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99 lines
4.0 KiB
OCaml
99 lines
4.0 KiB
OCaml
(* 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 Definitions
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module Env : sig
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type 'e t
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val empty : decl_ctx -> 'e t
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val add_var : 'e Var.t -> typ -> 'e t -> 'e t
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val add_toplevel_var : TopdefName.t -> typ -> 'e t -> 'e t
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val add_scope_var : ScopeVar.t -> typ -> 'e t -> 'e t
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val add_scope :
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ScopeName.t ->
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vars:typ ScopeVar.Map.t ->
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in_vars:typ ScopeVar.Map.t ->
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'e t ->
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'e t
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val open_scope : ScopeName.t -> 'e t -> 'e t
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val dump : Format.formatter -> 'e t -> unit
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(** For debug purposes *)
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end
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(** In the following functions, the [~leave_unresolved] labeled parameter
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controls the behavior of the typer in the case where polymorphic expressions
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are still found after typing: if set to [true], it allows them (giving them
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[TAny] and losing typing information), if set to [false], it aborts. *)
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val expr :
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leave_unresolved:bool ->
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decl_ctx ->
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?env:'e Env.t ->
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?typ:typ ->
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(('a, 'm) gexpr as 'e) ->
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('a, typed) boxed_gexpr
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(** Infers and marks the types for the given expression. If [typ] is provided,
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it is assumed to be the outer type and used for inference top-down.
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If the input expression already has type annotations, the full inference is
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still done, but with unification with the existing annotations at every
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step. This can be used for double-checking after AST transformations and
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filling the gaps ([TAny]) if any. Use [Expr.untype] first if this is not
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what you want.
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Note that typing also transparently performs the following changes to the
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AST nodes, outside of typing annotations:
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- disambiguation of constructors: [EDStructAccess] nodes are translated into
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[EStructAccess] with the suitable structure and field idents (this only
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concerns [desugared] expressions).
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- resolution of operator types, which are stored (monomorphised) back in the
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[EAppOp] nodes
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- resolution of function application input types on the [EApp] nodes, when
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that was originally empty ([[]]): this documents the arity of the function
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application, taking de-tuplification into account.
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- [TAny] appearing within nodes are refined to more precise types, e.g. on
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`EAbs` nodes (but be careful with this, it may only work for specific
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structures of generated code ; [~leave_unresolved:false] checks that it
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didn't cause problems) *)
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val check_expr :
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leave_unresolved:bool ->
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decl_ctx ->
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?env:'e Env.t ->
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?typ:typ ->
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(('a, 'm) gexpr as 'e) ->
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('a, untyped) boxed_gexpr
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(** Same as [expr], but doesn't annotate the returned expression. Equivalent to
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[Typing.expr |> Expr.untype], but more efficient. This can be useful for
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type-checking and disambiguation (some AST nodes are updated with missing
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information, e.g. any [TAny] appearing in the AST is replaced) *)
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val program :
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leave_unresolved:bool -> ('a, 'm) gexpr program -> ('a, typed) gexpr program
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(** Typing on whole programs (as defined in Shared_ast.program, i.e. for the
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later dcalc/lcalc stages.
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Any existing type annotations are checked for unification. Use
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[Program.untype] to remove them beforehand if this is not the desired
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behaviour. *)
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