package merlin-lib
Merlin's libraries
Install
Dune Dependency
Authors
Maintainers
Sources
merlin-5.5-503.tbz
sha256=67da3b34f2fea07678267309f61da4a2c6f08298de0dc59655b8d30fd8269af1
sha512=1fb3b5180d36aa82b82a319e15b743b802b6888f0dc67645baafdb4e18dfc23a7b90064ec9bc42f7424061cf8cde7f8839178d8a8537bf4596759f3ff4891873
doc/src/merlin-lib.ocaml_typing/typeclass.ml.html
Source file typeclass.ml
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(**************************************************************************) (* *) (* OCaml *) (* *) (* Jerome Vouillon, projet Cristal, INRIA Rocquencourt *) (* *) (* Copyright 1996 Institut National de Recherche en Informatique et *) (* en Automatique. *) (* *) (* All rights reserved. This file is distributed under the terms of *) (* the GNU Lesser General Public License version 2.1, with the *) (* special exception on linking described in the file LICENSE. *) (* *) (**************************************************************************) open Parsetree open Asttypes open Path open Types open Typecore open Typetexp type 'a class_info = { cls_id : Ident.t; cls_id_loc : string loc; cls_decl : class_declaration; cls_ty_id : Ident.t; cls_ty_decl : class_type_declaration; cls_obj_id : Ident.t; cls_obj_abbr : type_declaration; cls_abbr : type_declaration; cls_arity : int; cls_pub_methods : string list; cls_info : 'a; } type class_type_info = { clsty_ty_id : Ident.t; clsty_id_loc : string loc; clsty_ty_decl : class_type_declaration; clsty_obj_id : Ident.t; clsty_obj_abbr : type_declaration; clsty_abbr : type_declaration; clsty_info : Typedtree.class_type_declaration; } type 'a full_class = { id : Ident.t; id_loc : string loc; clty: class_declaration; ty_id: Ident.t; cltydef: class_type_declaration; obj_id: Ident.t; obj_abbr: type_declaration; arity: int; pub_meths: string list; coe: Warnings.loc list; req: 'a Typedtree.class_infos; } type kind = | Object | Class | Class_type type final = | Final | Not_final let kind_of_final = function | Final -> Object | Not_final -> Class type error = | Unconsistent_constraint of Errortrace.unification_error | Field_type_mismatch of string * string * Errortrace.unification_error | Unexpected_field of type_expr * string | Structure_expected of class_type | Cannot_apply of class_type | Apply_wrong_label of arg_label | Pattern_type_clash of type_expr | Repeated_parameter | Unbound_class_2 of Longident.t | Unbound_class_type_2 of Longident.t | Abbrev_type_clash of type_expr * type_expr * type_expr | Constructor_type_mismatch of string * Errortrace.unification_error | Virtual_class of kind * string list * string list | Undeclared_methods of kind * string list | Parameter_arity_mismatch of Longident.t * int * int | Parameter_mismatch of Errortrace.unification_error | Bad_parameters of Ident.t * type_expr list * type_expr list | Bad_class_type_parameters of Ident.t * type_expr list * type_expr list | Class_match_failure of Ctype.class_match_failure list | Unbound_val of string | Unbound_type_var of Format_doc.t * Ctype.closed_class_failure | Non_generalizable_class of { id : Ident.t ; clty : Types.class_declaration ; nongen_vars : type_expr list } | Cannot_coerce_self of type_expr | Non_collapsable_conjunction of Ident.t * Types.class_declaration * Errortrace.unification_error | Self_clash of Errortrace.unification_error | Mutability_mismatch of string * mutable_flag | No_overriding of string * string | Duplicate of string * string | Closing_self_type of class_signature exception Error of Location.t * Env.t * error exception Error_forward of Location.error open Typedtree let type_open_descr : (?used_slot:bool ref -> Env.t -> Parsetree.open_description -> open_description * Env.t) ref = ref (fun ?used_slot:_ _ -> assert false) let ctyp desc typ env loc = { ctyp_desc = desc; ctyp_type = typ; ctyp_loc = loc; ctyp_env = env; ctyp_attributes = [] } (* Path associated to the temporary class type of a class being typed (its constructor is not available). *) let unbound_class = Env.unbound_class (************************************) (* Some operations on class types *) (************************************) let extract_constraints cty = let sign = Btype.signature_of_class_type cty in (Btype.instance_vars sign, Btype.methods sign, Btype.concrete_methods sign) (* Record a class type *) let rc node = Cmt_format.add_saved_type (Cmt_format.Partial_class_expr node); node let update_class_signature loc env ~warn_implicit_public virt kind sign = let implicit_public, implicit_declared = Ctype.update_class_signature env sign in if implicit_declared <> [] then begin match virt with | Virtual -> () (* Should perhaps emit warning 17 here *) | Concrete -> raise (Error(loc, env, Undeclared_methods(kind, implicit_declared))) end; if warn_implicit_public && implicit_public <> [] then begin Location.prerr_warning loc (Warnings.Implicit_public_methods implicit_public) end let complete_class_signature loc env virt kind sign = update_class_signature loc env ~warn_implicit_public:false virt kind sign; Ctype.hide_private_methods env sign let complete_class_type loc env virt kind typ = let sign = Btype.signature_of_class_type typ in complete_class_signature loc env virt kind sign let check_virtual loc env virt kind sign = match virt with | Virtual -> () | Concrete -> match Btype.virtual_methods sign, Btype.virtual_instance_vars sign with | [], [] -> () | meths, vars -> raise(Error(loc, env, Virtual_class(kind, meths, vars))) let rec check_virtual_clty loc env virt kind clty = match clty with | Cty_constr(_, _, clty) | Cty_arrow(_, _, clty) -> check_virtual_clty loc env virt kind clty | Cty_signature sign -> check_virtual loc env virt kind sign (* Return the constructor type associated to a class type *) let rec constructor_type constr cty = match cty with Cty_constr (_, _, cty) -> constructor_type constr cty | Cty_signature _ -> constr | Cty_arrow (l, ty, cty) -> Ctype.newty (Tarrow (l, ty, constructor_type constr cty, commu_ok)) (***********************************) (* Primitives for typing classes *) (***********************************) let raise_add_method_failure loc env label sign failure = match (failure : Ctype.add_method_failure) with | Ctype.Unexpected_method -> raise(Error(loc, env, Unexpected_field (sign.Types.csig_self, label))) | Ctype.Type_mismatch trace -> raise(Error(loc, env, Field_type_mismatch ("method", label, trace))) let raise_add_instance_variable_failure loc env label failure = match (failure : Ctype.add_instance_variable_failure) with | Ctype.Mutability_mismatch mut -> raise (Error(loc, env, Mutability_mismatch(label, mut))) | Ctype.Type_mismatch trace -> raise (Error(loc, env, Field_type_mismatch("instance variable", label, trace))) let raise_inherit_class_signature_failure loc env sign = function | Ctype.Self_type_mismatch trace -> raise(Error(loc, env, Self_clash trace)) | Ctype.Method(label, failure) -> raise_add_method_failure loc env label sign failure | Ctype.Instance_variable(label, failure) -> raise_add_instance_variable_failure loc env label failure let add_method loc env label priv virt ty sign = match Ctype.add_method env label priv virt ty sign with | () -> () | exception Ctype.Add_method_failed failure -> raise_add_method_failure loc env label sign failure let add_instance_variable ~strict loc env label mut virt ty sign = match Ctype.add_instance_variable ~strict env label mut virt ty sign with | () -> () | exception Ctype.Add_instance_variable_failed failure -> raise_add_instance_variable_failure loc env label failure let inherit_class_signature ~strict loc env sign1 sign2 = match Ctype.inherit_class_signature ~strict env sign1 sign2 with | () -> () | exception Ctype.Inherit_class_signature_failed failure -> raise_inherit_class_signature_failure loc env sign1 failure let inherit_class_type ~strict loc env sign1 cty2 = let sign2 = match Btype.scrape_class_type cty2 with | Cty_signature sign2 -> sign2 | _ -> raise(Error(loc, env, Structure_expected cty2)) in inherit_class_signature ~strict loc env sign1 sign2 let unify_delayed_method_type loc env label ty expected_ty= match Ctype.unify env ty expected_ty with | () -> () | exception Ctype.Unify trace -> raise(Error(loc, env, Field_type_mismatch ("method", label, trace))) let type_constraint val_env sty sty' loc = let cty = transl_simple_type val_env ~closed:false sty in let ty = cty.ctyp_type in let cty' = transl_simple_type val_env ~closed:false sty' in let ty' = cty'.ctyp_type in begin try Ctype.unify val_env ty ty' with Ctype.Unify err -> raise(Error(loc, val_env, Unconsistent_constraint err)); end; (cty, cty') let make_method loc cl_num expr = let open Ast_helper in let mkid s = mkloc s loc in let pat = Pat.alias ~loc (Pat.var ~loc (mkid "self-*")) (mkid ("self-" ^ cl_num)) in Exp.function_ ~loc:expr.pexp_loc [ { pparam_desc = Pparam_val (Nolabel, None, pat); pparam_loc = pat.ppat_loc; } ] None (Pfunction_body expr) (*******************************) let delayed_meth_specs = ref [] let rec class_type_field env sign self_scope ctf = let loc = ctf.pctf_loc in let mkctf desc = { ctf_desc = desc; ctf_loc = loc; ctf_attributes = ctf.pctf_attributes } in let mkctf_with_attrs f = Builtin_attributes.warning_scope ctf.pctf_attributes (fun () -> mkctf (f ())) in match ctf.pctf_desc with | Pctf_inherit sparent -> mkctf_with_attrs (fun () -> let parent = class_type env Virtual self_scope sparent in complete_class_type parent.cltyp_loc env Virtual Class_type parent.cltyp_type; inherit_class_type ~strict:false loc env sign parent.cltyp_type; Tctf_inherit parent) | Pctf_val ({txt=lab}, mut, virt, sty) -> mkctf_with_attrs (fun () -> let cty = transl_simple_type env ~closed:false sty in let ty = cty.ctyp_type in add_instance_variable ~strict:false loc env lab mut virt ty sign; Tctf_val (lab, mut, virt, cty)) | Pctf_method ({txt=lab}, priv, virt, sty) -> mkctf_with_attrs (fun () -> let sty = Ast_helper.Typ.force_poly sty in match sty.ptyp_desc, priv with | Ptyp_poly ([],sty'), Public -> let expected_ty = Ctype.newvar () in add_method loc env lab priv virt expected_ty sign; let returned_cty = ctyp Ttyp_any (Ctype.newty Tnil) env loc in delayed_meth_specs := Warnings.mk_lazy (fun () -> let cty = transl_simple_type_univars env sty' in let ty = cty.ctyp_type in unify_delayed_method_type loc env lab ty expected_ty; returned_cty.ctyp_desc <- Ttyp_poly ([], cty); returned_cty.ctyp_type <- ty; ) :: !delayed_meth_specs; Tctf_method (lab, priv, virt, returned_cty) | _ -> let cty = transl_simple_type env ~closed:false sty in let ty = cty.ctyp_type in add_method loc env lab priv virt ty sign; Tctf_method (lab, priv, virt, cty)) | Pctf_constraint (sty, sty') -> mkctf_with_attrs (fun () -> let (cty, cty') = type_constraint env sty sty' ctf.pctf_loc in Tctf_constraint (cty, cty')) | Pctf_attribute x -> Builtin_attributes.warning_attribute x; mkctf (Tctf_attribute x) | Pctf_extension ext -> raise (Error_forward (Builtin_attributes.error_of_extension ext)) and class_signature virt env pcsig self_scope loc = let {pcsig_self=sty; pcsig_fields=psign} = pcsig in let sign = Ctype.new_class_signature () in (* Introduce a dummy method preventing self type from being closed. *) Ctype.add_dummy_method env ~scope:self_scope sign; let self_cty = transl_simple_type env ~closed:false sty in let self_type = self_cty.ctyp_type in begin try Ctype.unify env self_type sign.csig_self with Ctype.Unify _ -> raise(Error(sty.ptyp_loc, env, Pattern_type_clash self_type)) end; (* Class type fields *) let fields = Builtin_attributes.warning_scope [] (fun () -> List.map (class_type_field env sign self_scope) psign) in check_virtual loc env virt Class_type sign; { csig_self = self_cty; csig_fields = fields; csig_type = sign; } and class_type env virt self_scope scty = Builtin_attributes.warning_scope scty.pcty_attributes (fun () -> class_type_aux env virt self_scope scty) and class_type_aux env virt self_scope scty = let cltyp desc typ = { cltyp_desc = desc; cltyp_type = typ; cltyp_loc = scty.pcty_loc; cltyp_env = env; cltyp_attributes = scty.pcty_attributes; } in match scty.pcty_desc with | Pcty_constr (lid, styl) -> let (path, decl) = Env.lookup_cltype ~loc:scty.pcty_loc lid.txt env in if Path.same decl.clty_path unbound_class then raise(Error(scty.pcty_loc, env, Unbound_class_type_2 lid.txt)); let (params, clty) = Ctype.instance_class decl.clty_params decl.clty_type in (* Adding a dummy method to the self type prevents it from being closed / escaping. *) Ctype.add_dummy_method env ~scope:self_scope (Btype.signature_of_class_type clty); if List.length params <> List.length styl then raise(Error(scty.pcty_loc, env, Parameter_arity_mismatch (lid.txt, List.length params, List.length styl))); let ctys = List.map2 (fun sty ty -> let cty' = transl_simple_type env ~closed:false sty in let ty' = cty'.ctyp_type in begin try Ctype.unify env ty' ty with Ctype.Unify err -> raise(Error(sty.ptyp_loc, env, Parameter_mismatch err)) end; cty' ) styl params in let typ = Cty_constr (path, params, clty) in (* Check for unexpected virtual methods *) check_virtual_clty scty.pcty_loc env virt Class_type typ; cltyp (Tcty_constr ( path, lid , ctys)) typ | Pcty_signature pcsig -> let clsig = class_signature virt env pcsig self_scope scty.pcty_loc in let typ = Cty_signature clsig.csig_type in cltyp (Tcty_signature clsig) typ | Pcty_arrow (l, sty, scty) -> let cty = transl_simple_type env ~closed:false sty in let ty = cty.ctyp_type in let ty = if Btype.is_optional l then Ctype.newty (Tconstr(Predef.path_option,[ty], ref Mnil)) else ty in let clty = class_type env virt self_scope scty in let typ = Cty_arrow (l, ty, clty.cltyp_type) in cltyp (Tcty_arrow (l, cty, clty)) typ | Pcty_open (od, e) -> let (od, newenv) = !type_open_descr env od in let clty = class_type newenv virt self_scope e in cltyp (Tcty_open (od, clty)) clty.cltyp_type | Pcty_extension ext -> raise (Error_forward (Builtin_attributes.error_of_extension ext)) let class_type env virt self_scope scty = delayed_meth_specs := []; let cty = class_type env virt self_scope scty in List.iter Lazy.force (List.rev !delayed_meth_specs); delayed_meth_specs := []; cty (*******************************) let enter_ancestor_val name val_env = Env.enter_unbound_value name Val_unbound_ancestor val_env let enter_self_val name val_env = Env.enter_unbound_value name Val_unbound_self val_env let enter_instance_var_val name val_env = Env.enter_unbound_value name Val_unbound_instance_variable val_env let enter_ancestor_met ~loc name ~sign ~meths ~cl_num ~ty ~attrs met_env = let check s = Warnings.Unused_ancestor s in let kind = Val_anc (sign, meths, cl_num) in let desc = { val_type = ty; val_kind = kind; val_attributes = attrs; Types.val_loc = loc; val_uid = Uid.mk ~current_unit:(Env.get_current_unit ()) } in Env.enter_value ~check name desc met_env let add_self_met loc id sign self_var_kind vars cl_num as_var ty attrs met_env = let check = if as_var then (fun s -> Warnings.Unused_var s) else (fun s -> Warnings.Unused_var_strict s) in let kind = Val_self (sign, self_var_kind, vars, cl_num) in let desc = { val_type = ty; val_kind = kind; val_attributes = attrs; Types.val_loc = loc; val_uid = Uid.mk ~current_unit:(Env.get_current_unit ()) } in Env.add_value ~check id desc met_env let add_instance_var_met loc label id sign cl_num attrs met_env = let mut, ty = match Vars.find label sign.csig_vars with | (mut, _, ty) -> mut, ty | exception Not_found -> assert false in let kind = Val_ivar (mut, cl_num) in let desc = { val_type = ty; val_kind = kind; val_attributes = attrs; Types.val_loc = loc; val_uid = Uid.mk ~current_unit:(Env.get_current_unit ()) } in Env.add_value id desc met_env let add_instance_vars_met loc vars sign cl_num met_env = List.fold_left (fun met_env (label, id) -> add_instance_var_met loc label id sign cl_num [] met_env) met_env vars type intermediate_class_field = | Inherit of { override : override_flag; parent : class_expr; super : string option; inherited_vars : (string * Ident.t) list; super_meths : (string * Ident.t) list; loc : Location.t; attributes : attribute list; } | Virtual_val of { label : string loc; mut : mutable_flag; id : Ident.t; cty : core_type; already_declared : bool; loc : Location.t; attributes : attribute list; } | Concrete_val of { label : string loc; mut : mutable_flag; id : Ident.t; override : override_flag; definition : expression; already_declared : bool; loc : Location.t; attributes : attribute list; } | Virtual_method of { label : string loc; priv : private_flag; cty : core_type; loc : Location.t; attributes : attribute list; } | Concrete_method of { label : string loc; priv : private_flag; override : override_flag; sdefinition : Parsetree.expression; warning_state : Warnings.state; loc : Location.t; attributes : attribute list; } | Constraint of { cty1 : core_type; cty2 : core_type; loc : Location.t; attributes : attribute list; } | Initializer of { sexpr : Parsetree.expression; warning_state : Warnings.state; loc : Location.t; attributes : attribute list; } | Attribute of { attribute : attribute; loc : Location.t; attributes : attribute list; } type first_pass_accummulater = { rev_fields : intermediate_class_field list; val_env : Env.t; par_env : Env.t; concrete_meths : MethSet.t; concrete_vals : VarSet.t; local_meths : MethSet.t; local_vals : VarSet.t; vars : Ident.t Vars.t; } let rec class_field_first_pass self_loc cl_num sign self_scope acc cf = let { rev_fields; val_env; par_env; concrete_meths; concrete_vals; local_meths; local_vals; vars } = acc in let loc = cf.pcf_loc in let attributes = cf.pcf_attributes in let with_attrs f = Builtin_attributes.warning_scope attributes f in match cf.pcf_desc with | Pcf_inherit (override, sparent, super) -> with_attrs (fun () -> let parent = class_expr cl_num val_env par_env Virtual self_scope sparent in complete_class_type parent.cl_loc par_env Virtual Class parent.cl_type; inherit_class_type ~strict:true loc val_env sign parent.cl_type; let parent_sign = Btype.signature_of_class_type parent.cl_type in let new_concrete_meths = Btype.concrete_methods parent_sign in let new_concrete_vals = Btype.concrete_instance_vars parent_sign in let over_meths = MethSet.inter new_concrete_meths concrete_meths in let over_vals = VarSet.inter new_concrete_vals concrete_vals in begin match override with | Fresh -> let cname = match parent.cl_type with | Cty_constr (p, _, _) -> Path.name p | _ -> "inherited" in if not (MethSet.is_empty over_meths) then Location.prerr_warning loc (Warnings.Method_override (cname :: MethSet.elements over_meths)); if not (VarSet.is_empty over_vals) then Location.prerr_warning loc (Warnings.Instance_variable_override (cname :: VarSet.elements over_vals)); | Override -> if MethSet.is_empty over_meths && VarSet.is_empty over_vals then raise (Error(loc, val_env, No_overriding ("",""))) end; let concrete_vals = VarSet.union new_concrete_vals concrete_vals in let concrete_meths = MethSet.union new_concrete_meths concrete_meths in let val_env, par_env, inherited_vars, vars = Vars.fold (fun label _ (val_env, par_env, inherited_vars, vars) -> let val_env = enter_instance_var_val label val_env in let par_env = enter_instance_var_val label par_env in let id = Ident.create_local label in let inherited_vars = (label, id) :: inherited_vars in let vars = Vars.add label id vars in (val_env, par_env, inherited_vars, vars)) parent_sign.csig_vars (val_env, par_env, [], vars) in (* Methods available through super *) let super_meths = MethSet.fold (fun label acc -> (label, Ident.create_local label) :: acc) new_concrete_meths [] in (* Super *) let (val_env, par_env, super) = match super with | None -> (val_env, par_env, None) | Some {txt=name} -> let val_env = enter_ancestor_val name val_env in let par_env = enter_ancestor_val name par_env in (val_env, par_env, Some name) in let field = Inherit { override; parent; super; inherited_vars; super_meths; loc; attributes } in let rev_fields = field :: rev_fields in { acc with rev_fields; val_env; par_env; concrete_meths; concrete_vals; vars }) | Pcf_val (label, mut, Cfk_virtual styp) -> with_attrs (fun () -> let cty = Ctype.with_local_level_generalize_structure_if_principal (fun () -> Typetexp.transl_simple_type val_env ~closed:false styp) in add_instance_variable ~strict:true loc val_env label.txt mut Virtual cty.ctyp_type sign; let already_declared, val_env, par_env, id, vars = match Vars.find label.txt vars with | id -> true, val_env, par_env, id, vars | exception Not_found -> let name = label.txt in let val_env = enter_instance_var_val name val_env in let par_env = enter_instance_var_val name par_env in let id = Ident.create_local name in let vars = Vars.add label.txt id vars in false, val_env, par_env, id, vars in let field = Virtual_val { label; mut; id; cty; already_declared; loc; attributes } in let rev_fields = field :: rev_fields in { acc with rev_fields; val_env; par_env; vars }) | Pcf_val (label, mut, Cfk_concrete (override, sdefinition)) -> with_attrs (fun () -> if VarSet.mem label.txt local_vals then raise(Error(loc, val_env, Duplicate ("instance variable", label.txt))); if VarSet.mem label.txt concrete_vals then begin if override = Fresh then Location.prerr_warning label.loc (Warnings.Instance_variable_override[label.txt]) end else begin if override = Override then raise(Error(loc, val_env, No_overriding ("instance variable", label.txt))) end; let definition = Ctype.with_local_level_generalize_structure_if_principal (fun () -> type_exp val_env sdefinition) in add_instance_variable ~strict:true loc val_env label.txt mut Concrete definition.exp_type sign; let already_declared, val_env, par_env, id, vars = match Vars.find label.txt vars with | id -> true, val_env, par_env, id, vars | exception Not_found -> let name = label.txt in let val_env = enter_instance_var_val name val_env in let par_env = enter_instance_var_val name par_env in let id = Ident.create_local name in let vars = Vars.add label.txt id vars in false, val_env, par_env, id, vars in let field = Concrete_val { label; mut; id; override; definition; already_declared; loc; attributes } in let rev_fields = field :: rev_fields in let concrete_vals = VarSet.add label.txt concrete_vals in let local_vals = VarSet.add label.txt local_vals in { acc with rev_fields; val_env; par_env; concrete_vals; local_vals; vars }) | Pcf_method (label, priv, Cfk_virtual sty) -> with_attrs (fun () -> let sty = Ast_helper.Typ.force_poly sty in let cty = transl_simple_type val_env ~closed:false sty in let ty = cty.ctyp_type in add_method loc val_env label.txt priv Virtual ty sign; let field = Virtual_method { label; priv; cty; loc; attributes } in let rev_fields = field :: rev_fields in { acc with rev_fields }) | Pcf_method (label, priv, Cfk_concrete (override, expr)) -> with_attrs (fun () -> if MethSet.mem label.txt local_meths then raise(Error(loc, val_env, Duplicate ("method", label.txt))); if MethSet.mem label.txt concrete_meths then begin if override = Fresh then begin Location.prerr_warning loc (Warnings.Method_override [label.txt]) end end else begin if override = Override then begin raise(Error(loc, val_env, No_overriding("method", label.txt))) end end; let expr = match expr.pexp_desc with | Pexp_poly _ -> expr | _ -> Ast_helper.Exp.poly ~loc:expr.pexp_loc expr None in let sbody, sty = match expr.pexp_desc with | Pexp_poly (sbody, sty) -> sbody, sty | _ -> assert false in let ty = match sty with | None -> Ctype.newvar () | Some sty -> let sty = Ast_helper.Typ.force_poly sty in let cty' = Typetexp.transl_simple_type val_env ~closed:false sty in cty'.ctyp_type in add_method loc val_env label.txt priv Concrete ty sign; begin try match get_desc ty with | Tvar _ -> let ty' = Ctype.newvar () in Ctype.unify val_env (Ctype.newty (Tpoly (ty', []))) ty; Ctype.unify val_env (type_approx val_env sbody) ty' | Tpoly (ty1, tl) -> let _, ty1' = Ctype.instance_poly ~fixed:false tl ty1 in let ty2 = type_approx val_env sbody in Ctype.unify val_env ty2 ty1' | _ -> assert false with Ctype.Unify err -> raise(Error(loc, val_env, Field_type_mismatch ("method", label.txt, err))) end; let sdefinition = make_method self_loc cl_num expr in let warning_state = Warnings.backup () in let field = Concrete_method { label; priv; override; sdefinition; warning_state; loc; attributes } in let rev_fields = field :: rev_fields in let concrete_meths = MethSet.add label.txt concrete_meths in let local_meths = MethSet.add label.txt local_meths in { acc with rev_fields; concrete_meths; local_meths }) | Pcf_constraint (sty1, sty2) -> with_attrs (fun () -> let (cty1, cty2) = type_constraint val_env sty1 sty2 loc in let field = Constraint { cty1; cty2; loc; attributes } in let rev_fields = field :: rev_fields in { acc with rev_fields }) | Pcf_initializer sexpr -> with_attrs (fun () -> let sexpr = make_method self_loc cl_num sexpr in let warning_state = Warnings.backup () in let field = Initializer { sexpr; warning_state; loc; attributes } in let rev_fields = field :: rev_fields in { acc with rev_fields }) | Pcf_attribute attribute -> Builtin_attributes.warning_attribute attribute; let field = Attribute { attribute; loc; attributes } in let rev_fields = field :: rev_fields in { acc with rev_fields } | Pcf_extension ext -> raise (Error_forward (Builtin_attributes.error_of_extension ext)) and class_fields_first_pass self_loc cl_num sign self_scope val_env par_env cfs = let rev_fields = [] in let concrete_meths = MethSet.empty in let concrete_vals = VarSet.empty in let local_meths = MethSet.empty in let local_vals = VarSet.empty in let vars = Vars.empty in let init_acc = { rev_fields; val_env; par_env; concrete_meths; concrete_vals; local_meths; local_vals; vars } in let acc = Builtin_attributes.warning_scope [] (fun () -> List.fold_left (class_field_first_pass self_loc cl_num sign self_scope) init_acc cfs) in List.rev acc.rev_fields, acc.vars and class_field_second_pass cl_num sign met_env field = let mkcf desc loc attrs = { cf_desc = desc; cf_loc = loc; cf_attributes = attrs } in match field with | Inherit { override; parent; super; inherited_vars; super_meths; loc; attributes } -> let met_env = add_instance_vars_met loc inherited_vars sign cl_num met_env in let met_env = match super with | None -> met_env | Some name -> let meths = List.fold_left (fun acc (label, id) -> Meths.add label id acc) Meths.empty super_meths in let ty = Btype.self_type parent.cl_type in let attrs = [] in let _id, met_env = enter_ancestor_met ~loc name ~sign ~meths ~cl_num ~ty ~attrs met_env in met_env in let desc = Tcf_inherit(override, parent, super, inherited_vars, super_meths) in met_env, mkcf desc loc attributes | Virtual_val { label; mut; id; cty; already_declared; loc; attributes } -> let met_env = if already_declared then met_env else begin add_instance_var_met loc label.txt id sign cl_num attributes met_env end in let kind = Tcfk_virtual cty in let desc = Tcf_val(label, mut, id, kind, already_declared) in met_env, mkcf desc loc attributes | Concrete_val { label; mut; id; override; definition; already_declared; loc; attributes } -> let met_env = if already_declared then met_env else begin add_instance_var_met loc label.txt id sign cl_num attributes met_env end in let kind = Tcfk_concrete(override, definition) in let desc = Tcf_val(label, mut, id, kind, already_declared) in met_env, mkcf desc loc attributes | Virtual_method { label; priv; cty; loc; attributes } -> let kind = Tcfk_virtual cty in let desc = Tcf_method(label, priv, kind) in met_env, mkcf desc loc attributes | Concrete_method { label; priv; override; sdefinition; warning_state; loc; attributes } -> Warnings.with_state warning_state (fun () -> let ty = Btype.method_type label.txt sign in let self_type = sign.Types.csig_self in let meth_type = mk_expected (Btype.newgenty (Tarrow(Nolabel, self_type, ty, commu_ok))) in let texp = Ctype.with_raised_nongen_level (fun () -> type_expect met_env sdefinition meth_type) in let kind = Tcfk_concrete (override, texp) in let desc = Tcf_method(label, priv, kind) in met_env, mkcf desc loc attributes) | Constraint { cty1; cty2; loc; attributes } -> let desc = Tcf_constraint(cty1, cty2) in met_env, mkcf desc loc attributes | Initializer { sexpr; warning_state; loc; attributes } -> Warnings.with_state warning_state (fun () -> let unit_type = Ctype.instance Predef.type_unit in let self_type = sign.Types.csig_self in let meth_type = mk_expected (Ctype.newty (Tarrow (Nolabel, self_type, unit_type, commu_ok))) in let texp = Ctype.with_raised_nongen_level (fun () -> type_expect met_env sexpr meth_type) in let desc = Tcf_initializer texp in met_env, mkcf desc loc attributes) | Attribute { attribute; loc; attributes; } -> let desc = Tcf_attribute attribute in met_env, mkcf desc loc attributes and class_fields_second_pass cl_num sign met_env fields = let _, rev_cfs = List.fold_left (fun (met_env, cfs) field -> let met_env, cf = class_field_second_pass cl_num sign met_env field in met_env, cf :: cfs) (met_env, []) fields in List.rev rev_cfs (* N.B. the self type of a final object type doesn't contain a dummy method in the beginning. We only explicitly add a dummy method to class definitions (and class (type) declarations)), which are later removed (made absent) by [final_decl]. If we ever find a dummy method in a final object self type, it means that somehow we've unified the self type of the object with the self type of a not yet finished class. When this happens, we cannot close the object type and must error. *) and class_structure cl_num virt self_scope final val_env met_env loc { pcstr_self = spat; pcstr_fields = str } = (* Environment for substructures *) let par_env = met_env in (* Location of self. Used for locations of self arguments *) let self_loc = {spat.ppat_loc with Location.loc_ghost = true} in let sign = Ctype.new_class_signature () in (* Adding a dummy method to the signature prevents it from being closed / escaping. That isn't needed for objects though. *) begin match final with | Not_final -> Ctype.add_dummy_method val_env ~scope:self_scope sign; | Final -> () end; (* Self binder *) let (self_pat, self_pat_vars) = type_self_pattern val_env spat in let val_env, par_env = List.fold_right (fun {pv_id; _} (val_env, par_env) -> let name = Ident.name pv_id in let val_env = enter_self_val name val_env in let par_env = enter_self_val name par_env in val_env, par_env) self_pat_vars (val_env, par_env) in (* Check that the binder has a correct type *) begin try Ctype.unify val_env self_pat.pat_type sign.csig_self with Ctype.Unify _ -> raise(Error(spat.ppat_loc, val_env, Pattern_type_clash self_pat.pat_type)) end; (* Typing of class fields *) let (fields, vars) = class_fields_first_pass self_loc cl_num sign self_scope val_env par_env str in let kind = kind_of_final final in (* Check for unexpected virtual methods *) check_virtual loc val_env virt kind sign; (* Update the class signature *) update_class_signature loc val_env ~warn_implicit_public:false virt kind sign; let meths = Meths.fold (fun label _ meths -> Meths.add label (Ident.create_local label) meths) sign.csig_meths Meths.empty in (* Close the signature if it is final *) begin match final with | Not_final -> () | Final -> if not (Ctype.close_class_signature val_env sign) then raise(Error(loc, val_env, Closing_self_type sign)); end; (* Typing of method bodies *) Ctype.generalize_class_signature_spine sign; let self_var_kind = match virt with | Virtual -> Self_virtual(ref meths) | Concrete -> Self_concrete meths in let met_env = List.fold_right (fun {pv_id; pv_type; pv_loc; pv_kind; pv_attributes} met_env -> add_self_met pv_loc pv_id sign self_var_kind vars cl_num (pv_kind=As_var) pv_type pv_attributes met_env) self_pat_vars met_env in let fields = class_fields_second_pass cl_num sign met_env fields in (* Update the class signature and warn about public methods made private *) update_class_signature loc val_env ~warn_implicit_public:true virt kind sign; let meths = match self_var_kind with | Self_virtual meths_ref -> !meths_ref | Self_concrete meths -> meths in { cstr_self = self_pat; cstr_fields = fields; cstr_type = sign; cstr_meths = meths; } and class_expr cl_num val_env met_env virt self_scope scl = Builtin_attributes.warning_scope scl.pcl_attributes (fun () -> class_expr_aux cl_num val_env met_env virt self_scope scl) and class_expr_aux cl_num val_env met_env virt self_scope scl = match scl.pcl_desc with | Pcl_constr (lid, styl) -> let (path, decl) = Env.lookup_class ~loc:scl.pcl_loc lid.txt val_env in if Path.same decl.cty_path unbound_class then raise(Error(scl.pcl_loc, val_env, Unbound_class_2 lid.txt)); let tyl = List.map (fun sty -> transl_simple_type val_env ~closed:false sty) styl in let (params, clty) = Ctype.instance_class decl.cty_params decl.cty_type in let clty' = Btype.abbreviate_class_type path params clty in (* Adding a dummy method to the self type prevents it from being closed / escaping. *) Ctype.add_dummy_method val_env ~scope:self_scope (Btype.signature_of_class_type clty'); if List.length params <> List.length tyl then raise(Error(scl.pcl_loc, val_env, Parameter_arity_mismatch (lid.txt, List.length params, List.length tyl))); List.iter2 (fun cty' ty -> let ty' = cty'.ctyp_type in try Ctype.unify val_env ty' ty with Ctype.Unify err -> raise(Error(cty'.ctyp_loc, val_env, Parameter_mismatch err))) tyl params; (* Check for unexpected virtual methods *) check_virtual_clty scl.pcl_loc val_env virt Class clty'; let cl = rc {cl_desc = Tcl_ident (path, lid, tyl); cl_loc = scl.pcl_loc; cl_type = clty'; cl_env = val_env; cl_attributes = scl.pcl_attributes; } in let (vals, meths, concrs) = extract_constraints clty in rc {cl_desc = Tcl_constraint (cl, None, vals, meths, concrs); cl_loc = scl.pcl_loc; cl_type = clty'; cl_env = val_env; cl_attributes = []; (* attributes are kept on the inner cl node *) } | Pcl_structure cl_str -> let desc = class_structure cl_num virt self_scope Not_final val_env met_env scl.pcl_loc cl_str in rc {cl_desc = Tcl_structure desc; cl_loc = scl.pcl_loc; cl_type = Cty_signature desc.cstr_type; cl_env = val_env; cl_attributes = scl.pcl_attributes; } | Pcl_fun (l, Some default, spat, sbody) -> let loc = default.pexp_loc in let open Ast_helper in let scases = [ Exp.case (Pat.construct ~loc (mknoloc (Longident.(Ldot (Lident "*predef*", "Some")))) (Some ([], Pat.var ~loc (mknoloc "*sth*")))) (Exp.ident ~loc (mknoloc (Longident.Lident "*sth*"))); Exp.case (Pat.construct ~loc (mknoloc (Longident.(Ldot (Lident "*predef*", "None")))) None) default; ] in let smatch = Exp.match_ ~loc (Exp.ident ~loc (mknoloc (Longident.Lident "*opt*"))) scases in let sfun = Cl.fun_ ~loc:scl.pcl_loc l None (Pat.var ~loc (mknoloc "*opt*")) (Cl.let_ ~loc:scl.pcl_loc Nonrecursive [Vb.mk spat smatch] sbody) (* Note: we don't put the '#default' attribute, as it is not detected for class-level let bindings. See #5975.*) in class_expr cl_num val_env met_env virt self_scope sfun | Pcl_fun (l, None, spat, scl') -> let (pat, pv, val_env', met_env) = Ctype.with_local_level_generalize_structure_if_principal (fun () -> Typecore.type_class_arg_pattern cl_num val_env met_env l spat) in let pv = List.map begin fun (id, id', _ty) -> let path = Pident id' in (* do not mark the value as being used *) let vd = Env.find_value path val_env' in (id, {exp_desc = Texp_ident(path, mknoloc (Longident.Lident (Ident.name id)), vd); exp_loc = Location.none; exp_extra = []; exp_type = Ctype.instance vd.val_type; exp_attributes = []; (* check *) exp_env = val_env'}) end pv in let rec not_nolabel_function = function | Cty_arrow(Nolabel, _, _) -> false | Cty_arrow(_, _, cty) -> not_nolabel_function cty | _ -> true in let partial = let dummy = type_exp val_env (Ast_helper.Exp.unreachable ()) in Typecore.check_partial val_env pat.pat_type pat.pat_loc [{c_lhs = pat; c_cont = None; c_guard = None; c_rhs = dummy}] in let cl = Ctype.with_raised_nongen_level (fun () -> class_expr cl_num val_env' met_env virt self_scope scl') in if Btype.is_optional l && not_nolabel_function cl.cl_type then Location.prerr_warning pat.pat_loc Warnings.Unerasable_optional_argument; rc {cl_desc = Tcl_fun (l, pat, pv, cl, partial); cl_loc = scl.pcl_loc; cl_type = Cty_arrow (l, Ctype.instance pat.pat_type, cl.cl_type); cl_env = val_env; cl_attributes = scl.pcl_attributes; } | Pcl_apply (scl', sargs) -> assert (sargs <> []); let cl = Ctype.with_local_level_generalize_structure_if_principal (fun () -> class_expr cl_num val_env met_env virt self_scope scl') in let rec nonopt_labels ls ty_fun = match ty_fun with | Cty_arrow (l, _, ty_res) -> if Btype.is_optional l then nonopt_labels ls ty_res else nonopt_labels (l::ls) ty_res | _ -> ls in let ignore_labels = !Clflags.classic || let labels = nonopt_labels [] cl.cl_type in List.length labels = List.length sargs && List.for_all (fun (l,_) -> l = Nolabel) sargs && List.exists (fun l -> l <> Nolabel) labels && begin Location.prerr_warning cl.cl_loc (Warnings.Labels_omitted (List.map Asttypes.string_of_label (List.filter ((<>) Nolabel) labels))); true end in let rec type_args args omitted ty_fun ty_fun0 sargs = match ty_fun, ty_fun0 with | Cty_arrow (l, ty, ty_fun), Cty_arrow (_, ty0, ty_fun0) when sargs <> [] -> let name = Btype.label_name l and optional = Btype.is_optional l in let use_arg sarg l' = Some ( if not optional || Btype.is_optional l' then type_argument val_env sarg ty ty0 else let ty' = extract_option_type val_env ty and ty0' = extract_option_type val_env ty0 in let arg = type_argument val_env sarg ty' ty0' in option_some val_env arg ) in let eliminate_optional_arg () = Some (option_none val_env ty0 Location.none) in let remaining_sargs, arg = if ignore_labels then begin match sargs with | [] -> assert false | (l', sarg) :: remaining_sargs -> if name = Btype.label_name l' || (not optional && l' = Nolabel) then (remaining_sargs, use_arg sarg l') else if optional && not (List.exists (fun (l, _) -> name = Btype.label_name l) remaining_sargs) then (sargs, eliminate_optional_arg ()) else raise(Error(sarg.pexp_loc, val_env, Apply_wrong_label l')) end else match Btype.extract_label name sargs with | Some (l', sarg, _, remaining_sargs) -> if not optional && Btype.is_optional l' then Location.prerr_warning sarg.pexp_loc (Warnings.Nonoptional_label (Asttypes.string_of_label l)); remaining_sargs, use_arg sarg l' | None -> sargs, if Btype.is_optional l && List.mem_assoc Nolabel sargs then eliminate_optional_arg () else None in let omitted = if arg = None then (l,ty0) :: omitted else omitted in type_args ((l,arg)::args) omitted ty_fun ty_fun0 remaining_sargs | _ -> match sargs with (l, sarg0)::_ -> if omitted <> [] then raise(Error(sarg0.pexp_loc, val_env, Apply_wrong_label l)) else raise(Error(cl.cl_loc, val_env, Cannot_apply cl.cl_type)) | [] -> (List.rev args, List.fold_left (fun ty_fun (l,ty) -> Cty_arrow(l,ty,ty_fun)) ty_fun0 omitted) in let (args, cty) = let (_, ty_fun0) = Ctype.instance_class [] cl.cl_type in type_args [] [] cl.cl_type ty_fun0 sargs in rc {cl_desc = Tcl_apply (cl, args); cl_loc = scl.pcl_loc; cl_type = cty; cl_env = val_env; cl_attributes = scl.pcl_attributes; } | Pcl_let (rec_flag, sdefs, scl') -> let (defs, val_env) = Typecore.type_let In_class_def val_env rec_flag sdefs in let (vals, met_env) = List.fold_right (fun (id, _id_loc, _typ, _uid) (vals, met_env) -> let path = Pident id in (* do not mark the value as used *) let vd = Env.find_value path val_env in let ty = Ctype.with_local_level_generalize (fun () -> Ctype.instance vd.val_type) in let expr = {exp_desc = Texp_ident(path, mknoloc(Longident.Lident (Ident.name id)),vd); exp_loc = Location.none; exp_extra = []; exp_type = ty; exp_attributes = []; exp_env = val_env; } in let desc = {val_type = expr.exp_type; val_kind = Val_ivar (Immutable, cl_num); val_attributes = []; Types.val_loc = vd.Types.val_loc; val_uid = vd.val_uid; } in let id' = Ident.create_local (Ident.name id) in ((id', expr) :: vals, Env.add_value id' desc met_env)) (let_bound_idents_full defs) ([], met_env) in let cl = class_expr cl_num val_env met_env virt self_scope scl' in let defs = match rec_flag with | Recursive -> annotate_recursive_bindings val_env defs | Nonrecursive -> defs in rc {cl_desc = Tcl_let (rec_flag, defs, vals, cl); cl_loc = scl.pcl_loc; cl_type = cl.cl_type; cl_env = val_env; cl_attributes = scl.pcl_attributes; } | Pcl_constraint (scl', scty) -> let cl, clty = Ctype.with_local_level_for_class begin fun () -> let cl = Typetexp.TyVarEnv.with_local_scope begin fun () -> let cl = class_expr cl_num val_env met_env virt self_scope scl' in complete_class_type cl.cl_loc val_env virt Class_type cl.cl_type; cl end and clty = Typetexp.TyVarEnv.with_local_scope begin fun () -> let clty = class_type val_env virt self_scope scty in complete_class_type clty.cltyp_loc val_env virt Class clty.cltyp_type; clty end in cl, clty end ~post: begin fun ({cl_type=cl}, {cltyp_type=clty}) -> Ctype.limited_generalize_class_type (Btype.self_type_row cl) ~inside:cl; Ctype.limited_generalize_class_type (Btype.self_type_row clty) ~inside:clty; end in begin match Includeclass.class_types val_env cl.cl_type clty.cltyp_type with [] -> () | error -> raise(Error(cl.cl_loc, val_env, Class_match_failure error)) end; let (vals, meths, concrs) = extract_constraints clty.cltyp_type in let ty = snd (Ctype.instance_class [] clty.cltyp_type) in (* Adding a dummy method to the self type prevents it from being closed / escaping. *) Ctype.add_dummy_method val_env ~scope:self_scope (Btype.signature_of_class_type ty); rc {cl_desc = Tcl_constraint (cl, Some clty, vals, meths, concrs); cl_loc = scl.pcl_loc; cl_type = ty; cl_env = val_env; cl_attributes = scl.pcl_attributes; } | Pcl_open (pod, e) -> let used_slot = ref false in let (od, new_val_env) = !type_open_descr ~used_slot val_env pod in let ( _, new_met_env) = !type_open_descr ~used_slot met_env pod in let cl = class_expr cl_num new_val_env new_met_env virt self_scope e in rc {cl_desc = Tcl_open (od, cl); cl_loc = scl.pcl_loc; cl_type = cl.cl_type; cl_env = val_env; cl_attributes = scl.pcl_attributes; } | Pcl_extension ext -> raise (Error_forward (Builtin_attributes.error_of_extension ext)) (*******************************) (* Approximate the type of the constructor to allow recursive use *) (* of optional parameters *) let var_option = Predef.type_option (Btype.newgenvar ()) let rec approx_declaration cl = match cl.pcl_desc with Pcl_fun (l, _, _, cl) -> let arg = if Btype.is_optional l then Ctype.instance var_option else Ctype.newvar () in Ctype.newty (Tarrow (l, arg, approx_declaration cl, commu_ok)) | Pcl_let (_, _, cl) -> approx_declaration cl | Pcl_constraint (cl, _) -> approx_declaration cl | _ -> Ctype.newvar () let rec approx_description ct = match ct.pcty_desc with Pcty_arrow (l, _, ct) -> let arg = if Btype.is_optional l then Ctype.instance var_option else Ctype.newvar () in Ctype.newty (Tarrow (l, arg, approx_description ct, commu_ok)) | _ -> Ctype.newvar () (*******************************) let temp_abbrev loc arity uid = let params = ref [] in for _i = 1 to arity do params := Ctype.newvar () :: !params done; let ty = Ctype.newobj (Ctype.newvar ()) in let ty_td = {type_params = !params; type_arity = arity; type_kind = Type_abstract Definition; type_private = Public; type_manifest = Some ty; type_variance = Variance.unknown_signature ~injective:false ~arity; type_separability = Types.Separability.default_signature ~arity; type_is_newtype = false; type_expansion_scope = Btype.lowest_level; type_loc = loc; type_attributes = []; (* or keep attrs from the class decl? *) type_immediate = Unknown; type_unboxed_default = false; type_uid = uid; } in (!params, ty, ty_td) let initial_env define_class approx (res, env) (cl, id, ty_id, obj_id, uid) = (* Temporary abbreviations *) let arity = List.length cl.pci_params in let (obj_params, obj_ty, obj_td) = temp_abbrev cl.pci_loc arity uid in let env = Env.add_type ~check:true obj_id obj_td env in let (cl_params, cl_ty, cl_td) = temp_abbrev cl.pci_loc arity uid in (* Temporary type for the class constructor *) let constr_type = Ctype.with_local_level_generalize_structure_if_principal (fun () -> approx cl.pci_expr) in let dummy_cty = Cty_signature (Ctype.new_class_signature ()) in let dummy_class = {Types.cty_params = []; (* Dummy value *) cty_variance = []; cty_type = dummy_cty; (* Dummy value *) cty_path = unbound_class; cty_new = begin match cl.pci_virt with | Virtual -> None | Concrete -> Some constr_type end; cty_loc = Location.none; cty_attributes = []; cty_uid = uid; } in let env = Env.add_cltype ty_id {clty_params = []; (* Dummy value *) clty_variance = []; clty_type = dummy_cty; (* Dummy value *) clty_path = unbound_class; clty_hash_type = cl_td; (* Dummy value *) clty_loc = Location.none; clty_attributes = []; clty_uid = uid; } ( if define_class then Env.add_class id dummy_class env else env ) in ((cl, id, ty_id, obj_id, obj_params, obj_ty, cl_params, cl_ty, cl_td, constr_type, dummy_class)::res, env) let class_infos define_class kind (cl, id, ty_id, obj_id, obj_params, obj_ty, cl_params, cl_ty, cl_td, constr_type, dummy_class) (res, env) = let ci_params, params, coercion_locs, expr, typ, sign = Ctype.with_local_level_for_class begin fun () -> TyVarEnv.reset (); (* Introduce class parameters *) let ci_params = let make_param (sty, v) = try (transl_type_param env sty, v) with Already_bound -> raise(Error(sty.ptyp_loc, env, Repeated_parameter)) in List.map make_param cl.pci_params in let params = List.map (fun (cty, _) -> cty.ctyp_type) ci_params in (* Allow self coercions (only for class declarations) *) let coercion_locs = ref [] in (* Type the class expression *) let (expr, typ) = try Typecore.self_coercion := (Path.Pident obj_id, coercion_locs) :: !Typecore.self_coercion; let res = kind env cl.pci_virt cl.pci_expr in Typecore.self_coercion := List.tl !Typecore.self_coercion; res with exn -> Typecore.self_coercion := []; raise exn in let sign = Btype.signature_of_class_type typ in (ci_params, params, coercion_locs, expr, typ, sign) end ~post: begin fun (_, params, _, _, typ, sign) -> (* Generalize the row variable *) List.iter (fun inside -> Ctype.limited_generalize sign.csig_self_row ~inside) params; Ctype.limited_generalize_class_type sign.csig_self_row ~inside:typ; end in (* Check the abbreviation for the object type *) let (obj_params', obj_type) = Ctype.instance_class params typ in let constr = Ctype.newconstr (Path.Pident obj_id) obj_params in begin let row = Btype.self_type_row obj_type in Ctype.unify env row (Ctype.newty Tnil); begin try List.iter2 (Ctype.unify env) obj_params obj_params' with Ctype.Unify _ -> raise(Error(cl.pci_loc, env, Bad_parameters (obj_id, obj_params, obj_params'))) end; let ty = Btype.self_type obj_type in begin try Ctype.unify env ty constr with Ctype.Unify _ -> raise(Error(cl.pci_loc, env, Abbrev_type_clash (constr, ty, Ctype.expand_head env constr))) end end; Ctype.set_object_name obj_id params (Btype.self_type typ); (* Check the other temporary abbreviation (#-type) *) begin let (cl_params', cl_type) = Ctype.instance_class params typ in let ty = Btype.self_type cl_type in begin try List.iter2 (Ctype.unify env) cl_params cl_params' with Ctype.Unify _ -> raise(Error(cl.pci_loc, env, Bad_class_type_parameters (ty_id, cl_params, cl_params'))) end; begin try Ctype.unify env ty cl_ty with Ctype.Unify _ -> let ty_expanded = Ctype.object_fields ty in raise(Error(cl.pci_loc, env, Abbrev_type_clash (ty, ty_expanded, cl_ty))) end end; (* Type of the class constructor *) begin try Ctype.unify env (constructor_type constr obj_type) (Ctype.instance constr_type) with Ctype.Unify err -> raise(Error(cl.pci_loc, env, Constructor_type_mismatch (cl.pci_name.txt, err))) end; (* Class and class type temporary definitions *) let cty_variance = Variance.unknown_signature ~injective:false ~arity:(List.length params) in let cltydef = {clty_params = params; clty_type = Btype.class_body typ; clty_variance = cty_variance; clty_path = Path.Pident obj_id; clty_hash_type = cl_td; clty_loc = cl.pci_loc; clty_attributes = cl.pci_attributes; clty_uid = dummy_class.cty_uid; } and clty = {cty_params = params; cty_type = typ; cty_variance = cty_variance; cty_path = Path.Pident obj_id; cty_new = begin match cl.pci_virt with | Virtual -> None | Concrete -> Some constr_type end; cty_loc = cl.pci_loc; cty_attributes = cl.pci_attributes; cty_uid = dummy_class.cty_uid; } in dummy_class.cty_type <- typ; let env = Env.add_cltype ty_id cltydef ( if define_class then Env.add_class id clty env else env) in (* Misc. *) let arity = Btype.class_type_arity typ in let pub_meths = Btype.public_methods sign in (* Final definitions *) let (params', typ') = Ctype.instance_class params typ in let clty = {cty_params = params'; cty_type = typ'; cty_variance = cty_variance; cty_path = Path.Pident obj_id; cty_new = begin match cl.pci_virt with | Virtual -> None | Concrete -> Some (Ctype.instance constr_type) end; cty_loc = cl.pci_loc; cty_attributes = cl.pci_attributes; cty_uid = dummy_class.cty_uid; } in let obj_abbr = let arity = List.length obj_params in { type_params = obj_params; type_arity = arity; type_kind = Type_abstract Definition; type_private = Public; type_manifest = Some obj_ty; type_variance = Variance.unknown_signature ~injective:false ~arity; type_separability = Types.Separability.default_signature ~arity; type_is_newtype = false; type_expansion_scope = Btype.lowest_level; type_loc = cl.pci_loc; type_attributes = []; (* or keep attrs from cl? *) type_immediate = Unknown; type_unboxed_default = false; type_uid = dummy_class.cty_uid; } in let (cl_params, cl_ty) = Ctype.instance_parameterized_type params (Btype.self_type typ) in Ctype.set_object_name obj_id cl_params cl_ty; let cl_abbr = { cl_td with type_params = cl_params; type_manifest = Some cl_ty } in let cltydef = {clty_params = params'; clty_type = Btype.class_body typ'; clty_variance = cty_variance; clty_path = Path.Pident obj_id; clty_hash_type = cl_abbr; clty_loc = cl.pci_loc; clty_attributes = cl.pci_attributes; clty_uid = dummy_class.cty_uid; } in ((cl, id, clty, ty_id, cltydef, obj_id, obj_abbr, ci_params, arity, pub_meths, List.rev !coercion_locs, expr) :: res, env) let collapse_conj_class_params env (cl, id, clty, _, _, _, _, _, _, _, _, _) = try Ctype.collapse_conj_params env clty.cty_params with Ctype.Unify err -> raise(Error(cl.pci_loc, env, Non_collapsable_conjunction (id, clty, err))) let final_decl env define_class (cl, id, clty, ty_id, cltydef, obj_id, obj_abbr, ci_params, arity, pub_meths, coe, expr) = Ctype.nongen_vars_in_class_declaration clty |> Option.iter (fun vars -> let nongen_vars = Btype.TypeSet.elements vars in raise(Error(cl.pci_loc, env , Non_generalizable_class { id; clty; nongen_vars })); ); begin match Ctype.closed_class clty.cty_params (Btype.signature_of_class_type clty.cty_type) with None -> () | Some reason -> let printer = if define_class then Format_doc.doc_printf "%a" (Printtyp.Doc.class_declaration id) clty else Format_doc.doc_printf "%a" (Printtyp.Doc.cltype_declaration id) cltydef in raise(Error(cl.pci_loc, env, Unbound_type_var(printer, reason))) end; { id; clty; ty_id; cltydef; obj_id; obj_abbr; arity; pub_meths; coe; id_loc = cl.pci_name; req = { ci_loc = cl.pci_loc; ci_virt = cl.pci_virt; ci_params = ci_params; (* TODO : check that we have the correct use of identifiers *) ci_id_name = cl.pci_name; ci_id_class = id; ci_id_class_type = ty_id; ci_id_object = obj_id; ci_expr = expr; ci_decl = clty; ci_type_decl = cltydef; ci_attributes = cl.pci_attributes; } } (* (cl.pci_variance, cl.pci_loc)) *) let class_infos define_class kind (cl, id, ty_id, obj_id, obj_params, obj_ty, cl_params, cl_ty, cl_td, constr_type, dummy_class) (res, env) = Builtin_attributes.warning_scope cl.pci_attributes (fun () -> class_infos define_class kind (cl, id, ty_id, obj_id, obj_params, obj_ty, cl_params, cl_ty, cl_td, constr_type, dummy_class) (res, env) ) let extract_type_decls { clty; cltydef; obj_id; obj_abbr; req} decls = (obj_id, obj_abbr, clty, cltydef, req) :: decls let merge_type_decls decl (obj_abbr, clty, cltydef) = {decl with obj_abbr; clty; cltydef} let final_env define_class env { id; clty; ty_id; cltydef; obj_id; obj_abbr; } = (* Add definitions after cleaning them *) Env.add_type ~check:true obj_id (Subst.type_declaration Subst.identity obj_abbr) ( Env.add_cltype ty_id (Subst.cltype_declaration Subst.identity cltydef) ( if define_class then Env.add_class id (Subst.class_declaration Subst.identity clty) env else env)) (* Check that #c is coercible to c if there is a self-coercion *) let check_coercions env { id; id_loc; clty; ty_id; cltydef; obj_id; obj_abbr; arity; pub_meths; coe; req } = let cl_abbr = cltydef.clty_hash_type in begin match coe with [] -> () | loc :: _ -> let cl_ty, obj_ty = match cl_abbr.type_manifest, obj_abbr.type_manifest with Some cl_ab, Some obj_ab -> let cl_params, cl_ty = Ctype.instance_parameterized_type cl_abbr.type_params cl_ab and obj_params, obj_ty = Ctype.instance_parameterized_type obj_abbr.type_params obj_ab in List.iter2 (Ctype.unify env) cl_params obj_params; cl_ty, obj_ty | _ -> assert false in begin try Ctype.subtype env cl_ty obj_ty () with Ctype.Subtype err -> raise(Typecore.Error(loc, env, Typecore.Not_subtype err)) end; if not (Ctype.opened_object cl_ty) then raise(Error(loc, env, Cannot_coerce_self obj_ty)) end; {cls_id = id; cls_id_loc = id_loc; cls_decl = clty; cls_ty_id = ty_id; cls_ty_decl = cltydef; cls_obj_id = obj_id; cls_obj_abbr = obj_abbr; cls_abbr = cl_abbr; cls_arity = arity; cls_pub_methods = pub_meths; cls_info=req} (*******************************) let type_classes define_class approx kind env cls = let scope = Ctype.create_scope () in let cls = List.map (function cl -> (cl, Ident.create_scoped ~scope cl.pci_name.txt, Ident.create_scoped ~scope cl.pci_name.txt, Ident.create_scoped ~scope cl.pci_name.txt, Uid.mk ~current_unit:(Env.get_current_unit ()) )) cls in let res, newenv = Ctype.with_local_level_generalize_for_class begin fun () -> let (res, env) = List.fold_left (initial_env define_class approx) ([], env) cls in let (res, env) = List.fold_right (class_infos define_class kind) res ([], env) in List.iter (collapse_conj_class_params env) res; res, env end in let res = List.rev_map (final_decl newenv define_class) res in let decls = List.fold_right extract_type_decls res [] in let decls = try Typedecl_variance.update_class_decls newenv decls with Typedecl_variance.Error(loc, err) -> raise (Typedecl.Error(loc, Typedecl.Variance err)) in let res = List.map2 merge_type_decls res decls in let env = List.fold_left (final_env define_class) env res in let res = List.map (check_coercions env) res in (res, env) let class_num = ref 0 let class_declaration env virt sexpr = incr class_num; let self_scope = Ctype.get_current_level () in let expr = class_expr (Int.to_string !class_num) env env virt self_scope sexpr in complete_class_type expr.cl_loc env virt Class expr.cl_type; (expr, expr.cl_type) let class_description env virt sexpr = let self_scope = Ctype.get_current_level () in let expr = class_type env virt self_scope sexpr in complete_class_type expr.cltyp_loc env virt Class_type expr.cltyp_type; (expr, expr.cltyp_type) let class_declarations env cls = let info, env = type_classes true approx_declaration class_declaration env cls in let ids, exprs = List.split (List.map (fun ci -> ci.cls_id, ci.cls_info.ci_expr) info) in check_recursive_class_bindings env ids exprs; info, env let class_descriptions env cls = type_classes true approx_description class_description env cls let class_type_declarations env cls = let (decls, env) = type_classes false approx_description class_description env cls in (List.map (fun decl -> {clsty_ty_id = decl.cls_ty_id; clsty_id_loc = decl.cls_id_loc; clsty_ty_decl = decl.cls_ty_decl; clsty_obj_id = decl.cls_obj_id; clsty_obj_abbr = decl.cls_obj_abbr; clsty_abbr = decl.cls_abbr; clsty_info = decl.cls_info}) decls, env) let type_object env loc s = incr class_num; let desc = class_structure (Int.to_string !class_num) Concrete Btype.lowest_level Final env env loc s in complete_class_signature loc env Concrete Object desc.cstr_type; let meths = Btype.public_methods desc.cstr_type in (desc, meths) let () = Typecore.type_object := type_object (*******************************) (* Check that there is no references through recursive modules (GPR#6491) *) let rec check_recmod_class_type env cty = match cty.pcty_desc with | Pcty_constr(lid, _) -> ignore (Env.lookup_cltype ~use:false ~loc:lid.loc lid.txt env) | Pcty_extension _ -> () | Pcty_arrow(_, _, cty) -> check_recmod_class_type env cty | Pcty_open(od, cty) -> let _, env = !type_open_descr env od in check_recmod_class_type env cty | Pcty_signature csig -> check_recmod_class_sig env csig and check_recmod_class_sig env csig = List.iter (fun ctf -> match ctf.pctf_desc with | Pctf_inherit cty -> check_recmod_class_type env cty | Pctf_val _ | Pctf_method _ | Pctf_constraint _ | Pctf_attribute _ | Pctf_extension _ -> ()) csig.pcsig_fields let check_recmod_decl env sdecl = check_recmod_class_type env sdecl.pci_expr (* Approximate the class declaration as class ['params] id = object end *) let approx_class sdecl = let open Ast_helper in let self' = Typ.any () in let clty' = Cty.signature ~loc:sdecl.pci_expr.pcty_loc (Csig.mk self' []) in { sdecl with pci_expr = clty' } let approx_class_declarations env sdecls = let decls, env = class_type_declarations env (List.map approx_class sdecls) in List.iter (check_recmod_decl env) sdecls; decls, env (*******************************) (* Error report *) open Format_doc let non_virtual_string_of_kind : kind -> string = function | Object -> "object" | Class -> "non-virtual class" | Class_type -> "non-virtual class type" module Style=Misc.Style module Printtyp = Printtyp.Doc let out_type ppf t = Style.as_inline_code !Oprint.out_type ppf t let quoted_type ppf t = Style.as_inline_code Printtyp.type_expr ppf t let report_error_doc env ppf = let pp_args ppf args = let args = List.map (Out_type.tree_of_typexp Type) args in Style.as_inline_code !Oprint.out_type_args ppf args in function | Repeated_parameter -> fprintf ppf "A type parameter occurs several times" | Unconsistent_constraint err -> let msg = Format_doc.Doc.msg in fprintf ppf "@[<v>The class constraints are not consistent.@ "; Errortrace_report.unification ppf env err (msg "Type") (msg "is not compatible with type"); fprintf ppf "@]" | Field_type_mismatch (k, m, err) -> let msg = Format_doc.doc_printf in Errortrace_report.unification ppf env err (msg "The %s %a@ has type" k Style.inline_code m) (msg "but is expected to have type") | Unexpected_field (ty, lab) -> fprintf ppf "@[@[<2>This object is expected to have type :@ %a@]\ @ This type does not have a method %a." quoted_type ty Style.inline_code lab | Structure_expected clty -> fprintf ppf "@[This class expression is not a class structure; it has type@ %a@]" (Style.as_inline_code Printtyp.class_type) clty | Cannot_apply _ -> fprintf ppf "This class expression is not a class function, it cannot be applied" | Apply_wrong_label l -> let mark_label ppf = function | Nolabel -> fprintf ppf "without label" | l -> fprintf ppf "with label %a" Style.inline_code (Btype.prefixed_label_name l) in fprintf ppf "This argument cannot be applied %a" mark_label l | Pattern_type_clash ty -> (* XXX Trace *) (* XXX Revoir message d'erreur | Improve error message *) fprintf ppf "@[%s@ %a@]" "This pattern cannot match self: it only matches values of type" quoted_type ty | Unbound_class_2 cl -> fprintf ppf "@[The class@ %a@ is not yet completely defined@]" (Style.as_inline_code Printtyp.longident) cl | Unbound_class_type_2 cl -> fprintf ppf "@[The class type@ %a@ is not yet completely defined@]" (Style.as_inline_code Printtyp.longident) cl | Abbrev_type_clash (abbrev, actual, expected) -> (* XXX Afficher une trace ? | Print a trace? *) Out_type.prepare_for_printing [abbrev; actual; expected]; fprintf ppf "@[The abbreviation@ %a@ expands to type@ %a@ \ but is used with type@ %a@]" out_type (Out_type.tree_of_typexp Type abbrev) out_type (Out_type.tree_of_typexp Type actual) out_type (Out_type.tree_of_typexp Type expected) | Constructor_type_mismatch (c, err) -> let msg = Format_doc.doc_printf in Errortrace_report.unification ppf env err (msg "The expression %a has type" Style.inline_code ("new " ^ c) ) (msg "but is used with type") | Virtual_class (kind, mets, vals) -> let kind = non_virtual_string_of_kind kind in let missings = match mets, vals with [], _ -> "variables" | _, [] -> "methods" | _ -> "methods and variables" in fprintf ppf "@[This %s has virtual %s.@ \ @[<2>The following %s are virtual : %a@]@]" kind missings missings (pp_print_list ~pp_sep:pp_print_space Style.inline_code) (mets @ vals) | Undeclared_methods(kind, mets) -> let kind = non_virtual_string_of_kind kind in fprintf ppf "@[This %s has undeclared virtual methods.@ \ @[<2>The following methods were not declared : %a@]@]" kind (pp_print_list ~pp_sep:pp_print_space Style.inline_code) mets | Parameter_arity_mismatch(lid, expected, provided) -> fprintf ppf "@[The class constructor %a@ expects %i type argument(s),@ \ but is here applied to %i type argument(s)@]" (Style.as_inline_code Printtyp.longident) lid expected provided | Parameter_mismatch err -> let msg = Format_doc.Doc.msg in Errortrace_report.unification ppf env err (msg "The type parameter") (msg "does not meet its constraint: it should be") | Bad_parameters (id, params, cstrs) -> Out_type.prepare_for_printing (params @ cstrs); fprintf ppf "@[The abbreviation %a@ is used with parameter(s)@ %a@ \ which are incompatible with constraint(s)@ %a@]" (Style.as_inline_code Printtyp.ident) id pp_args params pp_args cstrs | Bad_class_type_parameters (id, params, cstrs) -> let pp_hash ppf id = fprintf ppf "#%a" Printtyp.ident id in Out_type.prepare_for_printing (params @ cstrs); fprintf ppf "@[The class type %a@ is used with parameter(s)@ %a,@ \ whereas the class type definition@ constrains@ \ those parameters to be@ %a@]" (Style.as_inline_code pp_hash) id pp_args params pp_args cstrs | Class_match_failure error -> Includeclass.report_error_doc Type ppf error | Unbound_val lab -> fprintf ppf "Unbound instance variable %a" Style.inline_code lab | Unbound_type_var (msg, reason) -> let print_reason ppf { Ctype.free_variable; meth; meth_ty; } = let (ty0, kind) = free_variable in let ty1 = match kind with | Type_variable -> ty0 | Row_variable -> Btype.newgenty(Tobject(ty0, ref None)) in Out_type.add_type_to_preparation meth_ty; Out_type.add_type_to_preparation ty1; fprintf ppf "The method %a@ has type@;<1 2>%a@ where@ %a@ is unbound" Style.inline_code meth out_type (Out_type.tree_of_typexp Type meth_ty) out_type (Out_type.tree_of_typexp Type ty0) in fprintf ppf "@[<v>@[Some type variables are unbound in this type:@;<1 2>%a@]@ \ @[%a@]@]" pp_doc msg print_reason reason | Non_generalizable_class {id; clty; nongen_vars } -> let[@manual.ref "ss:valuerestriction"] manual_ref = [ 6; 1; 2] in Out_type.prepare_for_printing nongen_vars; fprintf ppf "@[The type of this class,@ %a,@ \ contains the non-generalizable type variable(s): %a.@ %a@]" (Style.as_inline_code @@ Printtyp.class_declaration id) clty (pp_print_list ~pp_sep:(fun f () -> fprintf f ",@ ") (Style.as_inline_code Out_type.prepared_type_scheme) ) nongen_vars Misc.print_see_manual manual_ref | Cannot_coerce_self ty -> fprintf ppf "@[The type of self cannot be coerced to@ \ the type of the current class:@ %a.@.\ Some occurrences are contravariant@]" (Style.as_inline_code Printtyp.type_scheme) ty | Non_collapsable_conjunction (id, clty, err) -> let msg = Format_doc.Doc.msg in fprintf ppf "@[The type of this class,@ %a,@ \ contains non-collapsible conjunctive types in constraints.@ %t@]" (Style.as_inline_code @@ Printtyp.class_declaration id) clty (fun ppf -> Errortrace_report.unification ppf env err (msg "Type") (msg "is not compatible with type") ) | Self_clash err -> let msg = Format_doc.Doc.msg in Errortrace_report.unification ppf env err (msg "This object is expected to have type") (msg "but actually has type") | Mutability_mismatch (_lab, mut) -> let mut1, mut2 = if mut = Immutable then "mutable", "immutable" else "immutable", "mutable" in fprintf ppf "@[The instance variable is %s;@ it cannot be redefined as %s@]" mut1 mut2 | No_overriding (_, "") -> fprintf ppf "@[This inheritance does not override any methods@ \ or instance variables@ but is explicitly marked as@ \ overriding with %a.@]" Style.inline_code "!" | No_overriding (kind, name) -> fprintf ppf "@[The %s %a@ has no previous definition@]" kind Style.inline_code name | Duplicate (kind, name) -> fprintf ppf "@[The %s %a@ has multiple definitions in this object@]" kind Style.inline_code name | Closing_self_type sign -> fprintf ppf "@[Cannot close type of object literal:@ %a@,\ it has been unified with the self type of a class that is not yet@ \ completely defined.@]" (Style.as_inline_code Printtyp.type_scheme) sign.csig_self let report_error_doc env ppf err = Printtyp.wrap_printing_env ~error:true env (fun () -> report_error_doc env ppf err) let () = Location.register_error_of_exn (function | Error (loc, env, err) -> Some (Location.error_of_printer ~loc (report_error_doc env) err) | Error_forward err -> Some err | _ -> None ) let report_error = Format_doc.compat1 report_error_doc
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