Bert Freudenberg wrote:
> 
> Am 17.09.2008 um 07:47 schrieb Paolo Bonzini:
> 
>> Keith Hodges wrote:
>>>  I tried normalizing object
>>> pointers to a known base address as a starting point.
>> Changing the base address might make loading slower.
> 
> Actually, it makes it faster.

Yes, but that address might vary between systems.  I interpreted Keith's
sentence as "normalizing the base address to zero", not to something
that is likely to be available the next time around.

If the VM saves the objects with the current base address, it would
probably choose an address that is likely to be available the next time
around, but it might be different from what is under version control.

Anyway, with direct object access (no OOP table) there is a fundamental
problem that makes diff encoding of images almost impossible.  If an
object dies, everything after it is compacted and changes its address.
If you have an OOP table, the objects are referenced through something
that is never compacted, but if objects are accessed directly then every
pointer in the image is changing.

Paolo