Re: bug#24514: 24.5; Lispy backtraces

[Eli Zaretskii]

> From: Clément Pit--Claudel <address@hidden>
> Date: Sat, 3 Dec 2016 17:15:22 -0500
> 
> On 2016-12-01 21:24, Stefan Monnier wrote:
> >> The discussion below seems to indicate that there's very little missing at
> >> the Lisp level to be able to implement `backtrace' in Lisp; is that right?
> > 
> > Indeed, I think all the info needed is provided by backtrace-frame.
> 
> The C implementation of backtrace-frame seems to be linear in the index of 
> the requested frame, so a Lisp implementation of backtrace would be quadratic 
> in the depth of the stack trace.  Would a new function backtrace-frames that 
> returns all frames at once be acceptable?

But such a backtrace-frames function would have to be implemented in
C, right?  And you wanted to move the implementation of "backtrace" to
Lisp, AFAIU.  So it sounds like we will be replacing one C primitive
with another, or did I miss something?