GNU bug report logs - #21438
25.0.50; GUD locals frame/window doesn't shows struct values as nil

Previous Next

To add a comment to this bug, you must first unarchive it, by sending
a message to control AT debbugs.gnu.org, with unarchive 21438 in the body.
You can then email your comments to 21438 AT debbugs.gnu.org in the normal way.

Toggle the display of automated, internal messages from the tracker.

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

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 +0200

When 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...
Back to top level
Quit
"-stack-list-locals --thread 1"
Quit
"-stack-list-locals --thread 1 --simple-values"
Mark set [2 times]
Quit [3 times]

Load-path shadows:
~/Repos/el/auctex/lpath hides ~/Repos/el/gnus/lisp/lpath
~/Repos/el/highlight-symbol.el/highlight-symbol hides /home/horn/.emacs.d/elpa/highlight-symbol-20150816.628/highlight-symbol
~/Repos/el/gnus/lisp/md4 hides /home/horn/Repos/el/emacs/lisp/md4
~/Repos/el/gnus/lisp/color hides /home/horn/Repos/el/emacs/lisp/color
~/Repos/el/gnus/lisp/format-spec hides /home/horn/Repos/el/emacs/lisp/format-spec
~/Repos/el/gnus/lisp/password-cache hides /home/horn/Repos/el/emacs/lisp/password-cache
~/Repos/el/gnus/lisp/hex-util hides /home/horn/Repos/el/emacs/lisp/hex-util
~/Repos/el/gnus/lisp/dns-mode hides /home/horn/Repos/el/emacs/lisp/textmodes/dns-mode
~/Repos/el/gnus/lisp/dig hides /home/horn/Repos/el/emacs/lisp/net/dig
~/Repos/el/gnus/lisp/hmac-md5 hides /home/horn/Repos/el/emacs/lisp/net/hmac-md5
~/Repos/el/gnus/lisp/ntlm hides /home/horn/Repos/el/emacs/lisp/net/ntlm
~/Repos/el/gnus/lisp/hmac-def hides /home/horn/Repos/el/emacs/lisp/net/hmac-def
~/Repos/el/gnus/lisp/rfc2104 hides /home/horn/Repos/el/emacs/lisp/net/rfc2104
~/Repos/el/gnus/lisp/sasl-ntlm hides /home/horn/Repos/el/emacs/lisp/net/sasl-ntlm
~/Repos/el/gnus/lisp/sasl-cram hides /home/horn/Repos/el/emacs/lisp/net/sasl-cram
~/Repos/el/gnus/lisp/dns hides /home/horn/Repos/el/emacs/lisp/net/dns
~/Repos/el/gnus/lisp/sasl hides /home/horn/Repos/el/emacs/lisp/net/sasl
~/Repos/el/gnus/lisp/tls hides /home/horn/Repos/el/emacs/lisp/net/tls
~/Repos/el/gnus/lisp/sasl-scram-rfc hides /home/horn/Repos/el/emacs/lisp/net/sasl-scram-rfc
~/Repos/el/gnus/lisp/netrc hides /home/horn/Repos/el/emacs/lisp/net/netrc
~/Repos/el/gnus/lisp/sasl-digest hides /home/horn/Repos/el/emacs/lisp/net/sasl-digest
~/Repos/el/gnus/lisp/uudecode hides /home/horn/Repos/el/emacs/lisp/mail/uudecode
~/Repos/el/gnus/lisp/binhex hides /home/horn/Repos/el/emacs/lisp/mail/binhex
~/Repos/el/gnus/lisp/hashcash hides /home/horn/Repos/el/emacs/lisp/mail/hashcash
~/Repos/el/gnus/lisp/canlock hides /home/horn/Repos/el/emacs/lisp/gnus/canlock
~/Repos/el/gnus/lisp/nneething hides /home/horn/Repos/el/emacs/lisp/gnus/nneething
~/Repos/el/gnus/lisp/mm-encode hides /home/horn/Repos/el/emacs/lisp/gnus/mm-encode
~/Repos/el/gnus/lisp/mm-util hides /home/horn/Repos/el/emacs/lisp/gnus/mm-util
~/Repos/el/gnus/lisp/rfc2047 hides /home/horn/Repos/el/emacs/lisp/gnus/rfc2047
~/Repos/el/gnus/lisp/nnml hides /home/horn/Repos/el/emacs/lisp/gnus/nnml
~/Repos/el/gnus/lisp/gnus-cus hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-cus
~/Repos/el/gnus/lisp/gnus-range hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-range
~/Repos/el/gnus/lisp/gnus-int hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-int
~/Repos/el/gnus/lisp/gnus-cloud hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-cloud
~/Repos/el/gnus/lisp/spam-stat hides /home/horn/Repos/el/emacs/lisp/gnus/spam-stat
~/Repos/el/gnus/lisp/nnmh hides /home/horn/Repos/el/emacs/lisp/gnus/nnmh
~/Repos/el/gnus/lisp/gnus-mlspl hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-mlspl
~/Repos/el/gnus/lisp/deuglify hides /home/horn/Repos/el/emacs/lisp/gnus/deuglify
~/Repos/el/gnus/lisp/gnus-gravatar hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-gravatar
~/Repos/el/gnus/lisp/nngateway hides /home/horn/Repos/el/emacs/lisp/gnus/nngateway
~/Repos/el/gnus/lisp/ietf-drums hides /home/horn/Repos/el/emacs/lisp/gnus/ietf-drums
~/Repos/el/gnus/lisp/mail-parse hides /home/horn/Repos/el/emacs/lisp/gnus/mail-parse
~/Repos/el/gnus/lisp/gnus-salt hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-salt
~/Repos/el/gnus/lisp/nnimap hides /home/horn/Repos/el/emacs/lisp/gnus/nnimap
~/Repos/el/gnus/lisp/gnus-draft hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-draft
~/Repos/el/gnus/lisp/mail-source hides /home/horn/Repos/el/emacs/lisp/gnus/mail-source
~/Repos/el/gnus/lisp/messcompat hides /home/horn/Repos/el/emacs/lisp/gnus/messcompat
~/Repos/el/gnus/lisp/pop3 hides /home/horn/Repos/el/emacs/lisp/gnus/pop3
~/Repos/el/gnus/lisp/nnmaildir hides /home/horn/Repos/el/emacs/lisp/gnus/nnmaildir
~/Repos/el/gnus/lisp/nnheader hides /home/horn/Repos/el/emacs/lisp/gnus/nnheader
~/Repos/el/gnus/lisp/gnus-cite hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-cite
~/Repos/el/gnus/lisp/nndiary hides /home/horn/Repos/el/emacs/lisp/gnus/nndiary
~/Repos/el/gnus/lisp/gnus-diary hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-diary
~/Repos/el/gnus/lisp/nnfolder hides /home/horn/Repos/el/emacs/lisp/gnus/nnfolder
~/Repos/el/gnus/lisp/gnus-art hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-art
~/Repos/el/gnus/lisp/gnus-demon hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-demon
~/Repos/el/gnus/lisp/mml-sec hides /home/horn/Repos/el/emacs/lisp/gnus/mml-sec
~/Repos/el/gnus/lisp/nnir hides /home/horn/Repos/el/emacs/lisp/gnus/nnir
~/Repos/el/gnus/lisp/mm-partial hides /home/horn/Repos/el/emacs/lisp/gnus/mm-partial
~/Repos/el/gnus/lisp/gnus-registry hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-registry
~/Repos/el/gnus/lisp/gnus-icalendar hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-icalendar
~/Repos/el/gnus/lisp/compface hides /home/horn/Repos/el/emacs/lisp/gnus/compface
~/Repos/el/gnus/lisp/gnus-fun hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-fun
~/Repos/el/gnus/lisp/gnus-start hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-start
~/Repos/el/gnus/lisp/smiley hides /home/horn/Repos/el/emacs/lisp/gnus/smiley
~/Repos/el/gnus/lisp/gnus-picon hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-picon
~/Repos/el/gnus/lisp/spam-report hides /home/horn/Repos/el/emacs/lisp/gnus/spam-report
~/Repos/el/gnus/lisp/nntp hides /home/horn/Repos/el/emacs/lisp/gnus/nntp
~/Repos/el/gnus/lisp/nnnil hides /home/horn/Repos/el/emacs/lisp/gnus/nnnil
~/Repos/el/gnus/lisp/nndir hides /home/horn/Repos/el/emacs/lisp/gnus/nndir
~/Repos/el/gnus/lisp/gnus-srvr hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-srvr
~/Repos/el/gnus/lisp/smime hides /home/horn/Repos/el/emacs/lisp/gnus/smime
~/Repos/el/gnus/lisp/nnvirtual hides /home/horn/Repos/el/emacs/lisp/gnus/nnvirtual
~/Repos/el/gnus/lisp/gnus-notifications hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-notifications
~/Repos/el/gnus/lisp/nnspool hides /home/horn/Repos/el/emacs/lisp/gnus/nnspool
~/Repos/el/gnus/lisp/gnus-group hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-group
~/Repos/el/gnus/lisp/gnus-bcklg hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-bcklg
~/Repos/el/gnus/lisp/gnus-util hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-util
~/Repos/el/gnus/lisp/gnus-sieve hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-sieve
~/Repos/el/gnus/lisp/nndraft hides /home/horn/Repos/el/emacs/lisp/gnus/nndraft
~/Repos/el/gnus/lisp/nnagent hides /home/horn/Repos/el/emacs/lisp/gnus/nnagent
~/Repos/el/gnus/lisp/gnus-spec hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-spec
~/Repos/el/gnus/lisp/gnus-bookmark hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-bookmark
~/Repos/el/gnus/lisp/mml1991 hides /home/horn/Repos/el/emacs/lisp/gnus/mml1991
~/Repos/el/gnus/lisp/rfc2231 hides /home/horn/Repos/el/emacs/lisp/gnus/rfc2231
~/Repos/el/gnus/lisp/yenc hides /home/horn/Repos/el/emacs/lisp/gnus/yenc
~/Repos/el/gnus/lisp/gnus-undo hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-undo
~/Repos/el/gnus/lisp/ecomplete hides /home/horn/Repos/el/emacs/lisp/gnus/ecomplete
~/Repos/el/gnus/lisp/legacy-gnus-agent hides /home/horn/Repos/el/emacs/lisp/gnus/legacy-gnus-agent
~/Repos/el/gnus/lisp/utf7 hides /home/horn/Repos/el/emacs/lisp/gnus/utf7
~/Repos/el/gnus/lisp/rtree hides /home/horn/Repos/el/emacs/lisp/gnus/rtree
~/Repos/el/gnus/lisp/gnus-uu hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-uu
~/Repos/el/gnus/lisp/gnus-ml hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-ml
~/Repos/el/gnus/lisp/sieve hides /home/horn/Repos/el/emacs/lisp/gnus/sieve
~/Repos/el/gnus/lisp/gnus hides /home/horn/Repos/el/emacs/lisp/gnus/gnus
~/Repos/el/gnus/lisp/mml hides /home/horn/Repos/el/emacs/lisp/gnus/mml
~/Repos/el/gnus/lisp/message hides /home/horn/Repos/el/emacs/lisp/gnus/message
~/Repos/el/gnus/lisp/mml-smime hides /home/horn/Repos/el/emacs/lisp/gnus/mml-smime
~/Repos/el/gnus/lisp/gnus-eform hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-eform
~/Repos/el/gnus/lisp/gnus-agent hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-agent
~/Repos/el/gnus/lisp/gnus-logic hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-logic
~/Repos/el/gnus/lisp/mm-extern hides /home/horn/Repos/el/emacs/lisp/gnus/mm-extern
~/Repos/el/gnus/lisp/nndoc hides /home/horn/Repos/el/emacs/lisp/gnus/nndoc
~/Repos/el/gnus/lisp/sieve-manage hides /home/horn/Repos/el/emacs/lisp/gnus/sieve-manage
~/Repos/el/gnus/lisp/mm-decode hides /home/horn/Repos/el/emacs/lisp/gnus/mm-decode
~/Repos/el/gnus/lisp/starttls hides /home/horn/Repos/el/emacs/lisp/gnus/starttls
~/Repos/el/gnus/lisp/gnus-dired hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-dired
~/Repos/el/gnus/lisp/nnbabyl hides /home/horn/Repos/el/emacs/lisp/gnus/nnbabyl
~/Repos/el/gnus/lisp/nnmbox hides /home/horn/Repos/el/emacs/lisp/gnus/nnmbox
~/Repos/el/gnus/lisp/gnus-win hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-win
~/Repos/el/gnus/lisp/gnus-async hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-async
~/Repos/el/gnus/lisp/mm-url hides /home/horn/Repos/el/emacs/lisp/gnus/mm-url
~/Repos/el/gnus/lisp/gnus-html hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-html
~/Repos/el/gnus/lisp/gssapi hides /home/horn/Repos/el/emacs/lisp/gnus/gssapi
~/Repos/el/gnus/lisp/mml2015 hides /home/horn/Repos/el/emacs/lisp/gnus/mml2015
~/Repos/el/gnus/lisp/nnrss hides /home/horn/Repos/el/emacs/lisp/gnus/nnrss
~/Repos/el/gnus/lisp/gnus-mh hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-mh
~/Repos/el/gnus/lisp/gnus-sum hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-sum
~/Repos/el/gnus/lisp/nnweb hides /home/horn/Repos/el/emacs/lisp/gnus/nnweb
~/Repos/el/gnus/lisp/mail-prsvr hides /home/horn/Repos/el/emacs/lisp/gnus/mail-prsvr
~/Repos/el/gnus/lisp/nnmairix hides /home/horn/Repos/el/emacs/lisp/gnus/nnmairix
~/Repos/el/gnus/lisp/plstore hides /home/horn/Repos/el/emacs/lisp/gnus/plstore
~/Repos/el/gnus/lisp/rfc2045 hides /home/horn/Repos/el/emacs/lisp/gnus/rfc2045
~/Repos/el/gnus/lisp/gnus-msg hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-msg
~/Repos/el/gnus/lisp/spam-wash hides /home/horn/Repos/el/emacs/lisp/gnus/spam-wash
~/Repos/el/gnus/lisp/gnus-score hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-score
~/Repos/el/gnus/lisp/mm-uu hides /home/horn/Repos/el/emacs/lisp/gnus/mm-uu
~/Repos/el/gnus/lisp/spam hides /home/horn/Repos/el/emacs/lisp/gnus/spam
~/Repos/el/gnus/lisp/mm-view hides /home/horn/Repos/el/emacs/lisp/gnus/mm-view
~/Repos/el/gnus/lisp/sieve-mode hides /home/horn/Repos/el/emacs/lisp/gnus/sieve-mode
~/Repos/el/gnus/lisp/html2text hides /home/horn/Repos/el/emacs/lisp/gnus/html2text
~/Repos/el/gnus/lisp/gnus-ems hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-ems
~/Repos/el/gnus/lisp/registry hides /home/horn/Repos/el/emacs/lisp/gnus/registry
~/Repos/el/gnus/lisp/auth-source hides /home/horn/Repos/el/emacs/lisp/gnus/auth-source
~/Repos/el/gnus/lisp/gravatar hides /home/horn/Repos/el/emacs/lisp/gnus/gravatar
~/Repos/el/gnus/lisp/flow-fill hides /home/horn/Repos/el/emacs/lisp/gnus/flow-fill
~/Repos/el/gnus/lisp/gmm-utils hides /home/horn/Repos/el/emacs/lisp/gnus/gmm-utils
~/Repos/el/gnus/lisp/mailcap hides /home/horn/Repos/el/emacs/lisp/gnus/mailcap
~/Repos/el/gnus/lisp/gnus-delay hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-delay
~/Repos/el/gnus/lisp/mm-bodies hides /home/horn/Repos/el/emacs/lisp/gnus/mm-bodies
~/Repos/el/gnus/lisp/mm-archive hides /home/horn/Repos/el/emacs/lisp/gnus/mm-archive
~/Repos/el/gnus/lisp/rfc1843 hides /home/horn/Repos/el/emacs/lisp/gnus/rfc1843
~/Repos/el/gnus/lisp/gnus-kill hides /home/horn/Repos/el/emacs/lisp/gnus/gnus-kill
~/Repos/el/gnus/lisp/qp hides /home/horn/Repos/el/emacs/lisp/gnus/qp
~/Repos/el/gnus/lisp/score-mode hides /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 ezimage dframe gdb-mi
bindat json gud find-dired grep smex ido seq vc vc-dispatcher vc-git
diff-mode cc-mode cc-fonts cc-guess cc-menus cc-cmds cc-styles cc-align
cc-engine cc-vars cc-defs colir color company-files company-oddmuse
company-keywords company-etags company-gtags company-dabbrev-code
company-dabbrev company-capf company-cmake company-xcode company-clang
company-semantic company-eclim company-template company-css company-nxml
company-bbdb company stratego-mode greql-mode tg-mode generic
preview-latex tex-site auto-loads cider tramp-sh cider-debug
cider-browse-ns cider-inspector cider-mode cider-repl cider-eldoc
cider-interaction spinner arc-mode archive-mode cider-overlays cider-doc
org-table org org-macro org-footnote org-pcomplete org-list org-faces
org-entities org-version ob-emacs-lisp ob ob-tangle ob-ref ob-lob
ob-table ob-exp org-src ob-keys ob-comint ob-core ob-eval org-compat
org-macs org-loaddefs cal-menu calendar cal-loaddefs cider-test
cider-stacktrace cider-client cider-util nrepl-client tramp tramp-compat
tramp-loaddefs trampver shell pcomplete queue ewoc etags xref project
dash clojure-mode paredit aggressive-indent epa-file epa epg rdictcc
google-contacts-message google-contacts xml url-cache google-oauth
google-contacts-gnus gnus-art mm-uu mml2015 mm-view mml-smime smime dig
gnus-sum gnus-group gnus-undo gnus-start gnus-cloud nnimap nnmail
mail-source tls utf7 netrc nnoo parse-time gnus-spec gnus-int gnus-range
gnus-win gnus gnus-ems gnus-compat url url-proxy url-privacy url-expand
url-methods url-history url-cookie url-domsuf url-util url-parse
auth-source password-cache url-vars mailcap nnheader gnus-util dired-x
em-term term ehelp esh-opt esh-ext esh-util highlight-symbol thingatpt
boxquote rect ecomplete message rfc822 mml mml-sec mm-decode mm-bodies
mm-encode mail-parse rfc2231 rfc2047 rfc2045 ietf-drums mm-util help-fns
mail-prsvr mailabbrev mail-utils gmm-utils mailheader server yasnippet
disp-table noutline outline pdf-occur ibuf-ext ibuffer tablist
tablist-filter semantic/wisent/comp semantic/wisent
semantic/wisent/wisent semantic/util-modes semantic/util semantic
semantic/tag semantic/lex semantic/fw eieio byte-opt bytecomp
byte-compile cconv eieio-core mode-local find-func cedet dired
pdf-isearch let-alist pdf-misc imenu pdf-tools compile comint ansi-color
cus-edit cus-start cus-load pdf-view bookmark pp jka-compr pdf-cache
pdf-info tq pdf-util format-spec image-mode browse-kill-ring derived
recentf tree-widget wid-edit highlight-parentheses cl iedit iedit-lib
cl-extra help-mode hydra lv counsel swiper cap-words superword subword
saveplace savehist paren ivy delsel icomplete mb-depth ace-window
easy-mmode cl-macs gv avy ring smart-mode-line-respectful-theme
smart-mode-line-light-theme cl-seq smart-mode-line rich-minority rx bs
elec-pair edmacro kmacro cl-loaddefs cl-lib gnus-load subr-x pcase
tsdh-light-theme finder-inf memory-usage-autoloads advice info package
easymenu epg-config time-date mule-util tooltip eldoc electric uniquify
ediff-hook vc-hooks lisp-float-type mwheel x-win term/common-win x-dnd
tool-bar dnd fontset image regexp-opt fringe tabulated-list newcomment
elisp-mode lisp-mode prog-mode register page menu-bar rfn-eshadow timer
select scroll-bar mouse jit-lock font-lock syntax facemenu font-core
frame cl-generic cham georgian utf-8-lang misc-lang vietnamese tibetan
thai tai-viet lao korean japanese eucjp-ms cp51932 hebrew greek romanian
slovak czech european ethiopic indian cyrillic chinese charscript
case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer
cl-preloaded nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote dbusbind inotify
dynamic-setting system-font-setting font-render-setting move-toolbar gtk
x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 811381 90006)
 (symbols 48 52202 16)
 (miscs 40 596 637)
 (strings 32 121930 8084)
 (string-bytes 1 4091076)
 (vectors 16 51794)
 (vector-slots 8 1020916 58214)
 (floats 8 825 788)
 (intervals 56 86068 3496)
 (buffers 976 25)
 (heap 1024 65057 3076))

Message #8 received at 21438 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Tassilo Horn <tsdh <at> gnu.org>
Cc: 21438 <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 17:14:24 +0300

> From: Tassilo Horn <tsdh <at> gnu.org>
> Date: Wed, 09 Sep 2015 08:04:49 +0200
> 
> 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

Yes, the use of --simple-values is intentional.  If you want to see
the values of the fields, you need to click mouse-2 on the variable
name, and then Emacs will pop up a frame with the fields.

> 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.

Thanks.

--- lisp/progmodes/gdb-mi.el~0	2015-05-20 08:22:42.000000000 +0300
+++ lisp/progmodes/gdb-mi.el	2015-09-09 16:47:24.399310500 +0300
@@ -4038,6 +4038,8 @@
       (let ((name (bindat-get-field local 'name))
             (value (bindat-get-field local 'value))
             (type (bindat-get-field local 'type)))
+        (when (not value)
+          (setq value "<complex data type>"))
         (if (or (not value)
                 (string-match "\\0x" value))
             (add-text-properties 0 (length name)

Message #11 received at 21438 <at> debbugs.gnu.org (full text, mbox):

From: Tassilo Horn <tsdh <at> gnu.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 21438 <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 17:10:10 +0200

Eli Zaretskii <eliz <at> gnu.org> writes:

>> 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
>
> Yes, the use of --simple-values is intentional.  If you want to see
> the values of the fields, you need to click mouse-2 on the variable
> name, and then Emacs will pop up a frame with the fields.

Yes, or I can watch the variable and get a nice speedbar tree view which
I can expand recursively.  Really nice!

>> 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.

Bye,
Tassilo

Message #16 received at 21438-done <at> debbugs.gnu.org (full text, mbox):

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.

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.