1 /* 2 * Copyright (c) 1997, 2018, 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.inline.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 #ifdef COMPILER1 239 if ((PrintC1Statistics || LogVMOutput || LogCompilation) && UseCompiler) { 240 FlagSetting fs(DisplayVMOutput, DisplayVMOutput && PrintC1Statistics); 241 Runtime1::print_statistics(); 242 Deoptimization::print_statistics(); 243 SharedRuntime::print_statistics(); 244 } 245 #endif /* COMPILER1 */ 246 247 #ifdef COMPILER2 248 if ((PrintOptoStatistics || LogVMOutput || LogCompilation) && UseCompiler) { 249 FlagSetting fs(DisplayVMOutput, DisplayVMOutput && PrintOptoStatistics); 250 Compile::print_statistics(); 251 #ifndef COMPILER1 252 Deoptimization::print_statistics(); 253 SharedRuntime::print_statistics(); 254 #endif //COMPILER1 255 os::print_statistics(); 256 } 257 258 if (PrintLockStatistics || PrintPreciseBiasedLockingStatistics || PrintPreciseRTMLockingStatistics) { 259 OptoRuntime::print_named_counters(); 260 } 261 262 if (TimeLivenessAnalysis) { 263 MethodLiveness::print_times(); 264 } 265 #ifdef ASSERT 266 if (CollectIndexSetStatistics) { 267 IndexSet::print_statistics(); 268 } 269 #endif // ASSERT 270 #else 271 #ifdef INCLUDE_JVMCI 272 #ifndef COMPILER1 273 if ((TraceDeoptimization || LogVMOutput || LogCompilation) && UseCompiler) { 274 FlagSetting fs(DisplayVMOutput, DisplayVMOutput && TraceDeoptimization); 275 Deoptimization::print_statistics(); 276 SharedRuntime::print_statistics(); 277 } 278 #endif 279 #endif 280 #endif 281 282 if (PrintAOTStatistics) { 283 AOTLoader::print_statistics(); 284 } 285 286 if (PrintNMethodStatistics) { 287 nmethod::print_statistics(); 288 } 289 if (CountCompiledCalls) { 290 print_method_invocation_histogram(); 291 } 292 293 print_method_profiling_data(); 294 295 if (TimeCompilationPolicy) { 296 CompilationPolicy::policy()->print_time(); 297 } 298 if (TimeOopMap) { 299 GenerateOopMap::print_time(); 300 } 301 if (ProfilerCheckIntervals) { 302 PeriodicTask::print_intervals(); 303 } 304 if (PrintSymbolTableSizeHistogram) { 305 SymbolTable::print_histogram(); 306 } 307 if (CountBytecodes || TraceBytecodes || StopInterpreterAt) { 308 BytecodeCounter::print(); 309 } 310 if (PrintBytecodePairHistogram) { 311 BytecodePairHistogram::print(); 312 } 313 314 if (PrintCodeCache) { 315 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 316 CodeCache::print(); 317 } 318 319 if (PrintMethodFlushingStatistics) { 320 NMethodSweeper::print(tty); 321 } 322 323 // CodeHeap State Analytics. 324 LogTarget(Trace, codecache) lt; 325 if (lt.is_enabled()) { 326 CompileBroker::print_heapinfo(NULL, "all", "4096"); // details 327 } 328 329 if (PrintCodeCache2) { 330 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 331 CodeCache::print_internals(); 332 } 333 334 if (PrintVtableStats) { 335 klassVtable::print_statistics(); 336 klassItable::print_statistics(); 337 } 338 if (VerifyOops) { 339 tty->print_cr("+VerifyOops count: %d", StubRoutines::verify_oop_count()); 340 } 341 342 print_bytecode_count(); 343 if (PrintMallocStatistics) { 344 tty->print("allocation stats: "); 345 alloc_stats.print(); 346 tty->cr(); 347 } 348 349 if (PrintSystemDictionaryAtExit) { 350 ResourceMark rm; 351 SystemDictionary::print(); 352 ClassLoaderDataGraph::print(); 353 } 354 355 if (LogTouchedMethods && PrintTouchedMethodsAtExit) { 356 Method::print_touched_methods(tty); 357 } 358 359 if (PrintBiasedLockingStatistics) { 360 BiasedLocking::print_counters(); 361 } 362 363 // Native memory tracking data 364 if (PrintNMTStatistics) { 365 MemTracker::final_report(tty); 366 } 367 368 ThreadsSMRSupport::log_statistics(); 369 } 370 371 #else // PRODUCT MODE STATISTICS 372 373 void print_statistics() { 374 375 if (PrintMethodData) { 376 print_method_profiling_data(); 377 } 378 379 if (CITime) { 380 CompileBroker::print_times(); 381 } 382 383 if (PrintCodeCache) { 384 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 385 CodeCache::print(); 386 } 387 388 if (PrintMethodFlushingStatistics) { 389 NMethodSweeper::print(tty); 390 } 391 392 // CodeHeap State Analytics. 393 LogTarget(Trace, codecache) lt; 394 if (lt.is_enabled()) { 395 CompileBroker::print_heapinfo(NULL, "all", "4096"); // details 396 } 397 398 #ifdef COMPILER2 399 if (PrintPreciseBiasedLockingStatistics || PrintPreciseRTMLockingStatistics) { 400 OptoRuntime::print_named_counters(); 401 } 402 #endif 403 if (PrintBiasedLockingStatistics) { 404 BiasedLocking::print_counters(); 405 } 406 407 // Native memory tracking data 408 if (PrintNMTStatistics) { 409 MemTracker::final_report(tty); 410 } 411 412 if (LogTouchedMethods && PrintTouchedMethodsAtExit) { 413 Method::print_touched_methods(tty); 414 } 415 416 ThreadsSMRSupport::log_statistics(); 417 } 418 419 #endif 420 421 // Note: before_exit() can be executed only once, if more than one threads 422 // are trying to shutdown the VM at the same time, only one thread 423 // can run before_exit() and all other threads must wait. 424 void before_exit(JavaThread* thread) { 425 #define BEFORE_EXIT_NOT_RUN 0 426 #define BEFORE_EXIT_RUNNING 1 427 #define BEFORE_EXIT_DONE 2 428 static jint volatile _before_exit_status = BEFORE_EXIT_NOT_RUN; 429 430 // Note: don't use a Mutex to guard the entire before_exit(), as 431 // JVMTI post_thread_end_event and post_vm_death_event will run native code. 432 // A CAS or OSMutex would work just fine but then we need to manipulate 433 // thread state for Safepoint. Here we use Monitor wait() and notify_all() 434 // for synchronization. 435 { MutexLocker ml(BeforeExit_lock); 436 switch (_before_exit_status) { 437 case BEFORE_EXIT_NOT_RUN: 438 _before_exit_status = BEFORE_EXIT_RUNNING; 439 break; 440 case BEFORE_EXIT_RUNNING: 441 while (_before_exit_status == BEFORE_EXIT_RUNNING) { 442 BeforeExit_lock->wait(); 443 } 444 assert(_before_exit_status == BEFORE_EXIT_DONE, "invalid state"); 445 return; 446 case BEFORE_EXIT_DONE: 447 // need block to avoid SS compiler bug 448 { 449 return; 450 } 451 } 452 } 453 454 #if INCLUDE_JVMCI 455 // We are not using CATCH here because we want the exit to continue normally. 456 Thread* THREAD = thread; 457 JVMCIRuntime::shutdown(THREAD); 458 if (HAS_PENDING_EXCEPTION) { 459 HandleMark hm(THREAD); 460 Handle exception(THREAD, PENDING_EXCEPTION); 461 CLEAR_PENDING_EXCEPTION; 462 java_lang_Throwable::java_printStackTrace(exception, THREAD); 463 } 464 #endif 465 466 // Hang forever on exit if we're reporting an error. 467 if (ShowMessageBoxOnError && VMError::is_error_reported()) { 468 os::infinite_sleep(); 469 } 470 471 EventThreadEnd event; 472 if (event.should_commit()) { 473 event.set_thread(THREAD_TRACE_ID(thread)); 474 event.commit(); 475 } 476 477 TRACE_VM_EXIT(); 478 479 // Stop the WatcherThread. We do this before disenrolling various 480 // PeriodicTasks to reduce the likelihood of races. 481 if (PeriodicTask::num_tasks() > 0) { 482 WatcherThread::stop(); 483 } 484 485 // shut down the StatSampler task 486 StatSampler::disengage(); 487 StatSampler::destroy(); 488 489 // Stop concurrent GC threads 490 Universe::heap()->stop(); 491 492 // Print GC/heap related information. 493 Log(gc, heap, exit) log; 494 if (log.is_info()) { 495 ResourceMark rm; 496 LogStream ls_info(log.info()); 497 Universe::print_on(&ls_info); 498 if (log.is_trace()) { 499 LogStream ls_trace(log.trace()); 500 ClassLoaderDataGraph::print_on(&ls_trace); 501 } 502 } 503 504 if (PrintBytecodeHistogram) { 505 BytecodeHistogram::print(); 506 } 507 508 if (JvmtiExport::should_post_thread_life()) { 509 JvmtiExport::post_thread_end(thread); 510 } 511 512 // Always call even when there are not JVMTI environments yet, since environments 513 // may be attached late and JVMTI must track phases of VM execution 514 JvmtiExport::post_vm_death(); 515 Threads::shutdown_vm_agents(); 516 517 // Terminate the signal thread 518 // Note: we don't wait until it actually dies. 519 os::terminate_signal_thread(); 520 521 print_statistics(); 522 Universe::heap()->print_tracing_info(); 523 524 { MutexLocker ml(BeforeExit_lock); 525 _before_exit_status = BEFORE_EXIT_DONE; 526 BeforeExit_lock->notify_all(); 527 } 528 529 if (VerifyStringTableAtExit) { 530 int fail_cnt = 0; 531 { 532 MutexLocker ml(StringTable_lock); 533 fail_cnt = StringTable::verify_and_compare_entries(); 534 } 535 536 if (fail_cnt != 0) { 537 tty->print_cr("ERROR: fail_cnt=%d", fail_cnt); 538 guarantee(fail_cnt == 0, "unexpected StringTable verification failures"); 539 } 540 } 541 542 #undef BEFORE_EXIT_NOT_RUN 543 #undef BEFORE_EXIT_RUNNING 544 #undef BEFORE_EXIT_DONE 545 } 546 547 void vm_exit(int code) { 548 Thread* thread = 549 ThreadLocalStorage::is_initialized() ? Thread::current_or_null() : NULL; 550 if (thread == NULL) { 551 // very early initialization failure -- just exit 552 vm_direct_exit(code); 553 } 554 555 if (VMThread::vm_thread() != NULL) { 556 // Fire off a VM_Exit operation to bring VM to a safepoint and exit 557 VM_Exit op(code); 558 if (thread->is_Java_thread()) 559 ((JavaThread*)thread)->set_thread_state(_thread_in_vm); 560 VMThread::execute(&op); 561 // should never reach here; but in case something wrong with VM Thread. 562 vm_direct_exit(code); 563 } else { 564 // VM thread is gone, just exit 565 vm_direct_exit(code); 566 } 567 ShouldNotReachHere(); 568 } 569 570 void notify_vm_shutdown() { 571 // For now, just a dtrace probe. 572 HOTSPOT_VM_SHUTDOWN(); 573 HS_DTRACE_WORKAROUND_TAIL_CALL_BUG(); 574 } 575 576 void vm_direct_exit(int code) { 577 notify_vm_shutdown(); 578 os::wait_for_keypress_at_exit(); 579 os::exit(code); 580 } 581 582 void vm_perform_shutdown_actions() { 583 // Warning: do not call 'exit_globals()' here. All threads are still running. 584 // Calling 'exit_globals()' will disable thread-local-storage and cause all 585 // kinds of assertions to trigger in debug mode. 586 if (is_init_completed()) { 587 Thread* thread = Thread::current_or_null(); 588 if (thread != NULL && thread->is_Java_thread()) { 589 // We are leaving the VM, set state to native (in case any OS exit 590 // handlers call back to the VM) 591 JavaThread* jt = (JavaThread*)thread; 592 // Must always be walkable or have no last_Java_frame when in 593 // thread_in_native 594 jt->frame_anchor()->make_walkable(jt); 595 jt->set_thread_state(_thread_in_native); 596 } 597 } 598 notify_vm_shutdown(); 599 } 600 601 void vm_shutdown() 602 { 603 vm_perform_shutdown_actions(); 604 os::wait_for_keypress_at_exit(); 605 os::shutdown(); 606 } 607 608 void vm_abort(bool dump_core) { 609 vm_perform_shutdown_actions(); 610 os::wait_for_keypress_at_exit(); 611 612 // Flush stdout and stderr before abort. 613 fflush(stdout); 614 fflush(stderr); 615 616 os::abort(dump_core); 617 ShouldNotReachHere(); 618 } 619 620 void vm_notify_during_shutdown(const char* error, const char* message) { 621 if (error != NULL) { 622 tty->print_cr("Error occurred during initialization of VM"); 623 tty->print("%s", error); 624 if (message != NULL) { 625 tty->print_cr(": %s", message); 626 } 627 else { 628 tty->cr(); 629 } 630 } 631 if (ShowMessageBoxOnError && WizardMode) { 632 fatal("Error occurred during initialization of VM"); 633 } 634 } 635 636 void vm_exit_during_initialization() { 637 vm_notify_during_shutdown(NULL, NULL); 638 639 // Failure during initialization, we don't want to dump core 640 vm_abort(false); 641 } 642 643 void vm_exit_during_initialization(Handle exception) { 644 tty->print_cr("Error occurred during initialization of VM"); 645 // If there are exceptions on this thread it must be cleared 646 // first and here. Any future calls to EXCEPTION_MARK requires 647 // that no pending exceptions exist. 648 Thread *THREAD = Thread::current(); // can't be NULL 649 if (HAS_PENDING_EXCEPTION) { 650 CLEAR_PENDING_EXCEPTION; 651 } 652 java_lang_Throwable::print_stack_trace(exception, tty); 653 tty->cr(); 654 vm_notify_during_shutdown(NULL, NULL); 655 656 // Failure during initialization, we don't want to dump core 657 vm_abort(false); 658 } 659 660 void vm_exit_during_initialization(Symbol* ex, const char* message) { 661 ResourceMark rm; 662 vm_notify_during_shutdown(ex->as_C_string(), message); 663 664 // Failure during initialization, we don't want to dump core 665 vm_abort(false); 666 } 667 668 void vm_exit_during_initialization(const char* error, const char* message) { 669 vm_notify_during_shutdown(error, message); 670 671 // Failure during initialization, we don't want to dump core 672 vm_abort(false); 673 } 674 675 void vm_shutdown_during_initialization(const char* error, const char* message) { 676 vm_notify_during_shutdown(error, message); 677 vm_shutdown(); 678 } 679 680 JDK_Version JDK_Version::_current; 681 const char* JDK_Version::_runtime_name; 682 const char* JDK_Version::_runtime_version; 683 684 void JDK_Version::initialize() { 685 jdk_version_info info; 686 assert(!_current.is_valid(), "Don't initialize twice"); 687 688 void *lib_handle = os::native_java_library(); 689 jdk_version_info_fn_t func = CAST_TO_FN_PTR(jdk_version_info_fn_t, 690 os::dll_lookup(lib_handle, "JDK_GetVersionInfo0")); 691 692 assert(func != NULL, "Support for JDK 1.5 or older has been removed after JEP-223"); 693 694 (*func)(&info, sizeof(info)); 695 696 int major = JDK_VERSION_MAJOR(info.jdk_version); 697 int minor = JDK_VERSION_MINOR(info.jdk_version); 698 int security = JDK_VERSION_SECURITY(info.jdk_version); 699 int build = JDK_VERSION_BUILD(info.jdk_version); 700 701 // Incompatible with pre-4243978 JDK. 702 if (info.pending_list_uses_discovered_field == 0) { 703 vm_exit_during_initialization( 704 "Incompatible JDK is not using Reference.discovered field for pending list"); 705 } 706 _current = JDK_Version(major, minor, security, info.patch_version, build, 707 info.thread_park_blocker == 1, 708 info.post_vm_init_hook_enabled == 1); 709 } 710 711 void JDK_Version_init() { 712 JDK_Version::initialize(); 713 } 714 715 static int64_t encode_jdk_version(const JDK_Version& v) { 716 return 717 ((int64_t)v.major_version() << (BitsPerByte * 4)) | 718 ((int64_t)v.minor_version() << (BitsPerByte * 3)) | 719 ((int64_t)v.security_version() << (BitsPerByte * 2)) | 720 ((int64_t)v.patch_version() << (BitsPerByte * 1)) | 721 ((int64_t)v.build_number() << (BitsPerByte * 0)); 722 } 723 724 int JDK_Version::compare(const JDK_Version& other) const { 725 assert(is_valid() && other.is_valid(), "Invalid version (uninitialized?)"); 726 uint64_t e = encode_jdk_version(*this); 727 uint64_t o = encode_jdk_version(other); 728 return (e > o) ? 1 : ((e == o) ? 0 : -1); 729 } 730 731 void JDK_Version::to_string(char* buffer, size_t buflen) const { 732 assert(buffer && buflen > 0, "call with useful buffer"); 733 size_t index = 0; 734 735 if (!is_valid()) { 736 jio_snprintf(buffer, buflen, "%s", "(uninitialized)"); 737 } else { 738 int rc = jio_snprintf( 739 &buffer[index], buflen - index, "%d.%d", _major, _minor); 740 if (rc == -1) return; 741 index += rc; 742 if (_security > 0) { 743 rc = jio_snprintf(&buffer[index], buflen - index, ".%d", _security); 744 if (rc == -1) return; 745 index += rc; 746 } 747 if (_patch > 0) { 748 rc = jio_snprintf(&buffer[index], buflen - index, ".%d", _patch); 749 if (rc == -1) return; 750 index += rc; 751 } 752 if (_build > 0) { 753 rc = jio_snprintf(&buffer[index], buflen - index, "+%d", _build); 754 if (rc == -1) return; 755 index += rc; 756 } 757 } 758 }