* bug#7722: 24.0.50; Finding this C++ header file drops emacs into a infinite loop
@ 2010-12-24 8:28 Tassilo Horn
2011-01-22 20:37 ` Chong Yidong
0 siblings, 1 reply; 9+ messages in thread
From: Tassilo Horn @ 2010-12-24 8:28 UTC (permalink / raw)
To: 7722
Orininally reported by Caligo <iteronvexor@gmail.com> in
gmane.emacs.help
(<AANLkTikee8kNAxp6+viq6KSVPzqr3-0w1WCw0i+1iY_b@mail.gmail.com>). He
uses GNU Emacs 23.2.1 (x86_64-pc-linux-gnu, GTK+ Version 2.20.1), but
the bug in still in the current bzr trunk.
1. emacs -Q bug.hpp
2. emacs loops infinitely using 100% CPU resources
The offending file is that (according to the original reporter, the
spaces and empty lines are needed):
--8<---------------cut here---------------start------------->8---
class ConversionConsole : public QWidget{
private:
typedef boost::array<InputLine, 22> InputLines;
typedef cons<XYZ, cons<xyY, cons<Lab, cons<LCHab, cons<Luv, cons<LCHuv,
cons<AdobeRGB, cons<AppleRGB, cons<BestRGB, cons<BetaRGB,
cons<BruceRGB, cons<CIERGB, cons<ColorMatchRGB, cons<DonRGB4,
cons<ECIRGB, cons<EktaSpacePS5, cons<NTSCRGB, cons<PAL_SECAMRGB,
cons<ProPhotoRGB, cons<SMPTE_CRGB, cons<sRGB, cons<WideGamutRGB
> > > > > > > > > > > > > > > > > > > > > > ColorSpaces;
};
--8<---------------cut here---------------end--------------->8---
In GNU Emacs 24.0.50.1 (x86_64-pc-linux-gnu)
of 2010-12-21 on thinkpad
Windowing system distributor `The X.Org Foundation', version 11.0.10902902
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' '--program-suffix=-emacs-24' '--infodir=/usr/share/info/emacs-24' '--with-crt-dir=/usr/lib64' '--without-compress-info' '--with-sound' '--with-x' '--without-gconf' '--with-xml2' '--without-toolkit-scroll-bars' '--with-gif' '--with-jpeg' '--with-png' '--with-rsvg' '--with-tiff' '--with-xpm' '--with-imagemagick' '--with-xft' '--with-libotf' '--with-m17n-flt' '--with-x-toolkit=no' '--without-hesiod' '--without-kerberos' '--without-kerberos5' '--with-gpm' '--with-dbus' '--with-gnutls' '--without-selinux' 'build_alias=x86_64-pc-linux-gnu' 'host_alia
s=x86_64-pc-linux-gnu' 'CFLAGS=-march=native -O2 -pipe' 'LDFLAGS=-Wl,-O1 -Wl,--as-needed' 'CPPFLAGS=''
Important settings:
value of $LC_ALL: nil
value of $LC_COLLATE: nil
value of $LC_CTYPE: nil
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: Message
Minor modes in effect:
gnus-message-citation-mode: t
diff-auto-refine-mode: t
mml-mode: t
global-auto-complete-mode: t
auto-complete-mode: t
yas/minor-mode: t
recentf-mode: t
window-number-meta-mode: t
window-number-mode: t
global-subword-mode: t
subword-mode: t
savehist-mode: t
show-paren-mode: t
tooltip-mode: t
mouse-wheel-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
column-number-mode: t
line-number-mode: t
transient-mark-mode: t
Recent input:
u d i n g SPC t h e SPC b a d SPC <M-backspace> h p
p SPC f i l e SPC u s i n g M-q SPC M - x SPC r e p
<return> - e m M-/ SPC <backspace> z <backspace> ?
<return> <return> b <tab> C-c C-c C-g C-g SPC SPC SPC
SPC SPC SPC F <down> <down> <up> C-k <return> <up>
<return> N e x t SPC t i b e <backspace> <backspace>
m e , SPC s i m p l y SPC c o p y SPC t h e SPC c o
n t e n t s SPC o f SPC t h e SPC b u g SPC r e p o
r t SPC b u f f e r SPC i n t o SPC y o u r SPC e m
a c <M-backspace> u s u a l SPC e m a i <backspace>
i l SPC c l e i <backspace> <backspace> i o <backspace>
e n t SPC a n d SPC s e n d SPC f r o m SPC t h a t
. <down> <down> <down> C-a C-k C-k C-k C-k C-k C-k
C-k C-k C-k C-k C-k C-k C-k C-k C-k C-k C-k C-k C-k
C-k C-k C-k C-k C-k C-k C-k C-k C-k C-k C-k C-k C-k
C-k C-k C-k C-k C-k C-k C-k C-k C-k C-k C-k C-k C-k
C-k C-k C-k C-k C-k C-k C-k C-k C-k C-k C-k C-k C-k
C-k C-k C-k C-k C-k C-k C-k C-k C-k C-k C-k C-k C-k
C-k C-k C-k C-k C-k C-k <return> I ' l l SPC d o .
<return> <return> b <tab> M-x r e p o <tab> r t <tab>
<return>
Recent messages:
Sending...
Sending news via Gmane using nntp...
Wrote /home/horn/.gnus.d/News/archive/sent-postings/902
Sending...done
Quit [2 times]
Mark set [2 times]
kill-line: End of buffer [3 times]
[yas] snippet expanded.
[yas] snippet 3 exited.
Making completion list...
Load-path shadows:
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Features:
(shadow emacsbug canlock sha1 hex-util bbdb-gui hippie-exp skeleton
mailalias smtpmail newcomment qp mule-util xgit-dvc xgit xgit-annotate
dvc-annotate xgit-log tla smerge-mode dvc-state dvc-config dvc-diff
dvc-fileinfo diff tla-gnus dvc-gnus dvc-cmenu dvc-about dvc-version
dvc-revlist bzr-core tla-core tla-autoconf tla-defs dvc-log vc
vc-dispatcher dvc-unified dvc-tips ediff-merg ediff-diff ediff-wind
ediff-help ediff-util ediff-mult ediff-init ediff xdarcs-core xgit-core
xhg-core xmtn-minimal sort smiley ansi-color gnus-cite gnus-async
gnus-bcklg gnus-ml nndraft nnmh utf-7 rot13 nnimap parse-time utf7 nnml
bbdb-gnus bbdb-snarf nnnil gnus-agent gnus-srvr gnus-score score-mode
nnvirtual gnus-cache gnus-demon nntp proto-stream starttls spam
spam-stat bbdb-com gnus-uu yenc gnus-msg gnus-gravatar mail-extr
gnus-art mm-uu mml2015 mm-view smime password-cache dig gravatar
gnus-topic gnus-registry nnir gnus-sum macroexp nnoo gnus-group
gnus-undo nnmail mail-source th-private gnus-start gnus-spec gnus-int
gnus-range gnus-win eldoc go-mode-load flymake greqlscript-mode
greql-mode tg-mode generic th-latex paredit dvc-autoloads dvc-core
dvc-lisp dvc-buffers dvc-ui dvc-register dvc-utils dvc-emacs ewoc
dvc-defs dvc-site magit diff-mode log-edit pcvs-util add-log
magit-key-mode epa-file epa epg epg-config wtf cus-edit cus-start
cus-load rdictcc org-location-google-maps google-maps google-maps-static
google-maps-geocode google-maps-base json org-google-weather format-spec
google-weather xml url-cache org-beamer solar cal-dst holidays
hol-loaddefs appt diary-lib diary-loaddefs vc-git hl-line org-w3m
org-irc org-jsinfo org-infojs org-html org-exp ob-exp org-exp-blocks
org-info org-gnus org-docview org-bibtex org-bbdb org-protocol
org-attach org-id org-agenda org ob-emacs-lisp ob-tangle ob-ref ob-lob
ob-table org-footnote org-src ob-comint ob-keys ob ob-eval org-complete
pcomplete org-list org-faces org-compat org-entities org-macs time-date
org-install cal-menu calendar cal-loaddefs dired-x dired-aux
highlight-symbol hi-lock th-boxquote boxquote rect ecomplete message
idna sendmail rfc822 mml mml-sec mm-decode mm-bodies mm-encode
mailabbrev gmm-utils mailheader info server auto-complete-config
auto-complete popup yasnippet dropdown-list help-mode view disp-table
noutline outline browse-kill-ring derived recentf tree-widget
sr-speedbar speedbar sb-image ezimage dframe assoc anything-config
warnings compile comint ring browse-url semantic/util-modes
semantic/util semantic semantic/tag semantic/lex semantic/fw eieio
byte-opt bytecomp byte-compile mode-local cedet imenu bookmark pp
easymenu rx ffap thingatpt anything window-number easy-mmode uniquify
subword saveplace savehist paren lusty-explorer dired cl edmacro kmacro
advice help-fns advice-preload th-common mm-url gnus gnus-ems nnheader
mail-utils wid-edit url-http tls url url-proxy url-privacy url-expand
url-methods url-history mailcap url-auth mail-parse rfc2231 rfc2047
rfc2045 ietf-drums url-cookie url-util url-parse auth-source netrc
gnus-util url-gw url-vars mm-util mail-prsvr windmove gnus-load
site-gentoo preview-latex bbdb-autoloads bbdb regexp-opt timezone
tex-site auto-loads tooltip ediff-hook vc-hooks lisp-float-type mwheel
x-win x-dnd tool-bar dnd fontset image fringe lisp-mode register page
menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock font-lock
syntax facemenu font-core frame cham georgian utf-8-lang misc-lang
vietnamese tibetan thai tai-viet lao korean japanese hebrew greek
romanian slovak czech european ethiopic indian cyrillic chinese
case-table epa-hook jka-cmpr-hook help simple abbrev loaddefs button
minibuffer faces cus-face files text-properties overlay md5 base64
format env code-pages mule custom widget hashtable-print-readable
backquote make-network-process dbusbind dynamic-setting
font-render-setting x multi-tty emacs)
^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#7722: 24.0.50; Finding this C++ header file drops emacs into a infinite loop
2010-12-24 8:28 bug#7722: 24.0.50; Finding this C++ header file drops emacs into a infinite loop Tassilo Horn
@ 2011-01-22 20:37 ` Chong Yidong
2011-01-27 0:55 ` Chong Yidong
2011-02-04 22:22 ` Alan Mackenzie
0 siblings, 2 replies; 9+ messages in thread
From: Chong Yidong @ 2011-01-22 20:37 UTC (permalink / raw)
To: Alan Mackenzie; +Cc: 7722, Tassilo Horn
[-- Attachment #1: Type: text/plain, Size: 1732 bytes --]
Tassilo Horn <tassilo@member.fsf.org> writes:
> Orininally reported by Caligo <iteronvexor@gmail.com>
>
> He uses GNU Emacs 23.2.1 (x86_64-pc-linux-gnu, GTK+ Version 2.20.1),
> but the bug in still in the current bzr trunk.
>
> 1. emacs -Q bug.hpp
> 2. emacs loops infinitely using 100% CPU resources
>
> The offending file is that (according to the original reporter, the
> spaces and empty lines are needed):
I can reproduce this (file attached for convenience). Alan, could you
take a look? Looks like a loop in c-forward-<>-arglist-recur:
Lisp Backtrace:
"c-forward-<>-arglist-recur" (0xffff4528)
"c-forward-<>-arglist-recur" (0xffff4708)
"c-forward-<>-arglist-recur" (0xffff48e8)
"c-forward-<>-arglist-recur" (0xffff4ac8)
"c-forward-<>-arglist-recur" (0xffff4ca8)
"c-forward-<>-arglist-recur" (0xffff4e88)
"c-forward-<>-arglist-recur" (0xffff5068)
"c-forward-<>-arglist-recur" (0xffff5248)
"c-forward-<>-arglist-recur" (0xffff5428)
"c-forward-<>-arglist-recur" (0xffff5608)
"c-forward-<>-arglist-recur" (0xffff57e8)
"c-forward-<>-arglist-recur" (0xffff59c8)
"c-forward-<>-arglist-recur" (0xffff5ba8)
"c-forward-<>-arglist-recur" (0xffff5d88)
"byte-code" (0xffff5e60)
"c-forward-<>-arglist" (0xffff6208)
---Type <return> to continue, or q <return> to quit---
"c-forward-name" (0xffff63e8)
"c-forward-type" (0xffff65c8)
"c-forward-decl-or-cast-1" (0xffff67f8)
0xee3c20 PVEC_COMPILED
"c-find-decl-spots" (0xffff6bb8)
"c-font-lock-declarations" (0xffff6dd8)
"font-lock-fontify-keywords-region" (0xffff6fc8)
"font-lock-default-fontify-region" (0xffff7198)
"font-lock-fontify-region" (0xffff7440)
"run-hook-with-args" (0xffff7438)
"byte-code" (0xffff7520)
"jit-lock-fontify-now" (0xffff7938)
"jit-lock-function" (0xffff7cc8)
[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: bug.hpp --]
[-- Type: text/x-c++hdr, Size: 590 bytes --]
class ConversionConsole : public QWidget{
private:
typedef boost::array<InputLine, 22> InputLines;
typedef cons<XYZ, cons<xyY, cons<Lab, cons<LCHab, cons<Luv, cons<LCHuv,
cons<AdobeRGB, cons<AppleRGB, cons<BestRGB, cons<BetaRGB,
cons<BruceRGB, cons<CIERGB, cons<ColorMatchRGB, cons<DonRGB4,
cons<ECIRGB, cons<EktaSpacePS5, cons<NTSCRGB, cons<PAL_SECAMRGB,
cons<ProPhotoRGB, cons<SMPTE_CRGB, cons<sRGB, cons<WideGamutRGB
> > > > > > > > > > > > > > > > > > > > > > ColorSpaces;
};
^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#7722: 24.0.50; Finding this C++ header file drops emacs into a infinite loop
2011-01-22 20:37 ` Chong Yidong
@ 2011-01-27 0:55 ` Chong Yidong
2011-01-30 21:23 ` Daniel Colascione
2011-02-04 22:22 ` Alan Mackenzie
1 sibling, 1 reply; 9+ messages in thread
From: Chong Yidong @ 2011-01-27 0:55 UTC (permalink / raw)
To: Alan Mackenzie; +Cc: 7722, Tassilo Horn
Chong Yidong <cyd@stupidchicken.com> writes:
>> 1. emacs -Q bug.hpp
>> 2. emacs loops infinitely using 100% CPU resources
>>
>> The offending file is that (according to the original reporter, the
>> spaces and empty lines are needed):
>
> I can reproduce this (file attached for convenience). Alan, could you
> take a look? Looks like a loop in c-forward-<>-arglist-recur:
In the meantime, I have added the following hack/workaround to the
emacs-23 branch, which seems to break the loop. Let me know if you find
a fix that's safer (since we are well into the 23.3 pretest).
*** lisp/progmodes/cc-engine.el 2011-01-02 23:50:46 +0000
--- lisp/progmodes/cc-engine.el 2011-01-27 00:49:22 +0000
***************
*** 4393,4398 ****
--- 4393,4400 ----
(goto-char safe-pos)
t)))
+ (defvar c-forward-<>-arglist-recur-depth)
+
(defun c-forward-<>-arglist (all-types)
;; The point is assumed to be at a "<". Try to treat it as the open
;; paren of an angle bracket arglist and move forward to the
***************
*** 4418,4424 ****
;; If `c-record-type-identifiers' is set then activate
;; recording of any found types that constitute an argument in
;; the arglist.
! (c-record-found-types (if c-record-type-identifiers t)))
(if (catch 'angle-bracket-arglist-escape
(setq c-record-found-types
(c-forward-<>-arglist-recur all-types)))
--- 4420,4427 ----
;; If `c-record-type-identifiers' is set then activate
;; recording of any found types that constitute an argument in
;; the arglist.
! (c-record-found-types (if c-record-type-identifiers t))
! (c-forward-<>-arglist-recur--depth 0))
(if (catch 'angle-bracket-arglist-escape
(setq c-record-found-types
(c-forward-<>-arglist-recur all-types)))
***************
*** 4434,4439 ****
--- 4437,4450 ----
nil)))
(defun c-forward-<>-arglist-recur (all-types)
+
+ ;; Temporary workaround for Bug#7722.
+ (when (boundp 'c-forward-<>-arglist-recur--depth)
+ (if (> c-forward-<>-arglist-recur--depth 100)
+ (error "Max recursion depth reached in <> arglist")
+ (setq c-forward-<>-arglist-recur--depth
+ (1+ c-forward-<>-arglist-recur--depth))))
+
;; Recursive part of `c-forward-<>-arglist'.
;;
;; This function might do hidden buffer changes.
^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#7722: 24.0.50; Finding this C++ header file drops emacs into a infinite loop
2011-01-27 0:55 ` Chong Yidong
@ 2011-01-30 21:23 ` Daniel Colascione
0 siblings, 0 replies; 9+ messages in thread
From: Daniel Colascione @ 2011-01-30 21:23 UTC (permalink / raw)
To: Chong Yidong; +Cc: 7722, Tassilo Horn
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
On 1/26/11 4:55 PM, Chong Yidong wrote:
> Chong Yidong <cyd@stupidchicken.com> writes:
>
>>> 1. emacs -Q bug.hpp
>>> 2. emacs loops infinitely using 100% CPU resources
>>>
>>> The offending file is that (according to the original reporter, the
>>> spaces and empty lines are needed):
>>
>> I can reproduce this (file attached for convenience). Alan, could you
>> take a look? Looks like a loop in c-forward-<>-arglist-recur:
>
> In the meantime, I have added the following hack/workaround to the
> emacs-23 branch, which seems to break the loop. Let me know if you find
> a fix that's safer (since we are well into the 23.3 pretest).
Incidentally, I can't reproduce the problem with the trunk cc-mode.
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^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#7722: 24.0.50; Finding this C++ header file drops emacs into a infinite loop
2011-01-22 20:37 ` Chong Yidong
2011-01-27 0:55 ` Chong Yidong
@ 2011-02-04 22:22 ` Alan Mackenzie
2011-02-06 19:20 ` Tassilo Horn
2011-02-12 1:25 ` Chong Yidong
1 sibling, 2 replies; 9+ messages in thread
From: Alan Mackenzie @ 2011-02-04 22:22 UTC (permalink / raw)
To: Chong Yidong; +Cc: 7722, Tassilo Horn
Hi there, Yidong, Tassilo,
On Sat, Jan 22, 2011 at 03:37:24PM -0500, Chong Yidong wrote:
> Tassilo Horn <tassilo@member.fsf.org> writes:
> > Originally reported by Caligo <iteronvexor@gmail.com>
> > He uses GNU Emacs 23.2.1 (x86_64-pc-linux-gnu, GTK+ Version 2.20.1),
> > but the bug in still in the current bzr trunk.
> > 1. emacs -Q bug.hpp
> > 2. emacs loops infinitely using 100% CPU resources
> > The offending file is that (according to the original reporter, the
> > spaces and empty lines are needed):
> I can reproduce this (file attached for convenience). Alan, could you
> take a look? Looks like a loop in c-forward-<>-arglist-recur:
It was indeed such a loop. It was caused by a 500n jit-lock boundary
falling in the middle of a template construct, hence the "necessity" of
all the whitespace to reproduce the failure.
Here's a putative patch for the problem. I've refactored the offending
function by replacing obscenely nested `if'-forms with a simple `cond'.
I've also removed some narrowing (to the 500n limit) which should help
jit-lock, hopefully without hurting too much elsewhere.
Tassilo, would you try out the patch, please, and let me know how it
goes. Thanks!
=== modified file 'lisp/progmodes/cc-engine.el'
*** lisp/progmodes/cc-engine.el 2011-01-31 23:54:50 +0000
--- lisp/progmodes/cc-engine.el 2011-02-04 22:12:46 +0000
***************
*** 5455,5463 ****
(goto-char start)
nil))
! (forward-char)
(unless (looking-at c-<-op-cont-regexp)
(while (and
(progn
(c-forward-syntactic-ws)
--- 5455,5465 ----
(goto-char start)
nil))
! (forward-char) ; Forward over the opening '<'.
(unless (looking-at c-<-op-cont-regexp)
+ ;; go forward one non-alphanumeric character (group) per iteration of
+ ;; this loop.
(while (and
(progn
(c-forward-syntactic-ws)
***************
*** 5486,5492 ****
(c-forward-type)
(c-forward-syntactic-ws))))))
! (setq pos (point))
;; Note: These regexps exploit the match order in \| so
;; that "<>" is matched by "<" rather than "[^>:-]>".
--- 5488,5494 ----
(c-forward-type)
(c-forward-syntactic-ws))))))
! (setq pos (point)) ; e.g. first token inside the '<'
;; Note: These regexps exploit the match order in \| so
;; that "<>" is matched by "<" rather than "[^>:-]>".
***************
*** 5522,5559 ****
;; Either an operator starting with '<' or a nested arglist.
(setq pos (point))
(let (id-start id-end subres keyword-match)
! (if (if (looking-at c-<-op-cont-regexp)
! (setq tmp (match-end 0))
! (setq tmp pos)
! (backward-char)
! (not
! (and
!
! (save-excursion
! ;; There's always an identifier before an angle
! ;; bracket arglist, or a keyword in
! ;; `c-<>-type-kwds' or `c-<>-arglist-kwds'.
! (c-backward-syntactic-ws)
! (setq id-end (point))
! (c-simple-skip-symbol-backward)
! (when (or (setq keyword-match
! (looking-at c-opt-<>-sexp-key))
! (not (looking-at c-keywords-regexp)))
! (setq id-start (point))))
!
! (setq subres
! (let ((c-promote-possible-types t)
! (c-record-found-types t))
! (c-forward-<>-arglist-recur
! (and keyword-match
! (c-keyword-member
! (c-keyword-sym (match-string 1))
! 'c-<>-type-kwds)))))
! )))
!
! ;; It was not an angle bracket arglist.
! (goto-char tmp)
!
;; It was an angle bracket arglist.
(setq c-record-found-types subres)
--- 5524,5558 ----
;; Either an operator starting with '<' or a nested arglist.
(setq pos (point))
(let (id-start id-end subres keyword-match)
! (cond
! ;; The '<' begins a multi-char operator.
! ((looking-at c-<-op-cont-regexp)
! (setq tmp (match-end 0))
! (goto-char (match-end 0)))
! ;; We're at a nested <.....>
! ((progn
! (setq tmp pos)
! (backward-char) ; to the '<'
! (and
! (save-excursion
! ;; There's always an identifier before an angle
! ;; bracket arglist, or a keyword in `c-<>-type-kwds'
! ;; or `c-<>-arglist-kwds'.
! (c-backward-syntactic-ws)
! (setq id-end (point))
! (c-simple-skip-symbol-backward)
! (when (or (setq keyword-match
! (looking-at c-opt-<>-sexp-key))
! (not (looking-at c-keywords-regexp)))
! (setq id-start (point))))
! (setq subres
! (let ((c-promote-possible-types t)
! (c-record-found-types t))
! (c-forward-<>-arglist-recur
! (and keyword-match
! (c-keyword-member
! (c-keyword-sym (match-string 1))
! 'c-<>-type-kwds)))))))
;; It was an angle bracket arglist.
(setq c-record-found-types subres)
***************
*** 5567,5574 ****
(c-forward-syntactic-ws)
(looking-at c-opt-identifier-concat-key)))
(c-record-ref-id (cons id-start id-end))
! (c-record-type-id (cons id-start id-end))))))
! t)
((and (not c-restricted-<>-arglists)
(or (and (eq (char-before) ?&)
--- 5566,5578 ----
(c-forward-syntactic-ws)
(looking-at c-opt-identifier-concat-key)))
(c-record-ref-id (cons id-start id-end))
! (c-record-type-id (cons id-start id-end)))))
!
! ;; At a "less than" operator.
! (t
! (forward-char)
! )))
! t) ; carry on looping.
((and (not c-restricted-<>-arglists)
(or (and (eq (char-before) ?&)
=== modified file 'lisp/progmodes/cc-fonts.el'
*** lisp/progmodes/cc-fonts.el 2011-01-25 04:08:28 +0000
--- lisp/progmodes/cc-fonts.el 2011-02-04 22:10:01 +0000
***************
*** 1082,1088 ****
(boundp 'parse-sexp-lookup-properties))))
;; Below we fontify a whole declaration even when it crosses the limit,
! ;; to avoid gaps when lazy-lock fontifies the file a screenful at a
;; time. That is however annoying during editing, e.g. the following is
;; a common situation while the first line is being written:
;;
--- 1082,1088 ----
(boundp 'parse-sexp-lookup-properties))))
;; Below we fontify a whole declaration even when it crosses the limit,
! ;; to avoid gaps when jit/lazy-lock fontifies the file a block at a
;; time. That is however annoying during editing, e.g. the following is
;; a common situation while the first line is being written:
;;
***************
*** 1094,1102 ****
;; "some_other_variable" as an identifier, and the latter will not
;; correct itself until the second line is changed. To avoid that we
;; narrow to the limit if the region to fontify is a single line.
! (narrow-to-region
! (point-min)
! (if (<= limit (c-point 'bonl))
(save-excursion
;; Narrow after any operator chars following the limit though,
;; since those characters can be useful in recognizing a
--- 1094,1102 ----
;; "some_other_variable" as an identifier, and the latter will not
;; correct itself until the second line is changed. To avoid that we
;; narrow to the limit if the region to fontify is a single line.
! (if (<= limit (c-point 'bonl))
! (narrow-to-region
! (point-min)
(save-excursion
;; Narrow after any operator chars following the limit though,
;; since those characters can be useful in recognizing a
***************
*** 1104,1111 ****
;; after the header).
(goto-char limit)
(skip-chars-forward c-nonsymbol-chars)
! (point))
! limit))
(c-find-decl-spots
limit
--- 1104,1110 ----
;; after the header).
(goto-char limit)
(skip-chars-forward c-nonsymbol-chars)
! (point))))
(c-find-decl-spots
limit
--
Alan Mackenzie (Nuremberg, Germany).
^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#7722: 24.0.50; Finding this C++ header file drops emacs into a infinite loop
2011-02-04 22:22 ` Alan Mackenzie
@ 2011-02-06 19:20 ` Tassilo Horn
2011-02-12 1:25 ` Chong Yidong
1 sibling, 0 replies; 9+ messages in thread
From: Tassilo Horn @ 2011-02-06 19:20 UTC (permalink / raw)
To: Alan Mackenzie; +Cc: 7722, Chong Yidong
Alan Mackenzie <acm@muc.de> writes:
Hi Alan,
> Here's a putative patch for the problem. I've refactored the
> offending function by replacing obscenely nested `if'-forms with a
> simple `cond'. I've also removed some narrowing (to the 500n limit)
> which should help jit-lock, hopefully without hurting too much
> elsewhere.
>
> Tassilo, would you try out the patch, please, and let me know how it
> goes. Thanks!
Seems to work fine. I had no problems visiting that bad header file.
Bye,
Tassilo
^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#7722: 24.0.50; Finding this C++ header file drops emacs into a infinite loop
2011-02-04 22:22 ` Alan Mackenzie
2011-02-06 19:20 ` Tassilo Horn
@ 2011-02-12 1:25 ` Chong Yidong
2011-02-13 12:20 ` Alan Mackenzie
1 sibling, 1 reply; 9+ messages in thread
From: Chong Yidong @ 2011-02-12 1:25 UTC (permalink / raw)
To: Alan Mackenzie; +Cc: 7722, Tassilo Horn
Alan Mackenzie <acm@muc.de> writes:
> It was indeed such a loop. It was caused by a 500n jit-lock boundary
> falling in the middle of a template construct, hence the "necessity" of
> all the whitespace to reproduce the failure.
>
> Here's a putative patch for the problem. I've refactored the offending
> function by replacing obscenely nested `if'-forms with a simple `cond'.
> I've also removed some narrowing (to the 500n limit) which should help
> jit-lock, hopefully without hurting too much elsewhere.
>
> Tassilo, would you try out the patch, please, and let me know how it
> goes. Thanks!
Thanks. This patch doesn't apply cleanly to the emacs-23 branch. Do
you think we could apply it to the trunk, and just use the workaround in
the branch (some of these logic changes don't look obvious to me)?
^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#7722: 24.0.50; Finding this C++ header file drops emacs into a infinite loop
2011-02-12 1:25 ` Chong Yidong
@ 2011-02-13 12:20 ` Alan Mackenzie
2011-02-13 20:41 ` Chong Yidong
0 siblings, 1 reply; 9+ messages in thread
From: Alan Mackenzie @ 2011-02-13 12:20 UTC (permalink / raw)
To: Chong Yidong; +Cc: 7722, Tassilo Horn
Hi, Yidong!
On Fri, Feb 11, 2011 at 08:25:06PM -0500, Chong Yidong wrote:
> Alan Mackenzie <acm@muc.de> writes:
> > It was indeed such a loop. It was caused by a 500n jit-lock boundary
> > falling in the middle of a template construct, hence the "necessity" of
> > all the whitespace to reproduce the failure.
> > Here's a putative patch for the problem. I've refactored the offending
> > function by replacing obscenely nested `if'-forms with a simple `cond'.
> > I've also removed some narrowing (to the 500n limit) which should help
> > jit-lock, hopefully without hurting too much elsewhere.
> > Tassilo, would you try out the patch, please, and let me know how it
> > goes. Thanks!
> Thanks. This patch doesn't apply cleanly to the emacs-23 branch.
That surprises me. Would you like me to rework the patch so that it
does?
> Do you think we could apply it to the trunk, and just use the
> workaround in the branch ....
To be honest, I haven't really looked at the workaround. I suppose it
would be OK. However, the patched version passed all the CC Mode
regression tests (which are about half indentation, half font-locking),
so I'm fairly confident about it.
> .... (some of these logic changes don't look obvious to me)?
One of the fixes was removing a `narrow-to-region' around the region
being fontified. In a jit-lock 500-byte chunk, this had the effect of
cutting necessary context off the end.
The other change was basically to refactor, in which the infinite looping
disappeared in the wash. Although I could get edebug going on this loop,
the source was just too complicated to be worthwhile trying to understand
in detail. (Believe me, I tried. :-)
Incidentally, I'm not getting mail from emacs-devel or bug-gnu-emacs at
the moment, and I've not got enough energy to do anything about it. Do
you know anything specific which might be doing this to me?
--
Alan Mackenzie (Nuremberg, Germany).
^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#7722: 24.0.50; Finding this C++ header file drops emacs into a infinite loop
2011-02-13 12:20 ` Alan Mackenzie
@ 2011-02-13 20:41 ` Chong Yidong
0 siblings, 0 replies; 9+ messages in thread
From: Chong Yidong @ 2011-02-13 20:41 UTC (permalink / raw)
To: Alan Mackenzie; +Cc: 7722, Tassilo Horn
Alan Mackenzie <acm@muc.de> writes:
>> Thanks. This patch doesn't apply cleanly to the emacs-23 branch.
>
> That surprises me. Would you like me to rework the patch so that it
> does?
I took a stab at it, but I'm not familiar enough with the code to do the
job. Here's an example of a mismatch. In your patch, you have:
***************
*** 5486,5492 ****
(c-forward-type)
(c-forward-syntactic-ws))))))
! (setq pos (point))
;; Note: These regexps exploit the match order in \| so
;; that "<>" is matched by "<" rather than "[^>:-]>".
--- 5488,5494 ----
(c-forward-type)
(c-forward-syntactic-ws))))))
! (setq pos (point)) ; e.g. first token inside the '<'
;; Note: These regexps exploit the match order in \| so
;; that "<>" is matched by "<" rather than "[^>:-]>".
but in the branch, the relevant part of the code looks like this:
;; Must check for '>' at the very start separately,
;; since the regexp below has to avoid ">>" without
;; using \\=.
(forward-char)
t)
;; Note: These regexps exploit the match order in \| so
;; that "<>" is matched by "<" rather than "[^>:-]>".
This code was altered during Nathaniel Flath's changes for Java 5
support, back in July, which was (rightly) not committed to the branch:
revno: 100951
committer: Alan Mackenzie <acm@muc.de>
branch nick: trunk
timestamp: Sat 2010-07-31 20:01:08 +0000
message:
Enhance Java Mode to handle Java 5.0 (Tiger) and Java 6 (Mustang).
Contributed by Nathaniel Flath.
Any suggestions? :-/
^ permalink raw reply [flat|nested] 9+ messages in thread
end of thread, other threads:[~2011-02-13 20:41 UTC | newest]
Thread overview: 9+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2010-12-24 8:28 bug#7722: 24.0.50; Finding this C++ header file drops emacs into a infinite loop Tassilo Horn
2011-01-22 20:37 ` Chong Yidong
2011-01-27 0:55 ` Chong Yidong
2011-01-30 21:23 ` Daniel Colascione
2011-02-04 22:22 ` Alan Mackenzie
2011-02-06 19:20 ` Tassilo Horn
2011-02-12 1:25 ` Chong Yidong
2011-02-13 12:20 ` Alan Mackenzie
2011-02-13 20:41 ` Chong Yidong
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