2020-11-22 22:56:27 +03:00
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(* This file is part of the Catala compiler, a specification language for tax
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and social benefits computation rules. Copyright (C) 2020 Inria, contributor:
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Denis Merigoux <denis.merigoux@inria.fr>
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Licensed under the Apache License, Version 2.0 (the "License"); you may not
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use this file except in compliance with the License. You may obtain a copy of
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the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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License for the specific language governing permissions and limitations under
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the License. *)
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(** Typing for the default calculus. Because of the error terms, we perform type
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inference using the classical W algorithm with union-find unification. *)
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open Utils
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module A = Shared_ast
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module Any =
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Utils.Uid.Make
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(struct
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type info = unit
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let to_string _ = "any"
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let format_info fmt () = Format.fprintf fmt "any"
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let equal _ _ = true
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let compare _ _ = 0
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end)
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()
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type unionfind_typ = naked_typ Marked.pos UnionFind.elem
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(** We do not reuse {!type: Dcalc.Ast.naked_typ} because we have to include a
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new [TAny] variant. Indeed, error terms can have any type and this has to be
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captured by the type sytem. *)
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and naked_typ =
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| TLit of A.typ_lit
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| TArrow of unionfind_typ * unionfind_typ
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| TTuple of unionfind_typ list
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| TStruct of A.StructName.t
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| TEnum of A.EnumName.t
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| TOption of unionfind_typ
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| TArray of unionfind_typ
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| TAny of Any.t
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let rec typ_to_ast (ty : unionfind_typ) : A.typ =
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let ty, pos = UnionFind.get (UnionFind.find ty) in
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match ty with
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| TLit l -> A.TLit l, pos
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| TTuple ts -> A.TTuple (List.map typ_to_ast ts), pos
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| TStruct s -> A.TStruct s, pos
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| TEnum e -> A.TEnum e, pos
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| TOption t -> A.TOption (typ_to_ast t), pos
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| TArrow (t1, t2) -> A.TArrow (typ_to_ast t1, typ_to_ast t2), pos
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| TAny _ -> A.TAny, pos
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| TArray t1 -> A.TArray (typ_to_ast t1), pos
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let rec ast_to_typ (ty : A.typ) : unionfind_typ =
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let ty' =
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match Marked.unmark ty with
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| A.TLit l -> TLit l
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| A.TArrow (t1, t2) -> TArrow (ast_to_typ t1, ast_to_typ t2)
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| A.TTuple ts -> TTuple (List.map ast_to_typ ts)
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| A.TStruct s -> TStruct s
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| A.TEnum e -> TEnum e
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| A.TOption t -> TOption (ast_to_typ t)
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| A.TArray t -> TArray (ast_to_typ t)
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| A.TAny -> TAny (Any.fresh ())
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in
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UnionFind.make (Marked.same_mark_as ty' ty)
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(** {1 Types and unification} *)
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let typ_needs_parens (t : unionfind_typ) : bool =
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let t = UnionFind.get (UnionFind.find t) in
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match Marked.unmark t with TArrow _ | TArray _ -> true | _ -> false
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let rec format_typ
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(ctx : A.decl_ctx)
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(fmt : Format.formatter)
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(naked_typ : unionfind_typ) : unit =
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let format_typ = format_typ ctx in
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let format_typ_with_parens (fmt : Format.formatter) (t : unionfind_typ) =
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if typ_needs_parens t then Format.fprintf fmt "(%a)" format_typ t
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else Format.fprintf fmt "%a" format_typ t
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in
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let naked_typ = UnionFind.get (UnionFind.find naked_typ) in
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match Marked.unmark naked_typ with
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| TLit l -> Format.fprintf fmt "%a" A.Print.tlit l
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| TTuple ts ->
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Format.fprintf fmt "@[<hov 2>(%a)]"
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(Format.pp_print_list
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~pp_sep:(fun fmt () -> Format.fprintf fmt "@ *@ ")
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(fun fmt t -> Format.fprintf fmt "%a" format_typ t))
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ts
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| TStruct s -> Format.fprintf fmt "%a" A.StructName.format_t s
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| TEnum e -> Format.fprintf fmt "%a" A.EnumName.format_t e
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| TOption t ->
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Format.fprintf fmt "@[<hov 2>%a@ %s@]" format_typ_with_parens t "eoption"
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| TArrow (t1, t2) ->
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Format.fprintf fmt "@[<hov 2>%a →@ %a@]" format_typ_with_parens t1
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format_typ t2
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| TArray t1 -> Format.fprintf fmt "@[%a@ array@]" format_typ t1
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| TAny d -> Format.fprintf fmt "any[%d]" (Any.hash d)
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exception Type_error of A.any_marked_expr * unionfind_typ * unionfind_typ
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type mark = { pos : Pos.t; uf : unionfind_typ }
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(** Raises an error if unification cannot be performed *)
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let rec unify
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(ctx : A.decl_ctx)
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(e : ('a, 'm A.mark) A.gexpr) (* used for error context *)
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(t1 : unionfind_typ)
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(t2 : unionfind_typ) : unit =
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let unify = unify ctx in
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(* Cli.debug_format "Unifying %a and %a" (format_typ ctx) t1 (format_typ ctx)
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t2; *)
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let t1_repr = UnionFind.get (UnionFind.find t1) in
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let t2_repr = UnionFind.get (UnionFind.find t2) in
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let raise_type_error () = raise (Type_error (A.AnyExpr e, t1, t2)) in
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let repr =
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match Marked.unmark t1_repr, Marked.unmark t2_repr with
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| TLit tl1, TLit tl2 when tl1 = tl2 -> None
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| TArrow (t11, t12), TArrow (t21, t22) ->
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unify e t11 t21;
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unify e t12 t22;
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None
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| TTuple ts1, TTuple ts2 ->
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if List.length ts1 = List.length ts2 then begin
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List.iter2 (unify e) ts1 ts2;
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None
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end
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else raise_type_error ()
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| TStruct s1, TStruct s2 ->
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if A.StructName.equal s1 s2 then None else raise_type_error ()
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| TEnum e1, TEnum e2 ->
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if A.EnumName.equal e1 e2 then None else raise_type_error ()
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| TOption t1, TOption t2 ->
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unify e t1 t2;
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None
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| TArray t1', TArray t2' ->
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unify e t1' t2';
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None
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| TAny _, TAny _ -> None
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| TAny _, _ -> Some t2_repr
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| _, TAny _ -> Some t1_repr
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| ( ( TLit _ | TArrow _ | TTuple _ | TStruct _ | TEnum _ | TOption _
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| TArray _ ),
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_ ) ->
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raise_type_error ()
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in
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let t_union = UnionFind.union t1 t2 in
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match repr with None -> () | Some t_repr -> UnionFind.set t_union t_repr
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let handle_type_error ctx e t1 t2 =
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(* TODO: if we get weird error messages, then it means that we should use the
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persistent version of the union-find data structure. *)
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let pos =
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match e with
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| A.AnyExpr e -> (
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match Marked.get_mark e with Untyped { pos } | Typed { pos; _ } -> pos)
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in
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let t1_repr = UnionFind.get (UnionFind.find t1) in
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let t2_repr = UnionFind.get (UnionFind.find t2) in
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let t1_pos = Marked.get_mark t1_repr in
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let t2_pos = Marked.get_mark t2_repr in
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let unformat_typ typ =
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let buf = Buffer.create 59 in
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let ppf = Format.formatter_of_buffer buf in
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(* set infinite width to disable line cuts *)
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Format.pp_set_margin ppf max_int;
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format_typ ctx ppf typ;
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Format.pp_print_flush ppf ();
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Buffer.contents buf
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in
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let t1_s fmt () =
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Cli.format_with_style [ANSITerminal.yellow] fmt (unformat_typ t1)
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in
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let t2_s fmt () =
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Cli.format_with_style [ANSITerminal.yellow] fmt (unformat_typ t2)
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in
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Errors.raise_multispanned_error
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[
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( Some
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(Format.asprintf
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"Error coming from typechecking the following expression:"),
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pos );
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Some (Format.asprintf "Type %a coming from expression:" t1_s ()), t1_pos;
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Some (Format.asprintf "Type %a coming from expression:" t2_s ()), t2_pos;
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]
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"Error during typechecking, incompatible types:\n%a %a\n%a %a"
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(Cli.format_with_style [ANSITerminal.blue; ANSITerminal.Bold])
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"-->" t1_s ()
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(Cli.format_with_style [ANSITerminal.blue; ANSITerminal.Bold])
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"-->" t2_s ()
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(** Operators have a single type, instead of being polymorphic with constraints.
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This allows us to have a simpler type system, while we argue the syntactic
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burden of operator annotations helps the programmer visualize the type flow
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in the code. *)
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let op_type (op : A.operator Marked.pos) : unionfind_typ =
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let pos = Marked.get_mark op in
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let bt = UnionFind.make (TLit TBool, pos) in
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let it = UnionFind.make (TLit TInt, pos) in
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let rt = UnionFind.make (TLit TRat, pos) in
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let mt = UnionFind.make (TLit TMoney, pos) in
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let dut = UnionFind.make (TLit TDuration, pos) in
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let dat = UnionFind.make (TLit TDate, pos) in
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let any = UnionFind.make (TAny (Any.fresh ()), pos) in
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let array_any = UnionFind.make (TArray any, pos) in
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let any2 = UnionFind.make (TAny (Any.fresh ()), pos) in
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let array_any2 = UnionFind.make (TArray any2, pos) in
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let arr x y = UnionFind.make (TArrow (x, y), pos) in
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match Marked.unmark op with
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| A.Ternop A.Fold ->
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arr (arr any2 (arr any any2)) (arr any2 (arr array_any any2))
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| A.Binop (A.And | A.Or | A.Xor) -> arr bt (arr bt bt)
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| A.Binop (A.Add KInt | A.Sub KInt | A.Mult KInt | A.Div KInt) ->
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arr it (arr it it)
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| A.Binop (A.Add KRat | A.Sub KRat | A.Mult KRat | A.Div KRat) ->
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arr rt (arr rt rt)
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| A.Binop (A.Add KMoney | A.Sub KMoney) -> arr mt (arr mt mt)
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| A.Binop (A.Add KDuration | A.Sub KDuration) -> arr dut (arr dut dut)
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| A.Binop (A.Sub KDate) -> arr dat (arr dat dut)
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| A.Binop (A.Add KDate) -> arr dat (arr dut dat)
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| A.Binop (A.Div KDuration) -> arr dut (arr dut rt)
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| A.Binop (A.Mult KDuration) -> arr dut (arr it dut)
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| A.Binop (A.Div KMoney) -> arr mt (arr mt rt)
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| A.Binop (A.Mult KMoney) -> arr mt (arr rt mt)
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| A.Binop (A.Lt KInt | A.Lte KInt | A.Gt KInt | A.Gte KInt) ->
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arr it (arr it bt)
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| A.Binop (A.Lt KRat | A.Lte KRat | A.Gt KRat | A.Gte KRat) ->
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arr rt (arr rt bt)
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| A.Binop (A.Lt KMoney | A.Lte KMoney | A.Gt KMoney | A.Gte KMoney) ->
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arr mt (arr mt bt)
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| A.Binop (A.Lt KDate | A.Lte KDate | A.Gt KDate | A.Gte KDate) ->
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arr dat (arr dat bt)
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| A.Binop (A.Lt KDuration | A.Lte KDuration | A.Gt KDuration | A.Gte KDuration)
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->
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arr dut (arr dut bt)
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2020-11-24 13:27:23 +03:00
|
|
|
| A.Binop (A.Eq | A.Neq) -> arr any (arr any bt)
|
2021-01-10 20:11:46 +03:00
|
|
|
| A.Binop A.Map -> arr (arr any any2) (arr array_any array_any2)
|
|
|
|
| A.Binop A.Filter -> arr (arr any bt) (arr array_any array_any)
|
2021-07-08 17:27:46 +03:00
|
|
|
| A.Binop A.Concat -> arr array_any (arr array_any array_any)
|
2020-12-09 16:51:22 +03:00
|
|
|
| A.Unop (A.Minus KInt) -> arr it it
|
|
|
|
| A.Unop (A.Minus KRat) -> arr rt rt
|
|
|
|
| A.Unop (A.Minus KMoney) -> arr mt mt
|
2020-12-10 13:35:56 +03:00
|
|
|
| A.Unop (A.Minus KDuration) -> arr dut dut
|
2020-11-24 13:27:23 +03:00
|
|
|
| A.Unop A.Not -> arr bt bt
|
2021-01-20 21:58:48 +03:00
|
|
|
| A.Unop (A.Log (A.PosRecordIfTrueBool, _)) -> arr bt bt
|
2020-12-11 12:51:46 +03:00
|
|
|
| A.Unop (A.Log _) -> arr any any
|
2020-12-28 01:53:02 +03:00
|
|
|
| A.Unop A.Length -> arr array_any it
|
2021-01-05 18:00:15 +03:00
|
|
|
| A.Unop A.GetDay -> arr dat it
|
|
|
|
| A.Unop A.GetMonth -> arr dat it
|
|
|
|
| A.Unop A.GetYear -> arr dat it
|
2022-07-21 15:11:56 +03:00
|
|
|
| A.Unop A.FirstDayOfMonth -> arr dat dat
|
|
|
|
| A.Unop A.LastDayOfMonth -> arr dat dat
|
2022-03-17 14:30:14 +03:00
|
|
|
| A.Unop A.RoundMoney -> arr mt mt
|
2022-04-29 22:18:15 +03:00
|
|
|
| A.Unop A.RoundDecimal -> arr rt rt
|
2021-01-04 02:13:59 +03:00
|
|
|
| A.Unop A.IntToRat -> arr it rt
|
2022-07-19 12:48:27 +03:00
|
|
|
| A.Unop A.MoneyToRat -> arr mt rt
|
|
|
|
| A.Unop A.RatToMoney -> arr rt mt
|
2022-05-31 21:00:52 +03:00
|
|
|
| Binop (Mult KDate) | Binop (Div KDate) | Unop (Minus KDate) ->
|
2022-03-08 15:04:27 +03:00
|
|
|
Errors.raise_spanned_error pos "This operator is not available!"
|
2020-11-24 13:27:23 +03:00
|
|
|
|
2020-12-14 20:09:38 +03:00
|
|
|
(** {1 Double-directed typing} *)
|
2020-11-22 22:56:27 +03:00
|
|
|
|
2022-08-25 18:29:00 +03:00
|
|
|
type 'e env = ('e, unionfind_typ) A.Var.Map.t
|
2020-11-23 12:44:06 +03:00
|
|
|
|
2022-08-12 23:42:39 +03:00
|
|
|
let add_pos e ty = Marked.mark (A.Expr.pos e) ty
|
2022-07-28 11:36:36 +03:00
|
|
|
let ty (_, { uf; _ }) = uf
|
2022-06-23 15:04:51 +03:00
|
|
|
let ( let+ ) x f = Bindlib.box_apply f x
|
|
|
|
let ( and+ ) x1 x2 = Bindlib.box_pair x1 x2
|
|
|
|
|
2022-07-19 22:41:55 +03:00
|
|
|
(* Maps a boxing function on a list, returning a boxed list *)
|
|
|
|
let bmap (f : 'a -> 'b Bindlib.box) (es : 'a list) : 'b list Bindlib.box =
|
2022-06-23 15:04:51 +03:00
|
|
|
List.fold_right
|
|
|
|
(fun e acc ->
|
2022-07-21 15:11:56 +03:00
|
|
|
let+ e' = f e and+ acc in
|
2022-06-23 15:04:51 +03:00
|
|
|
e' :: acc)
|
|
|
|
es (Bindlib.box [])
|
2020-12-14 20:09:38 +03:00
|
|
|
|
2022-07-19 22:41:55 +03:00
|
|
|
(* Likewise, but with a function of two arguments on two lists of identical
|
|
|
|
lengths *)
|
|
|
|
let bmap2 (f : 'a -> 'b -> 'c Bindlib.box) (es : 'a list) (xs : 'b list) :
|
|
|
|
'c list Bindlib.box =
|
2022-06-23 15:04:51 +03:00
|
|
|
List.fold_right2
|
|
|
|
(fun e x acc ->
|
2022-07-21 15:11:56 +03:00
|
|
|
let+ e' = f e x and+ acc in
|
2022-06-23 15:04:51 +03:00
|
|
|
e' :: acc)
|
|
|
|
es xs (Bindlib.box [])
|
|
|
|
|
|
|
|
let box_ty e = Bindlib.unbox (Bindlib.box_apply ty e)
|
2020-11-22 22:56:27 +03:00
|
|
|
|
2020-12-14 20:09:38 +03:00
|
|
|
(** Infers the most permissive type from an expression *)
|
2021-01-14 02:17:24 +03:00
|
|
|
let rec typecheck_expr_bottom_up
|
2022-08-12 23:42:39 +03:00
|
|
|
(ctx : A.decl_ctx)
|
2022-08-25 20:46:13 +03:00
|
|
|
(env : 'm Ast.expr env)
|
2022-08-25 17:35:08 +03:00
|
|
|
(e : 'm Ast.expr) : (A.dcalc, mark) A.gexpr Bindlib.box =
|
2022-08-17 17:14:14 +03:00
|
|
|
(* Cli.debug_format "Looking for type of %a" (Expr.format ~debug:true ctx)
|
|
|
|
e; *)
|
2022-08-12 23:42:39 +03:00
|
|
|
let pos_e = A.Expr.pos e in
|
2022-08-25 17:31:32 +03:00
|
|
|
let mark (e : (A.dcalc, mark) A.naked_gexpr) uf =
|
2022-07-28 11:36:36 +03:00
|
|
|
Marked.mark { uf; pos = pos_e } e
|
2022-07-11 12:34:01 +03:00
|
|
|
in
|
2022-05-31 19:38:14 +03:00
|
|
|
let unionfind_make ?(pos = e) t = UnionFind.make (add_pos pos t) in
|
|
|
|
let mark_with_uf e1 ?pos ty = mark e1 (unionfind_make ?pos ty) in
|
|
|
|
match Marked.unmark e with
|
|
|
|
| A.EVar v -> begin
|
2022-08-12 18:59:49 +03:00
|
|
|
match A.Var.Map.find_opt v env with
|
2022-05-31 19:38:14 +03:00
|
|
|
| Some t ->
|
2022-08-12 18:59:49 +03:00
|
|
|
let+ v' = Bindlib.box_var (A.Var.translate v) in
|
2022-06-23 15:04:51 +03:00
|
|
|
mark v' t
|
2022-05-31 19:38:14 +03:00
|
|
|
| None ->
|
2022-08-12 23:42:39 +03:00
|
|
|
Errors.raise_spanned_error (A.Expr.pos e)
|
2022-07-22 12:22:54 +03:00
|
|
|
"Variable %s not found in the current context." (Bindlib.name_of v)
|
2022-07-11 12:34:01 +03:00
|
|
|
end
|
2022-06-23 15:04:51 +03:00
|
|
|
| A.ELit (LBool _) as e1 -> Bindlib.box @@ mark_with_uf e1 (TLit TBool)
|
|
|
|
| A.ELit (LInt _) as e1 -> Bindlib.box @@ mark_with_uf e1 (TLit TInt)
|
|
|
|
| A.ELit (LRat _) as e1 -> Bindlib.box @@ mark_with_uf e1 (TLit TRat)
|
|
|
|
| A.ELit (LMoney _) as e1 -> Bindlib.box @@ mark_with_uf e1 (TLit TMoney)
|
|
|
|
| A.ELit (LDate _) as e1 -> Bindlib.box @@ mark_with_uf e1 (TLit TDate)
|
|
|
|
| A.ELit (LDuration _) as e1 ->
|
|
|
|
Bindlib.box @@ mark_with_uf e1 (TLit TDuration)
|
|
|
|
| A.ELit LUnit as e1 -> Bindlib.box @@ mark_with_uf e1 (TLit TUnit)
|
|
|
|
| A.ELit LEmptyError as e1 ->
|
|
|
|
Bindlib.box @@ mark_with_uf e1 (TAny (Any.fresh ()))
|
2022-08-23 16:23:52 +03:00
|
|
|
| A.ETuple (es, None) ->
|
2022-06-23 15:04:51 +03:00
|
|
|
let+ es = bmap (typecheck_expr_bottom_up ctx env) es in
|
2022-08-23 16:23:52 +03:00
|
|
|
mark_with_uf (ETuple (es, None)) (TTuple (List.map ty es))
|
|
|
|
| A.ETuple (es, Some s_name) ->
|
|
|
|
let tys =
|
|
|
|
List.map
|
|
|
|
(fun (_, ty) -> ast_to_typ ty)
|
|
|
|
(A.StructMap.find s_name ctx.A.ctx_structs)
|
|
|
|
in
|
|
|
|
let+ es = bmap2 (typecheck_expr_top_down ctx env) tys es in
|
|
|
|
mark_with_uf (ETuple (es, Some s_name)) (TStruct s_name)
|
2022-05-31 19:38:14 +03:00
|
|
|
| A.ETupleAccess (e1, n, s, typs) -> begin
|
2022-06-23 15:04:51 +03:00
|
|
|
let utyps = List.map ast_to_typ typs in
|
2022-08-23 16:23:52 +03:00
|
|
|
let tuple_ty = match s with None -> TTuple utyps | Some s -> TStruct s in
|
|
|
|
let+ e1 = typecheck_expr_top_down ctx env (unionfind_make tuple_ty) e1 in
|
2022-05-31 19:38:14 +03:00
|
|
|
match List.nth_opt utyps n with
|
|
|
|
| Some t' -> mark (ETupleAccess (e1, n, s, typs)) t'
|
|
|
|
| None ->
|
2022-07-28 11:36:36 +03:00
|
|
|
Errors.raise_spanned_error (Marked.get_mark e1).pos
|
2022-05-31 19:38:14 +03:00
|
|
|
"Expression should have a tuple type with at least %d elements but \
|
|
|
|
only has %d"
|
|
|
|
n (List.length typs)
|
2022-07-11 12:34:01 +03:00
|
|
|
end
|
2022-05-31 19:38:14 +03:00
|
|
|
| A.EInj (e1, n, e_name, ts) ->
|
|
|
|
let ts' = List.map ast_to_typ ts in
|
|
|
|
let ts_n =
|
|
|
|
match List.nth_opt ts' n with
|
|
|
|
| Some ts_n -> ts_n
|
|
|
|
| None ->
|
2022-08-12 23:42:39 +03:00
|
|
|
Errors.raise_spanned_error (A.Expr.pos e)
|
2022-07-05 11:29:24 +03:00
|
|
|
"Expression should have a sum type with at least %d cases but only \
|
2022-06-23 15:04:51 +03:00
|
|
|
has %d"
|
2022-05-31 19:38:14 +03:00
|
|
|
n (List.length ts')
|
|
|
|
in
|
2022-07-11 12:32:23 +03:00
|
|
|
let+ e1' = typecheck_expr_top_down ctx env ts_n e1 in
|
2022-08-23 16:23:52 +03:00
|
|
|
mark_with_uf (A.EInj (e1', n, e_name, ts)) (TEnum e_name)
|
2022-07-11 12:32:23 +03:00
|
|
|
| A.EMatch (e1, es, e_name) ->
|
2022-05-31 19:38:14 +03:00
|
|
|
let enum_cases =
|
2022-07-11 12:32:23 +03:00
|
|
|
List.map (fun e' -> unionfind_make ~pos:e' (TAny (Any.fresh ()))) es
|
2022-05-31 19:38:14 +03:00
|
|
|
in
|
2022-08-23 16:23:52 +03:00
|
|
|
let t_e1 = UnionFind.make (add_pos e1 (TEnum e_name)) in
|
2022-05-31 19:38:14 +03:00
|
|
|
let t_ret = unionfind_make ~pos:e (TAny (Any.fresh ())) in
|
2022-07-11 12:32:23 +03:00
|
|
|
let+ e1' = typecheck_expr_top_down ctx env t_e1 e1
|
2022-06-23 15:04:51 +03:00
|
|
|
and+ es' =
|
|
|
|
bmap2
|
|
|
|
(fun es' enum_t ->
|
2022-07-11 12:32:23 +03:00
|
|
|
typecheck_expr_top_down ctx env
|
|
|
|
(unionfind_make ~pos:es' (TArrow (enum_t, t_ret)))
|
|
|
|
es')
|
2022-05-31 19:38:14 +03:00
|
|
|
es enum_cases
|
2022-07-11 12:34:01 +03:00
|
|
|
in
|
2022-05-31 19:38:14 +03:00
|
|
|
mark (EMatch (e1', es', e_name)) t_ret
|
|
|
|
| A.EAbs (binder, taus) ->
|
2022-06-23 15:04:51 +03:00
|
|
|
if Bindlib.mbinder_arity binder <> List.length taus then
|
2022-08-12 23:42:39 +03:00
|
|
|
Errors.raise_spanned_error (A.Expr.pos e)
|
2022-05-31 19:38:14 +03:00
|
|
|
"function has %d variables but was supplied %d types"
|
2022-06-23 15:04:51 +03:00
|
|
|
(Bindlib.mbinder_arity binder)
|
|
|
|
(List.length taus)
|
2022-07-11 12:34:01 +03:00
|
|
|
else
|
2022-06-23 15:04:51 +03:00
|
|
|
let xs, body = Bindlib.unmbind binder in
|
2022-08-12 18:59:49 +03:00
|
|
|
let xs' = Array.map A.Var.translate xs in
|
2022-07-28 11:36:36 +03:00
|
|
|
let xstaus = List.mapi (fun i tau -> xs.(i), ast_to_typ tau) taus in
|
2022-05-31 19:38:14 +03:00
|
|
|
let env =
|
2022-08-12 18:59:49 +03:00
|
|
|
List.fold_left (fun env (x, tau) -> A.Var.Map.add x tau env) env xstaus
|
2022-05-31 19:38:14 +03:00
|
|
|
in
|
|
|
|
let body' = typecheck_expr_bottom_up ctx env body in
|
|
|
|
let t_func =
|
|
|
|
List.fold_right
|
2022-07-11 12:32:23 +03:00
|
|
|
(fun (_, t_arg) acc -> unionfind_make (TArrow (t_arg, acc)))
|
2022-06-23 15:04:51 +03:00
|
|
|
xstaus (box_ty body')
|
2022-05-31 19:38:14 +03:00
|
|
|
in
|
2022-06-23 15:04:51 +03:00
|
|
|
let+ binder' = Bindlib.bind_mvar xs' body' in
|
2022-05-31 19:38:14 +03:00
|
|
|
mark (EAbs (binder', taus)) t_func
|
|
|
|
| A.EApp (e1, args) ->
|
2022-06-23 15:04:51 +03:00
|
|
|
let args' = bmap (typecheck_expr_bottom_up ctx env) args in
|
2022-05-31 19:38:14 +03:00
|
|
|
let t_ret = unionfind_make (TAny (Any.fresh ())) in
|
|
|
|
let t_func =
|
2021-01-13 14:04:14 +03:00
|
|
|
List.fold_right
|
2022-06-23 15:04:51 +03:00
|
|
|
(fun ty_arg acc -> unionfind_make (TArrow (ty_arg, acc)))
|
|
|
|
(Bindlib.unbox (Bindlib.box_apply (List.map ty) args'))
|
2021-01-13 14:04:14 +03:00
|
|
|
t_ret
|
2022-05-04 18:40:55 +03:00
|
|
|
in
|
2022-07-21 15:11:56 +03:00
|
|
|
let+ e1' = typecheck_expr_bottom_up ctx env e1 and+ args' in
|
2022-07-11 12:32:23 +03:00
|
|
|
unify ctx e (ty e1') t_func;
|
2022-05-31 19:38:14 +03:00
|
|
|
mark (EApp (e1', args')) t_ret
|
2022-06-23 15:04:51 +03:00
|
|
|
| A.EOp op as e1 -> Bindlib.box @@ mark e1 (op_type (Marked.mark pos_e op))
|
2022-05-31 19:38:14 +03:00
|
|
|
| A.EDefault (excepts, just, cons) ->
|
2022-07-11 12:32:23 +03:00
|
|
|
let just' =
|
|
|
|
typecheck_expr_top_down ctx env
|
|
|
|
(unionfind_make ~pos:just (TLit TBool))
|
2022-07-11 12:34:01 +03:00
|
|
|
just
|
|
|
|
in
|
2022-05-31 19:38:14 +03:00
|
|
|
let cons' = typecheck_expr_bottom_up ctx env cons in
|
2022-06-23 15:04:51 +03:00
|
|
|
let tau = box_ty cons' in
|
2022-07-21 15:11:56 +03:00
|
|
|
let+ just'
|
|
|
|
and+ cons'
|
2022-06-23 15:04:51 +03:00
|
|
|
and+ excepts' =
|
2022-07-11 12:32:23 +03:00
|
|
|
bmap (fun except -> typecheck_expr_top_down ctx env tau except) excepts
|
2022-07-11 12:34:01 +03:00
|
|
|
in
|
2022-05-31 19:38:14 +03:00
|
|
|
mark (A.EDefault (excepts', just', cons')) tau
|
|
|
|
| A.EIfThenElse (cond, et, ef) ->
|
2022-07-11 12:32:23 +03:00
|
|
|
let cond' =
|
|
|
|
typecheck_expr_top_down ctx env
|
|
|
|
(unionfind_make ~pos:cond (TLit TBool))
|
2022-07-11 12:34:01 +03:00
|
|
|
cond
|
|
|
|
in
|
2022-05-31 19:38:14 +03:00
|
|
|
let et' = typecheck_expr_bottom_up ctx env et in
|
2022-06-23 15:04:51 +03:00
|
|
|
let tau = box_ty et' in
|
2022-07-21 15:11:56 +03:00
|
|
|
let+ cond' and+ et' and+ ef' = typecheck_expr_top_down ctx env tau ef in
|
2022-05-31 19:38:14 +03:00
|
|
|
mark (A.EIfThenElse (cond', et', ef')) tau
|
|
|
|
| A.EAssert e1 ->
|
2022-06-23 15:04:51 +03:00
|
|
|
let+ e1' =
|
2022-07-11 12:32:23 +03:00
|
|
|
typecheck_expr_top_down ctx env (unionfind_make ~pos:e1 (TLit TBool)) e1
|
2022-07-11 12:34:01 +03:00
|
|
|
in
|
2022-05-31 19:38:14 +03:00
|
|
|
mark_with_uf (A.EAssert e1') ~pos:e1 (TLit TUnit)
|
|
|
|
| A.ErrorOnEmpty e1 ->
|
2022-06-23 15:04:51 +03:00
|
|
|
let+ e1' = typecheck_expr_bottom_up ctx env e1 in
|
2022-05-31 19:38:14 +03:00
|
|
|
mark (A.ErrorOnEmpty e1') (ty e1')
|
|
|
|
| A.EArray es ->
|
|
|
|
let cell_type = unionfind_make (TAny (Any.fresh ())) in
|
2022-06-23 15:04:51 +03:00
|
|
|
let+ es' =
|
2022-07-11 12:34:01 +03:00
|
|
|
bmap
|
2022-05-31 19:38:14 +03:00
|
|
|
(fun e1 ->
|
|
|
|
let e1' = typecheck_expr_bottom_up ctx env e1 in
|
2022-07-11 12:32:23 +03:00
|
|
|
unify ctx e1 cell_type (box_ty e1');
|
2022-07-11 12:34:01 +03:00
|
|
|
e1')
|
|
|
|
es
|
|
|
|
in
|
2022-05-31 19:38:14 +03:00
|
|
|
mark_with_uf (A.EArray es') (TArray cell_type)
|
2022-05-04 18:40:55 +03:00
|
|
|
|
2021-01-13 14:04:14 +03:00
|
|
|
(** Checks whether the expression can be typed with the provided type *)
|
2021-01-14 02:17:24 +03:00
|
|
|
and typecheck_expr_top_down
|
2022-08-12 23:42:39 +03:00
|
|
|
(ctx : A.decl_ctx)
|
2022-08-25 20:46:13 +03:00
|
|
|
(env : 'm Ast.expr env)
|
2022-08-25 18:29:00 +03:00
|
|
|
(tau : unionfind_typ)
|
2022-08-25 17:35:08 +03:00
|
|
|
(e : 'm Ast.expr) : (A.dcalc, mark) A.gexpr Bindlib.box =
|
2022-08-25 20:46:13 +03:00
|
|
|
(* Cli.debug_format "Propagating type %a for naked_expr %a" (format_typ ctx)
|
|
|
|
tau (Expr.format ctx) e; *)
|
2022-08-12 23:42:39 +03:00
|
|
|
let pos_e = A.Expr.pos e in
|
2022-07-28 11:36:36 +03:00
|
|
|
let mark e = Marked.mark { uf = tau; pos = pos_e } e in
|
2022-08-25 17:31:32 +03:00
|
|
|
let unify_and_mark (e' : (A.dcalc, mark) A.naked_gexpr) tau' =
|
2022-08-19 15:43:56 +03:00
|
|
|
(* This try...with was added because of
|
|
|
|
[tests/test_bool/bad/bad_assert.catala_en] but we shouldn't need it.
|
|
|
|
TODO: debug why it is needed here. *)
|
2022-08-16 15:25:06 +03:00
|
|
|
(try unify ctx e tau tau'
|
2022-08-15 17:20:31 +03:00
|
|
|
with Type_error (e', t1, t2) -> handle_type_error ctx e' t1 t2);
|
2022-07-28 11:36:36 +03:00
|
|
|
Marked.mark { uf = tau; pos = pos_e } e'
|
2022-07-11 12:34:01 +03:00
|
|
|
in
|
2022-05-31 19:38:14 +03:00
|
|
|
let unionfind_make ?(pos = e) t = UnionFind.make (add_pos pos t) in
|
2022-05-30 12:20:48 +03:00
|
|
|
match Marked.unmark e with
|
2022-05-31 19:38:14 +03:00
|
|
|
| A.EVar v -> begin
|
2022-08-12 18:59:49 +03:00
|
|
|
match A.Var.Map.find_opt v env with
|
2022-07-06 17:56:16 +03:00
|
|
|
| Some tau' ->
|
2022-08-12 18:59:49 +03:00
|
|
|
let+ v' = Bindlib.box_var (A.Var.translate v) in
|
2022-06-23 15:04:51 +03:00
|
|
|
unify_and_mark v' tau'
|
2022-05-31 19:38:14 +03:00
|
|
|
| None ->
|
2022-07-28 11:36:36 +03:00
|
|
|
Errors.raise_spanned_error pos_e
|
2022-07-22 12:22:54 +03:00
|
|
|
"Variable %s not found in the current context" (Bindlib.name_of v)
|
2022-07-11 12:34:01 +03:00
|
|
|
end
|
2022-06-23 15:04:51 +03:00
|
|
|
| A.ELit (LBool _) as e1 ->
|
|
|
|
Bindlib.box @@ unify_and_mark e1 (unionfind_make (TLit TBool))
|
|
|
|
| A.ELit (LInt _) as e1 ->
|
|
|
|
Bindlib.box @@ unify_and_mark e1 (unionfind_make (TLit TInt))
|
|
|
|
| A.ELit (LRat _) as e1 ->
|
|
|
|
Bindlib.box @@ unify_and_mark e1 (unionfind_make (TLit TRat))
|
2022-05-31 19:38:14 +03:00
|
|
|
| A.ELit (LMoney _) as e1 ->
|
2022-06-23 15:04:51 +03:00
|
|
|
Bindlib.box @@ unify_and_mark e1 (unionfind_make (TLit TMoney))
|
|
|
|
| A.ELit (LDate _) as e1 ->
|
|
|
|
Bindlib.box @@ unify_and_mark e1 (unionfind_make (TLit TDate))
|
2022-05-31 19:38:14 +03:00
|
|
|
| A.ELit (LDuration _) as e1 ->
|
2022-06-23 15:04:51 +03:00
|
|
|
Bindlib.box @@ unify_and_mark e1 (unionfind_make (TLit TDuration))
|
|
|
|
| A.ELit LUnit as e1 ->
|
|
|
|
Bindlib.box @@ unify_and_mark e1 (unionfind_make (TLit TUnit))
|
2022-05-31 19:38:14 +03:00
|
|
|
| A.ELit LEmptyError as e1 ->
|
2022-06-23 15:04:51 +03:00
|
|
|
Bindlib.box @@ unify_and_mark e1 (unionfind_make (TAny (Any.fresh ())))
|
2022-08-23 16:23:52 +03:00
|
|
|
| A.ETuple (es, None) ->
|
2022-06-23 15:04:51 +03:00
|
|
|
let+ es' = bmap (typecheck_expr_bottom_up ctx env) es in
|
|
|
|
unify_and_mark
|
2022-08-23 16:23:52 +03:00
|
|
|
(A.ETuple (es', None))
|
|
|
|
(unionfind_make (TTuple (List.map ty es')))
|
|
|
|
| A.ETuple (es, Some s_name) ->
|
|
|
|
let tys =
|
|
|
|
List.map
|
|
|
|
(fun (_, ty) -> ast_to_typ ty)
|
|
|
|
(A.StructMap.find s_name ctx.A.ctx_structs)
|
|
|
|
in
|
|
|
|
let+ es' = bmap2 (typecheck_expr_top_down ctx env) tys es in
|
|
|
|
unify_and_mark
|
|
|
|
(A.ETuple (es', Some s_name))
|
|
|
|
(unionfind_make (TStruct s_name))
|
2022-05-31 19:38:14 +03:00
|
|
|
| A.ETupleAccess (e1, n, s, typs) -> begin
|
2022-06-23 15:04:51 +03:00
|
|
|
let typs' = List.map ast_to_typ typs in
|
2022-08-23 16:23:52 +03:00
|
|
|
let tuple_ty = match s with None -> TTuple typs' | Some s -> TStruct s in
|
|
|
|
let+ e1' = typecheck_expr_top_down ctx env (unionfind_make tuple_ty) e1 in
|
2022-05-31 19:38:14 +03:00
|
|
|
match List.nth_opt typs' n with
|
2022-07-06 17:56:16 +03:00
|
|
|
| Some t1n -> unify_and_mark (A.ETupleAccess (e1', n, s, typs)) t1n
|
2022-05-31 19:38:14 +03:00
|
|
|
| None ->
|
2022-08-12 23:42:39 +03:00
|
|
|
Errors.raise_spanned_error (A.Expr.pos e1)
|
2022-07-05 11:29:24 +03:00
|
|
|
"Expression should have a tuple type with at least %d elements but \
|
2022-05-31 19:38:14 +03:00
|
|
|
only has %d"
|
|
|
|
n (List.length typs)
|
|
|
|
end
|
|
|
|
| A.EInj (e1, n, e_name, ts) ->
|
2022-06-23 15:04:51 +03:00
|
|
|
let ts' = List.map ast_to_typ ts in
|
|
|
|
let ts_n =
|
|
|
|
match List.nth_opt ts' n with
|
|
|
|
| Some ts_n -> ts_n
|
2021-01-05 17:33:30 +03:00
|
|
|
| None ->
|
2022-08-12 23:42:39 +03:00
|
|
|
Errors.raise_spanned_error (A.Expr.pos e)
|
2022-03-08 15:04:27 +03:00
|
|
|
"Expression should have a sum type with at least %d cases but only \
|
2022-07-11 12:34:01 +03:00
|
|
|
has %d"
|
2022-03-08 15:04:27 +03:00
|
|
|
n (List.length ts)
|
2022-07-11 12:34:01 +03:00
|
|
|
in
|
2022-07-11 12:32:23 +03:00
|
|
|
let+ e1' = typecheck_expr_top_down ctx env ts_n e1 in
|
2022-08-23 16:23:52 +03:00
|
|
|
unify_and_mark (A.EInj (e1', n, e_name, ts)) (unionfind_make (TEnum e_name))
|
2022-05-31 19:38:14 +03:00
|
|
|
| A.EMatch (e1, es, e_name) ->
|
2020-12-30 00:26:10 +03:00
|
|
|
let enum_cases =
|
2022-05-31 19:38:14 +03:00
|
|
|
List.map (fun e' -> unionfind_make ~pos:e' (TAny (Any.fresh ()))) es
|
2022-07-11 12:34:01 +03:00
|
|
|
in
|
2022-05-31 19:38:14 +03:00
|
|
|
let e1' =
|
2022-08-23 16:23:52 +03:00
|
|
|
typecheck_expr_top_down ctx env (unionfind_make ~pos:e1 (TEnum e_name)) e1
|
2022-07-11 12:34:01 +03:00
|
|
|
in
|
2022-05-31 19:38:14 +03:00
|
|
|
let t_ret = unionfind_make ~pos:e (TAny (Any.fresh ())) in
|
2022-07-21 15:11:56 +03:00
|
|
|
let+ e1'
|
2022-06-23 15:04:51 +03:00
|
|
|
and+ es' =
|
2022-07-11 12:34:01 +03:00
|
|
|
bmap2
|
2022-06-23 15:04:51 +03:00
|
|
|
(fun es' enum_t ->
|
2022-07-11 12:32:23 +03:00
|
|
|
typecheck_expr_top_down ctx env
|
|
|
|
(unionfind_make ~pos:es' (TArrow (enum_t, t_ret)))
|
2022-07-11 12:34:01 +03:00
|
|
|
es')
|
2022-05-31 19:38:14 +03:00
|
|
|
es enum_cases
|
2022-07-11 12:34:01 +03:00
|
|
|
in
|
2022-05-31 19:38:14 +03:00
|
|
|
unify_and_mark (EMatch (e1', es', e_name)) t_ret
|
|
|
|
| A.EAbs (binder, t_args) ->
|
2022-06-23 15:04:51 +03:00
|
|
|
if Bindlib.mbinder_arity binder <> List.length t_args then
|
2022-08-12 23:42:39 +03:00
|
|
|
Errors.raise_spanned_error (A.Expr.pos e)
|
2022-05-31 19:38:14 +03:00
|
|
|
"function has %d variables but was supplied %d types"
|
2022-06-23 15:04:51 +03:00
|
|
|
(Bindlib.mbinder_arity binder)
|
|
|
|
(List.length t_args)
|
2022-05-31 19:38:14 +03:00
|
|
|
else
|
2022-06-23 15:04:51 +03:00
|
|
|
let xs, body = Bindlib.unmbind binder in
|
2022-08-12 18:59:49 +03:00
|
|
|
let xs' = Array.map A.Var.translate xs in
|
2022-06-23 15:04:51 +03:00
|
|
|
let xstaus =
|
|
|
|
List.map2 (fun x t_arg -> x, ast_to_typ t_arg) (Array.to_list xs) t_args
|
2022-05-04 18:40:55 +03:00
|
|
|
in
|
2022-06-23 15:04:51 +03:00
|
|
|
let env =
|
|
|
|
List.fold_left
|
2022-08-12 18:59:49 +03:00
|
|
|
(fun env (x, t_arg) -> A.Var.Map.add x t_arg env)
|
2022-06-23 15:04:51 +03:00
|
|
|
env xstaus
|
2022-05-04 18:40:55 +03:00
|
|
|
in
|
2022-06-23 15:04:51 +03:00
|
|
|
let body' = typecheck_expr_bottom_up ctx env body in
|
2021-01-13 14:04:14 +03:00
|
|
|
let t_func =
|
2020-12-30 00:26:10 +03:00
|
|
|
List.fold_right
|
2022-06-23 15:04:51 +03:00
|
|
|
(fun (_, t_arg) acc -> unionfind_make (TArrow (t_arg, acc)))
|
|
|
|
xstaus (box_ty body')
|
2022-05-04 18:40:55 +03:00
|
|
|
in
|
2022-06-23 15:04:51 +03:00
|
|
|
let+ binder' = Bindlib.bind_mvar xs' body' in
|
|
|
|
unify_and_mark (EAbs (binder', t_args)) t_func
|
2022-05-31 19:38:14 +03:00
|
|
|
| A.EApp (e1, args) ->
|
2022-06-23 15:04:51 +03:00
|
|
|
let+ args' = bmap (typecheck_expr_bottom_up ctx env) args
|
|
|
|
and+ e1' = typecheck_expr_bottom_up ctx env e1 in
|
2021-01-13 14:04:14 +03:00
|
|
|
let t_func =
|
2020-12-30 00:26:10 +03:00
|
|
|
List.fold_right
|
2022-05-31 19:38:14 +03:00
|
|
|
(fun arg acc -> unionfind_make (TArrow (ty arg, acc)))
|
|
|
|
args' tau
|
2022-05-04 18:40:55 +03:00
|
|
|
in
|
2022-07-11 12:32:23 +03:00
|
|
|
unify ctx e (ty e1') t_func;
|
2022-07-05 11:29:02 +03:00
|
|
|
unify_and_mark (EApp (e1', args')) tau
|
2022-05-31 19:38:14 +03:00
|
|
|
| A.EOp op as e1 ->
|
|
|
|
let op_typ = op_type (add_pos e op) in
|
2022-06-23 15:04:51 +03:00
|
|
|
Bindlib.box (unify_and_mark e1 op_typ)
|
2022-05-31 19:38:14 +03:00
|
|
|
| A.EDefault (excepts, just, cons) ->
|
2022-07-11 12:32:23 +03:00
|
|
|
let+ just' =
|
|
|
|
typecheck_expr_top_down ctx env
|
|
|
|
(unionfind_make ~pos:just (TLit TBool))
|
|
|
|
just
|
|
|
|
and+ cons' = typecheck_expr_top_down ctx env tau cons
|
|
|
|
and+ excepts' = bmap (typecheck_expr_top_down ctx env tau) excepts in
|
2022-05-31 19:38:14 +03:00
|
|
|
mark (A.EDefault (excepts', just', cons'))
|
|
|
|
| A.EIfThenElse (cond, et, ef) ->
|
2022-07-11 12:32:23 +03:00
|
|
|
let+ cond' =
|
|
|
|
typecheck_expr_top_down ctx env
|
|
|
|
(unionfind_make ~pos:cond (TLit TBool))
|
|
|
|
cond
|
|
|
|
and+ et' = typecheck_expr_top_down ctx env tau et
|
|
|
|
and+ ef' = typecheck_expr_top_down ctx env tau ef in
|
2022-05-31 19:38:14 +03:00
|
|
|
mark (A.EIfThenElse (cond', et', ef'))
|
|
|
|
| A.EAssert e1 ->
|
2022-07-11 12:32:23 +03:00
|
|
|
let+ e1' =
|
|
|
|
typecheck_expr_top_down ctx env (unionfind_make ~pos:e1 (TLit TBool)) e1
|
|
|
|
in
|
2022-05-31 19:38:14 +03:00
|
|
|
unify_and_mark (EAssert e1') (unionfind_make ~pos:e1 (TLit TUnit))
|
|
|
|
| A.ErrorOnEmpty e1 ->
|
2022-07-11 12:32:23 +03:00
|
|
|
let+ e1' = typecheck_expr_top_down ctx env tau e1 in
|
2022-05-31 19:38:14 +03:00
|
|
|
mark (A.ErrorOnEmpty e1')
|
|
|
|
| A.EArray es ->
|
|
|
|
let cell_type = unionfind_make (TAny (Any.fresh ())) in
|
2022-06-23 15:04:51 +03:00
|
|
|
let+ es' =
|
|
|
|
bmap
|
2022-05-31 19:38:14 +03:00
|
|
|
(fun e1 ->
|
|
|
|
let e1' = typecheck_expr_bottom_up ctx env e1 in
|
2022-07-11 12:32:23 +03:00
|
|
|
unify ctx e cell_type (box_ty e1');
|
2022-05-31 19:38:14 +03:00
|
|
|
e1')
|
|
|
|
es
|
2022-05-04 18:40:55 +03:00
|
|
|
in
|
2022-05-31 19:38:14 +03:00
|
|
|
unify_and_mark (A.EArray es') (unionfind_make (TArray cell_type))
|
2022-07-11 12:32:23 +03:00
|
|
|
|
|
|
|
let wrap ctx f e =
|
|
|
|
try f e
|
|
|
|
with Type_error (e, ty1, ty2) -> (
|
|
|
|
let bt = Printexc.get_raw_backtrace () in
|
|
|
|
try handle_type_error ctx e ty1 ty2
|
|
|
|
with e -> Printexc.raise_with_backtrace e bt)
|
2020-11-23 12:44:06 +03:00
|
|
|
|
2020-12-14 20:09:38 +03:00
|
|
|
(** {1 API} *)
|
|
|
|
|
2022-07-28 11:36:36 +03:00
|
|
|
let get_ty_mark { uf; pos } = A.Typed { ty = typ_to_ast uf; pos }
|
2022-07-19 16:19:06 +03:00
|
|
|
|
2020-12-14 20:09:38 +03:00
|
|
|
(* Infer the type of an expression *)
|
2022-08-25 17:35:08 +03:00
|
|
|
let infer_types (ctx : A.decl_ctx) (e : 'm Ast.expr) :
|
|
|
|
A.typed Ast.expr Bindlib.box =
|
2022-08-12 18:59:49 +03:00
|
|
|
A.Expr.map_marks ~f:get_ty_mark
|
2022-07-19 16:19:06 +03:00
|
|
|
@@ Bindlib.unbox
|
2022-08-12 18:59:49 +03:00
|
|
|
@@ wrap ctx (typecheck_expr_bottom_up ctx A.Var.Map.empty) e
|
2022-05-31 19:38:14 +03:00
|
|
|
|
2022-08-25 17:35:08 +03:00
|
|
|
let infer_type (type m) ctx (e : m Ast.expr) =
|
2022-05-31 19:38:14 +03:00
|
|
|
match Marked.get_mark e with
|
2022-07-19 16:19:06 +03:00
|
|
|
| A.Typed { ty; _ } -> ty
|
2022-08-12 23:42:39 +03:00
|
|
|
| A.Untyped _ -> A.Expr.ty (Bindlib.unbox (infer_types ctx e))
|
2020-11-23 12:44:06 +03:00
|
|
|
|
2020-12-14 20:09:38 +03:00
|
|
|
(** Typechecks an expression given an expected type *)
|
2022-08-25 20:46:13 +03:00
|
|
|
let check_type (ctx : A.decl_ctx) (e : 'm Ast.expr) (tau : A.typ) =
|
2022-05-31 19:38:14 +03:00
|
|
|
(* todo: consider using the already inferred type if ['m] = [typed] *)
|
|
|
|
ignore
|
2022-08-12 18:59:49 +03:00
|
|
|
@@ wrap ctx (typecheck_expr_top_down ctx A.Var.Map.empty (ast_to_typ tau)) e
|
2022-05-31 19:38:14 +03:00
|
|
|
|
|
|
|
let infer_types_program prg =
|
2022-07-05 11:29:02 +03:00
|
|
|
let ctx = prg.A.decl_ctx in
|
|
|
|
let rec process_scopes env = function
|
|
|
|
| A.Nil -> Bindlib.box A.Nil
|
|
|
|
| A.ScopeDef
|
|
|
|
{
|
|
|
|
scope_next;
|
|
|
|
scope_name;
|
|
|
|
scope_body =
|
|
|
|
{
|
|
|
|
scope_body_input_struct = s_in;
|
|
|
|
scope_body_output_struct = s_out;
|
|
|
|
scope_body_expr = body;
|
|
|
|
};
|
|
|
|
} ->
|
|
|
|
let scope_pos = Marked.get_mark (A.ScopeName.get_info scope_name) in
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|
|
|
let struct_ty struct_name =
|
2022-08-23 16:23:52 +03:00
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|
UnionFind.make (Marked.mark scope_pos (TStruct struct_name))
|
2022-07-05 11:29:02 +03:00
|
|
|
in
|
|
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|
let ty_in = struct_ty s_in in
|
|
|
|
let ty_out = struct_ty s_out in
|
|
|
|
let ty_scope =
|
|
|
|
UnionFind.make (Marked.mark scope_pos (TArrow (ty_in, ty_out)))
|
|
|
|
in
|
|
|
|
let rec process_scope_body_expr env = function
|
|
|
|
| A.Result e ->
|
2022-08-15 17:20:31 +03:00
|
|
|
let e' = wrap ctx (typecheck_expr_bottom_up ctx env) e in
|
2022-07-11 12:32:23 +03:00
|
|
|
Bindlib.box_apply
|
2022-07-28 11:36:36 +03:00
|
|
|
(fun e1 ->
|
2022-08-16 15:25:06 +03:00
|
|
|
wrap ctx (unify ctx e (ty e1)) ty_out;
|
2022-08-12 18:59:49 +03:00
|
|
|
let e1 = A.Expr.map_marks ~f:get_ty_mark e1 in
|
2022-07-28 11:36:36 +03:00
|
|
|
A.Result (Bindlib.unbox e1))
|
2022-07-11 12:32:23 +03:00
|
|
|
e'
|
2022-07-05 11:29:02 +03:00
|
|
|
| A.ScopeLet
|
|
|
|
{
|
|
|
|
scope_let_kind;
|
|
|
|
scope_let_typ;
|
2022-07-28 11:36:36 +03:00
|
|
|
scope_let_expr = e0;
|
2022-07-05 11:29:02 +03:00
|
|
|
scope_let_next;
|
|
|
|
scope_let_pos;
|
|
|
|
} ->
|
2022-07-07 16:15:26 +03:00
|
|
|
let ty_e = ast_to_typ scope_let_typ in
|
2022-08-16 15:25:06 +03:00
|
|
|
let e = wrap ctx (typecheck_expr_bottom_up ctx env) e0 in
|
2022-07-05 11:29:02 +03:00
|
|
|
let var, next = Bindlib.unbind scope_let_next in
|
2022-08-12 18:59:49 +03:00
|
|
|
let env = A.Var.Map.add var ty_e env in
|
2022-07-05 11:29:02 +03:00
|
|
|
let next = process_scope_body_expr env next in
|
2022-08-12 18:59:49 +03:00
|
|
|
let scope_let_next = Bindlib.bind_var (A.Var.translate var) next in
|
2022-07-05 11:29:02 +03:00
|
|
|
Bindlib.box_apply2
|
2022-07-28 11:36:36 +03:00
|
|
|
(fun e scope_let_next ->
|
2022-08-16 15:25:06 +03:00
|
|
|
wrap ctx (unify ctx e0 (ty e)) ty_e;
|
2022-08-12 18:59:49 +03:00
|
|
|
let e = A.Expr.map_marks ~f:get_ty_mark e in
|
2022-07-05 11:29:02 +03:00
|
|
|
A.ScopeLet
|
|
|
|
{
|
|
|
|
scope_let_kind;
|
|
|
|
scope_let_typ;
|
2022-07-28 11:36:36 +03:00
|
|
|
scope_let_expr = Bindlib.unbox e;
|
2022-07-05 11:29:02 +03:00
|
|
|
scope_let_next;
|
|
|
|
scope_let_pos;
|
|
|
|
})
|
|
|
|
e scope_let_next
|
|
|
|
in
|
|
|
|
let scope_body_expr =
|
|
|
|
let var, e = Bindlib.unbind body in
|
2022-08-12 18:59:49 +03:00
|
|
|
let env = A.Var.Map.add var ty_in env in
|
2022-07-19 16:19:06 +03:00
|
|
|
let e' = process_scope_body_expr env e in
|
2022-08-12 18:59:49 +03:00
|
|
|
Bindlib.bind_var (A.Var.translate var) e'
|
2022-07-05 11:29:02 +03:00
|
|
|
in
|
|
|
|
let scope_next =
|
|
|
|
let scope_var, next = Bindlib.unbind scope_next in
|
2022-08-12 18:59:49 +03:00
|
|
|
let env = A.Var.Map.add scope_var ty_scope env in
|
2022-07-19 16:19:06 +03:00
|
|
|
let next' = process_scopes env next in
|
2022-08-12 18:59:49 +03:00
|
|
|
Bindlib.bind_var (A.Var.translate scope_var) next'
|
2022-07-05 11:29:02 +03:00
|
|
|
in
|
|
|
|
Bindlib.box_apply2
|
|
|
|
(fun scope_body_expr scope_next ->
|
|
|
|
A.ScopeDef
|
|
|
|
{
|
|
|
|
scope_next;
|
|
|
|
scope_name;
|
|
|
|
scope_body =
|
|
|
|
{
|
|
|
|
scope_body_input_struct = s_in;
|
|
|
|
scope_body_output_struct = s_out;
|
|
|
|
scope_body_expr;
|
|
|
|
};
|
|
|
|
})
|
|
|
|
scope_body_expr scope_next
|
2022-05-31 19:38:14 +03:00
|
|
|
in
|
2022-08-12 18:59:49 +03:00
|
|
|
let scopes = wrap ctx (process_scopes A.Var.Map.empty) prg.scopes in
|
2022-07-05 11:29:02 +03:00
|
|
|
Bindlib.box_apply (fun scopes -> { A.decl_ctx = ctx; scopes }) scopes
|
|
|
|
|> Bindlib.unbox
|