Package: emacs;
Reported by: Divya Ranjan <divya <at> subvertising.org>
Date: Sat, 9 Nov 2024 16:06:01 UTC
Severity: normal
Found in version 30.0.91
Done: Stefan Monnier <monnier <at> iro.umontreal.ca>
Bug is archived. No further changes may be made.
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bug-gnu-emacs <at> gnu.org:bug#74281; Package emacs.
(Sat, 09 Nov 2024 16:06:01 GMT) Full text and rfc822 format available.Divya Ranjan <divya <at> subvertising.org>:bug-gnu-emacs <at> gnu.org.
(Sat, 09 Nov 2024 16:06:02 GMT) Full text and rfc822 format available.Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):
From: Divya Ranjan <divya <at> subvertising.org> To: bug-gnu-emacs <at> gnu.org Subject: 30.0.91; font-lock mode hangs on scrolling large Scheme file Date: Sat, 09 Nov 2024 16:04:13 +0000
1. 11ikjlkjkkkj 1. In emacs -Q, open a fairly big Scheme file (> 70k) and try to move in the file with C-n, C-f or mouse scrolling. It sverely lags for several seconds, doesn’t even respond to C-g. 2. Toggle font-lock-mode off through M-x, then try to scroll. It works as expected, no serious lags. 3. Running the profiler also shows font-lock as the culprit. This makes working on big projects, in my case the source code of GNU Guix distribution an impossible situation. I haven’t tried setting up (Guile) Scheme with Tree-Sitter, but shouldn’t simple syntax-highlighting be not a serious problem? To try a big Scheme file and reproduce this, open tex.scm in gnu/packages/tex.scm in Guix source tree: https://git.savannah.gnu.org/cgit/guix.git In GNU Emacs 30.0.91 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.41, cairo version 1.18.0) Windowing system distributor 'The X.Org Foundation', version 11.0.12101012 System Description: Guix System Configured using: 'configure CONFIG_SHELL=/gnu/store/3jhfhxdf6v5ms10x5zmnl166dh3yhbr1-bash-minimal-5.1.16/bin/bash SHELL=/gnu/store/3jhfhxdf6v5ms10x5zmnl166dh3yhbr1-bash-minimal-5.1.16/bin/bash --prefix=/gnu/store/k3vqb6f4ghi2v50zrzh3657dywfkyfc5-emacs-next-30.0.91-1.9a1c76b --enable-fast-install --with-cairo --with-modules --with-native-compilation=aot --disable-build-details' Configured features: ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES NATIVE_COMP NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS TREE_SITTER X11 XDBE XIM XINPUT2 XPM GTK3 ZLIB Important settings: value of $EMACSLOADPATH: /home/divya/.config/guix/current/share/emacs/site-lisp:/home/divya/.guix-home/profile/share/emacs/site-lisp:/home/divya/.guix-profile/share/emacs/site-lisp:/run/current-system/profile/share/emacs/site-lisp:/gnu/store/k3vqb6f4ghi2v50zrzh3657dywfkyfc5-emacs-next-30.0.91-1.9a1c76b/share/emacs/30.0.91/lisp value of $LANG: en_US.utf8 locale-coding-system: utf-8-unix Major mode: Dired/name 452/587 Minor modes in effect: all-the-icons-dired-mode: t erc-notify-mode: t erc-notifications-mode: t erc-track-mode: t erc-track-minor-mode: t erc-ring-mode: t erc-netsplit-mode: t erc-menu-mode: t erc-match-mode: t erc-list-mode: t erc-irccontrols-mode: t erc-move-to-prompt-mode: t erc-readonly-mode: t erc-imenu-mode: t erc-pcomplete-mode: t erc-button-mode: t erc-fill-mode: t erc-stamp-mode: t erc-autojoin-mode: t erc-networks-mode: t gcmh-mode: t global-corfu-mode: t corfu-mode: t global-paren-face-mode: t global-color-identifiers-mode: t global-hi-lock-mode: t hi-lock-mode: t timeclock-mode-line-display: t server-mode: t dirvish-peek-mode: t dirvish-side-follow-mode: t dirvish-override-dired-mode: t dired-hide-details-mode: t consult-org-roam-mode: t org-roam-db-autosync-mode: t winner-mode: t popper-mode: t meow-global-mode: t meow-mode: t meow-motion-mode: t meow-esc-mode: t display-time-mode: t dimmer-mode: t all-the-icons-completion-mode: t marginalia-mode: t vertico-mode: t global-writeroom-mode: t which-key-mode: t smartparens-global-mode: t doom-modeline-mode: t global-auto-revert-mode: t save-place-mode: t savehist-mode: t recentf-mode: t global-hl-line-mode: t global-display-line-numbers-mode: t override-global-mode: t straight-use-package-mode: t straight-package-neutering-mode: t tooltip-mode: t global-eldoc-mode: t show-paren-mode: t electric-quote-mode: t electric-indent-mode: t mouse-wheel-mode: t global-prettify-symbols-mode: t file-name-shadow-mode: t global-font-lock-mode: t font-lock-mode: t blink-cursor-mode: t minibuffer-regexp-mode: t buffer-read-only: t size-indication-mode: t column-number-mode: t line-number-mode: t global-visual-line-mode: t visual-line-mode: t indent-tabs-mode: t transient-mark-mode: t auto-composition-mode: t auto-encryption-mode: t auto-compression-mode: t Load-path shadows: /home/divya/.emacs.d/straight/build/compat/compat hides /gnu/store/5fz4hfsqgh2rgdz2gxpxsnf6ak2nbsnx-emacs-compat-30.0.0.0/share/emacs/site-lisp/compat-30.0.0.0/compat /home/divya/.emacs.d/straight/build/compat/compat-pkg hides /gnu/store/5fz4hfsqgh2rgdz2gxpxsnf6ak2nbsnx-emacs-compat-30.0.0.0/share/emacs/site-lisp/compat-30.0.0.0/compat-pkg /home/divya/.emacs.d/straight/build/compat/compat-macs hides /gnu/store/5fz4hfsqgh2rgdz2gxpxsnf6ak2nbsnx-emacs-compat-30.0.0.0/share/emacs/site-lisp/compat-30.0.0.0/compat-macs /home/divya/.emacs.d/straight/build/compat/compat-autoloads hides 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lisp-float-type elisp-mode mwheel term/x-win x-win term/common-win x-dnd touch-screen tool-bar dnd fontset image regexp-opt fringe tabulated-list replace newcomment text-mode lisp-mode prog-mode register page tab-bar menu-bar rfn-eshadow isearch easymenu timer select scroll-bar mouse jit-lock font-lock syntax font-core term/tty-colors frame minibuffer nadvice seq simple cl-generic indonesian philippine cham georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms cp51932 hebrew greek romanian slovak czech european ethiopic indian cyrillic chinese composite emoji-zwj charscript charprop case-table epa-hook jka-cmpr-hook help abbrev obarray oclosure cl-preloaded button loaddefs theme-loaddefs faces cus-face macroexp files window text-properties overlay sha1 md5 base64 format env code-pages mule custom widget keymap hashtable-print-readable backquote threads dbusbind inotify lcms2 dynamic-setting system-font-setting font-render-setting cairo gtk x-toolkit xinput2 x multi-tty move-toolbar make-network-process native-compile emacs) Memory information: ((conses 16 1569808 2032077) (symbols 48 77987 11) (strings 32 393425 106016) (string-bytes 1 17866520) (vectors 16 167276) (vector-slots 8 2824657 579009) (floats 8 2970 25080) (intervals 56 20041 6581) (buffers 992 63)) -- Divya Ranjan, Philosophy, Mathematics, Libre Software.
bug-gnu-emacs <at> gnu.org:bug#74281; Package emacs.
(Thu, 14 Nov 2024 08:45:02 GMT) Full text and rfc822 format available.Message #8 received at 74281 <at> debbugs.gnu.org (full text, mbox):
From: Eli Zaretskii <eliz <at> gnu.org> To: Divya Ranjan <divya <at> subvertising.org>, Stefan Monnier <monnier <at> iro.umontreal.ca> Cc: 74281 <at> debbugs.gnu.org Subject: Re: bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file Date: Thu, 14 Nov 2024 10:44:27 +0200
> Date: Sat, 09 Nov 2024 16:04:13 +0000
> From: Divya Ranjan via "Bug reports for GNU Emacs,
> the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
>
>
> 1. In emacs -Q, open a fairly big Scheme file (> 70k) and try to move in
> the file with C-n, C-f or mouse scrolling. It sverely lags for several
> seconds, doesn’t even respond to C-g.
I can only reproduce this with C-p when moving from the end of the
file. C-n and C-f are instantaneous here, even though this is an
unoptimized build of Emacs 30.
> 2. Toggle font-lock-mode off through M-x, then try to scroll. It works
> as expected, no serious lags.
>
> 3. Running the profiler also shows font-lock as the culprit.
The profile I measured is below. It seems like the bottleneck is
parse-partial-sexp, which means the syntax table
scheme-mode-syntax-table might be the immediate suspect.
> This makes working on big projects, in my case the source code of GNU
> Guix distribution an impossible situation. I haven’t tried setting up
> (Guile) Scheme with Tree-Sitter, but shouldn’t simple
> syntax-highlighting be not a serious problem?
>
> To try a big Scheme file and reproduce this, open tex.scm in
> gnu/packages/tex.scm in Guix source tree:
>
> https://git.savannah.gnu.org/cgit/guix.git
Stefan, what tools do we have to investigate slowness related to
parse-partial-sexp? Or maybe you have suggestions for how to speed up
font-lock in this case?
Here's the profile I get while moving with C-p through the above file:
1151 66% - ...
1151 66% - command-execute
1151 66% - call-interactively
1151 66% - funcall-interactively
1151 66% - previous-line
1151 66% - line-move
798 45% - line-pixel-height
798 45% - jit-lock-function
798 45% - jit-lock-fontify-now
798 45% - jit-lock--run-functions
798 45% - run-hook-wrapped
798 45% - #<byte-code-function CEC>
798 45% - font-lock-fontify-region
798 45% - font-lock-default-fontify-region
798 45% - font-lock-fontify-syntactically-region
798 45% - font-lock-default-fontify-syntactically
798 45% parse-partial-sexp
353 20% - line-move-visual
353 20% - vertical-motion
353 20% - jit-lock-function
353 20% - jit-lock-fontify-now
353 20% - jit-lock--run-functions
353 20% - run-hook-wrapped
353 20% - #<byte-code-function BCE>
353 20% - font-lock-fontify-region
353 20% - font-lock-default-fontify-region
353 20% - font-lock-fontify-syntactically-region
353 20% - font-lock-default-fontify-syntactically
353 20% parse-partial-sexp
585 33% - redisplay_internal (C function)
577 33% - jit-lock-function
577 33% - jit-lock-fontify-now
577 33% - jit-lock--run-functions
577 33% - run-hook-wrapped
577 33% - #<byte-code-function 5A0>
577 33% - font-lock-fontify-region
577 33% - font-lock-default-fontify-region
577 33% - font-lock-fontify-syntactically-region
577 33% - font-lock-default-fontify-syntactically
577 33% parse-partial-sexp
6 0% Automatic GC
bug-gnu-emacs <at> gnu.org:bug#74281; Package emacs.
(Thu, 14 Nov 2024 09:33:01 GMT) Full text and rfc822 format available.Message #11 received at 74281 <at> debbugs.gnu.org (full text, mbox):
From: Divya Ranjan <divya <at> subvertising.org> To: Eli Zaretskii <eliz <at> gnu.org> Cc: Stefan Monnier <monnier <at> iro.umontreal.ca>, 74281 <at> debbugs.gnu.org Subject: Re: bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file Date: Thu, 14 Nov 2024 09:32:12 +0000
Hello, Eli Eli Zaretskii <eliz <at> gnu.org> writes: >> Date: Sat, 09 Nov 2024 16:04:13 +0000 >> From: Divya Ranjan via "Bug reports for GNU Emacs, >> the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org> >> >> >> 1. In emacs -Q, open a fairly big Scheme file (> 70k) and try to move in >> the file with C-n, C-f or mouse scrolling. It sverely lags for several >> seconds, doesn’t even respond to C-g. > > I can only reproduce this with C-p when moving from the end of the > file. C-n and C-f are instantaneous here, even though this is an > unoptimized build of Emacs 30. I see, well its the latest build of emacs on GNU Guix, so yeah. Which lacking features in particular do you think might be causing this? Regards, -- Divya Ranjan, Philosophy, Mathematics, Libre Software.
bug-gnu-emacs <at> gnu.org:bug#74281; Package emacs.
(Thu, 14 Nov 2024 10:07:02 GMT) Full text and rfc822 format available.Message #14 received at 74281 <at> debbugs.gnu.org (full text, mbox):
From: Eli Zaretskii <eliz <at> gnu.org> To: Divya Ranjan <divya <at> subvertising.org> Cc: monnier <at> iro.umontreal.ca, 74281 <at> debbugs.gnu.org Subject: Re: bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file Date: Thu, 14 Nov 2024 12:06:41 +0200
> From: Divya Ranjan <divya <at> subvertising.org> > Cc: Stefan Monnier <monnier <at> iro.umontreal.ca>, 74281 <at> debbugs.gnu.org > Date: Thu, 14 Nov 2024 09:32:12 +0000 > > Hello, Eli > > Eli Zaretskii <eliz <at> gnu.org> writes: > > >> Date: Sat, 09 Nov 2024 16:04:13 +0000 > >> From: Divya Ranjan via "Bug reports for GNU Emacs, > >> the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org> > >> > >> > >> 1. In emacs -Q, open a fairly big Scheme file (> 70k) and try to move in > >> the file with C-n, C-f or mouse scrolling. It sverely lags for several > >> seconds, doesn’t even respond to C-g. > > > > I can only reproduce this with C-p when moving from the end of the > > file. C-n and C-f are instantaneous here, even though this is an > > unoptimized build of Emacs 30. > > I see, well its the latest build of emacs on GNU Guix, so yeah. Which lacking features in particular do you think might be causing this? I don't understand the question: I thought I pointed at the possible cause by mentioning syntax-directed font lock?
bug-gnu-emacs <at> gnu.org:bug#74281; Package emacs.
(Thu, 14 Nov 2024 11:10:02 GMT) Full text and rfc822 format available.Message #17 received at submit <at> debbugs.gnu.org (full text, mbox):
From: Divya Ranjan <divya <at> subvertising.org> To: bug-gnu-emacs <at> gnu.org, Eli Zaretskii <eliz <at> gnu.org> Cc: monnier <at> iro.umontreal.ca, 74281 <at> debbugs.gnu.org Subject: Re: bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file Date: Thu, 14 Nov 2024 11:09:41 +0000
[Message part 1 (text/plain, inline)]
> I don't understand the question: I thought I pointed at the possible cause by mentioning syntax-directed font lock? I meant you said the emacs build is "unoptimized", what can be optimized? Regards, On 14 November 2024 10:06:41 GMT, Eli Zaretskii <eliz <at> gnu.org> wrote: >> From: Divya Ranjan <divya <at> subvertising.org> >> Cc: Stefan Monnier <monnier <at> iro.umontreal.ca>, 74281 <at> debbugs.gnu.org >> Date: Thu, 14 Nov 2024 09:32:12 +0000 >> >> Hello, Eli >> >> Eli Zaretskii <eliz <at> gnu.org> writes: >> >> >> Date: Sat, 09 Nov 2024 16:04:13 +0000 >> >> From: Divya Ranjan via "Bug reports for GNU Emacs, >> >> the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org> >> >> >> >> >> >> 1. In emacs -Q, open a fairly big Scheme file (> 70k) and try to move in >> >> the file with C-n, C-f or mouse scrolling. It sverely lags for several >> >> seconds, doesn’t even respond to C-g. >> > >> > I can only reproduce this with C-p when moving from the end of the >> > file. C-n and C-f are instantaneous here, even though this is an >> > unoptimized build of Emacs 30. >> >> I see, well its the latest build of emacs on GNU Guix, so yeah. Which lacking features in particular do you think might be causing this? > >I don't understand the question: I thought I pointed at the possible >cause by mentioning syntax-directed font lock? > > > Divya Ranjan, Mathematics, Philosophy and Libre Software
[Message part 2 (text/html, inline)]
bug-gnu-emacs <at> gnu.org:bug#74281; Package emacs.
(Thu, 14 Nov 2024 11:10:04 GMT) Full text and rfc822 format available.bug-gnu-emacs <at> gnu.org:bug#74281; Package emacs.
(Thu, 14 Nov 2024 11:43:02 GMT) Full text and rfc822 format available.Message #23 received at 74281 <at> debbugs.gnu.org (full text, mbox):
From: Eli Zaretskii <eliz <at> gnu.org> To: Divya Ranjan <divya <at> subvertising.org> Cc: monnier <at> iro.umontreal.ca, 74281 <at> debbugs.gnu.org Subject: Re: bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file Date: Thu, 14 Nov 2024 13:42:18 +0200
> Date: Thu, 14 Nov 2024 11:09:41 +0000 > From: Divya Ranjan <divya <at> subvertising.org> > CC: monnier <at> iro.umontreal.ca, 74281 <at> debbugs.gnu.org > > > I don't understand the question: I thought I pointed at the possible cause by mentioning syntax-directed > font lock? > > I meant you said the emacs build is "unoptimized", what can be optimized? No, it means the C files were compiled with -O0, which disables compiler optimizations, so my Emacs is supposed to be slower than normal. And yet I seed no lags with C-n, unlike what you report.
bug-gnu-emacs <at> gnu.org:bug#74281; Package emacs.
(Thu, 14 Nov 2024 16:57:02 GMT) Full text and rfc822 format available.Message #26 received at 74281 <at> debbugs.gnu.org (full text, mbox):
From: Stefan Monnier <monnier <at> iro.umontreal.ca> To: Eli Zaretskii <eliz <at> gnu.org> Cc: Divya Ranjan <divya <at> subvertising.org>, 74281 <at> debbugs.gnu.org Subject: Re: bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file Date: Thu, 14 Nov 2024 11:56:37 -0500
> Stefan, what tools do we have to investigate slowness related to
> parse-partial-sexp? Or maybe you have suggestions for how to speed up
> font-lock in this case?
Hmm... `parse-partial-sexp` is normally expected to be fast, unless it
has to scan a lot of text.
> Here's the profile I get while moving with C-p through the above file:
A stab in the dark, but maybe the relevant call is the one in:
(state (if (or syntax-ppss-table
(not font-lock--syntax-table-affects-ppss))
(syntax-ppss start)
;; If `syntax-ppss' doesn't have its own syntax-table and
;; we have installed our own syntax-table which
;; differs from the standard one in ways which affects PPSS,
;; then we can't use `syntax-ppss' since that would pollute
;; and be polluted by its cache.
(parse-partial-sexp (point-min) start)))
so the origin of the slowdown would be the (?#. "w 14") in the setting
below in `scheme.el`:
(setq font-lock-defaults
'((scheme-font-lock-keywords
scheme-font-lock-keywords-1 scheme-font-lock-keywords-2)
nil t (("+-*/.<>=!?$%_&~^:" . "w") (?#. "w 14"))
beginning-of-defun
(font-lock-mark-block-function . mark-defun)))
in which case, setting a `syntax-ppss-table` should fix the problem, tho
we could also fix it by being more careful: AFAICT the purpose of this
(?#. "w 14") is only to change the syntax of `#` from "prefix" to "word"
without changing the comment-related flags, so it shouldn't cause
`font-lock--syntax-table-affects-ppss` to be set.
So, we could solve it by improving the code that sets
`font-lock--syntax-table-affects-ppss`, as in the patch below.
Stefan
diff --git a/lisp/font-lock.el b/lisp/font-lock.el
index 203131bfd5a..f6299920c0a 100644
--- a/lisp/font-lock.el
+++ b/lisp/font-lock.el
@@ -1955,14 +1955,15 @@ font-lock-set-defaults
(dolist (char (if (numberp (car selem))
(list (car selem))
(mapcar #'identity (car selem))))
- (unless (memq (car (aref font-lock-syntax-table char))
- '(1 2 3)) ;"." "w" "_"
- (setq font-lock--syntax-table-affects-ppss t))
- (modify-syntax-entry char syntax font-lock-syntax-table)
- (unless (memq (car (aref font-lock-syntax-table char))
- '(1 2 3)) ;"." "w" "_"
- (setq font-lock--syntax-table-affects-ppss t))
- ))))
+ (let ((old-syntax (aref font-lock-syntax-table char)))
+ (modify-syntax-entry char syntax font-lock-syntax-table)
+ (let ((new-syntax (aref font-lock-syntax-table char)))
+ (unless (and (equal (cdr old-syntax) (cdr new-syntax))
+ (memq (logand (car old-syntax) 255) '(1 2 3 6))
+ (memq (logand (car new-syntax) 255) '(1 2 3 6))
+ (equal (ash (car old-syntax) -8)
+ (ash (car new-syntax) -8)))
+ (setq font-lock--syntax-table-affects-ppss t))))))))
;; (nth 4 defaults) used to hold `font-lock-beginning-of-syntax-function',
;; but that was removed in 25.1, so if it's a cons cell, we assume that
;; it's part of the variable alist.
bug-gnu-emacs <at> gnu.org:bug#74281; Package emacs.
(Sat, 30 Nov 2024 09:52:02 GMT) Full text and rfc822 format available.Message #29 received at 74281 <at> debbugs.gnu.org (full text, mbox):
From: Eli Zaretskii <eliz <at> gnu.org> To: divya <at> subvertising.org, Stefan Monnier <monnier <at> iro.umontreal.ca> Cc: 74281 <at> debbugs.gnu.org Subject: Re: bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file Date: Sat, 30 Nov 2024 11:51:49 +0200
Ping! Divya, could you please try Stefan's suggestions and report
back?
> Cc: Divya Ranjan <divya <at> subvertising.org>, 74281 <at> debbugs.gnu.org
> From: Stefan Monnier <monnier <at> iro.umontreal.ca>
> Date: Thu, 14 Nov 2024 11:56:37 -0500
>
> > Stefan, what tools do we have to investigate slowness related to
> > parse-partial-sexp? Or maybe you have suggestions for how to speed up
> > font-lock in this case?
>
> Hmm... `parse-partial-sexp` is normally expected to be fast, unless it
> has to scan a lot of text.
>
> > Here's the profile I get while moving with C-p through the above file:
>
> A stab in the dark, but maybe the relevant call is the one in:
>
> (state (if (or syntax-ppss-table
> (not font-lock--syntax-table-affects-ppss))
> (syntax-ppss start)
> ;; If `syntax-ppss' doesn't have its own syntax-table and
> ;; we have installed our own syntax-table which
> ;; differs from the standard one in ways which affects PPSS,
> ;; then we can't use `syntax-ppss' since that would pollute
> ;; and be polluted by its cache.
> (parse-partial-sexp (point-min) start)))
>
> so the origin of the slowdown would be the (?#. "w 14") in the setting
> below in `scheme.el`:
>
> (setq font-lock-defaults
> '((scheme-font-lock-keywords
> scheme-font-lock-keywords-1 scheme-font-lock-keywords-2)
> nil t (("+-*/.<>=!?$%_&~^:" . "w") (?#. "w 14"))
> beginning-of-defun
> (font-lock-mark-block-function . mark-defun)))
>
> in which case, setting a `syntax-ppss-table` should fix the problem, tho
> we could also fix it by being more careful: AFAICT the purpose of this
> (?#. "w 14") is only to change the syntax of `#` from "prefix" to "word"
> without changing the comment-related flags, so it shouldn't cause
> `font-lock--syntax-table-affects-ppss` to be set.
> So, we could solve it by improving the code that sets
> `font-lock--syntax-table-affects-ppss`, as in the patch below.
>
>
> Stefan
>
>
> diff --git a/lisp/font-lock.el b/lisp/font-lock.el
> index 203131bfd5a..f6299920c0a 100644
> --- a/lisp/font-lock.el
> +++ b/lisp/font-lock.el
> @@ -1955,14 +1955,15 @@ font-lock-set-defaults
> (dolist (char (if (numberp (car selem))
> (list (car selem))
> (mapcar #'identity (car selem))))
> - (unless (memq (car (aref font-lock-syntax-table char))
> - '(1 2 3)) ;"." "w" "_"
> - (setq font-lock--syntax-table-affects-ppss t))
> - (modify-syntax-entry char syntax font-lock-syntax-table)
> - (unless (memq (car (aref font-lock-syntax-table char))
> - '(1 2 3)) ;"." "w" "_"
> - (setq font-lock--syntax-table-affects-ppss t))
> - ))))
> + (let ((old-syntax (aref font-lock-syntax-table char)))
> + (modify-syntax-entry char syntax font-lock-syntax-table)
> + (let ((new-syntax (aref font-lock-syntax-table char)))
> + (unless (and (equal (cdr old-syntax) (cdr new-syntax))
> + (memq (logand (car old-syntax) 255) '(1 2 3 6))
> + (memq (logand (car new-syntax) 255) '(1 2 3 6))
> + (equal (ash (car old-syntax) -8)
> + (ash (car new-syntax) -8)))
> + (setq font-lock--syntax-table-affects-ppss t))))))))
> ;; (nth 4 defaults) used to hold `font-lock-beginning-of-syntax-function',
> ;; but that was removed in 25.1, so if it's a cons cell, we assume that
> ;; it's part of the variable alist.
>
>
>
>
>
bug-gnu-emacs <at> gnu.org:bug#74281; Package emacs.
(Sat, 14 Dec 2024 09:35:02 GMT) Full text and rfc822 format available.Message #32 received at 74281 <at> debbugs.gnu.org (full text, mbox):
From: Eli Zaretskii <eliz <at> gnu.org> To: divya <at> subvertising.org Cc: monnier <at> iro.umontreal.ca, 74281 <at> debbugs.gnu.org Subject: Re: bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file Date: Sat, 14 Dec 2024 11:34:40 +0200
Ping! Ping! Divya, are you there?
> Cc: 74281 <at> debbugs.gnu.org
> Date: Sat, 30 Nov 2024 11:51:49 +0200
> From: Eli Zaretskii <eliz <at> gnu.org>
>
> Ping! Divya, could you please try Stefan's suggestions and report
> back?
>
> > Cc: Divya Ranjan <divya <at> subvertising.org>, 74281 <at> debbugs.gnu.org
> > From: Stefan Monnier <monnier <at> iro.umontreal.ca>
> > Date: Thu, 14 Nov 2024 11:56:37 -0500
> >
> > > Stefan, what tools do we have to investigate slowness related to
> > > parse-partial-sexp? Or maybe you have suggestions for how to speed up
> > > font-lock in this case?
> >
> > Hmm... `parse-partial-sexp` is normally expected to be fast, unless it
> > has to scan a lot of text.
> >
> > > Here's the profile I get while moving with C-p through the above file:
> >
> > A stab in the dark, but maybe the relevant call is the one in:
> >
> > (state (if (or syntax-ppss-table
> > (not font-lock--syntax-table-affects-ppss))
> > (syntax-ppss start)
> > ;; If `syntax-ppss' doesn't have its own syntax-table and
> > ;; we have installed our own syntax-table which
> > ;; differs from the standard one in ways which affects PPSS,
> > ;; then we can't use `syntax-ppss' since that would pollute
> > ;; and be polluted by its cache.
> > (parse-partial-sexp (point-min) start)))
> >
> > so the origin of the slowdown would be the (?#. "w 14") in the setting
> > below in `scheme.el`:
> >
> > (setq font-lock-defaults
> > '((scheme-font-lock-keywords
> > scheme-font-lock-keywords-1 scheme-font-lock-keywords-2)
> > nil t (("+-*/.<>=!?$%_&~^:" . "w") (?#. "w 14"))
> > beginning-of-defun
> > (font-lock-mark-block-function . mark-defun)))
> >
> > in which case, setting a `syntax-ppss-table` should fix the problem, tho
> > we could also fix it by being more careful: AFAICT the purpose of this
> > (?#. "w 14") is only to change the syntax of `#` from "prefix" to "word"
> > without changing the comment-related flags, so it shouldn't cause
> > `font-lock--syntax-table-affects-ppss` to be set.
> > So, we could solve it by improving the code that sets
> > `font-lock--syntax-table-affects-ppss`, as in the patch below.
> >
> >
> > Stefan
> >
> >
> > diff --git a/lisp/font-lock.el b/lisp/font-lock.el
> > index 203131bfd5a..f6299920c0a 100644
> > --- a/lisp/font-lock.el
> > +++ b/lisp/font-lock.el
> > @@ -1955,14 +1955,15 @@ font-lock-set-defaults
> > (dolist (char (if (numberp (car selem))
> > (list (car selem))
> > (mapcar #'identity (car selem))))
> > - (unless (memq (car (aref font-lock-syntax-table char))
> > - '(1 2 3)) ;"." "w" "_"
> > - (setq font-lock--syntax-table-affects-ppss t))
> > - (modify-syntax-entry char syntax font-lock-syntax-table)
> > - (unless (memq (car (aref font-lock-syntax-table char))
> > - '(1 2 3)) ;"." "w" "_"
> > - (setq font-lock--syntax-table-affects-ppss t))
> > - ))))
> > + (let ((old-syntax (aref font-lock-syntax-table char)))
> > + (modify-syntax-entry char syntax font-lock-syntax-table)
> > + (let ((new-syntax (aref font-lock-syntax-table char)))
> > + (unless (and (equal (cdr old-syntax) (cdr new-syntax))
> > + (memq (logand (car old-syntax) 255) '(1 2 3 6))
> > + (memq (logand (car new-syntax) 255) '(1 2 3 6))
> > + (equal (ash (car old-syntax) -8)
> > + (ash (car new-syntax) -8)))
> > + (setq font-lock--syntax-table-affects-ppss t))))))))
> > ;; (nth 4 defaults) used to hold `font-lock-beginning-of-syntax-function',
> > ;; but that was removed in 25.1, so if it's a cons cell, we assume that
> > ;; it's part of the variable alist.
> >
> >
> >
> >
> >
>
>
>
>
bug-gnu-emacs <at> gnu.org:bug#74281; Package emacs.
(Sat, 28 Dec 2024 11:10:03 GMT) Full text and rfc822 format available.Message #35 received at 74281 <at> debbugs.gnu.org (full text, mbox):
From: Eli Zaretskii <eliz <at> gnu.org> To: divya <at> subvertising.org Cc: monnier <at> iro.umontreal.ca, 74281 <at> debbugs.gnu.org Subject: Re: bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file Date: Sat, 28 Dec 2024 13:09:46 +0200
Ping! Ping! Ping! Divya, please respond.
> Cc: monnier <at> iro.umontreal.ca, 74281 <at> debbugs.gnu.org
> Date: Sat, 14 Dec 2024 11:34:40 +0200
> From: Eli Zaretskii <eliz <at> gnu.org>
>
> Ping! Ping! Divya, are you there?
>
> > Cc: 74281 <at> debbugs.gnu.org
> > Date: Sat, 30 Nov 2024 11:51:49 +0200
> > From: Eli Zaretskii <eliz <at> gnu.org>
> >
> > Ping! Divya, could you please try Stefan's suggestions and report
> > back?
> >
> > > Cc: Divya Ranjan <divya <at> subvertising.org>, 74281 <at> debbugs.gnu.org
> > > From: Stefan Monnier <monnier <at> iro.umontreal.ca>
> > > Date: Thu, 14 Nov 2024 11:56:37 -0500
> > >
> > > > Stefan, what tools do we have to investigate slowness related to
> > > > parse-partial-sexp? Or maybe you have suggestions for how to speed up
> > > > font-lock in this case?
> > >
> > > Hmm... `parse-partial-sexp` is normally expected to be fast, unless it
> > > has to scan a lot of text.
> > >
> > > > Here's the profile I get while moving with C-p through the above file:
> > >
> > > A stab in the dark, but maybe the relevant call is the one in:
> > >
> > > (state (if (or syntax-ppss-table
> > > (not font-lock--syntax-table-affects-ppss))
> > > (syntax-ppss start)
> > > ;; If `syntax-ppss' doesn't have its own syntax-table and
> > > ;; we have installed our own syntax-table which
> > > ;; differs from the standard one in ways which affects PPSS,
> > > ;; then we can't use `syntax-ppss' since that would pollute
> > > ;; and be polluted by its cache.
> > > (parse-partial-sexp (point-min) start)))
> > >
> > > so the origin of the slowdown would be the (?#. "w 14") in the setting
> > > below in `scheme.el`:
> > >
> > > (setq font-lock-defaults
> > > '((scheme-font-lock-keywords
> > > scheme-font-lock-keywords-1 scheme-font-lock-keywords-2)
> > > nil t (("+-*/.<>=!?$%_&~^:" . "w") (?#. "w 14"))
> > > beginning-of-defun
> > > (font-lock-mark-block-function . mark-defun)))
> > >
> > > in which case, setting a `syntax-ppss-table` should fix the problem, tho
> > > we could also fix it by being more careful: AFAICT the purpose of this
> > > (?#. "w 14") is only to change the syntax of `#` from "prefix" to "word"
> > > without changing the comment-related flags, so it shouldn't cause
> > > `font-lock--syntax-table-affects-ppss` to be set.
> > > So, we could solve it by improving the code that sets
> > > `font-lock--syntax-table-affects-ppss`, as in the patch below.
> > >
> > >
> > > Stefan
> > >
> > >
> > > diff --git a/lisp/font-lock.el b/lisp/font-lock.el
> > > index 203131bfd5a..f6299920c0a 100644
> > > --- a/lisp/font-lock.el
> > > +++ b/lisp/font-lock.el
> > > @@ -1955,14 +1955,15 @@ font-lock-set-defaults
> > > (dolist (char (if (numberp (car selem))
> > > (list (car selem))
> > > (mapcar #'identity (car selem))))
> > > - (unless (memq (car (aref font-lock-syntax-table char))
> > > - '(1 2 3)) ;"." "w" "_"
> > > - (setq font-lock--syntax-table-affects-ppss t))
> > > - (modify-syntax-entry char syntax font-lock-syntax-table)
> > > - (unless (memq (car (aref font-lock-syntax-table char))
> > > - '(1 2 3)) ;"." "w" "_"
> > > - (setq font-lock--syntax-table-affects-ppss t))
> > > - ))))
> > > + (let ((old-syntax (aref font-lock-syntax-table char)))
> > > + (modify-syntax-entry char syntax font-lock-syntax-table)
> > > + (let ((new-syntax (aref font-lock-syntax-table char)))
> > > + (unless (and (equal (cdr old-syntax) (cdr new-syntax))
> > > + (memq (logand (car old-syntax) 255) '(1 2 3 6))
> > > + (memq (logand (car new-syntax) 255) '(1 2 3 6))
> > > + (equal (ash (car old-syntax) -8)
> > > + (ash (car new-syntax) -8)))
> > > + (setq font-lock--syntax-table-affects-ppss t))))))))
> > > ;; (nth 4 defaults) used to hold `font-lock-beginning-of-syntax-function',
> > > ;; but that was removed in 25.1, so if it's a cons cell, we assume that
> > > ;; it's part of the variable alist.
> > >
> > >
> > >
> > >
> > >
> >
> >
> >
> >
>
>
>
>
bug-gnu-emacs <at> gnu.org:bug#74281; Package emacs.
(Sat, 28 Dec 2024 15:04:01 GMT) Full text and rfc822 format available.Message #38 received at 74281 <at> debbugs.gnu.org (full text, mbox):
From: Stefan Monnier <monnier <at> iro.umontreal.ca> To: Eli Zaretskii <eliz <at> gnu.org> Cc: divya <at> subvertising.org, 74281 <at> debbugs.gnu.org Subject: Re: bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file Date: Sat, 28 Dec 2024 10:03:29 -0500
> Ping! Divya, could you please try Stefan's suggestions and report
> back?
FWIW, I think the change is an improvement in any case, so we could
install it. Since it's in a "core" file, it might be too risky for
`emacs-30`, so I'm thinking of installing it in `master`, WDYT?
Stefan
>> Cc: Divya Ranjan <divya <at> subvertising.org>, 74281 <at> debbugs.gnu.org
>> From: Stefan Monnier <monnier <at> iro.umontreal.ca>
>> Date: Thu, 14 Nov 2024 11:56:37 -0500
>>
>> > Stefan, what tools do we have to investigate slowness related to
>> > parse-partial-sexp? Or maybe you have suggestions for how to speed up
>> > font-lock in this case?
>>
>> Hmm... `parse-partial-sexp` is normally expected to be fast, unless it
>> has to scan a lot of text.
>>
>> > Here's the profile I get while moving with C-p through the above file:
>>
>> A stab in the dark, but maybe the relevant call is the one in:
>>
>> (state (if (or syntax-ppss-table
>> (not font-lock--syntax-table-affects-ppss))
>> (syntax-ppss start)
>> ;; If `syntax-ppss' doesn't have its own syntax-table and
>> ;; we have installed our own syntax-table which
>> ;; differs from the standard one in ways which affects PPSS,
>> ;; then we can't use `syntax-ppss' since that would pollute
>> ;; and be polluted by its cache.
>> (parse-partial-sexp (point-min) start)))
>>
>> so the origin of the slowdown would be the (?#. "w 14") in the setting
>> below in `scheme.el`:
>>
>> (setq font-lock-defaults
>> '((scheme-font-lock-keywords
>> scheme-font-lock-keywords-1 scheme-font-lock-keywords-2)
>> nil t (("+-*/.<>=!?$%_&~^:" . "w") (?#. "w 14"))
>> beginning-of-defun
>> (font-lock-mark-block-function . mark-defun)))
>>
>> in which case, setting a `syntax-ppss-table` should fix the problem, tho
>> we could also fix it by being more careful: AFAICT the purpose of this
>> (?#. "w 14") is only to change the syntax of `#` from "prefix" to "word"
>> without changing the comment-related flags, so it shouldn't cause
>> `font-lock--syntax-table-affects-ppss` to be set.
>> So, we could solve it by improving the code that sets
>> `font-lock--syntax-table-affects-ppss`, as in the patch below.
>>
>>
>> Stefan
>>
>>
>> diff --git a/lisp/font-lock.el b/lisp/font-lock.el
>> index 203131bfd5a..f6299920c0a 100644
>> --- a/lisp/font-lock.el
>> +++ b/lisp/font-lock.el
>> @@ -1955,14 +1955,15 @@ font-lock-set-defaults
>> (dolist (char (if (numberp (car selem))
>> (list (car selem))
>> (mapcar #'identity (car selem))))
>> - (unless (memq (car (aref font-lock-syntax-table char))
>> - '(1 2 3)) ;"." "w" "_"
>> - (setq font-lock--syntax-table-affects-ppss t))
>> - (modify-syntax-entry char syntax font-lock-syntax-table)
>> - (unless (memq (car (aref font-lock-syntax-table char))
>> - '(1 2 3)) ;"." "w" "_"
>> - (setq font-lock--syntax-table-affects-ppss t))
>> - ))))
>> + (let ((old-syntax (aref font-lock-syntax-table char)))
>> + (modify-syntax-entry char syntax font-lock-syntax-table)
>> + (let ((new-syntax (aref font-lock-syntax-table char)))
>> + (unless (and (equal (cdr old-syntax) (cdr new-syntax))
>> + (memq (logand (car old-syntax) 255) '(1 2 3 6))
>> + (memq (logand (car new-syntax) 255) '(1 2 3 6))
>> + (equal (ash (car old-syntax) -8)
>> + (ash (car new-syntax) -8)))
>> + (setq font-lock--syntax-table-affects-ppss t))))))))
>> ;; (nth 4 defaults) used to hold `font-lock-beginning-of-syntax-function',
>> ;; but that was removed in 25.1, so if it's a cons cell, we assume that
>> ;; it's part of the variable alist.
>>
>>
>>
>>
>>
bug-gnu-emacs <at> gnu.org:bug#74281; Package emacs.
(Sat, 28 Dec 2024 16:37:02 GMT) Full text and rfc822 format available.Message #41 received at 74281 <at> debbugs.gnu.org (full text, mbox):
From: Eli Zaretskii <eliz <at> gnu.org> To: Stefan Monnier <monnier <at> iro.umontreal.ca> Cc: divya <at> subvertising.org, 74281 <at> debbugs.gnu.org Subject: Re: bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file Date: Sat, 28 Dec 2024 18:33:49 +0200
> From: Stefan Monnier <monnier <at> iro.umontreal.ca> > Cc: divya <at> subvertising.org, 74281 <at> debbugs.gnu.org > Date: Sat, 28 Dec 2024 10:03:29 -0500 > > > Ping! Divya, could you please try Stefan's suggestions and report > > back? > > FWIW, I think the change is an improvement in any case, so we could > install it. Since it's in a "core" file, it might be too risky for > `emacs-30`, so I'm thinking of installing it in `master`, WDYT? Fine by me, thanks.
bug-gnu-emacs <at> gnu.org:bug#74281; Package emacs.
(Sun, 29 Dec 2024 15:21:02 GMT) Full text and rfc822 format available.Message #44 received at 74281 <at> debbugs.gnu.org (full text, mbox):
From: Stefan Monnier <monnier <at> iro.umontreal.ca> To: Eli Zaretskii <eliz <at> gnu.org> Cc: divya <at> subvertising.org, 74281 <at> debbugs.gnu.org Subject: Re: bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file Date: Sun, 29 Dec 2024 10:20:19 -0500
>> > Ping! Divya, could you please try Stefan's suggestions and report
>> > back?
>> FWIW, I think the change is an improvement in any case, so we could
>> install it. Since it's in a "core" file, it might be too risky for
>> `emacs-30`, so I'm thinking of installing it in `master`, WDYT?
> Fine by me, thanks.
Pushed to `master`, thanks.
Stefan
bug-gnu-emacs <at> gnu.org:bug#74281; Package emacs.
(Sun, 29 Dec 2024 18:02:01 GMT) Full text and rfc822 format available.Message #47 received at 74281 <at> debbugs.gnu.org (full text, mbox):
From: Stefan Monnier <monnier <at> iro.umontreal.ca> To: Eli Zaretskii <eliz <at> gnu.org> Cc: divya <at> subvertising.org, 74281 <at> debbugs.gnu.org Subject: Re: bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file Date: Sun, 29 Dec 2024 13:01:14 -0500
>>> > Ping! Divya, could you please try Stefan's suggestions and report
>>> > back?
>>> FWIW, I think the change is an improvement in any case, so we could
>>> install it. Since it's in a "core" file, it might be too risky for
>>> `emacs-30`, so I'm thinking of installing it in `master`, WDYT?
>> Fine by me, thanks.
> Pushed to `master`, thanks.
BTW, if we want something on `emacs-30`, we could go with a patch like
the one below.
Stefan
diff --git a/lisp/progmodes/scheme.el b/lisp/progmodes/scheme.el
index a0f922f279c..c46422b7218 100644
--- a/lisp/progmodes/scheme.el
+++ b/lisp/progmodes/scheme.el
@@ -201,7 +201,10 @@ scheme-mode-variables
scheme-font-lock-keywords-1 scheme-font-lock-keywords-2)
nil t (("+-*/.<>=!?$%_&~^:" . "w") (?#. "w 14"))
beginning-of-defun
- (font-lock-mark-block-function . mark-defun)))
+ (font-lock-mark-block-function . mark-defun)
+ ;; The (?#. "w 14") above causes font-lock to incorrectly
+ ;; set `font-lock--syntax-table-affects-ppss' to t.
+ (font-lock--syntax-table-affects-ppss . nil)))
(setq-local prettify-symbols-alist lisp-prettify-symbols-alist)
(setq-local lisp-doc-string-elt-property 'scheme-doc-string-elt))
bug-gnu-emacs <at> gnu.org:bug#74281; Package emacs.
(Sun, 29 Dec 2024 18:39:02 GMT) Full text and rfc822 format available.Message #50 received at submit <at> debbugs.gnu.org (full text, mbox):
From: Divya Ranjan <divya <at> subvertising.org> To: bug-gnu-emacs <at> gnu.org, Eli Zaretskii <eliz <at> gnu.org> Cc: monnier <at> iro.umontreal.ca, 74281 <at> debbugs.gnu.org Subject: Re: bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file Date: Sun, 29 Dec 2024 18:38:17 +0000
[Message part 1 (text/plain, inline)]
Apologies Eli, I missed this thread!
On 28 December 2024 11:09:46 GMT, Eli Zaretskii <eliz <at> gnu.org> wrote:
>Ping! Ping! Ping! Divya, please respond.
>
>> Cc: monnier <at> iro.umontreal.ca, 74281 <at> debbugs.gnu.org
>> Date: Sat, 14 Dec 2024 11:34:40 +0200
>> From: Eli Zaretskii <eliz <at> gnu.org>
>>
>> Ping! Ping! Divya, are you there?
>>
>> > Cc: 74281 <at> debbugs.gnu.org
>> > Date: Sat, 30 Nov 2024 11:51:49 +0200
>> > From: Eli Zaretskii <eliz <at> gnu.org>
>> >
>> > Ping! Divya, could you please try Stefan's suggestions and report
>> > back?
>> >
>> > > Cc: Divya Ranjan <divya <at> subvertising.org>, 74281 <at> debbugs.gnu.org
>> > > From: Stefan Monnier <monnier <at> iro.umontreal.ca>
>> > > Date: Thu, 14 Nov 2024 11:56:37 -0500
>> > >
>> > > > Stefan, what tools do we have to investigate slowness related to
>> > > > parse-partial-sexp? Or maybe you have suggestions for how to speed up
>> > > > font-lock in this case?
>> > >
>> > > Hmm... `parse-partial-sexp` is normally expected to be fast, unless it
>> > > has to scan a lot of text.
>> > >
>> > > > Here's the profile I get while moving with C-p through the above file:
>> > >
>> > > A stab in the dark, but maybe the relevant call is the one in:
>> > >
>> > > (state (if (or syntax-ppss-table
>> > > (not font-lock--syntax-table-affects-ppss))
>> > > (syntax-ppss start)
>> > > ;; If `syntax-ppss' doesn't have its own syntax-table and
>> > > ;; we have installed our own syntax-table which
>> > > ;; differs from the standard one in ways which affects PPSS,
>> > > ;; then we can't use `syntax-ppss' since that would pollute
>> > > ;; and be polluted by its cache.
>> > > (parse-partial-sexp (point-min) start)))
>> > >
>> > > so the origin of the slowdown would be the (?#. "w 14") in the setting
>> > > below in `scheme.el`:
>> > >
>> > > (setq font-lock-defaults
>> > > '((scheme-font-lock-keywords
>> > > scheme-font-lock-keywords-1 scheme-font-lock-keywords-2)
>> > > nil t (("+-*/.<>=!?$%_&~^:" . "w") (?#. "w 14"))
>> > > beginning-of-defun
>> > > (font-lock-mark-block-function . mark-defun)))
>> > >
>> > > in which case, setting a `syntax-ppss-table` should fix the problem, tho
>> > > we could also fix it by being more careful: AFAICT the purpose of this
>> > > (?#. "w 14") is only to change the syntax of `#` from "prefix" to "word"
>> > > without changing the comment-related flags, so it shouldn't cause
>> > > `font-lock--syntax-table-affects-ppss` to be set.
>> > > So, we could solve it by improving the code that sets
>> > > `font-lock--syntax-table-affects-ppss`, as in the patch below.
>> > >
>> > >
>> > > Stefan
>> > >
>> > >
>> > > diff --git a/lisp/font-lock.el b/lisp/font-lock.el
>> > > index 203131bfd5a..f6299920c0a 100644
>> > > --- a/lisp/font-lock.el
>> > > +++ b/lisp/font-lock.el
>> > > @@ -1955,14 +1955,15 @@ font-lock-set-defaults
>> > > (dolist (char (if (numberp (car selem))
>> > > (list (car selem))
>> > > (mapcar #'identity (car selem))))
>> > > - (unless (memq (car (aref font-lock-syntax-table char))
>> > > - '(1 2 3)) ;"." "w" "_"
>> > > - (setq font-lock--syntax-table-affects-ppss t))
>> > > - (modify-syntax-entry char syntax font-lock-syntax-table)
>> > > - (unless (memq (car (aref font-lock-syntax-table char))
>> > > - '(1 2 3)) ;"." "w" "_"
>> > > - (setq font-lock--syntax-table-affects-ppss t))
>> > > - ))))
>> > > + (let ((old-syntax (aref font-lock-syntax-table char)))
>> > > + (modify-syntax-entry char syntax font-lock-syntax-table)
>> > > + (let ((new-syntax (aref font-lock-syntax-table char)))
>> > > + (unless (and (equal (cdr old-syntax) (cdr new-syntax))
>> > > + (memq (logand (car old-syntax) 255) '(1 2 3 6))
>> > > + (memq (logand (car new-syntax) 255) '(1 2 3 6))
>> > > + (equal (ash (car old-syntax) -8)
>> > > + (ash (car new-syntax) -8)))
>> > > + (setq font-lock--syntax-table-affects-ppss t))))))))
>> > > ;; (nth 4 defaults) used to hold `font-lock-beginning-of-syntax-function',
>> > > ;; but that was removed in 25.1, so if it's a cons cell, we assume that
>> > > ;; it's part of the variable alist.
>> > >
>> > >
>> > >
>> > >
>> > >
>> >
>> >
>> >
>> >
>>
>>
>>
>>
>
>
>
Divya Ranjan, Mathematics, Philosophy and Libre Software
[Message part 2 (text/html, inline)]
bug-gnu-emacs <at> gnu.org:bug#74281; Package emacs.
(Sun, 29 Dec 2024 18:39:03 GMT) Full text and rfc822 format available.bug-gnu-emacs <at> gnu.org:bug#74281; Package emacs.
(Sun, 29 Dec 2024 18:44:02 GMT) Full text and rfc822 format available.Message #56 received at 74281 <at> debbugs.gnu.org (full text, mbox):
From: Divya Ranjan <divya <at> subvertising.org> To: Stefan Monnier <monnier <at> iro.umontreal.ca>, Eli Zaretskii <eliz <at> gnu.org> Cc: 74281 <at> debbugs.gnu.org Subject: Re: bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file Date: Sun, 29 Dec 2024 18:43:01 +0000
[Message part 1 (text/plain, inline)]
I recently did a build of `master`, I don't think the bug was fixed. Have you tested with `tex.el`? On 29 December 2024 15:20:19 GMT, Stefan Monnier <monnier <at> iro.umontreal.ca> wrote: >>> > Ping! Divya, could you please try Stefan's suggestions and report >>> > back? >>> FWIW, I think the change is an improvement in any case, so we could >>> install it. Since it's in a "core" file, it might be too risky for >>> `emacs-30`, so I'm thinking of installing it in `master`, WDYT? >> Fine by me, thanks. > >Pushed to `master`, thanks. > > > Stefan > Divya Ranjan, Mathematics, Philosophy and Libre Software
[Message part 2 (text/html, inline)]
bug-gnu-emacs <at> gnu.org:bug#74281; Package emacs.
(Sun, 29 Dec 2024 18:59:02 GMT) Full text and rfc822 format available.Message #59 received at 74281 <at> debbugs.gnu.org (full text, mbox):
From: Eli Zaretskii <eliz <at> gnu.org> To: Stefan Monnier <monnier <at> iro.umontreal.ca> Cc: divya <at> subvertising.org, 74281 <at> debbugs.gnu.org Subject: Re: bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file Date: Sun, 29 Dec 2024 20:58:31 +0200
> From: Stefan Monnier <monnier <at> iro.umontreal.ca>
> Cc: divya <at> subvertising.org, 74281 <at> debbugs.gnu.org
> Date: Sun, 29 Dec 2024 13:01:14 -0500
>
> BTW, if we want something on `emacs-30`, we could go with a patch like
> the one below.
>
>
> Stefan
>
>
> diff --git a/lisp/progmodes/scheme.el b/lisp/progmodes/scheme.el
> index a0f922f279c..c46422b7218 100644
> --- a/lisp/progmodes/scheme.el
> +++ b/lisp/progmodes/scheme.el
> @@ -201,7 +201,10 @@ scheme-mode-variables
> scheme-font-lock-keywords-1 scheme-font-lock-keywords-2)
> nil t (("+-*/.<>=!?$%_&~^:" . "w") (?#. "w 14"))
> beginning-of-defun
> - (font-lock-mark-block-function . mark-defun)))
> + (font-lock-mark-block-function . mark-defun)
> + ;; The (?#. "w 14") above causes font-lock to incorrectly
> + ;; set `font-lock--syntax-table-affects-ppss' to t.
> + (font-lock--syntax-table-affects-ppss . nil)))
> (setq-local prettify-symbols-alist lisp-prettify-symbols-alist)
> (setq-local lisp-doc-string-elt-property 'scheme-doc-string-elt))
What does it do, and what potential harm could happen if we install
this?
bug-gnu-emacs <at> gnu.org:bug#74281; Package emacs.
(Sun, 29 Dec 2024 20:03:02 GMT) Full text and rfc822 format available.Message #62 received at 74281 <at> debbugs.gnu.org (full text, mbox):
From: Stefan Monnier <monnier <at> iro.umontreal.ca> To: Eli Zaretskii <eliz <at> gnu.org> Cc: divya <at> subvertising.org, 74281 <at> debbugs.gnu.org Subject: Re: bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file Date: Sun, 29 Dec 2024 15:01:49 -0500
>> diff --git a/lisp/progmodes/scheme.el b/lisp/progmodes/scheme.el
>> index a0f922f279c..c46422b7218 100644
>> --- a/lisp/progmodes/scheme.el
>> +++ b/lisp/progmodes/scheme.el
>> @@ -201,7 +201,10 @@ scheme-mode-variables
>> scheme-font-lock-keywords-1 scheme-font-lock-keywords-2)
>> nil t (("+-*/.<>=!?$%_&~^:" . "w") (?#. "w 14"))
>> beginning-of-defun
>> - (font-lock-mark-block-function . mark-defun)))
>> + (font-lock-mark-block-function . mark-defun)
>> + ;; The (?#. "w 14") above causes font-lock to incorrectly
>> + ;; set `font-lock--syntax-table-affects-ppss' to t.
>> + (font-lock--syntax-table-affects-ppss . nil)))
>> (setq-local prettify-symbols-alist lisp-prettify-symbols-alist)
>> (setq-local lisp-doc-string-elt-property 'scheme-doc-string-elt))
>
> What does it do,
This variable controls whether font-lock uses `syntax-ppss` or not.
By setting to nil, it lets font-lock use `syntax-ppss` which means that
on large buffers it tends to be much faster because it doesn't need to
`parse-partial-sexp` all the way from `point-min` every time.
> and what potential harm could happen if we install this?
If it's set incorrectly, it can lead to messed up `syntax-ppss` state
(because some calls use one syntax table and others use another) which
could lead to mis-indentation, mis-fontification, incorrect highlighting
of matched paren, incorrect buffer navigation, etc...
Of course, these risks are confined to those buffers that use
`scheme-mode` or a mode that derives from it.
I believe the setting is correct for `scheme-mode`, but it's possible
that some derived mode changes the `font-lock-syntax-table` and relies
(incorrectly) on `scheme-mode` having already set
`font-lock--syntax-table-affects-ppss` to t.
This said, AFAICT this performance problem has been with us since
Emacs-28 (commit cdadb7a97cbe), so it's not super urgent to fix it.
I think we're fine with the fix on `master`. It would be nice
to get confirmation from Divya that it does fix the problem he sees.
Stefan
bug-gnu-emacs <at> gnu.org:bug#74281; Package emacs.
(Mon, 30 Dec 2024 04:46:02 GMT) Full text and rfc822 format available.Message #65 received at 74281 <at> debbugs.gnu.org (full text, mbox):
From: Stefan Monnier <monnier <at> iro.umontreal.ca> To: Divya Ranjan <divya <at> subvertising.org> Cc: Eli Zaretskii <eliz <at> gnu.org>, 74281 <at> debbugs.gnu.org Subject: Re: bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file Date: Sun, 29 Dec 2024 23:45:19 -0500
> I recently did a build of `master`, I don't think the bug was fixed.
> Have you tested with `tex.el`?
Your bug report was about Scheme files.
If you see the "same" problem for (La)TeX files, I think it would be
best to open a new bug report for it.
IIRC, `font-lock--syntax-table-affects-ppss` can't be nil in
`latex-mode` (or at least it's not clear how to do that without breaking
something) because of how $...$ is paired (which doesn't always obey the
nesting of braces).
Stefan
bug-gnu-emacs <at> gnu.org:bug#74281; Package emacs.
(Mon, 30 Dec 2024 05:36:02 GMT) Full text and rfc822 format available.Message #68 received at submit <at> debbugs.gnu.org (full text, mbox):
From: Divya Ranjan <divya <at> subvertising.org> To: Stefan Monnier <monnier <at> iro.umontreal.ca>, "Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org> Cc: Eli Zaretskii <eliz <at> gnu.org>, 74281 <at> debbugs.gnu.org Subject: Re: bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file Date: Mon, 30 Dec 2024 05:35:48 +0000
[Message part 1 (text/plain, inline)]
Apologies, I mistyped during travelling, the file I was referring to was the original file of the bug report. `tex.scm` is the file from the Guix source tree: /gnu/packages/tex.scm Regards, On 30 December 2024 04:45:19 GMT, "Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org> wrote: >> I recently did a build of `master`, I don't think the bug was fixed. >> Have you tested with `tex.el`? > >Your bug report was about Scheme files. >If you see the "same" problem for (La)TeX files, I think it would be >best to open a new bug report for it. > >IIRC, `font-lock--syntax-table-affects-ppss` can't be nil in >`latex-mode` (or at least it's not clear how to do that without breaking >something) because of how $...$ is paired (which doesn't always obey the >nesting of braces). > > > Stefan > > > > Divya Ranjan, Mathematics, Philosophy and Libre Software
[Message part 2 (text/html, inline)]
bug-gnu-emacs <at> gnu.org:bug#74281; Package emacs.
(Mon, 30 Dec 2024 05:37:02 GMT) Full text and rfc822 format available.bug-gnu-emacs <at> gnu.org:bug#74281; Package emacs.
(Mon, 30 Dec 2024 12:48:02 GMT) Full text and rfc822 format available.Message #74 received at 74281 <at> debbugs.gnu.org (full text, mbox):
From: Eli Zaretskii <eliz <at> gnu.org> To: Stefan Monnier <monnier <at> iro.umontreal.ca> Cc: divya <at> subvertising.org, 74281 <at> debbugs.gnu.org Subject: Re: bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file Date: Mon, 30 Dec 2024 14:47:15 +0200
> From: Stefan Monnier <monnier <at> iro.umontreal.ca> > Cc: divya <at> subvertising.org, 74281 <at> debbugs.gnu.org > Date: Sun, 29 Dec 2024 15:01:49 -0500 > > This said, AFAICT this performance problem has been with us since > Emacs-28 (commit cdadb7a97cbe), so it's not super urgent to fix it. > I think we're fine with the fix on `master`. Agreed. We can later consider backporting to Emacs 30.2. > It would be nice to get confirmation from Divya that it does fix the > problem he sees. Right.
bug-gnu-emacs <at> gnu.org:bug#74281; Package emacs.
(Mon, 30 Dec 2024 21:07:01 GMT) Full text and rfc822 format available.Message #77 received at 74281 <at> debbugs.gnu.org (full text, mbox):
From: Stefan Monnier <monnier <at> iro.umontreal.ca> To: Divya Ranjan <divya <at> subvertising.org> Cc: eliz <at> gnu.org, 74281 <at> debbugs.gnu.org Subject: Re: bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file Date: Mon, 30 Dec 2024 16:06:06 -0500
> Apologies, I mistyped during travelling, the file I was referring to was the
> original file of the bug report. `tex.scm` is the file from the Guix source
> tree: /gnu/packages/tex.scm
Hmm... on my tests, I can reproduce in `emacs-30` the very slow
font-locking you described when we're at the end of the buffer, but not
on `master`. Just to confirm that you're running the "right" code, can
you do `M-: font-lock--syntax-table-affects-ppss RET` from within that
`tex.scm` buffer? It should return nil if my fix was applied. If it
returns t then you're presumably still using the old code (or there's
something else amiss). If it returns something else than nil or t then
there's something else amiss.
FWIW, even with the fix, Emacs is not quite able to keep up with `M-v`
with an auto-repeat of 40/s when done from the end of the buffer, but:
- When I release the key it catches up fairly quickly (hence the "not
quite"). So I wouldn't describe it as "hangs".
- This is on my 16 years old 2.5GHz Core 2 Duo (Thinkpad T61).
- It's an Emacs compiled with `-Og` and with `--enable-checking`.
Stefan
bug-gnu-emacs <at> gnu.org:bug#74281; Package emacs.
(Thu, 02 Jan 2025 14:13:01 GMT) Full text and rfc822 format available.Message #80 received at submit <at> debbugs.gnu.org (full text, mbox):
From: divya <at> subvertising.org To: bug-gnu-emacs <at> gnu.org Subject: Re: bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file Date: Thu, 02 Jan 2025 14:12:06 +0000
Hello again Stefan and Happy GNU/Year. > Hmm... on my tests, I can reproduce in `emacs-30` the very slow > font-locking you described when we're at the end of the buffer, but not > on `master`. Just to confirm that you're running the "right" code, can > you do `M-: font-lock--syntax-table-affects-ppss RET` from within that > `tex.scm` buffer? It should return nil if my fix was applied. If it > returns t then you're presumably still using the old code (or there's > something else amiss). If it returns something else than nil or t then > there's something else amiss. I just checked and my compiled build was of an older commit. The variable was set `t`. I built from the latest commit and indeed now I can scroll flawlessly in the reported file. > FWIW, even with the fix, Emacs is not quite able to keep up with `M-v` > with an auto-repeat of 40/s when done from the end of the buffer, but: > - When I release the key it catches up fairly quickly (hence the "not > quite"). So I wouldn't describe it as "hangs". > - This is on my 16 years old 2.5GHz Core 2 Duo (Thinkpad T61). > - It's an Emacs compiled with `-Og` and with `--enable-checking`. That's reasonable for the system. I do not notice any sort of lag with `M-v` on my system (Ryzen 7 5700G). Thank you Eli and Stefan for the prompt fix. Really admire the work you guys do. Regards, Divya Ranjan, Mathematics, Philosophy and Libre Software
bug-gnu-emacs <at> gnu.org:bug#74281; Package emacs.
(Sat, 04 Jan 2025 13:11:01 GMT) Full text and rfc822 format available.Message #83 received at 74281 <at> debbugs.gnu.org (full text, mbox):
From: Eli Zaretskii <eliz <at> gnu.org> To: divya <at> subvertising.org, Stefan Monnier <monnier <at> iro.umontreal.ca> Cc: 74281 <at> debbugs.gnu.org Subject: Re: bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file Date: Sat, 04 Jan 2025 15:10:06 +0200
> Date: Thu, 02 Jan 2025 14:12:06 +0000 > From: divya--- via "Bug reports for GNU Emacs, > the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org> > > Hello again Stefan and Happy GNU/Year. > > > Hmm... on my tests, I can reproduce in `emacs-30` the very slow > > font-locking you described when we're at the end of the buffer, but not > > on `master`. Just to confirm that you're running the "right" code, can > > you do `M-: font-lock--syntax-table-affects-ppss RET` from within that > > `tex.scm` buffer? It should return nil if my fix was applied. If it > > returns t then you're presumably still using the old code (or there's > > something else amiss). If it returns something else than nil or t then > > there's something else amiss. > > I just checked and my compiled build was of an older commit. The > variable was set `t`. I built from the latest commit and indeed now I > can scroll flawlessly in the reported file. > > > FWIW, even with the fix, Emacs is not quite able to keep up with `M-v` > > with an auto-repeat of 40/s when done from the end of the buffer, but: > > - When I release the key it catches up fairly quickly (hence the "not > > quite"). So I wouldn't describe it as "hangs". > > - This is on my 16 years old 2.5GHz Core 2 Duo (Thinkpad T61). > > - It's an Emacs compiled with `-Og` and with `--enable-checking`. > > That's reasonable for the system. I do not notice any sort of lag with > `M-v` on my system (Ryzen 7 5700G). > > Thank you Eli and Stefan for the prompt fix. Really admire the work you > guys do. So should we now close this bug?
Stefan Monnier <monnier <at> iro.umontreal.ca>:Divya Ranjan <divya <at> subvertising.org>:Message #88 received at 74281-done <at> debbugs.gnu.org (full text, mbox):
From: Stefan Monnier <monnier <at> iro.umontreal.ca> To: Eli Zaretskii <eliz <at> gnu.org> Cc: 74281-done <at> debbugs.gnu.org, divya <at> subvertising.org Subject: Re: bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file Date: Sat, 04 Jan 2025 09:54:30 -0500
>> I just checked and my compiled build was of an older commit. The
>> variable was set `t`. I built from the latest commit and indeed now I
>> can scroll flawlessly in the reported file.
Excellent, thanks for the confirmation!
> So should we now close this bug?
Yes, closing,
Stefan
Debbugs Internal Request <help-debbugs <at> gnu.org>
to internal_control <at> debbugs.gnu.org.
(Sun, 02 Feb 2025 12:24:18 GMT) Full text and rfc822 format available.
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