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-------------------------------------------------------------------------------
--- --
--- GNAT RUN-TIME 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) 1992-2009, 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 3, 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. --
--- --
--- As a special exception under Section 7 of GPL version 3, you are granted --
--- additional permissions described in the GCC Runtime Library Exception, --
--- version 3.1, as published by the Free Software Foundation. --
--- --
--- You should have received a copy of the GNU General Public License and --
--- a copy of the GCC Runtime Library Exception along with this program; --
--- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
--- <http://www.gnu.org/licenses/>. --
--- --
--- 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 by the compiler in connection with packed array types.
-
-pragma Warnings (Off);
-pragma Compiler_Unit;
-pragma Warnings (On);
-
-package System.Unsigned_Types is
- pragma Pure;
-
- 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_Bytes array
-
- type Packed_Bytes1 is array (Natural range <>) of Packed_Byte;
- for Packed_Bytes1'Alignment use 1;
- for Packed_Bytes1'Component_Size use Packed_Byte'Size;
- -- 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 Integer'Min (2, Standard'Maximum_Alignment);
- -- This is the type used to implement packed arrays where an alignment
- -- of 2 (is possible) 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 (if possible) 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 intrinsic (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 obsolescent. 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;