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 --
9 -- Copyright (C) 1992-2004 Free Software Foundation, Inc. --
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, 59 Temple Place - Suite 330, Boston, --
20 -- MA 02111-1307, USA. --
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. --
29 -- GNAT was originally developed by the GNAT team at New York University. --
30 -- Extensive contributions were provided by Ada Core Technologies Inc. --
32 ------------------------------------------------------------------------------
34 with Unchecked_Conversion;
35 package body System.Storage_Elements is
37 pragma Suppress (All_Checks);
39 function To_Address is new Unchecked_Conversion (Storage_Offset, Address);
40 function To_Offset is new Unchecked_Conversion (Address, Storage_Offset);
44 function "+" (Left : Address; Right : Storage_Offset) return Address is
46 return To_Address (To_Integer (Left) + To_Integer (To_Address (Right)));
49 function "+" (Left : Storage_Offset; Right : Address) return Address is
51 return To_Address (To_Integer (To_Address (Left)) + To_Integer (Right));
54 function "-" (Left : Address; Right : Storage_Offset) return Address is
56 return To_Address (To_Integer (Left) - To_Integer (To_Address (Right)));
59 function "-" (Left, Right : Address) return Storage_Offset is
61 return To_Offset (To_Address (To_Integer (Left) - To_Integer (Right)));
64 function "mod" (Left : Address; Right : Storage_Offset)
65 return Storage_Offset is
69 (To_Integer (Left) mod Integer_Address (Right));
71 return -Storage_Offset
72 (To_Integer (Left) mod Integer_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;