jdk8-mips64-public/hotspot: src/share/vm/runtime/java.cpp@72053ed6f8d4 (annotated)

src/share/vm/runtime/java.cpp@72053ed6f8d4 (annotated)

src/share/vm/runtime/java.cpp

Thu, 24 Nov 2016 11:27:57 +0100

author: tschatzl
date: Thu, 24 Nov 2016 11:27:57 +0100
changeset 9982: 72053ed6f8d4
parent 9896: 1b8c45b8216a
child 9931: fd44df5e3bc3
permissions: -rw-r--r--

8057003: Large reference arrays cause extremely long synchronization times
Summary: Slice large object arrays into parts so that the synchronization of marking threads with an STW pause request does not take long.
Reviewed-by: ehelin, pliden
Contributed-by: maoliang.ml@alibaba-inc.com

 /*
  * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #include "precompiled.hpp"
 #include "classfile/classLoader.hpp"
 #include "classfile/symbolTable.hpp"
 #include "classfile/systemDictionary.hpp"
 #include "code/codeCache.hpp"
 #include "compiler/compileBroker.hpp"
 #include "compiler/compilerOracle.hpp"
 #include "interpreter/bytecodeHistogram.hpp"
 #include "jfr/jfrEvents.hpp"
 #include "jfr/support/jfrThreadId.hpp"
 #include "memory/genCollectedHeap.hpp"
 #include "memory/oopFactory.hpp"
 #include "memory/universe.hpp"
 #include "oops/constantPool.hpp"
 #include "oops/generateOopMap.hpp"
 #include "oops/instanceKlass.hpp"
 #include "oops/instanceOop.hpp"
 #include "oops/method.hpp"
 #include "oops/objArrayOop.hpp"
 #include "oops/oop.inline.hpp"
 #include "oops/symbol.hpp"
 #include "prims/jvmtiExport.hpp"
 #include "runtime/arguments.hpp"
 #include "runtime/biasedLocking.hpp"
 #include "runtime/compilationPolicy.hpp"
 #include "runtime/deoptimization.hpp"
 #include "runtime/fprofiler.hpp"
 #include "runtime/init.hpp"
 #include "runtime/interfaceSupport.hpp"
 #include "runtime/java.hpp"
 #include "runtime/memprofiler.hpp"
 #include "runtime/sharedRuntime.hpp"
 #include "runtime/statSampler.hpp"
 #include "runtime/sweeper.hpp"
 #include "runtime/task.hpp"
 #include "runtime/thread.inline.hpp"
 #include "runtime/timer.hpp"
 #include "runtime/vm_operations.hpp"
 #include "services/memTracker.hpp"
 #include "utilities/dtrace.hpp"
 #include "utilities/globalDefinitions.hpp"
 #include "utilities/histogram.hpp"
 #include "utilities/macros.hpp"
 #include "utilities/vmError.hpp"
 #ifdef TARGET_ARCH_x86
 # include "vm_version_x86.hpp"
 #endif
 #ifdef TARGET_ARCH_sparc
 # include "vm_version_sparc.hpp"
 #endif
 #ifdef TARGET_ARCH_zero
 # include "vm_version_zero.hpp"
 #endif
 #ifdef TARGET_ARCH_arm
 # include "vm_version_arm.hpp"
 #endif
 #ifdef TARGET_ARCH_ppc
 # include "vm_version_ppc.hpp"
 #endif
 #if INCLUDE_ALL_GCS
 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp"
 #include "gc_implementation/parallelScavenge/psScavenge.hpp"
 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp"
 #endif // INCLUDE_ALL_GCS
 #ifdef COMPILER1
 #include "c1/c1_Compiler.hpp"
 #include "c1/c1_Runtime1.hpp"
 #endif
 #ifdef COMPILER2
 #include "code/compiledIC.hpp"
 #include "compiler/methodLiveness.hpp"
 #include "opto/compile.hpp"
 #include "opto/indexSet.hpp"
 #include "opto/runtime.hpp"
 #endif
 #if INCLUDE_JFR
 #include "jfr/jfr.hpp"
 #endif
 #ifndef USDT2
 HS_DTRACE_PROBE_DECL(hotspot, vm__shutdown);
 #endif /* !USDT2 */
 #ifndef PRODUCT
 // Statistics printing (method invocation histogram)
 GrowableArray<Method*>* collected_invoked_methods;
 void collect_invoked_methods(Method* m) {
   if (m->invocation_count() + m->compiled_invocation_count() >= 1 ) {
     collected_invoked_methods->push(m);
   }
 }
 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
 GrowableArray<Method*>* collected_profiled_methods;
 void collect_profiled_methods(Method* m) {
   Thread* thread = Thread::current();
   // This HandleMark prevents a huge amount of handles from being added
   // to the metadata_handles() array on the thread.
   HandleMark hm(thread);
   methodHandle mh(thread, m);
   if ((m->method_data() != NULL) &&
       (PrintMethodData || CompilerOracle::should_print(mh))) {
     collected_profiled_methods->push(m);
   }
 }
 int compare_methods(Method** a, Method** b) {
   // %%% there can be 32-bit overflow here
   return ((*b)->invocation_count() + (*b)->compiled_invocation_count())
        - ((*a)->invocation_count() + (*a)->compiled_invocation_count());
 }
 void print_method_invocation_histogram() {
   ResourceMark rm;
   HandleMark hm;
   collected_invoked_methods = new GrowableArray<Method*>(1024);
   SystemDictionary::methods_do(collect_invoked_methods);
   collected_invoked_methods->sort(&compare_methods);
   //
   tty->cr();
   tty->print_cr("Histogram Over MethodOop Invocation Counters (cutoff = %d):", MethodHistogramCutoff);
   tty->cr();
   tty->print_cr("____Count_(I+C)____Method________________________Module_________________");
   unsigned total = 0, int_total = 0, comp_total = 0, static_total = 0, final_total = 0,
       synch_total = 0, nativ_total = 0, acces_total = 0;
   for (int index = 0; index < collected_invoked_methods->length(); index++) {
     Method* m = collected_invoked_methods->at(index);
     int c = m->invocation_count() + m->compiled_invocation_count();
     if (c >= MethodHistogramCutoff) m->print_invocation_count();
     int_total  += m->invocation_count();
     comp_total += m->compiled_invocation_count();
     if (m->is_final())        final_total  += c;
     if (m->is_static())       static_total += c;
     if (m->is_synchronized()) synch_total  += c;
     if (m->is_native())       nativ_total  += c;
     if (m->is_accessor())     acces_total  += c;
   }
   tty->cr();
   total = int_total + comp_total;
   tty->print_cr("Invocations summary:");
   tty->print_cr("\t%9d (%4.1f%%) interpreted",  int_total,    100.0 * int_total    / total);
   tty->print_cr("\t%9d (%4.1f%%) compiled",     comp_total,   100.0 * comp_total   / total);
   tty->print_cr("\t%9d (100%%)  total",         total);
   tty->print_cr("\t%9d (%4.1f%%) synchronized", synch_total,  100.0 * synch_total  / total);
   tty->print_cr("\t%9d (%4.1f%%) final",        final_total,  100.0 * final_total  / total);
   tty->print_cr("\t%9d (%4.1f%%) static",       static_total, 100.0 * static_total / total);
   tty->print_cr("\t%9d (%4.1f%%) native",       nativ_total,  100.0 * nativ_total  / total);
   tty->print_cr("\t%9d (%4.1f%%) accessor",     acces_total,  100.0 * acces_total  / total);
   tty->cr();
   SharedRuntime::print_call_statistics(comp_total);
 }
 void print_method_profiling_data() {
   ResourceMark rm;
   HandleMark hm;
   collected_profiled_methods = new GrowableArray<Method*>(1024);
   SystemDictionary::methods_do(collect_profiled_methods);
   collected_profiled_methods->sort(&compare_methods);
   int count = collected_profiled_methods->length();
   int total_size = 0;
   if (count > 0) {
     for (int index = 0; index < count; index++) {
       Method* m = collected_profiled_methods->at(index);
       ttyLocker ttyl;
       tty->print_cr("------------------------------------------------------------------------");
       //m->print_name(tty);
       m->print_invocation_count();
       tty->print_cr("  mdo size: %d bytes", m->method_data()->size_in_bytes());
       tty->cr();
       // Dump data on parameters if any
       if (m->method_data() != NULL && m->method_data()->parameters_type_data() != NULL) {
         tty->fill_to(2);
         m->method_data()->parameters_type_data()->print_data_on(tty);
       }
       m->print_codes();
       total_size += m->method_data()->size_in_bytes();
     }
     tty->print_cr("------------------------------------------------------------------------");
     tty->print_cr("Total MDO size: %d bytes", total_size);
   }
 }
 void print_bytecode_count() {
   if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
     tty->print_cr("[BytecodeCounter::counter_value = %d]", BytecodeCounter::counter_value());
   }
 }
 AllocStats alloc_stats;
 // General statistics printing (profiling ...)
 void print_statistics() {
 #ifdef ASSERT
   if (CountRuntimeCalls) {
     extern Histogram *RuntimeHistogram;
     RuntimeHistogram->print();
   }
   if (CountJNICalls) {
     extern Histogram *JNIHistogram;
     JNIHistogram->print();
   }
   if (CountJVMCalls) {
     extern Histogram *JVMHistogram;
     JVMHistogram->print();
   }
 #endif
   if (MemProfiling) {
     MemProfiler::disengage();
   }
   if (CITime) {
     CompileBroker::print_times();
   }
 #ifdef COMPILER1
   if ((PrintC1Statistics || LogVMOutput || LogCompilation) && UseCompiler) {
     FlagSetting fs(DisplayVMOutput, DisplayVMOutput && PrintC1Statistics);
     Runtime1::print_statistics();
     Deoptimization::print_statistics();
     SharedRuntime::print_statistics();
     nmethod::print_statistics();
   }
 #endif /* COMPILER1 */
 #ifdef COMPILER2
   if ((PrintOptoStatistics || LogVMOutput || LogCompilation) && UseCompiler) {
     FlagSetting fs(DisplayVMOutput, DisplayVMOutput && PrintOptoStatistics);
     Compile::print_statistics();
 #ifndef COMPILER1
     Deoptimization::print_statistics();
     nmethod::print_statistics();
     SharedRuntime::print_statistics();
 #endif //COMPILER1
     os::print_statistics();
   }
   if (PrintLockStatistics || PrintPreciseBiasedLockingStatistics || PrintPreciseRTMLockingStatistics) {
     OptoRuntime::print_named_counters();
   }
   if (TimeLivenessAnalysis) {
     MethodLiveness::print_times();
   }
 #ifdef ASSERT
   if (CollectIndexSetStatistics) {
     IndexSet::print_statistics();
   }
 #endif // ASSERT
 #endif // COMPILER2
   if (CountCompiledCalls) {
     print_method_invocation_histogram();
   }
   if (ProfileInterpreter COMPILER1_PRESENT(|| C1UpdateMethodData)) {
     print_method_profiling_data();
   }
   if (TimeCompiler) {
     COMPILER2_PRESENT(Compile::print_timers();)
   }
   if (TimeCompilationPolicy) {
     CompilationPolicy::policy()->print_time();
   }
   if (TimeOopMap) {
     GenerateOopMap::print_time();
   }
   if (ProfilerCheckIntervals) {
     PeriodicTask::print_intervals();
   }
   if (PrintSymbolTableSizeHistogram) {
     SymbolTable::print_histogram();
   }
   if (CountBytecodes || TraceBytecodes || StopInterpreterAt) {
     BytecodeCounter::print();
   }
   if (PrintBytecodePairHistogram) {
     BytecodePairHistogram::print();
   }
   if (PrintCodeCache) {
     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
     CodeCache::print();
   }
   if (PrintMethodFlushingStatistics) {
     NMethodSweeper::print();
   }
   if (PrintCodeCache2) {
     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
     CodeCache::print_internals();
   }
   if (PrintClassStatistics) {
     SystemDictionary::print_class_statistics();
   }
   if (PrintMethodStatistics) {
     SystemDictionary::print_method_statistics();
   }
   if (PrintVtableStats) {
     klassVtable::print_statistics();
     klassItable::print_statistics();
   }
   if (VerifyOops && Verbose) {
     tty->print_cr("+VerifyOops count: %d", StubRoutines::verify_oop_count());
   }
   print_bytecode_count();
   if (PrintMallocStatistics) {
     tty->print("allocation stats: ");
     alloc_stats.print();
     tty->cr();
   }
   if (PrintSystemDictionaryAtExit) {
     SystemDictionary::print();
   }
   if (PrintBiasedLockingStatistics) {
     BiasedLocking::print_counters();
   }
 #ifdef ENABLE_ZAP_DEAD_LOCALS
 #ifdef COMPILER2
   if (ZapDeadCompiledLocals) {
     tty->print_cr("Compile::CompiledZap_count = %d", Compile::CompiledZap_count);
     tty->print_cr("OptoRuntime::ZapDeadCompiledLocals_count = %d", OptoRuntime::ZapDeadCompiledLocals_count);
   }
 #endif // COMPILER2
 #endif // ENABLE_ZAP_DEAD_LOCALS
   // Native memory tracking data
   if (PrintNMTStatistics) {
     MemTracker::final_report(tty);
   }
 }
 #else // PRODUCT MODE STATISTICS
 void print_statistics() {
   if (CITime) {
     CompileBroker::print_times();
   }
   if (PrintCodeCache) {
     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
     CodeCache::print();
   }
   if (PrintMethodFlushingStatistics) {
     NMethodSweeper::print();
   }
 #ifdef COMPILER2
   if (PrintPreciseBiasedLockingStatistics || PrintPreciseRTMLockingStatistics) {
     OptoRuntime::print_named_counters();
   }
 #endif
   if (PrintBiasedLockingStatistics) {
     BiasedLocking::print_counters();
   }
   // Native memory tracking data
   if (PrintNMTStatistics) {
     MemTracker::final_report(tty);
   }
 }
 #endif
 // Helper class for registering on_exit calls through JVM_OnExit
 extern "C" {
     typedef void (*__exit_proc)(void);
 }
 class ExitProc : public CHeapObj<mtInternal> {
  private:
   __exit_proc _proc;
   // void (*_proc)(void);
   ExitProc* _next;
  public:
   // ExitProc(void (*proc)(void)) {
   ExitProc(__exit_proc proc) {
     _proc = proc;
     _next = NULL;
   }
   void evaluate()               { _proc(); }
   ExitProc* next() const        { return _next; }
   void set_next(ExitProc* next) { _next = next; }
 };
 // Linked list of registered on_exit procedures
 static ExitProc* exit_procs = NULL;
 extern "C" {
   void register_on_exit_function(void (*func)(void)) {
     ExitProc *entry = new ExitProc(func);
     // Classic vm does not throw an exception in case the allocation failed,
     if (entry != NULL) {
       entry->set_next(exit_procs);
       exit_procs = entry;
     }
   }
 }
 // Note: before_exit() can be executed only once, if more than one threads
 //       are trying to shutdown the VM at the same time, only one thread
 //       can run before_exit() and all other threads must wait.
 void before_exit(JavaThread * thread) {
   #define BEFORE_EXIT_NOT_RUN 0
   #define BEFORE_EXIT_RUNNING 1
   #define BEFORE_EXIT_DONE    2
   static jint volatile _before_exit_status = BEFORE_EXIT_NOT_RUN;
   // Note: don't use a Mutex to guard the entire before_exit(), as
   // JVMTI post_thread_end_event and post_vm_death_event will run native code.
   // A CAS or OSMutex would work just fine but then we need to manipulate
   // thread state for Safepoint. Here we use Monitor wait() and notify_all()
   // for synchronization.
   { MutexLocker ml(BeforeExit_lock);
     switch (_before_exit_status) {
     case BEFORE_EXIT_NOT_RUN:
       _before_exit_status = BEFORE_EXIT_RUNNING;
       break;
     case BEFORE_EXIT_RUNNING:
       while (_before_exit_status == BEFORE_EXIT_RUNNING) {
         BeforeExit_lock->wait();
       }
       assert(_before_exit_status == BEFORE_EXIT_DONE, "invalid state");
       return;
     case BEFORE_EXIT_DONE:
       return;
     }
   }
   // The only difference between this and Win32's _onexit procs is that
   // this version is invoked before any threads get killed.
   ExitProc* current = exit_procs;
   while (current != NULL) {
     ExitProc* next = current->next();
     current->evaluate();
     delete current;
     current = next;
   }
   // Hang forever on exit if we're reporting an error.
   if (ShowMessageBoxOnError && is_error_reported()) {
     os::infinite_sleep();
   }
   // Terminate watcher thread - must before disenrolling any periodic task
   if (PeriodicTask::num_tasks() > 0)
     WatcherThread::stop();
   // Print statistics gathered (profiling ...)
   if (Arguments::has_profile()) {
     FlatProfiler::disengage();
     FlatProfiler::print(10);
   }
   // shut down the StatSampler task
   StatSampler::disengage();
   StatSampler::destroy();
   // Stop concurrent GC threads
   Universe::heap()->stop();
   // Print GC/heap related information.
   if (PrintGCDetails) {
     Universe::print();
     AdaptiveSizePolicyOutput(0);
     if (Verbose) {
       ClassLoaderDataGraph::dump_on(gclog_or_tty);
     }
   }
   if (PrintBytecodeHistogram) {
     BytecodeHistogram::print();
   }
   if (JvmtiExport::should_post_thread_life()) {
     JvmtiExport::post_thread_end(thread);
   }
   EventThreadEnd event;
   if (event.should_commit()) {
     event.set_thread(JFR_THREAD_ID(thread));
     event.commit();
   }
   JFR_ONLY(Jfr::on_vm_shutdown();)
   // Always call even when there are not JVMTI environments yet, since environments
   // may be attached late and JVMTI must track phases of VM execution
   JvmtiExport::post_vm_death();
   Threads::shutdown_vm_agents();
   // Terminate the signal thread
   // Note: we don't wait until it actually dies.
   os::terminate_signal_thread();
   print_statistics();
   Universe::heap()->print_tracing_info();
   { MutexLocker ml(BeforeExit_lock);
     _before_exit_status = BEFORE_EXIT_DONE;
     BeforeExit_lock->notify_all();
   }
   if (VerifyStringTableAtExit) {
     int fail_cnt = 0;
     {
       MutexLocker ml(StringTable_lock);
       fail_cnt = StringTable::verify_and_compare_entries();
     }
     if (fail_cnt != 0) {
       tty->print_cr("ERROR: fail_cnt=%d", fail_cnt);
       guarantee(fail_cnt == 0, "unexpected StringTable verification failures");
     }
   }
   #undef BEFORE_EXIT_NOT_RUN
   #undef BEFORE_EXIT_RUNNING
   #undef BEFORE_EXIT_DONE
 }
 void vm_exit(int code) {
   Thread* thread = ThreadLocalStorage::is_initialized() ?
     ThreadLocalStorage::get_thread_slow() : NULL;
   if (thread == NULL) {
     // we have serious problems -- just exit
     vm_direct_exit(code);
   }
   if (VMThread::vm_thread() != NULL) {
     // Fire off a VM_Exit operation to bring VM to a safepoint and exit
     VM_Exit op(code);
     if (thread->is_Java_thread())
       ((JavaThread*)thread)->set_thread_state(_thread_in_vm);
     VMThread::execute(&op);
     // should never reach here; but in case something wrong with VM Thread.
     vm_direct_exit(code);
   } else {
     // VM thread is gone, just exit
     vm_direct_exit(code);
   }
   ShouldNotReachHere();
 }
 void notify_vm_shutdown() {
   // For now, just a dtrace probe.
 #ifndef USDT2
   HS_DTRACE_PROBE(hotspot, vm__shutdown);
   HS_DTRACE_WORKAROUND_TAIL_CALL_BUG();
 #else /* USDT2 */
   HOTSPOT_VM_SHUTDOWN();
 #endif /* USDT2 */
 }
 void vm_direct_exit(int code) {
   notify_vm_shutdown();
   os::wait_for_keypress_at_exit();
   ::exit(code);
 }
 void vm_perform_shutdown_actions() {
   // Warning: do not call 'exit_globals()' here. All threads are still running.
   // Calling 'exit_globals()' will disable thread-local-storage and cause all
   // kinds of assertions to trigger in debug mode.
   if (is_init_completed()) {
     Thread* thread = ThreadLocalStorage::is_initialized() ?
                      ThreadLocalStorage::get_thread_slow() : NULL;
     if (thread != NULL && thread->is_Java_thread()) {
       // We are leaving the VM, set state to native (in case any OS exit
       // handlers call back to the VM)
       JavaThread* jt = (JavaThread*)thread;
       // Must always be walkable or have no last_Java_frame when in
       // thread_in_native
       jt->frame_anchor()->make_walkable(jt);
       jt->set_thread_state(_thread_in_native);
     }
   }
   notify_vm_shutdown();
 }
 void vm_shutdown()
 {
   vm_perform_shutdown_actions();
   os::wait_for_keypress_at_exit();
   os::shutdown();
 }
 void vm_abort(bool dump_core) {
   vm_perform_shutdown_actions();
   os::wait_for_keypress_at_exit();
   os::abort(dump_core);
   ShouldNotReachHere();
 }
 void vm_notify_during_shutdown(const char* error, const char* message) {
   if (error != NULL) {
     tty->print_cr("Error occurred during initialization of VM");
     tty->print("%s", error);
     if (message != NULL) {
       tty->print_cr(": %s", message);
     }
     else {
       tty->cr();
     }
   }
   if (ShowMessageBoxOnError && WizardMode) {
     fatal("Error occurred during initialization of VM");
   }
 }
 void vm_exit_during_initialization(Handle exception) {
   tty->print_cr("Error occurred during initialization of VM");
   // If there are exceptions on this thread it must be cleared
   // first and here. Any future calls to EXCEPTION_MARK requires
   // that no pending exceptions exist.
   Thread *THREAD = Thread::current();
   if (HAS_PENDING_EXCEPTION) {
     CLEAR_PENDING_EXCEPTION;
   }
   java_lang_Throwable::print(exception, tty);
   tty->cr();
   java_lang_Throwable::print_stack_trace(exception(), tty);
   tty->cr();
   vm_notify_during_shutdown(NULL, NULL);
   // Failure during initialization, we don't want to dump core
   vm_abort(false);
 }
 void vm_exit_during_initialization(Symbol* ex, const char* message) {
   ResourceMark rm;
   vm_notify_during_shutdown(ex->as_C_string(), message);
   // Failure during initialization, we don't want to dump core
   vm_abort(false);
 }
 void vm_exit_during_initialization(const char* error, const char* message) {
   vm_notify_during_shutdown(error, message);
   // Failure during initialization, we don't want to dump core
   vm_abort(false);
 }
 void vm_shutdown_during_initialization(const char* error, const char* message) {
   vm_notify_during_shutdown(error, message);
   vm_shutdown();
 }
 JDK_Version JDK_Version::_current;
 const char* JDK_Version::_runtime_name;
 const char* JDK_Version::_runtime_version;
 void JDK_Version::initialize() {
   jdk_version_info info;
   assert(!_current.is_valid(), "Don't initialize twice");
   void *lib_handle = os::native_java_library();
   jdk_version_info_fn_t func = CAST_TO_FN_PTR(jdk_version_info_fn_t,
      os::dll_lookup(lib_handle, "JDK_GetVersionInfo0"));
   if (func == NULL) {
     // JDK older than 1.6
     _current._partially_initialized = true;
   } else {
     (*func)(&info, sizeof(info));
     int major = JDK_VERSION_MAJOR(info.jdk_version);
     int minor = JDK_VERSION_MINOR(info.jdk_version);
     int micro = JDK_VERSION_MICRO(info.jdk_version);
     int build = JDK_VERSION_BUILD(info.jdk_version);
     if (major == 1 && minor > 4) {
       // We represent "1.5.0" as "5.0", but 1.4.2 as itself.
       major = minor;
       minor = micro;
       micro = 0;
     }
     _current = JDK_Version(major, minor, micro, info.update_version,
                            info.special_update_version, build,
                            info.thread_park_blocker == 1,
                            info.post_vm_init_hook_enabled == 1,
                            info.pending_list_uses_discovered_field == 1);
   }
 }
 void JDK_Version::fully_initialize(
     uint8_t major, uint8_t minor, uint8_t micro, uint8_t update) {
   // This is only called when current is less than 1.6 and we've gotten
   // far enough in the initialization to determine the exact version.
   assert(major < 6, "not needed for JDK version >= 6");
   assert(is_partially_initialized(), "must not initialize");
   if (major < 5) {
     // JDK verison sequence: 1.2.x, 1.3.x, 1.4.x, 5.0.x, 6.0.x, etc.
     micro = minor;
     minor = major;
     major = 1;
   }
   _current = JDK_Version(major, minor, micro, update);
 }
 void JDK_Version_init() {
   JDK_Version::initialize();
 }
 static int64_t encode_jdk_version(const JDK_Version& v) {
   return
     ((int64_t)v.major_version()          << (BitsPerByte * 5)) |
     ((int64_t)v.minor_version()          << (BitsPerByte * 4)) |
     ((int64_t)v.micro_version()          << (BitsPerByte * 3)) |
     ((int64_t)v.update_version()         << (BitsPerByte * 2)) |
     ((int64_t)v.special_update_version() << (BitsPerByte * 1)) |
     ((int64_t)v.build_number()           << (BitsPerByte * 0));
 }
 int JDK_Version::compare(const JDK_Version& other) const {
   assert(is_valid() && other.is_valid(), "Invalid version (uninitialized?)");
   if (!is_partially_initialized() && other.is_partially_initialized()) {
     return -(other.compare(*this)); // flip the comparators
   }
   assert(!other.is_partially_initialized(), "Not initialized yet");
   if (is_partially_initialized()) {
     assert(other.major_version() >= 6,
            "Invalid JDK version comparison during initialization");
     return -1;
   } else {
     uint64_t e = encode_jdk_version(*this);
     uint64_t o = encode_jdk_version(other);
     return (e > o) ? 1 : ((e == o) ? 0 : -1);
   }
 }
 void JDK_Version::to_string(char* buffer, size_t buflen) const {
   assert(buffer && buflen > 0, "call with useful buffer");
   size_t index = 0;
   if (!is_valid()) {
     jio_snprintf(buffer, buflen, "%s", "(uninitialized)");
   } else if (is_partially_initialized()) {
     jio_snprintf(buffer, buflen, "%s", "(uninitialized) pre-1.6.0");
   } else {
     int rc = jio_snprintf(
         &buffer[index], buflen - index, "%d.%d", _major, _minor);
     if (rc == -1) return;
     index += rc;
     if (_micro > 0) {
       rc = jio_snprintf(&buffer[index], buflen - index, ".%d", _micro);
       if (rc == -1) return;
       index += rc;
     }
     if (_update > 0) {
       rc = jio_snprintf(&buffer[index], buflen - index, "_%02d", _update);
       if (rc == -1) return;
       index += rc;
     }
     if (_special > 0) {
       rc = jio_snprintf(&buffer[index], buflen - index, "%c", _special);
       if (rc == -1) return;
       index += rc;
     }
     if (_build > 0) {
       rc = jio_snprintf(&buffer[index], buflen - index, "-b%02d", _build);
       if (rc == -1) return;
       index += rc;
     }
   }
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/runtime/java.cpp@72053ed6f8d4 (annotated)

src/share/vm/runtime/java.cpp