--- Begin Message ---
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Subject: |
CC Mode 5.33 (C/*l); Emacs may get stuck with 100% CPU |
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Date: |
Fri, 25 Aug 2017 21:00:52 +0530 |
Emacs always get stuck when writing some code (given below), using 100 % CPU for
(probably) limitless time:
How to reproduce:
1. Open a new empty file: emacs -Q test.c
2. Write the following (| is where the point is)
#include<|
3. Delete the content: C-a C-k
4. Try to write the same again:
#include<|
Result:
At the 4th step, after typing #,GNU Emacs begins to use full CPU and
does nothing. Though this can be cancelled using C-g.
Emacs : GNU Emacs 26.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.11)
of 2017-08-25
Package: CC Mode 5.33 (C/*l)
Buffer Style: gnu
c-emacs-features: (pps-extended-state col-0-paren posix-char-classes
gen-string-delim gen-comment-delim syntax-properties 1-bit)
current state:
==============
(setq
c-basic-offset 2
c-comment-only-line-offset '(0 . 0)
c-indent-comment-alist '((anchored-comment column . 0) (end-block space . 1)
(cpp-end-block space . 2))
c-indent-comments-syntactically-p nil
c-block-comment-prefix ""
c-comment-prefix-regexp '((pike-mode . "//+!?\\|\\**") (awk-mode . "#+")
(other . "//+\\|\\**"))
c-doc-comment-style '((java-mode . javadoc) (pike-mode . autodoc)
(c-mode . gtkdoc))
c-cleanup-list '(scope-operator)
c-hanging-braces-alist '((substatement-open before after)
(arglist-cont-nonempty))
c-hanging-colons-alist nil
c-hanging-semi&comma-criteria '(c-semi&comma-inside-parenlist)
c-backslash-column 48
c-backslash-max-column 72
c-special-indent-hook '(c-gnu-impose-minimum)
c-label-minimum-indentation 1
c-offsets-alist '((inexpr-class . +)
(inexpr-statement . +)
(lambda-intro-cont . +)
(inlambda . c-lineup-inexpr-block)
(template-args-cont c-lineup-template-args +)
(incomposition . +)
(inmodule . +)
(innamespace . +)
(inextern-lang . +)
(composition-close . 0)
(module-close . 0)
(namespace-close . 0)
(extern-lang-close . 0)
(composition-open . 0)
(module-open . 0)
(namespace-open . 0)
(extern-lang-open . 0)
(objc-method-call-cont
c-lineup-ObjC-method-call-colons
c-lineup-ObjC-method-call
+
)
(objc-method-args-cont . c-lineup-ObjC-method-args)
(objc-method-intro . [0])
(friend . 0)
(cpp-define-intro c-lineup-cpp-define +)
(cpp-macro-cont . +)
(cpp-macro . [0])
(inclass . +)
(stream-op . c-lineup-streamop)
(arglist-cont-nonempty
c-lineup-gcc-asm-reg
c-lineup-arglist
)
(arglist-cont c-lineup-gcc-asm-reg 0)
(comment-intro c-lineup-knr-region-comment c-lineup-comment)
(catch-clause . 0)
(else-clause . 0)
(do-while-closure . 0)
(access-label . -)
(case-label . 0)
(substatement . +)
(statement-case-intro . +)
(statement . 0)
(brace-entry-open . 0)
(brace-list-entry . c-lineup-under-anchor)
(brace-list-close . 0)
(block-close . 0)
(block-open . 0)
(inher-cont . c-lineup-multi-inher)
(inher-intro . +)
(member-init-cont . c-lineup-multi-inher)
(member-init-intro . +)
(annotation-var-cont . +)
(annotation-top-cont . 0)
(topmost-intro . 0)
(knr-argdecl . 0)
(func-decl-cont . +)
(inline-close . 0)
(class-close . 0)
(class-open . 0)
(defun-block-intro . +)
(defun-close . 0)
(defun-open . 0)
(c . c-lineup-C-comments)
(string . c-lineup-dont-change)
(topmost-intro-cont
first
c-lineup-topmost-intro-cont
c-lineup-gnu-DEFUN-intro-cont
)
(brace-list-intro . c-lineup-arglist-intro-after-paren)
(brace-list-open . +)
(inline-open . 0)
(arglist-close . c-lineup-arglist)
(arglist-intro . c-lineup-arglist-intro-after-paren)
(statement-cont . +)
(statement-case-open . +)
(label . 0)
(substatement-label . 0)
(substatement-open . +)
(knr-argdecl-intro . 5)
(statement-block-intro . +)
)
c-buffer-is-cc-mode 'c-mode
c-tab-always-indent t
c-syntactic-indentation t
c-syntactic-indentation-in-macros t
c-ignore-auto-fill '(string cpp code)
c-auto-align-backslashes t
c-backspace-function 'backward-delete-char-untabify
c-delete-function 'delete-char
c-electric-pound-behavior nil
c-default-style '((java-mode . "java") (awk-mode . "awk") (other . "gnu"))
c-enable-xemacs-performance-kludge-p nil
c-old-style-variable-behavior nil
defun-prompt-regexp nil
tab-width 8
comment-column 32
parse-sexp-ignore-comments t
parse-sexp-lookup-properties t
auto-fill-function nil
comment-multi-line t
comment-start-skip "\\(//+\\|/\\*+\\)\\s *"
fill-prefix nil
fill-column 70
paragraph-start "[ ]*\\(//+\\|\\**\\)[ ]*$\\|^\f"
adaptive-fill-mode t
adaptive-fill-regexp "[ ]*\\(//+\\|\\**\\)[ ]*\\([
]*\\([-–!|#%;>*·•‣⁃◦]+[ ]*\\)*\\)"
)
--- End Message ---
--- Begin Message ---
|
Subject: |
Re: bug#28233: CC Mode 5.33 (C/*l); Emacs may get stuck with 100% CPU |
|
Date: |
Sun, 27 Aug 2017 10:47:16 +0000 |
|
User-agent: |
Mutt/1.7.2 (2016-11-26) |
Hello, Mohammed.
On Sun, Aug 27, 2017 at 06:54:11 +0530, Mohammed Sadiq wrote:
> > On August 26, 2017 at 10:59 PM Alan Mackenzie <address@hidden> wrote:
> > Hello, Mohammed.
> Hi
> > Yes. There is a bug in some cache handling code for macros, which
> > results in that cache thinking there's still a macro after it's been
> > deleted.
> > Thanks indeed for the bug report!
> > Would you please apply the following patch, then confirm to me that it's
> > fixed the problem, or else tell me what's still not working. Thanks!
> <snipped>
> The patch surely fixed the issue. Thanks
I actually committed a rather simpler patch. The problem was "merely" an
off-by-1 bug, but in the same function.
[ .... ]
--
Alan Mackenzie (Nuremberg, Germany).
--- End Message ---