projects / thirdparty / gcc.git / blame
| Commit | Line | Data |
|---|---|---|
| cacbc350 RK |
1 | ------------------------------------------------------------------------------ |
| 2 | -- -- | |
| 3 | -- GNAT COMPILER COMPONENTS -- | |
| 4 | -- -- | |
| 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 -- | |
| 6 | -- -- | |
| 7 | -- S p e c -- | |
| 8 | -- -- | |
| 748086b7 | 9 | -- Copyright (C) 1992-2009, Free Software Foundation, Inc. -- |
| 24377ae4 RD |
10 | -- -- |
| 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. -- | |
| 14 | -- -- | |
| 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- -- | |
| 748086b7 | 17 | -- ware Foundation; either version 3, or (at your option) any later ver- -- |
| 24377ae4 RD |
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 -- | |
| 748086b7 JJ |
20 | -- or FITNESS FOR A PARTICULAR PURPOSE. -- |
| 21 | -- -- | |
| 22 | -- As a special exception under Section 7 of GPL version 3, you are granted -- | |
| 23 | -- additional permissions described in the GCC Runtime Library Exception, -- | |
| 24 | -- version 3.1, as published by the Free Software Foundation. -- | |
| 25 | -- -- | |
| 26 | -- You should have received a copy of the GNU General Public License and -- | |
| 27 | -- a copy of the GCC Runtime Library Exception along with this program; -- | |
| 28 | -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- | |
| 29 | -- <http://www.gnu.org/licenses/>. -- | |
| 24377ae4 RD |
30 | -- -- |
| 31 | -- GNAT was originally developed by the GNAT team at New York University. -- | |
| 1f02b6af | 32 | -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
| cacbc350 RK |
33 | -- -- |
| 34 | ------------------------------------------------------------------------------ | |
| 35 | ||
| 36 | generic | |
| 37 | type Object (<>) is limited private; | |
| 38 | ||
| 39 | package System.Address_To_Access_Conversions is | |
| 009186e0 AC |
40 | pragma Preelaborate; |
| 41 | pragma Elaborate_Body; | |
| 42 | -- This pragma Elaborate_Body is there to ensure the requirement of what is | |
| 43 | -- at the moment a dummy null body. The reason this null body is there is | |
| 44 | -- that we used to have a real body, and it causes bootstrap problems with | |
| 45 | -- old compilers if we try to remove the corresponding file. | |
| 984a64bc | 46 | |
| fbf5a39b AC |
47 | pragma Compile_Time_Warning |
| 48 | (Object'Unconstrained_Array, | |
| 49 | "Object is unconstrained array type" & ASCII.LF & | |
| 50 | "To_Pointer results may not have bounds"); | |
| 51 | ||
| 5f3ab6fb AC |
52 | -- Capture constrained status, suppressing warnings, since this is |
| 53 | -- an obsolescent feature to use Constrained in this way (RM J.4). | |
| 54 | ||
| 55 | pragma Warnings (Off); | |
| 56 | Xyz : Boolean := Object'Constrained; | |
| 57 | pragma Warnings (On); | |
| fbf5a39b | 58 | |
| cacbc350 RK |
59 | type Object_Pointer is access all Object; |
| 60 | for Object_Pointer'Size use Standard'Address_Size; | |
| 61 | ||
| 38d7a13a EB |
62 | pragma No_Strict_Aliasing (Object_Pointer); |
| 63 | -- Strictly speaking, this routine should not be used to generate pointers | |
| 64 | -- to other than proper values of the proper type, but in practice, this | |
| 65 | -- is done all the time. This pragma stops the compiler from doing some | |
| 66 | -- optimizations that may cause unexpected results based on the assumption | |
| 67 | -- of no strict aliasing. | |
| 68 | ||
| cacbc350 RK |
69 | function To_Pointer (Value : Address) return Object_Pointer; |
| 70 | function To_Address (Value : Object_Pointer) return Address; | |
| 71 | ||
| fbf5a39b AC |
72 | pragma Import (Intrinsic, To_Pointer); |
| 73 | pragma Import (Intrinsic, To_Address); | |
| cacbc350 RK |
74 | |
| 75 | end System.Address_To_Access_Conversions; |