GNU bug report logs - #26824
24.5; Bytecode overflow error when byte compiling large .el file

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

From: Christian Wittern <cwittern <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.5; Bytecode overflow error when byte compiling large .el file
Date: Mon, 8 May 2017 16:03:23 +0900

--text follows this line--

I installed the package "mandoku" from melpa.  The latest version
includes a file "mandoku-cbeta.el".  When installing the package, this
file should be compiled, but the overflow error prevents this.



In GNU Emacs 24.5.1 (x86_64-pc-linux-gnu, GTK+ Version 3.18.9)
 of 2016-04-18 on lgw01-04, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.11804000
System Description:    Ubuntu 16.04.2 LTS

Configured using:
 `configure --build x86_64-linux-gnu --prefix=/usr
 --sharedstatedir=/var/lib --libexecdir=/usr/lib
 --localstatedir=/var/lib --infodir=/usr/share/info
 --mandir=/usr/share/man --with-pop=yes
 --enable-locallisppath=/etc/emacs24:/etc/emacs:/usr/local/share/emacs/24.5/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.5/site-lisp:/usr/share/emacs/site-lisp
 --build x86_64-linux-gnu --prefix=/usr --sharedstatedir=/var/lib
 --libexecdir=/usr/lib --localstatedir=/var/lib
 --infodir=/usr/share/info --mandir=/usr/share/man --with-pop=yes
 --enable-locallisppath=/etc/emacs24:/etc/emacs:/usr/local/share/emacs/24.5/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.5/site-lisp:/usr/share/emacs/site-lisp
 --with-x=yes --with-x-toolkit=gtk3 --with-toolkit-scroll-bars
 'CFLAGS=-g -O2 -fstack-protector-strong -Wformat
 -Werror=format-security -Wall' 'CPPFLAGS=-Wdate-time
 -D_FORTIFY_SOURCE=2' 'LDFLAGS=-Wl,-Bsymbolic-functions -Wl,-z,relro''

Important settings:
  value of $LC_MONETARY: en_US.UTF-8
  value of $LC_NUMERIC: en_US.UTF-8
  value of $LC_TIME: en_US.UTF-8
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Compilation

Minor modes in effect:
  diff-auto-refine-mode: t
  magit-auto-revert-mode: t
  global-git-commit-mode: t
  async-bytecomp-package-mode: t
  shell-dirtrack-mode: t
  override-global-mode: t
  tooltip-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
  buffer-read-only: t
  line-number-mode: t
  transient-mark-mode: t

Recent messages:
Generating autoloads for helm-types.el...done
Generating autoloads for helm-utils.el...done
Saving file 
/home/chris/sinomacs/.emacs.d/elpa/helm-20170506.840/helm-autoloads.el...
Wrote /home/chris/sinomacs/.emacs.d/elpa/helm-20170506.840/helm-autoloads.el
(No changes need to be saved)
Loading async...done
Turning on magit-auto-revert-mode...done
For information about GNU Emacs and the GNU system, type C-h C-a.
M-o <down> is undefined
Making completion list...

Load-path shadows:
/home/chris/sinomacs/.emacs.d/elpa/mandoku-20170325.1917/mandoku-remote 
hides /Users/chris/projects/mandoku/lisp/mandoku-remote
/home/chris/sinomacs/.emacs.d/elpa/mandoku-20170325.1917/mandoku-init 
hides /Users/chris/projects/mandoku/lisp/mandoku-init
/home/chris/sinomacs/.emacs.d/elpa/mandoku-20170325.1917/mandoku-cbeta 
hides /Users/chris/projects/mandoku/lisp/mandoku-cbeta
/home/chris/sinomacs/.emacs.d/elpa/mandoku-20170325.1917/mandoku-github 
hides /Users/chris/projects/mandoku/lisp/mandoku-github
/home/chris/sinomacs/.emacs.d/elpa/mandoku-20170325.1917/mandoku-dict 
hides /Users/chris/projects/mandoku/lisp/mandoku-dict
/home/chris/sinomacs/.emacs.d/elpa/mandoku-20170325.1917/w32-registry 
hides /Users/chris/projects/mandoku/lisp/w32-registry
/home/chris/sinomacs/.emacs.d/elpa/mandoku-20170325.1917/mandoku hides 
/Users/chris/projects/mandoku/lisp/mandoku
/home/chris/sinomacs/.emacs.d/elpa/mandoku-20170325.1917/mandoku-images 
hides /Users/chris/projects/mandoku/lisp/mandoku-images
/home/chris/sinomacs/.emacs.d/elpa/mandoku-20170325.1917/mandoku-annot 
hides /Users/chris/projects/mandoku/lisp/mandoku-annot
/home/chris/sinomacs/.emacs.d/elpa/mandoku-20170325.1917/mandoku-link 
hides /Users/chris/projects/mandoku/lisp/mandoku-link
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/home/chris/sinomacs/.emacs.d/elpa/org-20170502/ob-gnuplot hides 
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cal-loaddefs hydra advice lv tar-mode use-package pcase diminish
bind-key easy-mmode cl-macs cl gv compile comint ansi-color ring
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mail-utils network-stream starttls url-http tls mail-parse rfc2231
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gnus-util mm-util help-fns mail-prsvr password-cache url-vars epg
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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 nadvice loaddefs button faces cus-face macroexp files
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custom widget hashtable-print-readable backquote make-network-process
dbusbind gfilenotify dynamic-setting system-font-setting
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Memory information:
((conses 16 513183 92848)
 (symbols 48 58119 0)
 (miscs 40 137 454)
 (strings 32 136298 56305)
 (string-bytes 1 4215697)
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 (intervals 56 7512 72)
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Message #8 received at 26824 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: Christian Wittern <cwittern <at> gmail.com>
Cc: 26824 <at> debbugs.gnu.org
Subject: Re: bug#26824: 24.5;
 Bytecode overflow error when byte compiling large .el file
Date: Mon, 08 May 2017 12:40:10 -0400

Christian Wittern wrote:

> I installed the package "mandoku" from melpa.  The latest version
> includes a file "mandoku-cbeta.el".  When installing the package, this
> file should be compiled, but the overflow error prevents this.

I see that file basically contains a 16000 line nested cond, with one
branch per line, and has now been marked no-byte-compile (by you, I'm
guessing from the name?).

https://github.com/mandoku/mandoku/commit/0e733fdaea77150539455656c2e6af08d19611b0

Message #11 received at 26824 <at> debbugs.gnu.org (full text, mbox):

From: Christian Wittern <cwittern <at> gmail.com>
To: Glenn Morris <rgm <at> gnu.org>, 26824 <at> debbugs.gnu.org
Subject: Re: bug#26824: 24.5; Bytecode overflow error when byte compiling
 large .el file
Date: Tue, 9 May 2017 07:46:57 +0900

On 05/09/2017 01:40 AM, Glenn Morris wrote:
> Christian Wittern wrote:
>
>> I installed the package "mandoku" from melpa.  The latest version
>> includes a file "mandoku-cbeta.el".  When installing the package, this
>> file should be compiled, but the overflow error prevents this.
> I see that file basically contains a 16000 line nested cond, with one
> branch per line, and has now been marked no-byte-compile (by you, I'm
> guessing from the name?).
>
> https://github.com/mandoku/mandoku/commit/0e733fdaea77150539455656c2e6af08d19611b0
>
Yes, that is right.  This file is a bit of a crazy thing, if there is a 
better way to achieve this, I would be glad to know.  And I did mark it 
as no-byte-compile, but it seems that this has no effect, since when 
installed as a package the installer still attempts to byte compile it.
All the best,
Christian

Message #14 received at 26824 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: Christian Wittern <cwittern <at> gmail.com>
Cc: 26824 <at> debbugs.gnu.org
Subject: Re: bug#26824: 24.5;
 Bytecode overflow error when byte compiling large .el file
Date: Sun, 14 May 2017 20:49:09 -0400

[Please reply-to-all]

Christian Wittern wrote:

> Yes, that is right.  This file is a bit of a crazy thing, if there is
> a better way to achieve this, I would be glad to know.  And I did mark
> it as no-byte-compile, but it seems that this has no effect, since
> when installed as a package the installer still attempts to byte
> compile it.

Probably because the no-byte-compile is in the second line, not the first.

Message #17 received at 26824 <at> debbugs.gnu.org (full text, mbox):

From: Michael Heerdegen <michael_heerdegen <at> web.de>
To: Christian Wittern <cwittern <at> gmail.com>
Cc: Glenn Morris <rgm <at> gnu.org>, 26824 <at> debbugs.gnu.org
Subject: Re: bug#26824: 24.5;
 Bytecode overflow error when byte compiling large .el file
Date: Tue, 16 May 2017 02:24:07 +0200

Christian Wittern <cwittern <at> gmail.com> writes:

> Yes, that is right.  This file is a bit of a crazy thing, if there is
> a better way to achieve this, I would be glad to know.

Use a data structure.

In the simplest case (when lookup time is not critical), just use a
linear structure, an alist: For each VOL, define an alist with elements
(pagelimit . filename) with `defconst'.  To implement
`mandoku-cbeta-vol-page-to-file', find the first entry whose car is not
smaller than the given page in a loop.  Return the cdr of the found
cons.


Michael.

Message #20 received at 26824 <at> debbugs.gnu.org (full text, mbox):

From: Christian Wittern <cwittern <at> gmail.com>
To: Michael Heerdegen <michael_heerdegen <at> web.de>
Cc: Glenn Morris <rgm <at> gnu.org>, 26824 <at> debbugs.gnu.org
Subject: Re: bug#26824: 24.5; Bytecode overflow error when byte compiling
 large .el file
Date: Tue, 16 May 2017 11:08:24 +0900

On 05/16/2017 09:24 AM, Michael Heerdegen wrote:
> Christian Wittern <cwittern <at> gmail.com> writes:
>
>> Yes, that is right.  This file is a bit of a crazy thing, if there is
>> a better way to achieve this, I would be glad to know.
> Use a data structure.
>
> In the simplest case (when lookup time is not critical), just use a
> linear structure, an alist: For each VOL, define an alist with elements
> (pagelimit . filename) with `defconst'.  To implement
> `mandoku-cbeta-vol-page-to-file', find the first entry whose car is not
> smaller than the given page in a loop.  Return the cdr of the found
> cons.
Well, yes.  But I expect the timing then to be slower (although I did 
not really test this), because I would have to go sequentially through 
the alist, so I went with this inelegant method, which at least 
responses fast, even without bytecompiling.

Christian

Message #23 received at 26824 <at> debbugs.gnu.org (full text, mbox):

From: npostavs <at> users.sourceforge.net
To: Christian Wittern <cwittern <at> gmail.com>
Cc: Michael Heerdegen <michael_heerdegen <at> web.de>, Glenn Morris <rgm <at> gnu.org>,
 26824 <at> debbugs.gnu.org
Subject: Re: bug#26824: 24.5;
 Bytecode overflow error when byte compiling large .el file
Date: Mon, 15 May 2017 23:16:38 -0400

Christian Wittern <cwittern <at> gmail.com> writes:

> Well, yes.  But I expect the timing then to be slower (although I did
> not really test this), because I would have to go sequentially through
> the alist, so I went with this inelegant method, which at least
> responses fast, even without bytecompiling.

You just need to make nested alists, as in

    '(("T" . ((1 . ((0011102 . "KR6a0001_001.txt")
                    (0011102 . "KR6a0001_001.txt")
                    (0016212 . "KR6a0001_002.txt")
                    (0016212 . "KR6a0001_002.txt")
                    (0023303 . "KR6a0001_003.txt")
                    (0023303 . "KR6a0001_003.txt")
                    (0030206 . "KR6a0001_004.txt"))))))

The `cond' form tests each case in sequence, so it should be about the
same speed as an cl-assoc-if lookup.

Message #26 received at 26824 <at> debbugs.gnu.org (full text, mbox):

From: npostavs <at> users.sourceforge.net
To: Glenn Morris <rgm <at> gnu.org>
Cc: Christian Wittern <cwittern <at> gmail.com>, 26824 <at> debbugs.gnu.org
Subject: Re: bug#26824: 24.5;
 Bytecode overflow error when byte compiling large .el file
Date: Mon, 15 May 2017 23:21:59 -0400

I see the code triggering this has a FIXME on it:

      ;; FIXME: Replace this by some workaround.
      (if (> (car bytes-tail) 255) (error "Bytecode overflow"))

What workarounds could we use?  Introduce a new jump opcode with a 4
byte operand?  Or daisy chain a bunch of relative jumps?  Both of these
seem a bit extreme for a pretty rare edge case.

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