From: Gregory Heytings <gregory@heytings.org>
To: Eli Zaretskii <eliz@gnu.org>
Cc: philipk@posteo.net, michael_heerdegen@web.de,
mail@daniel-mendler.de, rpluim@gmail.com,
monnier@iro.umontreal.ca, 62009@debbugs.gnu.org,
arstoffel@gmail.com
Subject: bug#62009: 29.0.60; Emacs crashes on setf symbol-name
Date: Sat, 18 Mar 2023 22:46:35 +0000 [thread overview]
Message-ID: <d3c4377ed5a14521538a@heytings.org> (raw)
In-Reply-To: <831qlvwb83.fsf@gnu.org>
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>
> I think being a bit vague here and talking about "dangers" should be
> good enough, since not every such code will crash, and probably also not
> on every platform and in every build configuration.
>
Is the attached patch okay?
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[-- Attachment #2: Improve-warning-about-changing-the-string-returned-b.patch --]
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From 32f0fe0aa5fce7fd71f80a166676ef3e5f1e7b32 Mon Sep 17 00:00:00 2001
From: Gregory Heytings <gregory@heytings.org>
Date: Sat, 18 Mar 2023 22:41:33 +0000
Subject: [PATCH] Improve warning about changing the string returned by
symbol-name
* src/data.c (Fsymbol_name): Add warning.
* doc/lispref/symbols.texi (Creating Symbols): Improve warning.
---
doc/lispref/symbols.texi | 5 ++---
src/data.c | 5 ++++-
2 files changed, 6 insertions(+), 4 deletions(-)
diff --git a/doc/lispref/symbols.texi b/doc/lispref/symbols.texi
index 5b53cbe310a..c6a0408abd1 100644
--- a/doc/lispref/symbols.texi
+++ b/doc/lispref/symbols.texi
@@ -276,9 +276,8 @@ Creating Symbols
@end group
@end example
-@strong{Warning:} Changing the string by substituting characters does
-change the name of the symbol, but fails to update the obarray, so don't
-do it!
+@strong{Warning:} Never alter the string returned by that function.
+Doing that might make Emacs dysfunctional, and might even crash Emacs.
@end defun
@cindex uninterned symbol, and generating Lisp code
diff --git a/src/data.c b/src/data.c
index 0f1d881e00b..930d476bc3f 100644
--- a/src/data.c
+++ b/src/data.c
@@ -773,7 +773,10 @@ DEFUN ("symbol-plist", Fsymbol_plist, Ssymbol_plist, 1, 1, 0,
}
DEFUN ("symbol-name", Fsymbol_name, Ssymbol_name, 1, 1, 0,
- doc: /* Return SYMBOL's name, a string. */)
+ doc: /* Return SYMBOL's name, a string.
+
+Warning: never alter the string returned by `symbol-name'.
+Doing that might make Emacs dysfunctional, and might even crash Emacs. */)
(register Lisp_Object symbol)
{
register Lisp_Object name;
--
2.39.0
next prev parent reply other threads:[~2023-03-18 22:46 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-06 19:26 bug#62009: 29.0.60; Emacs crashes on setf symbol-name Daniel Mendler
2023-03-07 4:40 ` Ruijie Yu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-03-07 15:45 ` Michael Heerdegen
2023-03-07 17:08 ` Daniel Mendler
2023-03-07 17:39 ` Eli Zaretskii
2023-03-09 21:11 ` Philip Kaludercic
2023-03-10 7:11 ` Eli Zaretskii
2023-03-10 8:45 ` Augusto Stoffel
2023-03-10 8:47 ` Augusto Stoffel
2023-03-10 11:50 ` Eli Zaretskii
2023-03-10 12:00 ` Daniel Mendler
2023-03-10 12:35 ` Eli Zaretskii
2023-03-10 12:45 ` Daniel Mendler
2023-03-10 12:57 ` Eli Zaretskii
2023-03-10 13:08 ` Daniel Mendler
2023-03-10 15:02 ` Eli Zaretskii
2023-03-11 15:16 ` Gregory Heytings
2023-03-11 15:37 ` Eli Zaretskii
2023-03-18 22:46 ` Gregory Heytings [this message]
2023-03-19 6:03 ` Eli Zaretskii
2023-03-19 21:20 ` Gregory Heytings
2023-03-10 11:49 ` Eli Zaretskii
2023-03-10 9:40 ` Gregory Heytings
2023-03-10 10:31 ` Daniel Mendler
2023-03-10 10:59 ` Gregory Heytings
2023-03-10 11:09 ` Daniel Mendler
2023-03-10 11:23 ` Augusto Stoffel
2023-03-10 12:09 ` Eli Zaretskii
2023-03-10 11:30 ` Robert Pluim
2023-03-10 11:36 ` Daniel Mendler
2023-03-10 12:13 ` Eli Zaretskii
2023-03-10 12:24 ` Daniel Mendler
2023-03-10 22:01 ` Dmitry Gutov
2023-03-10 11:57 ` Gregory Heytings
2023-03-10 12:12 ` Eli Zaretskii
2023-03-10 13:19 ` Robert Pluim
2023-03-11 7:07 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-03-13 8:07 ` Robert Pluim
2023-03-13 8:28 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-03-13 11:47 ` Eli Zaretskii
2023-03-13 11:50 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-03-13 11:46 ` Eli Zaretskii
2023-03-10 11:59 ` Eli Zaretskii
2023-03-10 11:53 ` Eli Zaretskii
2023-03-10 11:59 ` Gregory Heytings
2023-03-11 7:07 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-03-11 7:47 ` Eli Zaretskii
2023-03-10 18:56 ` Philip Kaludercic
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