[Bug translator/14924] warn on complex $ptr->foo expressions in .return probes

["mcermak at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=14924

--- Comment #10 from Martin Cermak <mcermak at redhat dot com> ---
Created attachment 9630
  --> https://sourceware.org/bugzilla/attachment.cgi?id=9630&action=edit
possible patch

First round of full testing and fixes.  ITSM there is now a slight syntactical
issue with @defined in return probes:  What was earlier easily expressible like
e.g. this:

=======
        if (@defined($s)) {
                bytes_req = $s->size
                ...
        }
        else
        ...
=======

does now probably need following handling:

=======
        if (@entry(@defined($s))) {
                bytes_req = @entry(@choose_defined($s->size, 0))
                ...
        }
        else
        ...
=======

I'm not sure I like this, because it's not syntactically terse enough, and it
requires a "default" value which possibly can cause collisions.  Thoughts?

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