(**************************************************************************)
(*     Sail                                                               *)
(*                                                                        *)
(*  Copyright (c) 2013-2017                                               *)
(*    Kathyrn Gray                                                        *)
(*    Shaked Flur                                                         *)
(*    Stephen Kell                                                        *)
(*    Gabriel Kerneis                                                     *)
(*    Robert Norton-Wright                                                *)
(*    Christopher Pulte                                                   *)
(*    Peter Sewell                                                        *)
(*    Alasdair Armstrong                                                  *)
(*    Brian Campbell                                                      *)
(*    Thomas Bauereiss                                                    *)
(*    Anthony Fox                                                         *)
(*    Jon French                                                          *)
(*    Dominic Mulligan                                                    *)
(*    Stephen Kell                                                        *)
(*    Mark Wassell                                                        *)
(*                                                                        *)
(*  All rights reserved.                                                  *)
(*                                                                        *)
(*  This software was developed by the University of Cambridge Computer   *)
(*  Laboratory as part of the Rigorous Engineering of Mainstream Systems  *)
(*  (REMS) project, funded by EPSRC grant EP/K008528/1.                   *)
(*                                                                        *)
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(*  modification, are permitted provided that the following conditions    *)
(*  are met:                                                              *)
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(*     distribution.                                                      *)
(*                                                                        *)
(*  THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''    *)
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(*  SUCH DAMAGE.                                                          *)
(**************************************************************************)

open Ast
open Ast_defs
open Ast_util
open Type_check

(** [const_prop defs ref_vars substs assigns exp] performs constant propagation
    on [exp] where [substs] is a pair of substitutions on immutable variables
    and type variables, [assigns] is a substitution on mutable variables, and
    [ref_vars] is the set of variable which may have had a reference taken
    (and hence we cannot reliably track). *)

val const_prop :
  string ->
  tannot ast ->
  IdSet.t ->
  tannot exp Bindings.t * nexp KBindings.t ->
  tannot exp Bindings.t ->
  tannot exp ->
  tannot exp * tannot exp Bindings.t

val referenced_vars : tannot exp -> IdSet.t

val remove_impossible_int_cases : 'a -> tannot ast -> tannot ast