GNU bug report logs - #25679
26.0.50; Emacs hangs for nested generics

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Package: emacs,cc-mode; Reported by: Philipp Stephani <p.stephani2@HIDDEN>; dated Fri, 10 Feb 2017 19:28:02 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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From: Philipp Stephani <p.stephani2@HIDDEN>
Date: Mon, 13 Feb 2017 09:30:14 +0000
Message-ID: <CAArVCkQ63qu0SOCyhFqf57HYJvcp6JUjXDyhoT7+3k0HWWSWBQ@HIDDEN>
Subject: Re: bug#25679: 26.0.50; Emacs hangs for nested generics
To: 25679 <at> debbugs.gnu.org
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--94eb2c03c8ceeb11260548661834
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Philipp Stephani <p.stephani2@HIDDEN> schrieb am Fr., 10. Feb. 2017 um
20:28 Uhr:

>
> Create a file /tmp/Foo.java with the following content:
>
> class Foo {
>     void func(A<B<C>>> a, A<B<C>>> b, A<B<C>>> c, A<B<C>>> d, A<B<C>>> e,
> A<B<C>>> f, A<B<C>>> g, A<B<C>>> h, A<B<C>>> i, A<B<C>>> j, A<B<C>>> k) {}
> }
>
> Then open that file:
>
> emacs -Q /tmp/Foo.java
>
> Emacs hangs.  C-g also doesn't work.  GDB shows the culprit is a
> recursive invocation of
>
> "c-forward-<>-arglist-recur" (0x29dd1f00)
> "c-forward-<>-arglist" (0x29dd2530)
> "c-forward-name" (0x29dd2d40)
> "c-forward-type" (0x29dd3750)
>
> The actual top of the stack is often GC or a regex match.
> Seems the parsing of generic arguments has some exponential behavior.
> This is a regression since 24.3, where editing such files has no
> noticeable delay.
>
>
>
I've tried lowering font-lock-maximum-decoration, it also doesn't appear to
help. Even at level 1 Emacs hangs.

In general I've got quite a few reports about hangs and slowness in newer
versions of CC-Mode. Please make sure it never hangs, if necessary by
removing the more complex parsing algorithms and adding hard timeouts to
font locking.

--94eb2c03c8ceeb11260548661834
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><br><br><div class=3D"gmail_quote"><div dir=3D"ltr">Philip=
p Stephani &lt;<a href=3D"mailto:p.stephani2@HIDDEN">p.stephani2@HIDDEN=
om</a>&gt; schrieb am Fr., 10. Feb. 2017 um 20:28=C2=A0Uhr:<br></div><block=
quote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc=
 solid;padding-left:1ex"><br class=3D"gmail_msg">
Create a file /tmp/Foo.java with the following content:<br class=3D"gmail_m=
sg">
<br class=3D"gmail_msg">
class Foo {<br class=3D"gmail_msg">
=C2=A0 =C2=A0 void func(A&lt;B&lt;C&gt;&gt;&gt; a, A&lt;B&lt;C&gt;&gt;&gt; =
b, A&lt;B&lt;C&gt;&gt;&gt; c, A&lt;B&lt;C&gt;&gt;&gt; d, A&lt;B&lt;C&gt;&gt=
;&gt; e, A&lt;B&lt;C&gt;&gt;&gt; f, A&lt;B&lt;C&gt;&gt;&gt; g, A&lt;B&lt;C&=
gt;&gt;&gt; h, A&lt;B&lt;C&gt;&gt;&gt; i, A&lt;B&lt;C&gt;&gt;&gt; j, A&lt;B=
&lt;C&gt;&gt;&gt; k) {}<br class=3D"gmail_msg">
}<br class=3D"gmail_msg">
<br class=3D"gmail_msg">
Then open that file:<br class=3D"gmail_msg">
<br class=3D"gmail_msg">
emacs -Q /tmp/Foo.java<br class=3D"gmail_msg">
<br class=3D"gmail_msg">
Emacs hangs.=C2=A0 C-g also doesn&#39;t work.=C2=A0 GDB shows the culprit i=
s a<br class=3D"gmail_msg">
recursive invocation of<br class=3D"gmail_msg">
<br class=3D"gmail_msg">
&quot;c-forward-&lt;&gt;-arglist-recur&quot; (0x29dd1f00)<br class=3D"gmail=
_msg">
&quot;c-forward-&lt;&gt;-arglist&quot; (0x29dd2530)<br class=3D"gmail_msg">
&quot;c-forward-name&quot; (0x29dd2d40)<br class=3D"gmail_msg">
&quot;c-forward-type&quot; (0x29dd3750)<br class=3D"gmail_msg">
<br class=3D"gmail_msg">
The actual top of the stack is often GC or a regex match.<br class=3D"gmail=
_msg">
Seems the parsing of generic arguments has some exponential behavior.<br cl=
ass=3D"gmail_msg">
This is a regression since 24.3, where editing such files has no<br class=
=3D"gmail_msg">
noticeable delay.<br class=3D"gmail_msg">
<br class=3D"gmail_msg"><br class=3D"gmail_msg"></blockquote><div><br></div=
><div>I&#39;ve tried lowering font-lock-maximum-decoration, it also doesn&#=
39;t appear to help. Even at level 1 Emacs hangs.</div><div><br></div><div>=
In general I&#39;ve got quite a few reports about hangs and slowness in new=
er versions of CC-Mode. Please make sure it never hangs, if necessary by re=
moving the more complex parsing algorithms and adding hard timeouts to font=
 locking.</div></div></div>

--94eb2c03c8ceeb11260548661834--




Information forwarded to bug-gnu-emacs@HIDDEN, bug-cc-mode@HIDDEN:
bug#25679; Package emacs,cc-mode. Full text available.

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From: Philipp Stephani <p.stephani2@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: 26.0.50; Emacs hangs for nested generics
Date: Fri, 10 Feb 2017 20:27:27 +0100
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Create a file /tmp/Foo.java with the following content:

class Foo {
    void func(A<B<C>>> a, A<B<C>>> b, A<B<C>>> c, A<B<C>>> d, A<B<C>>> e, A=
<B<C>>> f, A<B<C>>> g, A<B<C>>> h, A<B<C>>> i, A<B<C>>> j, A<B<C>>> k) {}
}

Then open that file:

emacs -Q /tmp/Foo.java

Emacs hangs.  C-g also doesn't work.  GDB shows the culprit is a
recursive invocation of

"c-forward-<>-arglist-recur" (0x29dd1f00)
"c-forward-<>-arglist" (0x29dd2530)
"c-forward-name" (0x29dd2d40)
"c-forward-type" (0x29dd3750)

The actual top of the stack is often GC or a regex match.
Seems the parsing of generic arguments has some exponential behavior.
This is a regression since 24.3, where editing such files has no
noticeable delay.



In GNU Emacs 26.0.50.3 (x86_64-unknown-linux-gnu, GTK+ Version 3.10.8)
 of 2017-02-10 built on localhost
Repository revision: abcba32c262e575b562ec0e481e55538536f969f
Windowing system distributor 'The X.Org Foundation', version 11.0.11501000
System Description:	Ubuntu 14.04 LTS

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.

Configured using:
 'configure --with-modules 'CFLAGS=3D-O0 -ggdb3' --enable-checking
 --enable-check-lisp-object-type'

Configured features:
XPM JPEG TIFF GIF PNG SOUND GSETTINGS NOTIFY GNUTLS FREETYPE XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 MODULES

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

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-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

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message subr-x puny seq byte-opt gv
bytecomp byte-compile cl-extra help-mode cconv cl-loaddefs pcase cl-lib
dired dired-loaddefs format-spec rfc822 mml easymenu mml-sec
password-cache epa derived epg epg-config gnus-util rmail rmail-loaddefs
mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils
mailheader sendmail rfc2047 rfc2045 ietf-drums mm-util mail-prsvr
mail-utils time-date mule-util tooltip eldoc electric uniquify
ediff-hook vc-hooks lisp-float-type mwheel term/x-win x-win
term/common-win x-dnd tool-bar dnd fontset image regexp-opt fringe
tabulated-list replace newcomment text-mode elisp-mode lisp-mode
prog-mode register page menu-bar rfn-eshadow isearch timer select
scroll-bar mouse jit-lock font-lock syntax facemenu font-core
term/tty-colors frame cl-generic 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 charscript case-table epa-hook jka-cmpr-hook help
simple abbrev obarray minibuffer cl-preloaded nadvice loaddefs button
faces cus-face macroexp files text-properties overlay sha1 md5 base64
format env code-pages mule custom widget hashtable-print-readable
backquote inotify dynamic-setting system-font-setting
font-render-setting move-toolbar gtk x-toolkit x multi-tty
make-network-process emacs)

Memory information:
((conses 16 97870 8481)
 (symbols 48 20263 1)
 (miscs 40 331 131)
 (strings 32 18056 4481)
 (string-bytes 1 593648)
 (vectors 16 14075)
 (vector-slots 8 472899 6583)
 (floats 8 182 52)
 (intervals 56 218 0)
 (buffers 976 12)
 (heap 1024 32557 1028))

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Acknowledgement sent to Philipp Stephani <p.stephani2@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#25679; Package emacs. Full text available.
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