1 /*

     2  * Copyright (c) 2000, 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_SHARED_WATERMARK_HPP

    26 #define SHARE_VM_GC_SHARED_WATERMARK_HPP

    27 

    28 #include "memory/allocation.hpp"

    29 #include "utilities/globalDefinitions.hpp"

    30 

    31 // A water mark points into a space and is used during GC to keep track of

    32 // progress.

    33 

    34 class Space;

    35 

    36 class WaterMark VALUE_OBJ_CLASS_SPEC {

    37   friend class VMStructs;

    38  private:

    39   HeapWord* _point;

    40   Space*    _space;

    41  public:

    42   // Accessors

    43   Space* space() const        { return _space;  }

    44   void set_space(Space* s)    { _space = s;     }

    45   HeapWord* point() const     { return _point;  }

    46   void set_point(HeapWord* p) { _point = p;     }

    47 

    48   // Constructors

    49   WaterMark(Space* s, HeapWord* p) : _space(s), _point(p) {};

    50   WaterMark() : _space(NULL), _point(NULL) {};

    51 };

    52 

    53 inline bool operator==(const WaterMark& x, const WaterMark& y) {

    54   return (x.point() == y.point()) && (x.space() == y.space());

    55 }

    56 

    57 inline bool operator!=(const WaterMark& x, const WaterMark& y) {

    58   return !(x == y);

    59 }

    60 

    61 #endif // SHARE_VM_GC_SHARED_WATERMARK_HPP