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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT COMPILER COMPONENTS --
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4 -- --
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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 --
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6 -- --
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7 -- S p e c --
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8 -- --
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9 -- Copyright (C) 1992-2017, Free Software Foundation, Inc. --
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10 -- --
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11 -- This specification is derived from the Ada Reference Manual for use with --
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12 -- GNAT. The copyright notice above, and the license provisions that follow --
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13 -- apply solely to the contents of the part following the private keyword. --
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14 -- --
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15 -- GNAT is free software; you can redistribute it and/or modify it under --
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16 -- terms of the GNU General Public License as published by the Free Soft- --
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17 -- ware Foundation; either version 3, or (at your option) any later ver- --
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18 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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19 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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20 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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21 -- --
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22 -- As a special exception under Section 7 of GPL version 3, you are granted --
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23 -- additional permissions described in the GCC Runtime Library Exception, --
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24 -- version 3.1, as published by the Free Software Foundation. --
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25 -- --
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26 -- You should have received a copy of the GNU General Public License and --
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27 -- a copy of the GCC Runtime Library Exception along with this program; --
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28 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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29 -- <http://www.gnu.org/licenses/>. --
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30 -- --
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31 -- GNAT was originally developed by the GNAT team at New York University. --
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32 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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33 -- --
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34 ------------------------------------------------------------------------------
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35
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36 generic
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37 type Object (<>) is limited private;
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38
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39 package System.Address_To_Access_Conversions is
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40 pragma Preelaborate;
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41
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42 pragma Compile_Time_Warning
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43 (Object'Unconstrained_Array,
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44 "Object is unconstrained array type" & ASCII.LF &
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45 "To_Pointer results may not have bounds");
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46
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47 type Object_Pointer is access all Object;
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48 for Object_Pointer'Size use Standard'Address_Size;
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49
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50 pragma No_Strict_Aliasing (Object_Pointer);
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51 -- Strictly speaking, this routine should not be used to generate pointers
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52 -- to other than proper values of the proper type, but in practice, this
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53 -- is done all the time. This pragma stops the compiler from doing some
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54 -- optimizations that may cause unexpected results based on the assumption
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55 -- of no strict aliasing.
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56
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57 function To_Pointer (Value : Address) return Object_Pointer;
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58 function To_Address (Value : Object_Pointer) return Address;
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59
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60 pragma Import (Intrinsic, To_Pointer);
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61 pragma Import (Intrinsic, To_Address);
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62
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63 end System.Address_To_Access_Conversions;
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