* bug#36897: 27.0.50; [CC Mode] c-after-change may signal error in narrowed buffer
@ 2019-08-02 0:30 Noam Postavsky
[not found] ` <mailman.507.1564705872.1985.bug-gnu-emacs@gnu.org>
[not found] ` <mailman.530.1564738445.1985.bug-gnu-emacs@gnu.org>
0 siblings, 2 replies; 4+ messages in thread
From: Noam Postavsky @ 2019-08-02 0:30 UTC (permalink / raw)
To: 36897
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Package: emacs, cc-mode
From 'emacs -Q', eval the following:
(with-current-buffer (get-buffer-create "*test*")
(erase-buffer)
(insert "int main()\n{\n \n}\n")
(search-backward "\n}")
(c-mode)
(save-restriction
(narrow-to-region (point) (point))
(insert "foo")))
Gives the backtrace:
Debugger entered--Lisp error: (args-out-of-range 1 1)
get-text-property(1 c-fl-syn-tab)
c-clear-string-fences()
#f(compiled-function () #<bytecode 0xbb39fd>)()
c-after-change(16 19 0)
insert("foo")
(save-restriction (narrow-to-region (point) (point)) (insert "foo"))
(save-current-buffer (set-buffer (get-buffer-create "*test*")) (erase-buffer) (insert "int main()\n{\n \n}\n") (search-backward "\n}") (c-mode) (save-restriction (narrow-to-region (point) (point)) (insert "foo")))
This is a reduced test case from
https://github.com/joaotavora/eglot/issues/291.
I think the obvious fix is to extend the save-restriction just a bit
further to cover c-clear-string-fences, patch attached.
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From 2865541594f18898c234a2ed076879ce2f887693 Mon Sep 17 00:00:00 2001
From: Noam Postavsky <npostavs@gmail.com>
Date: Thu, 1 Aug 2019 20:14:32 -0400
Subject: [PATCH] Fix c-after-change in narrowed buffer
* lisp/progmodes/cc-mode.el (c-after-change): Include the
c-clear-string-fences call in the save-restriction, so that it has
access to the widened buffer.
---
lisp/progmodes/cc-mode.el | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/lisp/progmodes/cc-mode.el b/lisp/progmodes/cc-mode.el
index a5e158933b..9df4224448 100644
--- a/lisp/progmodes/cc-mode.el
+++ b/lisp/progmodes/cc-mode.el
@@ -1989,10 +1989,10 @@ c-after-change
;; When `combine-after-change-calls' is used we might get calls
;; with regions outside the current narrowing. This has been
;; observed in Emacs 20.7.
- (unwind-protect
- (progn
- (c-restore-string-fences (point-min) (point-max))
- (save-restriction
+ (save-restriction
+ (unwind-protect
+ (progn
+ (c-restore-string-fences (point-min) (point-max))
(save-match-data ; c-recognize-<>-arglists changes match-data
(widen)
@@ -2032,8 +2032,8 @@ c-after-change
(save-excursion
(mapc (lambda (fn)
(funcall fn beg end old-len))
- c-before-font-lock-functions)))))
- (c-clear-string-fences))))
+ c-before-font-lock-functions))))
+ (c-clear-string-fences)))))
;; A workaround for syntax-ppss's failure to notice syntax-table text
;; property changes.
(when (fboundp 'syntax-ppss)
--
2.11.0
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In GNU Emacs 27.0.50 (build 23, x86_64-pc-linux-gnu, X toolkit, Xaw scroll bars)
of 2019-07-30 built on minid
Repository revision: 3a59cc84069376802ba8fd731b524d78db58262c
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.11902000
System Description: Debian GNU/Linux 9 (stretch)
Recent messages:
Error during redisplay: (jit-lock-function 18) signaled (args-out-of-range 1 1)
Continuing.
c-clear-string-fences: Args out of range: 1, 1
^ permalink raw reply related [flat|nested] 4+ messages in thread
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2019-08-02 0:30 bug#36897: 27.0.50; [CC Mode] c-after-change may signal error in narrowed buffer Noam Postavsky
[not found] ` <mailman.507.1564705872.1985.bug-gnu-emacs@gnu.org>
2019-08-02 8:41 ` Alan Mackenzie
[not found] ` <mailman.530.1564738445.1985.bug-gnu-emacs@gnu.org>
2019-08-02 10:41 ` Alan Mackenzie
2019-08-02 11:40 ` Noam Postavsky
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