1 ------------------------------------------------------------------------------
3 -- GNAT RUNTIME COMPONENTS --
5 -- S Y S T E M . W I D _ E N U M --
10 -- Copyright (C) 1992-2001 Free Software Foundation, Inc. --
12 -- GNAT is free software; you can redistribute it and/or modify it under --
13 -- terms of the GNU General Public License as published by the Free Soft- --
14 -- ware Foundation; either version 2, or (at your option) any later ver- --
15 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
16 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
17 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
18 -- for more details. You should have received a copy of the GNU General --
19 -- Public License distributed with GNAT; see file COPYING. If not, write --
20 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
21 -- MA 02111-1307, USA. --
23 -- As a special exception, if other files instantiate generics from this --
24 -- unit, or you link this unit with other files to produce an executable, --
25 -- this unit does not by itself cause the resulting executable to be --
26 -- covered by the GNU General Public License. This exception does not --
27 -- however invalidate any other reasons why the executable file might be --
28 -- covered by the GNU Public License. --
30 -- GNAT was originally developed by the GNAT team at New York University. --
31 -- Extensive contributions were provided by Ada Core Technologies Inc. --
33 ------------------------------------------------------------------------------
35 with Unchecked_Conversion
;
37 package body System
.Wid_Enum
is
39 -------------------------
40 -- Width_Enumeration_8 --
41 -------------------------
43 function Width_Enumeration_8
45 Indexes
: System
.Address
;
49 pragma Warnings
(Off
, Names
);
53 type Natural_8
is range 0 .. 2 ** 7 - 1;
54 type Index_Table
is array (Natural) of Natural_8
;
55 type Index_Table_Ptr
is access Index_Table
;
57 function To_Index_Table_Ptr
is
58 new Unchecked_Conversion
(System
.Address
, Index_Table_Ptr
);
60 IndexesT
: constant Index_Table_Ptr
:= To_Index_Table_Ptr
(Indexes
);
65 for J
in Lo
.. Hi
loop
66 W
:= Natural'Max (W
, Natural (IndexesT
(J
+ 1) - IndexesT
(J
)));
70 end Width_Enumeration_8
;
72 --------------------------
73 -- Width_Enumeration_16 --
74 --------------------------
76 function Width_Enumeration_16
78 Indexes
: System
.Address
;
82 pragma Warnings
(Off
, Names
);
86 type Natural_16
is range 0 .. 2 ** 15 - 1;
87 type Index_Table
is array (Natural) of Natural_16
;
88 type Index_Table_Ptr
is access Index_Table
;
90 function To_Index_Table_Ptr
is
91 new Unchecked_Conversion
(System
.Address
, Index_Table_Ptr
);
93 IndexesT
: constant Index_Table_Ptr
:= To_Index_Table_Ptr
(Indexes
);
98 for J
in Lo
.. Hi
loop
99 W
:= Natural'Max (W
, Natural (IndexesT
(J
+ 1) - IndexesT
(J
)));
103 end Width_Enumeration_16
;
105 --------------------------
106 -- Width_Enumeration_32 --
107 --------------------------
109 function Width_Enumeration_32
111 Indexes
: System
.Address
;
115 pragma Warnings
(Off
, Names
);
119 type Natural_32
is range 0 .. 2 ** 31 - 1;
120 type Index_Table
is array (Natural) of Natural_32
;
121 type Index_Table_Ptr
is access Index_Table
;
123 function To_Index_Table_Ptr
is
124 new Unchecked_Conversion
(System
.Address
, Index_Table_Ptr
);
126 IndexesT
: constant Index_Table_Ptr
:= To_Index_Table_Ptr
(Indexes
);
131 for J
in Lo
.. Hi
loop
132 W
:= Natural'Max (W
, Natural (IndexesT
(J
+ 1) - IndexesT
(J
)));
136 end Width_Enumeration_32
;