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 --
10 -- Copyright (C) 1992,1993,1994 Free Software Foundation, Inc. --
12 -- GNAT is free software; you can redistribute it and/or modify it under --
13 -- terms of the GNU General Public License as published by the Free Soft- --
14 -- ware Foundation; either version 2, or (at your option) any later ver- --
15 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
16 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
17 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
18 -- for more details. You should have received a copy of the GNU General --
19 -- Public License distributed with GNAT; see file COPYING. If not, write --
20 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
21 -- MA 02111-1307, USA. --
23 -- As a special exception, if other files instantiate generics from this --
24 -- unit, or you link this unit with other files to produce an executable, --
25 -- this unit does not by itself cause the resulting executable to be --
26 -- covered by the GNU General Public License. This exception does not --
27 -- however invalidate any other reasons why the executable file might be --
28 -- covered by the GNU Public License. --
30 -- GNAT was originally developed by the GNAT team at New York University. --
31 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
33 ------------------------------------------------------------------------------
35 with Unchecked_Conversion;
36 package body System.Storage_Elements is
38 pragma Suppress (All_Checks);
40 function To_Address is new Unchecked_Conversion (Storage_Offset, Address);
41 function To_Offset is new Unchecked_Conversion (Address, Storage_Offset);
45 function "+" (Left : Address; Right : Storage_Offset) return Address is
47 return Left + To_Address (Right);
50 function "+" (Left : Storage_Offset; Right : Address) return Address is
52 return To_Address (Left) + Right;
55 function "-" (Left : Address; Right : Storage_Offset) return Address is
57 return Left - To_Address (Right);
60 function "-" (Left, Right : Address) return Storage_Offset is
62 return To_Offset (Left - Right);
65 function "mod" (Left : Address; Right : Storage_Offset)
66 return Storage_Offset is
69 return Storage_Offset (Address'(Left mod Address (Right)));
71 return -Storage_Offset (Address'(Left mod Address (-Right)));
75 -- Conversion to/from integers
77 function To_Address (Value : Integer_Address) return Address is
79 return Address (Value);
82 function To_Integer (Value : Address) return Integer_Address is
84 return Integer_Address (Value);
87 end System.Storage_Elements;