GNU bug report logs - #17250
24.3; find-variable gives search-failed error message

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

From: Johan Claesson <johanclaesson <at> bredband.net>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.3; find-variable gives search-failed error message
Date: Sat, 12 Apr 2014 14:38:04 +0200

Hi,

emacs -Q
(defvar foo nil) C-M-x
M-x find-variable RET foo RET

This gives the following error:

Search failed: "Vfoo
"

Since foo is defined interactively in the *scratch* buffer emacs does
not know what file it belongs to.  That is expected.  I just think it
should say something like "Don't know where foo is defined" instead of
the above error message.

Same thing on todays bzr trunk (GNU Emacs 24.4.50.1 (i686-pc-linux-gnu,
GTK+ Version 3.8.6) of 2014-04-12 on goblin).

Regards,

/Johan




In GNU Emacs 24.3.6 (i686-pc-linux-gnu, GTK+ Version 3.8.6)
 of 2014-04-06 on goblin
Windowing system distributor `The X.Org Foundation', version 11.0.11405000
System Description:	Ubuntu 13.10

Configured using:
 `configure '--prefix=/home/jcl/usr' '--without-toolkit-scroll-bars'
 '-C' '--without-compress-info''

Important settings:
  value of $LC_COLLATE: C
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Term

Minor modes in effect:
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  diff-auto-refine-mode: t
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Recent input:
e m <tab> SPC - Q <return> <up> <return> C-h n q <up> 
<return> <switch-frame> q C-n C-n C-n C-n C-n C-n C-n 
C-n C-n C-n C-n C-n C-n <return> / o <return> <home> 
C-s f i n d - v a r <up> <up> <home> C-s s e a r c 
h C-s C-s C-s <left> SPC N P q C-h i d m <backspace> 
e m a <tab> C-g m e l i <tab> <return> i r e p o <tab> 
<backspace> <backspace> <backspace> C-g d , e d m e 
n a <tab> <backspace> <backspace> m a <tab> <return> 
i r e p o <tab> r t <tab> i n g <tab> <return> <tab> 
<return> C-h C-p <next> <home> C-s s e a r c h - f 
<up> <M-next> <next> <prior> <home> <tab> <tab> M-x 
l i s t y - <backspace> <backspace> - p a c <tab> <return> 
C-s d e b b <left> i U x SPC <up> <switch-frame> C-h 
i <C-tab> M-x d e b b u g <tab> g n u - e <backspace> 
s e <tab> r a <tab> <backspace> <backspace> a r <tab> 
<return> s e a r c h - f a i l e d <return> <return> 
M-1 C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n <return> 
SPC n n q C-h m M-x <up> <return> f i n d - v a r i 
a b l e <return> <return> q <next> <prior> <up> <up> 
<up> <tab> <return> q C-h i l l <next> <next> <next> 
<next> <next> <next> <next> <next> <home> <end> <prior> 
<home> <end> <prior> <next> <home> C-1 C-1 e m a c 
s SPC - Q <S-return> M-x r e p o r t - e m <tab> b 
<tab> <return>

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help-mode holidays hol-loaddefs icalendar diary-lib diary-loaddefs
cal-menu calendar cal-loaddefs dired-x gnus-msg gnus-art mm-uu mml2015
epg-config mm-view mml-smime smime dig gnus-sum nnoo gnus-group
gnus-undo nnmail mail-source gnus-start gnus-spec gnus-int gnus-range
gnus-win mailcap starttls smtpmail sendmail message rfc822 mml mml-sec
mm-decode mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045
ietf-drums mailabbrev gmm-utils mailheader gnus gnus-ems nnheader
mail-utils jcl-keys-init diff-mode easy-mmode tagbag tramp tramp-compat
tramp-loaddefs cl-macs gv shell pcomplete format-spec windmove jcl-keys
jcl-global-init wc-mode time paren mic-paren printing ps-print ps-def
lpr uniquify mb-depth whitespace ffap url-parse auth-source eieio
gnus-util mm-util mail-prsvr password-cache url-vars byte-opt warnings
bytecomp byte-compile cconv saveplace jcl-imenu which-func imenu
jcl-copyright jcl-duff clearcase tq reporter cl minibuf-eldef winner
icomplete jcl-sl-init w3m browse-url doc-view jka-compr image-mode
timezone w3m-hist w3m-fb bookmark-w3m w3m-ems wid-edit w3m-ccl ccl
w3m-favicon w3m-image w3m-proc w3m-util jcl-misc jcl-ert ispell
thingatpt find-lisp comint ansi-color dired jcl-misc-lexical jcl-windows
ido ert find-func ewoc debug jcl-compile jcl-site-start jpt-mode
erlang-start jcl-elpa-init num3-mode jcl-compat-init term disp-table
ehelp electric ring sh-script smie executable jcl-times-init advice
help-fns advice-preload jcl-util jcl-times cl-lib server jcl-load-path
adjust-parens-autoloads ascii-art-to-unicode-autoloads async-autoloads
auctex-autoloads tex-site auto-complete-autoloads butler-autoloads
deferred-autoloads dired-details-autoloads eimp-autoloads
el-mock-autoloads emms-autoloads epresent-autoloads erlang-autoloads
etags-select-autoloads flymake-autoloads fuzzy-match-autoloads
gitconfig-mode-autoloads gitignore-mode-autoloads gnugo-autoloads
gnuplot-autoloads gnuplot-mode-autoloads haskell-mode-autoloads edmacro
kmacro htmlize-autoloads inf-ruby-autoloads ipython-autoloads
key-chord-autoloads keywiz-autoloads lib-requires-autoloads
lua-mode-autoloads macrostep-autoloads magit-autoloads
git-rebase-mode-autoloads git-commit-mode-autoloads
markdown-mode-autoloads mic-paren-autoloads mo-git-blame-autoloads
muse-autoloads nrepl-autoloads dash-autoloads clojure-mode-autoloads
num3-mode-autoloads org-present-autoloads org-autoloads outorg-autoloads
pkg-info-autoloads epl-autoloads popup-autoloads pysmell-autoloads
python-autoloads s-autoloads slime-autoloads finder-inf tabbar-autoloads
w3m-autoloads info easymenu web-autoloads yaoddmuse-autoloads package
time-date tooltip ediff-hook vc-hooks lisp-float-type mwheel x-win x-dnd
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lisp-mode register page menu-bar rfn-eshadow timer select scroll-bar
mouse jit-lock font-lock syntax facemenu font-core frame cham georgian
utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
japanese hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese case-table epa-hook jka-cmpr-hook help simple abbrev
minibuffer loaddefs button faces cus-face macroexp files text-properties
overlay sha1 md5 base64 format env code-pages mule custom widget
hashtable-print-readable backquote make-network-process dbusbind
dynamic-setting system-font-setting font-render-setting move-toolbar gtk
x-toolkit x multi-tty emacs)

Message #8 received at 17250 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Johan Claesson <johanclaesson <at> bredband.net>
Cc: 17250 <at> debbugs.gnu.org
Subject: Re: bug#17250: 24.3; find-variable gives search-failed error message
Date: Wed, 18 Apr 2018 00:58:39 +0200

Johan Claesson <johanclaesson <at> bredband.net> writes:

> emacs -Q
> (defvar foo nil) C-M-x
> M-x find-variable RET foo RET
>
> This gives the following error:
>
> Search failed: "Vfoo
> "
>
> Since foo is defined interactively in the *scratch* buffer emacs does
> not know what file it belongs to.  That is expected.  I just think it
> should say something like "Don't know where foo is defined" instead of
> the above error message.

The following patch fixes the problem.

Simplest test case:  (help-C-file-name 'foo 'var)

But there are several places that use this function without checking the
return value.  Are they relying on this function to bug out with a
cryptic error, or are they all confident that the file name can be
found?

So I haven't applied it yet.  Perhaps somebody else will weigh in...

diff --git a/lisp/help-fns.el b/lisp/help-fns.el
index ec46a479ed..ab3fe3a732 100644
--- a/lisp/help-fns.el
+++ b/lisp/help-fns.el
@@ -169,7 +169,8 @@ describe-function
 ;;;###autoload
 (defun help-C-file-name (subr-or-var kind)
   "Return the name of the C file where SUBR-OR-VAR is defined.
-KIND should be `var' for a variable or `subr' for a subroutine."
+KIND should be `var' for a variable or `subr' for a subroutine.
+If we can't find the file name, nil is returned."
   (let ((docbuf (get-buffer-create " *DOC*"))
 	(name (if (eq 'var kind)
 		  (concat "V" (symbol-name subr-or-var))
@@ -181,19 +182,23 @@ help-C-file-name
 	   (expand-file-name internal-doc-file-name doc-directory)))
       (let ((file (catch 'loop
 		    (while t
-		      (let ((pnt (search-forward (concat "\^_" name "\n"))))
-			(re-search-backward "\^_S\\(.*\\)")
-			(let ((file (match-string 1)))
-			  (if (member file build-files)
-			      (throw 'loop file)
-			    (goto-char pnt))))))))
-	(if (string-match "^ns.*\\(\\.o\\|obj\\)\\'" file)
-	    (setq file (replace-match ".m" t t file 1))
-	  (if (string-match "\\.\\(o\\|obj\\)\\'" file)
-	      (setq file (replace-match ".c" t t file))))
-	(if (string-match "\\.\\(c\\|m\\)\\'" file)
-	    (concat "src/" file)
-	  file)))))
+		      (let ((pnt (search-forward (concat "\^_" name "\n") nil t)))
+                        (if (not pnt)
+                            (throw 'loop nil)
+			  (re-search-backward "\^_S\\(.*\\)")
+			  (let ((file (match-string 1)))
+			    (if (member file build-files)
+			        (throw 'loop file)
+			      (goto-char pnt)))))))))
+        (if (not file)
+            nil
+	  (if (string-match "^ns.*\\(\\.o\\|obj\\)\\'" file)
+	      (setq file (replace-match ".m" t t file 1))
+	    (if (string-match "\\.\\(o\\|obj\\)\\'" file)
+	        (setq file (replace-match ".c" t t file))))
+	  (if (string-match "\\.\\(c\\|m\\)\\'" file)
+	      (concat "src/" file)
+	    file))))))
 
 (defcustom help-downcase-arguments nil
   "If non-nil, argument names in *Help* buffers are downcased."


-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #15 received at 17250 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 17250 <at> debbugs.gnu.org, johanclaesson <at> bredband.net
Subject: Re: bug#17250: 24.3; find-variable gives search-failed error message
Date: Wed, 18 Apr 2018 09:23:40 +0300

> From: Lars Ingebrigtsen <larsi <at> gnus.org>
> Date: Wed, 18 Apr 2018 00:58:39 +0200
> Cc: 17250 <at> debbugs.gnu.org
> 
> But there are several places that use this function without checking the
> return value.  Are they relying on this function to bug out with a
> cryptic error, or are they all confident that the file name can be
> found?
> 
> So I haven't applied it yet.  Perhaps somebody else will weigh in...

I'm not weighing in ;-)

>  (defun help-C-file-name (subr-or-var kind)
>    "Return the name of the C file where SUBR-OR-VAR is defined.
> -KIND should be `var' for a variable or `subr' for a subroutine."
> +KIND should be `var' for a variable or `subr' for a subroutine.
> +If we can't find the file name, nil is returned."
                                   ^^^^^^^^^^^^^^^
"return nil".  We try to avoid passive tense.

Message #18 received at 17250 <at> debbugs.gnu.org (full text, mbox):

From: Noam Postavsky <npostavs <at> gmail.com>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 17250 <at> debbugs.gnu.org, Johan Claesson <johanclaesson <at> bredband.net>
Subject: Re: bug#17250: 24.3; find-variable gives search-failed error message
Date: Fri, 27 Apr 2018 22:27:25 -0400

Lars Ingebrigtsen <larsi <at> gnus.org> writes:

> But there are several places that use this function without checking the
> return value.  Are they relying on this function to bug out with a
> cryptic error, or are they all confident that the file name can be
> found?
>
> So I haven't applied it yet.  Perhaps somebody else will weigh in...

I think it's okay.  Here's my analysis of the call-sites found by M-x
rgrep:

./help-fns.el:163:;; (defun help-C-file-name (subr-or-var kind)
./help-fns.el:170:(defun help-C-file-name (subr-or-var kind)
./help-fns.el:319:	  (help-C-file-name type 'subr)
./help-fns.el:325:	  (help-C-file-name object 'var)

These 2 are in the return value position of
`find-lisp-object-file-name', whose docstring says "If no suitable file
is found, return nil".

./emacs-lisp/find-func.el:436:            (help-C-file-name def 'subr))

This one is only called if `def' satisfies `subrp', so I think failing
to find it can't happen anyway.  

./emacs-lisp/find-func.el:555:                       (help-C-file-name variable 'var))))

This one is in find-variable-noselect.  Before your change, it would
throw (search-failed "\037Vfoo\n"), with your change it throws (error
"Don’t know where ‘foo’ is defined") which seems better.

./progmodes/elisp-mode.el:693:              (push (elisp--xref-make-xref nil symbol (help-C-file-name (symbol-function symbol) 'subr)) xrefs))
./progmodes/elisp-mode.el:770:              ;; yet; help-C-file-name does that.  Second call will
./progmodes/elisp-mode.el:772:              (push (elisp--xref-make-xref 'defvar symbol (help-C-file-name symbol 'var)) xrefs))
./ldefs-boot.el:15592:(autoload 'help-C-file-name "help-fns" "\
./help-mode.el:203:                             (help-C-file-name (indirect-function fun) 'fun)))
./help-mode.el:243:		     (setq file (help-C-file-name var 'var)))

As far as I can tell, all of these calls only happen if the symbol has
already been found by `find-lisp-object-file-name', so they won't
trigger the failure case.

Message #21 received at 17250 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Noam Postavsky <npostavs <at> gmail.com>
Cc: 17250 <at> debbugs.gnu.org, Johan Claesson <johanclaesson <at> bredband.net>
Subject: Re: bug#17250: 24.3; find-variable gives search-failed error message
Date: Wed, 26 Jun 2019 16:06:22 +0200

Noam Postavsky <npostavs <at> gmail.com> writes:

>> So I haven't applied it yet.  Perhaps somebody else will weigh in...
>
> I think it's okay.  Here's my analysis of the call-sites found by M-x
> rgrep:

Thanks for checking this; I've now applied the patch to the Emacs trunk.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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