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bug#13046: 23.4; Minimal Example to freeze emacs C++ mode (nasty interac
From: |
Alan Mackenzie |
Subject: |
bug#13046: 23.4; Minimal Example to freeze emacs C++ mode (nasty interaction between templates & windows endline characters ) |
Date: |
Sun, 2 Dec 2012 18:16:23 +0000 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
Hello Yidong, Vadim, John.
On Sun, Dec 02, 2012 at 10:13:47AM +0800, Chong Yidong wrote:
> John Smith <drefleladi@gmail.com> writes:
> > Using emacs -Q,just open the attached minimal example and try typing
> > "std::string" in the body of the function.
> > That should hang emacs forever (or at least it does on my up-to-date
> > ubuntu).
> I think this is a duplicate of Bug#11841.
> The patch posted in Bug#11841 does not completely fix this test case.
> Giving ^M whitespace syntax in CC mode, as Stefan suggested, seems like
> the easiest solution. Alan, could you take another look? It would be
> good to have this fixed in Emacs 24.3.
On Wed, Jul 25, 2012 at 11:58:22PM +0300, Vadim K wrote:
> Hello Alan,
> I've tried your patch and it worked fine for the original posted
> bad.cpp file. However I have found a variation of that file that still
> causes emacs to hang (see attached bad2.cpp).
[ Bug #11841 ]
I think the enclosed patch fixes these bugs. Please try out the patch
and let us know if there are still any problems here.
The basic problem is that (forward-comment -1) doesn't recognise a CR
character as whitespace. My first attempt to patch this, in July, was
only partly successful.
The specific problem was that (forward-comment -1) _sometimes_ goes back
over the LF in CRLF, sometimes not. I've not discovered by what
criterion.
diff -r 1adcc48506f9 cc-engine.el
--- a/cc-engine.el Sun Apr 22 09:42:29 2012 +0000
+++ b/cc-engine.el Sun Dec 02 17:46:53 2012 +0000
@@ -1454,8 +1454,21 @@
;; return t when moving backwards at bob.
(not (bobp))
- (if (let (open-paren-in-column-0-is-defun-start)
- (forward-comment -1))
+ (if (let (open-paren-in-column-0-is-defun-start moved-comment)
+ (while
+ (and (not (setq moved-comment (forward-comment -1)))
+ ;; Cope specifically with ^M^J here -
+ ;; forward-comment sometimes gets stuck after ^Ms,
+ ;; sometimes after ^M^J.
+ (or
+ (when (eq (char-before) ?\r)
+ (backward-char)
+ t)
+ (when (and (eq (char-before) ?\n)
+ (eq (char-before (1- (point))) ?\r))
+ (backward-char 2)
+ t))))
+ moved-comment)
(if (looking-at "\\*/")
;; Emacs <= 20 and XEmacs move back over the
;; closer of a block comment that lacks an opener.
--
Alan Mackenzie (Nuremberg, Germany).
- bug#13046: 23.4; Minimal Example to freeze emacs C++ mode (nasty interaction between templates & windows endline characters ), John Smith, 2012/12/01
- bug#13046: 23.4; Minimal Example to freeze emacs C++ mode (nasty interaction between templates & windows endline characters ), Chong Yidong, 2012/12/01
- bug#13046: 23.4; Minimal Example to freeze emacs C++ mode (nasty interaction between templates & windows endline characters ), Alan Mackenzie, 2012/12/02
- bug#13046: 23.4; Minimal Example to freeze emacs C++ mode (nasty interaction between templates & windows endline characters ),
Alan Mackenzie <=
- bug#13046: 23.4; Minimal Example to freeze emacs C++ mode (nasty interaction between templates & windows endline characters ), John Smith, 2012/12/03
- bug#13046: 23.4; Minimal Example to freeze emacs C++ mode (nasty interaction between templates & windows endline characters ), Alan Mackenzie, 2012/12/05
- bug#13046: 23.4; Minimal Example to freeze emacs C++ mode (nasty interaction between templates & windows endline characters ), John Smith, 2012/12/06
- bug#13046: 23.4; Minimal Example to freeze emacs C++ mode (nasty interaction between templates & windows endline characters ), Alan Mackenzie, 2012/12/09
- bug#13046: 23.4; Minimal Example to freeze emacs C++ mode (nasty interaction between templates & windows endline characters ), John Smith, 2012/12/15
- bug#13046: 23.4; Minimal Example to freeze emacs C++ mode (nasty interaction between templates & windows endline characters ), Chong Yidong, 2012/12/08
- bug#13046: 23.4; Minimal Example to freeze emacs C++ mode (nasty interaction between templates & windows endline characters ), Vadim K, 2012/12/09