6 let bomb = ref(`Var ~-1);;
10 ; div: i_var option (* None = bomb *)
11 ; conv: i_n_var list (* the inerts that must converge *)
12 ; ps: i_n_var list (* the n-th inert must become n *)
13 ; sigma: (int * nf) list (* the computed substitution *)
14 ; deltas: (int * nf) list ref list (* collection of all branches *)
15 ; steps: int (* how many steps the algorithm made until now *)
19 (* let heads = Util.sort_uniq (List.map hd_of_i_var p.ps) in
21 List.map (fun (_, bs) -> List.map (fun (x,_) -> List.nth p.ps x) !bs) p.deltas *)
23 (* let ($) f x = f x;; *)
25 let subterms tms freshno =
27 let no = ref freshno in
28 function t -> incr no; mk_app t (`Var !no) in
29 let applicative hd args = snd (
30 List.fold_left (fun (hd, acc) t -> let hd = mk_app hd t in hd, hd::acc) (hd, []) args) in
31 let rec aux t = match t with
34 (* applicative (`Var v) (Listx.to_list ts) @ *)
35 Util.concat_map aux (Listx.to_list ts) @ List.map apply_var (Listx.to_list ts)
36 | `Lam(_,t) -> aux (lift ~-1 t)
37 | `Match(u,bs_lift,bs,args) ->
39 (* applicative (`Match(u,bs_lift,bs,[])) args @ *)
40 Util.concat_map aux args @ List.map apply_var args
41 (* @ Util.concat_map (aux ++ (lift bs_lift) ++ snd) !bs *)
43 in let tms' = (* Util.sort_uniq ~compare:eta_compare*) (Util.concat_map aux tms) in
45 (* List.map (fun (t, v) -> match t with `N _ -> t | _ -> mk_app t v) (List.combine tms (List.mapi (fun i _ -> `Var(freshno+i)) tms)) *)
49 (match p.div with None -> [] | Some t -> [(t :> i_n_var)])
54 let problem_measure p =
55 let l = Array.to_list (Array.init (p.freshno + 1) string_of_var) in
57 (* aux |t1;t2| e' numero di step per portare la diff in testa
58 INVARIANTE: t1 <eta> t2
62 | `I(v1,nfs1), `I(v2,nfs2) ->
64 then 0 else 1 + find_first_diff (to_list nfs1, to_list nfs2)
65 | `Match (t1,bs_lift,bs,args), `Match (t2,bs_lift',bs',args') ->
66 if bs != bs' then 0 (* TODO *)
67 else if eta_eq (t1 :> nf) (t2 :> nf) then 1 + find_first_diff (args, args') else aux (t1 :> nf) (t2 :> nf) (* TODO *)
69 | _, `Match _ -> 0 (* FIXME!!! *)
70 | `Lam(_,t1), `Lam(_,t2) -> aux t1 t2
72 and find_first_diff = function
73 | [], [] -> assert false
77 if eta_eq (t1 :> nf) (t2 :> nf) then 1 + find_first_diff (ts1, ts2) else aux t1 t2
78 (* no. di step da fare per separare t1 e t2 *)
80 let res = if eta_eq t1 t2 then 0 else aux t1 t2 in
81 if res <> 0 then prerr_endline ("diff (" ^ print ~l t1 ^ ") (" ^ print ~l t2 ^ ") = " ^ string_of_int res);
84 (* aux calcola la somma delle differenze tra i termini in una lista (quadratico) *)
85 in let rec sum = function
87 | x::xs -> List.fold_right ((+) ++ (diff (x :> nf))) (xs :> nf list) (sum xs)
88 in let subterms = subterms ((all_terms p) :> nf list) p.freshno
89 (* let subterms = sort_uniq ~compare:eta_compare subterms in *)
90 in let a = sum subterms
91 in let b = List.fold_right (fun bs -> (+) (sum (List.map ((List.nth p.ps) ++ fst) !bs))) p.deltas 0
92 in let _ = prerr_endline ("Computed measure: " ^ string_of_int a ^ "," ^ string_of_int b)
96 let print_problem label ({freshno; div; conv; ps; deltas; steps} as p) =
97 Console.print_hline ();
98 prerr_endline ("\n||||| Displaying problem: " ^ label ^ " |||||");
100 let deltas = String.concat nl (List.map (fun r -> String.concat " <> " (List.map (fun (i,_) -> string_of_int i) !r)) deltas) in
101 let l = Array.to_list (Array.init (freshno + 1) string_of_var) in
102 nl ^ string_of_int steps ^ " steps left; measure="^string_of_int(problem_measure p)^" freshno = " ^ string_of_int freshno
103 ^ nl ^ "\b> DISCRIMINATING SETS (deltas)"
104 ^ nl ^ deltas ^ (if deltas = "" then "" else nl)
105 ^ "\b> DIVERGENT" ^ nl
106 ^ "*: " ^ (match div with None -> "*" | Some div -> print ~l (div :> nf)) ^ "\n| "
107 ^ "\b> CONVERGENT" ^ nl
108 ^ String.concat "\n| " (List.map (fun t -> "_: " ^ (if t = `N (-1) then "_" else print ~l (t :> nf))) conv) ^
109 (if conv = [] then "" else "\n| ")
111 ^ String.concat "\n| " (List.mapi (fun i t -> string_of_int i ^ ": " ^ print ~l (t :> nf)) ps)
116 let failwithProblem p reason =
117 print_endline (print_problem "FAIL" p);
121 let make_fresh_var p =
122 let freshno = p.freshno + 1 in
123 {p with freshno}, `Var freshno
126 let make_fresh_vars p m =
128 (* fold_left vs. fold_right hides/shows the bug in problem q7 *)
129 (fun (p, vars) _ -> let p, var = make_fresh_var p in p, var::vars)
134 let simple_expand_match ps =
135 let rec aux level = function
136 | #i_num_var as t -> aux_i_num_var level t
137 | `Lam(b,t) -> `Lam(b, aux (level+1) t)
138 and aux_i_num_var level = function
139 | `Match(u,bs_lift,bs,args) as torig ->
140 let u = aux_i_num_var level u in
141 bs := List.map (fun (n, x) -> n, aux 0 x) !bs;
145 let i = index_of (lift (-level) u) (ps :> nf list) (* can raise Not_found *)
146 in let t = mk_match (`N i) bs_lift bs args in
150 | _ -> raise Not_found)
152 `Match(cast_to_i_num_var u,bs_lift,bs,List.map (aux level) args))
153 | `I(k,args) -> `I(k,Listx.map (aux level) args)
154 | `N _ | `Var _ as t -> t
158 let rec aux x = let x' = f x in if x <> x' then aux x' else x in aux
161 let rec super_simplify_ps ps =
162 fixpoint (List.map (cast_to_i_num_var ++ (simple_expand_match ps)))
165 let super_simplify ({div; ps; conv} as p) =
166 let ps = super_simplify_ps p.ps (p.ps :> i_num_var list) in
167 let conv = super_simplify_ps ps (p.conv :> i_num_var list) in
168 let div = option_map (fun div ->
169 let divs = super_simplify_ps p.ps ([div] :> i_num_var list) in
171 {p with div=option_map cast_to_i_var div; ps=List.map cast_to_i_n_var ps; conv=List.map cast_to_i_n_var conv}
173 exception ExpandedToLambda;;
175 let subst_in_problem x inst ({freshno; div; conv; ps; sigma} as p) =
176 let len_ps = List.length ps in
177 (*(let l = Array.to_list (Array.init (freshno + 1) string_of_var) in
178 prerr_endline ("# INST0: " ^ string_of_var x ^ " := " ^ print ~l inst));*)
179 let rec aux ((freshno,acc_ps,acc_new_ps) as acc) =
183 (*prerr_endline ("EXPAND t:" ^ print (t :> nf));*)
184 let t = subst false x inst (t :> nf) in
185 (*prerr_endline ("SUBSTITUTED t:" ^ print (t :> nf));*)
186 let freshno,new_t,acc_new_ps =
187 expand_match (freshno,acc_ps@`Var(max_int/3)::todo_ps,acc_new_ps) t
189 aux (freshno,acc_ps@[new_t],acc_new_ps) todo_ps
191 (* cut&paste from aux above *)
192 and aux' ps ((freshno,acc_conv,acc_new_ps) as acc) =
196 (*prerr_endline ("EXPAND t:" ^ print (t :> nf));*)
198 let t = subst false x inst (t :> nf) in
199 (*prerr_endline ("SUBSTITUTED t:" ^ print (t :> nf));*)
200 let freshno,new_t,acc_new_ps =
201 expand_match (freshno,ps,acc_new_ps) t
203 aux' ps (freshno,acc_conv@[new_t],acc_new_ps) todo_conv
204 (* with ExpandedToLambda -> aux' ps (freshno,acc_conv@[`N(-1)],acc_new_ps) todo_conv *)
206 (* cut&paste from aux' above *)
207 and aux'' ps (freshno,acc_new_ps) =
209 | None -> freshno, None, acc_new_ps
211 let t = subst false x inst (t :> nf) in
212 let freshno,new_t,acc_new_ps =
213 expand_match (freshno,ps,acc_new_ps) t
215 freshno,Some new_t,acc_new_ps
217 and expand_match ((freshno,acc_ps,acc_new_ps) as acc) t =
219 | `Match(u',bs_lift,bs,args) ->
220 let freshno,u,acc_new_ps = expand_match acc (u' :> nf) in
223 | `N i -> acc_new_ps,i
225 let ps = List.map (fun t -> cast_to_i_num_var (subst false x inst (t:> nf))) (acc_ps@acc_new_ps) in
226 let super_simplified_ps = super_simplify_ps ps ps in
227 (*prerr_endline ("CERCO u:" ^ print (fst u :> nf));
228 List.iter (fun x -> prerr_endline ("IN: " ^ print (fst x :> nf))) ps;
229 List.iter (fun x -> prerr_endline ("IN2: " ^ print (fst x :> nf))) super_simplified_ps;*)
230 match index_of_opt ~eq:eta_eq super_simplified_ps u with
231 Some i -> acc_new_ps, i
232 | None -> acc_new_ps@[u], len_ps + List.length acc_new_ps
235 if List.exists (fun (j,_) -> i=j) !bs then
238 let freshno,v = freshno+1, `Var (freshno+1) in (* make_fresh_var freshno in *)
241 (*prerr_endlie ("t DA RIDURRE:" ^ print (`Match(`N i,arity,bs_lift,bs,args) :> nf) ^ " more_args=" ^ string_of_int more_args);*)
242 let t = mk_match (`N i) bs_lift bs args in
243 (*prerr_endline ("NUOVO t:" ^ print (fst t :> nf) ^ " more_args=" ^ string_of_int (snd t));*)
244 expand_match (freshno,acc_ps,acc_new_ps) t
245 | `Lam _ -> raise ExpandedToLambda
247 let x = simple_expand_match (acc_ps@acc_new_ps) x in
248 freshno,cast_to_i_num_var x,acc_new_ps in
250 let freshno,old_ps,new_ps = aux (freshno,[],[]) (ps :> i_num_var list) in
251 let freshno,conv,new_ps = aux' old_ps (freshno,[],new_ps) (conv :> i_num_var list) in
252 let freshno,div,new_ps = aux'' old_ps (freshno,new_ps) (div :> i_num_var option) in
253 let div = option_map cast_to_i_var div in
254 let ps = List.map cast_to_i_n_var (old_ps @ new_ps) in
255 let conv = List.map cast_to_i_n_var conv in
256 (let l = Array.to_list (Array.init (freshno + 1) string_of_var) in
257 prerr_endline ("# INST: " ^ string_of_var x ^ " := " ^ print ~l inst));
258 let p = {p with freshno; div; conv; ps} in
259 ( (* check if double substituting a variable *)
260 if List.exists (fun (x',_) -> x = x') sigma
261 then failwithProblem p "Variable replaced twice"
263 let p = {p with sigma = sigma@[x,inst]} in
264 let p = super_simplify p in
265 prerr_endline (print_problem "instantiate" p);
271 let arity_of arities k =
272 let _,pos,y = List.find (fun (v,_,_) -> v=k) arities in
273 let arity = match y with `Var _ -> 0 | `I(_,args) -> Listx.length args | _ -> assert false in
274 arity + if pos = -1 then - 1 else 0
277 let rec dangerous arities showstoppers =
282 | `Match(t,liftno,bs,args) ->
283 (* CSC: XXX partial dependency on the encoding *)
285 `N _ -> List.iter (dangerous arities showstoppers) args
286 | `Match _ as t -> dangerous arities showstoppers t ; List.iter (dangerous arities showstoppers) args
287 | `Var x -> dangerous_inert arities showstoppers x args 2 (* 2 coming from Scott's encoding *)
288 | `I(x,args') -> dangerous_inert arities showstoppers x (Listx.to_list args' @ args) 2 (* 2 coming from Scott's encoding *)
290 | `I(k,args) -> dangerous_inert arities showstoppers k (Listx.to_list args) 0
292 and dangerous_inert arities showstoppers k args more_args =
293 List.iter (dangerous arities showstoppers) args ;
294 if List.mem k showstoppers then raise Dangerous else
296 let arity = arity_of arities k in
297 if List.length args + more_args > arity then raise Dangerous else ()
301 (* cut & paste from above *)
302 let rec dangerous_conv arities showstoppers =
307 | `Match(t,liftno,bs,args) ->
308 (* CSC: XXX partial dependency on the encoding *)
310 `N _ -> concat_map (dangerous_conv arities showstoppers) args
311 | `Match _ as t -> dangerous_conv arities showstoppers t @ concat_map (dangerous_conv arities showstoppers) args
312 | `Var x -> dangerous_inert_conv arities showstoppers x args 2 (* 2 coming from Scott's encoding *)
313 | `I(x,args') -> dangerous_inert_conv arities showstoppers x (Listx.to_list args' @ args) 2 (* 2 coming from Scott's encoding *)
315 | `I(k,args) -> dangerous_inert_conv arities showstoppers k (Listx.to_list args) 0
317 and dangerous_inert_conv arities showstoppers k args more_args =
318 concat_map (dangerous_conv arities showstoppers) args @
319 if List.mem k showstoppers then k :: concat_map free_vars args else
321 let arity = arity_of arities k in
322 prerr_endline ("dangerous_inert_conv: ar=" ^ string_of_int arity ^ " k="^string_of_var k ^ " listlenargs=" ^ (string_of_int (List.length args)) );
323 if List.length args + more_args > arity then k :: concat_map free_vars args else []
327 (* inefficient algorithm *)
328 let rec edible arities div ps conv showstoppers =
329 let rec aux showstoppers =
332 | x::xs when List.exists (fun y -> hd_of x = Some y) showstoppers ->
333 (* se la testa di x e' uno show-stopper *)
334 let new_showstoppers = sort_uniq (showstoppers @ free_vars (x :> nf)) in
335 (* aggiungi tutte le variabili libere di x *)
336 if List.length showstoppers <> List.length new_showstoppers then
337 aux new_showstoppers ps
342 None -> aux showstoppers xs
345 dangerous arities showstoppers (x : i_n_var :> nf) ;
349 aux (sort_uniq (h::showstoppers)) ps
351 let showstoppers = sort_uniq (aux showstoppers ps) in
353 List.map (dangerous_conv arities showstoppers) (conv :> nf list) in
355 prerr_endline ("dangerous_conv lenght:" ^ string_of_int (List.length dangerous_conv));
356 List.iter (fun l -> prerr_endline (String.concat " " (List.map string_of_var l))) dangerous_conv;
357 let showstoppers' = showstoppers @ List.concat dangerous_conv in
358 let showstoppers' = sort_uniq (match div with
359 | None -> showstoppers'
361 if List.exists ((=) (hd_of_i_var div)) showstoppers'
362 then showstoppers' @ free_vars (div :> nf) else showstoppers') in
363 if showstoppers <> showstoppers' then edible arities div ps conv showstoppers' else showstoppers', dangerous_conv
366 let precompute_edible_data {ps; div} xs =
367 (match div with None -> [] | Some div -> [hd_of_i_var div, -1, (div :> i_n_var)]) @
369 let i, tm = Util.findi (fun y -> hd_of y = Some hd) ps in
374 let critical_showstoppers p =
375 let p = super_simplify p in
376 let hd_of_div = match p.div with None -> [] | Some t -> [hd_of_i_var t] in
377 let showstoppers_step =
378 concat_map (fun bs ->
379 let heads = List.map (fun (i,_) -> List.nth p.ps i) !bs in
380 let heads = List.sort compare (hd_of_div @ filter_map hd_of heads) in
381 snd (split_duplicates heads)
383 if List.exists (fun t -> [hd_of t] = List.map (fun x -> Some x) hd_of_div) p.conv
384 then hd_of_div else [] in
385 let showstoppers_step = sort_uniq showstoppers_step in
386 let showstoppers_eat =
387 let heads_and_arities =
388 List.sort (fun (k,_) (h,_) -> compare k h)
389 (filter_map (function `Var k -> Some (k,0) | `I(k,args) -> Some (k,Listx.length args) | _ -> None ) p.ps) in
390 let rec multiple_arities =
394 | (x,i)::(y,j)::tl when x = y && i <> j ->
395 x::multiple_arities tl
396 | _::tl -> multiple_arities tl in
397 multiple_arities heads_and_arities in
399 let showstoppers_eat = sort_uniq showstoppers_eat in
400 let showstoppers_eat = List.filter
401 (fun x -> not (List.mem x showstoppers_step))
403 List.iter (fun v -> prerr_endline ("DANGEROUS STEP: " ^ string_of_var v)) showstoppers_step;
404 List.iter (fun v -> prerr_endline ("DANGEROUS EAT: " ^ string_of_var v)) showstoppers_eat;
405 p, showstoppers_step, showstoppers_eat
409 let ({ps} as p), showstoppers_step, showstoppers_eat = critical_showstoppers p in
410 let showstoppers = showstoppers_step @ showstoppers_eat in
411 let heads = List.sort compare (filter_map hd_of ps) in
412 let arities = precompute_edible_data p (uniq heads) in
413 let showstoppers, showstoppers_conv =
414 edible arities p.div ps p.conv showstoppers in
415 let l = List.filter (fun (x,_,_) -> not (List.mem x showstoppers)) arities in
417 List.fold_left (fun p (x,pos,(xx : i_n_var)) -> if pos = -1 then p else
418 let n = match xx with `I(_,args) -> Listx.length args | _ -> 0 in
420 let inst = make_lams v n in
421 (let l = Array.to_list (Array.init (p.freshno + 1) string_of_var) in
422 prerr_endline ("# INST_IN_EAT: " ^ string_of_var x ^ " := " ^ print ~l inst));
423 { p with sigma = p.sigma @ [x,inst] }
425 (* to avoid applied numbers in safe positions that
426 trigger assert failures subst_in_problem x inst p*)
430 let _,j,_ = List.find (fun (h,_,_) -> hd_of t = Some h) l in
434 let p = match p.div with
437 if List.mem (hd_of_i_var div) showstoppers
440 let n = match div with `I(_,args) -> Listx.length args | `Var _ -> 0 in
441 let p, bomb' = make_fresh_var p in
442 (if !bomb <> `Var (-1) then
444 ("Bomb was duplicated! It was " ^ string_of_nf !bomb ^
445 ", tried to change it to " ^ string_of_nf bomb'));
447 prerr_endline ("Just created bomb var: " ^ string_of_nf !bomb);
448 let x = hd_of_i_var div in
449 let inst = make_lams !bomb n in
450 prerr_endline ("# INST (div): " ^ string_of_var x ^ " := " ^ string_of_nf inst);
451 let p = {p with div=None} in
452 (* subst_in_problem (hd_of_i_var div) inst p in *)
453 {p with sigma=p.sigma@[x,inst]} in
454 let dangerous_conv = showstoppers_conv in
455 let _ = prerr_endline ("dangerous_conv lenght:" ^ string_of_int (List.length dangerous_conv));
456 List.iter (fun l -> prerr_endline (String.concat " " (List.map string_of_var l))) dangerous_conv; in
458 List.map (function s,t ->
460 if s <> [] then t else (
461 (match t with | `Var _ -> raise Not_found | _ -> ());
462 let _ = List.find (fun h -> hd_of t = Some h) showstoppers in
464 with Not_found -> match hd_of t with
465 | None -> assert (t = `N ~-1); t
467 prerr_endline ("FREEZING " ^ string_of_var h);
468 `N ~-1 (* convergent dummy*)
469 ) (List.combine showstoppers_conv p.conv) in
475 match List.nth ps n with
480 let old_conv = p.conv in
481 let p = { p with ps; conv } in
482 if l <> [] || old_conv <> conv
483 then prerr_endline (print_problem "eat" p);
484 if List.for_all (function `N _ -> true | _ -> false) ps && p.div = None then
489 let instantiate p x n =
491 then failwithProblem p ("BOMB (" ^ string_of_nf !bomb ^ ") cannot be instantiated!"));
492 let p,vars = make_fresh_vars p n in
493 let p,zero = make_fresh_var p in
494 let zero = Listx.Nil zero in
495 let args = if n = 0 then zero else Listx.append zero (Listx.from_list vars) in
497 let inst = `Lam(false,`Match(`I(0,Listx.map (lift 1) args),1,bs,[])) in
498 let p = {p with deltas=bs::p.deltas} in
499 subst_in_problem x inst p
502 let compute_special_k tms =
503 let rec aux k (t: nf) = Pervasives.max k (match t with
504 | `Lam(b,t) -> aux (k + if b then 1 else 0) t
505 | `I(n, tms) -> Listx.max (Listx.map (aux 0) tms)
506 | `Match(t, liftno, bs, args) ->
507 List.fold_left max 0 (List.map (aux 0) ((t :> nf)::args@List.map snd !bs))
510 ) in Listx.max (Listx.map (aux 0) tms)
513 let auto_instantiate (n,p) =
514 let p, showstoppers_step, showstoppers_eat = critical_showstoppers p in
516 match showstoppers_step, showstoppers_eat with
518 prerr_endline ("INSTANTIATING CRITICAL TO EAT " ^ string_of_var y); y
520 let heads = List.sort compare (filter_map (fun t -> match t with `Var _ -> None | x -> hd_of x) ((match p.div with Some t -> [(t :> i_n_var)] | _ -> []) @ p.ps)) in
524 prerr_endline ("INSTANTIATING TO EAT " ^ string_of_var x);
527 prerr_endline ("INSTANTIATING " ^ string_of_var x);
529 (* Strategy that decreases the special_k to 0 first (round robin)
530 1:11m42 2:14m5 3:11m16s 4:14m46s 5:12m7s 6:6m31s *)
533 match hd_of (List.find (fun t -> compute_special_k (Listx.Nil (t :> nf)) > 0) (all_terms p)) with
536 prerr_endline ("INSTANTIATING AND HOPING " ^ string_of_var x);
541 (* Instantiate in decreasing order of compute_special_k
542 1:15m14s 2:13m14s 3:4m55s 4:4m43s 5:4m34s 6:6m28s 7:3m31s
545 (match hd_of (snd (List.hd (List.sort (fun c1 c2 -> - compare (fst c1) (fst c2)) (filter_map (function `I _ as t -> Some (compute_special_k (Listx.Nil (t :> nf)),t) | _ -> None) (all_terms p))))) with
548 prerr_endline ("INSTANTIATING AND HOPING " ^ string_of_var x);
554 compute_special_k (Listx.from_list (all_terms p :> nf list) )in
555 if special_k < n then
556 prerr_endline ("@@@@ NEW INSTANTIATE PHASE (" ^ string_of_int special_k ^ ") @@@@");
557 let p = instantiate p x special_k in
561 let rec auto_eat (n,({ps} as p)) =
562 prerr_endline "{{{{{{{{ Computing measure before auto_instantiate }}}}}}";
563 let m = problem_measure p in
564 let (n,p') = auto_instantiate (n,p) in
568 prerr_endline "{{{{{{{{ Computing measure inafter auto_instantiate }}}}}}";
569 let delta = m - problem_measure p' in
571 (* failwithProblem p' *)
573 ("Measure did not decrease (delta=" ^ string_of_int delta ^ ")"))
574 else prerr_endline ("$ Measure decreased by " ^ string_of_int delta);
575 let p' = {p' with steps=(p'.steps - 1)} in
576 (if p'.steps < 0 then prerr_endline ">>>>>>>>>> STEPS ARE OVER <<<<<<<<<"
577 (*failwithProblem p' "steps are over. sorry."*) );
582 prerr_endline ("@@@@ FIRST INSTANTIATE PHASE (" ^ string_of_int n ^ ") @@@@");
585 | `Continue p -> auto_eat (n,p)
591 x y = y 0 a y = k k z = z 0 c y = k y u = u h1 h2 0 h2 a = h3
592 1 x a c 1 a 0 c 1 k c 1 c 0 1 k 1 k 1 k
593 2 x a y 2 a 0 y 2 k y 2 y 0 2 y 0 2 h2 0 2 h3
594 3 x b y 3 b 0 y 3 b 0 y 3 b 0 y 3 b 0 y 3 b 0 (\u. u h1 h2 0) 3 b 0 (\u. u h1 (\w.h3) 0)
595 4 x b c 4 b 0 c 4 b 0 c 4 b 0 c 4 b 0 c 4 b 0 c 4 b 0 c
596 5 x (b e) 5 b e 0 5 b e 0 5 b e 0 5 b e 0 5 b e 0 5 b e 0
597 6 y y 6 y y 6 y y 6 y y 6 y y 6 h1 h1 h2 0 h2 0 6 h1 h1 (\w. h3) 0 (\w. h3) 0
600 b u = u l1 l2 0 e _ _ _ _ = f l3 n = n j 0
603 3 l2 0 (\u. u h1 (\w. h3) 0) 3 l3 (\u. u h1 (\w. h3) 0) 3 j h1 (\w. h3) 0 0
604 4 l2 0 c 4 l3 c 4 c j 0
605 5 e l1 l2 0 0 5 f 5 f
606 6 h1 h1 (\w. h3) 0 (\w. h3) 0 6 h1 h1 (\w. h3) 0 (\w. h3) 0 6 h1 h1 (\w. h3) 0 (\w. h3) 0
611 x a (b (a c)) a 0 = 1 ? (b (a c)) 8
612 x a (b d') a 0 = 1 ? (b d') 7
613 x b (a c) b 0 = 1 ? (a c) 4
614 x b (a c') b 0 = 1 ? (a c') 5
622 b 4 = 8 (* b (a c) *)
627 (************** Tests ************************)
629 let optimize_numerals p =
630 let replace_in_sigma perm =
631 let rec aux = function
632 | `N n -> `N (List.nth perm n)
633 | `I _ -> assert false
635 | `Lam(v,t) -> `Lam(v, aux t)
636 | `Match(_,_,bs,_) as t -> (bs := List.map (fun (n,t) -> (List.nth perm n, t)) !bs); t
637 in List.map (fun (n,t) -> (n,aux t))
639 let deltas' = List.mapi (fun n d -> (n, List.map fst !d)) p.deltas in
640 let maxs = Array.to_list (Array.init (List.length deltas') (fun _ -> 0)) in
641 let max = List.fold_left max 0 (concat_map snd deltas') in
642 let perm,_ = List.fold_left (fun (perm, maxs) (curr_n:int) ->
643 let containing = filter_map (fun (i, bs) -> if List.mem curr_n bs then Some i else None) deltas' in
644 (* (prerr_endline (string_of_int curr_n ^ " occurs in: " ^ (String.concat " " (List.map string_of_int containing)))); *)
645 let neww = List.fold_left Pervasives.max 0 (List.mapi (fun n max -> if List.mem n containing then max else 0) maxs) in
646 let maxs = List.mapi (fun i m -> if List.mem i containing then neww+1 else m) maxs in
648 ) ([],maxs) (Array.to_list (Array.init (max+1) (fun x -> x))) in
649 replace_in_sigma (List.rev perm) p.sigma
652 let env_of_sigma freshno sigma should_explode =
659 e,Pure.lift (-n-1) (snd (List.find (fun (i,_) -> i = n) sigma)),[]
662 if should_explode && `Var n = !bomb
663 then ([], (let f t = Pure.A(t,t) in f (Pure.L (f (Pure.V 0)))), [])
664 else ([],Pure.V n,[]))::e
668 prerr_endline "########## main ##########";;
671 v ==> v := \a. a k1 .. kn \^m.0
672 + ==> v := \^k. numero for every v such that ...
673 * ==> tries v as long as possible and then +v as long as possible
676 let rec aux ({ps} as p) n l =
677 if List.for_all (function `N _ -> true | _ -> false) ps && p.div = None then begin
680 let _ = prerr_endline (print_problem "main" p) in
684 | [] -> read_line (),[] in
693 | `DoneWith -> assert false (*aux (eat p) n l*) (* CSC: TODO *)
695 let x = var_of_string x in
696 aux (instantiate p x n) n l
697 | `Auto -> aux (auto p n) n l
701 Console.print_hline();
703 let p_finale = aux p n cmds in
704 let freshno,sigma = p_finale.freshno, p_finale.sigma in
705 prerr_endline ("------- <DONE> ------\n " ^ (string_of_int (p.steps - p_finale.steps)) ^ " steps of "^ (string_of_int p.steps) ^".");
706 (* prerr_endline (print_problem "Original problem" p); *)
707 prerr_endline "---------------------";
708 let l = Array.to_list (Array.init (freshno + 1) string_of_var) in
709 prerr_endline (" BOMB == " ^ print ~l !bomb);
710 prerr_endline "---------------------";
711 List.iter (fun (x,inst) -> prerr_endline (string_of_var x ^ " := " ^ print ~l inst)) sigma;
713 prerr_endline "----------------------";
715 List.fold_left (fun ps (x,inst) ->
716 (* CSC: XXXX Is the subst always sorted correctly? Otherwise, implement a recursive subst *)
717 (* In this non-recursive version, the intermediate states may containt Matchs *)
718 List.map (fun t -> let t = subst false x inst (t :> nf) in cast_to_i_num_var t) ps)
719 (p.ps :> i_num_var list) sigma in
720 prerr_endline (print_problem {p with ps= List.map (function t -> cast_to_i_n_var t) ps; freshno});
721 List.iteri (fun i (n,more_args) -> assert (more_args = 0 && n = `N i)) ps ;
723 prerr_endline "---------<OPT>----------";
724 let sigma = optimize_numerals p_finale in (* optimize numerals *)
725 let l = Array.to_list (Array.init (freshno + 1) string_of_var) in
726 List.iter (fun (x,inst) -> prerr_endline (string_of_var x ^ " := " ^ print ~l inst)) sigma;
727 prerr_endline "---------<PURE>---------";
728 let div = option_map (fun div -> ToScott.t_of_nf (div :> nf)) p.div in
729 let conv = List.map (fun t -> ToScott.t_of_nf (t :> nf)) p.conv in
730 let ps = List.map (fun t -> ToScott.t_of_nf (t :> nf)) p.ps in
731 let sigma = List.map (fun (x,inst) -> x, ToScott.t_of_nf inst) sigma in
732 (*let ps_ok = List.fold_left (fun ps (x,inst) ->
733 List.map (Pure.subst false x inst) ps) ps sigma in*)
734 let e = env_of_sigma freshno sigma true in
735 let e' = env_of_sigma freshno sigma false in
738 prerr_endline "---------<PPP>---------";
740 "[" ^ String.concat ";" (List.map (fun (e,t,[]) -> print_e e ^ ":" ^ Pure.print t) e) ^ "]"
742 prerr_endline (print_e e);
743 List.iter (fun (t,t_ok) ->
744 prerr_endline ("T0= " ^ Pure.print t ^ "\nTM= " ^ Pure.print (Pure.unwind (e,t,[])) ^ "\nOM= " ^ Pure.print t_ok);
745 (*assert (Pure.unwind (e,t,[]) = t_ok)*)
746 ) (List.combine ps ps_ok);
748 prerr_endline "--------<REDUCE>---------";
749 (function Some div ->
750 print_endline (Pure.print div);
751 let t = Pure.mwhd (e',div,[]) in
752 prerr_endline ("*:: " ^ (Pure.print t));
753 prerr_endline (print !bomb);
754 assert (t = ToScott.t_of_nf (!bomb:>nf))
757 prerr_endline ("_::: " ^ (Pure.print n));
758 let t = Pure.mwhd (e,n,[]) in
759 prerr_endline ("_:: " ^ (Pure.print t))
761 List.iteri (fun i n ->
762 prerr_endline ((string_of_int i) ^ "::: " ^ (Pure.print n));
763 let t = Pure.mwhd (e,n,[]) in
764 prerr_endline ((string_of_int i) ^ ":: " ^ (Pure.print t));
765 assert (t = Scott.mk_n i)
767 prerr_endline "-------- </DONE> --------"
770 (********************** problems *******************)
777 | `Var _ as i -> cast_to_i_n_var (mk_app i zero)
781 let bounds_on_steps all_tms =
782 let rec aux = function
783 | `I(k,args) -> Listx.fold_left (fun acc t -> 1 + acc + (aux t)) 0 args
785 | `Lam (_, t) -> 1 + aux t
787 in List.fold_right ((+) ++ aux) all_tms 0
790 type t = problem * int * string list;;
792 let magic_conv ~div ~conv ~nums cmds =
793 let all_tms = (match div with None -> [] | Some div -> [div]) @ nums @ conv in
794 let all_tms, var_names = parse' all_tms in
795 let steps = bounds_on_steps all_tms in
796 let div, (tms, conv) = match div with
797 | None -> None, list_cut (List.length nums, all_tms)
798 | Some _ -> Some (List.hd all_tms), list_cut (List.length nums, List.tl all_tms) in
800 if match div with None -> false | Some div -> List.exists (eta_subterm div) (tms@conv)
802 prerr_endline "--- TEST SKIPPED ---";
803 {freshno=0; div=None; conv=[]; ps=[]; sigma=[]; deltas=[]; steps=(-1)}, 0, []
805 let tms = sort_uniq ~compare:eta_compare tms in
806 let special_k = compute_special_k (Listx.from_list all_tms) in (* compute initial special K *)
808 let div = option_map cast_to_i_var div in
809 let conv = List.map cast_to_i_n_var conv in
810 let tms = List.map cast_to_i_n_var tms in
812 let ps = List.map append_zero tms in (* crea lista applicando zeri o dummies *)
813 let freshno = List.length var_names in
815 let dummy = `Var (max_int / 2) in
816 [ ref (Array.to_list (Array.init (List.length ps) (fun i -> i, dummy))) ] in
818 {freshno; div; conv; ps; sigma=[] ; deltas; steps}, special_k, cmds
821 let magic strings cmds = magic_conv None [] strings cmds;;