1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
|
------------------------------------------------------------------------------
-- --
-- GNAT RUNTIME 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) 1992-2001 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 2, 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. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNAT; see file COPYING. If not, write --
-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
-- MA 02111-1307, USA. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- this unit does not by itself cause the resulting executable to be --
-- covered by the GNU General Public License. This exception does not --
-- however invalidate any other reasons why the executable file might be --
-- covered by the GNU Public License. --
-- --
-- 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.
package System.Unsigned_Types is
pragma Pure (Unsigned_Types);
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_Butes array
type Packed_Bytes1 is array (Natural range <>) of Packed_Byte;
for Packed_Bytes1'Alignment use 1;
-- 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 2;
-- This is the type used to implement packed arrays where an alignment
-- of 2 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 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 instrinsic (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 obsolsecent. 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;
|
