GNU bug report logs - #75754
styled_format stack usage/GC protection

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Package: emacs;

Reported by: Pip Cet <pipcet <at> protonmail.com>

Date: Wed, 22 Jan 2025 10:20:01 UTC

Severity: normal

Done: Pip Cet <pipcet <at> protonmail.com>

Bug is archived. No further changes may be made.

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From: Pip Cet <pipcet <at> protonmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 75754 <at> debbugs.gnu.org, eggert <at> cs.ucla.edu
Subject: bug#75754: styled_format stack usage/GC protection
Date: Wed, 22 Jan 2025 18:18:48 +0000

(setq print-unreadable-function
      (lambda (&rest args)
        (garbage-collect)
        (make-string 100 256 t)))

(message "%S" (format "%S %S" [1] (symbol-function '+)))

fails to print the initial "[1]" here. Changing 256 to ?A and t to nil
produces

"[1] AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"

GDB session confirms the bug is as I've described.

Pip
This bug report was last modified 162 days ago.

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