Re: Stacking data structures

[bmorris@xxxxxxxxxx]

>From: rob@dekko.com
>Date: Tue, 18 Sep 2001 10:27:54 -0500
>
>     D pOBJL0100       S               *   Inz(%addr(OBJL0100D))
>     D pOBJL0200       S               *   Inz(%addr(OBJL0200D))
>     D OBJL0200        DS                  Based(pOBJL0200)
>     D  OBJL0100D                          Like(OBJL0100)
>     D pOBJL0300       S               *
>     D OBJL0300        DS                  Based(pOBJL0300)
>     D  OBJL0200D                          Like(OBJL0200)
>
>But, when we compile this we get
>
> Msg id  Sv Number Seq     Message text
>*RNF0314 20      7 000200+ Built-in function %ADDR(OBJL0100D) does not
have
>a value known at compile-time; built-in function is ignored.
>
>I)  Should I try reporting this as a bug?
>II)  Any suggested workarounds?

I) No.  The compiler doesn't think %ADDR(based-variable) is a
value known at compile time, even if that based-variable's basing
pointer is explicitly initialized.  But in your case, the address
of OBJL0200D is the value of basing pointer pOBJL0300 which is
initialized (by default) to *NULL.

II) I would code it like this:

D OBJLstorage     S          32767A
D pOBJLstorage    S               *   inz(%addr(OBJLstorage))

D OBJL0100        DS                  based(pOBJLstorage)
D   subfields...

D OBJL0200        DS                  based(pOBJLstorage)
D   subfields...

An alternative to declaring such a big chunk of storage is to
declare a small one, and check the bytes-received vs bytes-available
after you call the API.  If you didn't get all the data, use ALLOC
to allocate more storage for your basing pointer.  (Remembering to
DEALLOC your storage later if the pointer isn't still pointing to
the small declared storage.)

Barbara Morris