GNU logs - #26824, boring messages

Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#26824: 24.5; Bytecode overflow error when byte compiling large .el file
Resent-From: Christian Wittern <cwittern@HIDDEN>
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Resent-Date: Mon, 08 May 2017 07:04:01 +0000
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To: 26824 <at> debbugs.gnu.org
From: Christian Wittern <cwittern@HIDDEN>
Message-ID: <ccd2065c-0a98-5edf-7150-543d97df3f83@HIDDEN>
Date: Mon, 8 May 2017 16:03:23 +0900
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--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...

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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
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hides /Users/chris/projects/mandoku/lisp/mandoku-dict
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/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 
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Subject: bug#26824: 24.5; Bytecode overflow error when byte compiling large .el file
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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

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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

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[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.

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Christian Wittern <cwittern@HIDDEN> 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.

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On 05/16/2017 09:24 AM, Michael Heerdegen wrote:
> Christian Wittern <cwittern@HIDDEN> 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

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Christian Wittern <cwittern@HIDDEN> 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.

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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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