------------------------------------------------------------------------------ | |

-- -- | |

-- 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) 1992-2014, 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 Compiler_Unit_Warning; | |

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; | |

pragma Universal_Aliasing (Packed_Byte); | |

for Packed_Byte'Size use 8; | |

-- Component type for Packed_Bytes1, Packed_Bytes2 and Packed_Byte4 arrays. | |

-- As this type is used by the compiler to implement operations on user | |

-- packed array, it needs to be able to alias any type. | |

type Packed_Bytes1 is array (Natural range <>) of aliased 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 using these types, why discombobulate them? | |

subtype Packed_Bytes is Packed_Bytes4; | |

subtype Packed_Bytes_Unaligned is Packed_Bytes1; | |

end System.Unsigned_Types; |