File : s-stoele.adb
------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
5 -- S Y S T E M . S T O R A G E _ E L E M E N T S --
-- --
-- B o d y --
-- --
-- $Revision: 1.8 $ --
10 -- --
-- Copyright (C) 1992,1993,1994 Free Software Foundation, Inc. --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- 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- --
-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
-- 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 --
-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
-- MA 02111-1307, USA. --
-- --
-- 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, --
-- this unit does not by itself cause the resulting executable to be --
-- covered by the GNU General Public License. This exception does not --
-- however invalidate any other reasons why the executable file might be --
-- covered by the GNU Public License. --
30 -- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
-- --
------------------------------------------------------------------------------
35
with Unchecked_Conversion;
package body System.Storage_Elements is
pragma Suppress (All_Checks);
40
function To_Address is new Unchecked_Conversion (Storage_Offset, Address);
function To_Offset is new Unchecked_Conversion (Address, Storage_Offset);
-- Address arithmetic
45
function "+" (Left : Address; Right : Storage_Offset) return Address is
begin
return Left + To_Address (Right);
end "+";
50
function "+" (Left : Storage_Offset; Right : Address) return Address is
begin
return To_Address (Left) + Right;
end "+";
55
function "-" (Left : Address; Right : Storage_Offset) return Address is
begin
return Left - To_Address (Right);
end "-";
60
function "-" (Left, Right : Address) return Storage_Offset is
begin
return To_Offset (Left - Right);
end "-";
65
function "mod" (Left : Address; Right : Storage_Offset)
return Storage_Offset is
begin
if Right >= 0 then
70 return Storage_Offset (Address'(Left mod Address (Right)));
else
return -Storage_Offset (Address'(Left mod Address (-Right)));
end if;
end "mod";
75
-- Conversion to/from integers
function To_Address (Value : Integer_Address) return Address is
begin
80 return Address (Value);
end To_Address;
function To_Integer (Value : Address) return Integer_Address is
begin
85 return Integer_Address (Value);
end To_Integer;
end System.Storage_Elements;