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(************************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * CNRS-Ecole Polytechnique-INRIA Futurs-Universite Paris Sud *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(************************************************************************)
(* Certification of Imperative Programs / Jean-Christophe Filliâtre *)
(* $Id: prename.mli,v 1.1.16.1 2004/07/16 19:30:05 herbelin Exp $ *)
open Names
(* Abstract type for renamings
*
* Records the names of the mutables objets (ref, arrays) at the different
* moments of the evaluation, called dates
*)
type t
type date = string
val empty_ren : t
val update : t -> date -> identifier list -> t
(* assign new names for the given variables, associated to a new date *)
val next : t -> identifier list -> t
(* assign new names for the given variables, associated to a new
* date which is generated from an internal counter *)
val push_date : t -> date -> t
(* put a new date on top of the stack *)
val valid_date : date -> t -> bool
val current_date : t -> date
val all_dates : t -> date list
val current_var : t -> identifier -> identifier
val current_vars : t -> identifier list -> (identifier * identifier) list
(* gives the current names of some variables *)
val avoid : t -> identifier list -> t
val fresh : t -> identifier list -> (identifier * identifier) list
(* introduces new names to avoid and renames some given variables *)
val var_at_date : t -> date -> identifier -> identifier
(* gives the name of a variable at a given date *)
val vars_at_date : t -> date -> identifier list
-> (identifier * identifier) list
(* idem for a list of variables *)
(* pretty-printers *)
val pp : t -> Pp.std_ppcmds
val ppr : t -> unit
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