X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Focaml%2Fcic_unification%2FcicRefine.ml;h=8935d867c570628f4f80d70eac72e9c30ce564cd;hb=c1a5a672088af4ff926e5848396c810c2539c2f5;hp=85c171b14973704f524451621f21847d1eb17c12;hpb=d8a1a68b8b7e53ba43fcad55e928a99ef5e08b8e;p=helm.git diff --git a/helm/ocaml/cic_unification/cicRefine.ml b/helm/ocaml/cic_unification/cicRefine.ml index 85c171b14..8935d867c 100644 --- a/helm/ocaml/cic_unification/cicRefine.ml +++ b/helm/ocaml/cic_unification/cicRefine.ml @@ -37,20 +37,16 @@ exception WrongUriToMutualInductiveDefinitions of string;; exception RelToHiddenHypothesis;; exception WrongArgumentNumber;; -let fdebug = ref 0;; -let debug t context = - let rec debug_aux t i = - let module C = Cic in - let module U = UriManager in - CicPp.ppobj (C.Variable ("DEBUG", None, t, [])) ^ "\n" ^ i - in - if !fdebug = 0 then - raise (NotRefinable ("\n" ^ List.fold_right debug_aux (t::context) "")) - (*print_endline ("\n" ^ List.fold_right debug_aux (t::context) "") ; flush stdout*) -;; - let debug_print = prerr_endline +let fo_unif_subst subst context metasenv t1 t2 = + try + CicUnification.fo_unif_subst subst context metasenv t1 t2 + with + (CicUnification.UnificationFailure msg) -> raise (RefineFailure msg) + | (CicUnification.Uncertain msg) -> raise (Uncertain msg) +;; + let rec split l n = match (l,n) with (l,0) -> ([], l) @@ -122,7 +118,7 @@ and check_branch n context metasenv subst left_args_no actualtype term expectedt (match R.whd subst context actualtype with C.Prod (name',so',de') -> let subst, metasenv = - Un.fo_unif_subst subst context metasenv so so' in + fo_unif_subst subst context metasenv so so' in let term' = (match CicSubstitution.lift 1 term with C.Appl l -> C.Appl (l@[C.Rel 1]) @@ -152,13 +148,11 @@ and type_of_aux' metasenv context t = _ -> raise (NotRefinable "Not a close term") ) | C.Var (uri,exp_named_subst) -> - incr fdebug ; let subst',metasenv' = check_exp_named_subst subst metasenv context exp_named_subst in let ty = CicSubstitution.subst_vars exp_named_subst (type_of_variable uri) in - decr fdebug ; ty,subst',metasenv' | C.Meta (n,l) -> let (_,canonical_context,ty) = CicUtil.lookup_meta n metasenv in @@ -169,7 +163,7 @@ and type_of_aux' metasenv context t = | C.Sort s -> C.Sort C.Type, (*CSC manca la gestione degli universi!!! *) subst,metasenv - | C.Implicit -> raise (Impossible 21) + | C.Implicit _ -> raise (Impossible 21) | C.Cast (te,ty) -> let _,subst',metasenv' = type_of_aux subst metasenv context ty in @@ -178,7 +172,7 @@ and type_of_aux' metasenv context t = in (try let subst''',metasenv''' = - Un.fo_unif_subst subst'' context metasenv'' inferredty ty + fo_unif_subst subst'' context metasenv'' inferredty ty in ty,subst''',metasenv''' with @@ -188,8 +182,7 @@ and type_of_aux' metasenv context t = let sort2,subst'',metasenv'' = type_of_aux subst' metasenv' ((Some (name,(C.Decl s)))::context) t in - sort_of_prod subst'' metasenv'' context (name,s) (sort1,sort2), - subst'',metasenv'' + sort_of_prod subst'' metasenv'' context (name,s) (sort1,sort2) | C.Lambda (n,s,t) -> let sort1,subst',metasenv' = type_of_aux subst metasenv context s in let type2,subst'',metasenv'' = @@ -199,10 +192,10 @@ and type_of_aux' metasenv context t = type_of_aux subst'' metasenv''((Some (n,(C.Decl s)))::context) type2 in (* only to check if the product is well-typed *) - let _ = + let _,subst'''',metasenv'''' = sort_of_prod subst''' metasenv''' context (n,s) (sort1,sort2) in - C.Prod (n,s,type2),subst''',metasenv''' + C.Prod (n,s,type2),subst'''',metasenv'''' | C.LetIn (n,s,t) -> (* only to check if s is well-typed *) let ty,subst',metasenv' = type_of_aux subst metasenv context s in @@ -226,23 +219,19 @@ and type_of_aux' metasenv context t = eat_prods subst'' metasenv'' context hetype tlbody_and_type | C.Appl _ -> raise (NotRefinable "Appl: no arguments") | C.Const (uri,exp_named_subst) -> - incr fdebug ; let subst',metasenv' = check_exp_named_subst subst metasenv context exp_named_subst in let cty = CicSubstitution.subst_vars exp_named_subst (type_of_constant uri) in - decr fdebug ; cty,subst',metasenv' | C.MutInd (uri,i,exp_named_subst) -> - incr fdebug ; let subst',metasenv' = check_exp_named_subst subst metasenv context exp_named_subst in let cty = CicSubstitution.subst_vars exp_named_subst (type_of_mutual_inductive_defs uri i) in - decr fdebug ; cty,subst',metasenv' | C.MutConstruct (uri,i,j,exp_named_subst) -> let subst',metasenv' = @@ -289,7 +278,7 @@ and type_of_aux' metasenv context t = in let actual_type = CicMetaSubst.whd subst context actual_type in let subst,metasenv = - Un.fo_unif_subst subst context metasenv expected_type actual_type + fo_unif_subst subst context metasenv expected_type actual_type in (* TODO: check if the sort elimination is allowed: [(I q1 ... qr)|B] *) let (_,outtypeinstances,subst,metasenv) = @@ -339,7 +328,7 @@ and type_of_aux' metasenv context t = *) CicMetaSubst.whd subst context appl in - Un.fo_unif_subst subst context metasenv instance instance') + fo_unif_subst subst context metasenv instance instance') (subst,metasenv) outtypeinstances in CicMetaSubst.whd subst context (C.Appl(outtype::right_args@[term])),subst,metasenv @@ -359,7 +348,7 @@ and type_of_aux' metasenv context t = let ty_of_bo,subst,metasenv = type_of_aux subst metasenv context' bo in - Un.fo_unif_subst subst context' metasenv + fo_unif_subst subst context' metasenv ty_of_bo (CicMetaSubst.lift subst len ty) ) (subst,metasenv) fl in let (_,_,ty,_) = List.nth fl i in @@ -380,7 +369,7 @@ and type_of_aux' metasenv context t = let ty_of_bo,subst,metasenv = type_of_aux subst metasenv context' bo in - Un.fo_unif_subst subst context' metasenv + fo_unif_subst subst context' metasenv ty_of_bo (CicMetaSubst.lift subst len ty) ) (subst,metasenv) fl in @@ -419,16 +408,16 @@ and type_of_aux' metasenv context t = subst,metasenv | Some t,Some (_,C.Def (ct,_)) -> (try - CicUnification.fo_unif_subst subst context metasenv t ct - with _ -> raise (NotRefinable (sprintf "The local context is not consistent with the canonical context, since %s cannot be unified with %s" (CicMetaSubst.ppterm subst t) (CicMetaSubst.ppterm subst ct)))) + fo_unif_subst subst context metasenv t ct + with e -> raise (NotRefinable (sprintf "The local context is not consistent with the canonical context, since %s cannot be unified with %s. Reason: %s" (CicMetaSubst.ppterm subst t) (CicMetaSubst.ppterm subst ct) (match e with CicUnification.AssertFailure msg -> msg | _ -> (Printexc.to_string e))))) | Some t,Some (_,C.Decl ct) -> let inferredty,subst',metasenv' = type_of_aux subst metasenv context t in (try - CicUnification.fo_unif_subst + fo_unif_subst subst' context metasenv' inferredty ct - with _ -> raise (NotRefinable (sprintf "The local context is not consistent with the canonical context, since the type %s of %s cannot be unified with the expected type %s" (CicMetaSubst.ppterm subst' inferredty) (CicMetaSubst.ppterm subst' t) (CicMetaSubst.ppterm subst' ct)))) + with e -> raise (NotRefinable (sprintf "The local context is not consistent with the canonical context, since the type %s of %s cannot be unified with the expected type %s. Reason: %s" (CicMetaSubst.ppterm subst' inferredty) (CicMetaSubst.ppterm subst' t) (CicMetaSubst.ppterm subst' ct) (match e with CicUnification.AssertFailure msg -> msg | _ -> (Printexc.to_string e))))) | None, Some _ -> raise (NotRefinable (sprintf "Not well typed metavariable instance %s: the local context does not instantiate an hypothesis even if the hypothesis is not restricted in the canonical context %s" @@ -456,8 +445,7 @@ and type_of_aux' metasenv context t = in try let metasubst'',metasenv'' = - CicUnification.fo_unif_subst - metasubst' context metasenv' typeoft typeofvar + fo_unif_subst metasubst' context metasenv' typeoft typeofvar in check_exp_named_subst_aux metasubst'' metasenv'' (substs@[subst]) tl with _ -> @@ -467,23 +455,29 @@ and type_of_aux' metasenv context t = and sort_of_prod subst metasenv context (name,s) (t1, t2) = let module C = Cic in + let context_for_t2 = (Some (name,C.Decl s))::context in let t1'' = CicMetaSubst.whd subst context t1 in - let t2'' = CicMetaSubst.whd subst ((Some (name,C.Decl s))::context) t2 in + let t2'' = CicMetaSubst.whd subst context_for_t2 t2 in match (t1'', t2'') with (C.Sort s1, C.Sort s2) when (s2 = C.Prop or s2 = C.Set or s2 = C.CProp) -> (* different than Coq manual!!! *) - C.Sort s2 + C.Sort s2,subst,metasenv | (C.Sort s1, C.Sort s2) -> (*CSC manca la gestione degli universi!!! *) - C.Sort C.Type - | (C.Meta _,_) | (_,C.Meta _) -> + C.Sort C.Type,subst,metasenv + | (C.Meta _, C.Sort _) -> t2'',subst,metasenv + | (C.Sort _,C.Meta _) | (C.Meta _,C.Meta _) -> (* TODO how can we force the meta to become a sort? If we don't we * brake the invariant that refine produce only well typed terms *) (* TODO if we check the non meta term and if it is a sort then we are * likely to know the exact value of the result e.g. if the rhs is a * Sort (Prop | Set | CProp) then the result is the rhs *) - (C.Sort C.Type) -(* t2'' *) + let (metasenv,idx) = + CicMkImplicit.mk_implicit_sort metasenv in + let (subst, metasenv) = + fo_unif_subst subst context_for_t2 metasenv (C.Meta (idx,[])) t2'' + in + t2'',subst,metasenv | (_,_) -> raise (NotRefinable (sprintf "Two types were expected, found %s (that reduces to %s) and %s (that reduces to %s)" @@ -502,26 +496,36 @@ and type_of_aux' metasenv context t = | Some t -> Some (CicMetaSubst.lift subst 1 t) ) args in let argty' = CicMetaSubst.lift subst (List.length args) argty in - let context'' = Some (Cic.Anonymous, Cic.Decl argty') :: context' in + let name = + (* The name must be fresh for (context'@context). *) + (* Nevertheless, argty is well-typed only in context. *) + (* Thus I generate a name (name_hint) in context and *) + (* then I generate a name --- using the hint name_hint *) + (* --- that is fresh in (context'@context). *) + let name_hint = + FreshNamesGenerator.mk_fresh_name + (CicMetaSubst.apply_subst_metasenv subst metasenv) + (CicMetaSubst.apply_subst_context subst context) + Cic.Anonymous + (CicMetaSubst.apply_subst subst argty) + in + (* [] and (Cic.Sort Cic.prop) are dummy: they will not be used *) + FreshNamesGenerator.mk_fresh_name + [] (context'@context) name_hint (Cic.Sort Cic.Prop) + in + let context'' = Some (name, Cic.Decl argty') :: context' in let (metasenv, idx) = - CicMkImplicit.mk_implicit metasenv (context'' @ context) in + CicMkImplicit.mk_implicit_type metasenv (context'' @ context) in let irl = (Some (Cic.Rel 1))::args' @ (CicMkImplicit.identity_relocation_list_for_metavariable ~start:2 context) in let newmeta = Cic.Meta (idx, irl) in - let prod = - Cic.Prod - (FreshNamesGenerator.mk_fresh_name - (CicMetaSubst.apply_subst_metasenv subst metasenv) - (CicMetaSubst.apply_subst_context subst context) - Cic.Anonymous - (CicMetaSubst.apply_subst subst argty), - argty, newmeta) in + let prod = Cic.Prod (name, argty, newmeta) in let (_, subst, metasenv) = type_of_aux subst metasenv context prod in let (subst, metasenv) = - CicUnification.fo_unif_subst subst context metasenv resty prod + fo_unif_subst subst context metasenv resty prod in aux context'' (Some arg :: args) (CicMetaSubst.subst subst arg newmeta, subst, metasenv) tl @@ -532,11 +536,42 @@ and type_of_aux' metasenv context t = let ty,subst',metasenv' = type_of_aux [] metasenv context t in - (FreshNamesGenerator.clean_dummy_dependent_types - (CicMetaSubst.apply_subst subst' t), - FreshNamesGenerator.clean_dummy_dependent_types - (CicMetaSubst.apply_subst subst' ty), - CicMetaSubst.apply_subst_metasenv subst' metasenv') + let substituted_t = CicMetaSubst.apply_subst subst' t in + let substituted_ty = CicMetaSubst.apply_subst subst' ty in + let substituted_metasenv = + CicMetaSubst.apply_subst_metasenv subst' metasenv' + in + let cleaned_t = + FreshNamesGenerator.clean_dummy_dependent_types substituted_t in + let cleaned_ty = + FreshNamesGenerator.clean_dummy_dependent_types substituted_ty in + let cleaned_metasenv = + List.map + (function (n,context,ty) -> + let ty' = FreshNamesGenerator.clean_dummy_dependent_types ty in + let context' = + List.map + (function + None -> None + | Some (n, Cic.Decl t) -> + Some (n, + Cic.Decl (FreshNamesGenerator.clean_dummy_dependent_types t)) + | Some (n, Cic.Def (bo,ty)) -> + let bo' = FreshNamesGenerator.clean_dummy_dependent_types bo in + let ty' = + match ty with + None -> None + | Some ty -> + Some (FreshNamesGenerator.clean_dummy_dependent_types ty) + in + Some (n, Cic.Def (bo',ty')) + ) context + in + (n,context',ty') + ) substituted_metasenv + in + (cleaned_t,cleaned_ty,cleaned_metasenv) + ;; (* DEBUGGING ONLY *) @@ -555,10 +590,6 @@ let type_of_aux' metasenv context term = debug_print "@@@ REFINE FAILED: CicUnification.AssertFailure:"; debug_print msg; raise e - | CicUnification.UnificationFailure msg as e -> - debug_print "@@@ REFINE FAILED: CicUnification.UnificationFailure:"; - debug_print msg; - raise e | e -> debug_print ("@@@ REFINE FAILED: " ^ Printexc.to_string e) ; raise e