* bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file
@ 2024-11-09 16:04 Divya Ranjan via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-11-14 8:44 ` Eli Zaretskii
0 siblings, 1 reply; 9+ messages in thread
From: Divya Ranjan via Bug reports for GNU Emacs, the Swiss army knife of text editors @ 2024-11-09 16:04 UTC (permalink / raw)
To: 74281
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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:
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/home/divya/.emacs.d/straight/build/soap-client/soap-client hides /gnu/store/k3vqb6f4ghi2v50zrzh3657dywfkyfc5-emacs-next-30.0.91-1.9a1c76b/share/emacs/30.0.91/lisp/net/soap-client
/home/divya/.emacs.d/straight/build/seq/seq hides /gnu/store/k3vqb6f4ghi2v50zrzh3657dywfkyfc5-emacs-next-30.0.91-1.9a1c76b/share/emacs/30.0.91/lisp/emacs-lisp/seq
/home/divya/.emacs.d/straight/build/map/map hides /gnu/store/k3vqb6f4ghi2v50zrzh3657dywfkyfc5-emacs-next-30.0.91-1.9a1c76b/share/emacs/30.0.91/lisp/emacs-lisp/map
/home/divya/.emacs.d/straight/build/let-alist/let-alist hides /gnu/store/k3vqb6f4ghi2v50zrzh3657dywfkyfc5-emacs-next-30.0.91-1.9a1c76b/share/emacs/30.0.91/lisp/emacs-lisp/let-alist
/home/divya/.emacs.d/straight/build/compat/compat hides /gnu/store/k3vqb6f4ghi2v50zrzh3657dywfkyfc5-emacs-next-30.0.91-1.9a1c76b/share/emacs/30.0.91/lisp/emacs-lisp/compat
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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.
^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file
2024-11-09 16:04 bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file Divya Ranjan via Bug reports for GNU Emacs, the Swiss army knife of text editors
@ 2024-11-14 8:44 ` Eli Zaretskii
2024-11-14 9:32 ` Divya Ranjan via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-11-14 16:56 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
0 siblings, 2 replies; 9+ messages in thread
From: Eli Zaretskii @ 2024-11-14 8:44 UTC (permalink / raw)
To: Divya Ranjan, Stefan Monnier; +Cc: 74281
> 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@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
^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file
2024-11-14 8:44 ` Eli Zaretskii
@ 2024-11-14 9:32 ` Divya Ranjan via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-11-14 10:06 ` Eli Zaretskii
2024-11-14 16:56 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
1 sibling, 1 reply; 9+ messages in thread
From: Divya Ranjan via Bug reports for GNU Emacs, the Swiss army knife of text editors @ 2024-11-14 9:32 UTC (permalink / raw)
To: Eli Zaretskii; +Cc: Stefan Monnier, 74281
Hello, Eli
Eli Zaretskii <eliz@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@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.
^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file
2024-11-14 9:32 ` Divya Ranjan via Bug reports for GNU Emacs, the Swiss army knife of text editors
@ 2024-11-14 10:06 ` Eli Zaretskii
2024-11-14 11:09 ` Divya Ranjan via Bug reports for GNU Emacs, the Swiss army knife of text editors
0 siblings, 1 reply; 9+ messages in thread
From: Eli Zaretskii @ 2024-11-14 10:06 UTC (permalink / raw)
To: Divya Ranjan; +Cc: monnier, 74281
> From: Divya Ranjan <divya@subvertising.org>
> Cc: Stefan Monnier <monnier@iro.umontreal.ca>, 74281@debbugs.gnu.org
> Date: Thu, 14 Nov 2024 09:32:12 +0000
>
> Hello, Eli
>
> Eli Zaretskii <eliz@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@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?
^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file
2024-11-14 10:06 ` Eli Zaretskii
@ 2024-11-14 11:09 ` Divya Ranjan via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-11-14 11:42 ` Eli Zaretskii
0 siblings, 1 reply; 9+ messages in thread
From: Divya Ranjan via Bug reports for GNU Emacs, the Swiss army knife of text editors @ 2024-11-14 11:09 UTC (permalink / raw)
To: 74281, eliz; +Cc: monnier
[-- Attachment #1: Type: text/plain, Size: 1437 bytes --]
> 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@gnu.org> wrote:
>> From: Divya Ranjan <divya@subvertising.org>
>> Cc: Stefan Monnier <monnier@iro.umontreal.ca>, 74281@debbugs.gnu.org
>> Date: Thu, 14 Nov 2024 09:32:12 +0000
>>
>> Hello, Eli
>>
>> Eli Zaretskii <eliz@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@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
[-- Attachment #2: Type: text/html, Size: 2248 bytes --]
^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file
2024-11-14 11:09 ` Divya Ranjan via Bug reports for GNU Emacs, the Swiss army knife of text editors
@ 2024-11-14 11:42 ` Eli Zaretskii
0 siblings, 0 replies; 9+ messages in thread
From: Eli Zaretskii @ 2024-11-14 11:42 UTC (permalink / raw)
To: Divya Ranjan; +Cc: monnier, 74281
> Date: Thu, 14 Nov 2024 11:09:41 +0000
> From: Divya Ranjan <divya@subvertising.org>
> CC: monnier@iro.umontreal.ca, 74281@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.
^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file
2024-11-14 8:44 ` Eli Zaretskii
2024-11-14 9:32 ` Divya Ranjan via Bug reports for GNU Emacs, the Swiss army knife of text editors
@ 2024-11-14 16:56 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-11-30 9:51 ` Eli Zaretskii
1 sibling, 1 reply; 9+ messages in thread
From: Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors @ 2024-11-14 16:56 UTC (permalink / raw)
To: Eli Zaretskii; +Cc: Divya Ranjan, 74281
> 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.
^ permalink raw reply related [flat|nested] 9+ messages in thread
* bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file
2024-11-14 16:56 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
@ 2024-11-30 9:51 ` Eli Zaretskii
2024-12-14 9:34 ` Eli Zaretskii
0 siblings, 1 reply; 9+ messages in thread
From: Eli Zaretskii @ 2024-11-30 9:51 UTC (permalink / raw)
To: divya, Stefan Monnier; +Cc: 74281
Ping! Divya, could you please try Stefan's suggestions and report
back?
> Cc: Divya Ranjan <divya@subvertising.org>, 74281@debbugs.gnu.org
> From: Stefan Monnier <monnier@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.
>
>
>
>
>
^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file
2024-11-30 9:51 ` Eli Zaretskii
@ 2024-12-14 9:34 ` Eli Zaretskii
0 siblings, 0 replies; 9+ messages in thread
From: Eli Zaretskii @ 2024-12-14 9:34 UTC (permalink / raw)
To: divya; +Cc: monnier, 74281
Ping! Ping! Divya, are you there?
> Cc: 74281@debbugs.gnu.org
> Date: Sat, 30 Nov 2024 11:51:49 +0200
> From: Eli Zaretskii <eliz@gnu.org>
>
> Ping! Divya, could you please try Stefan's suggestions and report
> back?
>
> > Cc: Divya Ranjan <divya@subvertising.org>, 74281@debbugs.gnu.org
> > From: Stefan Monnier <monnier@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.
> >
> >
> >
> >
> >
>
>
>
>
^ permalink raw reply [flat|nested] 9+ messages in thread
end of thread, other threads:[~2024-12-14 9:34 UTC | newest]
Thread overview: 9+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2024-11-09 16:04 bug#74281: 30.0.91; font-lock mode hangs on scrolling large Scheme file Divya Ranjan via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-11-14 8:44 ` Eli Zaretskii
2024-11-14 9:32 ` Divya Ranjan via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-11-14 10:06 ` Eli Zaretskii
2024-11-14 11:09 ` Divya Ranjan via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-11-14 11:42 ` Eli Zaretskii
2024-11-14 16:56 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-11-30 9:51 ` Eli Zaretskii
2024-12-14 9:34 ` Eli Zaretskii
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