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[Tom Tromey]

>>>>> "Jon" == Jonathan P Olson <olson@mmsi.com> writes:

Jon> Considering the 50% overhead I get with Java metadata, lossage
Jon> from GC seems miniscule.

You've mentioned the possibility of compressing this data.
We're accepting patches :-)
Or, failing that, if you have a definite plan we could at least add it
to the projects page.

Jon> To be actually useful for precise collection, you really need a
Jon> separate data structure containing a bit for each pointer in an
Jon> allocation.

I added code to gcc to use the previously unused vtable slot to hold a
bitmap description of the object.  Hans has changed the GC to use this
information.  Bryce has been working on integrating the two.

Tom