GNU bug report logs - #25295
26.0.50; Represent eieio objects using object-print in backtraces and edebug

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Message #46 received at 25295 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Eric Abrahamsen <eric <at> ericabrahamsen.net>
Cc: 25295 <at> debbugs.gnu.org
Subject: Re: bug#25295: Represent eieio objects using object-print in
 backtraces and edebug
Date: Wed, 04 Jan 2017 23:37:26 -0500

> Actually, print.c is already setup to be (at least partially) reentrant
> (for the case `printcharfun` is a function), so maybe making it fully
> reentrant won't be too hard.  But we'd still want to provide some ad-hoc
> prin1-like function which continues the print job rather than starting
> a new nested one; this is needed e.g. if the custom printer wants to
> print a value V but V has already been printed so it should be printed
> as a reference #NN# to the previous one.

Looking further at the code, maybe this isn't even needed, since the
print-number-table can survive calls to print.  But that can get ugly
when your printer code also want to call `print` for "unrelated"
purposes (e.g. to print debug messages in a side buffer).
And I'll stop thinking about interaction with concurrency.


        Stefan

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