1 /*
   2  * Copyright (c) 2012, 2015, 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 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1LOG_HPP
  26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1LOG_HPP
  27 
  28 #include "memory/allocation.hpp"
  29 
  30 class G1Log : public AllStatic {
  31  public:
  32   typedef enum {
  33     LevelNone,
  34     LevelFine,
  35     LevelFiner,
  36     LevelFinest
  37   } LogLevel;
  38 
  39  private:
  40   static LogLevel _level;
  41 
  42  public:
  43   inline static bool fine() {
  44     return _level >= LevelFine;
  45   }
  46 
  47   inline static bool finer() {
  48     return _level >= LevelFiner;
  49   }
  50 
  51   inline static bool finest() {
  52     return _level == LevelFinest;
  53   }
  54 
  55   static LogLevel level() {
  56     return _level;
  57   }
  58 
  59   // to be invoked on VM start 
  60   static void init();
  61 
  62   // to be invoked on GC start or flag values change
  63   static void update_level();
  64 };
  65 
  66 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1LOG_HPP