1604 lines
56 KiB
OCaml
1604 lines
56 KiB
OCaml
(***********************************************************************)
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(* *)
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(* Objective Caml *)
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(* *)
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(* Jerome Vouillon, projet Cristal, INRIA Rocquencourt *)
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(* *)
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(* Copyright 1996 Institut National de Recherche en Informatique et *)
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(* en Automatique. All rights reserved. This file is distributed *)
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(* under the terms of the Q Public License version 1.0. *)
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(* *)
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(***********************************************************************)
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(* $Id$ *)
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open Misc
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open Parsetree
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open Asttypes
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open Path
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open Types
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open Typedtree
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open Typecore
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open Typetexp
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open Format
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type error =
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Unconsistent_constraint of (type_expr * type_expr) list
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| Field_type_mismatch of string * string * (type_expr * type_expr) list
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| Structure_expected of class_type
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| Cannot_apply of class_type
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| Apply_wrong_label of label
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| Pattern_type_clash of type_expr
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| Repeated_parameter
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| Unbound_class_2 of Longident.t
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| Unbound_class_type_2 of Longident.t
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| Abbrev_type_clash of type_expr * type_expr * type_expr
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| Constructor_type_mismatch of string * (type_expr * type_expr) list
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| Virtual_class of bool * string list * string list
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| Parameter_arity_mismatch of Longident.t * int * int
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| Parameter_mismatch of (type_expr * type_expr) list
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| Bad_parameters of Ident.t * type_expr * type_expr
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| Class_match_failure of Ctype.class_match_failure list
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| Unbound_val of string
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| Unbound_type_var of (formatter -> unit) * Ctype.closed_class_failure
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| Make_nongen_seltype of type_expr
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| Non_generalizable_class of Ident.t * Types.class_declaration
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| Cannot_coerce_self of type_expr
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| Non_collapsable_conjunction of
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Ident.t * Types.class_declaration * (type_expr * type_expr) list
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| Final_self_clash of (type_expr * type_expr) list
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| Mutability_mismatch of string * mutable_flag
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| No_overriding of string * string
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exception Error of Location.t * error
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(**********************)
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(* Useful constants *)
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(**********************)
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(*
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Self type have a dummy private method, thus preventing it to become
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closed.
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*)
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let dummy_method = Ctype.dummy_method
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(*
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Path associated to the temporary class type of a class being typed
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(its constructor is not available).
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*)
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let unbound_class = Path.Pident (Ident.create "")
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(************************************)
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(* Some operations on class types *)
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(************************************)
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(* Fully expand the head of a class type *)
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let rec scrape_class_type =
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function
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Tcty_constr (_, _, cty) -> scrape_class_type cty
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| cty -> cty
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(* Generalize a class type *)
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let rec generalize_class_type =
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function
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Tcty_constr (_, params, cty) ->
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List.iter Ctype.generalize params;
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generalize_class_type cty
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| Tcty_signature {cty_self = sty; cty_vars = vars; cty_inher = inher} ->
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Ctype.generalize sty;
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Vars.iter (fun _ (_, _, ty) -> Ctype.generalize ty) vars;
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List.iter (fun (_,tl) -> List.iter Ctype.generalize tl) inher
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| Tcty_fun (_, ty, cty) ->
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Ctype.generalize ty;
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generalize_class_type cty
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(* Return the virtual methods of a class type *)
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let virtual_methods sign =
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let (fields, _) = Ctype.flatten_fields (Ctype.object_fields sign.cty_self) in
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List.fold_left
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(fun virt (lab, _, _) ->
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if lab = dummy_method then virt else
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if Concr.mem lab sign.cty_concr then virt else
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lab::virt)
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[] fields
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(* Return the constructor type associated to a class type *)
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let rec constructor_type constr cty =
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match cty with
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Tcty_constr (_, _, cty) ->
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constructor_type constr cty
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| Tcty_signature sign ->
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constr
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| Tcty_fun (l, ty, cty) ->
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Ctype.newty (Tarrow (l, ty, constructor_type constr cty, Cok))
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let rec class_body cty =
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match cty with
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Tcty_constr (_, _, cty') ->
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cty (* Only class bodies can be abbreviated *)
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| Tcty_signature sign ->
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cty
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| Tcty_fun (_, ty, cty) ->
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class_body cty
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let rec extract_constraints cty =
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let sign = Ctype.signature_of_class_type cty in
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(Vars.fold (fun lab _ vars -> lab :: vars) sign.cty_vars [],
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begin let (fields, _) =
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Ctype.flatten_fields (Ctype.object_fields sign.cty_self)
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in
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List.fold_left
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(fun meths (lab, _, _) ->
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if lab = dummy_method then meths else lab::meths)
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[] fields
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end,
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sign.cty_concr)
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let rec abbreviate_class_type path params cty =
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match cty with
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Tcty_constr (_, _, _) | Tcty_signature _ ->
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Tcty_constr (path, params, cty)
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| Tcty_fun (l, ty, cty) ->
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Tcty_fun (l, ty, abbreviate_class_type path params cty)
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let rec closed_class_type =
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function
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Tcty_constr (_, params, _) ->
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List.for_all Ctype.closed_schema params
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| Tcty_signature sign ->
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Ctype.closed_schema sign.cty_self
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&&
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Vars.fold (fun _ (_, _, ty) cc -> Ctype.closed_schema ty && cc)
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sign.cty_vars
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true
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| Tcty_fun (_, ty, cty) ->
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Ctype.closed_schema ty
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&&
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closed_class_type cty
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let closed_class cty =
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List.for_all Ctype.closed_schema cty.cty_params
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&&
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closed_class_type cty.cty_type
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let rec limited_generalize rv =
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function
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Tcty_constr (path, params, cty) ->
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List.iter (Ctype.limited_generalize rv) params;
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limited_generalize rv cty
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| Tcty_signature sign ->
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Ctype.limited_generalize rv sign.cty_self;
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Vars.iter (fun _ (_, _, ty) -> Ctype.limited_generalize rv ty)
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sign.cty_vars;
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List.iter (fun (_, tl) -> List.iter (Ctype.limited_generalize rv) tl)
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sign.cty_inher
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| Tcty_fun (_, ty, cty) ->
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Ctype.limited_generalize rv ty;
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limited_generalize rv cty
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(* Record a class type *)
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let rc node =
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Stypes.record (Stypes.Ti_class node);
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node
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(***********************************)
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(* Primitives for typing classes *)
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(***********************************)
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(* Enter a value in the method environment only *)
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let enter_met_env lab kind ty val_env met_env par_env =
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let (id, val_env) =
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Env.enter_value lab {val_type = ty; val_kind = Val_unbound} val_env
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in
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(id, val_env,
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Env.add_value id {val_type = ty; val_kind = kind} met_env,
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Env.add_value id {val_type = ty; val_kind = Val_unbound} par_env)
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(* Enter an instance variable in the environment *)
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let enter_val cl_num vars inh lab mut virt ty val_env met_env par_env loc =
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let (id, virt) =
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try
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let (id, mut', virt', ty') = Vars.find lab !vars in
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if mut' <> mut then raise (Error(loc, Mutability_mismatch(lab, mut)));
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Ctype.unify val_env (Ctype.instance ty) (Ctype.instance ty');
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(if not inh then Some id else None),
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(if virt' = Concrete then virt' else virt)
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with
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Ctype.Unify tr ->
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raise (Error(loc, Field_type_mismatch("instance variable", lab, tr)))
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| Not_found -> None, virt
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in
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let (id, _, _, _) as result =
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match id with Some id -> (id, val_env, met_env, par_env)
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| None ->
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enter_met_env lab (Val_ivar (mut, cl_num)) ty val_env met_env par_env
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in
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vars := Vars.add lab (id, mut, virt, ty) !vars;
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result
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let concr_vals vars =
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Vars.fold
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(fun id (_, vf, _) s -> if vf = Virtual then s else Concr.add id s)
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vars Concr.empty
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let inheritance self_type env ovf concr_meths warn_vals loc parent =
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match scrape_class_type parent with
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Tcty_signature cl_sig ->
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(* Methods *)
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begin try
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Ctype.unify env self_type cl_sig.cty_self
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with Ctype.Unify trace ->
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match trace with
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_::_::_::({desc = Tfield(n, _, _, _)}, _)::rem ->
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raise(Error(loc, Field_type_mismatch ("method", n, rem)))
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| _ ->
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assert false
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end;
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(* Overriding *)
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let over_meths = Concr.inter cl_sig.cty_concr concr_meths in
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let concr_vals = concr_vals cl_sig.cty_vars in
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let over_vals = Concr.inter concr_vals warn_vals in
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begin match ovf with
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Some Fresh ->
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let cname =
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match parent with
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Tcty_constr (p, _, _) -> Path.name p
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| _ -> "inherited"
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in
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if not (Concr.is_empty over_meths) then
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Location.prerr_warning loc
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(Warnings.Method_override (cname :: Concr.elements over_meths));
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if not (Concr.is_empty over_vals) then
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Location.prerr_warning loc
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(Warnings.Instance_variable_override
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(cname :: Concr.elements over_vals));
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| Some Override
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when Concr.is_empty over_meths && Concr.is_empty over_vals ->
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raise (Error(loc, No_overriding ("","")))
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| _ -> ()
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end;
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let concr_meths = Concr.union cl_sig.cty_concr concr_meths
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and warn_vals = Concr.union concr_vals warn_vals in
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(cl_sig, concr_meths, warn_vals)
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| _ ->
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raise(Error(loc, Structure_expected parent))
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let virtual_method val_env meths self_type lab priv sty loc =
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let (_, ty') =
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Ctype.filter_self_method val_env lab priv meths self_type
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in
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let ty = transl_simple_type val_env false sty in
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try Ctype.unify val_env ty ty' with Ctype.Unify trace ->
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raise(Error(loc, Field_type_mismatch ("method", lab, trace)))
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let delayed_meth_specs = ref []
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let declare_method val_env meths self_type lab priv sty loc =
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let (_, ty') =
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Ctype.filter_self_method val_env lab priv meths self_type
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in
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let unif ty =
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try Ctype.unify val_env ty ty' with Ctype.Unify trace ->
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raise(Error(loc, Field_type_mismatch ("method", lab, trace)))
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in
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match sty.ptyp_desc, priv with
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Ptyp_poly ([],sty), Public ->
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delayed_meth_specs :=
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lazy (unif (transl_simple_type_univars val_env sty)) ::
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!delayed_meth_specs
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| _ -> unif (transl_simple_type val_env false sty)
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let type_constraint val_env sty sty' loc =
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let ty = transl_simple_type val_env false sty in
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let ty' = transl_simple_type val_env false sty' in
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try Ctype.unify val_env ty ty' with Ctype.Unify trace ->
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raise(Error(loc, Unconsistent_constraint trace))
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let mkpat d = { ppat_desc = d; ppat_loc = Location.none }
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let make_method cl_num expr =
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{ pexp_desc =
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Pexp_function ("", None,
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[mkpat (Ppat_alias (mkpat(Ppat_var "self-*"),
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"self-" ^ cl_num)),
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expr]);
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pexp_loc = expr.pexp_loc }
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(*******************************)
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let add_val env loc lab (mut, virt, ty) val_sig =
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let virt =
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try
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let (mut', virt', ty') = Vars.find lab val_sig in
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if virt' = Concrete then virt' else virt
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with Not_found -> virt
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in
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Vars.add lab (mut, virt, ty) val_sig
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let rec class_type_field env self_type meths (val_sig, concr_meths, inher) =
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function
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Pctf_inher sparent ->
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let parent = class_type env sparent in
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let inher =
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match parent with
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Tcty_constr (p, tl, _) -> (p, tl) :: inher
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| _ -> inher
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in
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let (cl_sig, concr_meths, _) =
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inheritance self_type env None concr_meths Concr.empty sparent.pcty_loc
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parent
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in
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let val_sig =
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Vars.fold (add_val env sparent.pcty_loc) cl_sig.cty_vars val_sig in
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(val_sig, concr_meths, inher)
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| Pctf_val (lab, mut, virt, sty, loc) ->
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let ty = transl_simple_type env false sty in
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(add_val env loc lab (mut, virt, ty) val_sig, concr_meths, inher)
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| Pctf_virt (lab, priv, sty, loc) ->
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declare_method env meths self_type lab priv sty loc;
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(val_sig, concr_meths, inher)
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| Pctf_meth (lab, priv, sty, loc) ->
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declare_method env meths self_type lab priv sty loc;
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(val_sig, Concr.add lab concr_meths, inher)
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| Pctf_cstr (sty, sty', loc) ->
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type_constraint env sty sty' loc;
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(val_sig, concr_meths, inher)
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and class_signature env sty sign =
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let meths = ref Meths.empty in
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let self_type = transl_simple_type env false sty in
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(* Check that the binder is a correct type, and introduce a dummy
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method preventing self type from being closed. *)
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let dummy_obj = Ctype.newvar () in
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Ctype.unify env (Ctype.filter_method env dummy_method Private dummy_obj)
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(Ctype.newty (Ttuple []));
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begin try
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Ctype.unify env self_type dummy_obj
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with Ctype.Unify _ ->
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raise(Error(sty.ptyp_loc, Pattern_type_clash self_type))
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end;
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(* Class type fields *)
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let (val_sig, concr_meths, inher) =
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List.fold_left (class_type_field env self_type meths)
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(Vars.empty, Concr.empty, [])
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sign
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in
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{cty_self = self_type;
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cty_vars = val_sig;
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cty_concr = concr_meths;
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cty_inher = inher}
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and class_type env scty =
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match scty.pcty_desc with
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Pcty_constr (lid, styl) ->
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let (path, decl) = Typetexp.find_cltype env scty.pcty_loc lid in
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if Path.same decl.clty_path unbound_class then
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raise(Error(scty.pcty_loc, Unbound_class_type_2 lid));
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let (params, clty) =
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Ctype.instance_class decl.clty_params decl.clty_type
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in
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if List.length params <> List.length styl then
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raise(Error(scty.pcty_loc,
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Parameter_arity_mismatch (lid, List.length params,
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List.length styl)));
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List.iter2
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(fun sty ty ->
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let ty' = transl_simple_type env false sty in
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try Ctype.unify env ty' ty with Ctype.Unify trace ->
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raise(Error(sty.ptyp_loc, Parameter_mismatch trace)))
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styl params;
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Tcty_constr (path, params, clty)
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| Pcty_signature (sty, sign) ->
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Tcty_signature (class_signature env sty sign)
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| Pcty_fun (l, sty, scty) ->
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let ty = transl_simple_type env false sty in
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let cty = class_type env scty in
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Tcty_fun (l, ty, cty)
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let class_type env scty =
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delayed_meth_specs := [];
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let cty = class_type env scty in
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List.iter Lazy.force (List.rev !delayed_meth_specs);
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delayed_meth_specs := [];
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cty
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(*******************************)
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let rec class_field cl_num self_type meths vars
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(val_env, met_env, par_env, fields, concr_meths, warn_vals, inher) =
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function
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Pcf_inher (ovf, sparent, super) ->
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let parent = class_expr cl_num val_env par_env sparent in
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let inher =
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match parent.cl_type with
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Tcty_constr (p, tl, _) -> (p, tl) :: inher
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| _ -> inher
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in
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let (cl_sig, concr_meths, warn_vals) =
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inheritance self_type val_env (Some ovf) concr_meths warn_vals
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sparent.pcl_loc parent.cl_type
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in
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(* Variables *)
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let (val_env, met_env, par_env, inh_vars) =
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Vars.fold
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(fun lab info (val_env, met_env, par_env, inh_vars) ->
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let mut, vr, ty = info in
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let (id, val_env, met_env, par_env) =
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enter_val cl_num vars true lab mut vr ty val_env met_env par_env
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sparent.pcl_loc
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in
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(val_env, met_env, par_env, (lab, id) :: inh_vars))
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cl_sig.cty_vars (val_env, met_env, par_env, [])
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in
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(* Inherited concrete methods *)
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let inh_meths =
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Concr.fold (fun lab rem -> (lab, Ident.create lab)::rem)
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cl_sig.cty_concr []
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in
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(* Super *)
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let (val_env, met_env, par_env) =
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match super with
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None ->
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(val_env, met_env, par_env)
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| Some name ->
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let (id, val_env, met_env, par_env) =
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enter_met_env name (Val_anc (inh_meths, cl_num)) self_type
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val_env met_env par_env
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in
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(val_env, met_env, par_env)
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in
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(val_env, met_env, par_env,
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lazy(Cf_inher (parent, inh_vars, inh_meths))::fields,
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concr_meths, warn_vals, inher)
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|
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| Pcf_valvirt (lab, mut, styp, loc) ->
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if !Clflags.principal then Ctype.begin_def ();
|
|
let ty = Typetexp.transl_simple_type val_env false styp in
|
|
if !Clflags.principal then begin
|
|
Ctype.end_def ();
|
|
Ctype.generalize_structure ty
|
|
end;
|
|
let (id, val_env, met_env', par_env) =
|
|
enter_val cl_num vars false lab mut Virtual ty
|
|
val_env met_env par_env loc
|
|
in
|
|
(val_env, met_env', par_env,
|
|
lazy(Cf_val (lab, id, None, met_env' == met_env)) :: fields,
|
|
concr_meths, warn_vals, inher)
|
|
|
|
| Pcf_val (lab, mut, ovf, sexp, loc) ->
|
|
if Concr.mem lab warn_vals then begin
|
|
if ovf = Fresh then
|
|
Location.prerr_warning loc (Warnings.Instance_variable_override[lab])
|
|
end else begin
|
|
if ovf = Override then
|
|
raise(Error(loc, No_overriding ("instance variable", lab)))
|
|
end;
|
|
if !Clflags.principal then Ctype.begin_def ();
|
|
let exp =
|
|
try type_exp val_env sexp with Ctype.Unify [(ty, _)] ->
|
|
raise(Error(loc, Make_nongen_seltype ty))
|
|
in
|
|
if !Clflags.principal then begin
|
|
Ctype.end_def ();
|
|
Ctype.generalize_structure exp.exp_type
|
|
end;
|
|
let (id, val_env, met_env', par_env) =
|
|
enter_val cl_num vars false lab mut Concrete exp.exp_type
|
|
val_env met_env par_env loc
|
|
in
|
|
(val_env, met_env', par_env,
|
|
lazy(Cf_val (lab, id, Some exp, met_env' == met_env)) :: fields,
|
|
concr_meths, Concr.add lab warn_vals, inher)
|
|
|
|
| Pcf_virt (lab, priv, sty, loc) ->
|
|
virtual_method val_env meths self_type lab priv sty loc;
|
|
(val_env, met_env, par_env, fields, concr_meths, warn_vals, inher)
|
|
|
|
| Pcf_meth (lab, priv, ovf, expr, loc) ->
|
|
if Concr.mem lab concr_meths then begin
|
|
if ovf = Fresh then
|
|
Location.prerr_warning loc (Warnings.Method_override [lab])
|
|
end else begin
|
|
if ovf = Override then raise(Error(loc, No_overriding("method", lab)))
|
|
end;
|
|
let (_, ty) =
|
|
Ctype.filter_self_method val_env lab priv meths self_type
|
|
in
|
|
begin try match expr.pexp_desc with
|
|
Pexp_poly (sbody, sty) ->
|
|
begin match sty with None -> ()
|
|
| Some sty ->
|
|
Ctype.unify val_env
|
|
(Typetexp.transl_simple_type val_env false sty) ty
|
|
end;
|
|
begin match (Ctype.repr ty).desc 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 false tl ty1 in
|
|
let ty2 = type_approx val_env sbody in
|
|
Ctype.unify val_env ty2 ty1'
|
|
| _ -> assert false
|
|
end
|
|
| _ -> assert false
|
|
with Ctype.Unify trace ->
|
|
raise(Error(loc, Field_type_mismatch ("method", lab, trace)))
|
|
end;
|
|
let meth_expr = make_method cl_num expr in
|
|
(* backup variables for Pexp_override *)
|
|
let vars_local = !vars in
|
|
|
|
let field =
|
|
lazy begin
|
|
let meth_type =
|
|
Ctype.newty (Tarrow("", self_type, Ctype.instance ty, Cok)) in
|
|
Ctype.raise_nongen_level ();
|
|
vars := vars_local;
|
|
let texp = type_expect met_env meth_expr meth_type in
|
|
Ctype.end_def ();
|
|
Cf_meth (lab, texp)
|
|
end in
|
|
(val_env, met_env, par_env, field::fields,
|
|
Concr.add lab concr_meths, warn_vals, inher)
|
|
|
|
| Pcf_cstr (sty, sty', loc) ->
|
|
type_constraint val_env sty sty' loc;
|
|
(val_env, met_env, par_env, fields, concr_meths, warn_vals, inher)
|
|
|
|
| Pcf_let (rec_flag, sdefs, loc) ->
|
|
let (defs, val_env) =
|
|
try
|
|
Typecore.type_let val_env rec_flag sdefs None
|
|
with Ctype.Unify [(ty, _)] ->
|
|
raise(Error(loc, Make_nongen_seltype ty))
|
|
in
|
|
let (vals, met_env, par_env) =
|
|
List.fold_right
|
|
(fun id (vals, met_env, par_env) ->
|
|
let expr =
|
|
Typecore.type_exp val_env
|
|
{pexp_desc = Pexp_ident (Longident.Lident (Ident.name id));
|
|
pexp_loc = Location.none}
|
|
in
|
|
let desc =
|
|
{val_type = expr.exp_type;
|
|
val_kind = Val_ivar (Immutable, cl_num)}
|
|
in
|
|
let id' = Ident.create (Ident.name id) in
|
|
((id', expr)
|
|
:: vals,
|
|
Env.add_value id' desc met_env,
|
|
Env.add_value id' desc par_env))
|
|
(let_bound_idents defs)
|
|
([], met_env, par_env)
|
|
in
|
|
(val_env, met_env, par_env, lazy(Cf_let(rec_flag, defs, vals))::fields,
|
|
concr_meths, warn_vals, inher)
|
|
|
|
| Pcf_init expr ->
|
|
let expr = make_method cl_num expr in
|
|
let vars_local = !vars in
|
|
let field =
|
|
lazy begin
|
|
Ctype.raise_nongen_level ();
|
|
let meth_type =
|
|
Ctype.newty
|
|
(Tarrow ("", self_type, Ctype.instance Predef.type_unit, Cok)) in
|
|
vars := vars_local;
|
|
let texp = type_expect met_env expr meth_type in
|
|
Ctype.end_def ();
|
|
Cf_init texp
|
|
end in
|
|
(val_env, met_env, par_env, field::fields, concr_meths, warn_vals, inher)
|
|
|
|
and class_structure cl_num final val_env met_env loc (spat, str) =
|
|
(* Environment for substructures *)
|
|
let par_env = met_env in
|
|
|
|
(* Self type, with a dummy method preventing it from being closed/escaped. *)
|
|
let self_type = Ctype.newvar () in
|
|
Ctype.unify val_env
|
|
(Ctype.filter_method val_env dummy_method Private self_type)
|
|
(Ctype.newty (Ttuple []));
|
|
|
|
(* Private self is used for private method calls *)
|
|
let private_self = if final then Ctype.newvar () else self_type in
|
|
|
|
(* Self binder *)
|
|
let (pat, meths, vars, val_env, meth_env, par_env) =
|
|
type_self_pattern cl_num private_self val_env met_env par_env spat
|
|
in
|
|
let public_self = pat.pat_type in
|
|
|
|
(* Check that the binder has a correct type *)
|
|
let ty =
|
|
if final then Ctype.newty (Tobject (Ctype.newvar(), ref None))
|
|
else self_type in
|
|
begin try Ctype.unify val_env public_self ty with
|
|
Ctype.Unify _ ->
|
|
raise(Error(spat.ppat_loc, Pattern_type_clash public_self))
|
|
end;
|
|
let get_methods ty =
|
|
(fst (Ctype.flatten_fields
|
|
(Ctype.object_fields (Ctype.expand_head val_env ty)))) in
|
|
if final then begin
|
|
(* Copy known information to still empty self_type *)
|
|
List.iter
|
|
(fun (lab,kind,ty) ->
|
|
let k =
|
|
if Btype.field_kind_repr kind = Fpresent then Public else Private in
|
|
try Ctype.unify val_env ty
|
|
(Ctype.filter_method val_env lab k self_type)
|
|
with _ -> assert false)
|
|
(get_methods public_self)
|
|
end;
|
|
|
|
(* Typing of class fields *)
|
|
let (_, _, _, fields, concr_meths, _, inher) =
|
|
List.fold_left (class_field cl_num self_type meths vars)
|
|
(val_env, meth_env, par_env, [], Concr.empty, Concr.empty, [])
|
|
str
|
|
in
|
|
Ctype.unify val_env self_type (Ctype.newvar ());
|
|
let sign =
|
|
{cty_self = public_self;
|
|
cty_vars = Vars.map (fun (id, mut, vr, ty) -> (mut, vr, ty)) !vars;
|
|
cty_concr = concr_meths;
|
|
cty_inher = inher} in
|
|
let methods = get_methods self_type in
|
|
let priv_meths =
|
|
List.filter (fun (_,kind,_) -> Btype.field_kind_repr kind <> Fpresent)
|
|
methods in
|
|
if final then begin
|
|
(* Unify private_self and a copy of self_type. self_type will not
|
|
be modified after this point *)
|
|
Ctype.close_object self_type;
|
|
let mets = virtual_methods {sign with cty_self = self_type} in
|
|
let vals =
|
|
Vars.fold
|
|
(fun name (mut, vr, ty) l -> if vr = Virtual then name :: l else l)
|
|
sign.cty_vars [] in
|
|
if mets <> [] || vals <> [] then
|
|
raise(Error(loc, Virtual_class(true, mets, vals)));
|
|
let self_methods =
|
|
List.fold_right
|
|
(fun (lab,kind,ty) rem ->
|
|
if lab = dummy_method then
|
|
(* allow public self and private self to be unified *)
|
|
match Btype.field_kind_repr kind with
|
|
Fvar r -> Btype.set_kind r Fabsent; rem
|
|
| _ -> rem
|
|
else
|
|
Ctype.newty(Tfield(lab, Btype.copy_kind kind, ty, rem)))
|
|
methods (Ctype.newty Tnil) in
|
|
begin try
|
|
Ctype.unify val_env private_self
|
|
(Ctype.newty (Tobject(self_methods, ref None)));
|
|
Ctype.unify val_env public_self self_type
|
|
with Ctype.Unify trace -> raise(Error(loc, Final_self_clash trace))
|
|
end;
|
|
end;
|
|
|
|
(* Typing of method bodies *)
|
|
if !Clflags.principal then
|
|
List.iter (fun (_,_,ty) -> Ctype.generalize_spine ty) methods;
|
|
let fields = List.map Lazy.force (List.rev fields) in
|
|
if !Clflags.principal then
|
|
List.iter (fun (_,_,ty) -> Ctype.unify val_env ty (Ctype.newvar ()))
|
|
methods;
|
|
let meths = Meths.map (function (id, ty) -> id) !meths in
|
|
|
|
(* Check for private methods made public *)
|
|
let pub_meths' =
|
|
List.filter (fun (_,kind,_) -> Btype.field_kind_repr kind = Fpresent)
|
|
(get_methods public_self) in
|
|
let names = List.map (fun (x,_,_) -> x) in
|
|
let l1 = names priv_meths and l2 = names pub_meths' in
|
|
let added = List.filter (fun x -> List.mem x l1) l2 in
|
|
if added <> [] then
|
|
Location.prerr_warning loc (Warnings.Implicit_public_methods added);
|
|
{cl_field = fields; cl_meths = meths}, sign
|
|
|
|
and class_expr cl_num val_env met_env scl =
|
|
match scl.pcl_desc with
|
|
Pcl_constr (lid, styl) ->
|
|
let (path, decl) = Typetexp.find_class val_env scl.pcl_loc lid in
|
|
if Path.same decl.cty_path unbound_class then
|
|
raise(Error(scl.pcl_loc, Unbound_class_2 lid));
|
|
let tyl = List.map
|
|
(fun sty -> transl_simple_type val_env false sty, sty.ptyp_loc)
|
|
styl
|
|
in
|
|
let (params, clty) =
|
|
Ctype.instance_class decl.cty_params decl.cty_type
|
|
in
|
|
let clty' = abbreviate_class_type path params clty in
|
|
if List.length params <> List.length tyl then
|
|
raise(Error(scl.pcl_loc,
|
|
Parameter_arity_mismatch (lid, List.length params,
|
|
List.length tyl)));
|
|
List.iter2
|
|
(fun (ty',loc) ty ->
|
|
try Ctype.unify val_env ty' ty with Ctype.Unify trace ->
|
|
raise(Error(loc, Parameter_mismatch trace)))
|
|
tyl params;
|
|
let cl =
|
|
rc {cl_desc = Tclass_ident path;
|
|
cl_loc = scl.pcl_loc;
|
|
cl_type = clty';
|
|
cl_env = val_env}
|
|
in
|
|
let (vals, meths, concrs) = extract_constraints clty in
|
|
rc {cl_desc = Tclass_constraint (cl, vals, meths, concrs);
|
|
cl_loc = scl.pcl_loc;
|
|
cl_type = clty';
|
|
cl_env = val_env}
|
|
| Pcl_structure cl_str ->
|
|
let (desc, ty) =
|
|
class_structure cl_num false val_env met_env scl.pcl_loc cl_str in
|
|
rc {cl_desc = Tclass_structure desc;
|
|
cl_loc = scl.pcl_loc;
|
|
cl_type = Tcty_signature ty;
|
|
cl_env = val_env}
|
|
| Pcl_fun (l, Some default, spat, sbody) ->
|
|
let loc = default.pexp_loc in
|
|
let scases =
|
|
[{ppat_loc = loc; ppat_desc =
|
|
Ppat_construct(Longident.(Ldot (Lident"*predef*", "Some")),
|
|
Some{ppat_loc = loc; ppat_desc = Ppat_var"*sth*"},
|
|
false)},
|
|
{pexp_loc = loc; pexp_desc = Pexp_ident(Longident.Lident"*sth*")};
|
|
{ppat_loc = loc; ppat_desc =
|
|
Ppat_construct(Longident.(Ldot (Lident"*predef*", "None")),
|
|
None, false)},
|
|
default] in
|
|
let smatch =
|
|
{pexp_loc = loc; pexp_desc =
|
|
Pexp_match({pexp_loc = loc; pexp_desc =
|
|
Pexp_ident(Longident.Lident"*opt*")},
|
|
scases)} in
|
|
let sfun =
|
|
{pcl_loc = scl.pcl_loc; pcl_desc =
|
|
Pcl_fun(l, None, {ppat_loc = loc; ppat_desc = Ppat_var"*opt*"},
|
|
{pcl_loc = scl.pcl_loc; pcl_desc =
|
|
Pcl_let(Default, [spat, smatch], sbody)})}
|
|
in
|
|
class_expr cl_num val_env met_env sfun
|
|
| Pcl_fun (l, None, spat, scl') ->
|
|
if !Clflags.principal then Ctype.begin_def ();
|
|
let (pat, pv, val_env', met_env) =
|
|
Typecore.type_class_arg_pattern cl_num val_env met_env l spat
|
|
in
|
|
if !Clflags.principal then begin
|
|
Ctype.end_def ();
|
|
iter_pattern (fun {pat_type=ty} -> Ctype.generalize_structure ty) pat
|
|
end;
|
|
let pv =
|
|
List.map
|
|
(function (id, id', ty) ->
|
|
(id,
|
|
Typecore.type_exp val_env'
|
|
{pexp_desc = Pexp_ident (Longident.Lident (Ident.name id));
|
|
pexp_loc = Location.none}))
|
|
pv
|
|
in
|
|
let rec not_function = function
|
|
Tcty_fun _ -> false
|
|
| _ -> true
|
|
in
|
|
let partial =
|
|
Parmatch.check_partial pat.pat_loc
|
|
[pat, (* Dummy expression *)
|
|
{exp_desc = Texp_constant (Asttypes.Const_int 1);
|
|
exp_loc = Location.none;
|
|
exp_type = Ctype.none;
|
|
exp_env = Env.empty }] in
|
|
Ctype.raise_nongen_level ();
|
|
let cl = class_expr cl_num val_env' met_env scl' in
|
|
Ctype.end_def ();
|
|
if Btype.is_optional l && not_function cl.cl_type then
|
|
Location.prerr_warning pat.pat_loc
|
|
Warnings.Unerasable_optional_argument;
|
|
rc {cl_desc = Tclass_fun (pat, pv, cl, partial);
|
|
cl_loc = scl.pcl_loc;
|
|
cl_type = Tcty_fun (l, Ctype.instance pat.pat_type, cl.cl_type);
|
|
cl_env = val_env}
|
|
| Pcl_apply (scl', sargs) ->
|
|
let cl = class_expr cl_num val_env met_env scl' in
|
|
let rec nonopt_labels ls ty_fun =
|
|
match ty_fun with
|
|
| Tcty_fun (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 = "") sargs &&
|
|
List.exists (fun l -> l <> "") labels &&
|
|
begin
|
|
Location.prerr_warning cl.cl_loc Warnings.Labels_omitted;
|
|
true
|
|
end
|
|
in
|
|
let rec type_args args omitted ty_fun sargs more_sargs =
|
|
match ty_fun with
|
|
| Tcty_fun (l, ty, ty_fun) when sargs <> [] || more_sargs <> [] ->
|
|
let name = Btype.label_name l
|
|
and optional =
|
|
if Btype.is_optional l then Optional else Required in
|
|
let sargs, more_sargs, arg =
|
|
if ignore_labels && not (Btype.is_optional l) then begin
|
|
match sargs, more_sargs with
|
|
(l', sarg0)::_, _ ->
|
|
raise(Error(sarg0.pexp_loc, Apply_wrong_label(l')))
|
|
| _, (l', sarg0)::more_sargs ->
|
|
if l <> l' && l' <> "" then
|
|
raise(Error(sarg0.pexp_loc, Apply_wrong_label l'))
|
|
else ([], more_sargs, Some(type_argument val_env sarg0 ty))
|
|
| _ ->
|
|
assert false
|
|
end else try
|
|
let (l', sarg0, sargs, more_sargs) =
|
|
try
|
|
let (l', sarg0, sargs1, sargs2) =
|
|
Btype.extract_label name sargs
|
|
in (l', sarg0, sargs1 @ sargs2, more_sargs)
|
|
with Not_found ->
|
|
let (l', sarg0, sargs1, sargs2) =
|
|
Btype.extract_label name more_sargs
|
|
in (l', sarg0, sargs @ sargs1, sargs2)
|
|
in
|
|
sargs, more_sargs,
|
|
if Btype.is_optional l' || not (Btype.is_optional l) then
|
|
Some (type_argument val_env sarg0 ty)
|
|
else
|
|
let arg = type_argument val_env
|
|
sarg0 (extract_option_type val_env ty) in
|
|
Some (option_some arg)
|
|
with Not_found ->
|
|
sargs, more_sargs,
|
|
if Btype.is_optional l &&
|
|
(List.mem_assoc "" sargs || List.mem_assoc "" more_sargs)
|
|
then
|
|
Some (option_none ty Location.none)
|
|
else None
|
|
in
|
|
let omitted = if arg = None then (l,ty) :: omitted else omitted in
|
|
type_args ((arg,optional)::args) omitted ty_fun sargs more_sargs
|
|
| _ ->
|
|
match sargs @ more_sargs with
|
|
(l, sarg0)::_ ->
|
|
if omitted <> [] then
|
|
raise(Error(sarg0.pexp_loc, Apply_wrong_label l))
|
|
else
|
|
raise(Error(cl.cl_loc, Cannot_apply cl.cl_type))
|
|
| [] ->
|
|
(List.rev args,
|
|
List.fold_left
|
|
(fun ty_fun (l,ty) -> Tcty_fun(l,ty,ty_fun))
|
|
ty_fun omitted)
|
|
in
|
|
let (args, cty) =
|
|
if ignore_labels then
|
|
type_args [] [] cl.cl_type [] sargs
|
|
else
|
|
type_args [] [] cl.cl_type sargs []
|
|
in
|
|
rc {cl_desc = Tclass_apply (cl, args);
|
|
cl_loc = scl.pcl_loc;
|
|
cl_type = cty;
|
|
cl_env = val_env}
|
|
| Pcl_let (rec_flag, sdefs, scl') ->
|
|
let (defs, val_env) =
|
|
try
|
|
Typecore.type_let val_env rec_flag sdefs None
|
|
with Ctype.Unify [(ty, _)] ->
|
|
raise(Error(scl.pcl_loc, Make_nongen_seltype ty))
|
|
in
|
|
let (vals, met_env) =
|
|
List.fold_right
|
|
(fun id (vals, met_env) ->
|
|
Ctype.begin_def ();
|
|
let expr =
|
|
Typecore.type_exp val_env
|
|
{pexp_desc = Pexp_ident (Longident.Lident (Ident.name id));
|
|
pexp_loc = Location.none}
|
|
in
|
|
Ctype.end_def ();
|
|
Ctype.generalize expr.exp_type;
|
|
let desc =
|
|
{val_type = expr.exp_type; val_kind = Val_ivar (Immutable,
|
|
cl_num)}
|
|
in
|
|
let id' = Ident.create (Ident.name id) in
|
|
((id', expr)
|
|
:: vals,
|
|
Env.add_value id' desc met_env))
|
|
(let_bound_idents defs)
|
|
([], met_env)
|
|
in
|
|
let cl = class_expr cl_num val_env met_env scl' in
|
|
rc {cl_desc = Tclass_let (rec_flag, defs, vals, cl);
|
|
cl_loc = scl.pcl_loc;
|
|
cl_type = cl.cl_type;
|
|
cl_env = val_env}
|
|
| Pcl_constraint (scl', scty) ->
|
|
Ctype.begin_class_def ();
|
|
let context = Typetexp.narrow () in
|
|
let cl = class_expr cl_num val_env met_env scl' in
|
|
Typetexp.widen context;
|
|
let context = Typetexp.narrow () in
|
|
let clty = class_type val_env scty in
|
|
Typetexp.widen context;
|
|
Ctype.end_def ();
|
|
|
|
limited_generalize (Ctype.row_variable (Ctype.self_type cl.cl_type))
|
|
cl.cl_type;
|
|
limited_generalize (Ctype.row_variable (Ctype.self_type clty)) clty;
|
|
|
|
begin match Includeclass.class_types val_env cl.cl_type clty with
|
|
[] -> ()
|
|
| error -> raise(Error(cl.cl_loc, Class_match_failure error))
|
|
end;
|
|
let (vals, meths, concrs) = extract_constraints clty in
|
|
rc {cl_desc = Tclass_constraint (cl, vals, meths, concrs);
|
|
cl_loc = scl.pcl_loc;
|
|
cl_type = snd (Ctype.instance_class [] clty);
|
|
cl_env = val_env}
|
|
|
|
(*******************************)
|
|
|
|
(* 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, Cok))
|
|
| 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_fun (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, Cok))
|
|
| _ -> Ctype.newvar ()
|
|
|
|
(*******************************)
|
|
|
|
let temp_abbrev env id arity =
|
|
let params = ref [] in
|
|
for i = 1 to arity do
|
|
params := Ctype.newvar () :: !params
|
|
done;
|
|
let ty = Ctype.newobj (Ctype.newvar ()) in
|
|
let env =
|
|
Env.add_type id
|
|
{type_params = !params;
|
|
type_arity = arity;
|
|
type_kind = Type_abstract;
|
|
type_private = Public;
|
|
type_manifest = Some ty;
|
|
type_variance = List.map (fun _ -> true, true, true) !params}
|
|
env
|
|
in
|
|
(!params, ty, env)
|
|
|
|
let rec initial_env define_class approx
|
|
(res, env) (cl, id, ty_id, obj_id, cl_id) =
|
|
(* Temporary abbreviations *)
|
|
let arity = List.length (fst cl.pci_params) in
|
|
let (obj_params, obj_ty, env) = temp_abbrev env obj_id arity in
|
|
let (cl_params, cl_ty, env) = temp_abbrev env cl_id arity in
|
|
|
|
(* Temporary type for the class constructor *)
|
|
let constr_type = approx cl.pci_expr in
|
|
if !Clflags.principal then Ctype.generalize_spine constr_type;
|
|
let dummy_cty =
|
|
Tcty_signature
|
|
{ cty_self = Ctype.newvar ();
|
|
cty_vars = Vars.empty;
|
|
cty_concr = Concr.empty;
|
|
cty_inher = [] }
|
|
in
|
|
let dummy_class =
|
|
{cty_params = []; (* Dummy value *)
|
|
cty_variance = [];
|
|
cty_type = dummy_cty; (* Dummy value *)
|
|
cty_path = unbound_class;
|
|
cty_new =
|
|
match cl.pci_virt with
|
|
Virtual -> None
|
|
| Concrete -> Some constr_type}
|
|
in
|
|
let env =
|
|
Env.add_cltype ty_id
|
|
{clty_params = []; (* Dummy value *)
|
|
clty_variance = [];
|
|
clty_type = dummy_cty; (* Dummy value *)
|
|
clty_path = unbound_class} (
|
|
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_id, cl_params, cl_ty,
|
|
constr_type, dummy_class)::res,
|
|
env)
|
|
|
|
let class_infos define_class kind
|
|
(cl, id, ty_id,
|
|
obj_id, obj_params, obj_ty,
|
|
cl_id, cl_params, cl_ty,
|
|
constr_type, dummy_class)
|
|
(res, env) =
|
|
|
|
reset_type_variables ();
|
|
Ctype.begin_class_def ();
|
|
|
|
(* Introduce class parameters *)
|
|
let params =
|
|
try
|
|
let params, loc = cl.pci_params in
|
|
List.map (enter_type_variable true loc) params
|
|
with Already_bound ->
|
|
raise(Error(snd cl.pci_params, Repeated_parameter))
|
|
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_expr in
|
|
Typecore.self_coercion := List.tl !Typecore.self_coercion;
|
|
res
|
|
with exn ->
|
|
Typecore.self_coercion := []; raise exn
|
|
in
|
|
|
|
Ctype.end_def ();
|
|
|
|
let sty = Ctype.self_type typ in
|
|
|
|
(* Generalize the row variable *)
|
|
let rv = Ctype.row_variable sty in
|
|
List.iter (Ctype.limited_generalize rv) params;
|
|
limited_generalize rv typ;
|
|
|
|
(* 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 ty = Ctype.self_type obj_type in
|
|
Ctype.hide_private_methods ty;
|
|
Ctype.close_object ty;
|
|
begin try
|
|
List.iter2 (Ctype.unify env) obj_params obj_params'
|
|
with Ctype.Unify _ ->
|
|
raise(Error(cl.pci_loc,
|
|
Bad_parameters (obj_id, constr,
|
|
Ctype.newconstr (Path.Pident obj_id)
|
|
obj_params')))
|
|
end;
|
|
begin try
|
|
Ctype.unify env ty constr
|
|
with Ctype.Unify _ ->
|
|
raise(Error(cl.pci_loc,
|
|
Abbrev_type_clash (constr, ty, Ctype.expand_head env constr)))
|
|
end
|
|
end;
|
|
|
|
(* Check the other temporary abbreviation (#-type) *)
|
|
begin
|
|
let (cl_params', cl_type) = Ctype.instance_class params typ in
|
|
let ty = Ctype.self_type cl_type in
|
|
Ctype.hide_private_methods ty;
|
|
Ctype.set_object_name obj_id (Ctype.row_variable ty) cl_params ty;
|
|
begin try
|
|
List.iter2 (Ctype.unify env) cl_params cl_params'
|
|
with Ctype.Unify _ ->
|
|
raise(Error(cl.pci_loc,
|
|
Bad_parameters (cl_id,
|
|
Ctype.newconstr (Path.Pident cl_id)
|
|
cl_params,
|
|
Ctype.newconstr (Path.Pident cl_id)
|
|
cl_params')))
|
|
end;
|
|
begin try
|
|
Ctype.unify env ty cl_ty
|
|
with Ctype.Unify _ ->
|
|
let constr = Ctype.newconstr (Path.Pident cl_id) params in
|
|
raise(Error(cl.pci_loc, Abbrev_type_clash (constr, ty, 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 trace ->
|
|
raise(Error(cl.pci_loc,
|
|
Constructor_type_mismatch (cl.pci_name, trace)))
|
|
end;
|
|
|
|
(* Class and class type temporary definitions *)
|
|
let cty_variance = List.map (fun _ -> true, true) params in
|
|
let cltydef =
|
|
{clty_params = params; clty_type = class_body typ;
|
|
clty_variance = cty_variance;
|
|
clty_path = Path.Pident obj_id}
|
|
and clty =
|
|
{cty_params = params; cty_type = typ;
|
|
cty_variance = cty_variance;
|
|
cty_path = Path.Pident obj_id;
|
|
cty_new =
|
|
match cl.pci_virt with
|
|
Virtual -> None
|
|
| Concrete -> Some constr_type}
|
|
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
|
|
|
|
if cl.pci_virt = Concrete then begin
|
|
let sign = Ctype.signature_of_class_type typ in
|
|
let mets = virtual_methods sign in
|
|
let vals =
|
|
Vars.fold
|
|
(fun name (mut, vr, ty) l -> if vr = Virtual then name :: l else l)
|
|
sign.cty_vars [] in
|
|
if mets <> [] || vals <> [] then
|
|
raise(Error(cl.pci_loc, Virtual_class(true, mets, vals)));
|
|
end;
|
|
|
|
(* Misc. *)
|
|
let arity = Ctype.class_type_arity typ in
|
|
let pub_meths =
|
|
let (fields, _) =
|
|
Ctype.flatten_fields (Ctype.object_fields (Ctype.expand_head env obj_ty))
|
|
in
|
|
List.map (function (lab, _, _) -> lab) fields
|
|
in
|
|
|
|
(* Final definitions *)
|
|
let (params', typ') = Ctype.instance_class params typ in
|
|
let cltydef =
|
|
{clty_params = params'; clty_type = class_body typ';
|
|
clty_variance = cty_variance;
|
|
clty_path = Path.Pident obj_id}
|
|
and clty =
|
|
{cty_params = params'; cty_type = typ';
|
|
cty_variance = cty_variance;
|
|
cty_path = Path.Pident obj_id;
|
|
cty_new =
|
|
match cl.pci_virt with
|
|
Virtual -> None
|
|
| Concrete -> Some (Ctype.instance constr_type)}
|
|
in
|
|
let obj_abbr =
|
|
{type_params = obj_params;
|
|
type_arity = List.length obj_params;
|
|
type_kind = Type_abstract;
|
|
type_private = Public;
|
|
type_manifest = Some obj_ty;
|
|
type_variance = List.map (fun _ -> true, true, true) obj_params}
|
|
in
|
|
let (cl_params, cl_ty) =
|
|
Ctype.instance_parameterized_type params (Ctype.self_type typ)
|
|
in
|
|
Ctype.hide_private_methods cl_ty;
|
|
Ctype.set_object_name obj_id (Ctype.row_variable cl_ty) cl_params cl_ty;
|
|
let cl_abbr =
|
|
{type_params = cl_params;
|
|
type_arity = List.length cl_params;
|
|
type_kind = Type_abstract;
|
|
type_private = Public;
|
|
type_manifest = Some cl_ty;
|
|
type_variance = List.map (fun _ -> true, true, true) cl_params}
|
|
in
|
|
((cl, id, clty, ty_id, cltydef, obj_id, obj_abbr, cl_id, cl_abbr,
|
|
arity, pub_meths, List.rev !coercion_locs, expr) :: res,
|
|
env)
|
|
|
|
let final_decl env define_class
|
|
(cl, id, clty, ty_id, cltydef, obj_id, obj_abbr, cl_id, cl_abbr,
|
|
arity, pub_meths, coe, expr) =
|
|
|
|
begin try Ctype.collapse_conj_params env clty.cty_params
|
|
with Ctype.Unify trace ->
|
|
raise(Error(cl.pci_loc, Non_collapsable_conjunction (id, clty, trace)))
|
|
end;
|
|
|
|
List.iter Ctype.generalize clty.cty_params;
|
|
generalize_class_type clty.cty_type;
|
|
begin match clty.cty_new with
|
|
None -> ()
|
|
| Some ty -> Ctype.generalize ty
|
|
end;
|
|
List.iter Ctype.generalize obj_abbr.type_params;
|
|
begin match obj_abbr.type_manifest with
|
|
None -> ()
|
|
| Some ty -> Ctype.generalize ty
|
|
end;
|
|
List.iter Ctype.generalize cl_abbr.type_params;
|
|
begin match cl_abbr.type_manifest with
|
|
None -> ()
|
|
| Some ty -> Ctype.generalize ty
|
|
end;
|
|
|
|
if not (closed_class clty) then
|
|
raise(Error(cl.pci_loc, Non_generalizable_class (id, clty)));
|
|
|
|
begin match
|
|
Ctype.closed_class clty.cty_params
|
|
(Ctype.signature_of_class_type clty.cty_type)
|
|
with
|
|
None -> ()
|
|
| Some reason ->
|
|
let printer =
|
|
if define_class
|
|
then function ppf -> Printtyp.class_declaration id ppf clty
|
|
else function ppf -> Printtyp.cltype_declaration id ppf cltydef
|
|
in
|
|
raise(Error(cl.pci_loc, Unbound_type_var(printer, reason)))
|
|
end;
|
|
|
|
(id, clty, ty_id, cltydef, obj_id, obj_abbr, cl_id, cl_abbr,
|
|
arity, pub_meths, coe, expr, (cl.pci_variance, cl.pci_loc))
|
|
|
|
let extract_type_decls
|
|
(id, clty, ty_id, cltydef, obj_id, obj_abbr, cl_id, cl_abbr,
|
|
arity, pub_meths, coe, expr, required) decls =
|
|
(obj_id, obj_abbr, cl_abbr, clty, cltydef, required) :: decls
|
|
|
|
let merge_type_decls
|
|
(id, _clty, ty_id, _cltydef, obj_id, _obj_abbr, cl_id, _cl_abbr,
|
|
arity, pub_meths, coe, expr, req) (obj_abbr, cl_abbr, clty, cltydef) =
|
|
(id, clty, ty_id, cltydef, obj_id, obj_abbr, cl_id, cl_abbr,
|
|
arity, pub_meths, coe, expr)
|
|
|
|
let final_env define_class env
|
|
(id, clty, ty_id, cltydef, obj_id, obj_abbr, cl_id, cl_abbr,
|
|
arity, pub_meths, coe, expr) =
|
|
(* Add definitions after cleaning them *)
|
|
Env.add_type obj_id (Subst.type_declaration Subst.identity obj_abbr) (
|
|
Env.add_type cl_id (Subst.type_declaration Subst.identity cl_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, clty, ty_id, cltydef, obj_id, obj_abbr, cl_id, cl_abbr,
|
|
arity, pub_meths, coercion_locs, expr) =
|
|
begin match coercion_locs 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 (tr1, tr2) ->
|
|
raise(Typecore.Error(loc, Typecore.Not_subtype(tr1, tr2)))
|
|
end;
|
|
if not (Ctype.opened_object cl_ty) then
|
|
raise(Error(loc, Cannot_coerce_self obj_ty))
|
|
end;
|
|
(id, clty, ty_id, cltydef, obj_id, obj_abbr, cl_id, cl_abbr,
|
|
arity, pub_meths, expr)
|
|
|
|
(*******************************)
|
|
|
|
let type_classes define_class approx kind env cls =
|
|
let cls =
|
|
List.map
|
|
(function cl ->
|
|
(cl,
|
|
Ident.create cl.pci_name, Ident.create cl.pci_name,
|
|
Ident.create cl.pci_name, Ident.create ("#" ^ cl.pci_name)))
|
|
cls
|
|
in
|
|
Ctype.init_def (Ident.current_time ());
|
|
Ctype.begin_class_def ();
|
|
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
|
|
Ctype.end_def ();
|
|
let res = List.rev_map (final_decl env define_class) res in
|
|
let decls = List.fold_right extract_type_decls res [] in
|
|
let decls = Typedecl.compute_variance_decls env decls 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 sexpr =
|
|
incr class_num;
|
|
let expr = class_expr (string_of_int !class_num) env env sexpr in
|
|
(expr, expr.cl_type)
|
|
|
|
let class_description env sexpr =
|
|
let expr = class_type env sexpr in
|
|
(expr, expr)
|
|
|
|
let class_declarations env cls =
|
|
type_classes true approx_declaration class_declaration env cls
|
|
|
|
let class_descriptions env cls =
|
|
type_classes true approx_description class_description env cls
|
|
|
|
let class_type_declarations env cls =
|
|
let (decl, env) =
|
|
type_classes false approx_description class_description env cls
|
|
in
|
|
(List.map
|
|
(function
|
|
(_, _, ty_id, cltydef, obj_id, obj_abbr, cl_id, cl_abbr, _, _, _) ->
|
|
(ty_id, cltydef, obj_id, obj_abbr, cl_id, cl_abbr))
|
|
decl,
|
|
env)
|
|
|
|
let rec unify_parents env ty cl =
|
|
match cl.cl_desc with
|
|
Tclass_ident p ->
|
|
begin try
|
|
let decl = Env.find_class p env in
|
|
let _, body = Ctype.find_cltype_for_path env decl.cty_path in
|
|
Ctype.unify env ty (Ctype.instance body)
|
|
with exn -> assert (exn = Not_found)
|
|
end
|
|
| Tclass_structure st -> unify_parents_struct env ty st
|
|
| Tclass_fun (_, _, cl, _)
|
|
| Tclass_apply (cl, _)
|
|
| Tclass_let (_, _, _, cl)
|
|
| Tclass_constraint (cl, _, _, _) -> unify_parents env ty cl
|
|
and unify_parents_struct env ty st =
|
|
List.iter
|
|
(function Cf_inher (cl, _, _) -> unify_parents env ty cl
|
|
| _ -> ())
|
|
st.cl_field
|
|
|
|
let type_object env loc s =
|
|
incr class_num;
|
|
let (desc, sign) =
|
|
class_structure (string_of_int !class_num) true env env loc s in
|
|
let sty = Ctype.expand_head env sign.cty_self in
|
|
Ctype.hide_private_methods sty;
|
|
let (fields, _) = Ctype.flatten_fields (Ctype.object_fields sty) in
|
|
let meths = List.map (fun (s,_,_) -> s) fields in
|
|
unify_parents_struct env sign.cty_self desc;
|
|
(desc, sign, meths)
|
|
|
|
let () =
|
|
Typecore.type_object := type_object
|
|
|
|
(*******************************)
|
|
|
|
(* Approximate the class declaration as class ['params] id = object end *)
|
|
let approx_class sdecl =
|
|
let self' =
|
|
{ ptyp_desc = Ptyp_any; ptyp_loc = Location.none } in
|
|
let clty' =
|
|
{ pcty_desc = Pcty_signature(self', []);
|
|
pcty_loc = sdecl.pci_expr.pcty_loc } in
|
|
{ sdecl with pci_expr = clty' }
|
|
|
|
let approx_class_declarations env sdecls =
|
|
fst (class_type_declarations env (List.map approx_class sdecls))
|
|
|
|
(*******************************)
|
|
|
|
(* Error report *)
|
|
|
|
open Format
|
|
|
|
let report_error ppf = function
|
|
| Repeated_parameter ->
|
|
fprintf ppf "A type parameter occurs several times"
|
|
| Unconsistent_constraint trace ->
|
|
fprintf ppf "The class constraints are not consistent.@.";
|
|
Printtyp.report_unification_error ppf trace
|
|
(fun ppf -> fprintf ppf "Type")
|
|
(fun ppf -> fprintf ppf "is not compatible with type")
|
|
| Field_type_mismatch (k, m, trace) ->
|
|
Printtyp.report_unification_error ppf trace
|
|
(function ppf ->
|
|
fprintf ppf "The %s %s@ has type" k m)
|
|
(function ppf ->
|
|
fprintf ppf "but is expected to have type")
|
|
| Structure_expected clty ->
|
|
fprintf ppf
|
|
"@[This class expression is not a class structure; it has type@ %a@]"
|
|
Printtyp.class_type clty
|
|
| Cannot_apply clty ->
|
|
fprintf ppf
|
|
"This class expression is not a class function, it cannot be applied"
|
|
| Apply_wrong_label l ->
|
|
let mark_label = function
|
|
| "" -> "out label"
|
|
| l -> sprintf " label ~%s" l in
|
|
fprintf ppf "This argument cannot be applied with%s" (mark_label l)
|
|
| Pattern_type_clash ty ->
|
|
(* XXX Trace *)
|
|
(* XXX Revoir message d'erreur *)
|
|
Printtyp.reset_and_mark_loops ty;
|
|
fprintf ppf "@[%s@ %a@]"
|
|
"This pattern cannot match self: it only matches values of type"
|
|
Printtyp.type_expr ty
|
|
| Unbound_class_2 cl ->
|
|
fprintf ppf "@[The class@ %a@ is not yet completely defined@]"
|
|
Printtyp.longident cl
|
|
| Unbound_class_type_2 cl ->
|
|
fprintf ppf "@[The class type@ %a@ is not yet completely defined@]"
|
|
Printtyp.longident cl
|
|
| Abbrev_type_clash (abbrev, actual, expected) ->
|
|
(* XXX Afficher une trace ? *)
|
|
Printtyp.reset_and_mark_loops_list [abbrev; actual; expected];
|
|
fprintf ppf "@[The abbreviation@ %a@ expands to type@ %a@ \
|
|
but is used with type@ %a@]"
|
|
Printtyp.type_expr abbrev
|
|
Printtyp.type_expr actual
|
|
Printtyp.type_expr expected
|
|
| Constructor_type_mismatch (c, trace) ->
|
|
Printtyp.report_unification_error ppf trace
|
|
(function ppf ->
|
|
fprintf ppf "The expression \"new %s\" has type" c)
|
|
(function ppf ->
|
|
fprintf ppf "but is used with type")
|
|
| Virtual_class (cl, mets, vals) ->
|
|
let print_mets ppf mets =
|
|
List.iter (function met -> fprintf ppf "@ %s" met) mets in
|
|
let cl_mark = if cl then "" else " type" in
|
|
let missings =
|
|
match mets, vals with
|
|
[], _ -> "variables"
|
|
| _, [] -> "methods"
|
|
| _ -> "methods and variables"
|
|
in
|
|
fprintf ppf
|
|
"@[This class%s should be virtual.@ \
|
|
@[<2>The following %s are undefined :%a@]@]"
|
|
cl_mark missings print_mets (mets @ vals)
|
|
| 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)@]"
|
|
Printtyp.longident lid expected provided
|
|
| Parameter_mismatch trace ->
|
|
Printtyp.report_unification_error ppf trace
|
|
(function ppf ->
|
|
fprintf ppf "The type parameter")
|
|
(function ppf ->
|
|
fprintf ppf "does not meet its constraint: it should be")
|
|
| Bad_parameters (id, params, cstrs) ->
|
|
Printtyp.reset_and_mark_loops_list [params; cstrs];
|
|
fprintf ppf
|
|
"@[The abbreviation %a@ is used with parameters@ %a@ \
|
|
wich are incompatible with constraints@ %a@]"
|
|
Printtyp.ident id Printtyp.type_expr params Printtyp.type_expr cstrs
|
|
| Class_match_failure error ->
|
|
Includeclass.report_error ppf error
|
|
| Unbound_val lab ->
|
|
fprintf ppf "Unbound instance variable %s" lab
|
|
| Unbound_type_var (printer, reason) ->
|
|
let print_common ppf kind ty0 real lab ty =
|
|
let ty1 =
|
|
if real then ty0 else Btype.newgenty(Tobject(ty0, ref None)) in
|
|
Printtyp.mark_loops ty1;
|
|
fprintf ppf
|
|
"The %s %s@ has type@;<1 2>%a@ where@ %a@ is unbound"
|
|
kind lab Printtyp.type_expr ty Printtyp.type_expr ty0
|
|
in
|
|
let print_reason ppf = function
|
|
| Ctype.CC_Method (ty0, real, lab, ty) ->
|
|
print_common ppf "method" ty0 real lab ty
|
|
| Ctype.CC_Value (ty0, real, lab, ty) ->
|
|
print_common ppf "instance variable" ty0 real lab ty
|
|
in
|
|
Printtyp.reset ();
|
|
fprintf ppf
|
|
"@[<v>@[Some type variables are unbound in this type:@;<1 2>%t@]@ \
|
|
@[%a@]@]"
|
|
printer print_reason reason
|
|
| Make_nongen_seltype ty ->
|
|
fprintf ppf
|
|
"@[<v>@[Self type should not occur in the non-generic type@;<1 2>\
|
|
%a@]@,\
|
|
It would escape the scope of its class@]"
|
|
Printtyp.type_scheme ty
|
|
| Non_generalizable_class (id, clty) ->
|
|
fprintf ppf
|
|
"@[The type of this class,@ %a,@ \
|
|
contains type variables that cannot be generalized@]"
|
|
(Printtyp.class_declaration id) clty
|
|
| 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@]"
|
|
Printtyp.type_scheme ty
|
|
| Non_collapsable_conjunction (id, clty, trace) ->
|
|
fprintf ppf
|
|
"@[The type of this class,@ %a,@ \
|
|
contains non-collapsible conjunctive types in constraints@]"
|
|
(Printtyp.class_declaration id) clty;
|
|
Printtyp.report_unification_error ppf trace
|
|
(fun ppf -> fprintf ppf "Type")
|
|
(fun ppf -> fprintf ppf "is not compatible with type")
|
|
| Final_self_clash trace ->
|
|
Printtyp.report_unification_error ppf trace
|
|
(function ppf ->
|
|
fprintf ppf "This object is expected to have type")
|
|
(function ppf ->
|
|
fprintf ppf "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 method@ %s@]"
|
|
"instance variable"
|
|
| No_overriding (kind, name) ->
|
|
fprintf ppf "@[The %s `%s'@ has no previous definition@]" kind name
|