1 (* Copyright (C) 2002, HELM Team.
3 * This file is part of HELM, an Hypertextual, Electronic
4 * Library of Mathematics, developed at the Computer Science
5 * Department, University of Bologna, Italy.
7 * HELM is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2
10 * of the License, or (at your option) any later version.
12 * HELM is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with HELM; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
22 * For details, see the HELM World-Wide-Web page,
23 * http://cs.unibo.it/helm/.
26 type cache_key = Cic.term
29 | Succeded of Cic.term
32 type cache = (Universe.universe * ((cache_key * cache_elem) list));;
36 if debug then prerr_endline s else ()
39 let cache_empty = (Universe.empty,[]);;
41 let get_candidates (univ,_) ty =
42 if Universe.key ty = ty then
43 Universe.get_candidates univ ty
48 let index (univ,cache) key term =
49 Universe.index univ key term,cache
52 let index_term_and_unfolded_term (univ,cache) context t ty =
53 Universe.index_local_term univ context t ty, cache
56 let cache_add_list (univ,cache) context terms_and_types =
60 Universe.index_local_term univ context t ty)
65 let cache_examine (_,oldcache) cache_key =
66 prerr_endline ("examine : " ^ CicPp.ppterm cache_key);
67 try List.assoc cache_key oldcache with Not_found ->
68 prerr_endline "notfound";
71 let cache_replace (univ,oldcache) key v =
72 let oldcache = List.filter (fun (i,_) -> i <> key) oldcache in
73 univ, (key,v)::oldcache
75 let cache_remove (univ,oldcache) key =
76 let oldcache = List.filter (fun (i,_) -> i <> key) oldcache in
79 let cache_add_failure cache cache_key depth =
81 ("CACHE: ADD FAIL " ^ CicPp.ppterm cache_key ^
82 " depth: " ^ string_of_int depth);
83 match cache_examine cache cache_key with
84 | Failed_in i when i > depth -> cache
87 | UnderInspection -> cache_replace cache cache_key (Failed_in depth)
90 prerr_endline (CicPp.ppterm t);
91 assert false (* if succed it can't fail *) *)
93 let cache_add_success ((univ,_) as cache) cache_key proof =
94 let u_key = Universe.key cache_key in
95 if u_key <> cache_key then
96 Universe.index univ u_key proof, snd cache
100 (match cache_examine cache cache_key with
101 | Failed_in _ -> cache_replace cache cache_key (Succeded proof)
102 | UnderInspection -> cache_replace cache cache_key (Succeded proof)
103 | Succeded t -> (* we may decide to keep the smallest proof *) cache
104 | Notfound -> cache_replace cache cache_key (Succeded proof))
106 (if Universe.key cache_key = cache_key then
107 Universe.index univ cache_key proof
110 (prerr_endline ("CACHE: ADD SUCCESS" ^ CicPp.ppterm cache_key);
111 match cache_examine cache cache_key with
112 | Failed_in _ -> cache_replace cache cache_key (Succeded proof)
113 | UnderInspection -> cache_replace cache cache_key (Succeded proof)
114 | Succeded t -> (* we may decide to keep the smallest proof *) cache
115 | Notfound -> cache_replace cache cache_key (Succeded proof))
118 let cache_add_underinspection ((univ,oldcache) as cache) cache_key depth =
119 prerr_endline ("CACHE: ADD INSPECTING" ^ CicPp.ppterm cache_key);
120 match cache_examine cache cache_key with
121 | Failed_in i when i < depth -> cache_replace cache cache_key UnderInspection
122 | Notfound -> univ,(cache_key,UnderInspection)::oldcache
125 | Succeded _ -> assert false (* it must be a new goal *)
127 let cache_print context (_,oldcache) =
128 let names = List.map (function None -> None | Some (x,_) -> Some x) context in
132 | (k,Succeded _) -> Some ("CACHE SUCCESS: " ^ CicPp.pp k names)
136 let cache_remove_underinspection ((univ,oldcache) as cache) cache_key =
137 prerr_endline ("CACHE: REMOVE INSPECTING" ^ CicPp.ppterm cache_key);
138 match cache_examine cache cache_key with
140 | Failed_in _ (* -> assert false *)
141 | UnderInspection -> cache_remove cache cache_key
142 | Succeded _ -> cache (*
143 prerr_endline (CicPp.ppterm cache_key);
144 assert false (* it must be a new goal *) *)
146 let cache_size (_,oldcache) =
147 List.length (List.filter (function (_,Succeded _) -> true | _ -> false) oldcache)
149 let cache_clean (univ,oldcache) =
150 univ,List.filter (function (_,Succeded _) -> true | _ -> false) oldcache