[fpc-devel] Improving Ref Counting

[Jamie McCracken]

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.

jamie.