GNU bug report logs - #45342
28.0.50; Native compiled function returns raw bytes, not string

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

From: Alexander Miller <alexanderm <at> web.de>
To: bug-gnu-emacs <at> gnu.org
Subject: 28.0.50; Native compiled function returns raw bytes, not string
Date: Sun, 20 Dec 2020 18:36:46 +0100

In my config I have the following function that is used to prettify my
mode-line (the actual version is pure and side-effect-free and inlined,
but that does not seem to have any effect here):

(defun f (n)
  (pcase n
    (1 " ➊") (2 " ➋") (3 " ➌") (4 " ➍") (5 " ➎") (6 " ➏")
    (7 " ➐") (8 " ➑") (9 " ➒") (10 " ➓") (_ "")))

When native compiled it appears to return raw bytes instead of the
unicode symbols, for example I am seeing \342\236\212 instead of ➊.

I can circumvent that by using (1 (decode-coding-string " ➊" 'utf-8)),
but of course that should not be necessary, since there's no such
problem with the byte-compiled version.

And on a probably unrelated note: is it normal for such a simple
function to be compiled to 100 LOC of assembly? That seems surprisingly
to my amateur eyes.

In GNU Emacs 28.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version
3.24.23, cairo version 1.17.3)
of 2020-12-20 built on am-laptop
Repository revision: ab985f41db5fdaeada513d28a065332fd8838cf4
Repository branch: makepkg
Windowing system distributor 'The X.Org Foundation', version 11.0.12008000
System Description: Manjaro Linux

Configured using:
'configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib
--localstatedir=/var --mandir=/usr/share/man --with-gameuser=:games
--with-sound=alsa --with-modules --without-gconf --without-gsettings
--with-nativecomp --with-x-toolkit=gtk3 --without-xaw3d
--without-m17n-flt --with-cairo --without-compress-install
'CFLAGS=-march=x86-64 -mtune=generic -O2 -pipe -fno-plt -g
-fuse-ld=gold' CPPFLAGS=-D_FORTIFY_SOURCE=2
LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now'

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Message #8 received at 45342 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Alexander Miller <alexanderm <at> web.de>
Cc: 45342 <at> debbugs.gnu.org
Subject: Re: bug#45342: 28.0.50;
 Native compiled function returns raw bytes, not string
Date: Sun, 20 Dec 2020 19:56:02 +0200

> From: Alexander Miller <alexanderm <at> web.de>
> Date: Sun, 20 Dec 2020 18:36:46 +0100
> 
> In my config I have the following function that is used to prettify my
> mode-line (the actual version is pure and side-effect-free and inlined,
> but that does not seem to have any effect here):
> 
> (defun f (n)
>    (pcase n
>      (1 " ➊") (2 " ➋") (3 " ➌") (4 " ➍") (5 " ➎") (6 " ➏")
>      (7 " ➐") (8 " ➑") (9 " ➒") (10 " ➓") (_ "")))
> 
> When native compiled it appears to return raw bytes instead of the
> unicode symbols, for example I am seeing \342\236\212 instead of ➊.

\342\236\212 is the UTF-8 encoding of ➊.  Which probably means the
native-compiled function returns a unibyte string instead of a
multibyte string, for some reason.

Message #11 received at 45342 <at> debbugs.gnu.org (full text, mbox):

From: Andrea Corallo <akrl <at> sdf.org>
To: Alexander Miller <alexanderm <at> web.de>
Cc: 45342 <at> debbugs.gnu.org
Subject: Re: bug#45342: 28.0.50; Native compiled function returns raw bytes,
 not string
Date: Sun, 20 Dec 2020 20:24:30 +0000

Alexander Miller <alexanderm <at> web.de> writes:

> In my config I have the following function that is used to prettify my
> mode-line (the actual version is pure and side-effect-free and inlined,
> but that does not seem to have any effect here):
>
> (defun f (n)
>   (pcase n
>     (1 " ➊") (2 " ➋") (3 " ➌") (4 " ➍") (5 " ➎") (6 " ➏")
>     (7 " ➐") (8 " ➑") (9 " ➒") (10 " ➓") (_ "")))
>
> When native compiled it appears to return raw bytes instead of the
> unicode symbols, for example I am seeing \342\236\212 instead of ➊.
>
> I can circumvent that by using (1 (decode-coding-string " ➊" 'utf-8)),
> but of course that should not be necessary, since there's no such
> problem with the byte-compiled version.

Hi Alexander,

72c1a41573 fix this for me, would you like to confirm?

> And on a probably unrelated note: is it normal for such a simple
> function to be compiled to 100 LOC of assembly? That seems surprisingly
> to my amateur eyes.

Yes, big switch cases is ATM a case we do not generate optimal code for.

Thanks for the report!

  Andrea

Message #14 received at 45342 <at> debbugs.gnu.org (full text, mbox):

From: Alexander Miller <alexanderm <at> web.de>
To: akrl <at> sdf.org
Cc: 45342 <at> debbugs.gnu.org
Subject: Re: bug#45342: 28.0.50; Native compiled function returns raw bytes,
 not string
Date: Mon, 21 Dec 2020 14:45:04 +0100

Hi Andrea,

I can confirm that 72c1a41573 fixes the issue.

However there's still another problem that I thought was related, but
apparently it isn't. (I can open another bug for it if you like).

It looks like eval-when-compile is not working as expected. I am also
using small xpms for my modeline that are defined like this:

(defconst selected-window-xpm
   (eval-when-compile (doom-modeline--make-xpm 'modeline-xpm-face 5 30)))

The generating code looks like this:

(defun doom-modeline--make-xpm (face width height)
  "Create an XPM bitmap via FACE, WIDTH and HEIGHT. Inspired by 
`powerline''s `pl/make-xpm'."
  (when (and (display-graphic-p)
             (image-type-available-p 'xpm))
    (propertize
     " " 'display
     (let ((data (make-list height (make-list width 1)))
           (color (or (face-background face nil t) "None")))
       (ignore-errors
         (create-image
          (concat
           (format
            "/* XPM */\nstatic char * percent[] = {\n\"%i %i 2 
1\",\n\". c %s\",\n\"  c %s\","
            (length (car data)) (length data) color color)
           (apply #'concat
                  (cl-loop with idx = 0
                           with len = (length data)
                           for dl in data
                           do (cl-incf idx)
                           collect
                           (concat
                            "\""
                            (cl-loop for d in dl
                                     if (= d 0) collect (string-to-char 
" ")
                                     else collect (string-to-char "."))
                            (if (eq idx len) "\"};" "\",\n")))))
  'xpm t :ascent 'center))))))

When native-compiling I only get nil, with byte-compiling it works
without problems. The correct value should look like this:

#(" " 0 1
(display
(image :type xpm :data "/* XPM */
static char * percent[] = {
\"5 30 2 1\",
\". c #559955\",
\" c #559955\",\".....\",
\".....\",
\".....\",
\".....\",
\".....\",
\".....\",
\".....\",
\".....\",
\".....\",
\".....\",
\".....\",
\".....\",
\".....\",
\".....\",
\".....\",
\".....\",
\".....\",
\".....\",
\".....\",
\".....\",
\".....\",
\".....\",
\".....\",
\".....\",
\".....\",
\".....\",
\".....\",
\".....\",
\".....\",
\".....\"};" :scale 1 :ascent center)))

Message #19 received at 45342-done <at> debbugs.gnu.org (full text, mbox):

From: Andrea Corallo <akrl <at> sdf.org>
To: Alexander Miller <alexanderm <at> web.de>
Cc: 45342-done <at> debbugs.gnu.org
Subject: Re: bug#45342: 28.0.50; Native compiled function returns raw bytes,
 not string
Date: Mon, 21 Dec 2020 15:34:05 +0000

Alexander Miller <alexanderm <at> web.de> writes:

> Hi Andrea,
>
> I can confirm that 72c1a41573 fixes the issue.
>
> However there's still another problem that I thought was related, but
> apparently it isn't. (I can open another bug for it if you like).
>
> It looks like eval-when-compile is not working as expected. I am also
> using small xpms for my modeline that are defined like this:

Hi Alex,

I tried reproducing but I get nil both executing interpreted byte-compiled
and native-compiled, so probably I'm not doing exactly what you do.

Could you open a dedicated bug attaching the full reproducer and how you
exercise it?

I'm closing this one.

Thanks!

  Andrea

Message #22 received at 45342 <at> debbugs.gnu.org (full text, mbox):

From: Alexander Miller <alexanderm <at> web.de>
To: 45342 <at> debbugs.gnu.org
Subject: Re: bug#45342: closed (Re: bug#45342: 28.0.50; Native compiled
 function returns raw bytes, not string)
Date: Mon, 21 Dec 2020 20:36:47 +0100

Hi Andrea,

never mind about the second thing, the function is guarded by a
(and (display-graphic-p) (image-type-available-p 'xpm)) check. I compile
my config in a batch script, so getting nil here is the correct
behaviour.
That does open up the question why it does work with byte-compilation,
but that's probably not a bug, just something I need to figure out.

Message #25 received at 45342 <at> debbugs.gnu.org (full text, mbox):

From: Andrea Corallo <akrl <at> sdf.org>
To: Alexander Miller <alexanderm <at> web.de>
Cc: 45342 <at> debbugs.gnu.org
Subject: Re: bug#45342: closed (Re: bug#45342: 28.0.50; Native compiled
 function returns raw bytes, not string)
Date: Mon, 21 Dec 2020 20:01:18 +0000

Alexander Miller <alexanderm <at> web.de> writes:

> Hi Andrea,
>
> never mind about the second thing, the function is guarded by a
> (and (display-graphic-p) (image-type-available-p 'xpm)) check. I compile
> my config in a batch script, so getting nil here is the correct
> behaviour.
> That does open up the question why it does work with byte-compilation,
> but that's probably not a bug, just something I need to figure out.

Hi Alexander,

okay, you know where to complain in case :)

  Andrea

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