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------------------------------------------------------------------------------
-- --
-- GNAT RUNTIME COMPONENTS --
-- --
-- S Y S T E M . U N S I G N E D _ T Y P E S --
-- --
-- S p e c --
-- --
-- --
-- Copyright (C) 1992-2001 Free Software Foundation, Inc. --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- ware Foundation; either version 2, or (at your option) any later ver- --
-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNAT; see file COPYING. If not, write --
-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
-- MA 02111-1307, USA. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- this unit does not by itself cause the resulting executable to be --
-- covered by the GNU General Public License. This exception does not --
-- however invalidate any other reasons why the executable file might be --
-- covered by the GNU Public License. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
-- --
------------------------------------------------------------------------------
-- This package contains definitions of standard unsigned types that
-- correspond in size to the standard signed types declared in Standard.
-- and (unlike the types in Interfaces have corresponding names). It
-- also contains some related definitions for other specialized types
-- used by the compiler in connection with packed array types.
package System.Unsigned_Types is
pragma Pure (Unsigned_Types);
type Short_Short_Unsigned is mod 2 ** Short_Short_Integer'Size;
type Short_Unsigned is mod 2 ** Short_Integer'Size;
type Unsigned is mod 2 ** Integer'Size;
type Long_Unsigned is mod 2 ** Long_Integer'Size;
type Long_Long_Unsigned is mod 2 ** Long_Long_Integer'Size;
type Float_Unsigned is mod 2 ** Float'Size;
-- Used in the implementation of Is_Negative intrinsic (see Exp_Intr)
type Packed_Byte is mod 2 ** 8;
for Packed_Byte'Size use 8;
-- Component type for Packed_Butes array
type Packed_Bytes1 is array (Natural range <>) of Packed_Byte;
for Packed_Bytes1'Alignment use 1;
-- This is the type used to implement packed arrays where no alignment
-- is required. This includes the cases of 1,2,4 (where we use direct
-- masking operations), and all odd component sizes (where the clusters
-- are not aligned anyway, see, e.g. System.Pack_07 in file s-pack07
-- for details.
type Packed_Bytes2 is new Packed_Bytes1;
for Packed_Bytes2'Alignment use 2;
-- This is the type used to implement packed arrays where an alignment
-- of 2 is helpful for maximum efficiency of the get and set routines
-- in the corresponding library unit. This is true of all component
-- sizes that are even but not divisible by 4 (other than 2 for which
-- we use direct masking operations). In such cases, the clusters can
-- be assumed to be 2-byte aligned if the array is aligned. See for
-- example System.Pack_10 in file s-pack10).
type Packed_Bytes4 is new Packed_Bytes1;
for Packed_Bytes4'Alignment use Integer'Min (4, Standard'Maximum_Alignment);
-- This is the type used to implement packed arrays where an alignment
-- of 4 is helpful for maximum efficiency of the get and set routines
-- in the corresponding library unit. This is true of all component
-- sizes that are divisible by 4 (other than powers of 2, which are
-- either handled by direct masking or not packed at all). In such cases
-- the clusters can be assumed to be 4-byte aligned if the array is
-- aligned (see System.Pack_12 in file s-pack12 as an example).
type Bits_1 is mod 2**1;
type Bits_2 is mod 2**2;
type Bits_4 is mod 2**4;
-- Types used for packed array conversions
subtype Bytes_F is Packed_Bytes4 (1 .. Float'Size / 8);
-- Type used in implementation of Is_Negative instrinsic (see Exp_Intr)
function Shift_Left
(Value : Short_Short_Unsigned;
Amount : Natural)
return Short_Short_Unsigned;
function Shift_Right
(Value : Short_Short_Unsigned;
Amount : Natural)
return Short_Short_Unsigned;
function Shift_Right_Arithmetic
(Value : Short_Short_Unsigned;
Amount : Natural)
return Short_Short_Unsigned;
function Rotate_Left
(Value : Short_Short_Unsigned;
Amount : Natural)
return Short_Short_Unsigned;
function Rotate_Right
(Value : Short_Short_Unsigned;
Amount : Natural)
return Short_Short_Unsigned;
function Shift_Left
(Value : Short_Unsigned;
Amount : Natural)
return Short_Unsigned;
function Shift_Right
(Value : Short_Unsigned;
Amount : Natural)
return Short_Unsigned;
function Shift_Right_Arithmetic
(Value : Short_Unsigned;
Amount : Natural)
return Short_Unsigned;
function Rotate_Left
(Value : Short_Unsigned;
Amount : Natural)
return Short_Unsigned;
function Rotate_Right
(Value : Short_Unsigned;
Amount : Natural)
return Short_Unsigned;
function Shift_Left
(Value : Unsigned;
Amount : Natural)
return Unsigned;
function Shift_Right
(Value : Unsigned;
Amount : Natural)
return Unsigned;
function Shift_Right_Arithmetic
(Value : Unsigned;
Amount : Natural)
return Unsigned;
function Rotate_Left
(Value : Unsigned;
Amount : Natural)
return Unsigned;
function Rotate_Right
(Value : Unsigned;
Amount : Natural)
return Unsigned;
function Shift_Left
(Value : Long_Unsigned;
Amount : Natural)
return Long_Unsigned;
function Shift_Right
(Value : Long_Unsigned;
Amount : Natural)
return Long_Unsigned;
function Shift_Right_Arithmetic
(Value : Long_Unsigned;
Amount : Natural)
return Long_Unsigned;
function Rotate_Left
(Value : Long_Unsigned;
Amount : Natural)
return Long_Unsigned;
function Rotate_Right
(Value : Long_Unsigned;
Amount : Natural)
return Long_Unsigned;
function Shift_Left
(Value : Long_Long_Unsigned;
Amount : Natural)
return Long_Long_Unsigned;
function Shift_Right
(Value : Long_Long_Unsigned;
Amount : Natural)
return Long_Long_Unsigned;
function Shift_Right_Arithmetic
(Value : Long_Long_Unsigned;
Amount : Natural)
return Long_Long_Unsigned;
function Rotate_Left
(Value : Long_Long_Unsigned;
Amount : Natural)
return Long_Long_Unsigned;
function Rotate_Right
(Value : Long_Long_Unsigned;
Amount : Natural)
return Long_Long_Unsigned;
pragma Import (Intrinsic, Shift_Left);
pragma Import (Intrinsic, Shift_Right);
pragma Import (Intrinsic, Shift_Right_Arithmetic);
pragma Import (Intrinsic, Rotate_Left);
pragma Import (Intrinsic, Rotate_Right);
-- The following definitions are obsolsecent. They were needed by the
-- previous version of the compiler and runtime, but are not needed
-- by the current version. We retain them to help with bootstrap path
-- problems. Also they seem harmless, and if any user programs have
-- been (rather improperly) using these types, why discombobulate them?
subtype Packed_Bytes is Packed_Bytes4;
subtype Packed_Bytes_Unaligned is Packed_Bytes1;
end System.Unsigned_Types;
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