1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
5 -- S Y S T E M . A D D R E S S _ T O _ A C C E S S _ C O N V E R S I O N S --
9 -- Copyright (C) 1992-2006, Free Software Foundation, Inc. --
11 -- This specification is derived from the Ada Reference Manual for use with --
12 -- GNAT. The copyright notice above, and the license provisions that follow --
13 -- apply solely to the contents of the part following the private keyword. --
15 -- GNAT is free software; you can redistribute it and/or modify it under --
16 -- terms of the GNU General Public License as published by the Free Soft- --
17 -- ware Foundation; either version 2, or (at your option) any later ver- --
18 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
19 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
20 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
21 -- for more details. You should have received a copy of the GNU General --
22 -- Public License distributed with GNAT; see file COPYING. If not, write --
23 -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
24 -- Boston, MA 02110-1301, USA. --
26 -- As a special exception, if other files instantiate generics from this --
27 -- unit, or you link this unit with other files to produce an executable, --
28 -- this unit does not by itself cause the resulting executable to be --
29 -- covered by the GNU General Public License. This exception does not --
30 -- however invalidate any other reasons why the executable file might be --
31 -- covered by the GNU Public License. --
33 -- GNAT was originally developed by the GNAT team at New York University. --
34 -- Extensive contributions were provided by Ada Core Technologies Inc. --
36 ------------------------------------------------------------------------------
39 type Object
(<>) is limited private;
41 package System
.Address_To_Access_Conversions
is
43 pragma Elaborate_Body
;
44 -- This pragma Elaborate_Body is there to ensure the requirement of what is
45 -- at the moment a dummy null body. The reason this null body is there is
46 -- that we used to have a real body, and it causes bootstrap problems with
47 -- old compilers if we try to remove the corresponding file.
49 pragma Compile_Time_Warning
50 (Object
'Unconstrained_Array,
51 "Object is unconstrained array type" & ASCII
.LF
&
52 "To_Pointer results may not have bounds");
54 -- Capture constrained status, suppressing warnings, since this is
55 -- an obsolescent feature to use Constrained in this way (RM J.4).
57 pragma Warnings
(Off
);
58 Xyz
: Boolean := Object
'Constrained;
61 type Object_Pointer
is access all Object
;
62 for Object_Pointer
'Size use Standard
'Address_Size;
64 pragma No_Strict_Aliasing
(Object_Pointer
);
65 -- Strictly speaking, this routine should not be used to generate pointers
66 -- to other than proper values of the proper type, but in practice, this
67 -- is done all the time. This pragma stops the compiler from doing some
68 -- optimizations that may cause unexpected results based on the assumption
69 -- of no strict aliasing.
71 function To_Pointer
(Value
: Address
) return Object_Pointer
;
72 function To_Address
(Value
: Object_Pointer
) return Address
;
74 pragma Import
(Intrinsic
, To_Pointer
);
75 pragma Import
(Intrinsic
, To_Address
);
77 end System
.Address_To_Access_Conversions
;