sq 3.9 compiledmethod #sourceClass and #methodClass

tim Rowledge tim at rowledge.org
Tue Oct 10 18:46:24 UTC 2006

On 10-Oct-06, at 3:03 AM, Marcus Denker wrote:
> But right now (when there is no super in it) those are all the same  
> method. (Methods are shared for saving
> space).
> So the solution would be to never share, allways copy. The  
> machinary now used for super send methods should
> be used for all methods, and we are done.

I concur - this seems like the proper answer for now.

> Space saving then can be added again after we make CompiledMethods  
> normal objects (with a ByteArray containing
> the Bytecode another array for the literals). Then these can be  
> shared to save space, while the Method itself will be
> a copy.


> The fun thing is that the CompiledMethod special treatment was done  
> to save space (rightly, there are lots of methods!).
> But then, when there is more RAM, people tend to like the idea of  
> trading RAM for more powerful abstractions. e.g having
> classes now their class and name. In the end, we are soon at a  
> point where the specia treatment of CompiledMethod does
> not save memory, but it costs memory for all the hacks build around  
> it to support what we would get for free if it would be
> a standard object... so having CompiledMethods be normal Objects is  
> definitly the right thing (which it was in 1998 already,
> I might add).
Definitely. I think we got stuck in analysis paralysis back then and  
never got organised enough to escape it.

> What should have been in in the 90ties would have been a "Squeak  
> revisited", a simplifcation and generalisation pass, based
> on the fact that the world was different in 1997 than it was in  
> 1977. A more simple and general system of course makes it much
> easier then to re-start hacking and experimenting (e.g. for eToys),  
> thus it is even the right thing to do from a "Kids first" perspective.
> That sadly never was done, work done in that direction was even  
> completely ignored and rejected.
Too true. But there's nothing (aside from real life...) getting in  
the way of doing it now. All we need is about $5m a year.

tim Rowledge; tim at rowledge.org; http://www.rowledge.org/tim
"How many Kdatlyno does it take to change a lightbulb?" "None. It  
sounds perfectly OK to them."

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