GNU bug report logs - #11966
24.1; cperl-mode with evil-mode causes hang on syntax-propertize

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: JC Petkovich <jcpetkovich <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.1; cperl-mode with evil-mode causes hang on syntax-propertize
Date: Tue, 17 Jul 2012 15:04:04 -0400

[Message part 1 (text/plain, inline)]

Emacs hangs on the creation of a newline with evil-ret when in a cperl
buffer with some POD documentation after the __END__. This doesn't
appear to be a bug in evil, but instead a bug in cperl or
syntax-propertize,
but I can't tell for sure.

I can reproduce it with emacs -Q and the following configuration:

;; evil-error-reproduce.el:
(defalias 'perl-mode 'cperl-mode)
(add-to-list 'load-path "<path to evil>")
(require 'evil)
(evil-mode 1)
;; end evil-error-reproduce.el


Once this config is evaluated, open a .pl file which has POD after __END__
like the following:

# hangs.pl:

print "hello world";

__END__

=head1 NAME

# end hangs.pl


and open a newline after the print statement with evil-ret (bound to RET
when in insert mode by default). I haven't been able to get further than
this in debugging this problem.


In GNU Emacs 24.1.1 (x86_64-pc-linux-gnu, GTK+ Version 2.24.10)
 of 2012-07-17 on jcp-lenovo
Windowing system distributor `The X.Org Foundation', version 11.0.11202000
Configured using:
 `configure '--prefix=/usr' '--build=x86_64-pc-linux-gnu'
 '--host=x86_64-pc-linux-gnu' '--mandir=/usr/share/man'
 '--infodir=/usr/share/info' '--datadir=/usr/share' '--sysconfdir=/etc'
 '--localstatedir=/var/lib' '--libdir=/usr/lib64'
 '--disable-dependency-tracking' '--program-suffix=-emacs-24'
 '--infodir=/usr/share/info/emacs-24'
 '--enable-locallisppath=/etc/emacs:/usr/share/emacs/site-lisp'
 '--with-crt-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.5.3/../../../../lib64'
 '--with-gameuser=games' '--without-compress-info'
 '--disable-maintainer-mode' '--without-hesiod' '--without-kerberos'
 '--without-kerberos5' '--with-gpm' '--with-dbus' '--with-gnutls'
 '--without-xml2' '--without-selinux' '--without-wide-int'
 '--with-sound' '--with-x' '--without-ns' '--without-gconf'
 '--without-gsettings' '--without-toolkit-scroll-bars' '--with-gif'
 '--with-jpeg' '--with-png' '--with-rsvg' '--with-tiff' '--with-xpm'
 '--without-imagemagick' '--with-xft' '--without-libotf'
 '--without-m17n-flt' '--with-x-toolkit=gtk'
 'GENTOO_PACKAGE=app-editors/emacs-24.1'
 'build_alias=x86_64-pc-linux-gnu' 'host_alias=x86_64-pc-linux-gnu'
 'CFLAGS=-O2 -march=native -pipe' 'LDFLAGS=-Wl,-O1 -Wl,--as-needed
 -Wl,-O1' 'CPPFLAGS=''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: en_US.UTF-8
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: CPerl

Minor modes in effect:
  evil-mode: t
  evil-local-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
r <tab> r e m <tab> r e <tab> <return> j j j j j j
j j j j j j j j j j j j j j j j j j j j j k o <return>
ESC j j j j V G d g g j j k k V j j j j d j j j j j
j j j j j j j j j j j j j j j j j j j j k k i <return>
<return> <backspace> <backspace> ESC u u j j j j j
j j j j j j j j j j j j j j j j j j j i <backspace>
<return> <return> ESC u u u u u u k k k g g j j j j
j j j j j j j j j j j j j j j j j j j j j j j j j j
j j k k k k g g V j j j j j k d j j j j j j j j j j
j j j j j j j j j j j j j j i <return> C-g ESC u j
j j j j V G d k k k k k i i <backspace> <return> C-g
ESC u C-x b C-g C-x C-b C-g C-x b s c C-g C-x C-f C-g
C-x b s c r <tab> <return> C-x 1 j j o <return> <return>
<return> ESC M-j M-j p k A C-x C-e ESC C-x C-b r e
m <tab> C-g C-x C-g C-x b <tab> <return> M-1 C-x 1
i <return> C-g ESC k d d M-x r e p o <tab> r <tab>
<return>

Recent messages:
Quit [2 times]
Undo!
Quit [4 times]
byte-code: End of buffer [2 times]
t
End of line
Quit
Making completion list...
Quit [2 times]
Making completion list...

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make-network-process dbusbind dynamic-setting font-render-setting
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[Message part 2 (text/html, inline)]

Message #8 received at 11966 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
To: JC Petkovich <jcpetkovich <at> gmail.com>
Cc: 11966 <at> debbugs.gnu.org
Subject: Re: bug#11966: 24.1;
	cperl-mode with evil-mode causes hang on syntax-propertize
Date: Wed, 18 Jul 2012 03:28:11 -0400

> Emacs hangs on the creation of a newline with evil-ret when in a cperl
> buffer with some POD documentation after the __END__. This doesn't
> appear to be a bug in evil, but instead a bug in cperl or
> syntax-propertize,
> but I can't tell for sure.

Before I dive further into this, can you first check whether the bug-fix
for bug#11739 (see patch below) happens to fix your problem as well?


        Stefan


=== modified file 'lisp/progmodes/cperl-mode.el'
--- lisp/progmodes/cperl-mode.el	2012-01-19 07:21:25 +0000
+++ lisp/progmodes/cperl-mode.el	2012-07-06 20:57:58 +0000
@@ -8951,14 +8951,15 @@
       (setq cperl-syntax-done-to (min cperl-syntax-done-to beg))))
 
 (defun cperl-update-syntaxification (from to)
-  (if (and cperl-use-syntax-table-text-property
-	   cperl-syntaxify-by-font-lock
-	   (or (null cperl-syntax-done-to)
-	       (< cperl-syntax-done-to to)))
-      (progn
-	(save-excursion
-	  (goto-char from)
-	  (cperl-fontify-syntaxically to)))))
+  (cond
+   ((not cperl-use-syntax-table-text-property) nil)
+   ((fboundp 'syntax-propertize) (syntax-propertize to))
+   ((and cperl-syntaxify-by-font-lock
+         (or (null cperl-syntax-done-to)
+             (< cperl-syntax-done-to to)))
+    (save-excursion
+      (goto-char from)
+      (cperl-fontify-syntaxically to)))))
 
 (defvar cperl-version
   (let ((v  "Revision: 6.2"))

Message #11 received at 11966 <at> debbugs.gnu.org (full text, mbox):

From: JC Petkovich <jcpetkovich <at> gmail.com>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 11966 <at> debbugs.gnu.org
Subject: Re: bug#11966: 24.1;
	cperl-mode with evil-mode causes hang on syntax-propertize
Date: Wed, 18 Jul 2012 03:41:54 -0400

[Message part 1 (text/plain, inline)]

I'm afraid the patch does not appear to do anything. Same symptoms.

Same procedure was used to reproduce, using a patched cperl-mode.el instead
(I made sure it was not loading the old elc, I moved it elsewhere).

Jean-Christophe Petkovich


On Wed, Jul 18, 2012 at 3:28 AM, Stefan Monnier <monnier <at> iro.umontreal.ca>wrote:

> > Emacs hangs on the creation of a newline with evil-ret when in a cperl
> > buffer with some POD documentation after the __END__. This doesn't
> > appear to be a bug in evil, but instead a bug in cperl or
> > syntax-propertize,
> > but I can't tell for sure.
>
> Before I dive further into this, can you first check whether the bug-fix
> for bug#11739 (see patch below) happens to fix your problem as well?
>
>
>         Stefan
>
>
> === modified file 'lisp/progmodes/cperl-mode.el'
> --- lisp/progmodes/cperl-mode.el        2012-01-19 07:21:25 +0000
> +++ lisp/progmodes/cperl-mode.el        2012-07-06 20:57:58 +0000
> @@ -8951,14 +8951,15 @@
>        (setq cperl-syntax-done-to (min cperl-syntax-done-to beg))))
>
>  (defun cperl-update-syntaxification (from to)
> -  (if (and cperl-use-syntax-table-text-property
> -          cperl-syntaxify-by-font-lock
> -          (or (null cperl-syntax-done-to)
> -              (< cperl-syntax-done-to to)))
> -      (progn
> -       (save-excursion
> -         (goto-char from)
> -         (cperl-fontify-syntaxically to)))))
> +  (cond
> +   ((not cperl-use-syntax-table-text-property) nil)
> +   ((fboundp 'syntax-propertize) (syntax-propertize to))
> +   ((and cperl-syntaxify-by-font-lock
> +         (or (null cperl-syntax-done-to)
> +             (< cperl-syntax-done-to to)))
> +    (save-excursion
> +      (goto-char from)
> +      (cperl-fontify-syntaxically to)))))
>
>  (defvar cperl-version
>    (let ((v  "Revision: 6.2"))
>
>

[Message part 2 (text/html, inline)]

Message #16 received at 11966-done <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
To: JC Petkovich <jcpetkovich <at> gmail.com>
Cc: 11966-done <at> debbugs.gnu.org, Ilya Zakharevich <ilyaz <at> cpan.org>
Subject: Re: bug#11966: 24.1;
	cperl-mode with evil-mode causes hang on syntax-propertize
Date: Wed, 18 Jul 2012 05:35:23 -0400

Version:24.2

> Emacs hangs on the creation of a newline with evil-ret when in a cperl
> buffer with some POD documentation after the __END__. This doesn't
> appear to be a bug in evil, but instead a bug in cperl or
> syntax-propertize,

Indeed, I could reproduce it without evil.  It seems to be a bug in
cperl-mode, tho maybe it can only be triggered via syntax-propertize.
In any case, I've installed the patch below into the emacs-24 branch,
and that should fix it.  Thanks you,


        Stefan


=== modified file 'lisp/ChangeLog'
--- lisp/ChangeLog	2012-07-09 13:54:50 +0000
+++ lisp/ChangeLog	2012-07-18 09:32:41 +0000
@@ -1,3 +1,8 @@
+2012-07-18  Stefan Monnier  <monnier <at> iro.umontreal.ca>
+
+	* progmodes/cperl-mode.el (cperl-unwind-to-safe): Don't inf-loop at end
+	of narrowed buffer (bug#11966).
+
 2012-07-09  Stefan Monnier  <monnier <at> iro.umontreal.ca>
 
 	* progmodes/sh-script.el (sh-syntax-propertize-function): Fix last

=== modified file 'lisp/progmodes/cperl-mode.el'
--- lisp/progmodes/cperl-mode.el	2012-06-21 16:49:21 +0000
+++ lisp/progmodes/cperl-mode.el	2012-07-18 09:31:14 +0000
@@ -3498,7 +3498,8 @@
     (if end
 	;; Do the same for end, going small steps
 	(save-excursion
-	  (while (and end (get-text-property end 'syntax-type))
+	  (while (and end (< end (point-max))
+		      (get-text-property end 'syntax-type))
 	    (setq pos end
 		  end (next-single-property-change end 'syntax-type nil (point-max)))
 	    (if end (progn (goto-char end)

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