
[Christian]
When I look into tracebacks, it turns out to be just a chain like the frame chain, but upward down. It holds references to the frames in a 1-to-1 manner, and it keeps copies of f->f_lasti and f->f_lineno. I don't see why this is needed. ... Does this make sense? Do I miss something?
[Guido]
Yes. It is quite possible to have multiple stack traces lingering around that all point to the same stack frames.
This reminds me that some time ago I made an experimental patch for removing SET_LINENO. There was the problem of generating callbacks for pdb (which I think I solved somehow but I don't remember the details). I do remember that I had to look at pdb again for some reason. Is there any interest in reviving this idea? -- Vladimir MARANGOZOV | Vladimir.Marangozov@inrialpes.fr http://sirac.inrialpes.fr/~marangoz | tel:(+33-4)76615277 fax:76615252