[rvm-research] Storing of a start-address in allocation process

Hey there,
is there a way to store the start-address of an array in its allocation 
process?
When an array gets allocated into the heap with bump-pointer allocation, 
it is done via the method alloc() in BumpPointer.
In there the start-address gets calculated. If I store this address into 
a field, this address somtimes is zero and on other occasions the VM 
crashes if I try to access it.

Thanks and best regards,
Hannes