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 "jvm.h" 27 #include "aot/aotLoader.hpp" 28 #include "classfile/classLoader.hpp" 29 #include "classfile/stringTable.hpp" 30 #include "classfile/systemDictionary.hpp" 31 #include "code/codeCache.hpp" 32 #include "compiler/compileBroker.hpp" 33 #include "compiler/compilerOracle.hpp" 34 #include "gc/shared/genCollectedHeap.hpp" 35 #include "interpreter/bytecodeHistogram.hpp" 36 #if INCLUDE_JVMCI 37 #include "jvmci/jvmciCompiler.hpp" 38 #include "jvmci/jvmciRuntime.hpp" 39 #endif 40 #include "logging/log.hpp" 41 #include "logging/logStream.hpp" 42 #include "memory/oopFactory.hpp" 43 #include "memory/resourceArea.hpp" 44 #include "memory/universe.hpp" 45 #include "oops/constantPool.hpp" 46 #include "oops/generateOopMap.hpp" 47 #include "oops/instanceKlass.hpp" 48 #include "oops/instanceOop.hpp" 49 #include "oops/method.hpp" 50 #include "oops/objArrayOop.hpp" 51 #include "oops/oop.inline.hpp" 52 #include "oops/symbol.hpp" 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/init.hpp" 59 #include "runtime/interfaceSupport.hpp" 60 #include "runtime/java.hpp" 61 #include "runtime/memprofiler.hpp" 62 #include "runtime/sharedRuntime.hpp" 63 #include "runtime/statSampler.hpp" 64 #include "runtime/sweeper.hpp" 65 #include "runtime/task.hpp" 66 #include "runtime/thread.inline.hpp" 67 #include "runtime/timer.hpp" 68 #include "runtime/vm_operations.hpp" 69 #include "services/memTracker.hpp" 70 #include "trace/traceMacros.hpp" 71 #include "trace/tracing.hpp" 72 #include "utilities/dtrace.hpp" 73 #include "utilities/globalDefinitions.hpp" 74 #include "utilities/histogram.hpp" 75 #include "utilities/macros.hpp" 76 #include "utilities/vmError.hpp" 77 #if INCLUDE_ALL_GCS 78 #include "gc/cms/concurrentMarkSweepThread.hpp" 79 #include "gc/parallel/psScavenge.hpp" 80 #endif // INCLUDE_ALL_GCS 81 #ifdef COMPILER1 82 #include "c1/c1_Compiler.hpp" 83 #include "c1/c1_Runtime1.hpp" 84 #endif 85 #ifdef COMPILER2 86 #include "code/compiledIC.hpp" 87 #include "compiler/methodLiveness.hpp" 88 #include "opto/compile.hpp" 89 #include "opto/indexSet.hpp" 90 #include "opto/runtime.hpp" 91 #endif 92 93 GrowableArray<Method*>* collected_profiled_methods; 94 95 int compare_methods(Method** a, Method** b) { 96 // %%% there can be 32-bit overflow here 97 return ((*b)->invocation_count() + (*b)->compiled_invocation_count()) 98 - ((*a)->invocation_count() + (*a)->compiled_invocation_count()); 99 } 100 101 void collect_profiled_methods(Method* m) { 102 Thread* thread = Thread::current(); 103 methodHandle mh(thread, m); 104 if ((m->method_data() != NULL) && 105 (PrintMethodData || CompilerOracle::should_print(mh))) { 106 collected_profiled_methods->push(m); 107 } 108 } 109 110 void print_method_profiling_data() { 111 if (ProfileInterpreter COMPILER1_PRESENT(|| C1UpdateMethodData) && 112 (PrintMethodData || CompilerOracle::should_print_methods())) { 113 ResourceMark rm; 114 HandleMark hm; 115 collected_profiled_methods = new GrowableArray<Method*>(1024); 116 SystemDictionary::methods_do(collect_profiled_methods); 117 collected_profiled_methods->sort(&compare_methods); 118 119 int count = collected_profiled_methods->length(); 120 int total_size = 0; 121 if (count > 0) { 122 for (int index = 0; index < count; index++) { 123 Method* m = collected_profiled_methods->at(index); 124 ttyLocker ttyl; 125 tty->print_cr("------------------------------------------------------------------------"); 126 m->print_invocation_count(); 127 tty->print_cr(" mdo size: %d bytes", m->method_data()->size_in_bytes()); 128 tty->cr(); 129 // Dump data on parameters if any 130 if (m->method_data() != NULL && m->method_data()->parameters_type_data() != NULL) { 131 tty->fill_to(2); 132 m->method_data()->parameters_type_data()->print_data_on(tty); 133 } 134 m->print_codes(); 135 total_size += m->method_data()->size_in_bytes(); 136 } 137 tty->print_cr("------------------------------------------------------------------------"); 138 tty->print_cr("Total MDO size: %d bytes", total_size); 139 } 140 } 141 } 142 143 144 #ifndef PRODUCT 145 146 // Statistics printing (method invocation histogram) 147 148 GrowableArray<Method*>* collected_invoked_methods; 149 150 void collect_invoked_methods(Method* m) { 151 if (m->invocation_count() + m->compiled_invocation_count() >= 1 ) { 152 collected_invoked_methods->push(m); 153 } 154 } 155 156 157 158 159 void print_method_invocation_histogram() { 160 ResourceMark rm; 161 HandleMark hm; 162 collected_invoked_methods = new GrowableArray<Method*>(1024); 163 SystemDictionary::methods_do(collect_invoked_methods); 164 collected_invoked_methods->sort(&compare_methods); 165 // 166 tty->cr(); 167 tty->print_cr("Histogram Over Method Invocation Counters (cutoff = " INTX_FORMAT "):", MethodHistogramCutoff); 168 tty->cr(); 169 tty->print_cr("____Count_(I+C)____Method________________________Module_________________"); 170 unsigned total = 0, int_total = 0, comp_total = 0, static_total = 0, final_total = 0, 171 synch_total = 0, nativ_total = 0, acces_total = 0; 172 for (int index = 0; index < collected_invoked_methods->length(); index++) { 173 Method* m = collected_invoked_methods->at(index); 174 int c = m->invocation_count() + m->compiled_invocation_count(); 175 if (c >= MethodHistogramCutoff) m->print_invocation_count(); 176 int_total += m->invocation_count(); 177 comp_total += m->compiled_invocation_count(); 178 if (m->is_final()) final_total += c; 179 if (m->is_static()) static_total += c; 180 if (m->is_synchronized()) synch_total += c; 181 if (m->is_native()) nativ_total += c; 182 if (m->is_accessor()) acces_total += c; 183 } 184 tty->cr(); 185 total = int_total + comp_total; 186 tty->print_cr("Invocations summary:"); 187 tty->print_cr("\t%9d (%4.1f%%) interpreted", int_total, 100.0 * int_total / total); 188 tty->print_cr("\t%9d (%4.1f%%) compiled", comp_total, 100.0 * comp_total / total); 189 tty->print_cr("\t%9d (100%%) total", total); 190 tty->print_cr("\t%9d (%4.1f%%) synchronized", synch_total, 100.0 * synch_total / total); 191 tty->print_cr("\t%9d (%4.1f%%) final", final_total, 100.0 * final_total / total); 192 tty->print_cr("\t%9d (%4.1f%%) static", static_total, 100.0 * static_total / total); 193 tty->print_cr("\t%9d (%4.1f%%) native", nativ_total, 100.0 * nativ_total / total); 194 tty->print_cr("\t%9d (%4.1f%%) accessor", acces_total, 100.0 * acces_total / total); 195 tty->cr(); 196 SharedRuntime::print_call_statistics(comp_total); 197 } 198 199 void print_bytecode_count() { 200 if (CountBytecodes || TraceBytecodes || StopInterpreterAt) { 201 tty->print_cr("[BytecodeCounter::counter_value = %d]", BytecodeCounter::counter_value()); 202 } 203 } 204 205 AllocStats alloc_stats; 206 207 208 209 // General statistics printing (profiling ...) 210 void print_statistics() { 211 #ifdef ASSERT 212 213 if (CountRuntimeCalls) { 214 extern Histogram *RuntimeHistogram; 215 RuntimeHistogram->print(); 216 } 217 218 if (CountJNICalls) { 219 extern Histogram *JNIHistogram; 220 JNIHistogram->print(); 221 } 222 223 if (CountJVMCalls) { 224 extern Histogram *JVMHistogram; 225 JVMHistogram->print(); 226 } 227 228 #endif 229 230 if (MemProfiling) { 231 MemProfiler::disengage(); 232 } 233 234 if (CITime) { 235 CompileBroker::print_times(); 236 } 237 238 // 8198691: CodeHeap State Analytics. 239 if (PrintCodeHeapState) { 240 CompileBroker::print_heapinfo(NULL, "all", "4096"); // details 241 } 242 243 #ifdef COMPILER1 244 if ((PrintC1Statistics || LogVMOutput || LogCompilation) && UseCompiler) { 245 FlagSetting fs(DisplayVMOutput, DisplayVMOutput && PrintC1Statistics); 246 Runtime1::print_statistics(); 247 Deoptimization::print_statistics(); 248 SharedRuntime::print_statistics(); 249 } 250 #endif /* COMPILER1 */ 251 252 #ifdef COMPILER2 253 if ((PrintOptoStatistics || LogVMOutput || LogCompilation) && UseCompiler) { 254 FlagSetting fs(DisplayVMOutput, DisplayVMOutput && PrintOptoStatistics); 255 Compile::print_statistics(); 256 #ifndef COMPILER1 257 Deoptimization::print_statistics(); 258 SharedRuntime::print_statistics(); 259 #endif //COMPILER1 260 os::print_statistics(); 261 } 262 263 if (PrintLockStatistics || PrintPreciseBiasedLockingStatistics || PrintPreciseRTMLockingStatistics) { 264 OptoRuntime::print_named_counters(); 265 } 266 267 if (TimeLivenessAnalysis) { 268 MethodLiveness::print_times(); 269 } 270 #ifdef ASSERT 271 if (CollectIndexSetStatistics) { 272 IndexSet::print_statistics(); 273 } 274 #endif // ASSERT 275 #else 276 #ifdef INCLUDE_JVMCI 277 #ifndef COMPILER1 278 if ((TraceDeoptimization || LogVMOutput || LogCompilation) && UseCompiler) { 279 FlagSetting fs(DisplayVMOutput, DisplayVMOutput && TraceDeoptimization); 280 Deoptimization::print_statistics(); 281 SharedRuntime::print_statistics(); 282 } 283 #endif 284 #endif 285 #endif 286 287 if (PrintAOTStatistics) { 288 AOTLoader::print_statistics(); 289 } 290 291 if (PrintNMethodStatistics) { 292 nmethod::print_statistics(); 293 } 294 if (CountCompiledCalls) { 295 print_method_invocation_histogram(); 296 } 297 298 print_method_profiling_data(); 299 300 if (TimeCompilationPolicy) { 301 CompilationPolicy::policy()->print_time(); 302 } 303 if (TimeOopMap) { 304 GenerateOopMap::print_time(); 305 } 306 if (ProfilerCheckIntervals) { 307 PeriodicTask::print_intervals(); 308 } 309 if (PrintSymbolTableSizeHistogram) { 310 SymbolTable::print_histogram(); 311 } 312 if (CountBytecodes || TraceBytecodes || StopInterpreterAt) { 313 BytecodeCounter::print(); 314 } 315 if (PrintBytecodePairHistogram) { 316 BytecodePairHistogram::print(); 317 } 318 319 if (PrintCodeCache) { 320 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 321 CodeCache::print(); 322 } 323 324 if (PrintMethodFlushingStatistics && !PrintCodeHeapState) { 325 NMethodSweeper::print(tty); 326 } 327 328 if (PrintCodeCache2) { 329 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 330 CodeCache::print_internals(); 331 } 332 333 if (PrintVtableStats) { 334 klassVtable::print_statistics(); 335 klassItable::print_statistics(); 336 } 337 if (VerifyOops) { 338 tty->print_cr("+VerifyOops count: %d", StubRoutines::verify_oop_count()); 339 } 340 341 print_bytecode_count(); 342 if (PrintMallocStatistics) { 343 tty->print("allocation stats: "); 344 alloc_stats.print(); 345 tty->cr(); 346 } 347 348 if (PrintSystemDictionaryAtExit) { 349 SystemDictionary::print(); 350 } 351 352 if (LogTouchedMethods && PrintTouchedMethodsAtExit) { 353 Method::print_touched_methods(tty); 354 } 355 356 if (PrintBiasedLockingStatistics) { 357 BiasedLocking::print_counters(); 358 } 359 360 // Native memory tracking data 361 if (PrintNMTStatistics) { 362 MemTracker::final_report(tty); 363 } 364 365 ThreadsSMRSupport::log_statistics(); 366 } 367 368 #else // PRODUCT MODE STATISTICS 369 370 void print_statistics() { 371 372 if (PrintMethodData) { 373 print_method_profiling_data(); 374 } 375 376 if (CITime) { 377 CompileBroker::print_times(); 378 } 379 380 if (PrintCodeCache) { 381 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 382 CodeCache::print(); 383 } 384 385 if (PrintMethodFlushingStatistics && !PrintCodeHeapState) { 386 NMethodSweeper::print(tty); 387 } 388 389 // 8198691: CodeHeap State Analytics. 390 if (PrintCodeHeapState) { 391 CompileBroker::print_heapinfo(NULL, "all", "4096"); // details 392 } 393 394 #ifdef COMPILER2 395 if (PrintPreciseBiasedLockingStatistics || PrintPreciseRTMLockingStatistics) { 396 OptoRuntime::print_named_counters(); 397 } 398 #endif 399 if (PrintBiasedLockingStatistics) { 400 BiasedLocking::print_counters(); 401 } 402 403 // Native memory tracking data 404 if (PrintNMTStatistics) { 405 MemTracker::final_report(tty); 406 } 407 408 if (LogTouchedMethods && PrintTouchedMethodsAtExit) { 409 Method::print_touched_methods(tty); 410 } 411 412 ThreadsSMRSupport::log_statistics(); 413 } 414 415 #endif 416 417 // Note: before_exit() can be executed only once, if more than one threads 418 // are trying to shutdown the VM at the same time, only one thread 419 // can run before_exit() and all other threads must wait. 420 void before_exit(JavaThread* thread) { 421 #define BEFORE_EXIT_NOT_RUN 0 422 #define BEFORE_EXIT_RUNNING 1 423 #define BEFORE_EXIT_DONE 2 424 static jint volatile _before_exit_status = BEFORE_EXIT_NOT_RUN; 425 426 // Note: don't use a Mutex to guard the entire before_exit(), as 427 // JVMTI post_thread_end_event and post_vm_death_event will run native code. 428 // A CAS or OSMutex would work just fine but then we need to manipulate 429 // thread state for Safepoint. Here we use Monitor wait() and notify_all() 430 // for synchronization. 431 { MutexLocker ml(BeforeExit_lock); 432 switch (_before_exit_status) { 433 case BEFORE_EXIT_NOT_RUN: 434 _before_exit_status = BEFORE_EXIT_RUNNING; 435 break; 436 case BEFORE_EXIT_RUNNING: 437 while (_before_exit_status == BEFORE_EXIT_RUNNING) { 438 BeforeExit_lock->wait(); 439 } 440 assert(_before_exit_status == BEFORE_EXIT_DONE, "invalid state"); 441 return; 442 case BEFORE_EXIT_DONE: 443 // need block to avoid SS compiler bug 444 { 445 return; 446 } 447 } 448 } 449 450 #if INCLUDE_JVMCI 451 // We are not using CATCH here because we want the exit to continue normally. 452 Thread* THREAD = thread; 453 JVMCIRuntime::shutdown(THREAD); 454 if (HAS_PENDING_EXCEPTION) { 455 HandleMark hm(THREAD); 456 Handle exception(THREAD, PENDING_EXCEPTION); 457 CLEAR_PENDING_EXCEPTION; 458 java_lang_Throwable::java_printStackTrace(exception, THREAD); 459 } 460 #endif 461 462 // Hang forever on exit if we're reporting an error. 463 if (ShowMessageBoxOnError && VMError::is_error_reported()) { 464 os::infinite_sleep(); 465 } 466 467 EventThreadEnd event; 468 if (event.should_commit()) { 469 event.set_thread(THREAD_TRACE_ID(thread)); 470 event.commit(); 471 } 472 473 TRACE_VM_EXIT(); 474 475 // Stop the WatcherThread. We do this before disenrolling various 476 // PeriodicTasks to reduce the likelihood of races. 477 if (PeriodicTask::num_tasks() > 0) { 478 WatcherThread::stop(); 479 } 480 481 // shut down the StatSampler task 482 StatSampler::disengage(); 483 StatSampler::destroy(); 484 485 // Stop concurrent GC threads 486 Universe::heap()->stop(); 487 488 // Print GC/heap related information. 489 Log(gc, heap, exit) log; 490 if (log.is_info()) { 491 ResourceMark rm; 492 LogStream ls_info(log.info()); 493 Universe::print_on(&ls_info); 494 if (log.is_trace()) { 495 LogStream ls_trace(log.trace()); 496 ClassLoaderDataGraph::dump_on(&ls_trace); 497 } 498 } 499 500 if (PrintBytecodeHistogram) { 501 BytecodeHistogram::print(); 502 } 503 504 if (JvmtiExport::should_post_thread_life()) { 505 JvmtiExport::post_thread_end(thread); 506 } 507 508 // Always call even when there are not JVMTI environments yet, since environments 509 // may be attached late and JVMTI must track phases of VM execution 510 JvmtiExport::post_vm_death(); 511 Threads::shutdown_vm_agents(); 512 513 // Terminate the signal thread 514 // Note: we don't wait until it actually dies. 515 os::terminate_signal_thread(); 516 517 print_statistics(); 518 Universe::heap()->print_tracing_info(); 519 520 { MutexLocker ml(BeforeExit_lock); 521 _before_exit_status = BEFORE_EXIT_DONE; 522 BeforeExit_lock->notify_all(); 523 } 524 525 if (VerifyStringTableAtExit) { 526 int fail_cnt = 0; 527 { 528 MutexLocker ml(StringTable_lock); 529 fail_cnt = StringTable::verify_and_compare_entries(); 530 } 531 532 if (fail_cnt != 0) { 533 tty->print_cr("ERROR: fail_cnt=%d", fail_cnt); 534 guarantee(fail_cnt == 0, "unexpected StringTable verification failures"); 535 } 536 } 537 538 #undef BEFORE_EXIT_NOT_RUN 539 #undef BEFORE_EXIT_RUNNING 540 #undef BEFORE_EXIT_DONE 541 } 542 543 void vm_exit(int code) { 544 Thread* thread = 545 ThreadLocalStorage::is_initialized() ? Thread::current_or_null() : NULL; 546 if (thread == NULL) { 547 // very early initialization failure -- just exit 548 vm_direct_exit(code); 549 } 550 551 if (VMThread::vm_thread() != NULL) { 552 // Fire off a VM_Exit operation to bring VM to a safepoint and exit 553 VM_Exit op(code); 554 if (thread->is_Java_thread()) 555 ((JavaThread*)thread)->set_thread_state(_thread_in_vm); 556 VMThread::execute(&op); 557 // should never reach here; but in case something wrong with VM Thread. 558 vm_direct_exit(code); 559 } else { 560 // VM thread is gone, just exit 561 vm_direct_exit(code); 562 } 563 ShouldNotReachHere(); 564 } 565 566 void notify_vm_shutdown() { 567 // For now, just a dtrace probe. 568 HOTSPOT_VM_SHUTDOWN(); 569 HS_DTRACE_WORKAROUND_TAIL_CALL_BUG(); 570 } 571 572 void vm_direct_exit(int code) { 573 notify_vm_shutdown(); 574 os::wait_for_keypress_at_exit(); 575 os::exit(code); 576 } 577 578 void vm_perform_shutdown_actions() { 579 // Warning: do not call 'exit_globals()' here. All threads are still running. 580 // Calling 'exit_globals()' will disable thread-local-storage and cause all 581 // kinds of assertions to trigger in debug mode. 582 if (is_init_completed()) { 583 Thread* thread = Thread::current_or_null(); 584 if (thread != NULL && thread->is_Java_thread()) { 585 // We are leaving the VM, set state to native (in case any OS exit 586 // handlers call back to the VM) 587 JavaThread* jt = (JavaThread*)thread; 588 // Must always be walkable or have no last_Java_frame when in 589 // thread_in_native 590 jt->frame_anchor()->make_walkable(jt); 591 jt->set_thread_state(_thread_in_native); 592 } 593 } 594 notify_vm_shutdown(); 595 } 596 597 void vm_shutdown() 598 { 599 vm_perform_shutdown_actions(); 600 os::wait_for_keypress_at_exit(); 601 os::shutdown(); 602 } 603 604 void vm_abort(bool dump_core) { 605 vm_perform_shutdown_actions(); 606 os::wait_for_keypress_at_exit(); 607 608 // Flush stdout and stderr before abort. 609 fflush(stdout); 610 fflush(stderr); 611 612 os::abort(dump_core); 613 ShouldNotReachHere(); 614 } 615 616 void vm_notify_during_shutdown(const char* error, const char* message) { 617 if (error != NULL) { 618 tty->print_cr("Error occurred during initialization of VM"); 619 tty->print("%s", error); 620 if (message != NULL) { 621 tty->print_cr(": %s", message); 622 } 623 else { 624 tty->cr(); 625 } 626 } 627 if (ShowMessageBoxOnError && WizardMode) { 628 fatal("Error occurred during initialization of VM"); 629 } 630 } 631 632 void vm_exit_during_initialization() { 633 vm_notify_during_shutdown(NULL, NULL); 634 635 // Failure during initialization, we don't want to dump core 636 vm_abort(false); 637 } 638 639 void vm_exit_during_initialization(Handle exception) { 640 tty->print_cr("Error occurred during initialization of VM"); 641 // If there are exceptions on this thread it must be cleared 642 // first and here. Any future calls to EXCEPTION_MARK requires 643 // that no pending exceptions exist. 644 Thread *THREAD = Thread::current(); // can't be NULL 645 if (HAS_PENDING_EXCEPTION) { 646 CLEAR_PENDING_EXCEPTION; 647 } 648 java_lang_Throwable::print_stack_trace(exception, tty); 649 tty->cr(); 650 vm_notify_during_shutdown(NULL, NULL); 651 652 // Failure during initialization, we don't want to dump core 653 vm_abort(false); 654 } 655 656 void vm_exit_during_initialization(Symbol* ex, const char* message) { 657 ResourceMark rm; 658 vm_notify_during_shutdown(ex->as_C_string(), message); 659 660 // Failure during initialization, we don't want to dump core 661 vm_abort(false); 662 } 663 664 void vm_exit_during_initialization(const char* error, const char* message) { 665 vm_notify_during_shutdown(error, message); 666 667 // Failure during initialization, we don't want to dump core 668 vm_abort(false); 669 } 670 671 void vm_shutdown_during_initialization(const char* error, const char* message) { 672 vm_notify_during_shutdown(error, message); 673 vm_shutdown(); 674 } 675 676 JDK_Version JDK_Version::_current; 677 const char* JDK_Version::_runtime_name; 678 const char* JDK_Version::_runtime_version; 679 680 void JDK_Version::initialize() { 681 jdk_version_info info; 682 assert(!_current.is_valid(), "Don't initialize twice"); 683 684 void *lib_handle = os::native_java_library(); 685 jdk_version_info_fn_t func = CAST_TO_FN_PTR(jdk_version_info_fn_t, 686 os::dll_lookup(lib_handle, "JDK_GetVersionInfo0")); 687 688 assert(func != NULL, "Support for JDK 1.5 or older has been removed after JEP-223"); 689 690 (*func)(&info, sizeof(info)); 691 692 int major = JDK_VERSION_MAJOR(info.jdk_version); 693 int minor = JDK_VERSION_MINOR(info.jdk_version); 694 int security = JDK_VERSION_SECURITY(info.jdk_version); 695 int build = JDK_VERSION_BUILD(info.jdk_version); 696 697 // Incompatible with pre-4243978 JDK. 698 if (info.pending_list_uses_discovered_field == 0) { 699 vm_exit_during_initialization( 700 "Incompatible JDK is not using Reference.discovered field for pending list"); 701 } 702 _current = JDK_Version(major, minor, security, info.patch_version, build, 703 info.thread_park_blocker == 1, 704 info.post_vm_init_hook_enabled == 1); 705 } 706 707 void JDK_Version_init() { 708 JDK_Version::initialize(); 709 } 710 711 static int64_t encode_jdk_version(const JDK_Version& v) { 712 return 713 ((int64_t)v.major_version() << (BitsPerByte * 4)) | 714 ((int64_t)v.minor_version() << (BitsPerByte * 3)) | 715 ((int64_t)v.security_version() << (BitsPerByte * 2)) | 716 ((int64_t)v.patch_version() << (BitsPerByte * 1)) | 717 ((int64_t)v.build_number() << (BitsPerByte * 0)); 718 } 719 720 int JDK_Version::compare(const JDK_Version& other) const { 721 assert(is_valid() && other.is_valid(), "Invalid version (uninitialized?)"); 722 uint64_t e = encode_jdk_version(*this); 723 uint64_t o = encode_jdk_version(other); 724 return (e > o) ? 1 : ((e == o) ? 0 : -1); 725 } 726 727 void JDK_Version::to_string(char* buffer, size_t buflen) const { 728 assert(buffer && buflen > 0, "call with useful buffer"); 729 size_t index = 0; 730 731 if (!is_valid()) { 732 jio_snprintf(buffer, buflen, "%s", "(uninitialized)"); 733 } else { 734 int rc = jio_snprintf( 735 &buffer[index], buflen - index, "%d.%d", _major, _minor); 736 if (rc == -1) return; 737 index += rc; 738 if (_security > 0) { 739 rc = jio_snprintf(&buffer[index], buflen - index, ".%d", _security); 740 if (rc == -1) return; 741 index += rc; 742 } 743 if (_patch > 0) { 744 rc = jio_snprintf(&buffer[index], buflen - index, ".%d", _patch); 745 if (rc == -1) return; 746 index += rc; 747 } 748 if (_build > 0) { 749 rc = jio_snprintf(&buffer[index], buflen - index, "+%d", _build); 750 if (rc == -1) return; 751 index += rc; 752 } 753 } 754 }