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bug#25295: 26.0.50; Represent eieio objects using object-print in backtr

From: npostavs
Subject: bug#25295: 26.0.50; Represent eieio objects using object-print in backtraces and edebug
Date: Thu, 02 Mar 2017 07:52:18 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.2 (gnu/linux)

Stefan Monnier <address@hidden> writes:
> My experiments seem to indicate that it might
> be "good enough" but it might also suffer from the overhead of
> cl-generic (mostly the fact that a call to a generic-function ends up
> going through some &rest+apply which in cl-print's case end up
> generating a lot of garbage: in one of my tests, the cl-print code was
> twice slower than the C code but the added time was almost entirely
> spent in the GC and that seemed to come exclusively from the lists
> allocated for &rest.  I.e. if we could change cl-generic so it doesn't
> use &rest+apply as much there's a chance it could potentially be about
> as fast as the C code).

I have an idea to use this for the pretty printer so it that produces
the correct spacing while printing.  I think this would end up faster
than calling indent-sexp afterwards.  But it would involve dispatching
on STREAM, and according to the comments in cl-generic.el multiple
dispatch adds more apply calls.  Thoughts?

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