[Libre-soc-bugs] [Bug 1094] insndb instruction database visitor-walker is needed

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=1094

--- Comment #103 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Dmitry Selyutin from comment #96)
> class VisitorMeta(type):
>     def __init__(cls, name, bases, ns):
>         cls.__registry = {}
>         return super().__init__(cls)

this is placing the registry in *VisitorMeta*.
it needed to be the other way round:

        x = super().__new__(cls, name, bases, dct)
        x.registry = collections.defaultdict
        return x

(remember also to pass *all* the arguments to type() otherwise it will
 (a) have no base classes (b) have no functions... i mean *maybe* this
 is good? doesn't seem like it, given that there are other functions
 in VisitorMeta)

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