Function call_through_pointer 

pub fn call_through_pointer<'w, P, O, S, X>(
    x: &mut X,
    pointer: P,
    args: &[CallArg<P, O>],
    returning: Option<P>,
    pos: Pos,
) -> Result<(), Abend>
where
    P: Copy,
    X: OoHost<'w, P, O, S>,

CALL through a FUNCTION-POINTER or PROCEDURE-POINTER: a JNI service from the function table, run here when it needs no JVM. Each argument is Value or Omitted, OMITTED as NULL. The reference services keep the JNI’s rules for local and global references (see LOCAL_FRAMES).