Module `IR.Subtype`

module F = Stdlib.Format

type t

val compare : t -> t -> int
val equal : t -> t -> bool

val pp : F.formatter -> t -> unit
val exact : t
val subtypes : t: denotes the current type only

val subtypes_cast : t: denotes the current type and any subtypes

val subtypes_instof : t

val join : t -> t -> t

val case_analysis : Tenv.t -> (Typ.Name.t * t) -> (Typ.Name.t * t) -> t option * t option

case_analysis tenv (c1, st1) (c2, st2) performs case analysis on c1 <: c2 according to st1 and st2. case_analysis returns a pair:

whether st1 and st2 admit c1 <: c2, and in case returns the updated subtype st1
whether st1 and st2 admit not(c1 <: c2), and in case returns the updated subtype st1

val is_known_subtype : Tenv.t -> Typ.Name.t -> Typ.Name.t -> bool: is_known_subtype tenv c1 c2 returns true if there is enough information in tenv to prove that c1 is a subtype of c2. Note that not (is_known_subtype tenv c1 c2) == true does not imply that is_known_not_subtype tenv c1 c2 == true

val is_cast : t -> bool
val is_instof : t -> bool
val equal_modulo_flag : t -> t -> bool: equality ignoring flags in the subtype