1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
5 -- G N A T . D Y N A M I C _ T A B L E S --
9 -- Copyright (C) 2000-2001 Ada Core Technologies, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 2, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
20 -- MA 02111-1307, USA. --
22 -- As a special exception, if other files instantiate generics from this --
23 -- unit, or you link this unit with other files to produce an executable, --
24 -- this unit does not by itself cause the resulting executable to be --
25 -- covered by the GNU General Public License. This exception does not --
26 -- however invalidate any other reasons why the executable file might be --
27 -- covered by the GNU Public License. --
29 -- GNAT is maintained by Ada Core Technologies Inc (http://www.gnat.com). --
31 ------------------------------------------------------------------------------
33 with System
; use System
;
34 with System
.Memory
; use System
.Memory
;
35 with System
.Address_To_Access_Conversions
;
37 package body GNAT
.Dynamic_Tables
is
39 Min
: constant Integer := Integer (Table_Low_Bound
);
40 -- Subscript of the minimum entry in the currently allocated table
42 -----------------------
43 -- Local Subprograms --
44 -----------------------
46 procedure Reallocate
(T
: in out Instance
);
47 -- Reallocate the existing table according to the current value stored
48 -- in Max. Works correctly to do an initial allocation if the table
51 package Table_Conversions
is
52 new System
.Address_To_Access_Conversions
(Big_Table_Type
);
53 -- Address and Access conversions for a Table object.
55 function To_Address
(Table
: Table_Ptr
) return Address
;
56 pragma Inline
(To_Address
);
57 -- Returns the Address for the Table object.
59 function To_Pointer
(Table
: Address
) return Table_Ptr
;
60 pragma Inline
(To_Pointer
);
61 -- Returns the Access pointer for the Table object.
72 T
.P
.Last_Val
:= T
.P
.Last_Val
+ Num
;
74 if T
.P
.Last_Val
> T
.P
.Max
then
83 procedure Append
(T
: in out Instance
; New_Val
: Table_Component_Type
) is
86 T
.Table
(Table_Index_Type
(T
.P
.Last_Val
)) := New_Val
;
93 procedure Decrement_Last
(T
: in out Instance
) is
95 T
.P
.Last_Val
:= T
.P
.Last_Val
- 1;
102 procedure Free
(T
: in out Instance
) is
104 Free
(To_Address
(T
.Table
));
113 procedure Increment_Last
(T
: in out Instance
) is
115 T
.P
.Last_Val
:= T
.P
.Last_Val
+ 1;
117 if T
.P
.Last_Val
> T
.P
.Max
then
126 procedure Init
(T
: in out Instance
) is
127 Old_Length
: constant Integer := T
.P
.Length
;
130 T
.P
.Last_Val
:= Min
- 1;
131 T
.P
.Max
:= Min
+ Table_Initial
- 1;
132 T
.P
.Length
:= T
.P
.Max
- Min
+ 1;
134 -- If table is same size as before (happens when table is never
135 -- expanded which is a common case), then simply reuse it. Note
136 -- that this also means that an explicit Init call right after
137 -- the implicit one in the package body is harmless.
139 if Old_Length
= T
.P
.Length
then
142 -- Otherwise we can use Reallocate to get a table of the right size.
143 -- Note that Reallocate works fine to allocate a table of the right
144 -- initial size when it is first allocated.
155 function Last
(T
: in Instance
) return Table_Index_Type
is
157 return Table_Index_Type
(T
.P
.Last_Val
);
164 procedure Reallocate
(T
: in out Instance
) is
168 if T
.P
.Max
< T
.P
.Last_Val
then
169 while T
.P
.Max
< T
.P
.Last_Val
loop
170 T
.P
.Length
:= T
.P
.Length
* (100 + Table_Increment
) / 100;
171 T
.P
.Max
:= Min
+ T
.P
.Length
- 1;
176 size_t
((T
.P
.Max
- Min
+ 1) *
177 (Table_Type
'Component_Size / Storage_Unit
));
179 if T
.Table
= null then
180 T
.Table
:= To_Pointer
(Alloc
(New_Size
));
182 elsif New_Size
> 0 then
184 To_Pointer
(Realloc
(Ptr
=> To_Address
(T
.Table
),
188 if T
.P
.Length
/= 0 and then T
.Table
= null then
198 procedure Release
(T
: in out Instance
) is
200 T
.P
.Length
:= T
.P
.Last_Val
- Integer (Table_Low_Bound
) + 1;
201 T
.P
.Max
:= T
.P
.Last_Val
;
210 (T
: in out Instance
;
211 Index
: Table_Index_Type
;
212 Item
: Table_Component_Type
)
215 if Integer (Index
) > T
.P
.Max
then
219 T
.Table
(Index
) := Item
;
226 procedure Set_Last
(T
: in out Instance
; New_Val
: Table_Index_Type
) is
228 if Integer (New_Val
) < T
.P
.Last_Val
then
229 T
.P
.Last_Val
:= Integer (New_Val
);
232 T
.P
.Last_Val
:= Integer (New_Val
);
234 if T
.P
.Last_Val
> T
.P
.Max
then
244 function To_Address
(Table
: Table_Ptr
) return Address
is
246 return Table_Conversions
.To_Address
247 (Table_Conversions
.Object_Pointer
(Table
));
254 function To_Pointer
(Table
: Address
) return Table_Ptr
is
256 return Table_Ptr
(Table_Conversions
.To_Pointer
(Table
));
259 end GNAT
.Dynamic_Tables
;