JDK14/Java14源码在线阅读

/*
 * Copyright (c) 2003, 2019, 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
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#ifndef SHARE_SERVICES_MANAGEMENT_HPP
#define SHARE_SERVICES_MANAGEMENT_HPP

#include "jmm.h"
#include "memory/allocation.hpp"
#include "runtime/handles.hpp"
#include "runtime/timer.hpp"

class OopClosure;
class ThreadSnapshot;

class Management : public AllStatic {
private:
  static PerfVariable*      _begin_vm_creation_time;
  static PerfVariable*      _end_vm_creation_time;
  static PerfVariable*      _vm_init_done_time;
  static jmmOptionalSupport _optional_support;
  static TimeStamp          _stamp; // Timestamp since vm init done time

  // Management klasses
  static InstanceKlass*     _diagnosticCommandImpl_klass;
  static InstanceKlass*     _garbageCollectorExtImpl_klass;
  static InstanceKlass*     _garbageCollectorMXBean_klass;
  static InstanceKlass*     _gcInfo_klass;
  static InstanceKlass*     _managementFactoryHelper_klass;
  static InstanceKlass*     _memoryManagerMXBean_klass;
  static InstanceKlass*     _memoryPoolMXBean_klass;
  static InstanceKlass*     _memoryUsage_klass;
  static InstanceKlass*     _sensor_klass;
  static InstanceKlass*     _threadInfo_klass;
  static InstanceKlass* load_and_initialize_klass(Symbol* sh, TRAPS);
  static InstanceKlass* load_and_initialize_klass_or_null(Symbol* sh, TRAPS);
  static InstanceKlass* initialize_klass(Klass* k, TRAPS);

public:
  static void init();
  static void initialize(TRAPS);

  static jlong ticks_to_ms(jlong ticks) NOT_MANAGEMENT_RETURN_(0L);
  static jlong timestamp() NOT_MANAGEMENT_RETURN_(0L);

  static void  oops_do(OopClosure* f) NOT_MANAGEMENT_RETURN;
  static void* get_jmm_interface(int version);
  static void  get_optional_support(jmmOptionalSupport* support);

  static void get_loaded_classes(JavaThread* cur_thread, GrowableArray<Klass*>* klass_array);

  static void  record_vm_startup_time(jlong begin, jlong duration)
      NOT_MANAGEMENT_RETURN;
  static void  record_vm_init_completed() {
    // Initialize the timestamp to get the current time
    _vm_init_done_time->set_value(os::javaTimeMillis());

    // Update the timestamp to the vm init done time
    _stamp.update();
  }

  static jlong begin_vm_creation_time() {
    return _begin_vm_creation_time->get_value();
  }
  static jlong vm_init_done_time() {
    return _vm_init_done_time->get_value();
  }

  // methods to return a Klass*.
  static InstanceKlass* java_lang_management_ThreadInfo_klass(TRAPS);
  static InstanceKlass* java_lang_management_MemoryUsage_klass(TRAPS)
      NOT_MANAGEMENT_RETURN_(NULL);
  static InstanceKlass* java_lang_management_MemoryPoolMXBean_klass(TRAPS);
  static InstanceKlass* java_lang_management_MemoryManagerMXBean_klass(TRAPS);
  static InstanceKlass* java_lang_management_GarbageCollectorMXBean_klass(TRAPS);
  static InstanceKlass* sun_management_ManagementFactoryHelper_klass(TRAPS)
      NOT_MANAGEMENT_RETURN_(NULL);
  static InstanceKlass* sun_management_Sensor_klass(TRAPS)
      NOT_MANAGEMENT_RETURN_(NULL);
  static InstanceKlass* com_sun_management_internal_GarbageCollectorExtImpl_klass(TRAPS)
      NOT_MANAGEMENT_RETURN_(NULL);
  static InstanceKlass* com_sun_management_GcInfo_klass(TRAPS)
      NOT_MANAGEMENT_RETURN_(NULL);
  static InstanceKlass* com_sun_management_internal_DiagnosticCommandImpl_klass(TRAPS)
      NOT_MANAGEMENT_RETURN_(NULL);

  static instanceOop create_thread_info_instance(ThreadSnapshot* snapshot, TRAPS);
  static instanceOop create_thread_info_instance(ThreadSnapshot* snapshot, objArrayHandle monitors_array, typeArrayHandle depths_array, objArrayHandle synchronizers_array, TRAPS);
};

class TraceVmCreationTime : public StackObj {
private:
  TimeStamp _timer;
  jlong     _begin_time;

public:

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