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1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT COMPILER COMPONENTS --
4 -- --
5 -- S Y S T E M . S T O R A G E _ E L E M E N T S --
6 -- --
7 -- B o d y --
8 -- --
9 -- Copyright (C) 1992-2009, Free Software Foundation, Inc. --
10 -- --
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 3, 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. --
17 -- --
18 -- As a special exception under Section 7 of GPL version 3, you are granted --
19 -- additional permissions described in the GCC Runtime Library Exception, --
20 -- version 3.1, as published by the Free Software Foundation. --
21 -- --
22 -- You should have received a copy of the GNU General Public License and --
23 -- a copy of the GCC Runtime Library Exception along with this program; --
24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
25 -- <http://www.gnu.org/licenses/>. --
26 -- --
27 -- GNAT was originally developed by the GNAT team at New York University. --
28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
29 -- --
30 ------------------------------------------------------------------------------
32 pragma Compiler_Unit;
34 with Ada.Unchecked_Conversion;
36 package body System.Storage_Elements is
38 pragma Suppress (All_Checks);
40 -- Conversion to/from address
42 -- Note qualification below of To_Address to avoid ambiguities on VMS
44 function To_Address is
45 new Ada.Unchecked_Conversion (Storage_Offset, Address);
46 function To_Offset is
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 ----------------
55 -- To_Address --
56 ----------------
58 function To_Address (Value : Integer_Address) return Address is
59 begin
60 return Address (Value);
61 end To_Address;
63 ----------------
64 -- To_Integer --
65 ----------------
67 function To_Integer (Value : Address) return Integer_Address is
68 begin
69 return Integer_Address (Value);
70 end To_Integer;
72 -- Address arithmetic
74 ---------
75 -- "+" --
76 ---------
78 function "+" (Left : Address; Right : Storage_Offset) return Address is
79 begin
80 return Storage_Elements.To_Address
81 (To_Integer (Left) + To_Integer (To_Address (Right)));
82 end "+";
84 function "+" (Left : Storage_Offset; Right : Address) return Address is
85 begin
86 return Storage_Elements.To_Address
87 (To_Integer (To_Address (Left)) + To_Integer (Right));
88 end "+";
90 ---------
91 -- "-" --
92 ---------
94 function "-" (Left : Address; Right : Storage_Offset) return Address is
95 begin
96 return Storage_Elements.To_Address
97 (To_Integer (Left) - To_Integer (To_Address (Right)));
98 end "-";
100 function "-" (Left, Right : Address) return Storage_Offset is
101 begin
102 return To_Offset (Storage_Elements.To_Address
103 (To_Integer (Left) - To_Integer (Right)));
104 end "-";
106 -----------
107 -- "mod" --
108 -----------
110 function "mod"
111 (Left : Address;
112 Right : Storage_Offset) return Storage_Offset
114 begin
115 if Right > 0 then
116 return Storage_Offset
117 (To_Integer (Left) mod Integer_Address (Right));
119 -- The negative case makes no sense since it is a case of a mod where
120 -- the left argument is unsigned and the right argument is signed. In
121 -- accordance with the (spirit of the) permission of RM 13.7.1(16),
122 -- we raise CE, and also include the zero case here. Yes, the RM says
123 -- PE, but this really is so obviously more like a constraint error.
125 else
126 raise Constraint_Error;
127 end if;
128 end "mod";
130 end System.Storage_Elements;