X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Focaml%2Fcic_unification%2FcicRefine.ml;h=a9593c67fb617782815a6631fcc3cfa18c9b5f06;hb=acf29bdbdcdc6ad8c2d9d27e8a47500981b605cd;hp=fe70f250aa89999161824cf26d08639dc18739a7;hpb=e8236af508187f6446f5af481d545d433628ee00;p=helm.git diff --git a/helm/ocaml/cic_unification/cicRefine.ml b/helm/ocaml/cic_unification/cicRefine.ml index fe70f250a..a9593c67f 100644 --- a/helm/ocaml/cic_unification/cicRefine.ml +++ b/helm/ocaml/cic_unification/cicRefine.ml @@ -29,7 +29,7 @@ exception RefineFailure of string;; exception Uncertain of string;; exception AssertFailure of string;; -let debug_print = prerr_endline +let debug_print = fun _ -> () let fo_unif_subst subst context metasenv t1 t2 ugraph = try @@ -46,23 +46,6 @@ let rec split l n = | (_,_) -> raise (AssertFailure "split: list too short") ;; -let look_for_coercion src tgt = - if (src = (CicUtil.term_of_uri "cic:/Coq/Init/Datatypes/nat.ind#xpointer(1/1)")) && - (tgt = (CicUtil.term_of_uri "cic:/Coq/Reals/Rdefinitions/R.con")) - then - begin - prerr_endline "TROVATA coercion"; - Some (CicUtil.term_of_uri "cic://Coq/Reals/Raxioms/INR.con") - end - else - begin - prerr_endline (sprintf "NON TROVATA la coercion %s %s" (CicPp.ppterm src) - (CicPp.ppterm tgt)); - None - end -;; - - let rec type_of_constant uri ugraph = let module C = Cic in let module R = CicReduction in @@ -178,7 +161,9 @@ and check_branch n context metasenv subst left_args_no actualtype term expectedt | t -> C.Appl [t ; C.Rel 1]) in (* we should also check that the name variable is anonymous in the actual type de' ?? *) - check_branch (n+1) ((Some (name,(C.Decl so)))::context) metasenv subst left_args_no de' term' de ugraph1 + check_branch (n+1) + ((Some (name,(C.Decl so)))::context) + metasenv subst left_args_no de' term' de ugraph1 | _ -> raise (AssertFailure "Wrong number of arguments")) | _ -> raise (AssertFailure "Prod or MutInd expected") @@ -222,17 +207,17 @@ and type_of_aux' metasenv context t ugraph = canonical_context l ugraph in (* trust or check ??? *) - C.Meta (n,l'),CicSubstitution.lift_meta l' ty, + C.Meta (n,l'),CicSubstitution.subst_meta l' ty, subst', metasenv', ugraph1 (* type_of_aux subst metasenv - context (CicSubstitution.lift_meta l term) *) + context (CicSubstitution.subst_meta l term) *) with CicUtil.Subst_not_found _ -> let (_,canonical_context,ty) = CicUtil.lookup_meta n metasenv in let l',subst',metasenv', ugraph1 = check_metasenv_consistency n subst metasenv context canonical_context l ugraph in - C.Meta (n,l'),CicSubstitution.lift_meta l' ty, + C.Meta (n,l'),CicSubstitution.subst_meta l' ty, subst', metasenv',ugraph1) | C.Sort (C.Type tno) -> let tno' = CicUniv.fresh() in @@ -251,7 +236,7 @@ and type_of_aux' metasenv context t ugraph = (try let subst''',metasenv''',ugraph3 = fo_unif_subst subst'' context metasenv'' - inferredty ty' ugraph2 + inferredty ty ugraph2 in C.Cast (te',ty'),ty',subst''',metasenv''',ugraph3 with @@ -357,13 +342,6 @@ and type_of_aux' metasenv context t ugraph = (* first, get the inductive type (and noparams) * in the environment *) let (_,b,arity,constructors), expl_params, no_left_params,ugraph = - (* - let obj = - try - CicEnvironment.get_cooked_obj ~trust:true uri - with Not_found -> assert false - in - *) let obj,u = CicEnvironment.get_obj ugraph uri in match obj with C.InductiveDefinition (l,expl_params,parsno,_) -> @@ -373,115 +351,242 @@ and type_of_aux' metasenv context t ugraph = (RefineFailure ("Unkown mutual inductive definition " ^ U.string_of_uri uri)) - in - let rec count_prod t = - match CicReduction.whd ~subst context t with - C.Prod (_, _, t) -> 1 + (count_prod t) - | _ -> 0 - in - let no_args = count_prod arity in - (* now, create a "generic" MutInd *) - let metasenv,left_args = - CicMkImplicit.n_fresh_metas metasenv subst context no_left_params - in - let metasenv,right_args = - let no_right_params = no_args - no_left_params in - if no_right_params < 0 then assert false - else CicMkImplicit.n_fresh_metas - metasenv subst context no_right_params - in - let metasenv,exp_named_subst = - CicMkImplicit.fresh_subst metasenv subst context expl_params in - let expected_type = - if no_args = 0 then - C.MutInd (uri,i,exp_named_subst) - else - C.Appl - (C.MutInd (uri,i,exp_named_subst)::(left_args @ right_args)) - in - (* check consistency with the actual type of term *) - let term',actual_type,subst,metasenv,ugraph1 = - type_of_aux subst metasenv context term ugraph in - let expected_type',_, subst, metasenv,ugraph2 = - type_of_aux subst metasenv context expected_type ugraph1 - in - let actual_type = CicReduction.whd ~subst context actual_type in - let subst,metasenv,ugraph3 = - fo_unif_subst subst context metasenv - expected_type' actual_type ugraph2 - in - (* TODO: check if the sort elimination - * is allowed: [(I q1 ... qr)|B] *) - let (pl',_,outtypeinstances,subst,metasenv,ugraph4) = - List.fold_left - (fun (pl,j,outtypeinstances,subst,metasenv,ugraph) p -> - let constructor = - if left_args = [] then - (C.MutConstruct (uri,i,j,exp_named_subst)) - else - (C.Appl (C.MutConstruct (uri,i,j,exp_named_subst)::left_args)) - in - let p',actual_type,subst,metasenv,ugraph1 = - type_of_aux subst metasenv context p ugraph - in - let constructor',expected_type, subst, metasenv,ugraph2 = - type_of_aux subst metasenv context constructor ugraph1 - in - let outtypeinstance,subst,metasenv,ugraph3 = - check_branch 0 context metasenv subst no_left_params - actual_type constructor expected_type ugraph2 - in - (pl @ [p'],j+1, - outtypeinstance::outtypeinstances,subst,metasenv,ugraph3)) - ([],1,[],subst,metasenv,ugraph3) pl - in - (* we are left to check that the outype matches his instances. - The easy case is when the outype is specified, that amount - to a trivial check. Otherwise, we should guess a type from - its instances *) - - (* easy case *) - let _,_, subst, metasenv,ugraph5 = - type_of_aux subst metasenv context - (C.Appl ((outtype :: right_args) @ [term'])) ugraph4 - in - let (subst,metasenv,ugraph6) = - List.fold_left - (fun (subst,metasenv,ugraph) (constructor_args_no,context,instance,args) -> - let instance' = - let appl = - let outtype' = - CicSubstitution.lift constructor_args_no outtype - in - C.Appl (outtype'::args) + in + let rec count_prod t = + match CicReduction.whd ~subst context t with + C.Prod (_, _, t) -> 1 + (count_prod t) + | _ -> 0 + in + let no_args = count_prod arity in + (* now, create a "generic" MutInd *) + let metasenv,left_args = + CicMkImplicit.n_fresh_metas metasenv subst context no_left_params + in + let metasenv,right_args = + let no_right_params = no_args - no_left_params in + if no_right_params < 0 then assert false + else CicMkImplicit.n_fresh_metas + metasenv subst context no_right_params + in + let metasenv,exp_named_subst = + CicMkImplicit.fresh_subst metasenv subst context expl_params in + let expected_type = + if no_args = 0 then + C.MutInd (uri,i,exp_named_subst) + else + C.Appl + (C.MutInd (uri,i,exp_named_subst)::(left_args @ right_args)) + in + (* check consistency with the actual type of term *) + let term',actual_type,subst,metasenv,ugraph1 = + type_of_aux subst metasenv context term ugraph in + let expected_type',_, subst, metasenv,ugraph2 = + type_of_aux subst metasenv context expected_type ugraph1 + in + let actual_type = CicReduction.whd ~subst context actual_type in + let subst,metasenv,ugraph3 = + fo_unif_subst subst context metasenv + expected_type' actual_type ugraph2 + in + let rec instantiate_prod t = + function + [] -> t + | he::tl -> + match CicReduction.whd ~subst context t with + C.Prod (_,_,t') -> + instantiate_prod (CicSubstitution.subst he t') tl + | _ -> assert false + in + let arity_instantiated_with_left_args = + instantiate_prod arity left_args in + (* TODO: check if the sort elimination + * is allowed: [(I q1 ... qr)|B] *) + let (pl',_,outtypeinstances,subst,metasenv,ugraph4) = + List.fold_left + (fun (pl,j,outtypeinstances,subst,metasenv,ugraph) p -> + let constructor = + if left_args = [] then + (C.MutConstruct (uri,i,j,exp_named_subst)) + else + (C.Appl + (C.MutConstruct (uri,i,j,exp_named_subst)::left_args)) + in + let p',actual_type,subst,metasenv,ugraph1 = + type_of_aux subst metasenv context p ugraph + in + let constructor',expected_type, subst, metasenv,ugraph2 = + type_of_aux subst metasenv context constructor ugraph1 + in + let outtypeinstance,subst,metasenv,ugraph3 = + check_branch 0 context metasenv subst no_left_params + actual_type constructor' expected_type ugraph2 + in + (pl @ [p'],j+1, + outtypeinstance::outtypeinstances,subst,metasenv,ugraph3)) + ([],1,[],subst,metasenv,ugraph3) pl + in + + (* we are left to check that the outype matches his instances. + The easy case is when the outype is specified, that amount + to a trivial check. Otherwise, we should guess a type from + its instances + *) + + (match outtype with + | C.Meta (n,l) -> + (let candidate,ugraph5,metasenv,subst = + let exp_name_subst, metasenv = + let o,_ = + CicEnvironment.get_obj CicUniv.empty_ugraph uri + in + let uris = CicUtil.params_of_obj o in + List.fold_right ( + fun uri (acc,metasenv) -> + let metasenv',new_meta = + CicMkImplicit.mk_implicit metasenv subst context + in + let irl = + CicMkImplicit.identity_relocation_list_for_metavariable + context + in + (uri, Cic.Meta(new_meta,irl))::acc, metasenv' + ) uris ([],metasenv) + in + let ty = + match left_args,right_args with + [],[] -> Cic.MutInd(uri, i, exp_name_subst) + | _,_ -> + let rec mk_right_args = + function + 0 -> [] + | n -> (Cic.Rel n)::(mk_right_args (n - 1)) + in + let right_args_no = List.length right_args in + let lifted_left_args = + List.map (CicSubstitution.lift right_args_no) left_args + in + Cic.Appl (Cic.MutInd(uri,i,exp_name_subst):: + (lifted_left_args @ mk_right_args right_args_no)) + in + let fresh_name = + FreshNamesGenerator.mk_fresh_name ~subst metasenv + context Cic.Anonymous ~typ:ty + in + match outtypeinstances with + | [] -> + let extended_context = + let rec add_right_args = + function + Cic.Prod (name,ty,t) -> + Some (name,Cic.Decl ty)::(add_right_args t) + | _ -> [] + in + (Some (fresh_name,Cic.Decl ty)):: + (List.rev + (add_right_args arity_instantiated_with_left_args))@ + context in - (* - (* if appl is not well typed then the type_of below solves the - * problem *) - let (_, subst, metasenv,ugraph1) = - type_of_aux subst metasenv context appl ugraph - in - *) - (* DEBUG - let prova1 = CicMetaSubst.whd subst context appl in - let prova2 = CicReduction.whd ~subst context appl in - if not (prova1 = prova2) then - begin - prerr_endline ("prova1 =" ^ (CicPp.ppterm prova1)); - prerr_endline ("prova2 =" ^ (CicPp.ppterm prova2)); - end; - *) - (* CicMetaSubst.whd subst context appl *) - CicReduction.whd ~subst context appl - in - fo_unif_subst subst context metasenv - instance instance' ugraph) - (subst,metasenv,ugraph5) outtypeinstances - in - C.MutCase (uri, i, outtype, term', pl'), - CicReduction.whd ~subst context - (C.Appl(outtype::right_args@[term])), - subst,metasenv,ugraph6 + let metasenv,new_meta = + CicMkImplicit.mk_implicit metasenv subst extended_context + in + let irl = + CicMkImplicit.identity_relocation_list_for_metavariable + extended_context + in + let rec add_lambdas b = + function + Cic.Prod (name,ty,t) -> + Cic.Lambda (name,ty,(add_lambdas b t)) + | _ -> Cic.Lambda (fresh_name, ty, b) + in + let candidate = + add_lambdas (Cic.Meta (new_meta,irl)) + arity_instantiated_with_left_args + in + (Some candidate),ugraph4,metasenv,subst + | (constructor_args_no,_,instance,_)::tl -> + try + let instance',subst,metasenv = + CicMetaSubst.delift_rels subst metasenv + constructor_args_no instance + in + let candidate,ugraph,metasenv,subst = + List.fold_left ( + fun (candidate_oty,ugraph,metasenv,subst) + (constructor_args_no,_,instance,_) -> + match candidate_oty with + | None -> None,ugraph,metasenv,subst + | Some ty -> + try + let instance',subst,metasenv = + CicMetaSubst.delift_rels subst metasenv + constructor_args_no instance + in + let subst,metasenv,ugraph = + fo_unif_subst subst context metasenv + instance' ty ugraph + in + candidate_oty,ugraph,metasenv,subst + with + CicMetaSubst.DeliftingARelWouldCaptureAFreeVariable + | CicUnification.UnificationFailure _ + | CicUnification.Uncertain _ -> + None,ugraph,metasenv,subst + ) (Some instance',ugraph4,metasenv,subst) tl + in + match candidate with + | None -> None, ugraph,metasenv,subst + | Some t -> + let rec add_lambdas n b = + function + Cic.Prod (name,ty,t) -> + Cic.Lambda (name,ty,(add_lambdas (n + 1) b t)) + | _ -> + Cic.Lambda (fresh_name, ty, + CicSubstitution.lift (n + 1) t) + in + Some + (add_lambdas 0 t arity_instantiated_with_left_args), + ugraph,metasenv,subst + with CicMetaSubst.DeliftingARelWouldCaptureAFreeVariable -> + None,ugraph4,metasenv,subst + in + match candidate with + | None -> raise (Uncertain "can't solve an higher order unification problem") + | Some candidate -> + let subst,metasenv,ugraph = + fo_unif_subst subst context metasenv + candidate outtype ugraph5 + in + C.MutCase (uri, i, outtype, term', pl'), + (Cic.Appl (outtype::right_args@[term'])), + subst,metasenv,ugraph) + | _ -> (* easy case *) + let _,_, subst, metasenv,ugraph5 = + type_of_aux subst metasenv context + (C.Appl ((outtype :: right_args) @ [term'])) ugraph4 + in + let (subst,metasenv,ugraph6) = + List.fold_left + (fun (subst,metasenv,ugraph) + (constructor_args_no,context,instance,args) -> + let instance' = + let appl = + let outtype' = + CicSubstitution.lift constructor_args_no outtype + in + C.Appl (outtype'::args) + in + CicReduction.whd ~subst context appl + in + fo_unif_subst subst context metasenv + instance instance' ugraph) + (subst,metasenv,ugraph5) outtypeinstances + in + C.MutCase (uri, i, outtype, term', pl'), + CicReduction.whd ~subst context + (C.Appl(outtype::right_args@[term])), + subst,metasenv,ugraph6) | C.Fix (i,fl) -> let fl_ty',subst,metasenv,types,ugraph1 = List.fold_left @@ -579,14 +684,14 @@ and type_of_aux' metasenv context t ugraph = function [] -> [] | (Some (n,C.Decl t))::tl -> - (Some (n,C.Decl (S.lift_meta l (S.lift i t))))::(aux (i+1) tl) + (Some (n,C.Decl (S.subst_meta l (S.lift i t))))::(aux (i+1) tl) | (Some (n,C.Def (t,None)))::tl -> - (Some (n,C.Def ((S.lift_meta l (S.lift i t)),None)))::(aux (i+1) tl) + (Some (n,C.Def ((S.subst_meta l (S.lift i t)),None)))::(aux (i+1) tl) | None::tl -> None::(aux (i+1) tl) | (Some (n,C.Def (t,Some ty)))::tl -> (Some (n, - C.Def ((S.lift_meta l (S.lift i t)), - Some (S.lift_meta l (S.lift i ty))))) :: (aux (i+1) tl) + C.Def ((S.subst_meta l (S.lift i t)), + Some (S.subst_meta l (S.lift i ty))))) :: (aux (i+1) tl) in aux 1 canonical_context in @@ -758,7 +863,7 @@ and type_of_aux' metasenv context t ugraph = try fo_unif_subst subst context metasenv hetype hetype' ugraph with exn -> - prerr_endline (Printf.sprintf "hetype=%s\nhetype'=%s\nmetasenv=%s\nsubst=%s" + debug_print (Printf.sprintf "hetype=%s\nhetype'=%s\nmetasenv=%s\nsubst=%s" (CicPp.ppterm hetype) (CicPp.ppterm hetype') (CicMetaSubst.ppmetasenv metasenv []) @@ -780,7 +885,7 @@ and type_of_aux' metasenv context t ugraph = hete,subst,metasenv,ugraph1 with exn -> (* we search a coercion from hety to s *) - let coer = look_for_coercion + let coer = CoercGraph.look_for_coercion (CicMetaSubst.apply_subst subst hety) (CicMetaSubst.apply_subst subst s) in @@ -851,6 +956,13 @@ and type_of_aux' metasenv context t ugraph = (cleaned_t,cleaned_ty,cleaned_metasenv,ugraph1) ;; +let type_of_aux' metasenv context term ugraph = + try + type_of_aux' metasenv context term ugraph + with + CicUniv.UniverseInconsistency msg -> raise (RefineFailure msg) + + (* DEBUGGING ONLY let type_of_aux' metasenv context term = try