File : interfac.ads
------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
5 -- I N T E R F A C E S --
-- --
-- S p e c --
-- --
-- $Revision: 1.18 $ --
10 -- --
-- This specification is adapted from the Ada Reference Manual for use with --
-- GNAT. In accordance with the copyright of that document, you can freely --
-- copy and modify this specification, provided that if you redistribute a --
-- modified version, any changes that you have made are clearly indicated. --
15 -- --
------------------------------------------------------------------------------
-- Assumes integer sizes of 8, 16, 32 and 64 are available, and that the
-- floating-point formats are IEEE compatible.
20
-- There is a specialized version of this package for OpenVMS.
package Interfaces is
pragma Pure (Interfaces);
25
type Integer_8 is range -2 ** 7 .. 2 ** 7 - 1;
for Integer_8'Size use 8;
type Integer_16 is range -2 ** 15 .. 2 ** 15 - 1;
30 for Integer_16'Size use 16;
type Integer_32 is range -2 ** 31 .. 2 ** 31 - 1;
for Integer_32'Size use 32;
35 type Integer_64 is range -2 ** 63 .. 2 ** 63 - 1;
for Integer_64'Size use 64;
type Unsigned_8 is mod 2 ** 8;
for Unsigned_8'Size use 8;
40
type Unsigned_16 is mod 2 ** 16;
for Unsigned_16'Size use 16;
type Unsigned_32 is mod 2 ** 32;
45 for Unsigned_32'Size use 32;
type Unsigned_64 is mod 2 ** 64;
for Unsigned_64'Size use 64;
50 function Shift_Left
(Value : Unsigned_8;
Amount : Natural)
return Unsigned_8;
55 function Shift_Right
(Value : Unsigned_8;
Amount : Natural)
return Unsigned_8;
60 function Shift_Right_Arithmetic
(Value : Unsigned_8;
Amount : Natural)
return Unsigned_8;
65 function Rotate_Left
(Value : Unsigned_8;
Amount : Natural)
return Unsigned_8;
70 function Rotate_Right
(Value : Unsigned_8;
Amount : Natural)
return Unsigned_8;
75 function Shift_Left
(Value : Unsigned_16;
Amount : Natural)
return Unsigned_16;
80 function Shift_Right
(Value : Unsigned_16;
Amount : Natural)
return Unsigned_16;
85 function Shift_Right_Arithmetic
(Value : Unsigned_16;
Amount : Natural)
return Unsigned_16;
90 function Rotate_Left
(Value : Unsigned_16;
Amount : Natural)
return Unsigned_16;
95 function Rotate_Right
(Value : Unsigned_16;
Amount : Natural)
return Unsigned_16;
100 function Shift_Left
(Value : Unsigned_32;
Amount : Natural)
return Unsigned_32;
105 function Shift_Right
(Value : Unsigned_32;
Amount : Natural)
return Unsigned_32;
110 function Shift_Right_Arithmetic
(Value : Unsigned_32;
Amount : Natural)
return Unsigned_32;
115 function Rotate_Left
(Value : Unsigned_32;
Amount : Natural)
return Unsigned_32;
120 function Rotate_Right
(Value : Unsigned_32;
Amount : Natural)
return Unsigned_32;
125 function Shift_Left
(Value : Unsigned_64;
Amount : Natural)
return Unsigned_64;
130 function Shift_Right
(Value : Unsigned_64;
Amount : Natural)
return Unsigned_64;
135 function Shift_Right_Arithmetic
(Value : Unsigned_64;
Amount : Natural)
return Unsigned_64;
140 function Rotate_Left
(Value : Unsigned_64;
Amount : Natural)
return Unsigned_64;
145 function Rotate_Right
(Value : Unsigned_64;
Amount : Natural)
return Unsigned_64;
150 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);
155
-- Floating point types. We assume that we are on an IEEE machine, and
-- that the types Short_Float and Long_Float in Standard refer to the
-- 32-bit short and 64-bit long IEEE forms. Furthermore, if there is
-- an extended float, we assume that it is available as Long_Long_Float.
160 -- Note: it is harmless, and explicitly permitted, to include additional
-- types in interfaces, so it is not wrong to have IEEE_Extended_Float
-- defined even if the extended format is not available.
type IEEE_Float_32 is new Short_Float;
165 type IEEE_Float_64 is new Long_Float;
type IEEE_Extended_Float is new Long_Long_Float;
end Interfaces;