GNU bug report logs - #53260
char-syntax differs in interpreter and bytecode

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Mattias Engdegård <mattiase <at> acm.org>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#53260: closed (char-syntax differs in interpreter and bytecode)
Date: Thu, 20 Jan 2022 10:48:02 +0000

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Your message dated Thu, 20 Jan 2022 11:47:01 +0100
with message-id <748AD547-562F-495C-9BEC-D406953CFE4D <at> acm.org>
and subject line Re: bug#53260: char-syntax differs in interpreter and bytecode [PATCH]
has caused the debbugs.gnu.org bug report #53260,
regarding char-syntax differs in interpreter and bytecode
to be marked as done.

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From: Mattias Engdegård <mattiase <at> acm.org>
To: bug-gnu-emacs <at> gnu.org
Subject: char-syntax differs in interpreter and bytecode
Date: Fri, 14 Jan 2022 17:43:00 +0100

Fchar_syntax and the bytecode Bchar_syntax differ:

Fchar_syntax calls SETUP_BUFFER_SYNTAX_TABLE. Bchar_syntax does not.
Bchar_syntax converts arguments to multibyte. Fchar_syntax does not.

The last property can be used to get different behaviour:

(let ((cs (byte-compile (lambda (x) (char-syntax x)))))
  (with-temp-buffer
    (let ((st (make-syntax-table)))
      (set-buffer-multibyte nil)
      (modify-syntax-entry 128 "_" st)
      (set-syntax-table st)
      (list (funcall cs 128) (char-syntax 128)))))
-> (119 95)

Not sure how to expose the presence or absence of SETUP_BUFFER_SYNTAX_TABLE. Suggestions?

And, most importantly, what would be the correct code?

(I suppose char-syntax is rare enough that we could call Fchar_syntax from Bchar_syntax and thus avoid any future divergence.)

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From: Mattias Engdegård <mattiase <at> acm.org>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: Stefan Monnier <monnier <at> iro.umontreal.ca>, 53260-done <at> debbugs.gnu.org
Subject: Re: bug#53260: char-syntax differs in interpreter and bytecode [PATCH]
Date: Thu, 20 Jan 2022 11:47:01 +0100

20 jan. 2022 kl. 10.30 skrev Lars Ingebrigtsen <larsi <at> gnus.org>:

> Makes sense to me.  Unless Stefan has any further comments, please go
> ahead and push.

Thank you, pushed with a necessary modification: SETUP_BUFFER_SYNTAX_TABLE() is indeed necessary in Fchar_syntax because syntax.c has its own local #define SYNTAX() and doesn't use the one in syntax.h. Lovely.

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