[Newcompiler] What compiler is used when debugger needs line information

[Marcus Denker]

On 29.05.2007, at 14:06, Klaus D. Witzel wrote:

> List,
>
> in an offline email thread (with Stef, Roel, Damien and Math) about
> optimizations which could be done by Smalltalk compiler, we  
> mentioned the
> debugger needs information which is not in the bytecodes of a method.
>
> Imagine a method X was compiled with the new compiler and then the
> preference is reset for using the old compiler. Now when X is  
> debugged,
> the debugger compiles X's source code for obtaining source code  
> positions
> (line information).
>
> It is quite possible this information no longer matches the method  
> (both
> compilers can produce quite different bytecodes).
>
> How's that handled now?
>

It is just not handled right now. I do not know if we really need to  
have a solution
for this: The idea is to replace the old compiler, not have an  
environment where
both can be used together.

We could add a property to the methods compiled either with the old  
or with the new
compiler, and then switch to the right decompiler. But that would  
cost some space
(property for all these methods) for not beeing really used... when  
would a complete
mix of both methods happen? Now that we develop it, yes. So if we see  
that it really
annoys us, we could add this. If not, we don't need to, as the goal  
is to not have any
system with mixed methods in the future.

	Marcus
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