> On Jan 16, 2015, at 12:04, Henrik Johansen <henrik.s.johan...@veloxit.no> > wrote: > > >> On 16 Jan 2015, at 1:25 , Johan Fabry <jfa...@dcc.uchile.cl> wrote: >> >> >> As I’ve been asked, I’ll clarify a bit more. When I said it worked before I >> was actually wrong because I had forgotten to remove some alternative >> cleanup code (the alternative works but it’s like using a cannon to kill a >> fly). >> >> This is part of the interpreter for Live Robot Programming that Miguel and I >> are working on. As part of that we need a data structure that holds scopes, >> for variables but also for other things. It turns out that for the variables >> part we can map rather nicely to classes, which gives us a bunch of >> advantages. So for each scope I generate a class. The scope keeps that class >> in a ‘vars’ instance variable (there are never any instances of these >> classes BTW). When the scope is garbage collected I want to remove the class >> from the system. So I put #finalize in the scope with the idea to remove the >> class, but it turns out that ‘vars’ is always nil. So in the end it did not >> work out ... > > You're probably registering the scope for finalization before setting the > vars insvar? > The shadow copy is made at the point of registration, so any subsequent > assignments to the scope's instvars is not accounted for.
Yes! Silly me :-/ that was the problem! Thanks for pointing it out! It’s still not perfect: when running the tests +-half of the generated classes are not removed, but maybe the test runner still holds some references. As I said before, I don’t have much time to spend on this … I will need to make some time to investigate more later. ---> Save our in-boxes! http://emailcharter.org <--- Johan Fabry - http://pleiad.cl/~jfabry PLEIAD lab - Computer Science Department (DCC) - University of Chile
