[fpc-devel] Proof of Concept ARC implementation

[Jonas Maebe]

On 27 Oct 2014, at 11:10, Sven Barth wrote:

> A third possiblity would be to implement a cycle detector in the  
> decrement helper, but I haven't come around that for now as I wanted  
> to get a first rough implementation out to you all ;)

I think that a cycle detector should be an independent component, just  
like heaptrc is an independent add-on to detect memory problems in  
regular programs.

Additionally, as mentioned before, I still believe it's a very bad  
idea to be able to inherited from a regular class and turn it into a  
reference counted class. Reference counted and non-reference-counted  
classes are different language entities with different behaviour and  
different code generation requirements, and hence should be completely  
unrelated.

Even if you completely forbid typecasting a reference counted class  
into a non-reference-counted parent class, simply calling an inherited  
method from a non-reference-counted parent class can easily completely  
mess up the reference counting (e.g. suppose that inherited method  
inserts "self" into a linked list).


Jonas

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