(*
 * Copyright (c) 2016 - 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

(** Single abstraction for all the kinds of variables in SIL *)

type t = LogicalVar of Ident.t | ProgramVar of Pvar.t [@@deriving compare]

let equal = [%compare.equal : t]

let of_id id = LogicalVar id

let of_pvar pvar = ProgramVar pvar

let of_formal_index formal_index = of_id (Ident.create_footprint Ident.name_spec formal_index)

let to_exp = function ProgramVar pvar -> Exp.Lvar pvar | LogicalVar id -> Exp.Var id

let is_global = function ProgramVar pvar -> Pvar.is_global pvar | LogicalVar _ -> false

let is_return = function ProgramVar pvar -> Pvar.is_return pvar | LogicalVar _ -> false

let is_footprint = function ProgramVar _ -> false | LogicalVar id -> Ident.is_footprint id

let pp fmt = function ProgramVar pv -> Pvar.pp Pp.text fmt pv | LogicalVar id -> Ident.pp fmt id

module Map = PrettyPrintable.MakePPMap (struct
  type nonrec t = t

  let compare = compare

  let pp = pp
end)