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) 1992-2007, 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, 51 Franklin Street, Fifth Floor, --
20 -- Boston, MA 02110-1301, 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 pragma Warnings (Off);
38 with Ada.Unchecked_Conversion;
40 package body System.Storage_Elements is
42 pragma Suppress (All_Checks);
44 function To_Address is
45 new Ada.Unchecked_Conversion (Storage_Offset, Address);
47 new Ada.Unchecked_Conversion (Address, Storage_Offset);
49 -- Conversion to/from integers
51 -- These functions must be place first because they are inlined_always
52 -- and are used and inlined in other subprograms defined in this unit.
54 function To_Integer (Value : Address) return Integer_Address is
56 return Integer_Address (Value);
59 function To_Address (Value : Integer_Address) return Address is
61 return Address (Value);
66 function "+" (Left : Address; Right : Storage_Offset) return Address is
68 return To_Address (To_Integer (Left) + To_Integer (To_Address (Right)));
71 function "+" (Left : Storage_Offset; Right : Address) return Address is
73 return To_Address (To_Integer (To_Address (Left)) + To_Integer (Right));
76 function "-" (Left : Address; Right : Storage_Offset) return Address is
78 return To_Address (To_Integer (Left) - To_Integer (To_Address (Right)));
81 function "-" (Left, Right : Address) return Storage_Offset is
83 return To_Offset (To_Address (To_Integer (Left) - To_Integer (Right)));
88 Right : Storage_Offset) return Storage_Offset
93 (To_Integer (Left) mod Integer_Address (Right));
95 -- The negative case makes no sense since it is a case of a mod where
96 -- the left argument is unsigned and the right argument is signed. In
97 -- accordance with the (spirit of the) permission of RM 13.7.1(16),
98 -- we raise CE, and also include the zero case here. Yes, the RM says
99 -- PE, but this really is so obviously more like a constraint error.
102 raise Constraint_Error;
105 end System.Storage_Elements;