we really need help
daniel.vainsencher at gmail.com
Tue Oct 11 05:58:51 UTC 2005
Actually, this is exactly the kind of problem I was having with
bootstrapping Traits. In that case it seemed like a pretty freak
occurance (changing how methods are added), and wasn't worth
implementing the general solutions, so Adrian and I went the route of
creating several versions that load stuff in order.
But both I and Avi proposed general solutions, and from the case you're
presenting now, it seems the problem might be common enough to warrant
implementing one of them.
I'll describe the two solutions, since I'm not yet sure what the
1. Have the loader sort the methods.
2. Do an atomic change of the method dictionaries
The first: the loader already loads classes superclass-first, for the
obvious reasons. So we can tell it to sort the methods also - if
Foo>>bar calls #baz, load all implementations of #baz before loading
Foo>>bar. Of course this won't always work, because two methods can be
mutually recursive, but that's rare.
The second: have the loader apply all changes to copies of the method
dictionaries of the classes. Then atomically swap in the modified copies
instead of the old ones. I guess this means to purge all caches and do
an array-become. This requires vm knowledge to know whether it will
require anything else.
What do you guys think?
Marcus Denker wrote:
> Sadly I really have no time to work on Monticello... or even to look at
> the current state too much. So no idea for that problem.
> For sure, we need to get the whole mess working soon.... I will try to
> some time, but I fear that this will need to wait till I'm settled in
> so maybe end of next week.
>> I tried to tweak a bit the script by loading first kernel-md.42.mcz
>> take a 6693 image
>> - merge MC275
>> - scriptloader-sd.8.mcz
>> script 6
>> - but now I get an error because Debugger does not know stepAt:in:
> This is caused by the fact that #stepAt:in: has been moved to the morphic
> package, so just loading "kernel" will delete that method.
More information about the Packages