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bug#62009: 29.0.60; Emacs crashes on setf symbol-name
From: |
Augusto Stoffel |
Subject: |
bug#62009: 29.0.60; Emacs crashes on setf symbol-name |
Date: |
Fri, 10 Mar 2023 12:23:54 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) |
On Fri, 10 Mar 2023 at 12:09, Daniel Mendler wrote:
> On 3/10/23 11:59, Gregory Heytings wrote:
>> 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.
>
> One could check if the string is located in read-only memory. Or one
> could add a flag bit to the string data structure (and possibly to other
> data structures too). Freezing data structures such that they become
> read-only is a generally useful feature. There won't be any performance
> overhead of the check since a branch not taken is fast thanks to the
> branch predictor.
Note also that in-place modification of strings is arbitrarily costly,
cf. (aset "ascii" 0 ?😼). Not to mention that it's rarely a good or
necessary move to make, as far as programming style is concerned.
- bug#62009: 29.0.60; Emacs crashes on setf symbol-name, (continued)
- bug#62009: 29.0.60; Emacs crashes on setf symbol-name, Eli Zaretskii, 2023/03/10
- bug#62009: 29.0.60; Emacs crashes on setf symbol-name, Daniel Mendler, 2023/03/10
- bug#62009: 29.0.60; Emacs crashes on setf symbol-name, Eli Zaretskii, 2023/03/10
- bug#62009: 29.0.60; Emacs crashes on setf symbol-name, Daniel Mendler, 2023/03/10
- bug#62009: 29.0.60; Emacs crashes on setf symbol-name, Eli Zaretskii, 2023/03/10
- bug#62009: 29.0.60; Emacs crashes on setf symbol-name, Eli Zaretskii, 2023/03/10
- bug#62009: 29.0.60; Emacs crashes on setf symbol-name, Gregory Heytings, 2023/03/10
- bug#62009: 29.0.60; Emacs crashes on setf symbol-name, Daniel Mendler, 2023/03/10
- bug#62009: 29.0.60; Emacs crashes on setf symbol-name, Gregory Heytings, 2023/03/10
- bug#62009: 29.0.60; Emacs crashes on setf symbol-name, Daniel Mendler, 2023/03/10
- bug#62009: 29.0.60; Emacs crashes on setf symbol-name,
Augusto Stoffel <=
- bug#62009: 29.0.60; Emacs crashes on setf symbol-name, Eli Zaretskii, 2023/03/10
- bug#62009: 29.0.60; Emacs crashes on setf symbol-name, Robert Pluim, 2023/03/10
- bug#62009: 29.0.60; Emacs crashes on setf symbol-name, Daniel Mendler, 2023/03/10
- bug#62009: 29.0.60; Emacs crashes on setf symbol-name, Eli Zaretskii, 2023/03/10
- bug#62009: 29.0.60; Emacs crashes on setf symbol-name, Daniel Mendler, 2023/03/10
- bug#62009: 29.0.60; Emacs crashes on setf symbol-name, Dmitry Gutov, 2023/03/10
- bug#62009: 29.0.60; Emacs crashes on setf symbol-name, Gregory Heytings, 2023/03/10
- bug#62009: 29.0.60; Emacs crashes on setf symbol-name, Eli Zaretskii, 2023/03/10
- bug#62009: 29.0.60; Emacs crashes on setf symbol-name, Robert Pluim, 2023/03/10
- bug#62009: 29.0.60; Emacs crashes on setf symbol-name, Po Lu, 2023/03/11