GNU bug report logs - #22644
CC Mode 5.33 (C++/l); Cache error when editing template

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Michael Welsh Duggan <mwd <at> md5i.com>
To: submit <at> debbugs.gnu.org
Subject: CC Mode 5.33 (C++/l); Cache error when editing template
Date: Fri, 12 Feb 2016 11:35:11 -0500

[Message part 1 (text/plain, inline)]

This recipe is very specific.  Small deviations have caused this not to
trigger for no reason that I can determine.

emacs -Q matchertags.hpp

M-x c-toggle-parse-state-debug RET
C-v C-n C-n C-n C-n C-n C-n C-n        // Should be on std::conditional line
M-f M-f M-f M-f C-f                    // Should be on ::value
M-d ( )

This causes the following output:

c-parse-state inconsistency at 774: using cache: (412 (368 . 391) 293), from scratch: ((706 . 708) 412 (368 . 391) 293)
Old state:
(setq c-state-cache ’(412 (368 . 391) 293)  c-state-cache-good-pos 708  c-state-nonlit-pos-cache nil  c-state-nonlit-pos-cache-limit 802  c-state-semi-nonlit-pos-cache nil  c-state-semi-nonlit-pos-cache-limit 802  c-state-brace-pair-desert ’(412 . 803)  c-state-point-min 1  c-state-point-min-lit-type nil  c-state-point-min-lit-start nil  c-state-min-scan-pos 1  c-state-old-cpp-beg nil  c-state-old-cpp-end nil  c-parse-state-point 711)
c-parse-state inconsistency at 778: using cache: (412 (368 . 391) 293), from scratch: ((706 . 708) 412 (368 . 391) 293)
Old state:
(setq c-state-cache ’(412 (368 . 391) 293)  c-state-cache-good-pos 708  c-state-nonlit-pos-cache nil  c-state-nonlit-pos-cache-limit 802  c-state-semi-nonlit-pos-cache nil  c-state-semi-nonlit-pos-cache-limit 802  c-state-brace-pair-desert ’(412 . 803)  c-state-point-min 1  c-state-point-min-lit-type nil  c-state-point-min-lit-start nil  c-state-min-scan-pos 1  c-state-old-cpp-beg nil  c-state-old-cpp-end nil  c-parse-state-point 774)

[matchertags.hpp (text/x-c++hdr, attachment)]

[Message part 3 (text/plain, inline)]

Emacs  : GNU Emacs 25.0.50.3 (x86_64-pc-linux-gnu, X toolkit)
 of 2016-01-19
Package: CC Mode 5.33 (C++/l)
Buffer Style: Pharos
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
 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 '((brace-list-open) (brace-entry-open)
			  (statement-cont) (substatement-open after)
			  (block-close . c-snug-do-while)
			  (extern-lang-open after) (namespace-open after)
			  (module-open after) (composition-open after)
			  (inexpr-class-open after)
			  (inexpr-class-close before) (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 . 0)
		   (brace-list-intro . +)
		   (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 . c-lineup-topmost-intro-cont)
		   (brace-list-open . 0)
		   (inline-open . +)
		   (arglist-close . +)
		   (arglist-intro . +)
		   (statement-cont . +)
		   (statement-case-open . 0)
		   (label . 2)
		   (substatement-label . 2)
		   (substatement-open . +)
		   (knr-argdecl-intro . +)
		   (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 0
 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 95
 paragraph-start "[ 	]*\\(//+\\|\\**\\)[ 	]*$\\|^\f"
 adaptive-fill-mode t
 adaptive-fill-regexp "[ 	]*\\(//+\\|\\**\\)[ 	]*\\([ 	]*\\([-–!|#%;>*·•‣⁃◦]+[ 	]*\\)*\\)"
 )

-- 
Michael Welsh Duggan
(md5i <at> md5i.com)

Message #8 received at 22644 <at> debbugs.gnu.org (full text, mbox):

From: Alan Mackenzie <acm <at> muc.de>
To: Michael Welsh Duggan <mwd <at> md5i.com>
Cc: 22644 <at> debbugs.gnu.org
Subject: Re: bug#22644: CC Mode 5.33 (C++/l); Cache error when editing template
Date: Mon, 15 Feb 2016 21:56:39 +0000

Hello, Michael.

On Fri, Feb 12, 2016 at 11:35:11AM -0500, Michael Welsh Duggan wrote:
> This recipe is very specific.  Small deviations have caused this not to
> trigger for no reason that I can determine.

I'm afraid I can't reproduce it at all.  My window size on emacs -Q in X
Windows appears to be two lines higher than yours.  So I tried just
starting emacs -Q, then C-x C-f'ing the file, then proceding as in your
recipe.  I still can't get it to trigger the error.  Yet.

> emacs -Q matchertags.hpp

> M-x c-toggle-parse-state-debug RET
> C-v C-n C-n C-n C-n C-n C-n C-n        // Should be on std::conditional line
> M-f M-f M-f M-f C-f                    // Should be on ::value
> M-d ( )

> This causes the following output:

> c-parse-state inconsistency at 774: using cache: (412 (368 . 391) 293), from scratch: ((706 . 708) 412 (368 . 391) 293)
> Old state:
> (setq c-state-cache ’(412 (368 . 391) 293)  c-state-cache-good-pos 708  c-state-nonlit-pos-cache nil  c-state-nonlit-pos-cache-limit 802  c-state-semi-nonlit-pos-cache nil  c-state-semi-nonlit-pos-cache-limit 802  c-state-brace-pair-desert ’(412 . 803)  c-state-point-min 1  c-state-point-min-lit-type nil  c-state-point-min-lit-start nil  c-state-min-scan-pos 1  c-state-old-cpp-beg nil  c-state-old-cpp-end nil  c-parse-state-point 711)
> c-parse-state inconsistency at 778: using cache: (412 (368 . 391) 293), from scratch: ((706 . 708) 412 (368 . 391) 293)
> Old state:
> (setq c-state-cache ’(412 (368 . 391) 293)  c-state-cache-good-pos 708  c-state-nonlit-pos-cache nil  c-state-nonlit-pos-cache-limit 802  c-state-semi-nonlit-pos-cache nil  c-state-semi-nonlit-pos-cache-limit 802  c-state-brace-pair-desert ’(412 . 803)  c-state-point-min 1  c-state-point-min-lit-type nil  c-state-point-min-lit-start nil  c-state-min-scan-pos 1  c-state-old-cpp-beg nil  c-state-old-cpp-end nil  c-parse-state-point 774)

The sad thing there is that the first "old state" shown is already
wrong: seeing as how the previous `c-parse-state' was done with point at
711 (the value of `c-parse-state-point'), it should have recorded the
brace pair at (706 . 708).  I don't know why this didn't show up itself
as an inconsistency.

If I don't manage to make progress, I may well be asking you to run a
changed version of cc-engine.elc which would record every
`c-parse-state' call, not just those generating inconsistencies.

[ .... ]

> -- 
> Michael Welsh Duggan
> (md5i <at> md5i.com)

-- 
Alan Mackenzie (Nuremberg, Germany).

Message #13 received at 22644-done <at> debbugs.gnu.org (full text, mbox):

From: Alan Mackenzie <acm <at> muc.de>
To: Michael Welsh Duggan <mwd <at> md5i.com>
Cc: 22644-done <at> debbugs.gnu.org
Subject: Re: bug#22644: CC Mode 5.33 (C++/l); Cache error when editing template
Date: Wed, 17 Feb 2016 11:59:00 +0000

Bug fixed.

-- 
Alan Mackenzie (Nuremberg, Germany).

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