gcc/ada/s-imgenu.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUNTIME COMPONENTS                          --
   4 --                                                                          --
   5 --                      S Y S T E M . I M G _ E N U M                       --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --                            $Revision: 1.1 $
  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 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  33 --                                                                          --
  34 ------------------------------------------------------------------------------
  35
  36 with Unchecked_Conversion;
  37
  38 package body System.Img_Enum is
  39
  40    -------------------------
  41    -- Image_Enumeration_8 --
  42    -------------------------
  43
  44    function Image_Enumeration_8
  45      (Pos     : Natural;
  46       Names   : String;
  47       Indexes : System.Address)
  48       return    String
  49    is
  50       type Natural_8 is range 0 .. 2 ** 7 - 1;
  51       type Index_Table is array (Natural) of Natural_8;
  52       type Index_Table_Ptr is access Index_Table;
  53
  54       function To_Index_Table_Ptr is
  55         new Unchecked_Conversion (System.Address, Index_Table_Ptr);
  56
  57       IndexesT : constant Index_Table_Ptr := To_Index_Table_Ptr (Indexes);
  58
  59       Start : Natural := Natural (IndexesT (Pos));
  60       Next  : Natural := Natural (IndexesT (Pos + 1));
  61
  62       subtype Result_Type is String (1 .. Next - Start);
  63       --  We need this result type to force the result to have the
  64       --  required lower bound of 1, rather than the slice bounds.
  65
  66    begin
  67       return Result_Type (Names (Start .. Next - 1));
  68    end Image_Enumeration_8;
  69
  70    --------------------------
  71    -- Image_Enumeration_16 --
  72    --------------------------
  73
  74    function Image_Enumeration_16
  75      (Pos     : Natural;
  76       Names   : String;
  77       Indexes : System.Address)
  78       return    String
  79    is
  80       type Natural_16 is range 0 .. 2 ** 15 - 1;
  81       type Index_Table is array (Natural) of Natural_16;
  82       type Index_Table_Ptr is access Index_Table;
  83
  84       function To_Index_Table_Ptr is
  85         new Unchecked_Conversion (System.Address, Index_Table_Ptr);
  86
  87       IndexesT : constant Index_Table_Ptr := To_Index_Table_Ptr (Indexes);
  88
  89       Start : Natural := Natural (IndexesT (Pos));
  90       Next  : Natural := Natural (IndexesT (Pos + 1));
  91
  92       subtype Result_Type is String (1 .. Next - Start);
  93       --  We need this result type to force the result to have the
  94       --  required lower bound of 1, rather than the slice bounds.
  95
  96    begin
  97       return Result_Type (Names (Start .. Next - 1));
  98    end Image_Enumeration_16;
  99
 100    --------------------------
 101    -- Image_Enumeration_32 --
 102    --------------------------
 103
 104    function Image_Enumeration_32
 105      (Pos     : Natural;
 106       Names   : String;
 107       Indexes : System.Address)
 108       return    String
 109    is
 110       type Natural_32 is range 0 .. 2 ** 31 - 1;
 111       type Index_Table is array (Natural) of Natural_32;
 112       type Index_Table_Ptr is access Index_Table;
 113
 114       function To_Index_Table_Ptr is
 115         new Unchecked_Conversion (System.Address, Index_Table_Ptr);
 116
 117       IndexesT : constant Index_Table_Ptr := To_Index_Table_Ptr (Indexes);
 118
 119       Start : Natural := Natural (IndexesT (Pos));
 120       Next  : Natural := Natural (IndexesT (Pos + 1));
 121
 122       subtype Result_Type is String (1 .. Next - Start);
 123       --  We need this result type to force the result to have the
 124       --  required lower bound of 1, rather than the slice bounds.
 125
 126    begin
 127       return Result_Type (Names (Start .. Next - 1));
 128    end Image_Enumeration_32;
 129
 130 end System.Img_Enum;