| 1 |
706 |
jeremybenn |
------------------------------------------------------------------------------
|
| 2 |
|
|
-- --
|
| 3 |
|
|
-- GNAT RUN-TIME COMPONENTS --
|
| 4 |
|
|
-- --
|
| 5 |
|
|
-- S Y S T E M . W I D _ E N U M --
|
| 6 |
|
|
-- --
|
| 7 |
|
|
-- S p e c --
|
| 8 |
|
|
-- --
|
| 9 |
|
|
-- Copyright (C) 1992-2009, 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 |
|
|
-- This package contains the routine used for Enumeration_Type'Width
|
| 33 |
|
|
|
| 34 |
|
|
package System.Wid_Enum is
|
| 35 |
|
|
pragma Pure;
|
| 36 |
|
|
|
| 37 |
|
|
function Width_Enumeration_8
|
| 38 |
|
|
(Names : String;
|
| 39 |
|
|
Indexes : System.Address;
|
| 40 |
|
|
Lo, Hi : Natural)
|
| 41 |
|
|
return Natural;
|
| 42 |
|
|
-- Used to compute Enum'Width where Enum is some enumeration subtype
|
| 43 |
|
|
-- other than those defined in package Standard. Names is a string with
|
| 44 |
|
|
-- a lower bound of 1 containing the characters of all the enumeration
|
| 45 |
|
|
-- literals concatenated together in sequence. Indexes is the address
|
| 46 |
|
|
-- of an array of type array (0 .. N) of Natural_8, where N is the
|
| 47 |
|
|
-- number of enumeration literals in the type. The Indexes values are
|
| 48 |
|
|
-- the starting subscript of each enumeration literal, indexed by Pos
|
| 49 |
|
|
-- values, with an extra entry at the end containing Names'Length + 1.
|
| 50 |
|
|
-- The reason that Indexes is passed by address is that the actual type
|
| 51 |
|
|
-- is created on the fly by the expander.
|
| 52 |
|
|
--
|
| 53 |
|
|
-- Lo and Hi are the Pos values of the lower and upper bounds of the
|
| 54 |
|
|
-- subtype. The result is the value of Width, i.e. the maximum value
|
| 55 |
|
|
-- of the length of any enumeration literal in the given range.
|
| 56 |
|
|
|
| 57 |
|
|
function Width_Enumeration_16
|
| 58 |
|
|
(Names : String;
|
| 59 |
|
|
Indexes : System.Address;
|
| 60 |
|
|
Lo, Hi : Natural)
|
| 61 |
|
|
return Natural;
|
| 62 |
|
|
-- Identical to Width_Enumeration_8 except that it handles types
|
| 63 |
|
|
-- using array (0 .. Num) of Natural_16 for the Indexes table.
|
| 64 |
|
|
|
| 65 |
|
|
function Width_Enumeration_32
|
| 66 |
|
|
(Names : String;
|
| 67 |
|
|
Indexes : System.Address;
|
| 68 |
|
|
Lo, Hi : Natural)
|
| 69 |
|
|
return Natural;
|
| 70 |
|
|
-- Identical to Width_Enumeration_8 except that it handles types
|
| 71 |
|
|
-- using array (0 .. Num) of Natural_32 for the Indexes table.
|
| 72 |
|
|
|
| 73 |
|
|
end System.Wid_Enum;
|
