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) 1992,1993,1994 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 Left + To_Address (Right);
49 function "+" (Left : Storage_Offset; Right : Address) return Address is
51 return To_Address (Left) + Right;
54 function "-" (Left : Address; Right : Storage_Offset) return Address is
56 return Left - To_Address (Right);
59 function "-" (Left, Right : Address) return Storage_Offset is
61 return To_Offset (Left - Right);
64 function "mod" (Left : Address; Right : Storage_Offset)
65 return Storage_Offset is
68 return Storage_Offset (Address'(Left mod Address (Right)));
70 return -Storage_Offset (Address'(Left mod Address (-Right)));
74 -- Conversion to/from integers
76 function To_Address (Value : Integer_Address) return Address is
78 return Address (Value);
81 function To_Integer (Value : Address) return Integer_Address is
83 return Integer_Address (Value);
86 end System.Storage_Elements;