From: Stefano Zacchiroli Date: Thu, 22 Jan 2004 10:26:32 +0000 (+0000) Subject: better exception and error messages X-Git-Tag: V_0_5_1_3~11 X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=commitdiff_plain;h=dc9e2d7251f23bce441aa19a13f70d309a7c35fd;p=helm.git better exception and error messages --- diff --git a/helm/ocaml/cic_proof_checking/cicTypeChecker.ml b/helm/ocaml/cic_proof_checking/cicTypeChecker.ml index 0d171604d..2ba10d742 100644 --- a/helm/ocaml/cic_proof_checking/cicTypeChecker.ml +++ b/helm/ocaml/cic_proof_checking/cicTypeChecker.ml @@ -23,21 +23,13 @@ * http://cs.unibo.it/helm/. *) -type type_checker_exn = - Impossible of int - | NotWellTyped of string - | WrongUriToConstant of string - | WrongUriToVariable of string - | WrongUriToMutualInductiveDefinitions of string - | ListTooShort - | NotPositiveOccurrences of string - | NotWellFormedTypeOfInductiveConstructor of string - | WrongRequiredArgument of string - | RelToHiddenHypothesis - | MetasenvInconsistency;; +(* TODO factorize functions to frequent errors (e.g. "Unknwon mutual inductive + * ...") *) -(* This is the only exception that will be raised *) -exception TypeCheckerFailure of type_checker_exn;; +open Printf + +exception AssertFailure of string;; +exception TypeCheckerFailure of string;; let fdebug = ref 0;; let debug t context = @@ -47,17 +39,17 @@ let debug t context = CicPp.ppobj (C.Variable ("DEBUG", None, t, [])) ^ "\n" ^ i in if !fdebug = 0 then - raise - (TypeCheckerFailure - (NotWellTyped ("\n" ^ List.fold_right debug_aux (t::context) ""))) - (*print_endline ("\n" ^ List.fold_right debug_aux (t::context) "") ; flush stdout*) + raise (TypeCheckerFailure (List.fold_right debug_aux (t::context) "")) ;; +let debug_print = prerr_endline ;; + let rec split l n = match (l,n) with (l,0) -> ([], l) | (he::tl, n) -> let (l1,l2) = split tl (n-1) in (he::l1,l2) - | (_,_) -> raise (TypeCheckerFailure ListTooShort) + | (_,_) -> + raise (TypeCheckerFailure "Parameters number < left parameters number") ;; let debrujin_constructor uri number_of_types = @@ -66,7 +58,7 @@ let debrujin_constructor uri number_of_types = function C.Rel n as t when n <= k -> t | C.Rel _ -> - raise (TypeCheckerFailure (NotWellTyped ("Debrujin: open term found"))) + raise (TypeCheckerFailure "unbound variable found in constructor type") | C.Var (uri,exp_named_subst) -> let exp_named_subst' = List.map (function (uri,t) -> (uri,aux k t)) exp_named_subst @@ -87,11 +79,9 @@ let debrujin_constructor uri number_of_types = C.Const (uri,exp_named_subst') | C.MutInd (uri',tyno,exp_named_subst) when UriManager.eq uri uri' -> if exp_named_subst != [] then - raise - (TypeCheckerFailure - (NotWellTyped - ("Debrujin: a non-empty explicit named substitution is applied to "^ - "a mutual inductive type which is being defined"))) ; + raise (TypeCheckerFailure + ("non-empty explicit named substitution is applied to "^ + "a mutual inductive type which is being defined")) ; C.Rel (k + number_of_types - tyno) ; | C.MutInd (uri',tyno,exp_named_subst) -> let exp_named_subst' = @@ -141,10 +131,12 @@ let rec type_of_constant uri = (match uobj with C.Constant (_,Some te,ty,_) -> let _ = type_of ty in - if not (R.are_convertible [] (type_of te) ty) then - raise - (TypeCheckerFailure - (NotWellTyped ("Constant " ^ (U.string_of_uri uri)))) + let type_of_te = type_of te in + if not (R.are_convertible [] type_of_te ty) then + raise (TypeCheckerFailure (sprintf + "the constant %s is not well typed because the type %s of the body is not convertible to the declared type %s" + (U.string_of_uri uri) (CicPp.ppterm type_of_te) + (CicPp.ppterm ty))) | C.Constant (_,None,ty,_) -> (* only to check that ty is well-typed *) let _ = type_of ty in () @@ -157,14 +149,16 @@ let rec type_of_constant uri = ) [] conjs in let _ = type_of_aux' conjs [] ty in - if not (R.are_convertible [] (type_of_aux' conjs [] te) ty) - then - raise - (TypeCheckerFailure - (NotWellTyped ("CurrentProof" ^ (U.string_of_uri uri)))) + let type_of_te = type_of_aux' conjs [] te in + if not (R.are_convertible [] type_of_te ty) then + raise (TypeCheckerFailure (sprintf + "the current proof %s is not well typed because the type %s of the body is not convertible to the declared type %s" + (U.string_of_uri uri) (CicPp.ppterm type_of_te) + (CicPp.ppterm ty))) | _ -> - raise (TypeCheckerFailure (WrongUriToConstant (U.string_of_uri uri))) - ) ; + raise (TypeCheckerFailure + ("Unknown constant:" ^ U.string_of_uri uri)) + ); CicEnvironment.set_type_checking_info uri ; CicLogger.log (`Type_checking_completed uri) ; match CicEnvironment.is_type_checked ~trust:false uri with @@ -174,7 +168,8 @@ let rec type_of_constant uri = match cobj with C.Constant (_,_,ty,_) -> ty | C.CurrentProof (_,_,_,ty,_) -> ty - | _ -> raise (TypeCheckerFailure (WrongUriToConstant (U.string_of_uri uri))) + | _ -> + raise (TypeCheckerFailure ("Unknown constant:" ^ U.string_of_uri uri)) and type_of_variable uri = let module C = Cic in @@ -191,16 +186,14 @@ and type_of_variable uri = None -> () | Some bo -> if not (R.are_convertible [] (type_of bo) ty) then - raise - (TypeCheckerFailure - (NotWellTyped ("Variable " ^ (U.string_of_uri uri)))) + raise (TypeCheckerFailure + ("Unknown variable:" ^ U.string_of_uri uri)) ) ; CicEnvironment.set_type_checking_info uri ; CicLogger.log (`Type_checking_completed uri) ; ty | _ -> - raise - (TypeCheckerFailure (WrongUriToVariable (UriManager.string_of_uri uri))) + raise (TypeCheckerFailure ("Unknown variable:" ^ U.string_of_uri uri)) and does_not_occur context n nn te = let module C = Cic in @@ -347,10 +340,7 @@ and weakly_positive context n nn uri te = weakly_positive ((Some (name,(C.Decl source)))::context) (n + 1) (nn + 1) uri dest | _ -> - raise - (TypeCheckerFailure - (NotWellFormedTypeOfInductiveConstructor - ("Guess where the error is ;-)"))) + raise (TypeCheckerFailure "Malformed inductive constructor type") (* instantiate_parameters ps (x1:T1)...(xn:Tn)C *) (* returns ((x_|ps|:T_|ps|)...(xn:Tn)C){ps_1 / x1 ; ... ; ps_|ps| / x_|ps|} *) @@ -362,7 +352,7 @@ and instantiate_parameters params c = instantiate_parameters tl (CicSubstitution.subst he ta) | (C.Cast (te,_), _) -> instantiate_parameters params te - | (t,l) -> raise (TypeCheckerFailure (Impossible 1)) + | (t,l) -> raise (AssertFailure "1") and strictly_positive context n nn te = let module C = Cic in @@ -384,9 +374,8 @@ and strictly_positive context n nn te = let (name,_,ity,cl) = List.nth tl i in (List.length tl = 1, paramsno, ity, cl, name) | _ -> - raise - (TypeCheckerFailure - (WrongUriToMutualInductiveDefinitions(U.string_of_uri uri))) + raise (TypeCheckerFailure + ("Unknown inductive type:" ^ U.string_of_uri uri)) in let (params,arguments) = split tl paramsno in let lifted_params = List.map (CicSubstitution.lift 1) params in @@ -427,24 +416,24 @@ and are_all_occurrences_positive context uri indparamsno i n nn te = match CicReduction.whd context x with C.Rel m when m = n - (indparamsno - k) -> k - 1 | _ -> - raise - (TypeCheckerFailure - (WrongRequiredArgument (UriManager.string_of_uri uri))) + raise (TypeCheckerFailure + ("Non-positive occurence in mutual inductive definition(s) " ^ + UriManager.string_of_uri uri)) ) indparamsno tl in if last = 0 then List.fold_right (fun x i -> i && does_not_occur context n nn x) tl true else - raise - (TypeCheckerFailure - (WrongRequiredArgument (UriManager.string_of_uri uri))) + raise (TypeCheckerFailure + ("Non-positive occurence in mutual inductive definition(s) " ^ + UriManager.string_of_uri uri)) | C.Rel m when m = i -> if indparamsno = 0 then true else - raise - (TypeCheckerFailure - (WrongRequiredArgument (UriManager.string_of_uri uri))) + raise (TypeCheckerFailure + ("Non-positive occurence in mutual inductive definition(s) " ^ + UriManager.string_of_uri uri)) | C.Prod (C.Anonymous,source,dest) -> strictly_positive context n nn source && are_all_occurrences_positive @@ -463,8 +452,8 @@ and are_all_occurrences_positive context uri indparamsno i n nn te = uri indparamsno (i+1) (n + 1) (nn + 1) dest | _ -> raise - (TypeCheckerFailure - (NotWellFormedTypeOfInductiveConstructor (UriManager.string_of_uri uri))) + (TypeCheckerFailure ("Malformed inductive constructor type " ^ + (UriManager.string_of_uri uri))) (* Main function to checks the correctness of a mutual *) (* inductive block definition. This is the function *) @@ -502,8 +491,8 @@ and typecheck_mutual_inductive_defs uri (itl,_,indparamsno) = debrujinedte) then raise - (TypeCheckerFailure - (NotPositiveOccurrences (U.string_of_uri uri))) + (TypeCheckerFailure ("Non positive occurence in " ^ + U.string_of_uri uri)) ) cl ; (i + 1) ) itl 1 @@ -517,9 +506,8 @@ and check_mutual_inductive_defs uri = Cic.InductiveDefinition (itl, params, indparamsno) -> typecheck_mutual_inductive_defs uri (itl,params,indparamsno) | _ -> - raise - (TypeCheckerFailure - (WrongUriToMutualInductiveDefinitions (UriManager.string_of_uri uri))) + raise (TypeCheckerFailure ("Unknown mutual inductive definition:" ^ + UriManager.string_of_uri uri)) and type_of_mutual_inductive_defs uri i = let module C = Cic in @@ -543,9 +531,8 @@ and type_of_mutual_inductive_defs uri i = let (_,_,arity,_) = List.nth dl i in arity | _ -> - raise - (TypeCheckerFailure - (WrongUriToMutualInductiveDefinitions (U.string_of_uri uri))) + raise (TypeCheckerFailure ("Unknown mutual inductive definition:" ^ + U.string_of_uri uri)) and type_of_mutual_inductive_constr uri i j = let module C = Cic in @@ -570,9 +557,8 @@ and type_of_mutual_inductive_constr uri i j = let (_,ty) = List.nth cl (j-1) in ty | _ -> - raise - (TypeCheckerFailure - (WrongUriToMutualInductiveDefinitions (U.string_of_uri uri))) + raise (TypeCheckerFailure ("Unknown mutual inductive definition:" ^ + UriManager.string_of_uri uri)) and recursive_args context n nn te = let module C = Cic in @@ -583,21 +569,20 @@ and recursive_args context n nn te = | C.Sort _ | C.Implicit | C.Cast _ (*CSC ??? *) -> - raise (TypeCheckerFailure (Impossible 3)) (* due to type-checking *) + raise (AssertFailure "3") (* due to type-checking *) | C.Prod (name,so,de) -> (not (does_not_occur context n nn so)) :: (recursive_args ((Some (name,(C.Decl so)))::context) (n+1) (nn + 1) de) | C.Lambda _ | C.LetIn _ -> - raise (TypeCheckerFailure (Impossible 4)) (* due to type-checking *) + raise (AssertFailure "4") (* due to type-checking *) | C.Appl _ -> [] - | C.Const _ -> raise (TypeCheckerFailure (Impossible 5)) + | C.Const _ -> raise (AssertFailure "5") | C.MutInd _ | C.MutConstruct _ | C.MutCase _ | C.Fix _ - | C.CoFix _ -> - raise (TypeCheckerFailure (Impossible 6)) (* due to type-checking *) + | C.CoFix _ -> raise (AssertFailure "6") (* due to type-checking *) and get_new_safes context p c rl safes n nn x = let module C = Cic in @@ -625,7 +610,7 @@ and get_new_safes context p c rl safes n nn x = (* CSC: as a branch of a case whose type is a Prod. In *) (* CSC: particular, this means that a new (C.Prod, x,_) case *) (* CSC: must be considered in this match. (e.g. x = MutCase) *) - raise (TypeCheckerFailure (Impossible 7)) + raise (AssertFailure "7") and split_prods context n te = let module C = Cic in @@ -634,7 +619,7 @@ and split_prods context n te = (0, _) -> context,te | (n, C.Prod (name,so,ta)) when n > 0 -> split_prods ((Some (name,(C.Decl so)))::context) (n - 1) ta - | (_, _) -> raise (TypeCheckerFailure (Impossible 8)) + | (_, _) -> raise (AssertFailure "8") and eat_lambdas context n te = let module C = Cic in @@ -646,7 +631,7 @@ and eat_lambdas context n te = eat_lambdas ((Some (name,(C.Decl so)))::context) (n - 1) ta in (te, k + 1, context') - | (_, _) -> raise (TypeCheckerFailure (Impossible 9)) + | (_, _) -> raise (AssertFailure "9") (*CSC: Tutto quello che segue e' l'intuzione di luca ;-) *) and check_is_really_smaller_arg context n nn kl x safes te = @@ -669,7 +654,7 @@ and check_is_really_smaller_arg context n nn kl x safes te = check_is_really_smaller_arg n nn kl x safes so && check_is_really_smaller_arg (n+1) (nn+1) kl (x+1) (List.map (fun x -> x + 1) safes) ta*) - | C.Prod _ -> raise (TypeCheckerFailure (Impossible 10)) + | C.Prod _ -> raise (AssertFailure "10") | C.Lambda (name,so,ta) -> check_is_really_smaller_arg context n nn kl x safes so && check_is_really_smaller_arg ((Some (name,(C.Decl so)))::context) @@ -682,9 +667,9 @@ and check_is_really_smaller_arg context n nn kl x safes te = (*CSC: sulla coda ci vogliono dei controlli? secondo noi no, ma *) (*CSC: solo perche' non abbiamo trovato controesempi *) check_is_really_smaller_arg context n nn kl x safes he - | C.Appl [] -> raise (TypeCheckerFailure (Impossible 11)) + | C.Appl [] -> raise (AssertFailure "11") | C.Const _ - | C.MutInd _ -> raise (TypeCheckerFailure (Impossible 12)) + | C.MutInd _ -> raise (AssertFailure "12") | C.MutConstruct _ -> false | C.MutCase (uri,i,outtype,term,pl) -> (match term with @@ -704,9 +689,9 @@ and check_is_really_smaller_arg context n nn kl x safes te = in (tys,List.length tl,isinductive,paramsno,cl') | _ -> - raise - (TypeCheckerFailure - (WrongUriToMutualInductiveDefinitions(U.string_of_uri uri))) + raise (TypeCheckerFailure + ("Unknown mutual inductive definition:" ^ + UriManager.string_of_uri uri)) in if not isinductive then List.fold_right @@ -742,9 +727,9 @@ and check_is_really_smaller_arg context n nn kl x safes te = in (tys,List.length tl,isinductive,paramsno,cl') | _ -> - raise - (TypeCheckerFailure - (WrongUriToMutualInductiveDefinitions(U.string_of_uri uri))) + raise (TypeCheckerFailure + ("Unknown mutual inductive definition:" ^ + UriManager.string_of_uri uri)) in if not isinductive then List.fold_right @@ -809,7 +794,7 @@ and guarded_by_destructors context n nn kl x safes = Some (_,C.Decl _) -> true | Some (_,C.Def (bo,_)) -> guarded_by_destructors context n nn kl x safes bo - | None -> raise (TypeCheckerFailure RelToHiddenHypothesis) + | None -> raise (TypeCheckerFailure "Reference to deleted hypothesis") ) | C.Meta _ | C.Sort _ @@ -867,9 +852,9 @@ and guarded_by_destructors context n nn kl x safes = in (tys,List.length tl,isinductive,paramsno,cl') | _ -> - raise - (TypeCheckerFailure - (WrongUriToMutualInductiveDefinitions(U.string_of_uri uri))) + raise (TypeCheckerFailure + ("Unknown mutual inductive definition:" ^ + UriManager.string_of_uri uri)) in if not isinductive then guarded_by_destructors context n nn kl x safes outtype && @@ -910,9 +895,9 @@ and guarded_by_destructors context n nn kl x safes = in (tys,List.length tl,isinductive,paramsno,cl') | _ -> - raise - (TypeCheckerFailure - (WrongUriToMutualInductiveDefinitions(U.string_of_uri uri))) + raise (TypeCheckerFailure + ("Unknown mutual inductive definition:" ^ + UriManager.string_of_uri uri)) in if not isinductive then guarded_by_destructors context n nn kl x safes outtype && @@ -996,7 +981,7 @@ and guarded_by_constructors context n nn h te args coInductiveTypeURI = | C.Prod _ | C.LetIn _ -> (* the term has just been type-checked *) - raise (TypeCheckerFailure (Impossible 17)) + raise (AssertFailure "17") | C.Lambda (name,so,de) -> does_not_occur context n nn so && guarded_by_constructors ((Some (name,(C.Decl so)))::context) @@ -1012,26 +997,24 @@ and guarded_by_constructors context n nn h te args coInductiveTypeURI = let (_,cons) = List.nth cl (j - 1) in CicSubstitution.subst_vars exp_named_subst cons | _ -> - raise - (TypeCheckerFailure - (WrongUriToMutualInductiveDefinitions - (UriManager.string_of_uri uri))) + raise (TypeCheckerFailure ("Unknown mutual inductive definition:" ^ + UriManager.string_of_uri uri)) in let rec analyse_branch context ty te = match CicReduction.whd context ty with - C.Meta _ -> raise (TypeCheckerFailure (Impossible 34)) + C.Meta _ -> raise (AssertFailure "34") | C.Rel _ | C.Var _ | C.Sort _ -> does_not_occur context n nn te | C.Implicit | C.Cast _ -> - raise (TypeCheckerFailure (Impossible 24))(* due to type-checking *) + raise (AssertFailure "24")(* due to type-checking *) | C.Prod (name,so,de) -> analyse_branch ((Some (name,(C.Decl so)))::context) de te | C.Lambda _ | C.LetIn _ -> - raise (TypeCheckerFailure (Impossible 25))(* due to type-checking *) + raise (AssertFailure "25")(* due to type-checking *) | C.Appl ((C.MutInd (uri,_,_))::_) as ty when uri == coInductiveTypeURI -> guarded_by_constructors context n nn true te [] coInductiveTypeURI @@ -1039,18 +1022,18 @@ and guarded_by_constructors context n nn h te args coInductiveTypeURI = guarded_by_constructors context n nn true te tl coInductiveTypeURI | C.Appl _ -> does_not_occur context n nn te - | C.Const _ -> raise (TypeCheckerFailure (Impossible 26)) + | C.Const _ -> raise (AssertFailure "26") | C.MutInd (uri,_,_) when uri == coInductiveTypeURI -> guarded_by_constructors context n nn true te [] coInductiveTypeURI | C.MutInd _ -> does_not_occur context n nn te - | C.MutConstruct _ -> raise (TypeCheckerFailure (Impossible 27)) + | C.MutConstruct _ -> raise (AssertFailure "27") (*CSC: we do not consider backbones with a MutCase, Fix, Cofix *) (*CSC: in head position. *) | C.MutCase _ | C.Fix _ | C.CoFix _ -> - raise (TypeCheckerFailure (Impossible 28))(* due to type-checking *) + raise (AssertFailure "28")(* due to type-checking *) in let rec analyse_instantiated_type context ty l = match CicReduction.whd context ty with @@ -1059,8 +1042,7 @@ and guarded_by_constructors context n nn h te args coInductiveTypeURI = | C.Meta _ | C.Sort _ | C.Implicit - | C.Cast _ -> - raise (TypeCheckerFailure (Impossible 29))(* due to type-checking *) + | C.Cast _ -> raise (AssertFailure "29")(* due to type-checking *) | C.Prod (name,so,de) -> begin match l with @@ -1072,21 +1054,21 @@ and guarded_by_constructors context n nn h te args coInductiveTypeURI = end | C.Lambda _ | C.LetIn _ -> - raise (TypeCheckerFailure (Impossible 30))(* due to type-checking *) + raise (AssertFailure "30")(* due to type-checking *) | C.Appl _ -> List.fold_left (fun i x -> i && does_not_occur context n nn x) true l - | C.Const _ -> raise (TypeCheckerFailure (Impossible 31)) + | C.Const _ -> raise (AssertFailure "31") | C.MutInd _ -> List.fold_left (fun i x -> i && does_not_occur context n nn x) true l - | C.MutConstruct _ -> raise (TypeCheckerFailure (Impossible 32)) + | C.MutConstruct _ -> raise (AssertFailure "32") (*CSC: we do not consider backbones with a MutCase, Fix, Cofix *) (*CSC: in head position. *) | C.MutCase _ | C.Fix _ | C.CoFix _ -> - raise (TypeCheckerFailure (Impossible 33))(* due to type-checking *) + raise (AssertFailure "33")(* due to type-checking *) in let rec instantiate_type args consty = function @@ -1105,7 +1087,7 @@ and guarded_by_constructors context n nn h te args coInductiveTypeURI = | _ -> (*CSC:We do not consider backbones with a MutCase, a *) (*CSC:FixPoint, a CoFixPoint and so on in head position.*) - raise (TypeCheckerFailure (Impossible 23)) + raise (AssertFailure "23") end | [] -> analyse_instantiated_type context consty' l (* These are all the other cases *) @@ -1194,9 +1176,8 @@ and check_allowed_sort_elimination context uri i need_dummy ind arity1 arity2 = (* is a singleton definition or the empty proposition? *) List.length cl = 1 || List.length cl = 0 | _ -> - raise - (TypeCheckerFailure - (WrongUriToMutualInductiveDefinitions (U.string_of_uri uri))) + raise (TypeCheckerFailure ("Unknown mutual inductive definition:" ^ + UriManager.string_of_uri uri)) ) | (C.Sort C.Set, C.Sort C.Prop) when need_dummy -> true | (C.Sort C.CProp, C.Sort C.Prop) when need_dummy -> true @@ -1215,9 +1196,8 @@ and check_allowed_sort_elimination context uri i need_dummy ind arity1 arity2 = List.fold_right (fun (_,x) i -> i && is_small tys paramsno x) cl true | _ -> - raise - (TypeCheckerFailure - (WrongUriToMutualInductiveDefinitions (U.string_of_uri uri))) + raise (TypeCheckerFailure ("Unknown mutual inductive definition:" ^ + UriManager.string_of_uri uri)) ) | (C.Sort C.Type, C.Sort _) when need_dummy -> true | (C.Sort C.Prop, C.Prod (name,so,ta)) when not need_dummy -> @@ -1233,9 +1213,9 @@ and check_allowed_sort_elimination context uri i need_dummy ind arity1 arity2 = (* is a singleton definition? *) List.length cl = 1 | _ -> - raise - (TypeCheckerFailure - (WrongUriToMutualInductiveDefinitions(U.string_of_uri uri))) + raise (TypeCheckerFailure + ("Unknown mutual inductive definition:" ^ + UriManager.string_of_uri uri)) ) | _ -> false ) @@ -1259,11 +1239,11 @@ and check_allowed_sort_elimination context uri i need_dummy ind arity1 arity2 = List.fold_right (fun (_,x) i -> i && is_small tys paramsno x) cl true | _ -> - raise - (TypeCheckerFailure - (WrongUriToMutualInductiveDefinitions(U.string_of_uri uri))) + raise (TypeCheckerFailure + ("Unknown mutual inductive definition:" ^ + UriManager.string_of_uri uri)) ) - | _ -> raise (TypeCheckerFailure (Impossible 19)) + | _ -> raise (AssertFailure "19") ) | (C.Sort C.Type, C.Prod (_,so,_)) when not need_dummy -> CicReduction.are_convertible context so ind @@ -1294,7 +1274,7 @@ and type_of_branch context argsno need_dummy outtype term constype = C.Prod (C.Anonymous,so,type_of_branch ((Some (name,(C.Decl so)))::context) argsno need_dummy (CicSubstitution.lift 1 outtype) term' de) - | _ -> raise (TypeCheckerFailure (Impossible 20)) + | _ -> raise (AssertFailure "20") (* check_metasenv_consistency checks that the "canonical" context of a metavariable is consitent - up to relocation via the relocation list l - @@ -1319,16 +1299,22 @@ and check_metasenv_consistency metasenv context canonical_context l = in List.iter2 (fun t ct -> - let res = match (t,ct) with - _,None -> true + | _,None -> () | Some t,Some (_,C.Def (ct,_)) -> - R.are_convertible context t ct + if not (R.are_convertible context t ct) then + raise (TypeCheckerFailure (sprintf + "Not well typed metavariable local context: expected a term convertible with %s, found %s" + (CicPp.ppterm ct) (CicPp.ppterm t))) | Some t,Some (_,C.Decl ct) -> - R.are_convertible context (type_of_aux' metasenv context t) ct - | _, _ -> false - in - if not res then raise (TypeCheckerFailure MetasenvInconsistency) + let type_t = type_of_aux' metasenv context t in + if not (R.are_convertible context type_t ct) then + raise (TypeCheckerFailure (sprintf + "Not well typed metavariable local context: expected a term of type %s, found %s of type %s" + (CicPp.ppterm ct) (CicPp.ppterm t) (CicPp.ppterm type_t))) + | None, _ -> + raise (TypeCheckerFailure + "Not well typed metavariable local context: an hypothesis, that is not hidden, is not instantiated") ) l lifted_canonical_context (* type_of_aux' is just another name (with a different scope) for type_of_aux *) @@ -1345,11 +1331,13 @@ and type_of_aux' metasenv context t = Some (_,C.Decl t) -> S.lift n t | Some (_,C.Def (_,Some ty)) -> S.lift n ty | Some (_,C.Def (bo,None)) -> - prerr_endline "##### CASO DA INVESTIGARE E CAPIRE" ; + debug_print "##### CASO DA INVESTIGARE E CAPIRE" ; type_of_aux context (S.lift n bo) - | None -> raise (TypeCheckerFailure RelToHiddenHypothesis) + | None -> raise (TypeCheckerFailure "Reference to deleted hypothesis") with - _ -> raise (TypeCheckerFailure (NotWellTyped "Not a close term")) + _ -> + raise (TypeCheckerFailure + "unbound variable found in constructor type") ) | C.Var (uri,exp_named_subst) -> incr fdebug ; @@ -1366,11 +1354,14 @@ and type_of_aux' metasenv context t = check_metasenv_consistency metasenv context canonical_context l; CicSubstitution.lift_meta l ty | C.Sort s -> C.Sort C.Type (*CSC manca la gestione degli universi!!! *) - | C.Implicit -> raise (TypeCheckerFailure (Impossible 21)) - | C.Cast (te,ty) -> + | C.Implicit -> raise (AssertFailure "21") + | C.Cast (te,ty) as t -> let _ = type_of_aux context ty in - if R.are_convertible context (type_of_aux context te) ty then ty - else raise (TypeCheckerFailure (NotWellTyped "Cast")) + if R.are_convertible context (type_of_aux context te) ty then + ty + else + raise (TypeCheckerFailure + (sprintf "Invalid cast %s" (CicPp.ppterm t))) | C.Prod (name,s,t) -> let sort1 = type_of_aux context s and sort2 = type_of_aux ((Some (name,(C.Decl s)))::context) t in @@ -1403,7 +1394,7 @@ and type_of_aux' metasenv context t = let hetype = type_of_aux context he and tlbody_and_type = List.map (fun x -> (x, type_of_aux context x)) tl in eat_prods context hetype tlbody_and_type - | C.Appl _ -> raise (TypeCheckerFailure (NotWellTyped "Appl: no arguments")) + | C.Appl _ -> raise (AssertFailure "Appl: no arguments") | C.Const (uri,exp_named_subst) -> incr fdebug ; check_exp_named_subst context exp_named_subst ; @@ -1432,7 +1423,8 @@ and type_of_aux' metasenv context t = let outsort = type_of_aux context outtype in let (need_dummy, k) = let rec guess_args context t = - match CicReduction.whd context t with + let outtype = CicReduction.whd context t in + match outtype with C.Sort _ -> (true, 0) | C.Prod (name, s, t) -> let (b, n) = guess_args ((Some (name,(C.Decl s)))::context) t in @@ -1449,8 +1441,8 @@ and type_of_aux' metasenv context t = else (b, n + 1) | _ -> - raise - (TypeCheckerFailure (NotWellTyped "MutCase: outtype ill-formed")) + raise (TypeCheckerFailure (sprintf + "Malformed case analasys' output type %s" (CicPp.ppterm outtype))) in (*CSC whd non serve dopo type_of_aux ? *) let (b, k) = guess_args context outsort in @@ -1464,23 +1456,21 @@ and type_of_aux' metasenv context t = (*CSC: Hint: nella DTD servono per gli stylesheet. *) C.MutInd (uri',i',exp_named_subst) as typ -> if U.eq uri uri' && i = i' then ([],[],exp_named_subst) - else raise (TypeCheckerFailure - (NotWellTyped ("MutCase: the term is of type " ^ - CicPp.ppterm typ ^ - " instead of type " ^ (U.string_of_uri uri) ^ "#1/" ^ - string_of_int i ^ "{_}"))) - | C.Appl ((C.MutInd (uri',i',exp_named_subst) as typ):: tl) -> + else raise (TypeCheckerFailure (sprintf + "Case analysys: analysed term type is %s, but is expected to be (an application of) %s#1/%d{_}" + (CicPp.ppterm typ) (U.string_of_uri uri) i)) + | C.Appl ((C.MutInd (uri',i',exp_named_subst) as typ):: tl) as typ' -> if U.eq uri uri' && i = i' then let params,args = split tl (List.length tl - k) in params,args,exp_named_subst - else raise (TypeCheckerFailure (NotWellTyped - ("MutCase: the term is of type " ^ - CicPp.ppterm typ ^ - " instead of type " ^ (U.string_of_uri uri) ^ "#1/" ^ - string_of_int i ^ "{_}"))) - | _ -> raise (TypeCheckerFailure - (NotWellTyped "MutCase: the term is not an inductive one")) + else raise (TypeCheckerFailure (sprintf + "Case analysys: analysed term type is %s, but is expected to be (an application of) %s#1/%d{_}" + (CicPp.ppterm typ') (U.string_of_uri uri) i)) + | _ -> + raise (TypeCheckerFailure (sprintf + "Case analysis: analysed term %s is not an inductive one" + (CicPp.ppterm term))) in (* let's control if the sort elimination is allowed: [(I q1 ... qr)|B] *) let sort_of_ind_type = @@ -1493,17 +1483,15 @@ and type_of_aux' metasenv context t = sort_of_ind_type (type_of_aux context sort_of_ind_type) outsort) then raise - (TypeCheckerFailure - (NotWellTyped "MutCase: not allowed sort elimination")) ; - + (TypeCheckerFailure ("Case analasys: sort elimination not allowed")); (* let's check if the type of branches are right *) let parsno = match CicEnvironment.get_cooked_obj ~trust:false uri with C.InductiveDefinition (_,_,parsno) -> parsno | _ -> - raise - (TypeCheckerFailure - (WrongUriToMutualInductiveDefinitions (U.string_of_uri uri))) + raise (TypeCheckerFailure + ("Unknown mutual inductive definition:" ^ + UriManager.string_of_uri uri)) in let (_,branches_ok) = List.fold_left @@ -1522,15 +1510,13 @@ let res = b && R.are_convertible context (type_of_aux context p) (type_of_branch context parsno need_dummy outtype cons (type_of_aux context cons)) -in if not res then prerr_endline ("#### " ^ CicPp.ppterm (type_of_aux context p) ^ " <==> " ^ CicPp.ppterm (type_of_branch context parsno need_dummy outtype cons (type_of_aux context cons))) ; res +in if not res then debug_print ("#### " ^ CicPp.ppterm (type_of_aux context p) ^ " <==> " ^ CicPp.ppterm (type_of_branch context parsno need_dummy outtype cons (type_of_aux context cons))) ; res ) ) (1,true) pl in if not branches_ok then raise - (TypeCheckerFailure - (NotWellTyped "MutCase: wrong type of a branch")) ; - + (TypeCheckerFailure "Case analysys: wrong branch type"); if not need_dummy then C.Appl ((outtype::arguments)@[term]) else if arguments = [] then @@ -1563,11 +1549,10 @@ in if not res then prerr_endline ("#### " ^ CicPp.ppterm (type_of_aux context p) (guarded_by_destructors context' eaten (len + eaten) kl 1 [] m) then raise - (TypeCheckerFailure - (NotWellTyped "Fix: not guarded by destructors")) + (TypeCheckerFailure ("Fix: not guarded by destructors")) end else - raise (TypeCheckerFailure (NotWellTyped "Fix: ill-typed bodies")) + raise (TypeCheckerFailure ("Fix: ill-typed bodies")) ) fl ; (*CSC: controlli mancanti solo su D{f,k,x,M} *) @@ -1593,7 +1578,7 @@ in if not res then prerr_endline ("#### " ^ CicPp.ppterm (type_of_aux context p) None -> raise (TypeCheckerFailure - (NotWellTyped "CoFix: does not return a coinductive type")) + ("CoFix: does not return a coinductive type")) | Some uri -> (*let's control the guarded by constructors conditions C{f,M}*) if @@ -1602,13 +1587,11 @@ in if not res then prerr_endline ("#### " ^ CicPp.ppterm (type_of_aux context p) [] uri) then raise - (TypeCheckerFailure - (NotWellTyped "CoFix: not guarded by constructors")) + (TypeCheckerFailure ("CoFix: not guarded by constructors")) end else raise - (TypeCheckerFailure - (NotWellTyped "CoFix: ill-typed bodies")) + (TypeCheckerFailure ("CoFix: ill-typed bodies")) ) fl ; let (_,ty,_) = List.nth fl i in @@ -1625,13 +1608,12 @@ in if not res then prerr_endline ("#### " ^ CicPp.ppterm (type_of_aux context p) Cic.Variable (_,Some bo,_,_) -> raise (TypeCheckerFailure - (NotWellTyped - "A variable with a body can not be explicit substituted")) + ("A variable with a body can not be explicit substituted")) | Cic.Variable (_,None,_,_) -> () | _ -> - raise - (TypeCheckerFailure - (WrongUriToVariable (UriManager.string_of_uri uri))) + raise (TypeCheckerFailure + ("Unknown mutual inductive definition:" ^ + UriManager.string_of_uri uri)) ) ; let typeoft = type_of_aux context t in if CicReduction.are_convertible context typeoft typeofvar then @@ -1642,9 +1624,7 @@ in if not res then prerr_endline ("#### " ^ CicPp.ppterm (type_of_aux context p) ignore (CicReduction.are_convertible context typeoft typeofvar) ; fdebug := 0 ; debug typeoft [typeofvar] ; - raise - (TypeCheckerFailure - (NotWellTyped "Wrong Explicit Named Substitution")) + raise (TypeCheckerFailure "Wrong Explicit Named Substitution") end in check_exp_named_subst_aux [] @@ -1659,10 +1639,9 @@ in if not res then prerr_endline ("#### " ^ CicPp.ppterm (type_of_aux context p) C.Sort s2 | (C.Sort s1, C.Sort s2) -> C.Sort C.Type (*CSC manca la gestione degli universi!!! *) | (_,_) -> - raise - (TypeCheckerFailure - (NotWellTyped - ("Prod: sort1= " ^ CicPp.ppterm t1' ^ " ; sort2= "^ CicPp.ppterm t2'))) + raise (TypeCheckerFailure (sprintf + "Prod: expected two sorts, found = %s, %s" (CicPp.ppterm t1') + (CicPp.ppterm t2'))) and eat_prods context hetype = (*CSC: siamo sicuri che le are_convertible non lavorino con termini non *) @@ -1682,10 +1661,13 @@ in if not res then prerr_endline ("#### " ^ CicPp.ppterm (type_of_aux context p) ignore (CicReduction.are_convertible context s hety) ; fdebug := 0 ; debug s [hety] ; - raise - (TypeCheckerFailure (NotWellTyped "Appl: wrong parameter-type")) + raise (TypeCheckerFailure (sprintf + "Appl: wrong parameter-type, expected %s, found %s" + (CicPp.ppterm hetype) (CicPp.ppterm s))) end - | _ -> raise (TypeCheckerFailure (NotWellTyped "Appl: wrong Prod-type")) + | _ -> + raise (TypeCheckerFailure + "Appl: this is not a function, it cannot be applied") ) and returns_a_coinductive context ty = @@ -1698,9 +1680,9 @@ in if not res then prerr_endline ("#### " ^ CicPp.ppterm (type_of_aux context p) let (_,is_inductive,_,_) = List.nth itl i in if is_inductive then None else (Some uri) | _ -> - raise - (TypeCheckerFailure (WrongUriToMutualInductiveDefinitions - (UriManager.string_of_uri uri))) + raise (TypeCheckerFailure + ("Unknown mutual inductive definition:" ^ + UriManager.string_of_uri uri)) ) | C.Appl ((C.MutInd (uri,i,_))::_) -> (match CicEnvironment.get_obj uri with @@ -1708,10 +1690,9 @@ in if not res then prerr_endline ("#### " ^ CicPp.ppterm (type_of_aux context p) let (_,is_inductive,_,_) = List.nth itl i in if is_inductive then None else (Some uri) | _ -> - raise - (TypeCheckerFailure - (WrongUriToMutualInductiveDefinitions - (UriManager.string_of_uri uri))) + raise (TypeCheckerFailure + ("Unknown mutual inductive definition:" ^ + UriManager.string_of_uri uri)) ) | C.Prod (n,so,de) -> returns_a_coinductive ((Some (n,C.Decl so))::context) de @@ -1719,12 +1700,12 @@ in if not res then prerr_endline ("#### " ^ CicPp.ppterm (type_of_aux context p) in (*CSC -prerr_endline ("INIZIO TYPE_OF_AUX " ^ CicPp.ppterm t) ; flush stderr ; +debug_print ("INIZIO TYPE_OF_AUX " ^ CicPp.ppterm t) ; flush stderr ; let res = *) type_of_aux context t (* -in prerr_endline "FINE TYPE_OF_AUX" ; flush stderr ; res +in debug_print "FINE TYPE_OF_AUX" ; flush stderr ; res *) (* is a small constructor? *) @@ -1745,12 +1726,12 @@ and is_small context paramsno c = and type_of t = (*CSC -prerr_endline ("INIZIO TYPE_OF_AUX' " ^ CicPp.ppterm t) ; flush stderr ; +debug_print ("INIZIO TYPE_OF_AUX' " ^ CicPp.ppterm t) ; flush stderr ; let res = *) type_of_aux' [] [] t (*CSC -in prerr_endline "FINE TYPE_OF_AUX'" ; flush stderr ; res +in debug_print "FINE TYPE_OF_AUX'" ; flush stderr ; res *) ;; @@ -1767,9 +1748,8 @@ let typecheck uri = C.Constant (_,Some te,ty,_) -> let _ = type_of ty in if not (R.are_convertible [] (type_of te ) ty) then - raise - (TypeCheckerFailure - (NotWellTyped ("Constant " ^ (U.string_of_uri uri)))) + raise (TypeCheckerFailure + ("Unknown constant:" ^ U.string_of_uri uri)) | C.Constant (_,None,ty,_) -> (* only to check that ty is well-typed *) let _ = type_of ty in () @@ -1782,11 +1762,13 @@ let typecheck uri = ) [] conjs in let _ = type_of_aux' conjs [] ty in - if not (R.are_convertible [] (type_of_aux' conjs [] te) ty) + let type_of_te = type_of_aux' conjs [] te in + if not (R.are_convertible [] type_of_te ty) then - raise - (TypeCheckerFailure - (NotWellTyped ("CurrentProof" ^ (U.string_of_uri uri)))) + raise (TypeCheckerFailure (sprintf + "the current proof %s is not well typed because the type %s of the body is not convertible to the declared type %s" + (U.string_of_uri uri) (CicPp.ppterm type_of_te) + (CicPp.ppterm ty))) | C.Variable (_,bo,ty,_) -> (* only to check that ty is well-typed *) let _ = type_of ty in @@ -1794,9 +1776,8 @@ let typecheck uri = None -> () | Some bo -> if not (R.are_convertible [] (type_of bo) ty) then - raise - (TypeCheckerFailure - (NotWellTyped ("Variable" ^ (U.string_of_uri uri)))) + raise (TypeCheckerFailure + ("Unknown variable:" ^ U.string_of_uri uri)) ) | C.InductiveDefinition _ -> check_mutual_inductive_defs uri uobj diff --git a/helm/ocaml/cic_proof_checking/cicTypeChecker.mli b/helm/ocaml/cic_proof_checking/cicTypeChecker.mli index 1dbcc11c8..d3db80a46 100644 --- a/helm/ocaml/cic_proof_checking/cicTypeChecker.mli +++ b/helm/ocaml/cic_proof_checking/cicTypeChecker.mli @@ -23,21 +23,9 @@ * http://cs.unibo.it/helm/. *) -type type_checker_exn = - Impossible of int - | NotWellTyped of string - | WrongUriToConstant of string - | WrongUriToVariable of string - | WrongUriToMutualInductiveDefinitions of string - | ListTooShort - | NotPositiveOccurrences of string - | NotWellFormedTypeOfInductiveConstructor of string - | WrongRequiredArgument of string - | RelToHiddenHypothesis - | MetasenvInconsistency;; - (* This is the only exception that will be raised *) -exception TypeCheckerFailure of type_checker_exn;; +exception TypeCheckerFailure of string +exception AssertFailure of string val typecheck : UriManager.uri -> unit