Re: Interactive parsing with Bison

[Hans Aberg]

On 27 Jun 2006, at 12:35, Richard Stallman wrote:

> > normally
> >     has several symbols on the same line. So here, one needs an arrow
> >     pointing between the grammar symbols of each active rule.
> >
> > We could surely modify GDB and gdb-ui.el to do that.
>
>     It could be that this feature is useful for C/C++ debugging as  
> well.
>
> That would require a lot more debugging info.  Right now the debugging
> info generated for C is just line numbers.  In practice that seems to
> work well enough.
>
> If debugging Bison grammars really needs this feature, then we can
> provide it and use it for debugging Bison grammars.  But we would not
> want to use it for C.

It just seems me too primitive that one should have to modify the  
source file, breaking the source code up on several lines just for  
debugging purposes. One idea that come to my mind, is that one would  
be enabled to provide an optional input debug file, detailing what  
debugging information should be generated. So if more debugging  
detail is needed in some segment, one puts that information into this  
debug input file instead of modifying the source file.

As for Bison .y debugging, that is on a higher level, and I think it  
would be too rude to not see the exact parsing position.

  Hans Aberg