130 lines
5.9 KiB
OCaml
130 lines
5.9 KiB
OCaml
(***********************************************************************)
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(* *)
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(* Objective Caml *)
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(* *)
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(* Xavier Leroy, 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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(* Automatique. Distributed only by permission. *)
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(* *)
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(***********************************************************************)
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(* $Id$ *)
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(* Operations on core types *)
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open Asttypes
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open Types
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val generic_level: int
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val init_def: int -> unit
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(* Set the initial variable level *)
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val begin_def: unit -> unit
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(* Raise the variable level by one at the beginning of a definition. *)
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val end_def: unit -> unit
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(* Lower the variable level by one at the end of a definition *)
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val reset_global_level: unit -> unit
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val newty: type_desc -> type_expr
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val newgenty: type_desc -> type_expr
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val newvar: unit -> type_expr
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(* Return a fresh variable *)
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val new_global_var: unit -> type_expr
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(* Return a fresh variable, bound at toplevel
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(as type variables ['a] in type constraints). *)
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val newobj: type_expr -> type_expr
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val repr: type_expr -> type_expr
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(* Return the canonical representative of a type. *)
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val flatten_fields : type_expr -> (string * type_expr) list * type_expr
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(* Transform a field type into a list of pairs label-type *)
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val generalize: type_expr -> unit
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(* Generalize in-place the given type *)
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val make_nongen: type_expr -> unit
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(* Make non-generalizable the given type *)
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val instance: type_expr -> type_expr
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(* Take an instance of a type scheme *)
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val instance_parameterized_type:
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type_expr list -> type_expr -> type_expr list * type_expr
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val instance_parameterized_type_2:
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type_expr list -> type_expr list -> type_expr ->
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type_expr list * type_expr list * type_expr
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val instance_constructor:
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constructor_description -> type_expr list * type_expr
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(* Same, for a constructor *)
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val instance_label: label_description -> type_expr * type_expr
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(* Same, for a label *)
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val instance_class:
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class_type ->
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type_expr list * type_expr list *
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(mutable_flag * type_expr) Vars.t * type_expr
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val expand_abbrev:
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Env.t -> Path.t -> type_expr list -> (Path.t * type_expr) list ref ->
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int -> type_expr
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(* Expand an abbreviation *)
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val full_expand: Env.t -> type_expr -> type_expr
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val expand_root: Env.t -> type_expr -> type_expr
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val occur: Env.t -> type_expr -> type_expr -> unit
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(* [occur env var ty] Raise [Unify] if [var] occurs in [ty] *)
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val unify: Env.t -> type_expr -> type_expr -> unit
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(* Unify the two types given. Raise [Unify] if not possible. *)
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val filter_arrow: Env.t -> type_expr -> type_expr * type_expr
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(* A special case of unification (with 'a -> 'b). *)
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val filter_method: Env.t -> string -> type_expr -> type_expr
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(* A special case of unification (with {m : 'a; 'b}). *)
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val moregeneral: Env.t -> type_expr -> type_expr -> bool
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(* Check if the first type scheme is more general than the second. *)
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val equal: Env.t -> type_expr list -> type_expr ->
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type_expr list -> type_expr -> bool
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(* [equal env [x1...xn] tau [y1...yn] sigma]
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checks whether the parameterized types
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[/\x1.../\xn.tau] and [/\y1.../\yn.sigma] are equivalent. *)
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val opened_object: type_expr -> bool
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val enlarge_type: Env.t -> type_expr -> type_expr
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(* Make a type larger *)
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val subtype : Env.t -> type_expr -> type_expr -> unit -> unit
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(* [subtype env t1 t2] checks that [t1] is a subtype of [t2].
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It accumulates the constraints the type variables must
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enforce and returns a function that inforce this
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constraints. *)
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val closed_schema: type_expr -> bool
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type closed_schema_result = Var of type_expr | Row_var of type_expr
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val closed_schema_verbose: type_expr -> closed_schema_result option
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(* Check whether the given type scheme contains no non-generic
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type variables *)
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val nondep_type: Env.t -> Ident.t -> type_expr -> type_expr
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(* Return a type equivalent to the given type but without
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references to the given module identifier. Raise [Not_found]
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if no such type exists. *)
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val nondep_class_type: Env.t -> Ident.t -> class_type -> class_type
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(* Same for class types. *)
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val substitute:
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(Path.t * type_expr) list -> type_expr list ->
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type_expr list -> type_expr -> type_expr
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(* [substitute [v1...vN] [t1...tN] t]
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returns a copy of [t] where the [vi] are replaced
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by the [ti]. *)
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val prune:
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type_expr -> type_expr list -> type_expr * (type_expr * type_expr) list
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val prune_class_type:
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class_type ->
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(type_expr * type_expr) list * type_expr list *
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(mutable_flag * type_expr) Vars.t * type_expr
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val close_object: type_expr -> unit
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val set_object_name:
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type_expr -> type_expr list -> Ident.t -> unit
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val remove_object_name: type_expr -> unit
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val correct_abbrev: Env.t -> Ident.t -> type_expr list -> type_expr -> unit
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val unroll_abbrev: Ident.t -> type_expr list -> type_expr -> type_expr
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val is_generic: type_expr -> bool
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(* Test whether the given type variable is generic *)
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val arity: type_expr -> int
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(* Return the arity (as for curried functions) of the given type. *)
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val none: type_expr
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(* A dummy type expression *)
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exception Unify of (type_expr * type_expr) list
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exception Subtype of
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(type_expr * type_expr) list * (type_expr * type_expr) list
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exception Cannot_expand
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exception Nonlinear_abbrev
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exception Recursive_abbrev
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