gcc/ada/libgnat/s-widuns.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUN-TIME COMPONENTS                         --
   4 --                                                                          --
   5 --                       S Y S T E M . W I D _ U N S                        --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2024, Free Software Foundation, Inc.         --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 3,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
  17 --                                                                          --
  18 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
  21 --                                                                          --
  22 -- You should have received a copy of the GNU General Public License and    --
  23 -- a copy of the GCC Runtime Library Exception along with this program;     --
  24 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  25 -- <http://www.gnu.org/licenses/>.                                          --
  26 --                                                                          --
  27 -- GNAT was originally developed  by the GNAT team at  New York University. --
  28 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  29 --                                                                          --
  30 ------------------------------------------------------------------------------
  31
  32 --  Width attribute for modular integers up to Integer
  33
  34 --  Preconditions in this unit are meant for analysis only, not for run-time
  35 --  checking, so that the expected exceptions are raised. This is enforced by
  36 --  setting the corresponding assertion policy to Ignore. Postconditions and
  37 --  contract cases should not be executed at runtime as well, in order not to
  38 --  slow down the execution of these functions.
  39
  40 pragma Assertion_Policy (Pre            => Ignore,
  41                          Post           => Ignore,
  42                          Contract_Cases => Ignore,
  43                          Ghost          => Ignore);
  44
  45 with System.Width_U;
  46 with System.Unsigned_Types;
  47
  48 package System.Wid_Uns
  49   with SPARK_Mode
  50 is
  51    subtype Unsigned is Unsigned_Types.Unsigned;
  52
  53    package Width_Uns is new Width_U (Unsigned);
  54
  55    function Width_Unsigned (Lo, Hi : Unsigned) return Natural
  56      renames Width_Uns.Width;
  57
  58 end System.Wid_Uns;