blob: 4420c6a4d7ba7cf27791fa1ead1684b6b24ced20 (
plain)
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
|
(*
* Copyright (C) 2006-2007 XenSource Ltd.
* Copyright (C) 2008 Citrix Ltd.
* Author Thomas Gazagnaire <thomas.gazagnaire@eu.citrix.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; version 2.1 only. with the special
* exception on linking described in file LICENSE.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*)
type t = int
type 'a record = { data: 'a; mutable garbage: bool }
let int_string_tbl : (int,string record) Hashtbl.t = Hashtbl.create 1024
let string_int_tbl : (string,int) Hashtbl.t = Hashtbl.create 1024
let created_counter = ref 0
let used_counter = ref 0
let count = ref 0
let rec fresh () =
if Hashtbl.mem int_string_tbl !count
then begin
incr count;
fresh ()
end else
!count
let new_record v = { data=v; garbage=false }
let of_string name =
if Hashtbl.mem string_int_tbl name
then begin
incr used_counter;
Hashtbl.find string_int_tbl name
end else begin
let i = fresh () in
incr created_counter;
Hashtbl.add string_int_tbl name i;
Hashtbl.add int_string_tbl i (new_record name);
i
end
let to_string i =
(Hashtbl.find int_string_tbl i).data
let mark_all_as_unused () =
Hashtbl.iter (fun _ v -> v.garbage <- true) int_string_tbl
let mark_as_used symb =
let record1 = Hashtbl.find int_string_tbl symb in
record1.garbage <- false
let garbage () =
let records = Hashtbl.fold (fun symb record accu ->
if record.garbage then (symb, record.data) :: accu else accu
) int_string_tbl [] in
let remove (int,string) =
Hashtbl.remove int_string_tbl int;
Hashtbl.remove string_int_tbl string
in
created_counter := 0;
used_counter := 0;
List.iter remove records
let stats () =
Hashtbl.length string_int_tbl
let created () = !created_counter
let used () = !used_counter
|
