1 ------------------------------------------------------------------------------
3 -- 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 --
11 -- Copyright (C) 1992,1993,1994 Free Software Foundation, Inc. --
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. --
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. --
31 -- GNAT was originally developed by the GNAT team at New York University. --
32 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
34 ------------------------------------------------------------------------------
36 with Unchecked_Conversion;
37 package body System.Storage_Elements is
39 pragma Suppress (All_Checks);
41 function To_Address is new Unchecked_Conversion (Storage_Offset, Address);
42 function To_Offset is new Unchecked_Conversion (Address, Storage_Offset);
46 function "+" (Left : Address; Right : Storage_Offset) return Address is
48 return Left + To_Address (Right);
51 function "+" (Left : Storage_Offset; Right : Address) return Address is
53 return To_Address (Left) + Right;
56 function "-" (Left : Address; Right : Storage_Offset) return Address is
58 return Left - To_Address (Right);
61 function "-" (Left, Right : Address) return Storage_Offset is
63 return To_Offset (Left - Right);
66 function "mod" (Left : Address; Right : Storage_Offset)
67 return Storage_Offset is
70 return Storage_Offset (Address'(Left mod Address (Right)));
72 return -Storage_Offset (Address'(Left mod Address (-Right)));
76 -- Conversion to/from integers
78 function To_Address (Value : Integer_Address) return Address is
80 return Address (Value);
83 function To_Integer (Value : Address) return Integer_Address is
85 return Integer_Address (Value);
88 end System.Storage_Elements;