gcc/ada/s-stoele.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --               S Y S T E M . S T O R A G E _ E L E M E N T S              --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --                            $Revision: 1.1.16.1 $
  10 --                                                                          --
  11 --        Copyright (C) 1992,1993,1994 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 package body System.Storage_Elements is
  38
  39    pragma Suppress (All_Checks);
  40
  41    function To_Address is new Unchecked_Conversion (Storage_Offset, Address);
  42    function To_Offset  is new Unchecked_Conversion (Address, Storage_Offset);
  43
  44    --  Address arithmetic
  45
  46    function "+" (Left : Address; Right : Storage_Offset) return Address is
  47    begin
  48       return Left + To_Address (Right);
  49    end "+";
  50
  51    function "+" (Left : Storage_Offset; Right : Address) return Address is
  52    begin
  53       return To_Address (Left) + Right;
  54    end "+";
  55
  56    function "-" (Left : Address; Right : Storage_Offset) return Address is
  57    begin
  58       return Left - To_Address (Right);
  59    end "-";
  60
  61    function "-" (Left, Right : Address) return Storage_Offset is
  62    begin
  63       return To_Offset (Left - Right);
  64    end "-";
  65
  66    function "mod" (Left : Address; Right : Storage_Offset)
  67      return Storage_Offset is
  68    begin
  69       if Right >= 0 then
  70          return Storage_Offset (Address'(Left mod Address (Right)));
  71       else
  72          return -Storage_Offset (Address'(Left mod Address (-Right)));
  73       end if;
  74    end "mod";
  75
  76    --  Conversion to/from integers
  77
  78    function To_Address (Value : Integer_Address) return Address is
  79    begin
  80       return Address (Value);
  81    end To_Address;
  82
  83    function To_Integer (Value : Address) return Integer_Address is
  84    begin
  85       return Integer_Address (Value);
  86    end To_Integer;
  87
  88 end System.Storage_Elements;