GNU bug report logs - #62009
29.0.60; Emacs crashes on setf symbol-name

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From: Gregory Heytings <gregory <at> heytings.org>
To: Daniel Mendler <mail <at> daniel-mendler.de>
Cc: Philip Kaludercic <philipk <at> posteo.net>, michael_heerdegen <at> web.de, monnier <at> iro.umontreal.ca, 62009 <at> debbugs.gnu.org, Eli Zaretskii <eliz <at> gnu.org>, Augusto Stoffel <arstoffel <at> gmail.com>
Subject: bug#62009: 29.0.60; Emacs crashes on setf symbol-name
Date: Fri, 10 Mar 2023 10:59:03 +0000

>
> Creating a string is not a good idea since it will lead to an 
> unacceptably large performance overhead.
>

Is "symbol-name" a function that is used in performance-critical code? 
And did you actually measure that performance overhead before concluding 
that it it "unacceptably large"?  According to my measurements, creating a 
string from a symbol name costs about 100 CPU cycles.

>
> Raising an exception upon modification would be the best approach.
>

That would also come with a performance overhead, as there is currently no 
way to distinguist strings that are used for symbol names from other 
strings.  Not to mention the added complexity in the code.

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