| ------------------------------------------------------------------------------ |
| -- -- |
| -- 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; |
