Frama-C API - JOIN_SEMILATTICE
val bottom : t
Must verify that forall a, join a bottom = a.
Must verify: a is_included b <=> a join b = b. The dataflow does not require this function.
This function is used by the dataflow algorithm to determine if something has to be recomputed. Joining and inclusion testing are similar operations, so it is often more efficient to do both at the same time (e.g. when joining with bottom).
Instead of defining it directly, it can be defined from join and equal, or from is_included, for instance by if is_included new old then (true,old) else (false, join old new)
or let j = join old new in (equal j new, j)
.
val pretty : Stdlib.Format.formatter -> t -> unit
Display the contents of an element of the lattice.