bug#67977: 30.0.50; tree-sitter: Emacs crashes when accessing treesit-nodes in a narrowed buffer

bug#67977: 30.0.50; tree-sitter: Emacs crashes when accessing treesit-nodes in a narrowed buffer

[Denis Zubarev]

Steps to reproduce:
1. emacs -Q
2. M-x find-file /tmp/t.py
3. paste there
start=1
def _init(self, param1, param2, param3=False):
    self._param1 = param2
    self._param2 = param2
    self._param3 = param3
4. python-ts-mode
5. select two last lines and M-x narrow-to-region
6. answer all prompts
7. Put cursor on the last self
8. M-x eval-expression
(progn
(setq temp-node (treesit-node-at (point)))
(sit-for 2)
(garbage-collect)
(message "node %s" temp-node))
9. Emacs crashes or prints node that contains garbage
It should print "node #<treesit-node identifier in 112-116>"
It works ok in the widen buffer or if the whole function is narrowed.

Lisp Backtrace:
"message" (0xffffc0c0)
"progn" (0xffffc1e0)
"eval" (0xffffc338)
"eval-expression" (0xffffc440)
"funcall-interactively" (0xffffc438)
"command-execute" (0xffffc7b8)
"execute-extended-command" (0xffffc8f0)
"funcall-interactively" (0xffffc8e8)
"command-execute" (0xffffcc18)

bt:
#0  0x00007ffff338c4f4 in ts_language_symbol_count () at /usr/local/lib/libtree-sitter.so.0
#1  0x00007ffff338c81e in ts_language_symbol_name () at /usr/local/lib/libtree-sitter.so.0
#2  0x0000555555806920 in Ftreesit_node_type (node=node@entry=XIL(0x555556de81d5)) at treesit.c:1864
#3  0x00005555557a3b91 in print_vectorlike_unreadable (buf=0x7fffffff6590 "", escapeflag=false, printcharfun=XIL(0), obj=<optimized out>) at print.c:2049
#4  print_object (obj=<optimized out>, printcharfun=XIL(0), escapeflag=false) at print.c:2633
#5  0x00005555557a4742 in Fprin1_to_string (object=XIL(0x555556de81d5), noescape=XIL(0x30), overrides=overrides@entry=XIL(0)) at print.c:813
#6  0x000055555576f3e8 in styled_format (nargs=<optimized out>, args=<optimized out>, message=<optimized out>) at editfns.c:3662
#7  0x00005555557702e9 in Fformat_message (args=0x7fffffffc0c0, nargs=<optimized out>) at editfns.c:3415
#8  Fmessage (args=0x7fffffffc0c0, nargs=<optimized out>) at editfns.c:3212
#9  Fmessage (nargs=<optimized out>, args=0x7fffffffc0c0) at editfns.c:3181

print treesit_node from frame #2:

$1 = {
  context = {4294928528, 32767, 4294928440, 32767},
  id = 0x7fff20ff67e0,
  tree = 0x5555557a0efc <strout+572>
}




In GNU Emacs 30.0.50 (build 3, x86_64-pc-linux-gnu, GTK+ Version
 3.24.33, cairo version 1.16.0) of 2023-12-23 built on NUC-here
Repository revision: 9c86dd52475e0ad65359bc964fbe0d62b9d3e464
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101004
System Description: Ubuntu 22.04.3 LTS

Configured using:
 'configure --with-modules --with-native-compilation=aot
 --with-imagemagick --with-json --with-tree-sitter --with-xft'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ
IMAGEMAGICK JPEG JSON LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2
M17N_FLT MODULES NATIVE_COMP NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP
SOUND THREADS TIFF TOOLKIT_SCROLL_BARS TREE_SITTER X11 XDBE XIM XINPUT2
XPM GTK3 ZLIB

Important settings:
  value of $LC_MONETARY: ru_RU.UTF-8
  value of $LC_NUMERIC: ru_RU.UTF-8
  value of $LC_TIME: ru_RU.UTF-8
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Debbugs

Minor modes in effect:
  winum-mode: t
  global-anzu-mode: t
  anzu-mode: t
  dap-tooltip-mode: t
  dap-ui-many-windows-mode: t
  dap-ui-mode: t
  treemacs-filewatch-mode: t
  treemacs-git-mode: t
  treemacs-fringe-indicator-mode: t
  dap-auto-configure-mode: t
  dap-mode: t
  save-place-mode: t
  global-so-long-mode: t
  global-git-commit-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  recentf-mode: t
  projectile-mode: t
  header-line-indent-mode: t
  which-key-mode: t
  savehist-mode: t
  better-jumper-mode: t
  better-jumper-local-mode: t
  global-company-mode: t
  company-mode: t
  vertico-mode: t
  marginalia-mode: t
  evil-goggles-mode: t
  evil-escape-mode: t
  evil-snipe-override-mode: t
  evil-snipe-mode: t
  pcre-mode: t
  server-mode: t
  gcmh-mode: t
  global-hl-line-mode: t
  hl-line-mode: t
  winner-mode: t
  smartparens-global-mode: t
  ws-butler-global-mode: t
  undo-fu-session-global-mode: t
  undo-fu-mode: t
  global-flycheck-mode: t
  persp-mode: t
  doom-modeline-mode: t
  solaire-global-mode: t
  solaire-mode: t
  hexl-follow-ascii: t
  global-evil-surround-mode: t
  evil-surround-mode: t
  dirvish-override-dired-mode: t
  direnv-mode: t
  +lsp-optimization-mode: t
  evil-mode: t
  evil-local-mode: t
  +popup-mode: t
  override-global-mode: t
  general-override-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  window-divider-mode: t
  minibuffer-regexp-mode: t
  buffer-read-only: t
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

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bug#67977: 30.0.50; tree-sitter: Emacs crashes when accessing treesit-nodes in a narrowed buffer

[Eli Zaretskii]

> From: Denis Zubarev <dvzubarev@yandex.ru>
> Date: Sat, 23 Dec 2023 02:18:20 +0300
> 
> 1. emacs -Q
> 2. M-x find-file /tmp/t.py
> 3. paste there
> start=1
> def _init(self, param1, param2, param3=False):
>     self._param1 = param2
>     self._param2 = param2
>     self._param3 = param3
> 4. python-ts-mode
> 5. select two last lines and M-x narrow-to-region
> 6. answer all prompts
> 7. Put cursor on the last self
> 8. M-x eval-expression
> (progn
> (setq temp-node (treesit-node-at (point)))
> (sit-for 2)
> (garbage-collect)
> (message "node %s" temp-node))
> 9. Emacs crashes or prints node that contains garbage

Thanks.

Yuan, this also happens on the emacs-29 branch, so we should try
fixing this crash ASAP.

bug#67977: 30.0.50; tree-sitter: Emacs crashes when accessing treesit-nodes in a narrowed buffer

[Yuan Fu]

> On Dec 22, 2023, at 11:26 PM, Eli Zaretskii <eliz@gnu.org> wrote:
> 
>> From: Denis Zubarev <dvzubarev@yandex.ru>
>> Date: Sat, 23 Dec 2023 02:18:20 +0300
>> 
>> 1. emacs -Q
>> 2. M-x find-file /tmp/t.py
>> 3. paste there
>> start=1
>> def _init(self, param1, param2, param3=False):
>>    self._param1 = param2
>>    self._param2 = param2
>>    self._param3 = param3
>> 4. python-ts-mode
>> 5. select two last lines and M-x narrow-to-region
>> 6. answer all prompts
>> 7. Put cursor on the last self
>> 8. M-x eval-expression
>> (progn
>> (setq temp-node (treesit-node-at (point)))
>> (sit-for 2)
>> (garbage-collect)
>> (message "node %s" temp-node))
>> 9. Emacs crashes or prints node that contains garbage
> 
> Thanks.
> 
> Yuan, this also happens on the emacs-29 branch, so we should try
> fixing this crash ASAP.

Yeah. The node wants to print it’s type name (with ts_node_type), which access it’s parse tree, but the tree is already freed, that means the node is outdated and shouldn’t try to print it’s type name, but should rather print “outdated”.

But simply narrowing the buffer shouldn’t reparse the buffer and cause the parse tree to be freed. Anyway, let me see what’s going on.

Yuan

bug#67977: 30.0.50; tree-sitter: Emacs crashes when accessing treesit-nodes in a narrowed buffer

[Yuan Fu]

> On Dec 23, 2023, at 12:08 AM, Yuan Fu <casouri@gmail.com> wrote:
> 
> 
> 
>> On Dec 22, 2023, at 11:26 PM, Eli Zaretskii <eliz@gnu.org> wrote:
>> 
>>> From: Denis Zubarev <dvzubarev@yandex.ru>
>>> Date: Sat, 23 Dec 2023 02:18:20 +0300
>>> 
>>> 1. emacs -Q
>>> 2. M-x find-file /tmp/t.py
>>> 3. paste there
>>> start=1
>>> def _init(self, param1, param2, param3=False):
>>>   self._param1 = param2
>>>   self._param2 = param2
>>>   self._param3 = param3
>>> 4. python-ts-mode
>>> 5. select two last lines and M-x narrow-to-region
>>> 6. answer all prompts
>>> 7. Put cursor on the last self
>>> 8. M-x eval-expression
>>> (progn
>>> (setq temp-node (treesit-node-at (point)))
>>> (sit-for 2)
>>> (garbage-collect)
>>> (message "node %s" temp-node))
>>> 9. Emacs crashes or prints node that contains garbage
>> 
>> Thanks.
>> 
>> Yuan, this also happens on the emacs-29 branch, so we should try
>> fixing this crash ASAP.
> 
> Yeah. The node wants to print it’s type name (with ts_node_type), which access it’s parse tree, but the tree is already freed, that means the node is outdated and shouldn’t try to print it’s type name, but should rather print “outdated”.
> 
> But simply narrowing the buffer shouldn’t reparse the buffer and cause the parse tree to be freed. Anyway, let me see what’s going on.


I pushed a fix and now it shouldn’t crash anymore. However, I’m yet not sure why at some point the buffer was widened. Is there any way to track who called widen?

Yuan

bug#67977: 30.0.50; tree-sitter: Emacs crashes when accessing treesit-nodes in a narrowed buffer

[Eli Zaretskii]

> From: Yuan Fu <casouri@gmail.com>
> Date: Sat, 23 Dec 2023 19:00:34 -0800
> Cc: Denis Zubarev <dvzubarev@yandex.ru>,
>  67977@debbugs.gnu.org
> 
> >> Yuan, this also happens on the emacs-29 branch, so we should try
> >> fixing this crash ASAP.
> > 
> > Yeah. The node wants to print it’s type name (with ts_node_type), which access it’s parse tree, but the tree is already freed, that means the node is outdated and shouldn’t try to print it’s type name, but should rather print “outdated”.
> > 
> > But simply narrowing the buffer shouldn’t reparse the buffer and cause the parse tree to be freed. Anyway, let me see what’s going on.
> 
> 
> I pushed a fix and now it shouldn’t crash anymore. However, I’m yet not sure why at some point the buffer was widened. Is there any way to track who called widen?

Run Emacs under GDB with a breakpoint at Fwiden, then look at the
backtrace.  The command "xbacktrace", defined on src/.gdbinit, will
show a Lisp backtrace as well.

But I already did the above, and the answer is the expected one: it's
JIT font-lock, which calls font-lock-fontify-region, which does:

    (save-restriction
      (unless font-lock-dont-widen (widen))

And if you leave blink-cursor-mode and global-eldoc-mode on (which is
the default), you have also another caller: jit-lock-context-fontify
(which is called from a timer).

Does this answer your question?

Btw, I hope that these calls to 'widen' don't require unnecessary
reparsing by tree-sitter, do they?

bug#67977: 30.0.50; tree-sitter: Emacs crashes when accessing treesit-nodes in a narrowed buffer

[Yuan Fu]

> On Dec 23, 2023, at 11:11 PM, Eli Zaretskii <eliz@gnu.org> wrote:
> 
>> From: Yuan Fu <casouri@gmail.com>
>> Date: Sat, 23 Dec 2023 19:00:34 -0800
>> Cc: Denis Zubarev <dvzubarev@yandex.ru>,
>> 67977@debbugs.gnu.org
>> 
>>>> Yuan, this also happens on the emacs-29 branch, so we should try
>>>> fixing this crash ASAP.
>>> 
>>> Yeah. The node wants to print it’s type name (with ts_node_type), which access it’s parse tree, but the tree is already freed, that means the node is outdated and shouldn’t try to print it’s type name, but should rather print “outdated”.
>>> 
>>> But simply narrowing the buffer shouldn’t reparse the buffer and cause the parse tree to be freed. Anyway, let me see what’s going on.
>> 
>> 
>> I pushed a fix and now it shouldn’t crash anymore. However, I’m yet not sure why at some point the buffer was widened. Is there any way to track who called widen?
> 
> Run Emacs under GDB with a breakpoint at Fwiden, then look at the
> backtrace.  The command "xbacktrace", defined on src/.gdbinit, will
> show a Lisp backtrace as well.
> 
> But I already did the above, and the answer is the expected one: it's
> JIT font-lock, which calls font-lock-fontify-region, which does:
> 
>    (save-restriction
>      (unless font-lock-dont-widen (widen))
> 
> And if you leave blink-cursor-mode and global-eldoc-mode on (which is
> the default), you have also another caller: jit-lock-context-fontify
> (which is called from a timer).
> 
> Does this answer your question?

Yes, they do. Many thanks!

> Btw, I hope that these calls to 'widen' don't require unnecessary
> reparsing by tree-sitter, do they?

Yes, but only because we called treesit-node-at while the buffer is narrowed, which triggers a reparse. Font-lock and jit-lock themselves always access the parser with widened buffer so they don’t trigger reparse on their own. 

So it seems working in a narrowed buffer would trigger a lot of back-and-fortch reparse. I wonder if it’s worth optimizing for (eg, use two parsers behind the scenes, one for widened buffer and one for narrowed buffer).

Yuan

bug#67977: 30.0.50; tree-sitter: Emacs crashes when accessing treesit-nodes in a narrowed buffer

[Eli Zaretskii]

> From: Yuan Fu <casouri@gmail.com>
> Date: Tue, 26 Dec 2023 20:15:24 -0800
> Cc: Denis Zubarev <dvzubarev@yandex.ru>,
>  67977@debbugs.gnu.org
> 
> > Btw, I hope that these calls to 'widen' don't require unnecessary
> > reparsing by tree-sitter, do they?
> 
> Yes, but only because we called treesit-node-at while the buffer is narrowed, which triggers a reparse. Font-lock and jit-lock themselves always access the parser with widened buffer so they don’t trigger reparse on their own. 
> 
> So it seems working in a narrowed buffer would trigger a lot of back-and-fortch reparse. I wonder if it’s worth optimizing for (eg, use two parsers behind the scenes, one for widened buffer and one for narrowed buffer).

Could font-lock-dont-widen help, perhaps?

bug#67977: 30.0.50; tree-sitter: Emacs crashes when accessing treesit-nodes in a narrowed buffer

[Yuan Fu]

> On Dec 27, 2023, at 4:57 AM, Eli Zaretskii <eliz@gnu.org> wrote:
> 
>> From: Yuan Fu <casouri@gmail.com>
>> Date: Tue, 26 Dec 2023 20:15:24 -0800
>> Cc: Denis Zubarev <dvzubarev@yandex.ru>,
>> 67977@debbugs.gnu.org
>> 
>>> Btw, I hope that these calls to 'widen' don't require unnecessary
>>> reparsing by tree-sitter, do they?
>> 
>> Yes, but only because we called treesit-node-at while the buffer is narrowed, which triggers a reparse. Font-lock and jit-lock themselves always access the parser with widened buffer so they don’t trigger reparse on their own. 
>> 
>> So it seems working in a narrowed buffer would trigger a lot of back-and-fortch reparse. I wonder if it’s worth optimizing for (eg, use two parsers behind the scenes, one for widened buffer and one for narrowed buffer).
> 
> Could font-lock-dont-widen help, perhaps?

Yes. If font-lock doesn’t widen, then there wouldn’t be back-and-forth reparses. 

Yuan

bug#67977: 30.0.50; tree-sitter: Emacs crashes when accessing treesit-nodes in a narrowed buffer

[Dmitry Gutov]

On 28/12/2023 10:07, Yuan Fu wrote:
> 
>> On Dec 27, 2023, at 4:57 AM, Eli Zaretskii<eliz@gnu.org>  wrote:
>>
>>> From: Yuan Fu<casouri@gmail.com>
>>> Date: Tue, 26 Dec 2023 20:15:24 -0800
>>> Cc: Denis Zubarev<dvzubarev@yandex.ru>,
>>> 67977@debbugs.gnu.org
>>>
>>>> Btw, I hope that these calls to 'widen' don't require unnecessary
>>>> reparsing by tree-sitter, do they?
>>> Yes, but only because we called treesit-node-at while the buffer is narrowed, which triggers a reparse. Font-lock and jit-lock themselves always access the parser with widened buffer so they don’t trigger reparse on their own.
>>>
>>> So it seems working in a narrowed buffer would trigger a lot of back-and-fortch reparse. I wonder if it’s worth optimizing for (eg, use two parsers behind the scenes, one for widened buffer and one for narrowed buffer).
>> Could font-lock-dont-widen help, perhaps?
> Yes. If font-lock doesn’t widen, then there wouldn’t be back-and-forth reparses.

But then treesit major modes will be affected by user narrowing (e.g. if 
the user narrowed to inside the string, the buffer won't be highlighted 
as a string).

bug#67977: 30.0.50; tree-sitter: Emacs crashes when accessing treesit-nodes in a narrowed buffer

[Eli Zaretskii]

> Date: Thu, 28 Dec 2023 13:44:43 +0200
> Cc: Denis Zubarev <dvzubarev@yandex.ru>, 67977@debbugs.gnu.org
> From: Dmitry Gutov <dmitry@gutov.dev>
> 
> >> Could font-lock-dont-widen help, perhaps?
> > Yes. If font-lock doesn’t widen, then there wouldn’t be back-and-forth reparses.
> 
> But then treesit major modes will be affected by user narrowing (e.g. if 
> the user narrowed to inside the string, the buffer won't be highlighted 
> as a string).

Why is that a problem?  When the user narrows the buffer, the part
outside the narrowing doesn't exist as far as Emacs is concerned.

bug#67977: 30.0.50; tree-sitter: Emacs crashes when accessing treesit-nodes in a narrowed buffer

[Dmitry Gutov]

On 28/12/2023 15:53, Eli Zaretskii wrote:
>> Date: Thu, 28 Dec 2023 13:44:43 +0200
>> Cc: Denis Zubarev<dvzubarev@yandex.ru>,67977@debbugs.gnu.org
>> From: Dmitry Gutov<dmitry@gutov.dev>
>>
>>>> Could font-lock-dont-widen help, perhaps?
>>> Yes. If font-lock doesn’t widen, then there wouldn’t be back-and-forth reparses.
>> But then treesit major modes will be affected by user narrowing (e.g. if
>> the user narrowed to inside the string, the buffer won't be highlighted
>> as a string).
> Why is that a problem?  When the user narrows the buffer, the part
> outside the narrowing doesn't exist as far as Emacs is concerned.

That's not how it works in most major modes, at least since the 
introduction of font-lock-dont-widen 20 years ago.

Like its docstring says, the exceptions were supposed to be weird modes 
like RMAIL and Info which use narrowing for their own purposes (that 
seems buggy in Info's case, when 'C-x n w' breaks the intended display 
right away). But even Info-mode doesn't actually change 
font-lock-dont-widen, actually, because the apparent behavior would be 
the same. But it could.

I don't have a personal stake in this (I never use narrowing 
interactively). But maybe you'll want to make a poll, to ask the users 
that do.

bug#67977: 30.0.50; tree-sitter: Emacs crashes when accessing treesit-nodes in a narrowed buffer

[Yuan Fu]

> On Dec 28, 2023, at 8:16 AM, Dmitry Gutov <dmitry@gutov.dev> wrote:
> 
> On 28/12/2023 15:53, Eli Zaretskii wrote:
>>> Date: Thu, 28 Dec 2023 13:44:43 +0200
>>> Cc: Denis Zubarev<dvzubarev@yandex.ru>,67977@debbugs.gnu.org
>>> From: Dmitry Gutov<dmitry@gutov.dev>
>>> 
>>>>> Could font-lock-dont-widen help, perhaps?
>>>> Yes. If font-lock doesn’t widen, then there wouldn’t be back-and-forth reparses.
>>> But then treesit major modes will be affected by user narrowing (e.g. if
>>> the user narrowed to inside the string, the buffer won't be highlighted
>>> as a string).
>> Why is that a problem?  When the user narrows the buffer, the part
>> outside the narrowing doesn't exist as far as Emacs is concerned.
> 
> That's not how it works in most major modes, at least since the introduction of font-lock-dont-widen 20 years ago.
> 
> Like its docstring says, the exceptions were supposed to be weird modes like RMAIL and Info which use narrowing for their own purposes (that seems buggy in Info's case, when 'C-x n w' breaks the intended display right away). But even Info-mode doesn't actually change font-lock-dont-widen, actually, because the apparent behavior would be the same. But it could.
> 
> I don't have a personal stake in this (I never use narrowing interactively). But maybe you'll want to make a poll, to ask the users that do.

I guess that depends on how you view narrowing, I assume most of the time the user considers narrowing to be something that narrows the view to a region, rather than effectively removing the rest of the buffer. IIRC We’ve had discussions on adding “types” to narrows but to no conclusion.

Anyway, if the reparse caused by narrowing prove to be problematic, I can implement the optimization I mentioned earlier, where we use two parsers, one for when buffer is widened and one for when buffer is narrowed. This will be in C and is transparent to lisp.

Yuan

bug#67977: 30.0.50; tree-sitter: Emacs crashes when accessing treesit-nodes in a narrowed buffer

[Dmitry Gutov]

On 29/12/2023 09:00, Yuan Fu wrote:
> 
> 
>> On Dec 28, 2023, at 8:16 AM, Dmitry Gutov <dmitry@gutov.dev> wrote:
>>
>> On 28/12/2023 15:53, Eli Zaretskii wrote:
>>>> Date: Thu, 28 Dec 2023 13:44:43 +0200
>>>> Cc: Denis Zubarev<dvzubarev@yandex.ru>,67977@debbugs.gnu.org
>>>> From: Dmitry Gutov<dmitry@gutov.dev>
>>>>
>>>>>> Could font-lock-dont-widen help, perhaps?
>>>>> Yes. If font-lock doesn’t widen, then there wouldn’t be back-and-forth reparses.
>>>> But then treesit major modes will be affected by user narrowing (e.g. if
>>>> the user narrowed to inside the string, the buffer won't be highlighted
>>>> as a string).
>>> Why is that a problem?  When the user narrows the buffer, the part
>>> outside the narrowing doesn't exist as far as Emacs is concerned.
>>
>> That's not how it works in most major modes, at least since the introduction of font-lock-dont-widen 20 years ago.
>>
>> Like its docstring says, the exceptions were supposed to be weird modes like RMAIL and Info which use narrowing for their own purposes (that seems buggy in Info's case, when 'C-x n w' breaks the intended display right away). But even Info-mode doesn't actually change font-lock-dont-widen, actually, because the apparent behavior would be the same. But it could.
>>
>> I don't have a personal stake in this (I never use narrowing interactively). But maybe you'll want to make a poll, to ask the users that do.
> 
> I guess that depends on how you view narrowing, I assume most of the time the user considers narrowing to be something that narrows the view to a region, rather than effectively removing the rest of the buffer. IIRC We’ve had discussions on adding “types” to narrows but to no conclusion.

Indeed.

> Anyway, if the reparse caused by narrowing prove to be problematic, I can implement the optimization I mentioned earlier, where we use two parsers, one for when buffer is widened and one for when buffer is narrowed. This will be in C and is transparent to lisp.

This definitely can work, but perhaps we should examine concrete use 
cases first. It could be that the caller would want the full parse tree 
available anyway, when the view was narrowed interactively by the user.

Then the actual advice from us would be to (save-restriction (widen 
...)) anyway, and the second parse tree would stay mostly unused.

It's a good thing to have fixed the crash, though, so the developers can 
try it both ways and decide what's best for them.

bug#67977: 30.0.50; tree-sitter: Emacs crashes when accessing treesit-nodes in a narrowed buffer

[Yuan Fu]

> On Dec 29, 2023, at 4:48 AM, Dmitry Gutov <dmitry@gutov.dev> wrote:
> 
> On 29/12/2023 09:00, Yuan Fu wrote:
>>> On Dec 28, 2023, at 8:16 AM, Dmitry Gutov <dmitry@gutov.dev> wrote:
>>> 
>>> On 28/12/2023 15:53, Eli Zaretskii wrote:
>>>>> Date: Thu, 28 Dec 2023 13:44:43 +0200
>>>>> Cc: Denis Zubarev<dvzubarev@yandex.ru>,67977@debbugs.gnu.org
>>>>> From: Dmitry Gutov<dmitry@gutov.dev>
>>>>> 
>>>>>>> Could font-lock-dont-widen help, perhaps?
>>>>>> Yes. If font-lock doesn’t widen, then there wouldn’t be back-and-forth reparses.
>>>>> But then treesit major modes will be affected by user narrowing (e.g. if
>>>>> the user narrowed to inside the string, the buffer won't be highlighted
>>>>> as a string).
>>>> Why is that a problem?  When the user narrows the buffer, the part
>>>> outside the narrowing doesn't exist as far as Emacs is concerned.
>>> 
>>> That's not how it works in most major modes, at least since the introduction of font-lock-dont-widen 20 years ago.
>>> 
>>> Like its docstring says, the exceptions were supposed to be weird modes like RMAIL and Info which use narrowing for their own purposes (that seems buggy in Info's case, when 'C-x n w' breaks the intended display right away). But even Info-mode doesn't actually change font-lock-dont-widen, actually, because the apparent behavior would be the same. But it could.
>>> 
>>> I don't have a personal stake in this (I never use narrowing interactively). But maybe you'll want to make a poll, to ask the users that do.
>> I guess that depends on how you view narrowing, I assume most of the time the user considers narrowing to be something that narrows the view to a region, rather than effectively removing the rest of the buffer. IIRC We’ve had discussions on adding “types” to narrows but to no conclusion.
> 
> Indeed.
> 
>> Anyway, if the reparse caused by narrowing prove to be problematic, I can implement the optimization I mentioned earlier, where we use two parsers, one for when buffer is widened and one for when buffer is narrowed. This will be in C and is transparent to lisp.
> 
> This definitely can work, but perhaps we should examine concrete use cases first. It could be that the caller would want the full parse tree available anyway, when the view was narrowed interactively by the user.
> 
> Then the actual advice from us would be to (save-restriction (widen ...)) anyway, and the second parse tree would stay mostly unused.

I’m sure both strict and non-strict narrowing has their use-cases. For movement functions, we probably don’t want to widen; for indentation, I think both could be useful depending on, again, specific use-cases.

I don’t think any of use are motivated enough :-) We can wait until someone with a specific problem/requirement comes up.

> 
> It's a good thing to have fixed the crash, though, so the developers can try it both ways and decide what's best for them.

Right, Lisp programmers can decide whether they want to widen. And if there are enough important use-cases for widening, we can starting thinking about optimizing switching back-and-forth between narrowed and widened buffer.

Yuan

bug#67977: 30.0.50; tree-sitter: Emacs crashes when accessing treesit-nodes in a narrowed buffer

[Denis Zubarev]

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bug#67977: 30.0.50; tree-sitter: Emacs crashes when accessing treesit-nodes in a narrowed buffer

[Yuan Fu]

> On Dec 30, 2023, at 8:21 AM, Denis Zubarev <dvzubarev@yandex.ru> wrote:
> 
> > I pushed a fix and now it shouldn’t crash anymore. However, I’m yet not sure why at some point the buffer was widened. Is there any way to track who called widen?
>  Thank you, It doesn't crash anymore.
>  > So it seems working in a narrowed buffer would trigger a lot of back-and-fortch reparse. I wonder if it’s worth optimizing for (eg, use two parsers behind the scenes, one for widened buffer and one for narrowed buffer).
>  I have performed a quite naive benchmark and haven't seen any significant slow down when inserting text in a narrowed buffer.

Right, when you type, since the only thing that access the parser is font-lock, which always widens the buffer, there’s no unnecessary reparse. If you invoke some function that access the parser while the buffer is narrowed, that’ll trigger a reparse, and the next time font-lock runs, it’ll widen and make the parser reparse the full buffer again.

Yuan

bug#67977: 30.0.50; tree-sitter: Emacs crashes when accessing treesit-nodes in a narrowed buffer

[Dmitry Gutov]

On 30/12/2023 22:23, Yuan Fu wrote:
> 
>> On Dec 30, 2023, at 8:21 AM, Denis Zubarev<dvzubarev@yandex.ru>  wrote:
>>
>>> I pushed a fix and now it shouldn’t crash anymore. However, I’m yet not sure why at some point the buffer was widened. Is there any way to track who called widen?
>>   Thank you, It doesn't crash anymore.
>>   > So it seems working in a narrowed buffer would trigger a lot of back-and-fortch reparse. I wonder if it’s worth optimizing for (eg, use two parsers behind the scenes, one for widened buffer and one for narrowed buffer).
>>   I have performed a quite naive benchmark and haven't seen any significant slow down when inserting text in a narrowed buffer.
> Right, when you type, since the only thing that access the parser is font-lock, which always widens the buffer, there’s no unnecessary reparse. If you invoke some function that access the parser while the buffer is narrowed, that’ll trigger a reparse, and the next time font-lock runs, it’ll widen and make the parser reparse the full buffer again.

The difference might also only be noticeable with larger files: 
tree-sitter is pretty fast by itself, so an extra reparse might not make 
a difference unless it triggers a full re-fontification or application 
of text properties over a large span.

bug#67977: 30.0.50; tree-sitter: Emacs crashes when accessing treesit-nodes in a narrowed buffer

[Denis Zubarev]

[-- Attachment #1: Type: text/html, Size: 4371 bytes --]

bug#67977: 30.0.50; tree-sitter: Emacs crashes when accessing treesit-nodes in a narrowed buffer

[Eli Zaretskii]

> From: Denis Zubarev <dvzubarev@yandex.ru>
> Cc: Eli Zaretskii <eliz@gnu.org>,
> 	"67977@debbugs.gnu.org" <67977@debbugs.gnu.org>
> Date: Sun, 31 Dec 2023 13:39:10 +0300
> 
> Yes, if accessing nodes, then there is a slowdown.
>  
> The result is what benchmark-run returns.
>  
>  # func  buff-size  widen                 narrowed                
> ------------------------------------------------------------------
>       1  671 B      (0.22944 2 0.022735)  (0.520645 9 0.1100442)  
>      11  7 KiB      (0.23176 3 0.038288)  (0.9340281 9 0.116293   
>      31  20 KiB     (0.27746 3 0.039054)  (1.7671007 10 0.134515)
>  
> Also there were errors when running benchmark in the narrowed buffer:
> Error muted by safe_call: (internal--syntax-propertize 1482) signaled (args-out-of-range 1 1872)
> Error muted by safe_call: (internal--syntax-propertize 282) signaled (args-out-of-range 1 672)
> 
>  
> Recipe:
> 1. emacs -Q
> 2. paste the code to the buffer
> 3. M-x python-ts-mode
> 4. put the cursor in the place of |
>  
> 5. M-x eval-expression
>    (require 'benchmark)
>    (benchmark-run 200 (progn (insert "v")  (insert "=") (insert "f") (insert "(") (insert ")") (treesit-node-at
> (point)) (insert "\n") (font-lock-ensure) ))
> 6. M-x undo
>  
> For benchmark in narrowed state select the body of a function, starting from a documentation string
> and M-x narrow-to-region.
>  
> To increase buffer size copy the whole function:
> M-x eval-expression
> (dotimes (_ 10) (yank))
> 
>  
> Code:
> class TempC:
>     def func_call():
>         """documentation
>         """
>         var1 = 3
>         var2 = func(1, temp={'1':1, '2':2},
>                     temp1=TempC([1], [3]), ab='83, 8',)
>         var3= r'\n str'
>         var4 = f'temp {TempC("1"+"3")}|{v + "mon" +v}and {func()}'
>  
>         |
>  
>         varb =832
>         if varb:
>             pass
>         elif not varb is not None and varb == 3:
>             varb = 38
>         else:
>             pass
>  
>         for i in range():
>             print(i)
>  
>         def nested():
>             class Nested(Tempc):
>                 def __init__(self):
>                     self._init = True
>             return Nested()
>         return nested

Adding Stefan to the discussion.

bug#67977: 30.0.50; tree-sitter: Emacs crashes when accessing treesit-nodes in a narrowed buffer

[Dmitry Gutov]

On 31/12/2023 12:39, Denis Zubarev wrote:
> Also there were errors when running benchmark in the narrowed buffer:
> Error muted by safe_call: (internal--syntax-propertize 1482) signaled 
> (args-out-of-range 1 1872)

That does look like a bug.

The patch below seems to fix it:

diff --git a/lisp/treesit.el b/lisp/treesit.el
index 264b95dc3a3..46ebadcf057 100644
--- a/lisp/treesit.el
+++ b/lisp/treesit.el
@@ -1150,7 +1150,7 @@ treesit--pre-syntax-ppss
      (if (and new-start (< new-start start))
          (progn
            (setq treesit--syntax-propertize-start nil)
-          (cons new-start end))
+          (cons (max new-start (point-min)) end))
        nil)))

  ;;; Indent


Or maybe syntax-propertize itself should have a protection against going 
outside of bounds:

diff --git a/lisp/emacs-lisp/syntax.el b/lisp/emacs-lisp/syntax.el
index e35992298a6..61a9e79b59c 100644
--- a/lisp/emacs-lisp/syntax.el
+++ b/lisp/emacs-lisp/syntax.el
@@ -431,7 +431,7 @@ syntax-propertize
                       (if (or (null new)
                               (and (>= (car new) start) (<= (cdr new) 
end)))
                           nil
-                       (setq start (car new))
+                       (setq start (max (car new) (point-min)))
                         (setq end (cdr new))
                         ;; If there's been a change, we should go 
through the
                         ;; list again since this new position may

bug#67977: 30.0.50; tree-sitter: Emacs crashes when accessing treesit-nodes in a narrowed buffer

[Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors]

> diff --git a/lisp/treesit.el b/lisp/treesit.el
> index 264b95dc3a3..46ebadcf057 100644
> --- a/lisp/treesit.el
> +++ b/lisp/treesit.el
> @@ -1150,7 +1150,7 @@ treesit--pre-syntax-ppss
>      (if (and new-start (< new-start start))
>          (progn
>            (setq treesit--syntax-propertize-start nil)
> -          (cons new-start end))
> +          (cons (max new-start (point-min)) end))
>        nil)))
>
>  ;;; Indent

Sounds fine to me.  Often the caller of `syntax-propertize-function`
should widen beforehand, but in cases like `mmm-mode` indeed that's not
always desired.

> Or maybe syntax-propertize itself should have a protection against going
> outside of bounds:
>
> diff --git a/lisp/emacs-lisp/syntax.el b/lisp/emacs-lisp/syntax.el
> index e35992298a6..61a9e79b59c 100644
> --- a/lisp/emacs-lisp/syntax.el
> +++ b/lisp/emacs-lisp/syntax.el
> @@ -431,7 +431,7 @@ syntax-propertize
>                       (if (or (null new)
>                               (and (>= (car new) start) (<= (cdr new) end)))
>                           nil
> -                       (setq start (car new))
> +                       (setq start (max (car new) (point-min)))
>                         (setq end (cdr new))
>                         ;; If there's been a change, we should go through
>                           the
>                         ;; list again since this new position may

I think it's preferable for the expand-region function to perform this
test.  We could `cl-assert` that it's within BOB...EOB to help catch
such bugs (and clarify who's in charge of avoiding the problem), but
maybe we can mention it in the docstring.  But I personally consider
that anything that sends buffer positions is in charge to make sure that
they're within bounds, unless specifically documented otherwise, so
documenting it seems redundant.


        Stefan

bug#67977: 30.0.50; tree-sitter: Emacs crashes when accessing treesit-nodes in a narrowed buffer

[Dmitry Gutov]

On 02/01/2024 06:46, Stefan Monnier wrote:
>> diff --git a/lisp/treesit.el b/lisp/treesit.el
>> index 264b95dc3a3..46ebadcf057 100644
>> --- a/lisp/treesit.el
>> +++ b/lisp/treesit.el
>> @@ -1150,7 +1150,7 @@ treesit--pre-syntax-ppss
>>       (if (and new-start (< new-start start))
>>           (progn
>>             (setq treesit--syntax-propertize-start nil)
>> -          (cons new-start end))
>> +          (cons (max new-start (point-min)) end))
>>         nil)))
>>
>>   ;;; Indent
> Sounds fine to me.  Often the caller of `syntax-propertize-function`
> should widen beforehand, but in cases like `mmm-mode` indeed that's not
> always desired.

Thank you, I've pushed that fix.

>> Or maybe syntax-propertize itself should have a protection against going
>> outside of bounds:
>>
>> diff --git a/lisp/emacs-lisp/syntax.el b/lisp/emacs-lisp/syntax.el
>> index e35992298a6..61a9e79b59c 100644
>> --- a/lisp/emacs-lisp/syntax.el
>> +++ b/lisp/emacs-lisp/syntax.el
>> @@ -431,7 +431,7 @@ syntax-propertize
>>                        (if (or (null new)
>>                                (and (>= (car new) start) (<= (cdr new) end)))
>>                            nil
>> -                       (setq start (car new))
>> +                       (setq start (max (car new) (point-min)))
>>                          (setq end (cdr new))
>>                          ;; If there's been a change, we should go through
>>                            the
>>                          ;; list again since this new position may
> I think it's preferable for the expand-region function to perform this
> test.  We could `cl-assert` that it's within BOB...EOB to help catch
> such bugs (and clarify who's in charge of avoiding the problem), but
> maybe we can mention it in the docstring.  But I personally consider
> that anything that sends buffer positions is in charge to make sure that
> they're within bounds, unless specifically documented otherwise, so
> documenting it seems redundant.

Fair enough.

And I'll leave the question of adding cl-assert (or not) to you or 
others. Though might be that the signaled args-out-of-range will be a 
reliable indicator of this situation anyway.

bug#67977: 30.0.50; tree-sitter: Emacs crashes when accessing treesit-nodes in a narrowed buffer

[Yuan Fu]

> Though might be that the signaled args-out-of-range will be a reliable indicator of this situation anyway.

Right. The signal is pretty clear on what’s wrong.

Yuan