-- --
-- S p e c --
-- --
--- Copyright (C) 1992-2003 Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2005 Free Software Foundation, Inc. --
-- --
-- This specification is derived from the Ada Reference Manual for use with --
-- GNAT. The copyright notice above, and the license provisions that follow --
-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNAT; see file COPYING. If not, write --
--- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, USA. --
+-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
+-- Boston, MA 02110-1301, USA. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
type Object (<>) is limited private;
package System.Address_To_Access_Conversions is
-pragma Preelaborate (Address_To_Access_Conversions);
+ pragma Preelaborate;
+ pragma Elaborate_Body;
+ -- This pragma Elaborate_Body is there to ensure the requirement of what is
+ -- at the moment a dummy null body. The reason this null body is there is
+ -- that we used to have a real body, and it causes bootstrap problems with
+ -- old compilers if we try to remove the corresponding file.
pragma Compile_Time_Warning
(Object'Unconstrained_Array,
"Object is unconstrained array type" & ASCII.LF &
"To_Pointer results may not have bounds");
- xyz : Boolean := Object'Constrained;
+ -- Capture constrained status, suppressing warnings, since this is
+ -- an obsolescent feature to use Constrained in this way (RM J.4).
+
+ pragma Warnings (Off);
+ Xyz : Boolean := Object'Constrained;
+ pragma Warnings (On);
type Object_Pointer is access all Object;
for Object_Pointer'Size use Standard'Address_Size;
+ pragma No_Strict_Aliasing (Object_Pointer);
+ -- Strictly speaking, this routine should not be used to generate pointers
+ -- to other than proper values of the proper type, but in practice, this
+ -- is done all the time. This pragma stops the compiler from doing some
+ -- optimizations that may cause unexpected results based on the assumption
+ -- of no strict aliasing.
+
function To_Pointer (Value : Address) return Object_Pointer;
function To_Address (Value : Object_Pointer) return Address;
pragma Import (Intrinsic, To_Pointer);
pragma Import (Intrinsic, To_Address);
-private
- procedure Nothing; -- For now, until body is removed ???
end System.Address_To_Access_Conversions;