src/hotspot/share/services/classLoadingService.hpp

/*
 * Copyright (c) 2003, 2024, 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.
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#ifndef SHARE_SERVICES_CLASSLOADINGSERVICE_HPP
#define SHARE_SERVICES_CLASSLOADINGSERVICE_HPP

#include "logging/log.hpp"
#include "runtime/handles.hpp"
#include "runtime/perfData.hpp"
#include "utilities/growableArray.hpp"
#include "utilities/macros.hpp"

class InstanceKlass;

// VM monitoring and management support for the Class Loading subsystem
class ClassLoadingService : public AllStatic {
 private:
  // Counters for classes loaded from class files
  static PerfCounter*  _classes_loaded_count;
  static PerfCounter*  _classes_unloaded_count;
  static PerfCounter*  _classbytes_loaded;
  static PerfCounter*  _classbytes_unloaded;

  // Counters for classes loaded from shared archive
  static PerfCounter*  _shared_classes_loaded_count;
  static PerfCounter*  _shared_classes_unloaded_count;
  static PerfCounter*  _shared_classbytes_loaded;
  static PerfCounter*  _shared_classbytes_unloaded;

  static PerfVariable* _class_methods_size;

 public:
  static void init() NOT_MANAGEMENT_RETURN;
  static bool set_verbose(bool verbose) NOT_MANAGEMENT_RETURN_(false);
  static bool get_verbose() NOT_MANAGEMENT_RETURN_(false);
  static void reset_trace_class_unloading() NOT_MANAGEMENT_RETURN;
  static jlong loaded_class_count() NOT_MANAGEMENT_RETURN_(0L);
  static jlong unloaded_class_count() NOT_MANAGEMENT_RETURN_(0L);
  static jlong loaded_class_bytes() NOT_MANAGEMENT_RETURN_(0L);
  static jlong unloaded_class_bytes() NOT_MANAGEMENT_RETURN_(0L);
  static jlong loaded_shared_class_count() NOT_MANAGEMENT_RETURN_(0L);
  static jlong unloaded_shared_class_count() NOT_MANAGEMENT_RETURN_(0L);
  static jlong loaded_shared_class_bytes() NOT_MANAGEMENT_RETURN_(0L);
  static jlong unloaded_shared_class_bytes() NOT_MANAGEMENT_RETURN_(0L);
  static jlong class_method_data_size() NOT_MANAGEMENT_RETURN_(0L);

  static void notify_class_loaded(InstanceKlass* k, bool shared_class)
      NOT_MANAGEMENT_RETURN;
  // All unloaded classes are non-shared
  static void notify_class_unloaded(InstanceKlass* k) NOT_MANAGEMENT_RETURN;
  static void add_class_method_size(int size) {
#if INCLUDE_MANAGEMENT
    if (UsePerfData) {
      _class_methods_size->inc(size);
    }
#endif // INCLUDE_MANAGEMENT
  }
};

#endif // SHARE_SERVICES_CLASSLOADINGSERVICE_HPP