GNU bug report logs -
#23061
25.0.92; Docs of ARGLIST in byte-code function objects is outdated
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Reported by: Eli Zaretskii <eliz <at> gnu.org>
Date: Sat, 19 Mar 2016 13:59:01 UTC
Severity: minor
Found in version 25.0.92
Done: Eli Zaretskii <eliz <at> gnu.org>
Bug is archived. No further changes may be made.
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[Message part 1 (text/plain, inline)]
Your bug report
#23061: 25.0.92; Docs of ARGLIST in byte-code function objects is outdated
which was filed against the emacs package, has been closed.
The explanation is attached below, along with your original report.
If you require more details, please reply to 23061 <at> debbugs.gnu.org.
--
23061: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=23061
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems
[Message part 2 (message/rfc822, inline)]
> Date: Sat, 19 Mar 2016 15:58:05 +0200
> From: Eli Zaretskii <eliz <at> gnu.org>
> Cc: Stefan Monnier <monnier <at> iro.umontreal.ca>
>
> (symbol-function 'backward-sexp)
> => #[256 "\211\204^G^@\300\262^A\301^A[!\207" [1 forward-sexp] 3 1793299 "^p"]
>
> IOW, instead of the argument list you have a number 256. Neither the
> fact that it can be (and usually is) a number nor the ways to
> interpret that number are documented anywhere I could see.
>
> It looks like the information about this can be found in
> byte-compile-make-args-desc and help-function-arglist.
>
> The change which introduced this feature was done 5 years ago, so it's
> high time we had it documented.
Fixed.
[Message part 3 (message/rfc822, inline)]
The node "Byte-Code Objects" says:
Internally, a byte-code function object is much like a vector; its
elements can be accessed using ‘aref’. Its printed representation is
like that for a vector, with an additional ‘#’ before the opening ‘[’.
It must have at least four elements; there is no maximum number, but
only the first six elements have any normal use. They are:
ARGLIST
The list of argument symbols.
BYTE-CODE
The string containing the byte-code instructions.
...
and gives this example:
Here’s an example of a byte-code function object, in printed
representation. It is the definition of the command ‘backward-sexp’.
#[(&optional arg)
"^H\204^F^@\301^P\302^H[!\207"
[arg 1 forward-sexp]
2
254435
"^p"]
However, if you actually try this example, you get a different result:
(symbol-function 'backward-sexp)
=> #[256 "\211\204^G^@\300\262^A\301^A[!\207" [1 forward-sexp] 3 1793299 "^p"]
IOW, instead of the argument list you have a number 256. Neither the
fact that it can be (and usually is) a number nor the ways to
interpret that number are documented anywhere I could see.
It looks like the information about this can be found in
byte-compile-make-args-desc and help-function-arglist.
The change which introduced this feature was done 5 years ago, so it's
high time we had it documented.
In GNU Emacs 25.0.92.36 (i686-pc-mingw32)
of 2016-03-19 built on HOME-C4E4A596F7
Repository revision: 26f9c5075ff273013418a66b70fae477301d41d5
Windowing system distributor 'Microsoft Corp.', version 5.1.2600
Configured using:
'configure --prefix=/d/usr --enable-checking=yes,glyphs --with-wide-int
--with-modules 'CFLAGS=-O0 -gdwarf-4 -g3''
Configured features:
XPM JPEG TIFF GIF PNG RSVG SOUND NOTIFY ACL GNUTLS LIBXML2 ZLIB
TOOLKIT_SCROLL_BARS MODULES
Important settings:
value of $LANG: ENU
locale-coding-system: cp1255
Major mode: Lisp Interaction
Minor modes in effect:
diff-auto-refine-mode: t
tooltip-mode: t
global-eldoc-mode: t
electric-indent-mode: t
mouse-wheel-mode: t
tool-bar-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
line-number-mode: t
transient-mark-mode: t
Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Type C-x 1 to delete the help window.
Making completion list...
Load-path shadows:
None found.
Features:
(shadow sort mail-extr emacsbug message dired format-spec rfc822 mml
mml-sec password-cache epg epg-config gnus-util mm-decode mm-bodies
mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail
rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils dabbrev vc
vc-dispatcher vc-git diff-mode easy-mmode find-func cl-extra thingatpt
help-fns help-mode easymenu cl-loaddefs pcase cl-lib time-date mule-util
tooltip eldoc electric uniquify ediff-hook vc-hooks lisp-float-type
mwheel dos-w32 ls-lisp disp-table w32-win w32-vars term/common-win
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 w32notify w32 multi-tty
make-network-process emacs)
Memory information:
((conses 16 101168 7624)
(symbols 56 21418 0)
(miscs 48 46 181)
(strings 16 20509 5825)
(string-bytes 1 519374)
(vectors 16 13539)
(vector-slots 8 440543 4313)
(floats 8 173 473)
(intervals 40 633 215)
(buffers 856 14))
This bug report was last modified 9 years and 112 days ago.
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