gcc/ada/s-imgenu.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUN-TIME COMPONENTS                         --
   4 --                                                                          --
   5 --                      S Y S T E M . I M G _ E N U M                       --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 2000-2005 Free Software Foundation, Inc.          --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  19 -- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
  20 -- Boston, MA 02110-1301, USA.                                              --
  21 --                                                                          --
  22 -- As a special exception,  if other files  instantiate  generics from this --
  23 -- unit, or you link  this unit with other files  to produce an executable, --
  24 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  25 -- covered  by the  GNU  General  Public  License.  This exception does not --
  26 -- however invalidate  any other reasons why  the executable file  might be --
  27 -- covered by the  GNU Public License.                                      --
  28 --                                                                          --
  29 -- GNAT was originally developed  by the GNAT team at  New York University. --
  30 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 with Unchecked_Conversion;
  35
  36 package body System.Img_Enum is
  37
  38    -------------------------
  39    -- Image_Enumeration_8 --
  40    -------------------------
  41
  42    function Image_Enumeration_8
  43      (Pos     : Natural;
  44       Names   : String;
  45       Indexes : System.Address)
  46       return    String
  47    is
  48       type Natural_8 is range 0 .. 2 ** 7 - 1;
  49       type Index_Table is array (Natural) of Natural_8;
  50       type Index_Table_Ptr is access Index_Table;
  51
  52       function To_Index_Table_Ptr is
  53         new Unchecked_Conversion (System.Address, Index_Table_Ptr);
  54
  55       IndexesT : constant Index_Table_Ptr := To_Index_Table_Ptr (Indexes);
  56
  57       Start : constant Natural := Natural (IndexesT (Pos));
  58       Next  : constant Natural := Natural (IndexesT (Pos + 1));
  59
  60       subtype Result_Type is String (1 .. Next - Start);
  61       --  We need this result type to force the result to have the
  62       --  required lower bound of 1, rather than the slice bounds.
  63
  64    begin
  65       return Result_Type (Names (Start .. Next - 1));
  66    end Image_Enumeration_8;
  67
  68    --------------------------
  69    -- Image_Enumeration_16 --
  70    --------------------------
  71
  72    function Image_Enumeration_16
  73      (Pos     : Natural;
  74       Names   : String;
  75       Indexes : System.Address)
  76       return    String
  77    is
  78       type Natural_16 is range 0 .. 2 ** 15 - 1;
  79       type Index_Table is array (Natural) of Natural_16;
  80       type Index_Table_Ptr is access Index_Table;
  81
  82       function To_Index_Table_Ptr is
  83         new Unchecked_Conversion (System.Address, Index_Table_Ptr);
  84
  85       IndexesT : constant Index_Table_Ptr := To_Index_Table_Ptr (Indexes);
  86
  87       Start : constant Natural := Natural (IndexesT (Pos));
  88       Next  : constant Natural := Natural (IndexesT (Pos + 1));
  89
  90       subtype Result_Type is String (1 .. Next - Start);
  91       --  We need this result type to force the result to have the
  92       --  required lower bound of 1, rather than the slice bounds.
  93
  94    begin
  95       return Result_Type (Names (Start .. Next - 1));
  96    end Image_Enumeration_16;
  97
  98    --------------------------
  99    -- Image_Enumeration_32 --
 100    --------------------------
 101
 102    function Image_Enumeration_32
 103      (Pos     : Natural;
 104       Names   : String;
 105       Indexes : System.Address)
 106       return    String
 107    is
 108       type Natural_32 is range 0 .. 2 ** 31 - 1;
 109       type Index_Table is array (Natural) of Natural_32;
 110       type Index_Table_Ptr is access Index_Table;
 111
 112       function To_Index_Table_Ptr is
 113         new Unchecked_Conversion (System.Address, Index_Table_Ptr);
 114
 115       IndexesT : constant Index_Table_Ptr := To_Index_Table_Ptr (Indexes);
 116
 117       Start : constant Natural := Natural (IndexesT (Pos));
 118       Next  : constant Natural := Natural (IndexesT (Pos + 1));
 119
 120       subtype Result_Type is String (1 .. Next - Start);
 121       --  We need this result type to force the result to have the
 122       --  required lower bound of 1, rather than the slice bounds.
 123
 124    begin
 125       return Result_Type (Names (Start .. Next - 1));
 126    end Image_Enumeration_32;
 127
 128 end System.Img_Enum;