Package: emacs;
Reported by: Tassilo Horn <tsdh <at> gnu.org>
Date: Wed, 9 Sep 2015 06:06:01 UTC
Severity: normal
Found in version 25.0.50
Done: Eli Zaretskii <eliz <at> gnu.org>
Bug is archived. No further changes may be made.
View this message in rfc822 format
From: help-debbugs <at> gnu.org (GNU bug Tracking System) To: Eli Zaretskii <eliz <at> gnu.org> Cc: tracker <at> debbugs.gnu.org Subject: bug#21438: closed (25.0.50; GUD locals frame/window doesn't shows struct values as nil) Date: Wed, 09 Sep 2015 15:58:02 +0000
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Your message dated Wed, 09 Sep 2015 18:57:21 +0300 with message-id <83pp1r60wu.fsf <at> gnu.org> and subject line Re: bug#21438: 25.0.50; GUD locals frame/window doesn't shows struct values as nil has caused the debbugs.gnu.org bug report #21438, regarding 25.0.50; GUD locals frame/window doesn't shows struct values as nil to be marked as done. (If you believe you have received this mail in error, please contact help-debbugs <at> gnu.org.) -- 21438: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=21438 GNU Bug Tracking System Contact help-debbugs <at> gnu.org with problems
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From: Tassilo Horn <tsdh <at> gnu.org> To: bug-gnu-emacs <at> gnu.org Subject: 25.0.50; GUD locals frame/window doesn't shows struct values as nil Date: Wed, 09 Sep 2015 08:04:49 +0200When debugging C code with M-x gdb and enabling the locals window or frame, the values of structs (just structs, no struct pointers) are always displayed as nil. For example, when debugging in xdisp.c --8<---------------cut here---------------start------------->8--- DEFUN ("line-pixel-height", Fline_pixel_height, Sline_pixel_height, 0, 0, 0, doc: /* Return height in pixels of text line in the selected window. Value is the height in pixels of the line at point. */) (void) { struct it it; struct text_pos pt; struct window *w = XWINDOW (selected_window); struct buffer *old_buffer = NULL; Lisp_Object result; ... } --8<---------------cut here---------------end--------------->8--- and stepping till the end of the function, this is the contents of the locals buffer shows: --8<---------------cut here---------------start------------->8--- struct it it nil struct text_pos pt nil struct window * w 0x12a1d40 struct buffer * old_buffer 0x0 Lisp_Object result 58 --8<---------------cut here---------------end--------------->8--- But it and pt cannot be NULL/nil (and they are not when checking with "info locals" in the GUD GDB buffer). The reason for that is that GUD uses the GDB command "-stack-list-locals --thread X --simple-values" as defined in gdb-mi.el:3991 which returns: locals=[{name="it",type="struct it"}, {name="pt",type="struct text_pos"}, {name="w",type="struct window *",value="0x12a1d40"}, {name="old_buffer",type="struct buffer *",value="0x0"}, {name="result",type="Lisp_Object",value="58"}] Note that the entries for the two structs it and pt don't have a value field. I guess the usage of --simple-values is intentional, and in fact, when trying to use "--all-values" instead I get a error in process filter: gdb-jsonify-buffer: Stack overflow in regexp matcher I'm not actually sure if it would be benefitical to use --all-values even if that regexp matching error was fixed because the structs can be really large. But at least the value should not be shown as "nil" but as "<non-simple value>" or something else which makes it obvious that the displayed value is not the real value. In GNU Emacs 25.0.50.15 (x86_64-unknown-linux-gnu, GTK+ Version 3.16.6) of 2015-09-09 Repository revision: 39dca94701de81d02c75316e32d67e3677bd685d Windowing system distributor 'The X.Org Foundation', version 11.0.11702000 System Description: Arch Linux Configured using: 'configure 'CFLAGS=-g -ggdb3 -O0'' Configured features: XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GCONF GSETTINGS NOTIFY ACL GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 Important settings: value of $LC_MONETARY: de_DE.utf8 value of $LC_NUMERIC: de_DE.utf8 value of $LC_TIME: de_DE.utf8 value of $LANG: en_US.utf8 locale-coding-system: utf-8-unix Major mode: Debugger Minor modes in effect: diff-auto-refine-mode: t global-company-mode: t shell-dirtrack-mode: t global-aggressive-indent-mode: t pdf-occur-global-minor-mode: t recentf-mode: t global-subword-mode: t subword-mode: t save-place-mode: t savehist-mode: t show-paren-mode: t ivy-mode: t minibuffer-depth-indicate-mode: t electric-pair-mode: t tooltip-mode: t global-eldoc-mode: t electric-indent-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 messages: Type C-x 1 to delete the help window. mouse-2, RET: find function's definition Unable to find location in file Entering debugger... 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/home/horn/Repos/el/emacs/lisp/gnus/score-mode ~/Repos/el/gnus/lisp/gnus-topic hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-topic ~/Repos/el/gnus/lisp/gnus-cache hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-cache ~/Repos/el/gnus/lisp/nnmail hides /home/horn/Repos/el/emacs/lisp/gnus/nnmail ~/Repos/el/gnus/lisp/gnus-vm hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-vm ~/Repos/el/gnus/lisp/gnus-sync hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-sync ~/Repos/el/gnus/lisp/nnoo hides /home/horn/Repos/el/emacs/lisp/gnus/nnoo ~/Repos/el/gnus/lisp/nnregistry hides /home/horn/Repos/el/emacs/lisp/gnus/nnregistry ~/Repos/el/gnus/lisp/gnus-dup hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-dup ~/Repos/el/gnus/lisp/parse-time hides /home/horn/Repos/el/emacs/lisp/calendar/parse-time ~/Repos/el/gnus/lisp/time-date hides /home/horn/Repos/el/emacs/lisp/calendar/time-date Features: (shadow sort mail-extr gnus-msg emacsbug sendmail misearch multi-isearch hippie-exp debug eieio-opt speedbar sb-image 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[Message part 3 (message/rfc822, inline)]
From: Eli Zaretskii <eliz <at> gnu.org> To: Tassilo Horn <tsdh <at> gnu.org> Cc: 21438-done <at> debbugs.gnu.org Subject: Re: bug#21438: 25.0.50; GUD locals frame/window doesn't shows struct values as nil Date: Wed, 09 Sep 2015 18:57:21 +0300> From: Tassilo Horn <tsdh <at> gnu.org> > Cc: 21438 <at> debbugs.gnu.org > Date: Wed, 09 Sep 2015 17:10:10 +0200 > > >> I'm not actually sure if it would be benefitical to use --all-values > >> even if that regexp matching error was fixed because the structs can be > >> really large. But at least the value should not be shown as "nil" but > >> as "<non-simple value>" or something else which makes it obvious that > >> the displayed value is not the real value. > > > > Like the patch below? If you think it's OK, I will push it. > > Yes, that's exactly what I had in mind. Thanks, pushed.
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