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) 2000-2007, 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 pragma Warnings (Off);
  35 pragma Compiler_Unit;
  36 pragma Warnings (On);
  37
  38 with Ada.Unchecked_Conversion;
  39
  40 package body System.Img_Enum is
  41
  42    -------------------------
  43    -- Image_Enumeration_8 --
  44    -------------------------
  45
  46    function Image_Enumeration_8
  47      (Pos     : Natural;
  48       Names   : String;
  49       Indexes : System.Address)
  50       return    String
  51    is
  52       type Natural_8 is range 0 .. 2 ** 7 - 1;
  53       type Index_Table is array (Natural) of Natural_8;
  54       type Index_Table_Ptr is access Index_Table;
  55
  56       function To_Index_Table_Ptr is
  57         new Ada.Unchecked_Conversion (System.Address, Index_Table_Ptr);
  58
  59       IndexesT : constant Index_Table_Ptr := To_Index_Table_Ptr (Indexes);
  60
  61       Start : constant Natural := Natural (IndexesT (Pos));
  62       Next  : constant Natural := Natural (IndexesT (Pos + 1));
  63
  64       subtype Result_Type is String (1 .. Next - Start);
  65       --  We need this result type to force the result to have the
  66       --  required lower bound of 1, rather than the slice bounds.
  67
  68    begin
  69       return Result_Type (Names (Start .. Next - 1));
  70    end Image_Enumeration_8;
  71
  72    --------------------------
  73    -- Image_Enumeration_16 --
  74    --------------------------
  75
  76    function Image_Enumeration_16
  77      (Pos     : Natural;
  78       Names   : String;
  79       Indexes : System.Address)
  80       return    String
  81    is
  82       type Natural_16 is range 0 .. 2 ** 15 - 1;
  83       type Index_Table is array (Natural) of Natural_16;
  84       type Index_Table_Ptr is access Index_Table;
  85
  86       function To_Index_Table_Ptr is
  87         new Ada.Unchecked_Conversion (System.Address, Index_Table_Ptr);
  88
  89       IndexesT : constant Index_Table_Ptr := To_Index_Table_Ptr (Indexes);
  90
  91       Start : constant Natural := Natural (IndexesT (Pos));
  92       Next  : constant Natural := Natural (IndexesT (Pos + 1));
  93
  94       subtype Result_Type is String (1 .. Next - Start);
  95       --  We need this result type to force the result to have the
  96       --  required lower bound of 1, rather than the slice bounds.
  97
  98    begin
  99       return Result_Type (Names (Start .. Next - 1));
 100    end Image_Enumeration_16;
 101
 102    --------------------------
 103    -- Image_Enumeration_32 --
 104    --------------------------
 105
 106    function Image_Enumeration_32
 107      (Pos     : Natural;
 108       Names   : String;
 109       Indexes : System.Address)
 110       return    String
 111    is
 112       type Natural_32 is range 0 .. 2 ** 31 - 1;
 113       type Index_Table is array (Natural) of Natural_32;
 114       type Index_Table_Ptr is access Index_Table;
 115
 116       function To_Index_Table_Ptr is
 117         new Ada.Unchecked_Conversion (System.Address, Index_Table_Ptr);
 118
 119       IndexesT : constant Index_Table_Ptr := To_Index_Table_Ptr (Indexes);
 120
 121       Start : constant Natural := Natural (IndexesT (Pos));
 122       Next  : constant Natural := Natural (IndexesT (Pos + 1));
 123
 124       subtype Result_Type is String (1 .. Next - Start);
 125       --  We need this result type to force the result to have the
 126       --  required lower bound of 1, rather than the slice bounds.
 127
 128    begin
 129       return Result_Type (Names (Start .. Next - 1));
 130    end Image_Enumeration_32;
 131
 132 end System.Img_Enum;