211 lines
8.6 KiB
Ada
211 lines
8.6 KiB
Ada
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------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME COMPONENTS --
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-- --
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-- S Y S T E M . U N S I G N E D _ T Y P E S --
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-- --
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-- S p e c --
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-- --
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-- Copyright (C) 1992-2009, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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-- This package contains definitions of standard unsigned types that
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-- correspond in size to the standard signed types declared in Standard,
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-- and (unlike the types in Interfaces) have corresponding names. It
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-- also contains some related definitions for other specialized types
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-- used by the compiler in connection with packed array types.
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pragma Warnings (Off);
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pragma Compiler_Unit;
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pragma Warnings (On);
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package System.Unsigned_Types is
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pragma Pure;
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type Short_Short_Unsigned is mod 2 ** Short_Short_Integer'Size;
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type Short_Unsigned is mod 2 ** Short_Integer'Size;
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type Unsigned is mod 2 ** Integer'Size;
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type Long_Unsigned is mod 2 ** Long_Integer'Size;
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type Long_Long_Unsigned is mod 2 ** Long_Long_Integer'Size;
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type Float_Unsigned is mod 2 ** Float'Size;
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-- Used in the implementation of Is_Negative intrinsic (see Exp_Intr)
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type Packed_Byte is mod 2 ** 8;
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for Packed_Byte'Size use 8;
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-- Component type for Packed_Bytes array
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type Packed_Bytes1 is array (Natural range <>) of Packed_Byte;
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for Packed_Bytes1'Alignment use 1;
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for Packed_Bytes1'Component_Size use Packed_Byte'Size;
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-- This is the type used to implement packed arrays where no alignment
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-- is required. This includes the cases of 1,2,4 (where we use direct
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-- masking operations), and all odd component sizes (where the clusters
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-- are not aligned anyway, see, e.g. System.Pack_07 in file s-pack07
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-- for details.
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type Packed_Bytes2 is new Packed_Bytes1;
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for Packed_Bytes2'Alignment use Integer'Min (2, Standard'Maximum_Alignment);
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-- This is the type used to implement packed arrays where an alignment
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-- of 2 (is possible) is helpful for maximum efficiency of the get and
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-- set routines in the corresponding library unit. This is true of all
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-- component sizes that are even but not divisible by 4 (other than 2 for
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-- which we use direct masking operations). In such cases, the clusters
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-- can be assumed to be 2-byte aligned if the array is aligned. See for
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-- example System.Pack_10 in file s-pack10).
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type Packed_Bytes4 is new Packed_Bytes1;
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for Packed_Bytes4'Alignment use Integer'Min (4, Standard'Maximum_Alignment);
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-- This is the type used to implement packed arrays where an alignment
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-- of 4 (if possible) is helpful for maximum efficiency of the get and
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-- set routines in the corresponding library unit. This is true of all
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-- component sizes that are divisible by 4 (other than powers of 2, which
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-- are either handled by direct masking or not packed at all). In such
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-- cases the clusters can be assumed to be 4-byte aligned if the array
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-- is aligned (see System.Pack_12 in file s-pack12 as an example).
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type Bits_1 is mod 2**1;
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type Bits_2 is mod 2**2;
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type Bits_4 is mod 2**4;
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-- Types used for packed array conversions
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subtype Bytes_F is Packed_Bytes4 (1 .. Float'Size / 8);
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-- Type used in implementation of Is_Negative intrinsic (see Exp_Intr)
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function Shift_Left
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(Value : Short_Short_Unsigned;
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Amount : Natural) return Short_Short_Unsigned;
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function Shift_Right
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(Value : Short_Short_Unsigned;
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Amount : Natural) return Short_Short_Unsigned;
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function Shift_Right_Arithmetic
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(Value : Short_Short_Unsigned;
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Amount : Natural) return Short_Short_Unsigned;
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function Rotate_Left
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(Value : Short_Short_Unsigned;
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Amount : Natural) return Short_Short_Unsigned;
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function Rotate_Right
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(Value : Short_Short_Unsigned;
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Amount : Natural) return Short_Short_Unsigned;
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function Shift_Left
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(Value : Short_Unsigned;
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Amount : Natural) return Short_Unsigned;
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function Shift_Right
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(Value : Short_Unsigned;
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Amount : Natural) return Short_Unsigned;
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function Shift_Right_Arithmetic
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(Value : Short_Unsigned;
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Amount : Natural) return Short_Unsigned;
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function Rotate_Left
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(Value : Short_Unsigned;
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Amount : Natural) return Short_Unsigned;
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function Rotate_Right
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(Value : Short_Unsigned;
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Amount : Natural) return Short_Unsigned;
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function Shift_Left
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(Value : Unsigned;
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Amount : Natural) return Unsigned;
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function Shift_Right
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(Value : Unsigned;
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Amount : Natural) return Unsigned;
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function Shift_Right_Arithmetic
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(Value : Unsigned;
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Amount : Natural) return Unsigned;
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function Rotate_Left
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(Value : Unsigned;
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Amount : Natural) return Unsigned;
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function Rotate_Right
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(Value : Unsigned;
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Amount : Natural) return Unsigned;
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function Shift_Left
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(Value : Long_Unsigned;
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Amount : Natural) return Long_Unsigned;
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function Shift_Right
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(Value : Long_Unsigned;
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Amount : Natural) return Long_Unsigned;
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function Shift_Right_Arithmetic
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(Value : Long_Unsigned;
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Amount : Natural) return Long_Unsigned;
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function Rotate_Left
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(Value : Long_Unsigned;
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Amount : Natural) return Long_Unsigned;
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function Rotate_Right
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(Value : Long_Unsigned;
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Amount : Natural) return Long_Unsigned;
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function Shift_Left
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(Value : Long_Long_Unsigned;
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Amount : Natural) return Long_Long_Unsigned;
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function Shift_Right
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(Value : Long_Long_Unsigned;
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Amount : Natural) return Long_Long_Unsigned;
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function Shift_Right_Arithmetic
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(Value : Long_Long_Unsigned;
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Amount : Natural) return Long_Long_Unsigned;
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function Rotate_Left
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(Value : Long_Long_Unsigned;
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Amount : Natural) return Long_Long_Unsigned;
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function Rotate_Right
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(Value : Long_Long_Unsigned;
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Amount : Natural) return Long_Long_Unsigned;
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pragma Import (Intrinsic, Shift_Left);
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pragma Import (Intrinsic, Shift_Right);
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pragma Import (Intrinsic, Shift_Right_Arithmetic);
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pragma Import (Intrinsic, Rotate_Left);
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pragma Import (Intrinsic, Rotate_Right);
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-- The following definitions are obsolescent. They were needed by the
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-- previous version of the compiler and runtime, but are not needed
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-- by the current version. We retain them to help with bootstrap path
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-- problems. Also they seem harmless, and if any user programs have
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-- been (rather improperly) using these types, why discombobulate them?
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subtype Packed_Bytes is Packed_Bytes4;
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subtype Packed_Bytes_Unaligned is Packed_Bytes1;
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end System.Unsigned_Types;
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