1 /*
   2  * Copyright (c) 2016, 2019, 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