Question about dependency functions in the backend

Hi,

I was wondering whether there is a backend function to help finding the
dependencies on a relation.column inside pg_depend. Something like
dependency.c:0255:findAutoDeletableObjects also taking the "refobjsubid"
with the search. This I ask in order to avoid reinventing the wheel :)

Perhaps the "findAutoDeletableObjects" could be used but the function
name is confusing.

Thanks.