X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fcomponents%2Fng_kernel%2FnCicTypeChecker.ml;h=c19561d355821bfffa6fa7fceffeb11ef0a299cd;hb=498898aa5d4525d979fe5564c180ab75f6483c99;hp=33d3e86cfad7d693d8b372b990d0fc243b8f1cc3;hpb=32522cf70b6bc38f0c3cc5d25b9bd1a93f05862f;p=helm.git diff --git a/helm/software/components/ng_kernel/nCicTypeChecker.ml b/helm/software/components/ng_kernel/nCicTypeChecker.ml index 33d3e86cf..c19561d35 100644 --- a/helm/software/components/ng_kernel/nCicTypeChecker.ml +++ b/helm/software/components/ng_kernel/nCicTypeChecker.ml @@ -9,11 +9,11 @@ \ / This software is distributed as is, NO WARRANTY. V_______________________________________________________________ *) -(* $Id: nCicReduction.ml 8250 2008-03-25 17:56:20Z tassi $ *) +(* $Id$ *) module C = NCic -module R = NCicReduction module Ref = NReference +module R = NCicReduction module S = NCicSubstitution module U = NCicUtils module E = NCicEnvironment @@ -22,6 +22,13 @@ module PP = NCicPp exception TypeCheckerFailure of string Lazy.t exception AssertFailure of string Lazy.t +(* +let raise = function + | TypeCheckerFailure s as e -> prerr_endline (Lazy.force s); raise e + | e -> raise e +;; +*) + type recf_entry = | Evil of int (* rno *) | UnfFix of bool list (* fixed arguments *) @@ -52,6 +59,7 @@ let get_fixed_args i l = let shift_k e (c,rf,x) = e::c,List.map (fun (k,v) -> k+1,v) rf,x+1;; +(* for debugging only let string_of_recfuns ~subst ~metasenv ~context l = let pp = PP.ppterm ~subst ~metasenv ~context in let safe, rest = List.partition (function (_,Safe) -> true | _ -> false) l in @@ -67,6 +75,7 @@ let string_of_recfuns ~subst ~metasenv ~context l = (function (i,Evil rno)->pp(C.Rel i)^"/"^string_of_int rno | _ -> assert false) dang) ;; +*) let fixed_args bos j n nn = let rec aux k acc = function @@ -75,7 +84,7 @@ let fixed_args bos j n nn = match l1,l2 with [],[] -> [] | he1::tl1, he2::tl2 -> (he1,he2)::combine tl1 tl2 - | he::tl, [] -> (false,C.Rel ~-1)::combine tl [] (* dummy term *) + | _::tl, [] -> (false,C.Rel ~-1)::combine tl [] (* dummy term *) | [],_::_ -> assert false in let lefts, _ = HExtlib.split_nth (min j (List.length args)) args in @@ -87,96 +96,51 @@ let fixed_args bos j n nn = (let rec f = function 0 -> [] | n -> true :: f (n-1) in f j) bos ;; -let rec list_iter_default2 f l1 def l2 = - match l1,l2 with - | [], _ -> () - | a::ta, b::tb -> f a b; list_iter_default2 f ta def tb - | a::ta, [] -> f a def; list_iter_default2 f ta def [] -;; - -let rec split_prods ~subst context n te = - match (n, R.whd ~subst context te) with - | (0, _) -> context,te - | (n, C.Prod (name,so,ta)) when n > 0 -> - split_prods ~subst ((name,(C.Decl so))::context) (n - 1) ta - | (_, _) -> raise (AssertFailure (lazy "split_prods")) -;; - -let debruijn ?(cb=fun _ _ -> ()) uri number_of_types context = +let debruijn uri number_of_types ~subst context = +(* manca la subst! *) let rec aux k t = - let res = - match t with - | C.Meta (i,(s,C.Ctx l)) -> - let l1 = U.sharing_map (aux (k-s)) l in - if l1 == l then t else C.Meta (i,(s,C.Ctx l1)) - | C.Meta _ -> t - | C.Const (Ref.Ref (_,uri1,(Ref.Fix (no,_) | Ref.CoFix no))) - | C.Const (Ref.Ref (_,uri1,Ref.Ind no)) when NUri.eq uri uri1 -> - C.Rel (k + number_of_types - no) - | t -> U.map (fun _ k -> k+1) k aux t - in - cb t res; res + match t with + | C.Meta (i,(s,l)) -> + (try + let _,_,term,_ = U.lookup_subst i subst in + let ts = S.subst_meta (0,l) term in + let ts' = aux (k-s) ts in + if ts == ts' then t else ts' + with U.Subst_not_found _ -> + match l with + C.Ctx l -> + let l1 = HExtlib.sharing_map (aux (k-s)) l in + if l1 == l then t else C.Meta (i,(s,C.Ctx l1)) + | _ -> t) + | C.Const (Ref.Ref (uri1,(Ref.Fix (no,_,_) | Ref.CoFix no))) + | C.Const (Ref.Ref (uri1,Ref.Ind (_,no,_))) when NUri.eq uri uri1 -> + C.Rel (k + number_of_types - no) + | t -> U.map (fun _ k -> k+1) k aux t in aux (List.length context) ;; -let sort_of_prod ~metasenv ~subst context (name,s) (t1, t2) = +let sort_of_prod ~metasenv ~subst context (name,s) t (t1, t2) = let t1 = R.whd ~subst context t1 in let t2 = R.whd ~subst ((name,C.Decl s)::context) t2 in match t1, t2 with - | C.Sort s1, C.Sort C.Prop -> t2 - | C.Sort (C.Type u1), C.Sort (C.Type u2) -> C.Sort (C.Type (max u1 u2)) - | C.Sort _,C.Sort (C.Type _) -> t2 - | C.Sort (C.Type _) , C.Sort C.CProp -> t1 - | C.Sort _, C.Sort C.CProp -> t2 - | C.Meta _, C.Sort _ - | C.Meta _, C.Meta _ - | C.Sort _, C.Meta _ when U.is_closed t2 -> t2 - | _ -> + | C.Sort _, C.Sort C.Prop -> t2 + | C.Sort (C.Type u1), C.Sort (C.Type u2) -> + C.Sort (C.Type (NCicEnvironment.max u1 u2)) + | C.Sort C.Prop,C.Sort (C.Type _) -> t2 + | C.Meta (_,(_,(C.Irl 0 | C.Ctx []))), C.Sort _ -> t2 + | C.Meta (_,(_,(C.Irl 0 | C.Ctx []))), C.Meta (i,(_,(C.Irl 0 | C.Ctx []))) + | C.Sort _, C.Meta (i,(_,(C.Irl 0 | C.Ctx []))) -> + NCic.Meta (i,(0, C.Irl 0)) + | x, (C.Sort _ | C.Meta (_,(_,(C.Irl 0 | C.Ctx [])))) + | _, x -> + let y, context = + if x == t1 then s, context else t, ((name,C.Decl s)::context) + in raise (TypeCheckerFailure (lazy (Printf.sprintf - "Prod: expected two sorts, found = %s, %s" - (PP.ppterm ~subst ~metasenv ~context t1) - (PP.ppterm ~subst ~metasenv ~context t2)))) -;; - -let eat_prods ~subst ~metasenv context he ty_he args_with_ty = - let rec aux ty_he = function - | [] -> ty_he - | (arg, ty_arg)::tl -> - match R.whd ~subst context ty_he with - | C.Prod (n,s,t) -> -(* - prerr_endline (PP.ppterm ~subst ~metasenv ~context s ^ " - Vs - " - ^ PP.ppterm ~subst ~metasenv ~context ty_arg); - prerr_endline (PP.ppterm ~subst ~metasenv ~context - (S.subst ~avoid_beta_redexes:true arg t)); -*) - if R.are_convertible ~subst ~metasenv context ty_arg s then - aux (S.subst ~avoid_beta_redexes:true arg t) tl - else - raise - (TypeCheckerFailure - (lazy (Printf.sprintf - ("Appl: wrong application of %s: the parameter %s has type"^^ - "\n%s\nbut it should have type \n%s\nContext:\n%s\n") - (PP.ppterm ~subst ~metasenv ~context he) - (PP.ppterm ~subst ~metasenv ~context arg) - (PP.ppterm ~subst ~metasenv ~context ty_arg) - (PP.ppterm ~subst ~metasenv ~context s) - (PP.ppcontext ~subst ~metasenv context)))) - | _ -> - raise - (TypeCheckerFailure - (lazy (Printf.sprintf - "Appl: %s is not a function, it cannot be applied" - (PP.ppterm ~subst ~metasenv ~context - (let res = List.length tl in - let eaten = List.length args_with_ty - res in - (C.Appl - (he::List.map fst - (fst (HExtlib.split_nth eaten args_with_ty))))))))) - in - aux ty_he args_with_ty + "%s is expected to be a type, but its type is %s that is not a sort" + (PP.ppterm ~subst ~metasenv ~context y) + (PP.ppterm ~subst ~metasenv ~context x)))) ;; (* instantiate_parameters ps (x1:T1)...(xn:Tn)C *) @@ -185,15 +149,15 @@ let rec instantiate_parameters params c = match c, params with | c,[] -> c | C.Prod (_,_,ta), he::tl -> instantiate_parameters tl (S.subst he ta) - | t,l -> raise (AssertFailure (lazy "1")) + | _,_ -> raise (AssertFailure (lazy "1")) ;; let specialize_inductive_type_constrs ~subst context ty_term = match R.whd ~subst context ty_term with - | C.Const (Ref.Ref (_,uri,Ref.Ind i) as ref) - | C.Appl (C.Const (Ref.Ref (_,uri,Ref.Ind i) as ref) :: _ ) as ty -> + | C.Const (Ref.Ref (_,Ref.Ind _) as ref) + | C.Appl (C.Const (Ref.Ref (_,Ref.Ind _) as ref) :: _ ) as ty -> let args = match ty with C.Appl (_::tl) -> tl | _ -> [] in - let is_ind, leftno, itl, attrs, i = E.get_checked_indtys ref in + let _, leftno, itl, _, i = E.get_checked_indtys ref in let left_args,_ = HExtlib.split_nth leftno args in let _,_,_,cl = List.nth itl i in List.map @@ -206,83 +170,145 @@ let specialize_and_abstract_constrs ~subst r_uri r_len context ty_term = let len = List.length context in let context_dcl = match E.get_checked_obj r_uri with - | _,_,_,_, NCic.Inductive (_,_,tys,_) -> + | _,_,_,_, C.Inductive (_,_,tys,_) -> context @ List.map (fun (_,name,arity,_) -> name,C.Decl arity) tys | _ -> assert false in context_dcl, - List.map (fun (_,id,ty) -> id, debruijn r_uri r_len context ty) cl, + List.map (fun (_,id,ty) -> id, debruijn r_uri r_len ~subst context ty) cl, len, len + r_len ;; exception DoesOccur;; let does_not_occur ~subst context n nn t = - let rec aux (context,n,nn as k) _ = function - | C.Rel m when m > n && m <= nn -> raise DoesOccur + let rec aux k _ = function + | C.Rel m when m > n+k && m <= nn+k -> raise DoesOccur + | C.Rel m when m <= k || m > nn+k -> () | C.Rel m -> - (try (match List.nth context (m-1) with - | _,C.Def (bo,_) -> aux k () (S.lift m bo) - | _ -> ()) + (try match List.nth context (m-1-k) with + | _,C.Def (bo,_) -> aux (n-m) () bo + | _ -> () with Failure _ -> assert false) | C.Meta (_,(_,(C.Irl 0 | C.Ctx []))) -> (* closed meta *) () | C.Meta (mno,(s,l)) -> (try - let _,_,term,_ = U.lookup_subst mno subst in - aux (context,n+s,nn+s) () (S.subst_meta (0,l) term) - with CicUtil.Subst_not_found _ -> match l with - | C.Irl len -> if not (n >= s+len || s > nn) then raise DoesOccur - | C.Ctx lc -> List.iter (aux (context,n+s,nn+s) ()) lc) - | t -> U.fold (fun e (ctx,n,nn) -> (e::ctx,n+1,nn+1)) k aux () t + (* possible optimization here: try does_not_occur on l and + perform substitution only if DoesOccur is raised *) + let _,_,term,_ = U.lookup_subst mno subst in + aux (k-s) () (S.subst_meta (0,l) term) + with U.Subst_not_found _ -> () (*match l with + | C.Irl len -> if not (n+k >= s+len || s > nn+k) then raise DoesOccur + | C.Ctx lc -> List.iter (aux (k-s) ()) lc*)) + | t -> U.fold (fun _ k -> k + 1) k aux () t in - try aux (context,n,nn) () t; true + try aux 0 () t; true with DoesOccur -> false ;; -(*CSC l'indice x dei tipi induttivi e' t.c. n < x <= nn *) -(*CSC questa funzione e' simile alla are_all_occurrences_positive, ma fa *) -(*CSC dei controlli leggermente diversi. Viene invocata solamente dalla *) -(*CSC strictly_positive *) -(*CSC definizione (giusta???) tratta dalla mail di Hugo ;-) *) -let rec weakly_positive ~subst context n nn uri te = -(*CSC: Che schifo! Bisogna capire meglio e trovare una soluzione ragionevole!*) - let dummy = C.Sort (C.Type ~-1) in - (*CSC: mettere in cicSubstitution *) +let rec eat_lambdas ~subst ~metasenv context n te = + match (n, R.whd ~subst context te) with + | (0, _) -> (te, context) + | (n, C.Lambda (name,so,ta)) when n > 0 -> + eat_lambdas ~subst ~metasenv ((name,(C.Decl so))::context) (n - 1) ta + | (n, te) -> + raise (AssertFailure (lazy (Printf.sprintf "eat_lambdas (%d, %s)" n + (PP.ppterm ~subst ~metasenv ~context te)))) +;; + +let rec eat_or_subst_lambdas + ~subst ~metasenv n te to_be_subst args (context,_,_ as k) += + match n, R.whd ~subst context te, to_be_subst, args with + | (n, C.Lambda (_,_,ta),true::to_be_subst,arg::args) when n > 0 -> + eat_or_subst_lambdas ~subst ~metasenv (n - 1) (S.subst arg ta) + to_be_subst args k + | (n, C.Lambda (name,so,ta),false::to_be_subst,_::args) when n > 0 -> + eat_or_subst_lambdas ~subst ~metasenv (n - 1) ta to_be_subst args + (shift_k (name,(C.Decl so)) k) + | (_, te, _, _) -> te, k +;; + +let check_homogeneous_call ~subst context indparamsno n uri reduct tl = + let last = + List.fold_left + (fun k x -> + if k = 0 then 0 + else + match R.whd ~subst context x with + | C.Rel m when m = n - (indparamsno - k) -> k - 1 + | _ -> raise (TypeCheckerFailure (lazy + ("Argument "^string_of_int (indparamsno - k + 1) ^ " (of " ^ + string_of_int indparamsno ^ " fixed) is not homogeneous in "^ + "appl:\n"^ PP.ppterm ~context ~subst ~metasenv:[] reduct)))) + indparamsno tl + in + if last <> 0 then + raise (TypeCheckerFailure + (lazy ("Non-positive occurence in mutual inductive definition(s) [2]"^ + NUri.string_of_uri uri))) +;; + +(* Inductive types being checked for positivity have *) +(* indexes x s.t. n < x <= nn. *) +let rec weakly_positive ~subst context n nn uri indparamsno posuri te = + (*CSC: Not very nice. *) + let dummy = C.Sort C.Prop in + (*CSC: to be moved in cicSubstitution? *) let rec subst_inductive_type_with_dummy _ = function - | C.Const (Ref.Ref (_,uri',Ref.Ind 0)) when NUri.eq uri' uri -> dummy - | C.Appl ((C.Const (Ref.Ref (_,uri',Ref.Ind 0)))::tl) - when NUri.eq uri' uri -> dummy + | C.Const (Ref.Ref (uri',Ref.Ind (true,0,_))) when NUri.eq uri' uri -> dummy + | C.Appl ((C.Const (Ref.Ref (uri',Ref.Ind (true,0,lno))))::tl) + when NUri.eq uri' uri -> + let _, rargs = HExtlib.split_nth lno tl in + if rargs = [] then dummy else C.Appl (dummy :: rargs) | t -> U.map (fun _ x->x) () subst_inductive_type_with_dummy t in - match R.whd context te with - | C.Const (Ref.Ref (_,uri',Ref.Ind _)) - | C.Appl ((C.Const (Ref.Ref (_,uri',Ref.Ind _)))::_) - when NUri.eq uri' uri -> true - | C.Prod (name,source,dest) when - does_not_occur ~subst ((name,C.Decl source)::context) 0 1 dest -> - (* dummy abstraction, so we behave as in the anonimous case *) - strictly_positive ~subst context n nn - (subst_inductive_type_with_dummy () source) && - weakly_positive ~subst ((name,C.Decl source)::context) - (n + 1) (nn + 1) uri dest - | C.Prod (name,source,dest) -> - does_not_occur ~subst context n nn - (subst_inductive_type_with_dummy () source)&& - weakly_positive ~subst ((name,C.Decl source)::context) - (n + 1) (nn + 1) uri dest - | _ -> - raise (TypeCheckerFailure (lazy "Malformed inductive constructor type")) + (* this function has the same semantics of are_all_occurrences_positive + but the i-th context entry role is played by dummy and some checks + are skipped because we already know that are_all_occurrences_positive + of uri in te. *) + let rec aux context n nn te = + match R.whd ~subst context te with + | t when t = dummy -> true + | C.Meta (i,lc) -> + (try + let _,_,term,_ = U.lookup_subst i subst in + let t = S.subst_meta lc term in + weakly_positive ~subst context n nn uri indparamsno posuri t + with U.Subst_not_found _ -> true) + | C.Appl (te::rargs) when te = dummy -> + List.for_all (does_not_occur ~subst context n nn) rargs + | C.Prod (name,source,dest) when + does_not_occur ~subst ((name,C.Decl source)::context) 0 1 dest -> + (* dummy abstraction, so we behave as in the anonimous case *) + strictly_positive ~subst context n nn indparamsno posuri source && + aux ((name,C.Decl source)::context) (n + 1) (nn + 1) dest + | C.Prod (name,source,dest) -> + does_not_occur ~subst context n nn source && + aux ((name,C.Decl source)::context) (n + 1) (nn + 1) dest + | _ -> + raise (TypeCheckerFailure (lazy "Malformed inductive constructor type")) + in + aux context n nn (subst_inductive_type_with_dummy () te) -and strictly_positive ~subst context n nn te = - match R.whd context te with +and strictly_positive ~subst context n nn indparamsno posuri te = + match R.whd ~subst context te with | t when does_not_occur ~subst context n nn t -> true - | C.Rel _ -> true + | C.Meta (i,lc) -> + (try + let _,_,term,_ = U.lookup_subst i subst in + let t = S.subst_meta lc term in + strictly_positive ~subst context n nn indparamsno posuri t + with U.Subst_not_found _ -> true) + | C.Rel _ when indparamsno = 0 -> true + | C.Appl ((C.Rel m)::tl) as reduct when m > n && m <= nn -> + check_homogeneous_call ~subst context indparamsno n posuri reduct tl; + List.for_all (does_not_occur ~subst context n nn) tl | C.Prod (name,so,ta) -> does_not_occur ~subst context n nn so && - strictly_positive ~subst ((name,C.Decl so)::context) (n+1) (nn+1) ta - | C.Appl ((C.Rel m)::tl) when m > n && m <= nn -> - List.for_all (does_not_occur ~subst context n nn) tl - | C.Appl (C.Const (Ref.Ref (_,uri,Ref.Ind i) as r)::tl) -> + strictly_positive ~subst ((name,C.Decl so)::context) (n+1) (nn+1) + indparamsno posuri ta + | C.Appl (C.Const (Ref.Ref (uri,Ref.Ind _) as r)::tl) -> let _,paramsno,tyl,_,i = E.get_checked_indtys r in let _,name,ity,cl = List.nth tyl i in let ok = List.length tyl = 1 in @@ -294,32 +320,16 @@ and strictly_positive ~subst context n nn te = ok && List.for_all (does_not_occur ~subst context n nn) arguments && List.for_all - (weakly_positive ~subst ((name,C.Decl ity)::context) (n+1) (nn+1) uri) cl + (weakly_positive ~subst ((name,C.Decl ity)::context) (n+1) (nn+1) + uri indparamsno posuri) cl | _ -> false (* the inductive type indexes are s.t. n < x <= nn *) and are_all_occurrences_positive ~subst context uri indparamsno i n nn te = - match R.whd context te with + match R.whd ~subst context te with | C.Appl ((C.Rel m)::tl) as reduct when m = i -> - let last = - List.fold_left - (fun k x -> - if k = 0 then 0 - else - match R.whd context x with - | C.Rel m when m = n - (indparamsno - k) -> k - 1 - | y -> raise (TypeCheckerFailure (lazy - ("Argument "^string_of_int (indparamsno - k + 1) ^ " (of " ^ - string_of_int indparamsno ^ " fixed) is not homogeneous in "^ - "appl:\n"^ PP.ppterm ~context ~subst ~metasenv:[] reduct)))) - indparamsno tl - in - if last = 0 then - List.for_all (does_not_occur ~subst context n nn) tl - else - raise (TypeCheckerFailure - (lazy ("Non-positive occurence in mutual inductive definition(s) [2]"^ - NUri.string_of_uri uri))) + check_homogeneous_call ~subst context indparamsno n uri reduct tl; + List.for_all (does_not_occur ~subst context n nn) tl | C.Rel m when m = i -> if indparamsno = 0 then true @@ -327,9 +337,9 @@ and are_all_occurrences_positive ~subst context uri indparamsno i n nn te = raise (TypeCheckerFailure (lazy ("Non-positive occurence in mutual inductive definition(s) [3]"^ NUri.string_of_uri uri))) - | C.Prod (name,source,dest) when + | C.Prod (name,source,dest) when does_not_occur ~subst ((name,C.Decl source)::context) 0 1 dest -> - strictly_positive ~subst context n nn source && + strictly_positive ~subst context n nn indparamsno uri source && are_all_occurrences_positive ~subst ((name,C.Decl source)::context) uri indparamsno (i+1) (n + 1) (nn + 1) dest @@ -347,6 +357,28 @@ and are_all_occurrences_positive ~subst context uri indparamsno i n nn te = exception NotGuarded of string Lazy.t;; +let type_of_branch ~subst context leftno outty cons tycons = + let rec aux liftno context cons tycons = + match R.whd ~subst context tycons with + | C.Const (Ref.Ref (_,Ref.Ind _)) -> C.Appl [S.lift liftno outty ; cons] + | C.Appl (C.Const (Ref.Ref (_,Ref.Ind _))::tl) -> + let _,arguments = HExtlib.split_nth leftno tl in + C.Appl (S.lift liftno outty::arguments@[cons]) + | C.Prod (name,so,de) -> + let cons = + match S.lift 1 cons with + | C.Appl l -> C.Appl (l@[C.Rel 1]) + | t -> C.Appl [t ; C.Rel 1] + in + C.Prod (name,so, aux (liftno+1) ((name,(C.Decl so))::context) cons de) + | t -> raise (AssertFailure + (lazy ("type_of_branch, the contructor has type: " ^ NCicPp.ppterm + ~metasenv:[] ~context:[] ~subst:[] t))) + in + aux 0 context cons tycons +;; + + let rec typeof ~subst ~metasenv context term = let rec typeof_aux context = fun t -> (*prerr_endline (PP.ppterm ~metasenv ~subst ~context t);*) @@ -356,19 +388,27 @@ let rec typeof ~subst ~metasenv context term = match List.nth context (n - 1) with | (_,C.Decl ty) -> S.lift n ty | (_,C.Def (_,ty)) -> S.lift n ty - with Failure _ -> raise (TypeCheckerFailure (lazy "unbound variable"))) - | C.Sort (C.Type i) -> C.Sort (C.Type (i+1)) - | C.Sort s -> C.Sort (C.Type 0) + with Failure _ -> + raise (TypeCheckerFailure (lazy ("unbound variable " ^ string_of_int n + ^" under: " ^ NCicPp.ppcontext ~metasenv ~subst context)))) + | C.Sort (C.Type [false,u]) -> C.Sort (C.Type [true, u]) + | C.Sort (C.Type _) -> + raise (AssertFailure (lazy ("Cannot type an inferred type: "^ + NCicPp.ppterm ~subst ~metasenv ~context t))) + | C.Sort _ -> C.Sort (C.Type NCicEnvironment.type0) | C.Implicit _ -> raise (AssertFailure (lazy "Implicit found")) | C.Meta (n,l) as t -> let canonical_ctx,ty = try let _,c,_,ty = U.lookup_subst n subst in c,ty with U.Subst_not_found _ -> try - let _,_,c,ty = U.lookup_meta n metasenv in c,ty + let _,c,ty = U.lookup_meta n metasenv in c, ty +(* match ty with C.Implicit _ -> assert false | _ -> c,ty *) with U.Meta_not_found _ -> raise (AssertFailure (lazy (Printf.sprintf - "%s not found" (PP.ppterm ~subst ~metasenv ~context t)))) + "%s not found in:\n%s" (PP.ppterm ~subst ~metasenv ~context t) + (PP.ppmetasenv ~subst metasenv) + ))) in check_metasenv_consistency t ~subst ~metasenv context canonical_ctx l; S.subst_meta l ty @@ -376,7 +416,7 @@ let rec typeof ~subst ~metasenv context term = | C.Prod (name,s,t) -> let sort1 = typeof_aux context s in let sort2 = typeof_aux ((name,(C.Decl s))::context) t in - sort_of_prod ~metasenv ~subst context (name,s) (sort1,sort2) + sort_of_prod ~metasenv ~subst context (name,s) t (sort1,sort2) | C.Lambda (n,s,t) -> let sort = typeof_aux context s in (match R.whd ~subst context sort with @@ -393,7 +433,7 @@ let rec typeof ~subst ~metasenv context term = | C.LetIn (n,ty,t,bo) -> let ty_t = typeof_aux context t in let _ = typeof_aux context ty in - if not (R.are_convertible ~subst ~metasenv context ty ty_t) then + if not (R.are_convertible ~metasenv ~subst context ty_t ty) then raise (TypeCheckerFailure (lazy (Printf.sprintf @@ -407,18 +447,11 @@ let rec typeof ~subst ~metasenv context term = | C.Appl (he::(_::_ as args)) -> let ty_he = typeof_aux context he in let args_with_ty = List.map (fun t -> t, typeof_aux context t) args in -(* - prerr_endline ("HEAD: " ^ PP.ppterm ~subst ~metasenv ~context ty_he); - prerr_endline ("TARGS: " ^ String.concat " | " (List.map (PP.ppterm - ~subst ~metasenv ~context) (List.map snd args_with_ty))); - prerr_endline ("ARGS: " ^ String.concat " | " (List.map (PP.ppterm - ~subst ~metasenv ~context) (List.map fst args_with_ty))); -*) eat_prods ~subst ~metasenv context he ty_he args_with_ty | C.Appl _ -> raise (AssertFailure (lazy "Appl of length < 2")) - | C.Match (Ref.Ref (_,_,Ref.Ind tyno) as r,outtype,term,pl) -> + | C.Match (Ref.Ref (_,Ref.Ind (_,tyno,_)) as r,outtype,term,pl) -> let outsort = typeof_aux context outtype in - let inductive,leftno,itl,_,_ = E.get_checked_indtys r in + let _,leftno,itl,_,_ = E.get_checked_indtys r in let constructorsno = let _,_,_,cl = List.nth itl tyno in List.length cl in @@ -426,8 +459,8 @@ let rec typeof ~subst ~metasenv context term = let ty = R.whd ~subst context (typeof_aux context term) in let r',tl = match ty with - C.Const (Ref.Ref (_,_,Ref.Ind _) as r') -> r',[] - | C.Appl (C.Const (Ref.Ref (_,_,Ref.Ind _) as r') :: tl) -> r',tl + C.Const (Ref.Ref (_,Ref.Ind _) as r') -> r',[] + | C.Appl (C.Const (Ref.Ref (_,Ref.Ind _) as r') :: tl) -> r',tl | _ -> raise (TypeCheckerFailure (lazy (Printf.sprintf @@ -469,9 +502,9 @@ let rec typeof ~subst ~metasenv context term = let ty_p = typeof_aux context p in let ty_cons = typeof_aux context cons in let ty_branch = - type_of_branch ~subst context leftno outtype cons ty_cons 0 + type_of_branch ~subst context leftno outtype cons ty_cons in - j+1, R.are_convertible ~subst ~metasenv context ty_p ty_branch, + j+1, R.are_convertible ~metasenv ~subst context ty_p ty_branch, ty_p, ty_branch else j,false,old_p_ty,old_exp_p_ty @@ -491,23 +524,6 @@ let rec typeof ~subst ~metasenv context term = R.head_beta_reduce (C.Appl res) | C.Match _ -> assert false - and type_of_branch ~subst context leftno outty cons tycons liftno = - match R.whd ~subst context tycons with - | C.Const (Ref.Ref (_,_,Ref.Ind _)) -> C.Appl [S.lift liftno outty ; cons] - | C.Appl (C.Const (Ref.Ref (_,_,Ref.Ind _))::tl) -> - let _,arguments = HExtlib.split_nth leftno tl in - C.Appl (S.lift liftno outty::arguments@[cons]) - | C.Prod (name,so,de) -> - let cons = - match S.lift 1 cons with - | C.Appl l -> C.Appl (l@[C.Rel 1]) - | t -> C.Appl [t ; C.Rel 1] - in - C.Prod (name,so, - type_of_branch ~subst ((name,(C.Decl so))::context) - leftno outty cons de (liftno+1)) - | _ -> raise (AssertFailure (lazy "type_of_branch")) - (* check_metasenv_consistency checks that the "canonical" context of a metavariable is consitent - up to relocation via the relocation list l - with the actual context *) @@ -522,7 +538,7 @@ let rec typeof ~subst ~metasenv context term = | 0,_,_::_ | _,_,[] -> raise (AssertFailure (lazy (Printf.sprintf - "Local and canonical context %s have different lengths" + "(2) Local and canonical context %s have different lengths" (PP.ppterm ~subst ~context ~metasenv term)))) | m,[],_::_ -> raise (TypeCheckerFailure (lazy (Printf.sprintf @@ -533,7 +549,7 @@ let rec typeof ~subst ~metasenv context term = (_,C.Decl t1), (_,C.Decl t2) | (_,C.Def (t1,_)), (_,C.Def (t2,_)) | (_,C.Def (_,t1)), (_,C.Decl t2) -> - if not (R.are_convertible ~subst ~metasenv tl t1 t2) then + if not (R.are_convertible ~metasenv ~subst tl t1 t2) then raise (TypeCheckerFailure (lazy (Printf.sprintf @@ -584,7 +600,7 @@ let rec typeof ~subst ~metasenv context term = with Failure _ -> t) | _ -> t in - if not (R.are_convertible ~subst ~metasenv context optimized_t ct) + if not (R.are_convertible ~metasenv ~subst context optimized_t ct) then raise (TypeCheckerFailure @@ -595,7 +611,7 @@ let rec typeof ~subst ~metasenv context term = (PP.ppterm ~subst ~metasenv ~context t)))) | t, (_,C.Decl ct) -> let type_t = typeof_aux context t in - if not (R.are_convertible ~subst ~metasenv context type_t ct) then + if not (R.are_convertible ~metasenv ~subst context type_t ct) then raise (TypeCheckerFailure (lazy (Printf.sprintf ("Not well typed metavariable local context: "^^ @@ -605,120 +621,223 @@ let rec typeof ~subst ~metasenv context term = (PP.ppterm ~subst ~metasenv ~context type_t)))) ) l lifted_canonical_context with - Invalid_argument _ -> + | Invalid_argument "List.iter2" -> raise (AssertFailure (lazy (Printf.sprintf - "Local and canonical context %s have different lengths" + "(1) Local and canonical context %s have different lengths" (PP.ppterm ~subst ~metasenv ~context term)))) - and is_non_informative context paramsno c = - let rec aux context c = - match R.whd context c with - | C.Prod (n,so,de) -> - let s = typeof_aux context so in - s = C.Sort C.Prop && aux ((n,(C.Decl so))::context) de - | _ -> true in - let context',dx = split_prods ~subst:[] context paramsno c in - aux context' dx - - and check_allowed_sort_elimination ~subst ~metasenv r = - let mkapp he arg = - match he with - | C.Appl l -> C.Appl (l @ [arg]) - | t -> C.Appl [t;arg] in - let rec aux context ind arity1 arity2 = - let arity1 = R.whd ~subst context arity1 in - let arity2 = R.whd ~subst context arity2 in - match arity1,arity2 with - | C.Prod (name,so1,de1), C.Prod (_,so2,de2) -> - if not (R.are_convertible ~subst ~metasenv context so1 so2) then - raise (TypeCheckerFailure (lazy (Printf.sprintf - "In outtype: expected %s, found %s" - (PP.ppterm ~subst ~metasenv ~context so1) - (PP.ppterm ~subst ~metasenv ~context so2) - ))); - aux ((name, C.Decl so1)::context) - (mkapp (S.lift 1 ind) (C.Rel 1)) de1 de2 - | C.Sort _, C.Prod (name,so,ta) -> - if not (R.are_convertible ~subst ~metasenv context so ind) then - raise (TypeCheckerFailure (lazy (Printf.sprintf - "In outtype: expected %s, found %s" - (PP.ppterm ~subst ~metasenv ~context ind) - (PP.ppterm ~subst ~metasenv ~context so) - ))); - (match arity1,ta with - | (C.Sort (C.CProp | C.Type _), C.Sort _) - | (C.Sort C.Prop, C.Sort C.Prop) -> () - | (C.Sort C.Prop, C.Sort (C.CProp | C.Type _)) -> - (* TODO: we should pass all these parameters since we - * have them already *) - let inductive,leftno,itl,_,i = E.get_checked_indtys r in - let itl_len = List.length itl in - let _,name,ty,cl = List.nth itl i in - let cl_len = List.length cl in - (* is it a singleton or empty non recursive and non informative - definition? *) - if not - (cl_len = 0 || - (itl_len = 1 && cl_len = 1 && - is_non_informative [name,C.Decl ty] leftno - (let _,_,x = List.nth cl 0 in x))) - then - raise (TypeCheckerFailure (lazy - ("Sort elimination not allowed"))); - | _,_ -> ()) - | _,_ -> () - in - aux - in typeof_aux context term -and check_mutual_inductive_defs uri ~metasenv ~subst is_ind leftno tyl = +and check_allowed_sort_elimination ~subst ~metasenv r = + let mkapp he arg = + match he with + | C.Appl l -> C.Appl (l @ [arg]) + | t -> C.Appl [t;arg] in + let rec aux context ind arity1 arity2 = + let arity1 = R.whd ~subst context arity1 in + let arity2 = R.whd ~subst context arity2 in + match arity1,arity2 with + | C.Prod (name,so1,de1), C.Prod (_,so2,de2) -> + if not (R.are_convertible ~metasenv ~subst context so1 so2) then + raise (TypeCheckerFailure (lazy (Printf.sprintf + "In outtype: expected %s, found %s" + (PP.ppterm ~subst ~metasenv ~context so1) + (PP.ppterm ~subst ~metasenv ~context so2) + ))); + aux ((name, C.Decl so1)::context) + (mkapp (S.lift 1 ind) (C.Rel 1)) de1 de2 + | C.Sort _, C.Prod (name,so,ta) -> + if not (R.are_convertible ~metasenv ~subst context so ind) then + raise (TypeCheckerFailure (lazy (Printf.sprintf + "In outtype: expected %s, found %s" + (PP.ppterm ~subst ~metasenv ~context ind) + (PP.ppterm ~subst ~metasenv ~context so) + ))); + (match arity1, R.whd ~subst ((name,C.Decl so)::context) ta with + | (C.Sort C.Type _, C.Sort _) + | (C.Sort C.Prop, C.Sort C.Prop) -> () + | (C.Sort C.Prop, C.Sort C.Type _) -> + (* TODO: we should pass all these parameters since we + * have them already *) + let _,leftno,itl,_,i = E.get_checked_indtys r in + let itl_len = List.length itl in + let _,itname,ittype,cl = List.nth itl i in + let cl_len = List.length cl in + (* is it a singleton, non recursive and non informative + definition or an empty one? *) + if not + (cl_len = 0 || + (itl_len = 1 && cl_len = 1 && + let _,_,constrty = List.hd cl in + is_non_recursive_singleton + ~subst r itname ittype constrty && + is_non_informative ~metasenv ~subst leftno constrty)) + then + raise (TypeCheckerFailure (lazy + ("Sort elimination not allowed"))); + | _,_ -> ()) + | _,_ -> () + in + aux + +and eat_prods ~subst ~metasenv context he ty_he args_with_ty = + let rec aux ty_he = function + | [] -> ty_he + | (arg, ty_arg)::tl -> + match R.whd ~subst context ty_he with + | C.Prod (_,s,t) -> + if R.are_convertible ~metasenv ~subst context ty_arg s then + aux (S.subst ~avoid_beta_redexes:true arg t) tl + else + raise + (TypeCheckerFailure + (lazy (Printf.sprintf + ("Appl: wrong application of %s: the argument %s has type"^^ + "\n%s\nbut it should have type \n%s\nContext:\n%s\n") + (PP.ppterm ~subst ~metasenv ~context he) + (PP.ppterm ~subst ~metasenv ~context arg) + (PP.ppterm ~subst ~metasenv ~context ty_arg) + (PP.ppterm ~subst ~metasenv ~context s) + (PP.ppcontext ~subst ~metasenv context)))) + | _ -> + raise + (TypeCheckerFailure + (lazy (Printf.sprintf + "Appl: %s is not a function, it cannot be applied" + (PP.ppterm ~subst ~metasenv ~context + (let res = List.length tl in + let eaten = List.length args_with_ty - res in + (C.Appl + (he::List.map fst + (fst (HExtlib.split_nth eaten args_with_ty))))))))) + in + aux ty_he args_with_ty + +and is_non_recursive_singleton ~subst (Ref.Ref (uri,_)) iname ity cty = + let ctx = [iname, C.Decl ity] in + let cty = debruijn uri 1 [] ~subst cty in + let len = List.length ctx in + let rec aux ctx n nn t = + match R.whd ~subst ctx t with + | C.Prod (name, src, tgt) -> + does_not_occur ~subst ctx n nn src && + aux ((name, C.Decl src) :: ctx) (n+1) (nn+1) tgt + | C.Rel k | C.Appl (C.Rel k :: _) when k = nn -> true + | _ -> assert false + in + aux ctx (len-1) len cty + +and is_non_informative ~metasenv ~subst paramsno c = + let rec aux context c = + match R.whd ~subst context c with + | C.Prod (n,so,de) -> + let s = typeof ~metasenv ~subst context so in + s = C.Sort C.Prop && aux ((n,(C.Decl so))::context) de + | _ -> true in + let context',dx = NCicReduction.split_prods ~subst [] paramsno c in + aux context' dx + +and check_mutual_inductive_defs uri ~metasenv ~subst leftno tyl = (* let's check if the arity of the inductive types are well formed *) List.iter (fun (_,_,x,_) -> ignore (typeof ~subst ~metasenv [] x)) tyl; (* let's check if the types of the inductive constructors are well formed. *) let len = List.length tyl in - let tys = List.rev (List.map (fun (_,n,ty,_) -> (n,(C.Decl ty))) tyl) in + let tys = List.rev_map (fun (_,n,ty,_) -> (n,(C.Decl ty))) tyl in ignore (List.fold_right - (fun (_,_,_,cl) i -> + (fun (it_relev,_,ty,cl) i -> + let context,ty_sort = NCicReduction.split_prods ~subst [] ~-1 ty in + let sx_context_ty_rev,_ = HExtlib.split_nth leftno (List.rev context) in List.iter - (fun (_,name,te) -> - let debruijnedte = debruijn uri len [] te in - ignore (typeof ~subst ~metasenv tys debruijnedte); + (fun (k_relev,_,te) -> + let k_relev = + try snd (HExtlib.split_nth leftno k_relev) + with Failure _ -> k_relev in + let te = debruijn uri len [] ~subst te in + let context,te = NCicReduction.split_prods ~subst tys leftno te in + let _,chopped_context_rev = + HExtlib.split_nth (List.length tys) (List.rev context) in + let sx_context_te_rev,_ = + HExtlib.split_nth leftno chopped_context_rev in + (try + ignore (List.fold_left2 + (fun context item1 item2 -> + let convertible = + match item1,item2 with + (_,C.Decl ty1),(_,C.Decl ty2) -> + R.are_convertible ~metasenv ~subst context ty1 ty2 + | (_,C.Def (bo1,ty1)),(_,C.Def (bo2,ty2)) -> + R.are_convertible ~metasenv ~subst context ty1 ty2 && + R.are_convertible ~metasenv ~subst context bo1 bo2 + | _,_ -> false + in + if not convertible then + raise (TypeCheckerFailure (lazy + ("Mismatch between the left parameters of the constructor " ^ + "and those of its inductive type"))) + else + item1::context + ) [] sx_context_ty_rev sx_context_te_rev) + with Invalid_argument "List.fold_left2" -> assert false); + let con_sort = typeof ~subst ~metasenv context te in + (match R.whd ~subst context con_sort, R.whd ~subst [] ty_sort with + (C.Sort (C.Type u1) as s1), (C.Sort (C.Type u2) as s2) -> + if not (E.universe_leq u1 u2) then + raise + (TypeCheckerFailure + (lazy ("The type " ^ PP.ppterm ~metasenv ~subst ~context s1^ + " of the constructor is not included in the inductive" ^ + " type sort " ^ PP.ppterm ~metasenv ~subst ~context s2))) + | C.Sort _, C.Sort C.Prop + | C.Sort _, C.Sort C.Type _ -> () + | _, _ -> + raise + (TypeCheckerFailure + (lazy ("Wrong constructor or inductive arity shape")))); (* let's check also the positivity conditions *) if not - (are_all_occurrences_positive ~subst tys uri leftno i 0 len - debruijnedte) + (are_all_occurrences_positive ~subst context uri leftno + (i+leftno) leftno (len+leftno) te) then raise (TypeCheckerFailure - (lazy ("Non positive occurence in "^NUri.string_of_uri uri)))) + (lazy ("Non positive occurence in "^NUri.string_of_uri + uri))) + else check_relevance ~subst ~metasenv context k_relev te) cl; - i + 1) + check_relevance ~subst ~metasenv [] it_relev ty; + i+1) tyl 1) -and eat_lambdas ~subst ~metasenv context n te = - match (n, R.whd ~subst context te) with - | (0, _) -> (te, context) - | (n, C.Lambda (name,so,ta)) when n > 0 -> - eat_lambdas ~subst ~metasenv ((name,(C.Decl so))::context) (n - 1) ta - | (n, te) -> - raise (AssertFailure (lazy (Printf.sprintf "eat_lambdas (%d, %s)" n - (PP.ppterm ~subst ~metasenv ~context te)))) - -and eat_or_subst_lambdas ~subst ~metasenv n te to_be_subst args - (context, recfuns, x as k) -= - match n, R.whd ~subst context te, to_be_subst, args with - | (n, C.Lambda (name,so,ta),true::to_be_subst,arg::args) when n > 0 -> - eat_or_subst_lambdas ~subst ~metasenv (n - 1) (S.subst arg ta) - to_be_subst args k - | (n, C.Lambda (name,so,ta),false::to_be_subst,arg::args) when n > 0 -> - eat_or_subst_lambdas ~subst ~metasenv (n - 1) ta to_be_subst args - (shift_k (name,(C.Decl so)) k) - | (_, te, _, _) -> te, k +and check_relevance ~subst ~metasenv context relevance ty = + let error context ty = + raise (TypeCheckerFailure + (lazy ("Wrong relevance declaration: " ^ + String.concat "," (List.map string_of_bool relevance)^ + "\nfor type: "^PP.ppterm ~metasenv ~subst ~context ty))) + in + let rec aux context relevance ty = + match R.whd ~subst context ty with + | C.Prod (name,so,de) -> + let sort = typeof ~subst ~metasenv context so in + (match (relevance,R.whd ~subst context sort) with + | [],_ -> () + | false::tl,C.Sort C.Prop -> aux ((name,(C.Decl so))::context) tl de + | true::_,C.Sort C.Prop + | false::_,C.Sort _ + | false::_,C.Meta _ -> error context ty + | true::tl,C.Sort _ + | true::tl,C.Meta _ -> aux ((name,(C.Decl so))::context) tl de + | _ -> raise (AssertFailure (lazy (Printf.sprintf + "Prod: the type %s of the source of %s is not a sort" + (PP.ppterm ~subst ~metasenv ~context sort) + (PP.ppterm ~subst ~metasenv ~context so))))) + | _ -> (match relevance with + | [] -> () + | _::_ -> error context ty) + in aux context relevance ty and guarded_by_destructors r_uri r_len ~subst ~metasenv context recfuns t = let recursor f k t = U.fold shift_k k (fun k () -> f k) () t in @@ -751,13 +870,14 @@ and guarded_by_destructors r_uri r_len ~subst ~metasenv context recfuns t = List.iter (aux k) tl | C.Appl ((C.Rel m)::tl) when is_unfolded m recfuns -> let fixed_args = get_fixed_args m recfuns in - list_iter_default2 (fun x b -> if not b then aux k x) tl false fixed_args + HExtlib.list_iter_default2 + (fun x b -> if not b then aux k x) tl false fixed_args | C.Rel m -> (match List.nth context (m-1) with | _,C.Decl _ -> () | _,C.Def (bo,_) -> aux k (S.lift m bo)) | C.Meta _ -> () - | C.Appl (C.Const ((Ref.Ref (_,uri,Ref.Fix (i,recno))) as r)::args) -> + | C.Appl (C.Const ((Ref.Ref (uri,Ref.Fix (i,recno,_))) as r)::args) -> if List.exists (fun t -> try aux k t;false with NotGuarded _ -> true) args then let fl,_,_ = E.get_checked_fixes_or_cofixes r in @@ -765,12 +885,13 @@ and guarded_by_destructors r_uri r_len ~subst ~metasenv context recfuns t = List.split (List.map (fun (_,name,_,ty,bo) -> (name, C.Decl ty), bo) fl) in let fl_len = List.length fl in - let bos = List.map (debruijn uri fl_len context) bos in + let bos = List.map (debruijn uri fl_len context ~subst) bos in let j = List.fold_left min max_int (List.map (fun (_,_,i,_,_)->i) fl) in let ctx_len = List.length context in (* we may look for fixed params not only up to j ... *) let fa = fixed_args bos j ctx_len (ctx_len + fl_len) in - list_iter_default2 (fun x b -> if not b then aux k x) args false fa; + HExtlib.list_iter_default2 + (fun x b -> if not b then aux k x) args false fa; let context = context@ctx_tys in let ctx_len = List.length context in let extra_recfuns = @@ -805,13 +926,9 @@ and guarded_by_destructors r_uri r_len ~subst ~metasenv context recfuns t = ) bos in List.iter (fun (bo,k) -> aux k bo) bos_and_ks - | C.Match (Ref.Ref (_,uri,_) as ref,outtype,term,pl) as t -> + | C.Match (Ref.Ref (_,Ref.Ind (true,_,_)),outtype,term,pl) as t -> (match R.whd ~subst context term with | C.Rel m | C.Appl (C.Rel m :: _ ) as t when is_safe m recfuns || m = x -> - (* TODO: add CoInd to references so that this call is useless *) - let isinductive, _, _, _, _ = E.get_checked_indtys ref in - if not isinductive then recursor aux k t - else let ty = typeof ~subst ~metasenv context term in let dc_ctx, dcl, start, stop = specialize_and_abstract_constrs ~subst r_uri r_len context ty in @@ -843,16 +960,15 @@ and guarded_by_constructors ~subst ~metasenv context t indURI indlen nn = | C.Sort _ | C.Implicit _ | C.Prod _ - | C.Const (Ref.Ref (_,_,Ref.Ind _)) + | C.Const (Ref.Ref (_,Ref.Ind _)) | C.LetIn _ -> raise (AssertFailure (lazy "17")) | C.Lambda (name,so,de) -> does_not_occur ~subst context n nn so && aux ((name,C.Decl so)::context) (n + 1) (nn + 1) h de | C.Appl ((C.Rel m)::tl) when m > n && m <= nn -> h && List.for_all (does_not_occur ~subst context n nn) tl - | C.Const (Ref.Ref (_,_,Ref.Con _)) -> true - | C.Appl (C.Const (Ref.Ref (_,uri, Ref.Con (_,j)) as ref) :: tl) as t -> - let _, paramsno, _, _, _ = E.get_checked_indtys ref in + | C.Const (Ref.Ref (_,Ref.Con _)) -> true + | C.Appl (C.Const (Ref.Ref (_, Ref.Con (_,j,paramsno))) :: tl) as t -> let ty_t = typeof ~subst ~metasenv context t in let dc_ctx, dcl, start, stop = specialize_and_abstract_constrs ~subst indURI indlen context ty_t in @@ -871,8 +987,7 @@ and guarded_by_constructors ~subst ~metasenv context t indURI indlen nn = ("Too many args for constructor: " ^ String.concat " " (List.map (fun x-> PP.ppterm ~subst ~metasenv ~context x) args)))) in - let left, args = HExtlib.split_nth paramsno tl in - List.for_all (does_not_occur ~subst context n nn) left && + let _, args = HExtlib.split_nth paramsno tl in analyse_instantiated_type rec_params args | C.Appl ((C.Match (_,out,te,pl))::_) | C.Match (_,out,te,pl) as t -> @@ -881,8 +996,11 @@ and guarded_by_constructors ~subst ~metasenv context t indURI indlen nn = does_not_occur ~subst context n nn out && does_not_occur ~subst context n nn te && List.for_all (aux context n nn h) pl - | C.Const (Ref.Ref (_,u,(Ref.Fix _| Ref.CoFix _)) as ref) - | C.Appl(C.Const (Ref.Ref(_,u,(Ref.Fix _| Ref.CoFix _)) as ref) :: _) as t -> +(* IMPOSSIBLE unsless we allow to pass cofix to other fix/cofix as we do for + higher order fix in g_b_destructors. + + | C.Const (Ref.Ref (u,(Ref.Fix _| Ref.CoFix _)) as ref) + | C.Appl(C.Const (Ref.Ref(u,(Ref.Fix _| Ref.CoFix _)) as ref) :: _) as t -> let tl = match t with C.Appl (_::tl) -> tl | _ -> [] in let fl,_,_ = E.get_checked_fixes_or_cofixes ref in let len = List.length fl in @@ -892,13 +1010,14 @@ and guarded_by_constructors ~subst ~metasenv context t indURI indlen nn = (fun (_,_,_,_,bo) -> aux (context@tys) n nn h (debruijn u len context bo)) fl +*) | C.Const _ | C.Appl _ as t -> does_not_occur ~subst context n nn t in aux context 0 nn false t and recursive_args ~subst ~metasenv context n nn te = - match R.whd context te with + match R.whd ~subst context te with | C.Rel _ | C.Appl _ | C.Const _ -> [] | C.Prod (name,so,de) -> (not (does_not_occur ~subst context n nn so)) :: @@ -927,15 +1046,13 @@ and is_really_smaller | C.Appl (he::_) -> is_really_smaller r_uri r_len ~subst ~metasenv k he | C.Rel _ - | C.Const (Ref.Ref (_,_,Ref.Con _)) -> false + | C.Const (Ref.Ref (_,Ref.Con _)) -> false | C.Appl [] - | C.Const (Ref.Ref (_,_,Ref.Fix _)) -> assert false + | C.Const (Ref.Ref (_,Ref.Fix _)) -> assert false | C.Meta _ -> true - | C.Match (Ref.Ref (_,uri,_) as ref,outtype,term,pl) -> + | C.Match (Ref.Ref (_,Ref.Ind (isinductive,_,_)),_,term,pl) -> (match term with | C.Rel m | C.Appl (C.Rel m :: _ ) when is_safe m recfuns || m = x -> - (* TODO: add CoInd to references so that this call is useless *) - let isinductive, _, _, _, _ = E.get_checked_indtys ref in if not isinductive then List.for_all (is_really_smaller r_uri r_len ~subst ~metasenv k) pl else @@ -953,50 +1070,209 @@ and is_really_smaller and returns_a_coinductive ~subst context ty = match R.whd ~subst context ty with - | C.Const (Ref.Ref (_,uri,Ref.Ind _) as ref) - | C.Appl (C.Const (Ref.Ref (_,uri,Ref.Ind _) as ref)::_) -> - let isinductive, _, itl, _, _ = E.get_checked_indtys ref in - if isinductive then None else (Some (uri,List.length itl)) + | C.Const (Ref.Ref (uri,Ref.Ind (false,_,_)) as ref) + | C.Appl (C.Const (Ref.Ref (uri,Ref.Ind (false,_,_)) as ref)::_) -> + let _, _, itl, _, _ = E.get_checked_indtys ref in + Some (uri,List.length itl) | C.Prod (n,so,de) -> returns_a_coinductive ~subst ((n,C.Decl so)::context) de | _ -> None -and type_of_constant ((Ref.Ref (_,uri,_)) as ref) = +and type_of_constant ((Ref.Ref (uri,_)) as ref) = + let error () = + raise (TypeCheckerFailure (lazy "Inconsistent cached infos in reference")) + in match E.get_checked_obj uri, ref with - | (_,_,_,_,C.Inductive (_,_,tl,_)), Ref.Ref (_,_,Ref.Ind i) -> + | (_,_,_,_,C.Inductive(isind1,lno1,tl,_)),Ref.Ref(_,Ref.Ind (isind2,i,lno2))-> + if isind1 <> isind2 || lno1 <> lno2 then error (); let _,_,arity,_ = List.nth tl i in arity - | (_,_,_,_,C.Inductive (_,_,tl,_)), Ref.Ref (_,_,Ref.Con (i,j)) -> + | (_,_,_,_,C.Inductive (_,lno1,tl,_)), Ref.Ref (_,Ref.Con (i,j,lno2)) -> + if lno1 <> lno2 then error (); let _,_,_,cl = List.nth tl i in let _,_,arity = List.nth cl (j-1) in arity - | (_,_,_,_,C.Fixpoint (_,fl,_)), Ref.Ref (_,_,(Ref.Fix (i,_)|Ref.CoFix i)) -> + | (_,_,_,_,C.Fixpoint (false,fl,_)), Ref.Ref (_,Ref.CoFix i) -> let _,_,_,arity,_ = List.nth fl i in arity - | (_,_,_,_,C.Constant (_,_,_,ty,_)), Ref.Ref (_,_,(Ref.Def |Ref.Decl)) -> ty - | _ -> raise (AssertFailure (lazy "type_of_constant: environment/reference")) + | (_,h1,_,_,C.Fixpoint (true,fl,_)), Ref.Ref (_,Ref.Fix (i,recno2,h2)) -> + let _,_,recno1,arity,_ = List.nth fl i in + if h1 <> h2 || recno1 <> recno2 then error (); + arity + | (_,_,_,_,C.Constant (_,_,None,ty,_)), Ref.Ref (_,Ref.Decl) -> ty + | (_,h1,_,_,C.Constant (_,_,Some _,ty,_)), Ref.Ref (_,Ref.Def h2) -> + if h1 <> h2 then error (); + ty + | _ -> + raise (AssertFailure + (lazy ("type_of_constant: environment/reference: " ^ + Ref.string_of_reference ref))) + +and get_relevance ~metasenv ~subst context t args = + let ty = typeof ~subst ~metasenv context t in + let rec aux context ty = function + | [] -> [] + | arg::tl -> match R.whd ~subst context ty with + | C.Prod (_,so,de) -> + let sort = typeof ~subst ~metasenv context so in + let new_ty = S.subst ~avoid_beta_redexes:true arg de in + (*prerr_endline ("so: " ^ PP.ppterm ~subst ~metasenv:[] + ~context so); + prerr_endline ("sort: " ^ PP.ppterm ~subst ~metasenv:[] + ~context sort);*) + (match R.whd ~subst context sort with + | C.Sort C.Prop -> + false::(aux context new_ty tl) + | C.Sort _ + | C.Meta _ -> true::(aux context new_ty tl) + | _ -> raise (TypeCheckerFailure (lazy (Printf.sprintf + "Prod: the type %s of the source of %s is not a sort" + (PP.ppterm ~subst ~metasenv ~context sort) + (PP.ppterm ~subst ~metasenv ~context so))))) + | _ -> + raise + (TypeCheckerFailure + (lazy (Printf.sprintf + "Appl: %s is not a function, it cannot be applied" + (PP.ppterm ~subst ~metasenv ~context + (let res = List.length tl in + let eaten = List.length args - res in + (C.Appl + (t::fst + (HExtlib.split_nth eaten args)))))))) + in aux context ty args +;; + +let typecheck_context ~metasenv ~subst context = + ignore + (List.fold_right + (fun d context -> + begin + match d with + _,C.Decl t -> ignore (typeof ~metasenv ~subst:[] context t) + | name,C.Def (te,ty) -> + ignore (typeof ~metasenv ~subst:[] context ty); + let ty' = typeof ~metasenv ~subst:[] context te in + if not (R.are_convertible ~metasenv ~subst context ty' ty) then + raise (AssertFailure (lazy (Printf.sprintf ( + "the type of the definiens for %s in the context is not "^^ + "convertible with the declared one.\n"^^ + "inferred type:\n%s\nexpected type:\n%s") + name (PP.ppterm ~subst ~metasenv ~context ty') + (PP.ppterm ~subst ~metasenv ~context ty)))) + end; + d::context + ) context []) +;; + +let typecheck_metasenv metasenv = + ignore + (List.fold_left + (fun metasenv (i,(_,context,ty) as conj) -> + if List.mem_assoc i metasenv then + raise (TypeCheckerFailure (lazy ("duplicate meta " ^ string_of_int i ^ + " in metasenv"))); + typecheck_context ~metasenv ~subst:[] context; + ignore (typeof ~metasenv ~subst:[] context ty); + metasenv @ [conj] + ) [] metasenv) +;; + +let typecheck_subst ~metasenv subst = + ignore + (List.fold_left + (fun subst (i,(_,context,ty,bo) as conj) -> + if List.mem_assoc i subst then + raise (AssertFailure (lazy ("duplicate meta " ^ string_of_int i ^ + " in substitution"))); + if List.mem_assoc i metasenv then + raise (AssertFailure (lazy ("meta " ^ string_of_int i ^ + " is both in the metasenv and in the substitution"))); + typecheck_context ~metasenv ~subst context; + ignore (typeof ~metasenv ~subst context ty); + let ty' = typeof ~metasenv ~subst context bo in + if not (R.are_convertible ~metasenv ~subst context ty' ty) then + raise (AssertFailure (lazy (Printf.sprintf ( + "the type of the definiens for %d in the substitution is not "^^ + "convertible with the declared one.\n"^^ + "inferred type:\n%s\nexpected type:\n%s") + i + (PP.ppterm ~subst ~metasenv ~context ty') + (PP.ppterm ~subst ~metasenv ~context ty)))); + subst @ [conj] + ) [] subst) +;; + +let height_of_term tl = + let h = ref 0 in + let get_height (NReference.Ref (uri,_)) = + let _,height,_,_,_ = NCicEnvironment.get_checked_obj uri in + height in + let rec aux = + function + NCic.Meta (_,(_,NCic.Ctx l)) -> List.iter aux l + | NCic.Meta _ -> () + | NCic.Rel _ + | NCic.Sort _ -> () + | NCic.Implicit _ -> assert false + | NCic.Const nref -> h := max !h (get_height nref) + | NCic.Prod (_,t1,t2) + | NCic.Lambda (_,t1,t2) -> aux t1; aux t2 + | NCic.LetIn (_,s,ty,t) -> aux s; aux ty; aux t + | NCic.Appl l -> List.iter aux l + | NCic.Match (_,outty,t,pl) -> aux outty; aux t; List.iter aux pl + in + List.iter aux tl; + 1 + !h +;; + +let height_of_obj_kind uri ~subst = + function + NCic.Inductive _ + | NCic.Constant (_,_,None,_,_) + | NCic.Fixpoint (false,_,_) -> 0 + | NCic.Fixpoint (true,ifl,_) -> + let iflno = List.length ifl in + height_of_term + (List.fold_left + (fun l (_,_,_,ty,bo) -> + let bo = debruijn uri iflno [] ~subst bo in + ty::bo::l + ) [] ifl) + | NCic.Constant (_,_,Some bo,ty,_) -> height_of_term [bo;ty] ;; let typecheck_obj (uri,height,metasenv,subst,kind) = - (* CSC: here we should typecheck the metasenv and the subst *) - assert (metasenv = [] && subst = []); +(*height must be checked since it is not only an optimization during reduction*) + let iheight = height_of_obj_kind uri ~subst kind in + if height <> iheight then + raise (TypeCheckerFailure (lazy (Printf.sprintf + "the declared object height (%d) is not the inferred one (%d)" + height iheight))); + typecheck_metasenv metasenv; + typecheck_subst ~metasenv subst; match kind with - | C.Constant (_,_,Some te,ty,_) -> + | C.Constant (relevance,_,Some te,ty,_) -> let _ = typeof ~subst ~metasenv [] ty in let ty_te = typeof ~subst ~metasenv [] te in - if not (R.are_convertible ~subst ~metasenv [] ty_te ty) then + if not (R.are_convertible ~metasenv ~subst [] ty_te ty) then raise (TypeCheckerFailure (lazy (Printf.sprintf ( "the type of the body is not convertible with the declared one.\n"^^ "inferred type:\n%s\nexpected type:\n%s") (PP.ppterm ~subst ~metasenv ~context:[] ty_te) - (PP.ppterm ~subst ~metasenv ~context:[] ty)))) - | C.Constant (_,_,None,ty,_) -> ignore (typeof ~subst ~metasenv [] ty) - | C.Inductive (is_ind, leftno, tyl, _) -> - check_mutual_inductive_defs uri ~metasenv ~subst is_ind leftno tyl + (PP.ppterm ~subst ~metasenv ~context:[] ty)))); + check_relevance ~subst ~metasenv [] relevance ty + (*check_relevance ~in_type:false ~subst ~metasenv relevance te*) + | C.Constant (relevance,_,None,ty,_) -> + ignore (typeof ~subst ~metasenv [] ty); + check_relevance ~subst ~metasenv [] relevance ty + | C.Inductive (_, leftno, tyl, _) -> + check_mutual_inductive_defs uri ~metasenv ~subst leftno tyl | C.Fixpoint (inductive,fl,_) -> let types, kl = List.fold_left - (fun (types,kl) (_,name,k,ty,_) -> + (fun (types,kl) (relevance,name,k,ty,_) -> let _ = typeof ~subst ~metasenv [] ty in + check_relevance ~subst ~metasenv [] relevance ty; ((name,C.Decl ty)::types, k::kl) ) ([],[]) fl in @@ -1004,13 +1280,13 @@ let typecheck_obj (uri,height,metasenv,subst,kind) = let dfl, kl = List.split (List.map2 (fun (_,_,_,_,bo) rno -> - let dbo = debruijn uri len [] bo in + let dbo = debruijn uri len [] ~subst bo in dbo, Evil rno) fl kl) in - List.iter2 (fun (_,name,x,ty,_) bo -> + List.iter2 (fun (_,_,x,ty,_) bo -> let ty_bo = typeof ~subst ~metasenv types bo in - if not (R.are_convertible ~subst ~metasenv types ty_bo ty) + if not (R.are_convertible ~metasenv ~subst types ty_bo ty) then raise (TypeCheckerFailure (lazy ("(Co)Fix: ill-typed bodies"))) else if inductive then begin @@ -1020,8 +1296,8 @@ let typecheck_obj (uri,height,metasenv,subst,kind) = match List.hd context with _,C.Decl t -> t | _ -> assert false in match R.whd ~subst (List.tl context) he with - | C.Const (Ref.Ref (_,uri,Ref.Ind _) as ref) - | C.Appl (C.Const (Ref.Ref (_,uri,Ref.Ind _) as ref) :: _) -> + | C.Const (Ref.Ref (uri,Ref.Ind _) as ref) + | C.Appl (C.Const (Ref.Ref (uri,Ref.Ind _) as ref) :: _) -> let _,_,itl,_,_ = E.get_checked_indtys ref in uri, List.length itl | _ -> assert false @@ -1049,7 +1325,7 @@ let typecheck_obj (uri,height,metasenv,subst,kind) = (* trust *) -let trust = ref (fun _ -> true);; +let trust = ref (fun _ -> false);; let set_trust f = trust := f let trust_obj obj = !trust obj @@ -1086,4 +1362,33 @@ E.set_typecheck_obj typecheck_obj obj) ;; +let _ = NCicReduction.set_get_relevance get_relevance;; + + +let indent = ref 0;; +let debug = true;; +let logger = + let do_indent () = String.make !indent ' ' in + (function + | `Start_type_checking s -> + if debug then + prerr_endline (do_indent () ^ "Start: " ^ NUri.string_of_uri s); + incr indent + | `Type_checking_completed s -> + decr indent; + if debug then + prerr_endline (do_indent () ^ "End: " ^ NUri.string_of_uri s) + | `Type_checking_interrupted s -> + decr indent; + if debug then + prerr_endline (do_indent () ^ "Break: " ^ NUri.string_of_uri s) + | `Type_checking_failed s -> + decr indent; + if debug then + prerr_endline (do_indent () ^ "Fail: " ^ NUri.string_of_uri s) + | `Trust_obj s -> + if debug then + prerr_endline (do_indent () ^ "Trust: " ^ NUri.string_of_uri s)) +;; +(* let _ = set_logger logger ;; *) (* EOF *)