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 /*

  * Copyright (c) 2003, 2013, 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_VM_SERVICES_MEMORYUSAGE_HPP

 #define SHARE_VM_SERVICES_MEMORYUSAGE_HPP

 #include "utilities/globalDefinitions.hpp"

 // A memory usage contains the following attributes about memory usage:

 //  initSize - represents the initial amount of memory (in bytes) that

 //     the Java virtual machine requests from the operating system

 //     for memory management.  The Java virtual machine may request

 //     additional memory from the operating system later when appropriate.

 //     Its value may be undefined.

 //  used      - represents the amount of memory currently used (in bytes).

 //  committed - represents the amount of memory (in bytes) that is

 //     guaranteed to be available for use by the Java virtual machine.

 //     The amount of committed memory may change over time (increase

 //     or decrease).  It is guaranteed to be greater than or equal

 //     to initSize.

 //  maxSize   - represents the maximum amount of memory (in bytes)

 //     that can be used for memory management. The maximum amount of

 //     memory for memory management could be less than the amount of

 //     committed memory.  Its value may be undefined.

 class MemoryUsage VALUE_OBJ_CLASS_SPEC {

 private:

   size_t _initSize;

   size_t _used;

   size_t _committed;

   size_t _maxSize;

 public:

   // Constructors

   MemoryUsage(size_t i, size_t u, size_t c, size_t m) :

     _initSize(i), _used(u), _committed(c), _maxSize(m) {};

   MemoryUsage() :

     _initSize(0), _used(0), _committed(0), _maxSize(0) {};

   size_t init_size() const { return _initSize; }

   size_t used()      const { return _used; }

   size_t committed() const { return _committed; }

   size_t max_size()  const { return _maxSize; }

   static size_t undefined_size() { return (size_t) -1; }

   inline static jlong convert_to_jlong(size_t val) {

     // In the 64-bit vm, a size_t can overflow a jlong (which is signed).

     jlong ret;

     if (val == undefined_size()) {

       ret = -1L;

     } else {

       NOT_LP64(ret = val;)

       LP64_ONLY(ret = MIN2(val, (size_t)max_jlong);)

     }

     return ret;

   }

   jlong init_size_as_jlong() const { return convert_to_jlong(_initSize); }

   jlong used_as_jlong()      const { return convert_to_jlong(_used); }

   jlong committed_as_jlong() const { return convert_to_jlong(_committed); }

   jlong max_size_as_jlong()  const { return convert_to_jlong(_maxSize); }

 };

 #endif // SHARE_VM_SERVICES_MEMORYUSAGE_HPP