sig
type data
val clear : unit -> unit
val mem : Cil_types.stmt -> bool
val find : Cil_types.stmt -> Dataflow2.StmtStartData.data
val replace : Cil_types.stmt -> Dataflow2.StmtStartData.data -> unit
val add : Cil_types.stmt -> Dataflow2.StmtStartData.data -> unit
val iter : (Cil_types.stmt -> Dataflow2.StmtStartData.data -> unit) -> unit
val length : unit -> int
end