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
46 (prerr_endline ("skip: " ^ CicPp.ppterm (Universe.key ty)); [])
50 let index (univ,cache) key term =
51 Universe.index univ key term,cache
54 let index_term_and_unfolded_term (univ,cache) context t ty =
55 Universe.index_local_term univ context t ty, cache
58 let cache_add_list (univ,cache) context terms_and_types =
62 prerr_endline ("indexing: " ^ CicPp.ppterm ty);
63 Universe.index_local_term univ context t ty)
68 let cache_examine (_,oldcache) cache_key =
69 prerr_endline ("examine : " ^ CicPp.ppterm cache_key);
70 try snd (List.find (fun (x,_) -> CicUtil.alpha_equivalence x cache_key)
71 oldcache) with Not_found ->
72 prerr_endline "notfound";
75 let cache_replace (univ,oldcache) key v =
76 let oldcache = List.filter (fun (i,_) -> i <> key) oldcache in
77 univ, (key,v)::oldcache
79 let cache_remove (univ,oldcache) key =
80 let oldcache = List.filter (fun (i,_) -> i <> key) oldcache in
83 let cache_add_failure cache cache_key depth =
85 ("CACHE: ADD FAIL " ^ CicPp.ppterm cache_key ^
86 " depth: " ^ string_of_int depth);
87 match cache_examine cache cache_key with
88 | Failed_in i when i > depth -> cache
91 | UnderInspection -> cache_replace cache cache_key (Failed_in depth)
94 prerr_endline (CicPp.ppterm t);
95 assert false (* if succed it can't fail *) *)
97 let cache_add_success ((univ,_) as cache) cache_key proof =
98 let u_key = Universe.key cache_key in
99 if u_key <> cache_key then
100 Universe.index univ u_key proof, snd cache
104 (match cache_examine cache cache_key with
105 | Failed_in _ -> cache_replace cache cache_key (Succeded proof)
106 | UnderInspection -> cache_replace cache cache_key (Succeded proof)
107 | Succeded t -> (* we may decide to keep the smallest proof *) cache
108 | Notfound -> cache_replace cache cache_key (Succeded proof))
110 (if Universe.key cache_key = cache_key then
111 Universe.index univ cache_key proof
114 (prerr_endline ("CACHE: ADD SUCCESS" ^ CicPp.ppterm cache_key);
115 match cache_examine cache cache_key with
116 | Failed_in _ -> cache_replace cache cache_key (Succeded proof)
117 | UnderInspection -> cache_replace cache cache_key (Succeded proof)
118 | Succeded t -> (* we may decide to keep the smallest proof *) cache
119 | Notfound -> cache_replace cache cache_key (Succeded proof))
122 let cache_add_underinspection ((univ,oldcache) as cache) cache_key depth =
123 prerr_endline ("CACHE: ADD INSPECTING" ^ CicPp.ppterm cache_key);
124 match cache_examine cache cache_key with
125 | Failed_in i when i < depth -> cache_replace cache cache_key UnderInspection
126 | Notfound -> univ,(cache_key,UnderInspection)::oldcache
129 | Succeded _ -> assert false (* it must be a new goal *)
131 let cache_print context (_,oldcache) =
132 let names = List.map (function None -> None | Some (x,_) -> Some x) context in
136 | (k,Succeded _) -> Some ("CACHE SUCCESS: " ^ CicPp.pp k names)
140 let cache_remove_underinspection ((univ,oldcache) as cache) cache_key =
141 prerr_endline ("CACHE: REMOVE INSPECTING" ^ CicPp.ppterm cache_key);
142 match cache_examine cache cache_key with
144 | Failed_in _ (* -> assert false *)
145 | UnderInspection -> cache_remove cache cache_key
146 | Succeded _ -> cache (*
147 prerr_endline (CicPp.ppterm cache_key);
148 assert false (* it must be a new goal *) *)
150 let cache_size (_,oldcache) =
151 List.length (List.filter (function (_,Succeded _) -> true | _ -> false) oldcache)
153 let cache_clean (univ,oldcache) =
154 univ,List.filter (function (_,Succeded _) -> true | _ -> false) oldcache