2 ||M|| This file is part of HELM, an Hypertextual, Electronic
3 ||A|| Library of Mathematics, developed at the Computer Science
4 ||T|| Department, University of Bologna, Italy.
6 ||T|| HELM is free software; you can redistribute it and/or
7 ||A|| modify it under the terms of the GNU General Public License
8 \ / version 2 or (at your option) any later version.
9 \ / This software is distributed as is, NO WARRANTY.
10 V_______________________________________________________________ *)
15 module R = NCicReduction
16 module Ref = NReference
17 module S = NCicSubstitution
19 module E = NCicEnvironment
22 exception TypeCheckerFailure of string Lazy.t
23 exception AssertFailure of string Lazy.t
26 | Evil of int (* rno *)
27 | UnfFix of bool list (* fixed arguments *)
31 let is_dangerous i l =
32 List.exists (function (j,Evil _) when j=i -> true | _ -> false) l
36 List.exists (function (j,UnfFix _) when j=i -> true | _ -> false) l
40 List.exists (function (j,Safe) when j=i -> true | _ -> false) l
44 try match List.assoc i l with Evil rno -> rno | _ -> assert false
45 with Not_found -> assert false
48 let get_fixed_args i l =
49 try match List.assoc i l with UnfFix fa -> fa | _ -> assert false
50 with Not_found -> assert false
53 let shift_k e (c,rf,x) = e::c,List.map (fun (k,v) -> k+1,v) rf,x+1;;
55 let string_of_recfuns ~subst ~metasenv ~context l =
56 let pp = PP.ppterm ~subst ~metasenv ~context in
57 let safe, rest = List.partition (function (_,Safe) -> true | _ -> false) l in
58 let dang,unf = List.partition (function (_,UnfFix _)-> false | _->true)rest in
59 "\n\tsafes: "^String.concat "," (List.map (fun (i,_)->pp (C.Rel i)) safe) ^
60 "\n\tfix : "^String.concat ","
62 (function (i,UnfFix l)-> pp(C.Rel i)^"/"^String.concat "," (List.map
64 | _ ->assert false) unf) ^
65 "\n\trec : "^String.concat ","
67 (function (i,Evil rno)->pp(C.Rel i)^"/"^string_of_int rno
68 | _ -> assert false) dang)
71 let fixed_args bos j n nn =
72 let rec aux k acc = function
73 | C.Appl (C.Rel i::args) when i-k > n && i-k <= nn ->
74 let rec combine l1 l2 =
77 | he1::tl1, he2::tl2 -> (he1,he2)::combine tl1 tl2
78 | he::tl, [] -> (false,C.Rel ~-1)::combine tl [] (* dummy term *)
79 | [],_::_ -> assert false
81 let lefts, _ = HExtlib.split_nth (min j (List.length args)) args in
82 List.map (fun ((b,x),i) -> b && x = C.Rel (k-i))
83 (HExtlib.list_mapi (fun x i -> x,i) (combine acc lefts))
84 | t -> U.fold (fun _ k -> k+1) k aux acc t
86 List.fold_left (aux 0)
87 (let rec f = function 0 -> [] | n -> true :: f (n-1) in f j) bos
90 let rec list_iter_default2 f l1 def l2 =
93 | a::ta, b::tb -> f a b; list_iter_default2 f ta def tb
94 | a::ta, [] -> f a def; list_iter_default2 f ta def []
97 let rec split_prods ~subst context n te =
98 match (n, R.whd ~subst context te) with
99 | (0, _) -> context,te
100 | (n, C.Prod (name,so,ta)) when n > 0 ->
101 split_prods ~subst ((name,(C.Decl so))::context) (n - 1) ta
102 | (_, _) -> raise (AssertFailure (lazy "split_prods"))
105 let debruijn uri number_of_types context =
108 | C.Meta (i,(s,C.Ctx l)) ->
109 let l1 = HExtlib.sharing_map (aux (k-s)) l in
110 if l1 == l then t else C.Meta (i,(s,C.Ctx l1))
112 | C.Const (Ref.Ref (_,uri1,(Ref.Fix (no,_) | Ref.CoFix no)))
113 | C.Const (Ref.Ref (_,uri1,Ref.Ind (_,no))) when NUri.eq uri uri1 ->
114 C.Rel (k + number_of_types - no)
115 | t -> U.map (fun _ k -> k+1) k aux t
117 aux (List.length context)
120 let sort_of_prod ~metasenv ~subst context (name,s) (t1, t2) =
121 let t1 = R.whd ~subst context t1 in
122 let t2 = R.whd ~subst ((name,C.Decl s)::context) t2 in
124 | C.Sort s1, C.Sort C.Prop -> t2
125 | C.Sort (C.Type u1), C.Sort (C.Type u2) -> C.Sort (C.Type (max u1 u2))
126 | C.Sort _,C.Sort (C.Type _) -> t2
127 | C.Sort (C.Type _) , C.Sort C.CProp -> t1
128 | C.Sort _, C.Sort C.CProp
129 | C.Meta (_,(_,(C.Irl 0 | C.Ctx []))), C.Sort _
130 | C.Meta (_,(_,(C.Irl 0 | C.Ctx []))), C.Meta (_,(_,(C.Irl 0 | C.Ctx [])))
131 | C.Sort _, C.Meta (_,(_,(C.Irl 0 | C.Ctx []))) -> t2
133 raise (TypeCheckerFailure (lazy (Printf.sprintf
134 "Prod: expected two sorts, found = %s, %s"
135 (PP.ppterm ~subst ~metasenv ~context t1)
136 (PP.ppterm ~subst ~metasenv ~context t2))))
139 let eat_prods ~subst ~metasenv context he ty_he args_with_ty =
140 let rec aux ty_he = function
142 | (arg, ty_arg)::tl ->
143 match R.whd ~subst context ty_he with
146 prerr_endline (PP.ppterm ~subst ~metasenv ~context s ^ " - Vs - "
147 ^ PP.ppterm ~subst ~metasenv ~context ty_arg);
148 prerr_endline (PP.ppterm ~subst ~metasenv ~context
149 (S.subst ~avoid_beta_redexes:true arg t));
151 if R.are_convertible ~subst context ty_arg s then
152 aux (S.subst ~avoid_beta_redexes:true arg t) tl
156 (lazy (Printf.sprintf
157 ("Appl: wrong application of %s: the parameter %s has type"^^
158 "\n%s\nbut it should have type \n%s\nContext:\n%s\n")
159 (PP.ppterm ~subst ~metasenv ~context he)
160 (PP.ppterm ~subst ~metasenv ~context arg)
161 (PP.ppterm ~subst ~metasenv ~context ty_arg)
162 (PP.ppterm ~subst ~metasenv ~context s)
163 (PP.ppcontext ~subst ~metasenv context))))
167 (lazy (Printf.sprintf
168 "Appl: %s is not a function, it cannot be applied"
169 (PP.ppterm ~subst ~metasenv ~context
170 (let res = List.length tl in
171 let eaten = List.length args_with_ty - res in
174 (fst (HExtlib.split_nth eaten args_with_ty)))))))))
176 aux ty_he args_with_ty
179 (* instantiate_parameters ps (x1:T1)...(xn:Tn)C *)
180 (* returns ((x_|ps|:T_|ps|)...(xn:Tn)C){ps_1 / x1 ; ... ; ps_|ps| / x_|ps|} *)
181 let rec instantiate_parameters params c =
184 | C.Prod (_,_,ta), he::tl -> instantiate_parameters tl (S.subst he ta)
185 | t,l -> raise (AssertFailure (lazy "1"))
188 let specialize_inductive_type_constrs ~subst context ty_term =
189 match R.whd ~subst context ty_term with
190 | C.Const (Ref.Ref (_,uri,Ref.Ind (_,i)) as ref)
191 | C.Appl (C.Const (Ref.Ref (_,uri,Ref.Ind (_,i)) as ref) :: _ ) as ty ->
192 let args = match ty with C.Appl (_::tl) -> tl | _ -> [] in
193 let is_ind, leftno, itl, attrs, i = E.get_checked_indtys ref in
194 let left_args,_ = HExtlib.split_nth leftno args in
195 let _,_,_,cl = List.nth itl i in
197 (fun (rel,name,ty) -> rel, name, instantiate_parameters left_args ty) cl
201 let specialize_and_abstract_constrs ~subst r_uri r_len context ty_term =
202 let cl = specialize_inductive_type_constrs ~subst context ty_term in
203 let len = List.length context in
205 match E.get_checked_obj r_uri with
206 | _,_,_,_, NCic.Inductive (_,_,tys,_) ->
207 context @ List.map (fun (_,name,arity,_) -> name,C.Decl arity) tys
211 List.map (fun (_,id,ty) -> id, debruijn r_uri r_len context ty) cl,
215 exception DoesOccur;;
217 let does_not_occur ~subst context n nn t =
218 let rec aux k _ = function
219 | C.Rel m when m > n+k && m <= nn+k -> raise DoesOccur
220 | C.Rel m when m <= k || m > nn+k -> ()
222 (try match List.nth context (m-1-k) with
223 | _,C.Def (bo,_) -> aux (n-m) () bo
225 with Failure _ -> assert false)
226 | C.Meta (_,(_,(C.Irl 0 | C.Ctx []))) -> (* closed meta *) ()
227 | C.Meta (mno,(s,l)) ->
229 (* possible optimization here: try does_not_occur on l and
230 perform substitution only if DoesOccur is raised *)
231 let _,_,term,_ = U.lookup_subst mno subst in
232 aux (k-s) () (S.subst_meta (0,l) term)
233 with U.Subst_not_found _ -> match l with
234 | C.Irl len -> if not (n+k >= s+len || s > nn+k) then raise DoesOccur
235 | C.Ctx lc -> List.iter (aux (k-s) ()) lc)
236 | t -> U.fold (fun _ k -> k + 1) k aux () t
239 with DoesOccur -> false
242 let rec eat_lambdas ~subst ~metasenv context n te =
243 match (n, R.whd ~subst context te) with
244 | (0, _) -> (te, context)
245 | (n, C.Lambda (name,so,ta)) when n > 0 ->
246 eat_lambdas ~subst ~metasenv ((name,(C.Decl so))::context) (n - 1) ta
248 raise (AssertFailure (lazy (Printf.sprintf "eat_lambdas (%d, %s)" n
249 (PP.ppterm ~subst ~metasenv ~context te))))
252 let rec eat_or_subst_lambdas ~subst ~metasenv n te to_be_subst args
253 (context, recfuns, x as k)
255 match n, R.whd ~subst context te, to_be_subst, args with
256 | (n, C.Lambda (name,so,ta),true::to_be_subst,arg::args) when n > 0 ->
257 eat_or_subst_lambdas ~subst ~metasenv (n - 1) (S.subst arg ta)
259 | (n, C.Lambda (name,so,ta),false::to_be_subst,arg::args) when n > 0 ->
260 eat_or_subst_lambdas ~subst ~metasenv (n - 1) ta to_be_subst args
261 (shift_k (name,(C.Decl so)) k)
262 | (_, te, _, _) -> te, k
266 (*CSC l'indice x dei tipi induttivi e' t.c. n < x <= nn *)
267 (*CSC questa funzione e' simile alla are_all_occurrences_positive, ma fa *)
268 (*CSC dei controlli leggermente diversi. Viene invocata solamente dalla *)
269 (*CSC strictly_positive *)
270 (*CSC definizione (giusta???) tratta dalla mail di Hugo ;-) *)
271 let rec weakly_positive ~subst context n nn uri te =
272 (*CSC: Che schifo! Bisogna capire meglio e trovare una soluzione ragionevole!*)
273 let dummy = C.Sort (C.Type ~-1) in
274 (*CSC: mettere in cicSubstitution *)
275 let rec subst_inductive_type_with_dummy _ = function
276 | C.Const (Ref.Ref (_,uri',Ref.Ind (true,0))) when NUri.eq uri' uri -> dummy
277 | C.Appl ((C.Const (Ref.Ref (_,uri',Ref.Ind (true,0))))::tl)
278 when NUri.eq uri' uri -> dummy
279 | t -> U.map (fun _ x->x) () subst_inductive_type_with_dummy t
281 match R.whd context te with
282 | C.Const (Ref.Ref (_,uri',Ref.Ind _))
283 | C.Appl ((C.Const (Ref.Ref (_,uri',Ref.Ind _)))::_)
284 when NUri.eq uri' uri -> true
285 | C.Prod (name,source,dest) when
286 does_not_occur ~subst ((name,C.Decl source)::context) 0 1 dest ->
287 (* dummy abstraction, so we behave as in the anonimous case *)
288 strictly_positive ~subst context n nn
289 (subst_inductive_type_with_dummy () source) &&
290 weakly_positive ~subst ((name,C.Decl source)::context)
291 (n + 1) (nn + 1) uri dest
292 | C.Prod (name,source,dest) ->
293 does_not_occur ~subst context n nn
294 (subst_inductive_type_with_dummy () source)&&
295 weakly_positive ~subst ((name,C.Decl source)::context)
296 (n + 1) (nn + 1) uri dest
298 raise (TypeCheckerFailure (lazy "Malformed inductive constructor type"))
300 and strictly_positive ~subst context n nn te =
301 match R.whd context te with
302 | t when does_not_occur ~subst context n nn t -> true
304 | C.Prod (name,so,ta) ->
305 does_not_occur ~subst context n nn so &&
306 strictly_positive ~subst ((name,C.Decl so)::context) (n+1) (nn+1) ta
307 | C.Appl ((C.Rel m)::tl) when m > n && m <= nn ->
308 List.for_all (does_not_occur ~subst context n nn) tl
309 | C.Appl (C.Const (Ref.Ref (_,uri,Ref.Ind (_,i)) as r)::tl) ->
310 let _,paramsno,tyl,_,i = E.get_checked_indtys r in
311 let _,name,ity,cl = List.nth tyl i in
312 let ok = List.length tyl = 1 in
313 let params, arguments = HExtlib.split_nth paramsno tl in
314 let lifted_params = List.map (S.lift 1) params in
316 List.map (fun (_,_,te) -> instantiate_parameters lifted_params te) cl
319 List.for_all (does_not_occur ~subst context n nn) arguments &&
321 (weakly_positive ~subst ((name,C.Decl ity)::context) (n+1) (nn+1) uri) cl
324 (* the inductive type indexes are s.t. n < x <= nn *)
325 and are_all_occurrences_positive ~subst context uri indparamsno i n nn te =
326 match R.whd context te with
327 | C.Appl ((C.Rel m)::tl) as reduct when m = i ->
333 match R.whd context x with
334 | C.Rel m when m = n - (indparamsno - k) -> k - 1
335 | y -> raise (TypeCheckerFailure (lazy
336 ("Argument "^string_of_int (indparamsno - k + 1) ^ " (of " ^
337 string_of_int indparamsno ^ " fixed) is not homogeneous in "^
338 "appl:\n"^ PP.ppterm ~context ~subst ~metasenv:[] reduct))))
342 List.for_all (does_not_occur ~subst context n nn) tl
344 raise (TypeCheckerFailure
345 (lazy ("Non-positive occurence in mutual inductive definition(s) [2]"^
346 NUri.string_of_uri uri)))
347 | C.Rel m when m = i ->
348 if indparamsno = 0 then
351 raise (TypeCheckerFailure
352 (lazy ("Non-positive occurence in mutual inductive definition(s) [3]"^
353 NUri.string_of_uri uri)))
354 | C.Prod (name,source,dest) when
355 does_not_occur ~subst ((name,C.Decl source)::context) 0 1 dest ->
356 strictly_positive ~subst context n nn source &&
357 are_all_occurrences_positive ~subst
358 ((name,C.Decl source)::context) uri indparamsno
359 (i+1) (n + 1) (nn + 1) dest
360 | C.Prod (name,source,dest) ->
361 if not (does_not_occur ~subst context n nn source) then
362 raise (TypeCheckerFailure (lazy ("Non-positive occurrence in "^
363 PP.ppterm ~context ~metasenv:[] ~subst te)));
364 are_all_occurrences_positive ~subst ((name,C.Decl source)::context)
365 uri indparamsno (i+1) (n + 1) (nn + 1) dest
368 (TypeCheckerFailure (lazy ("Malformed inductive constructor type " ^
369 (NUri.string_of_uri uri))))
372 exception NotGuarded of string Lazy.t;;
374 let rec typeof ~subst ~metasenv context term =
375 let rec typeof_aux context =
376 fun t -> (*prerr_endline (PP.ppterm ~metasenv ~subst ~context t);*)
380 match List.nth context (n - 1) with
381 | (_,C.Decl ty) -> S.lift n ty
382 | (_,C.Def (_,ty)) -> S.lift n ty
383 with Failure _ -> raise (TypeCheckerFailure (lazy "unbound variable")))
384 | C.Sort (C.Type i) -> C.Sort (C.Type (i+1))
385 | C.Sort s -> C.Sort (C.Type 0)
386 | C.Implicit _ -> raise (AssertFailure (lazy "Implicit found"))
387 | C.Meta (n,l) as t ->
388 let canonical_ctx,ty =
390 let _,c,_,ty = U.lookup_subst n subst in c,ty
391 with U.Subst_not_found _ -> try
392 let _,c,ty = U.lookup_meta n metasenv in c,ty
393 with U.Meta_not_found _ ->
394 raise (AssertFailure (lazy (Printf.sprintf
395 "%s not found" (PP.ppterm ~subst ~metasenv ~context t))))
397 check_metasenv_consistency t ~subst ~metasenv context canonical_ctx l;
399 | C.Const ref -> type_of_constant ref
400 | C.Prod (name,s,t) ->
401 let sort1 = typeof_aux context s in
402 let sort2 = typeof_aux ((name,(C.Decl s))::context) t in
403 sort_of_prod ~metasenv ~subst context (name,s) (sort1,sort2)
404 | C.Lambda (n,s,t) ->
405 let sort = typeof_aux context s in
406 (match R.whd ~subst context sort with
407 | C.Meta _ | C.Sort _ -> ()
410 (TypeCheckerFailure (lazy (Printf.sprintf
411 ("Not well-typed lambda-abstraction: " ^^
412 "the source %s should be a type; instead it is a term " ^^
413 "of type %s") (PP.ppterm ~subst ~metasenv ~context s)
414 (PP.ppterm ~subst ~metasenv ~context sort)))));
415 let ty = typeof_aux ((n,(C.Decl s))::context) t in
417 | C.LetIn (n,ty,t,bo) ->
418 let ty_t = typeof_aux context t in
419 let _ = typeof_aux context ty in
420 if not (R.are_convertible ~subst context ty ty_t) then
423 (lazy (Printf.sprintf
424 "The type of %s is %s but it is expected to be %s"
425 (PP.ppterm ~subst ~metasenv ~context t)
426 (PP.ppterm ~subst ~metasenv ~context ty_t)
427 (PP.ppterm ~subst ~metasenv ~context ty))))
429 let ty_bo = typeof_aux ((n,C.Def (t,ty))::context) bo in
430 S.subst ~avoid_beta_redexes:true t ty_bo
431 | C.Appl (he::(_::_ as args)) ->
432 let ty_he = typeof_aux context he in
433 let args_with_ty = List.map (fun t -> t, typeof_aux context t) args in
435 prerr_endline ("HEAD: " ^ PP.ppterm ~subst ~metasenv ~context ty_he);
436 prerr_endline ("TARGS: " ^ String.concat " | " (List.map (PP.ppterm
437 ~subst ~metasenv ~context) (List.map snd args_with_ty)));
438 prerr_endline ("ARGS: " ^ String.concat " | " (List.map (PP.ppterm
439 ~subst ~metasenv ~context) (List.map fst args_with_ty)));
441 eat_prods ~subst ~metasenv context he ty_he args_with_ty
442 | C.Appl _ -> raise (AssertFailure (lazy "Appl of length < 2"))
443 | C.Match (Ref.Ref (_,_,Ref.Ind (_,tyno)) as r,outtype,term,pl) ->
444 let outsort = typeof_aux context outtype in
445 let inductive,leftno,itl,_,_ = E.get_checked_indtys r in
447 let _,_,_,cl = List.nth itl tyno in List.length cl
449 let parameters, arguments =
450 let ty = R.whd ~subst context (typeof_aux context term) in
453 C.Const (Ref.Ref (_,_,Ref.Ind _) as r') -> r',[]
454 | C.Appl (C.Const (Ref.Ref (_,_,Ref.Ind _) as r') :: tl) -> r',tl
457 (TypeCheckerFailure (lazy (Printf.sprintf
458 "Case analysis: analysed term %s is not an inductive one"
459 (PP.ppterm ~subst ~metasenv ~context term)))) in
460 if not (Ref.eq r r') then
462 (TypeCheckerFailure (lazy (Printf.sprintf
463 ("Case analysys: analysed term type is %s, but is expected " ^^
464 "to be (an application of) %s")
465 (PP.ppterm ~subst ~metasenv ~context ty)
466 (PP.ppterm ~subst ~metasenv ~context (C.Const r')))))
468 try HExtlib.split_nth leftno tl
471 raise (TypeCheckerFailure (lazy (Printf.sprintf
472 "%s is partially applied"
473 (PP.ppterm ~subst ~metasenv ~context ty)))) in
474 (* let's control if the sort elimination is allowed: [(I q1 ... qr)|B] *)
475 let sort_of_ind_type =
476 if parameters = [] then C.Const r
477 else C.Appl ((C.Const r)::parameters) in
478 let type_of_sort_of_ind_ty = typeof_aux context sort_of_ind_type in
479 check_allowed_sort_elimination ~subst ~metasenv r context
480 sort_of_ind_type type_of_sort_of_ind_ty outsort;
481 (* let's check if the type of branches are right *)
482 if List.length pl <> constructorsno then
483 raise (TypeCheckerFailure (lazy ("Wrong number of cases in a match")));
484 let j,branches_ok,p_ty, exp_p_ty =
486 (fun (j,b,old_p_ty,old_exp_p_ty) p ->
489 let cons = Ref.mk_constructor j r in
490 if parameters = [] then C.Const cons
491 else C.Appl (C.Const cons::parameters)
493 let ty_p = typeof_aux context p in
494 let ty_cons = typeof_aux context cons in
496 type_of_branch ~subst context leftno outtype cons ty_cons 0
498 j+1, R.are_convertible ~subst context ty_p ty_branch,
501 j,false,old_p_ty,old_exp_p_ty
502 ) (1,true,C.Sort C.Prop,C.Sort C.Prop) pl
504 if not branches_ok then
507 (lazy (Printf.sprintf ("Branch for constructor %s :=\n%s\n"^^
508 "has type %s\nnot convertible with %s")
509 (PP.ppterm ~subst ~metasenv ~context
510 (C.Const (Ref.mk_constructor (j-1) r)))
511 (PP.ppterm ~metasenv ~subst ~context (List.nth pl (j-2)))
512 (PP.ppterm ~metasenv ~subst ~context p_ty)
513 (PP.ppterm ~metasenv ~subst ~context exp_p_ty))));
514 let res = outtype::arguments@[term] in
515 R.head_beta_reduce (C.Appl res)
516 | C.Match _ -> assert false
518 and type_of_branch ~subst context leftno outty cons tycons liftno =
519 match R.whd ~subst context tycons with
520 | C.Const (Ref.Ref (_,_,Ref.Ind _)) -> C.Appl [S.lift liftno outty ; cons]
521 | C.Appl (C.Const (Ref.Ref (_,_,Ref.Ind _))::tl) ->
522 let _,arguments = HExtlib.split_nth leftno tl in
523 C.Appl (S.lift liftno outty::arguments@[cons])
524 | C.Prod (name,so,de) ->
526 match S.lift 1 cons with
527 | C.Appl l -> C.Appl (l@[C.Rel 1])
528 | t -> C.Appl [t ; C.Rel 1]
531 type_of_branch ~subst ((name,(C.Decl so))::context)
532 leftno outty cons de (liftno+1))
533 | _ -> raise (AssertFailure (lazy "type_of_branch"))
535 (* check_metasenv_consistency checks that the "canonical" context of a
536 metavariable is consitent - up to relocation via the relocation list l -
537 with the actual context *)
538 and check_metasenv_consistency
539 ~subst ~metasenv term context canonical_context l
543 let context = snd (HExtlib.split_nth shift context) in
544 let rec compare = function
548 raise (AssertFailure (lazy (Printf.sprintf
549 "Local and canonical context %s have different lengths"
550 (PP.ppterm ~subst ~context ~metasenv term))))
552 raise (TypeCheckerFailure (lazy (Printf.sprintf
553 "Unbound variable -%d in %s" m
554 (PP.ppterm ~subst ~metasenv ~context term))))
557 (_,C.Decl t1), (_,C.Decl t2)
558 | (_,C.Def (t1,_)), (_,C.Def (t2,_))
559 | (_,C.Def (_,t1)), (_,C.Decl t2) ->
560 if not (R.are_convertible ~subst tl t1 t2) then
563 (lazy (Printf.sprintf
564 ("Not well typed metavariable local context for %s: " ^^
565 "%s expected, which is not convertible with %s")
566 (PP.ppterm ~subst ~metasenv ~context term)
567 (PP.ppterm ~subst ~metasenv ~context t2)
568 (PP.ppterm ~subst ~metasenv ~context t1))))
571 (TypeCheckerFailure (lazy (Printf.sprintf
572 ("Not well typed metavariable local context for %s: " ^^
573 "a definition expected, but a declaration found")
574 (PP.ppterm ~subst ~metasenv ~context term)))));
575 compare (m - 1,tl,ctl)
577 compare (n,context,canonical_context)
579 (* we avoid useless lifting by shortening the context*)
580 let l,context = (0,lc_kind), snd (HExtlib.split_nth shift context) in
581 let lifted_canonical_context =
582 let rec lift_metas i = function
584 | (n,C.Decl t)::tl ->
585 (n,C.Decl (S.subst_meta l (S.lift i t)))::(lift_metas (i+1) tl)
586 | (n,C.Def (t,ty))::tl ->
587 (n,C.Def ((S.subst_meta l (S.lift i t)),
588 S.subst_meta l (S.lift i ty)))::(lift_metas (i+1) tl)
590 lift_metas 1 canonical_context in
591 let l = U.expand_local_context lc_kind in
596 | t, (_,C.Def (ct,_)) ->
597 (*CSC: the following optimization is to avoid a possibly expensive
598 reduction that can be easily avoided and that is quite
599 frequent. However, this is better handled using levels to
605 match List.nth context (n - 1) with
606 | (_,C.Def (te,_)) -> S.lift n te
611 if not (R.are_convertible ~subst context optimized_t ct)
615 (lazy (Printf.sprintf
616 ("Not well typed metavariable local context: " ^^
617 "expected a term convertible with %s, found %s")
618 (PP.ppterm ~subst ~metasenv ~context ct)
619 (PP.ppterm ~subst ~metasenv ~context t))))
620 | t, (_,C.Decl ct) ->
621 let type_t = typeof_aux context t in
622 if not (R.are_convertible ~subst context type_t ct) then
623 raise (TypeCheckerFailure
624 (lazy (Printf.sprintf
625 ("Not well typed metavariable local context: "^^
626 "expected a term of type %s, found %s of type %s")
627 (PP.ppterm ~subst ~metasenv ~context ct)
628 (PP.ppterm ~subst ~metasenv ~context t)
629 (PP.ppterm ~subst ~metasenv ~context type_t))))
630 ) l lifted_canonical_context
632 Invalid_argument _ ->
633 raise (AssertFailure (lazy (Printf.sprintf
634 "Local and canonical context %s have different lengths"
635 (PP.ppterm ~subst ~metasenv ~context term))))
637 and is_non_informative context paramsno c =
638 let rec aux context c =
639 match R.whd context c with
640 | C.Prod (n,so,de) ->
641 let s = typeof_aux context so in
642 s = C.Sort C.Prop && aux ((n,(C.Decl so))::context) de
644 let context',dx = split_prods ~subst:[] context paramsno c in
647 and check_allowed_sort_elimination ~subst ~metasenv r =
650 | C.Appl l -> C.Appl (l @ [arg])
651 | t -> C.Appl [t;arg] in
652 let rec aux context ind arity1 arity2 =
653 let arity1 = R.whd ~subst context arity1 in
654 let arity2 = R.whd ~subst context arity2 in
655 match arity1,arity2 with
656 | C.Prod (name,so1,de1), C.Prod (_,so2,de2) ->
657 if not (R.are_convertible ~subst context so1 so2) then
658 raise (TypeCheckerFailure (lazy (Printf.sprintf
659 "In outtype: expected %s, found %s"
660 (PP.ppterm ~subst ~metasenv ~context so1)
661 (PP.ppterm ~subst ~metasenv ~context so2)
663 aux ((name, C.Decl so1)::context)
664 (mkapp (S.lift 1 ind) (C.Rel 1)) de1 de2
665 | C.Sort _, C.Prod (name,so,ta) ->
666 if not (R.are_convertible ~subst context so ind) then
667 raise (TypeCheckerFailure (lazy (Printf.sprintf
668 "In outtype: expected %s, found %s"
669 (PP.ppterm ~subst ~metasenv ~context ind)
670 (PP.ppterm ~subst ~metasenv ~context so)
672 (match arity1,ta with
673 | (C.Sort (C.CProp | C.Type _), C.Sort _)
674 | (C.Sort C.Prop, C.Sort C.Prop) -> ()
675 | (C.Sort C.Prop, C.Sort (C.CProp | C.Type _)) ->
676 (* TODO: we should pass all these parameters since we
677 * have them already *)
678 let inductive,leftno,itl,_,i = E.get_checked_indtys r in
679 let itl_len = List.length itl in
680 let _,name,ty,cl = List.nth itl i in
681 let cl_len = List.length cl in
682 (* is it a singleton or empty non recursive and non informative
686 (itl_len = 1 && cl_len = 1 &&
687 is_non_informative [name,C.Decl ty] leftno
688 (let _,_,x = List.nth cl 0 in x)))
690 raise (TypeCheckerFailure (lazy
691 ("Sort elimination not allowed")));
698 typeof_aux context term
700 and check_mutual_inductive_defs uri ~metasenv ~subst is_ind leftno tyl =
701 (* let's check if the arity of the inductive types are well formed *)
702 List.iter (fun (_,_,x,_) -> ignore (typeof ~subst ~metasenv [] x)) tyl;
703 (* let's check if the types of the inductive constructors are well formed. *)
704 let len = List.length tyl in
705 let tys = List.rev (List.map (fun (_,n,ty,_) -> (n,(C.Decl ty))) tyl) in
711 let debruijnedte = debruijn uri len [] te in
712 ignore (typeof ~subst ~metasenv tys debruijnedte);
713 (* let's check also the positivity conditions *)
716 (are_all_occurrences_positive ~subst tys uri leftno i 0 len
721 (lazy ("Non positive occurence in "^NUri.string_of_uri uri))))
726 and guarded_by_destructors r_uri r_len ~subst ~metasenv context recfuns t =
727 let recursor f k t = U.fold shift_k k (fun k () -> f k) () t in
728 let rec aux (context, recfuns, x as k) t =
730 prerr_endline ("GB:\n" ^
731 PP.ppcontext ~subst ~metasenv context^
732 PP.ppterm ~metasenv ~subst ~context t^
733 string_of_recfuns ~subst ~metasenv ~context recfuns);
737 | C.Rel m as t when is_dangerous m recfuns ->
738 raise (NotGuarded (lazy
739 (PP.ppterm ~subst ~metasenv ~context t ^
740 " is a partial application of a fix")))
741 | C.Appl ((C.Rel m)::tl) as t when is_dangerous m recfuns ->
742 let rec_no = get_recno m recfuns in
743 if not (List.length tl > rec_no) then
744 raise (NotGuarded (lazy
745 (PP.ppterm ~context ~subst ~metasenv t ^
746 " is a partial application of a fix")))
748 let rec_arg = List.nth tl rec_no in
749 if not (is_really_smaller r_uri r_len ~subst ~metasenv k rec_arg) then
750 raise (NotGuarded (lazy (Printf.sprintf ("Recursive call %s, %s is not"
751 ^^ " smaller.\ncontext:\n%s") (PP.ppterm ~context ~subst ~metasenv
752 t) (PP.ppterm ~context ~subst ~metasenv rec_arg)
753 (PP.ppcontext ~subst ~metasenv context))));
755 | C.Appl ((C.Rel m)::tl) when is_unfolded m recfuns ->
756 let fixed_args = get_fixed_args m recfuns in
757 list_iter_default2 (fun x b -> if not b then aux k x) tl false fixed_args
759 (match List.nth context (m-1) with
761 | _,C.Def (bo,_) -> aux k (S.lift m bo))
763 | C.Appl (C.Const ((Ref.Ref (_,uri,Ref.Fix (i,recno))) as r)::args) ->
764 if List.exists (fun t -> try aux k t;false with NotGuarded _ -> true) args
766 let fl,_,_ = E.get_checked_fixes_or_cofixes r in
768 List.split (List.map (fun (_,name,_,ty,bo) -> (name, C.Decl ty), bo) fl)
770 let fl_len = List.length fl in
771 let bos = List.map (debruijn uri fl_len context) bos in
772 let j = List.fold_left min max_int (List.map (fun (_,_,i,_,_)->i) fl) in
773 let ctx_len = List.length context in
774 (* we may look for fixed params not only up to j ... *)
775 let fa = fixed_args bos j ctx_len (ctx_len + fl_len) in
776 list_iter_default2 (fun x b -> if not b then aux k x) args false fa;
777 let context = context@ctx_tys in
778 let ctx_len = List.length context in
780 HExtlib.list_mapi (fun _ i -> ctx_len - i, UnfFix fa) ctx_tys
782 let new_k = context, extra_recfuns@recfuns, x in
787 eat_or_subst_lambdas ~subst ~metasenv j bo fa args new_k
791 List.length args > recno &&
792 (*case where the recursive argument is already really_smaller *)
793 is_really_smaller r_uri r_len ~subst ~metasenv k
794 (List.nth args recno)
796 let bo,(context, _, _ as new_k) = bo_and_k in
798 eat_lambdas ~subst ~metasenv context (recno + 1 - j) bo in
799 let new_context_part,_ =
800 HExtlib.split_nth (List.length context' - List.length context)
802 let k = List.fold_right shift_k new_context_part new_k in
803 let context, recfuns, x = k in
804 let k = context, (1,Safe)::recfuns, x in
810 List.iter (fun (bo,k) -> aux k bo) bos_and_ks
811 | C.Match (Ref.Ref (_,uri,Ref.Ind (true,_)),outtype,term,pl) as t ->
812 (match R.whd ~subst context term with
813 | C.Rel m | C.Appl (C.Rel m :: _ ) as t when is_safe m recfuns || m = x ->
814 let ty = typeof ~subst ~metasenv context term in
815 let dc_ctx, dcl, start, stop =
816 specialize_and_abstract_constrs ~subst r_uri r_len context ty in
817 let args = match t with C.Appl (_::tl) -> tl | _ -> [] in
819 List.iter (aux k) args;
822 let rl = recursive_args ~subst ~metasenv dc_ctx start stop dc in
823 let p, k = get_new_safes ~subst k p rl in
826 | _ -> recursor aux k t)
827 | t -> recursor aux k t
829 NotGuarded _ as exc ->
830 let t' = R.whd ~delta:0 ~subst context t in
831 if t = t' then raise exc
834 try aux (context, recfuns, 1) t
835 with NotGuarded s -> raise (TypeCheckerFailure s)
837 and guarded_by_constructors ~subst ~metasenv context t indURI indlen nn =
838 let rec aux context n nn h te =
839 match R.whd ~subst context te with
840 | C.Rel m when m > n && m <= nn -> h
841 | C.Rel _ | C.Meta _ -> true
845 | C.Const (Ref.Ref (_,_,Ref.Ind _))
846 | C.LetIn _ -> raise (AssertFailure (lazy "17"))
847 | C.Lambda (name,so,de) ->
848 does_not_occur ~subst context n nn so &&
849 aux ((name,C.Decl so)::context) (n + 1) (nn + 1) h de
850 | C.Appl ((C.Rel m)::tl) when m > n && m <= nn ->
851 h && List.for_all (does_not_occur ~subst context n nn) tl
852 | C.Const (Ref.Ref (_,_,Ref.Con _)) -> true
853 | C.Appl (C.Const (Ref.Ref (_,uri, Ref.Con (_,j)) as ref) :: tl) as t ->
854 let _, paramsno, _, _, _ = E.get_checked_indtys ref in
855 let ty_t = typeof ~subst ~metasenv context t in
856 let dc_ctx, dcl, start, stop =
857 specialize_and_abstract_constrs ~subst indURI indlen context ty_t in
858 let _, dc = List.nth dcl (j-1) in
860 prerr_endline (PP.ppterm ~subst ~metasenv ~context:dc_ctx dc);
861 prerr_endline (PP.ppcontext ~subst ~metasenv dc_ctx);
863 let rec_params = recursive_args ~subst ~metasenv dc_ctx start stop dc in
864 let rec analyse_instantiated_type rec_spec args =
865 match rec_spec, args with
866 | h::rec_spec, he::args ->
867 aux context n nn h he && analyse_instantiated_type rec_spec args
869 | _ -> raise (AssertFailure (lazy
870 ("Too many args for constructor: " ^ String.concat " "
871 (List.map (fun x-> PP.ppterm ~subst ~metasenv ~context x) args))))
873 let left, args = HExtlib.split_nth paramsno tl in
874 List.for_all (does_not_occur ~subst context n nn) left &&
875 analyse_instantiated_type rec_params args
876 | C.Appl ((C.Match (_,out,te,pl))::_)
877 | C.Match (_,out,te,pl) as t ->
878 let tl = match t with C.Appl (_::tl) -> tl | _ -> [] in
879 List.for_all (does_not_occur ~subst context n nn) tl &&
880 does_not_occur ~subst context n nn out &&
881 does_not_occur ~subst context n nn te &&
882 List.for_all (aux context n nn h) pl
883 | C.Const (Ref.Ref (_,u,(Ref.Fix _| Ref.CoFix _)) as ref)
884 | C.Appl(C.Const (Ref.Ref(_,u,(Ref.Fix _| Ref.CoFix _)) as ref) :: _) as t ->
885 let tl = match t with C.Appl (_::tl) -> tl | _ -> [] in
886 let fl,_,_ = E.get_checked_fixes_or_cofixes ref in
887 let len = List.length fl in
888 let tys = List.map (fun (_,n,_,ty,_) -> n, C.Decl ty) fl in
889 List.for_all (does_not_occur ~subst context n nn) tl &&
892 aux (context@tys) n nn h (debruijn u len context bo))
895 | C.Appl _ as t -> does_not_occur ~subst context n nn t
897 aux context 0 nn false t
899 and recursive_args ~subst ~metasenv context n nn te =
900 match R.whd context te with
901 | C.Rel _ | C.Appl _ | C.Const _ -> []
902 | C.Prod (name,so,de) ->
903 (not (does_not_occur ~subst context n nn so)) ::
904 (recursive_args ~subst ~metasenv
905 ((name,(C.Decl so))::context) (n+1) (nn + 1) de)
907 raise (AssertFailure (lazy ("recursive_args:" ^ PP.ppterm ~subst
908 ~metasenv ~context:[] t)))
910 and get_new_safes ~subst (context, recfuns, x as k) p rl =
911 match R.whd ~subst context p, rl with
912 | C.Lambda (name,so,ta), b::tl ->
913 let recfuns = (if b then [0,Safe] else []) @ recfuns in
915 (shift_k (name,(C.Decl so)) (context, recfuns, x)) ta tl
916 | C.Meta _ as e, _ | e, [] -> e, k
917 | _ -> raise (AssertFailure (lazy "Ill formed pattern"))
919 and is_really_smaller
920 r_uri r_len ~subst ~metasenv (context, recfuns, x as k) te
922 match R.whd ~subst context te with
923 | C.Rel m when is_safe m recfuns -> true
924 | C.Lambda (name, s, t) ->
925 is_really_smaller r_uri r_len ~subst ~metasenv (shift_k (name,C.Decl s) k) t
927 is_really_smaller r_uri r_len ~subst ~metasenv k he
929 | C.Const (Ref.Ref (_,_,Ref.Con _)) -> false
931 | C.Const (Ref.Ref (_,_,Ref.Fix _)) -> assert false
933 | C.Match (Ref.Ref (_,uri,_) as ref,outtype,term,pl) ->
935 | C.Rel m | C.Appl (C.Rel m :: _ ) when is_safe m recfuns || m = x ->
936 (* TODO: add CoInd to references so that this call is useless *)
937 let isinductive, _, _, _, _ = E.get_checked_indtys ref in
938 if not isinductive then
939 List.for_all (is_really_smaller r_uri r_len ~subst ~metasenv k) pl
941 let ty = typeof ~subst ~metasenv context term in
942 let dc_ctx, dcl, start, stop =
943 specialize_and_abstract_constrs ~subst r_uri r_len context ty in
946 let rl = recursive_args ~subst ~metasenv dc_ctx start stop dc in
947 let e, k = get_new_safes ~subst k p rl in
948 is_really_smaller r_uri r_len ~subst ~metasenv k e)
950 | _ -> List.for_all (is_really_smaller r_uri r_len ~subst ~metasenv k) pl)
953 and returns_a_coinductive ~subst context ty =
954 match R.whd ~subst context ty with
955 | C.Const (Ref.Ref (_,uri,Ref.Ind (false,_)) as ref)
956 | C.Appl (C.Const (Ref.Ref (_,uri,Ref.Ind (false,_)) as ref)::_) ->
957 let _, _, itl, _, _ = E.get_checked_indtys ref in
958 Some (uri,List.length itl)
959 | C.Prod (n,so,de) ->
960 returns_a_coinductive ~subst ((n,C.Decl so)::context) de
963 and type_of_constant ((Ref.Ref (_,uri,_)) as ref) =
964 match E.get_checked_obj uri, ref with
965 | (_,_,_,_,C.Inductive (_,_,tl,_)), Ref.Ref (_,_,Ref.Ind (_,i)) ->
966 let _,_,arity,_ = List.nth tl i in arity
967 | (_,_,_,_,C.Inductive (_,_,tl,_)), Ref.Ref (_,_,Ref.Con (i,j)) ->
968 let _,_,_,cl = List.nth tl i in
969 let _,_,arity = List.nth cl (j-1) in
971 | (_,_,_,_,C.Fixpoint (_,fl,_)), Ref.Ref (_,_,(Ref.Fix (i,_)|Ref.CoFix i)) ->
972 let _,_,_,arity,_ = List.nth fl i in
974 | (_,_,_,_,C.Constant (_,_,_,ty,_)), Ref.Ref (_,_,(Ref.Def |Ref.Decl)) -> ty
975 | _ -> raise (AssertFailure (lazy "type_of_constant: environment/reference"))
978 let typecheck_context ~metasenv ~subst context =
984 _,C.Decl t -> ignore (typeof ~metasenv ~subst:[] context t)
985 | name,C.Def (te,ty) ->
986 ignore (typeof ~metasenv ~subst:[] context ty);
987 let ty' = typeof ~metasenv ~subst:[] context te in
988 if not (R.are_convertible ~subst context ty' ty) then
989 raise (AssertFailure (lazy (Printf.sprintf (
990 "the type of the definiens for %s in the context is not "^^
991 "convertible with the declared one.\n"^^
992 "inferred type:\n%s\nexpected type:\n%s")
994 (PP.ppterm ~subst ~metasenv ~context ty')
995 (PP.ppterm ~subst ~metasenv ~context ty))))
1001 let typecheck_metasenv metasenv =
1004 (fun metasenv (i,(_,context,ty) as conj) ->
1005 if List.mem_assoc i metasenv then
1006 raise (TypeCheckerFailure (lazy ("duplicate meta " ^ string_of_int i ^
1008 typecheck_context ~metasenv ~subst:[] context;
1009 ignore (typeof ~metasenv ~subst:[] context ty);
1014 let typecheck_subst ~metasenv subst =
1017 (fun subst (i,(_,context,ty,bo) as conj) ->
1018 if List.mem_assoc i subst then
1019 raise (AssertFailure (lazy ("duplicate meta " ^ string_of_int i ^
1020 " in substitution")));
1021 if List.mem_assoc i metasenv then
1022 raise (AssertFailure (lazy ("meta " ^ string_of_int i ^
1023 " is both in the metasenv and in the substitution")));
1024 typecheck_context ~metasenv ~subst context;
1025 ignore (typeof ~metasenv ~subst context ty);
1026 let ty' = typeof ~metasenv ~subst context bo in
1027 if not (R.are_convertible ~subst context ty' ty) then
1028 raise (AssertFailure (lazy (Printf.sprintf (
1029 "the type of the definiens for %d in the substitution is not "^^
1030 "convertible with the declared one.\n"^^
1031 "inferred type:\n%s\nexpected type:\n%s")
1033 (PP.ppterm ~subst ~metasenv ~context ty')
1034 (PP.ppterm ~subst ~metasenv ~context ty))));
1039 let typecheck_obj (uri,height,metasenv,subst,kind) =
1040 typecheck_metasenv metasenv;
1041 typecheck_subst ~metasenv subst;
1043 | C.Constant (_,_,Some te,ty,_) ->
1044 let _ = typeof ~subst ~metasenv [] ty in
1045 let ty_te = typeof ~subst ~metasenv [] te in
1046 if not (R.are_convertible ~subst [] ty_te ty) then
1047 raise (TypeCheckerFailure (lazy (Printf.sprintf (
1048 "the type of the body is not convertible with the declared one.\n"^^
1049 "inferred type:\n%s\nexpected type:\n%s")
1050 (PP.ppterm ~subst ~metasenv ~context:[] ty_te)
1051 (PP.ppterm ~subst ~metasenv ~context:[] ty))))
1052 | C.Constant (_,_,None,ty,_) -> ignore (typeof ~subst ~metasenv [] ty)
1053 | C.Inductive (is_ind, leftno, tyl, _) ->
1054 check_mutual_inductive_defs uri ~metasenv ~subst is_ind leftno tyl
1055 | C.Fixpoint (inductive,fl,_) ->
1058 (fun (types,kl) (_,name,k,ty,_) ->
1059 let _ = typeof ~subst ~metasenv [] ty in
1060 ((name,C.Decl ty)::types, k::kl)
1063 let len = List.length types in
1065 List.split (List.map2
1066 (fun (_,_,_,_,bo) rno ->
1067 let dbo = debruijn uri len [] bo in
1071 List.iter2 (fun (_,name,x,ty,_) bo ->
1072 let ty_bo = typeof ~subst ~metasenv types bo in
1073 if not (R.are_convertible ~subst types ty_bo ty)
1074 then raise (TypeCheckerFailure (lazy ("(Co)Fix: ill-typed bodies")))
1076 if inductive then begin
1077 let m, context = eat_lambdas ~subst ~metasenv types (x + 1) bo in
1080 match List.hd context with _,C.Decl t -> t | _ -> assert false
1082 match R.whd ~subst (List.tl context) he with
1083 | C.Const (Ref.Ref (_,uri,Ref.Ind _) as ref)
1084 | C.Appl (C.Const (Ref.Ref (_,uri,Ref.Ind _) as ref) :: _) ->
1085 let _,_,itl,_,_ = E.get_checked_indtys ref in
1086 uri, List.length itl
1089 (* guarded by destructors conditions D{f,k,x,M} *)
1090 let rec enum_from k =
1091 function [] -> [] | v::tl -> (k,v)::enum_from (k+1) tl
1093 guarded_by_destructors r_uri r_len
1094 ~subst ~metasenv context (enum_from (x+2) kl) m
1096 match returns_a_coinductive ~subst [] ty with
1098 raise (TypeCheckerFailure
1099 (lazy "CoFix: does not return a coinductive type"))
1100 | Some (r_uri, r_len) ->
1101 (* guarded by constructors conditions C{f,M} *)
1103 (guarded_by_constructors ~subst ~metasenv types bo r_uri r_len len)
1105 raise (TypeCheckerFailure
1106 (lazy "CoFix: not guarded by constructors"))
1112 let trust = ref (fun _ -> false);;
1113 let set_trust f = trust := f
1114 let trust_obj obj = !trust obj
1117 (* web interface stuff *)
1120 ref (function (`Start_type_checking _|`Type_checking_completed _|`Type_checking_interrupted _|`Type_checking_failed _|`Trust_obj _) -> ())
1123 let set_logger f = logger := f;;
1125 let typecheck_obj obj =
1126 let u,_,_,_,_ = obj in
1128 !logger (`Start_type_checking u);
1130 !logger (`Type_checking_completed u)
1133 !logger (`Type_checking_interrupted u);
1136 !logger (`Type_checking_failed u);
1142 if trust_obj obj then
1143 let u,_,_,_,_ = obj in
1144 !logger (`Trust_obj u)