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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 -- I N T E R F A C E S . C . P O I N T E R S --
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6 -- --
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7 -- S p e c --
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8 -- --
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131
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9 -- Copyright (C) 1993-2018, Free Software Foundation, Inc. --
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111
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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 with System.Parameters;
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37
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38 generic
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39 type Index is (<>);
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40 type Element is private;
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41 type Element_Array is array (Index range <>) of aliased Element;
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42 Default_Terminator : Element;
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43
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44 package Interfaces.C.Pointers is
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45 pragma Preelaborate;
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46
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47 type Pointer is access all Element;
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48 for Pointer'Size use System.Parameters.ptr_bits;
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49
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50 pragma No_Strict_Aliasing (Pointer);
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51 -- We turn off any strict aliasing assumptions for the pointer type,
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52 -- since it is possible to create "improperly" aliased values.
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53
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54 function Value
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55 (Ref : Pointer;
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56 Terminator : Element := Default_Terminator) return Element_Array;
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57
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58 function Value
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59 (Ref : Pointer;
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60 Length : ptrdiff_t) return Element_Array;
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61
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62 Pointer_Error : exception;
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63
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64 --------------------------------
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65 -- C-style Pointer Arithmetic --
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66 --------------------------------
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67
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68 function "+" (Left : Pointer; Right : ptrdiff_t) return Pointer;
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69 function "+" (Left : ptrdiff_t; Right : Pointer) return Pointer;
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70 function "-" (Left : Pointer; Right : ptrdiff_t) return Pointer;
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71 function "-" (Left : Pointer; Right : Pointer) return ptrdiff_t;
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72
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73 procedure Increment (Ref : in out Pointer);
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74 procedure Decrement (Ref : in out Pointer);
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75
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76 pragma Convention (Intrinsic, "+");
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77 pragma Convention (Intrinsic, "-");
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78 pragma Convention (Intrinsic, Increment);
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79 pragma Convention (Intrinsic, Decrement);
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80
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81 function Virtual_Length
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82 (Ref : Pointer;
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83 Terminator : Element := Default_Terminator) return ptrdiff_t;
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84
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85 procedure Copy_Terminated_Array
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86 (Source : Pointer;
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87 Target : Pointer;
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88 Limit : ptrdiff_t := ptrdiff_t'Last;
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89 Terminator : Element := Default_Terminator);
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90
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91 procedure Copy_Array
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92 (Source : Pointer;
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93 Target : Pointer;
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94 Length : ptrdiff_t);
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95
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96 private
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97 pragma Inline ("+");
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98 pragma Inline ("-");
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99 pragma Inline (Decrement);
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100 pragma Inline (Increment);
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101
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102 end Interfaces.C.Pointers;
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