1 /* 2 * Copyright (c) 1997, 2011, 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/symbolTable.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/constantPoolOop.hpp" 37 #include "oops/generateOopMap.hpp" 38 #include "oops/instanceKlass.hpp" 39 #include "oops/instanceKlassKlass.hpp" 40 #include "oops/instanceOop.hpp" 41 #include "oops/methodOop.hpp" 42 #include "oops/objArrayOop.hpp" 43 #include "oops/oop.inline.hpp" 44 #include "oops/symbol.hpp" 45 #include "prims/jvmtiExport.hpp" 46 #include "runtime/aprofiler.hpp" 47 #include "runtime/arguments.hpp" 48 #include "runtime/biasedLocking.hpp" 49 #include "runtime/compilationPolicy.hpp" 50 #include "runtime/fprofiler.hpp" 51 #include "runtime/init.hpp" 52 #include "runtime/interfaceSupport.hpp" 53 #include "runtime/java.hpp" 54 #include "runtime/memprofiler.hpp" 55 #include "runtime/sharedRuntime.hpp" 56 #include "runtime/statSampler.hpp" 57 #include "runtime/task.hpp" 58 #include "runtime/timer.hpp" 59 #include "runtime/vm_operations.hpp" 60 #include "utilities/dtrace.hpp" 61 #include "utilities/globalDefinitions.hpp" 62 #include "utilities/histogram.hpp" 63 #include "utilities/vmError.hpp" 64 #ifdef TARGET_ARCH_x86 65 # include "vm_version_x86.hpp" 66 #endif 67 #ifdef TARGET_ARCH_sparc 68 # include "vm_version_sparc.hpp" 69 #endif 70 #ifdef TARGET_ARCH_zero 71 # include "vm_version_zero.hpp" 72 #endif 73 #ifdef TARGET_OS_FAMILY_linux 74 # include "thread_linux.inline.hpp" 75 #endif 76 #ifdef TARGET_OS_FAMILY_solaris 77 # include "thread_solaris.inline.hpp" 78 #endif 79 #ifdef TARGET_OS_FAMILY_windows 80 # include "thread_windows.inline.hpp" 81 #endif 82 #ifndef SERIALGC 83 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp" 84 #include "gc_implementation/parallelScavenge/psScavenge.hpp" 85 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp" 86 #endif 87 #ifdef COMPILER1 88 #include "c1/c1_Compiler.hpp" 89 #include "c1/c1_Runtime1.hpp" 90 #endif 91 #ifdef COMPILER2 92 #include "code/compiledIC.hpp" 93 #include "compiler/methodLiveness.hpp" 94 #include "opto/compile.hpp" 95 #include "opto/indexSet.hpp" 96 #include "opto/runtime.hpp" 97 #endif 98 99 HS_DTRACE_PROBE_DECL(hotspot, vm__shutdown); 100 101 #ifndef PRODUCT 102 103 // Statistics printing (method invocation histogram) 104 105 GrowableArray<methodOop>* collected_invoked_methods; 106 107 void collect_invoked_methods(methodOop m) { 108 if (m->invocation_count() + m->compiled_invocation_count() >= 1 ) { 109 collected_invoked_methods->push(m); 110 } 111 } 112 113 114 GrowableArray<methodOop>* collected_profiled_methods; 115 116 void collect_profiled_methods(methodOop m) { 117 methodHandle mh(Thread::current(), m); 118 if ((m->method_data() != NULL) && 119 (PrintMethodData || CompilerOracle::should_print(mh))) { 120 collected_profiled_methods->push(m); 121 } 122 } 123 124 125 int compare_methods(methodOop* a, methodOop* b) { 126 // %%% there can be 32-bit overflow here 127 return ((*b)->invocation_count() + (*b)->compiled_invocation_count()) 128 - ((*a)->invocation_count() + (*a)->compiled_invocation_count()); 129 } 130 131 132 void print_method_invocation_histogram() { 133 ResourceMark rm; 134 HandleMark hm; 135 collected_invoked_methods = new GrowableArray<methodOop>(1024); 136 SystemDictionary::methods_do(collect_invoked_methods); 137 collected_invoked_methods->sort(&compare_methods); 138 // 139 tty->cr(); 140 tty->print_cr("Histogram Over MethodOop Invocation Counters (cutoff = %d):", MethodHistogramCutoff); 141 tty->cr(); 142 tty->print_cr("____Count_(I+C)____Method________________________Module_________________"); 143 unsigned total = 0, int_total = 0, comp_total = 0, static_total = 0, final_total = 0, 144 synch_total = 0, nativ_total = 0, acces_total = 0; 145 for (int index = 0; index < collected_invoked_methods->length(); index++) { 146 methodOop m = collected_invoked_methods->at(index); 147 int c = m->invocation_count() + m->compiled_invocation_count(); 148 if (c >= MethodHistogramCutoff) m->print_invocation_count(); 149 int_total += m->invocation_count(); 150 comp_total += m->compiled_invocation_count(); 151 if (m->is_final()) final_total += c; 152 if (m->is_static()) static_total += c; 153 if (m->is_synchronized()) synch_total += c; 154 if (m->is_native()) nativ_total += c; 155 if (m->is_accessor()) acces_total += c; 156 } 157 tty->cr(); 158 total = int_total + comp_total; 159 tty->print_cr("Invocations summary:"); 160 tty->print_cr("\t%9d (%4.1f%%) interpreted", int_total, 100.0 * int_total / total); 161 tty->print_cr("\t%9d (%4.1f%%) compiled", comp_total, 100.0 * comp_total / total); 162 tty->print_cr("\t%9d (100%%) total", total); 163 tty->print_cr("\t%9d (%4.1f%%) synchronized", synch_total, 100.0 * synch_total / total); 164 tty->print_cr("\t%9d (%4.1f%%) final", final_total, 100.0 * final_total / total); 165 tty->print_cr("\t%9d (%4.1f%%) static", static_total, 100.0 * static_total / total); 166 tty->print_cr("\t%9d (%4.1f%%) native", nativ_total, 100.0 * nativ_total / total); 167 tty->print_cr("\t%9d (%4.1f%%) accessor", acces_total, 100.0 * acces_total / total); 168 tty->cr(); 169 SharedRuntime::print_call_statistics(comp_total); 170 } 171 172 void print_method_profiling_data() { 173 ResourceMark rm; 174 HandleMark hm; 175 collected_profiled_methods = new GrowableArray<methodOop>(1024); 176 SystemDictionary::methods_do(collect_profiled_methods); 177 collected_profiled_methods->sort(&compare_methods); 178 179 int count = collected_profiled_methods->length(); 180 if (count > 0) { 181 for (int index = 0; index < count; index++) { 182 methodOop m = collected_profiled_methods->at(index); 183 ttyLocker ttyl; 184 tty->print_cr("------------------------------------------------------------------------"); 185 //m->print_name(tty); 186 m->print_invocation_count(); 187 tty->cr(); 188 m->print_codes(); 189 } 190 tty->print_cr("------------------------------------------------------------------------"); 191 } 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 ...) 205 206 void print_statistics() { 207 208 #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 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 #endif //COMPILER1 252 SharedRuntime::print_statistics(); 253 os::print_statistics(); 254 } 255 256 if (PrintLockStatistics || PrintPreciseBiasedLockingStatistics) { 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 if (ProfileInterpreter COMPILER1_PRESENT(|| C1UpdateMethodData)) { 273 print_method_profiling_data(); 274 } 275 if (TimeCompiler) { 276 COMPILER2_PRESENT(Compile::print_timers();) 277 } 278 if (TimeCompilationPolicy) { 279 CompilationPolicy::policy()->print_time(); 280 } 281 if (TimeOopMap) { 282 GenerateOopMap::print_time(); 283 } 284 if (ProfilerCheckIntervals) { 285 PeriodicTask::print_intervals(); 286 } 287 if (PrintSymbolTableSizeHistogram) { 288 SymbolTable::print_histogram(); 289 } 290 if (CountBytecodes || TraceBytecodes || StopInterpreterAt) { 291 BytecodeCounter::print(); 292 } 293 if (PrintBytecodePairHistogram) { 294 BytecodePairHistogram::print(); 295 } 296 297 if (PrintCodeCache) { 298 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 299 CodeCache::print(); 300 } 301 302 if (PrintCodeCache2) { 303 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 304 CodeCache::print_internals(); 305 } 306 307 if (PrintClassStatistics) { 308 SystemDictionary::print_class_statistics(); 309 } 310 if (PrintMethodStatistics) { 311 SystemDictionary::print_method_statistics(); 312 } 313 314 if (PrintVtableStats) { 315 klassVtable::print_statistics(); 316 klassItable::print_statistics(); 317 } 318 if (VerifyOops) { 319 tty->print_cr("+VerifyOops count: %d", StubRoutines::verify_oop_count()); 320 } 321 322 print_bytecode_count(); 323 if (PrintMallocStatistics) { 324 tty->print("allocation stats: "); 325 alloc_stats.print(); 326 tty->cr(); 327 } 328 329 if (PrintSystemDictionaryAtExit) { 330 SystemDictionary::print(); 331 } 332 333 if (PrintBiasedLockingStatistics) { 334 BiasedLocking::print_counters(); 335 } 336 337 #ifdef ENABLE_ZAP_DEAD_LOCALS 338 #ifdef COMPILER2 339 if (ZapDeadCompiledLocals) { 340 tty->print_cr("Compile::CompiledZap_count = %d", Compile::CompiledZap_count); 341 tty->print_cr("OptoRuntime::ZapDeadCompiledLocals_count = %d", OptoRuntime::ZapDeadCompiledLocals_count); 342 } 343 #endif // COMPILER2 344 #endif // ENABLE_ZAP_DEAD_LOCALS 345 } 346 347 #else // PRODUCT MODE STATISTICS 348 349 void print_statistics() { 350 351 if (CITime) { 352 CompileBroker::print_times(); 353 } 354 #ifdef COMPILER2 355 if (PrintPreciseBiasedLockingStatistics) { 356 OptoRuntime::print_named_counters(); 357 } 358 #endif 359 if (PrintBiasedLockingStatistics) { 360 BiasedLocking::print_counters(); 361 } 362 } 363 364 #endif 365 366 367 // Helper class for registering on_exit calls through JVM_OnExit 368 369 extern "C" { 370 typedef void (*__exit_proc)(void); 371 } 372 373 class ExitProc : public CHeapObj { 374 private: 375 __exit_proc _proc; 376 // void (*_proc)(void); 377 ExitProc* _next; 378 public: 379 // ExitProc(void (*proc)(void)) { 380 ExitProc(__exit_proc proc) { 381 _proc = proc; 382 _next = NULL; 383 } 384 void evaluate() { _proc(); } 385 ExitProc* next() const { return _next; } 386 void set_next(ExitProc* next) { _next = next; } 387 }; 388 389 390 // Linked list of registered on_exit procedures 391 392 static ExitProc* exit_procs = NULL; 393 394 395 extern "C" { 396 void register_on_exit_function(void (*func)(void)) { 397 ExitProc *entry = new ExitProc(func); 398 // Classic vm does not throw an exception in case the allocation failed, 399 if (entry != NULL) { 400 entry->set_next(exit_procs); 401 exit_procs = entry; 402 } 403 } 404 } 405 406 // Note: before_exit() can be executed only once, if more than one threads 407 // are trying to shutdown the VM at the same time, only one thread 408 // can run before_exit() and all other threads must wait. 409 void before_exit(JavaThread * thread) { 410 #define BEFORE_EXIT_NOT_RUN 0 411 #define BEFORE_EXIT_RUNNING 1 412 #define BEFORE_EXIT_DONE 2 413 static jint volatile _before_exit_status = BEFORE_EXIT_NOT_RUN; 414 415 // Note: don't use a Mutex to guard the entire before_exit(), as 416 // JVMTI post_thread_end_event and post_vm_death_event will run native code. 417 // A CAS or OSMutex would work just fine but then we need to manipulate 418 // thread state for Safepoint. Here we use Monitor wait() and notify_all() 419 // for synchronization. 420 { MutexLocker ml(BeforeExit_lock); 421 switch (_before_exit_status) { 422 case BEFORE_EXIT_NOT_RUN: 423 _before_exit_status = BEFORE_EXIT_RUNNING; 424 break; 425 case BEFORE_EXIT_RUNNING: 426 while (_before_exit_status == BEFORE_EXIT_RUNNING) { 427 BeforeExit_lock->wait(); 428 } 429 assert(_before_exit_status == BEFORE_EXIT_DONE, "invalid state"); 430 return; 431 case BEFORE_EXIT_DONE: 432 return; 433 } 434 } 435 436 // The only difference between this and Win32's _onexit procs is that 437 // this version is invoked before any threads get killed. 438 ExitProc* current = exit_procs; 439 while (current != NULL) { 440 ExitProc* next = current->next(); 441 current->evaluate(); 442 delete current; 443 current = next; 444 } 445 446 // Hang forever on exit if we're reporting an error. 447 if (ShowMessageBoxOnError && is_error_reported()) { 448 os::infinite_sleep(); 449 } 450 451 // Terminate watcher thread - must before disenrolling any periodic task 452 if (PeriodicTask::num_tasks() > 0) 453 WatcherThread::stop(); 454 455 // Print statistics gathered (profiling ...) 456 if (Arguments::has_profile()) { 457 FlatProfiler::disengage(); 458 FlatProfiler::print(10); 459 } 460 461 // shut down the StatSampler task 462 StatSampler::disengage(); 463 StatSampler::destroy(); 464 465 #ifndef SERIALGC 466 // stop CMS threads 467 if (UseConcMarkSweepGC) { 468 ConcurrentMarkSweepThread::stop(); 469 } 470 #endif // SERIALGC 471 472 // Print GC/heap related information. 473 if (PrintGCDetails) { 474 Universe::print(); 475 AdaptiveSizePolicyOutput(0); 476 } 477 478 479 if (Arguments::has_alloc_profile()) { 480 HandleMark hm; 481 // Do one last collection to enumerate all the objects 482 // allocated since the last one. 483 Universe::heap()->collect(GCCause::_allocation_profiler); 484 AllocationProfiler::disengage(); 485 AllocationProfiler::print(0); 486 } 487 488 if (PrintBytecodeHistogram) { 489 BytecodeHistogram::print(); 490 } 491 492 if (JvmtiExport::should_post_thread_life()) { 493 JvmtiExport::post_thread_end(thread); 494 } 495 // Always call even when there are not JVMTI environments yet, since environments 496 // may be attached late and JVMTI must track phases of VM execution 497 JvmtiExport::post_vm_death(); 498 Threads::shutdown_vm_agents(); 499 500 // Terminate the signal thread 501 // Note: we don't wait until it actually dies. 502 os::terminate_signal_thread(); 503 504 print_statistics(); 505 Universe::heap()->print_tracing_info(); 506 507 { MutexLocker ml(BeforeExit_lock); 508 _before_exit_status = BEFORE_EXIT_DONE; 509 BeforeExit_lock->notify_all(); 510 } 511 512 #undef BEFORE_EXIT_NOT_RUN 513 #undef BEFORE_EXIT_RUNNING 514 #undef BEFORE_EXIT_DONE 515 } 516 517 void vm_exit(int code) { 518 Thread* thread = ThreadLocalStorage::is_initialized() ? 519 ThreadLocalStorage::get_thread_slow() : NULL; 520 if (thread == NULL) { 521 // we have serious problems -- just exit 522 vm_direct_exit(code); 523 } 524 525 if (VMThread::vm_thread() != NULL) { 526 // Fire off a VM_Exit operation to bring VM to a safepoint and exit 527 VM_Exit op(code); 528 if (thread->is_Java_thread()) 529 ((JavaThread*)thread)->set_thread_state(_thread_in_vm); 530 VMThread::execute(&op); 531 // should never reach here; but in case something wrong with VM Thread. 532 vm_direct_exit(code); 533 } else { 534 // VM thread is gone, just exit 535 vm_direct_exit(code); 536 } 537 ShouldNotReachHere(); 538 } 539 540 void notify_vm_shutdown() { 541 // For now, just a dtrace probe. 542 HS_DTRACE_PROBE(hotspot, vm__shutdown); 543 HS_DTRACE_WORKAROUND_TAIL_CALL_BUG(); 544 } 545 546 void vm_direct_exit(int code) { 547 notify_vm_shutdown(); 548 ::exit(code); 549 } 550 551 void vm_perform_shutdown_actions() { 552 // Warning: do not call 'exit_globals()' here. All threads are still running. 553 // Calling 'exit_globals()' will disable thread-local-storage and cause all 554 // kinds of assertions to trigger in debug mode. 555 if (is_init_completed()) { 556 Thread* thread = ThreadLocalStorage::is_initialized() ? 557 ThreadLocalStorage::get_thread_slow() : NULL; 558 if (thread != NULL && thread->is_Java_thread()) { 559 // We are leaving the VM, set state to native (in case any OS exit 560 // handlers call back to the VM) 561 JavaThread* jt = (JavaThread*)thread; 562 // Must always be walkable or have no last_Java_frame when in 563 // thread_in_native 564 jt->frame_anchor()->make_walkable(jt); 565 jt->set_thread_state(_thread_in_native); 566 } 567 } 568 notify_vm_shutdown(); 569 } 570 571 void vm_shutdown() 572 { 573 vm_perform_shutdown_actions(); 574 os::shutdown(); 575 } 576 577 void vm_abort(bool dump_core) { 578 vm_perform_shutdown_actions(); 579 os::abort(dump_core); 580 ShouldNotReachHere(); 581 } 582 583 void vm_notify_during_shutdown(const char* error, const char* message) { 584 if (error != NULL) { 585 tty->print_cr("Error occurred during initialization of VM"); 586 tty->print("%s", error); 587 if (message != NULL) { 588 tty->print_cr(": %s", message); 589 } 590 else { 591 tty->cr(); 592 } 593 } 594 if (ShowMessageBoxOnError && WizardMode) { 595 fatal("Error occurred during initialization of VM"); 596 } 597 } 598 599 void vm_exit_during_initialization(Handle exception) { 600 tty->print_cr("Error occurred during initialization of VM"); 601 // If there are exceptions on this thread it must be cleared 602 // first and here. Any future calls to EXCEPTION_MARK requires 603 // that no pending exceptions exist. 604 Thread *THREAD = Thread::current(); 605 if (HAS_PENDING_EXCEPTION) { 606 CLEAR_PENDING_EXCEPTION; 607 } 608 java_lang_Throwable::print(exception, tty); 609 tty->cr(); 610 java_lang_Throwable::print_stack_trace(exception(), tty); 611 tty->cr(); 612 vm_notify_during_shutdown(NULL, NULL); 613 614 // Failure during initialization, we don't want to dump core 615 vm_abort(false); 616 } 617 618 void vm_exit_during_initialization(Symbol* ex, const char* message) { 619 ResourceMark rm; 620 vm_notify_during_shutdown(ex->as_C_string(), message); 621 622 // Failure during initialization, we don't want to dump core 623 vm_abort(false); 624 } 625 626 void vm_exit_during_initialization(const char* error, const char* message) { 627 vm_notify_during_shutdown(error, message); 628 629 // Failure during initialization, we don't want to dump core 630 vm_abort(false); 631 } 632 633 void vm_shutdown_during_initialization(const char* error, const char* message) { 634 vm_notify_during_shutdown(error, message); 635 vm_shutdown(); 636 } 637 638 JDK_Version JDK_Version::_current; 639 640 void JDK_Version::initialize() { 641 jdk_version_info info; 642 assert(!_current.is_valid(), "Don't initialize twice"); 643 644 void *lib_handle = os::native_java_library(); 645 jdk_version_info_fn_t func = CAST_TO_FN_PTR(jdk_version_info_fn_t, 646 os::dll_lookup(lib_handle, "JDK_GetVersionInfo0")); 647 648 if (func == NULL) { 649 // JDK older than 1.6 650 _current._partially_initialized = true; 651 } else { 652 (*func)(&info, sizeof(info)); 653 654 int major = JDK_VERSION_MAJOR(info.jdk_version); 655 int minor = JDK_VERSION_MINOR(info.jdk_version); 656 int micro = JDK_VERSION_MICRO(info.jdk_version); 657 int build = JDK_VERSION_BUILD(info.jdk_version); 658 if (major == 1 && minor > 4) { 659 // We represent "1.5.0" as "5.0", but 1.4.2 as itself. 660 major = minor; 661 minor = micro; 662 micro = 0; 663 } 664 _current = JDK_Version(major, minor, micro, info.update_version, 665 info.special_update_version, build, 666 info.thread_park_blocker == 1, 667 info.post_vm_init_hook_enabled == 1); 668 } 669 } 670 671 void JDK_Version::fully_initialize( 672 uint8_t major, uint8_t minor, uint8_t micro, uint8_t update) { 673 // This is only called when current is less than 1.6 and we've gotten 674 // far enough in the initialization to determine the exact version. 675 assert(major < 6, "not needed for JDK version >= 6"); 676 assert(is_partially_initialized(), "must not initialize"); 677 if (major < 5) { 678 // JDK verison sequence: 1.2.x, 1.3.x, 1.4.x, 5.0.x, 6.0.x, etc. 679 micro = minor; 680 minor = major; 681 major = 1; 682 } 683 _current = JDK_Version(major, minor, micro, update); 684 } 685 686 void JDK_Version_init() { 687 JDK_Version::initialize(); 688 } 689 690 static int64_t encode_jdk_version(const JDK_Version& v) { 691 return 692 ((int64_t)v.major_version() << (BitsPerByte * 5)) | 693 ((int64_t)v.minor_version() << (BitsPerByte * 4)) | 694 ((int64_t)v.micro_version() << (BitsPerByte * 3)) | 695 ((int64_t)v.update_version() << (BitsPerByte * 2)) | 696 ((int64_t)v.special_update_version() << (BitsPerByte * 1)) | 697 ((int64_t)v.build_number() << (BitsPerByte * 0)); 698 } 699 700 int JDK_Version::compare(const JDK_Version& other) const { 701 assert(is_valid() && other.is_valid(), "Invalid version (uninitialized?)"); 702 if (!is_partially_initialized() && other.is_partially_initialized()) { 703 return -(other.compare(*this)); // flip the comparators 704 } 705 assert(!other.is_partially_initialized(), "Not initialized yet"); 706 if (is_partially_initialized()) { 707 assert(other.major_version() >= 6, 708 "Invalid JDK version comparison during initialization"); 709 return -1; 710 } else { 711 uint64_t e = encode_jdk_version(*this); 712 uint64_t o = encode_jdk_version(other); 713 return (e > o) ? 1 : ((e == o) ? 0 : -1); 714 } 715 } 716 717 void JDK_Version::to_string(char* buffer, size_t buflen) const { 718 size_t index = 0; 719 if (!is_valid()) { 720 jio_snprintf(buffer, buflen, "%s", "(uninitialized)"); 721 } else if (is_partially_initialized()) { 722 jio_snprintf(buffer, buflen, "%s", "(uninitialized) pre-1.6.0"); 723 } else { 724 index += jio_snprintf( 725 &buffer[index], buflen - index, "%d.%d", _major, _minor); 726 if (_micro > 0) { 727 index += jio_snprintf(&buffer[index], buflen - index, ".%d", _micro); 728 } 729 if (_update > 0) { 730 index += jio_snprintf(&buffer[index], buflen - index, "_%02d", _update); 731 } 732 if (_special > 0) { 733 index += jio_snprintf(&buffer[index], buflen - index, "%c", _special); 734 } 735 if (_build > 0) { 736 index += jio_snprintf(&buffer[index], buflen - index, "-b%02d", _build); 737 } 738 } 739 }