+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- 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 --
--- --
--- $Revision: 1.1.16.1 $
--- --
--- 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. --
--- Extensive contributions were provided by Ada Core Technologies Inc. --
--- --
-------------------------------------------------------------------------------
-
--- 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 only by the expander.
-
-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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