(*
 * Copyright (c) 2013 - present Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *)

open! IStd

(** Eradicate NPEs. *)

val callback_eradicate : Callbacks.proc_callback_t

val callback_check_return_type : TypeCheck.check_return_type -> Callbacks.proc_callback_t


(** Parameters of a call. *)
type parameters = (Exp.t * Typ.t) list


(** Type for a module that provides a main callback function *)
module type CallBackT =
sig
  val callback : TypeCheck.checks -> Callbacks.proc_callback_args -> unit
end (* CallBackT *)


(** Extension to the type checker. *)
module type ExtensionT = sig
  type extension
  val ext : extension TypeState.ext
  val update_payload : extension TypeState.t option -> Specs.payload -> Specs.payload
end

(** Given an extension to the typestate with a check, call the check on each instruction. *)
module Build (Extension : ExtensionT) : CallBackT