374 if (PrintCodeCache) {
375 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
376 CodeCache::print();
377 }
378
379 if (PrintMethodFlushingStatistics) {
380 NMethodSweeper::print();
381 }
382
383 #ifdef COMPILER2
384 if (PrintPreciseBiasedLockingStatistics || PrintPreciseRTMLockingStatistics) {
385 OptoRuntime::print_named_counters();
386 }
387 #endif
388 if (PrintBiasedLockingStatistics) {
389 BiasedLocking::print_counters();
390 }
391
392 // Native memory tracking data
393 if (PrintNMTStatistics) {
394 MemTracker::final_report(tty);
395 }
396
397 if (LogTouchedMethods && PrintTouchedMethodsAtExit) {
398 Method::print_touched_methods(tty);
399 }
400 }
401
402 #endif
403
404 // Note: before_exit() can be executed only once, if more than one threads
405 // are trying to shutdown the VM at the same time, only one thread
406 // can run before_exit() and all other threads must wait.
407 void before_exit(JavaThread* thread) {
408 #define BEFORE_EXIT_NOT_RUN 0
409 #define BEFORE_EXIT_RUNNING 1
410 #define BEFORE_EXIT_DONE 2
411 static jint volatile _before_exit_status = BEFORE_EXIT_NOT_RUN;
412
413 // Note: don't use a Mutex to guard the entire before_exit(), as
414 // JVMTI post_thread_end_event and post_vm_death_event will run native code.
415 // A CAS or OSMutex would work just fine but then we need to manipulate
416 // thread state for Safepoint. Here we use Monitor wait() and notify_all()
417 // for synchronization.
418 { MutexLocker ml(BeforeExit_lock);
419 switch (_before_exit_status) {
420 case BEFORE_EXIT_NOT_RUN:
421 _before_exit_status = BEFORE_EXIT_RUNNING;
422 break;
423 case BEFORE_EXIT_RUNNING:
424 while (_before_exit_status == BEFORE_EXIT_RUNNING) {
425 BeforeExit_lock->wait();
426 }
427 assert(_before_exit_status == BEFORE_EXIT_DONE, "invalid state");
428 return;
429 case BEFORE_EXIT_DONE:
430 // need block to avoid SS compiler bug
431 {
432 return;
433 }
434 }
435 }
436
437 #if INCLUDE_JVMCI
438 // We are not using CATCH here because we want the exit to continue normally.
439 Thread* THREAD = thread;
440 JVMCIRuntime::shutdown(THREAD);
441 if (HAS_PENDING_EXCEPTION) {
442 HandleMark hm(THREAD);
443 Handle exception(THREAD, PENDING_EXCEPTION);
444 CLEAR_PENDING_EXCEPTION;
445 java_lang_Throwable::java_printStackTrace(exception, THREAD);
446 }
447 #endif
448
449 // Hang forever on exit if we're reporting an error.
450 if (ShowMessageBoxOnError && VMError::is_error_reported()) {
451 os::infinite_sleep();
452 }
453
454 EventThreadEnd event;
455 if (event.should_commit()) {
456 event.set_thread(THREAD_TRACE_ID(thread));
457 event.commit();
458 }
459
460 TRACE_VM_EXIT();
461
462 // Stop the WatcherThread. We do this before disenrolling various
463 // PeriodicTasks to reduce the likelihood of races.
464 if (PeriodicTask::num_tasks() > 0) {
465 WatcherThread::stop();
466 }
467
468 // Print statistics gathered (profiling ...)
469 if (Arguments::has_profile()) {
470 FlatProfiler::disengage();
471 FlatProfiler::print(10);
472 }
473
474 // shut down the StatSampler task
475 StatSampler::disengage();
476 StatSampler::destroy();
477
478 // Stop concurrent GC threads
479 Universe::heap()->stop();
480
481 // Print GC/heap related information.
482 Log(gc, heap, exit) log;
483 if (log.is_info()) {
484 ResourceMark rm;
485 LogStream ls_info(log.info());
486 Universe::print_on(&ls_info);
487 if (log.is_trace()) {
488 LogStream ls_trace(log.trace());
489 ClassLoaderDataGraph::dump_on(&ls_trace);
490 }
491 }
492
493 if (PrintBytecodeHistogram) {
494 BytecodeHistogram::print();
495 }
496
497 if (JvmtiExport::should_post_thread_life()) {
498 JvmtiExport::post_thread_end(thread);
499 }
500
501 // Always call even when there are not JVMTI environments yet, since environments
502 // may be attached late and JVMTI must track phases of VM execution
503 JvmtiExport::post_vm_death();
504 Threads::shutdown_vm_agents();
505
506 // Terminate the signal thread
507 // Note: we don't wait until it actually dies.
508 os::terminate_signal_thread();
509
510 print_statistics();
511 Universe::heap()->print_tracing_info();
512
513 { MutexLocker ml(BeforeExit_lock);
514 _before_exit_status = BEFORE_EXIT_DONE;
515 BeforeExit_lock->notify_all();
516 }
517
518 if (VerifyStringTableAtExit) {
519 int fail_cnt = 0;
520 {
521 MutexLocker ml(StringTable_lock);
522 fail_cnt = StringTable::verify_and_compare_entries();
523 }
524
525 if (fail_cnt != 0) {
526 tty->print_cr("ERROR: fail_cnt=%d", fail_cnt);
527 guarantee(fail_cnt == 0, "unexpected StringTable verification failures");
528 }
529 }
530
531 #undef BEFORE_EXIT_NOT_RUN
532 #undef BEFORE_EXIT_RUNNING
533 #undef BEFORE_EXIT_DONE
534 }
535
536 void vm_exit(int code) {
537 Thread* thread =
538 ThreadLocalStorage::is_initialized() ? Thread::current_or_null() : NULL;
539 if (thread == NULL) {
540 // very early initialization failure -- just exit
541 vm_direct_exit(code);
542 }
543
544 if (VMThread::vm_thread() != NULL) {
545 // Fire off a VM_Exit operation to bring VM to a safepoint and exit
546 VM_Exit op(code);
547 if (thread->is_Java_thread())
548 ((JavaThread*)thread)->set_thread_state(_thread_in_vm);
549 VMThread::execute(&op);
550 // should never reach here; but in case something wrong with VM Thread.
551 vm_direct_exit(code);
552 } else {
553 // VM thread is gone, just exit
554 vm_direct_exit(code);
555 }
556 ShouldNotReachHere();
557 }
558
559 void notify_vm_shutdown() {
560 // For now, just a dtrace probe.
561 HOTSPOT_VM_SHUTDOWN();
562 HS_DTRACE_WORKAROUND_TAIL_CALL_BUG();
563 }
564
565 void vm_direct_exit(int code) {
566 notify_vm_shutdown();
567 os::wait_for_keypress_at_exit();
568 os::exit(code);
569 }
570
571 void vm_perform_shutdown_actions() {
572 // Warning: do not call 'exit_globals()' here. All threads are still running.
573 // Calling 'exit_globals()' will disable thread-local-storage and cause all
574 // kinds of assertions to trigger in debug mode.
575 if (is_init_completed()) {
576 Thread* thread = Thread::current_or_null();
577 if (thread != NULL && thread->is_Java_thread()) {
578 // We are leaving the VM, set state to native (in case any OS exit
579 // handlers call back to the VM)
580 JavaThread* jt = (JavaThread*)thread;
581 // Must always be walkable or have no last_Java_frame when in
582 // thread_in_native
583 jt->frame_anchor()->make_walkable(jt);
584 jt->set_thread_state(_thread_in_native);
585 }
586 }
587 notify_vm_shutdown();
588 }
589
590 void vm_shutdown()
591 {
592 vm_perform_shutdown_actions();
593 os::wait_for_keypress_at_exit();
594 os::shutdown();
595 }
596
597 void vm_abort(bool dump_core) {
598 vm_perform_shutdown_actions();
599 os::wait_for_keypress_at_exit();
600
601 // Flush stdout and stderr before abort.
602 fflush(stdout);
603 fflush(stderr);
604
605 os::abort(dump_core);
606 ShouldNotReachHere();
607 }
608
609 void vm_notify_during_shutdown(const char* error, const char* message) {
610 if (error != NULL) {
611 tty->print_cr("Error occurred during initialization of VM");
612 tty->print("%s", error);
613 if (message != NULL) {
614 tty->print_cr(": %s", message);
615 }
616 else {
617 tty->cr();
618 }
619 }
620 if (ShowMessageBoxOnError && WizardMode) {
621 fatal("Error occurred during initialization of VM");
622 }
623 }
624
625 void vm_exit_during_initialization() {
626 vm_notify_during_shutdown(NULL, NULL);
627
628 // Failure during initialization, we don't want to dump core
629 vm_abort(false);
630 }
631
632 void vm_exit_during_initialization(Handle exception) {
633 tty->print_cr("Error occurred during initialization of VM");
634 // If there are exceptions on this thread it must be cleared
635 // first and here. Any future calls to EXCEPTION_MARK requires
636 // that no pending exceptions exist.
637 Thread *THREAD = Thread::current(); // can't be NULL
638 if (HAS_PENDING_EXCEPTION) {
639 CLEAR_PENDING_EXCEPTION;
640 }
641 java_lang_Throwable::print_stack_trace(exception, tty);
642 tty->cr();
643 vm_notify_during_shutdown(NULL, NULL);
644
645 // Failure during initialization, we don't want to dump core
646 vm_abort(false);
647 }
648
649 void vm_exit_during_initialization(Symbol* ex, const char* message) {
650 ResourceMark rm;
651 vm_notify_during_shutdown(ex->as_C_string(), message);
652
653 // Failure during initialization, we don't want to dump core
654 vm_abort(false);
655 }
656
657 void vm_exit_during_initialization(const char* error, const char* message) {
658 vm_notify_during_shutdown(error, message);
659
660 // Failure during initialization, we don't want to dump core
661 vm_abort(false);
662 }
663
664 void vm_shutdown_during_initialization(const char* error, const char* message) {
665 vm_notify_during_shutdown(error, message);
666 vm_shutdown();
667 }
668
669 JDK_Version JDK_Version::_current;
670 const char* JDK_Version::_runtime_name;
671 const char* JDK_Version::_runtime_version;
672
673 void JDK_Version::initialize() {
674 jdk_version_info info;
675 assert(!_current.is_valid(), "Don't initialize twice");
676
677 void *lib_handle = os::native_java_library();
678 jdk_version_info_fn_t func = CAST_TO_FN_PTR(jdk_version_info_fn_t,
679 os::dll_lookup(lib_handle, "JDK_GetVersionInfo0"));
680
681 assert(func != NULL, "Support for JDK 1.5 or older has been removed after JEP-223");
682
683 (*func)(&info, sizeof(info));
684
685 int major = JDK_VERSION_MAJOR(info.jdk_version);
686 int minor = JDK_VERSION_MINOR(info.jdk_version);
687 int security = JDK_VERSION_SECURITY(info.jdk_version);
688 int build = JDK_VERSION_BUILD(info.jdk_version);
689
690 // Incompatible with pre-4243978 JDK.
691 if (info.pending_list_uses_discovered_field == 0) {
692 vm_exit_during_initialization(
693 "Incompatible JDK is not using Reference.discovered field for pending list");
694 }
695 _current = JDK_Version(major, minor, security, info.patch_version, build,
696 info.thread_park_blocker == 1,
697 info.post_vm_init_hook_enabled == 1);
698 }
699
700 void JDK_Version_init() {
701 JDK_Version::initialize();
702 }
703
704 static int64_t encode_jdk_version(const JDK_Version& v) {
705 return
706 ((int64_t)v.major_version() << (BitsPerByte * 4)) |
707 ((int64_t)v.minor_version() << (BitsPerByte * 3)) |
708 ((int64_t)v.security_version() << (BitsPerByte * 2)) |
709 ((int64_t)v.patch_version() << (BitsPerByte * 1)) |
710 ((int64_t)v.build_number() << (BitsPerByte * 0));
711 }
712
713 int JDK_Version::compare(const JDK_Version& other) const {
714 assert(is_valid() && other.is_valid(), "Invalid version (uninitialized?)");
715 uint64_t e = encode_jdk_version(*this);
716 uint64_t o = encode_jdk_version(other);
717 return (e > o) ? 1 : ((e == o) ? 0 : -1);
718 }
719
720 void JDK_Version::to_string(char* buffer, size_t buflen) const {
721 assert(buffer && buflen > 0, "call with useful buffer");
722 size_t index = 0;
723
724 if (!is_valid()) {
725 jio_snprintf(buffer, buflen, "%s", "(uninitialized)");
726 } else {
727 int rc = jio_snprintf(
728 &buffer[index], buflen - index, "%d.%d", _major, _minor);
729 if (rc == -1) return;
730 index += rc;
731 if (_security > 0) {
732 rc = jio_snprintf(&buffer[index], buflen - index, ".%d", _security);
733 if (rc == -1) return;
734 index += rc;
735 }
736 if (_patch > 0) {
737 rc = jio_snprintf(&buffer[index], buflen - index, ".%d", _patch);
738 if (rc == -1) return;
739 index += rc;
740 }
741 if (_build > 0) {
742 rc = jio_snprintf(&buffer[index], buflen - index, "+%d", _build);
743 if (rc == -1) return;
744 index += rc;
745 }
746 }
747 }