gcc/ada/s-pack12.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUNTIME COMPONENTS                          --
   4 --                                                                          --
   5 --                       S Y S T E M . P A C K _ 1 2                        --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --                                                                          --
  10 --          Copyright (C) 1992-1999 Free Software Foundation, Inc.          --
  11 --                                                                          --
  12 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  13 -- terms of the  GNU General Public License as published  by the Free Soft- --
  14 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  15 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  16 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  17 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  18 -- for  more details.  You should have  received  a copy of the GNU General --
  19 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  20 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  21 -- MA 02111-1307, USA.                                                      --
  22 --                                                                          --
  23 -- As a special exception,  if other files  instantiate  generics from this --
  24 -- unit, or you link  this unit with other files  to produce an executable, --
  25 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  26 -- covered  by the  GNU  General  Public  License.  This exception does not --
  27 -- however invalidate  any other reasons why  the executable file  might be --
  28 -- covered by the  GNU Public License.                                      --
  29 --                                                                          --
  30 -- GNAT was originally developed  by the GNAT team at  New York University. --
  31 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  32 --                                                                          --
  33 ------------------------------------------------------------------------------
  34
  35 --  Handling of packed arrays with Component_Size = 12
  36
  37 package System.Pack_12 is
  38 pragma Preelaborate (Pack_12);
  39
  40    Bits : constant := 12;
  41
  42    type Bits_12 is mod 2 ** Bits;
  43    for Bits_12'Size use Bits;
  44
  45    function Get_12 (Arr : System.Address; N : Natural) return Bits_12;
  46    --  Arr is the address of the packed array, N is the zero-based
  47    --  subscript. This element is extracted and returned.
  48
  49    procedure Set_12 (Arr : System.Address; N : Natural; E : Bits_12);
  50    --  Arr is the address of the packed array, N is the zero-based
  51    --  subscript. This element is set to the given value.
  52
  53    function GetU_12 (Arr : System.Address; N : Natural) return Bits_12;
  54    --  Arr is the address of the packed array, N is the zero-based
  55    --  subscript. This element is extracted and returned. This version
  56    --  is used when Arr may represent an unaligned address.
  57
  58    procedure SetU_12 (Arr : System.Address; N : Natural; E : Bits_12);
  59    --  Arr is the address of the packed array, N is the zero-based
  60    --  subscript. This element is set to the given value. This version
  61    --  is used when Arr may represent an unaligned address
  62
  63 end System.Pack_12;