78 lines
4.3 KiB
Ada
78 lines
4.3 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- 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 --
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-- --
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-- S p e c --
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-- --
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-- Copyright (C) 1992-2006, Free Software Foundation, Inc. --
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-- --
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-- This specification is derived from the Ada Reference Manual for use with --
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-- GNAT. The copyright notice above, and the license provisions that follow --
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-- apply solely to the contents of the part following the private keyword. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 2, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNAT; see file COPYING. If not, write --
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-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
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-- Boston, MA 02110-1301, USA. --
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-- --
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-- As a special exception, if other files instantiate generics from this --
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-- unit, or you link this unit with other files to produce an executable, --
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-- this unit does not by itself cause the resulting executable to be --
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-- covered by the GNU General Public License. This exception does not --
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-- however invalidate any other reasons why the executable file might be --
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-- covered by the GNU Public License. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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generic
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type Object (<>) is limited private;
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package System.Address_To_Access_Conversions is
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pragma Preelaborate;
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pragma Elaborate_Body;
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-- This pragma Elaborate_Body is there to ensure the requirement of what is
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-- at the moment a dummy null body. The reason this null body is there is
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-- that we used to have a real body, and it causes bootstrap problems with
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-- old compilers if we try to remove the corresponding file.
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pragma Compile_Time_Warning
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(Object'Unconstrained_Array,
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"Object is unconstrained array type" & ASCII.LF &
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"To_Pointer results may not have bounds");
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-- Capture constrained status, suppressing warnings, since this is
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-- an obsolescent feature to use Constrained in this way (RM J.4).
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pragma Warnings (Off);
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Xyz : Boolean := Object'Constrained;
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pragma Warnings (On);
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type Object_Pointer is access all Object;
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for Object_Pointer'Size use Standard'Address_Size;
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pragma No_Strict_Aliasing (Object_Pointer);
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-- Strictly speaking, this routine should not be used to generate pointers
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-- to other than proper values of the proper type, but in practice, this
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-- is done all the time. This pragma stops the compiler from doing some
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-- optimizations that may cause unexpected results based on the assumption
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-- of no strict aliasing.
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function To_Pointer (Value : Address) return Object_Pointer;
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function To_Address (Value : Object_Pointer) return Address;
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pragma Import (Intrinsic, To_Pointer);
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pragma Import (Intrinsic, To_Address);
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end System.Address_To_Access_Conversions;
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