1 /*

     2  * Copyright (c) 2016, 2018, 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_JFR_WRITERS_JFRPOSITION_HPP

    26 #define SHARE_VM_JFR_WRITERS_JFRPOSITION_HPP

    27 

    28 #include "utilities/debug.hpp"

    29 #include "utilities/globalDefinitions.hpp"

    30 

    31 template <typename AP> // AllocationPolicy

    32 class Position : public AP {

    33  private:

    34   const u1* _start_pos; // logical start

    35   u1* _current_pos;

    36   const u1* _end_pos;

    37 

    38  protected:

    39   const u1* start_pos() const;

    40   void set_start_pos(const u1* position);

    41   u1* current_pos();

    42   void set_current_pos(const u1* new_position);

    43   void set_current_pos(size_t size);

    44   const u1* end_pos() const;

    45   void set_end_pos(const u1* position);

    46   Position(const u1* start_pos, size_t size);

    47   Position();

    48 

    49  public:

    50   size_t available_size() const;

    51   intptr_t used_offset() const;

    52   intptr_t current_offset() const;

    53   size_t used_size() const;

    54   void reset();

    55 };

    56 

    57 #endif // SHARE_VM_JFR_WRITERS_JFRPOSITION_HPP