GraalIR Virtual nodes

[Juan Fumero]

Hi all, 
    I am working with FastR and I am analyzing the GraalIR after the
Partial Evaluation. I have a question concerning virtual nodes in the
Graal IR. What do they represent? Are they considered as
FloatingNodes? 

For instance, for a simple R expression:

<code>
f <- function(x) x * 2.0;
</code>

I see nodes such as VirtualArray, VirtualObjectState or VirtualBoxing.

Thanks
Juan

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