[fpc-devel] Improving Ref Counting

[Marco van de Voort]

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> Marco van de Voort wrote:
> >>circular refs should also be done if applicable)
> >>6) Whenever an exception is thrown, wait until its either handled or 
> >>fully propagated and then perform some garbage collection. (traverse the 
> >>single linked list of all managed objects and for each object check 
> >>whether anything that references it is still valid and delete if 
> >>appropriate).
> > 
> > 
> > I also thought immediately what Uberto already said: how do you recognize
> > a valid/invalid reference without accessing memory that is invalid in the mean
> > time.
> > 
> 
> Another possibility is for the exception handling to Null the pointers 
> on the stack if its not handled in the current subroutine.

And that will have to be guarded in a try..finally, so we are back....