Re: [patch] Move loop structures to gc memory

["Daniel Berlin" <dberlin at dberlin dot org>]

On 5/13/07, Richard Guenther <richard.guenther@gmail.com> wrote:
> On 5/13/07, Zdenek Dvorak <rakdver@kam.mff.cuni.cz> wrote:
> > Hello,
> >
> > all the loop structures are now malloc-ed.  Since trees may be
> > referenced from the loop structures, this prevents garbage collection
> > from being run while loop structures are present.  This is going to be
> > impossible once we preserve the loop information across larger portion
> > of middle-end.
> >
> > This patch makes all loop structures gc-allocated.
>
> I suppose it is not possible (or practicable) to mark these references
> as new GC roots?

This is one of the many deficiencies of our GC.  There is no way to
mark roots that are not in GC memory, so anything pointing to anything
gc'd has to be GC'd itself :(

Otherwise, the marking code just crashes.