gcc/ada/s-imgenu.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUNTIME COMPONENTS                          --
   4 --                                                                          --
   5 --                      S Y S T E M . I M G _ E N U M                       --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --                            $Revision: 1.2 $
  10 --                                                                          --
  11 --            Copyright (C) 2000 Free Software Foundation, Inc.             --
  12 --                                                                          --
  13 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  14 -- terms of the  GNU General Public License as published  by the Free Soft- --
  15 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  16 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  17 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  18 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  19 -- for  more details.  You should have  received  a copy of the GNU General --
  20 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  21 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  22 -- MA 02111-1307, USA.                                                      --
  23 --                                                                          --
  24 -- As a special exception,  if other files  instantiate  generics from this --
  25 -- unit, or you link  this unit with other files  to produce an executable, --
  26 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  27 -- covered  by the  GNU  General  Public  License.  This exception does not --
  28 -- however invalidate  any other reasons why  the executable file  might be --
  29 -- covered by the  GNU Public License.                                      --
  30 --                                                                          --
  31 -- GNAT was originally developed  by the GNAT team at  New York University. --
  32 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
  33 --                                                                          --
  34 ------------------------------------------------------------------------------
  35
  36 --  Enumeration_Type'Image for all enumeration types except those in package
  37 --  Standard (where we have no opportunity to build image tables), and in
  38 --  package System (where it is too early to start building image tables).
  39 --  Special routines exist for the enumeration routines in these packages.
  40
  41 package System.Img_Enum is
  42 pragma Pure (Img_Enum);
  43
  44    function Image_Enumeration_8
  45      (Pos     : Natural;
  46       Names   : String;
  47       Indexes : System.Address)
  48       return    String;
  49    --  Used to compute Enum'Image (Str) where Enum is some enumeration type
  50    --  other than those defined in package Standard. Names is a string with
  51    --  a lower bound of 1 containing the characters of all the enumeration
  52    --  literals concatenated together in sequence. Indexes is the address
  53    --  of an array of type array (0 .. N) of Natural_8, where N is the
  54    --  is the number of enumeration literals in the type. The Indexes values
  55    --  are the starting subscript of each enumeration literal, indexed by Pos
  56    --  values, with an extra entry at the end containing Names'Length + 1.
  57    --  The reason that Indexes is passed by address is that the actual type
  58    --  is created on the fly by the expander. The value returned is the
  59    --  desired 'Image value.
  60
  61    function Image_Enumeration_16
  62      (Pos     : Natural;
  63       Names   : String;
  64       Indexes : System.Address)
  65       return    String;
  66    --  Identical to Image_Enumeration_8 except that it handles types
  67    --  using array (0 .. Num) of Natural_16 for the Indexes table.
  68
  69    function Image_Enumeration_32
  70      (Pos     : Natural;
  71       Names   : String;
  72       Indexes : System.Address)
  73       return    String;
  74    --  Identical to Image_Enumeration_8 except that it handles types
  75    --  using array (0 .. Num) of Natural_32 for the Indexes table.
  76
  77
  78 end System.Img_Enum;