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267 lines
8.1 KiB
Plaintext
267 lines
8.1 KiB
Plaintext
# emacs-buffer.gdb --- gdb macros for recovering buffers from emacs coredumps
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# Copyright (C) 2005-2015 Free Software Foundation, Inc.
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# Maintainer: Noah Friedman <friedman@splode.com>
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# Created: 2005-04-28
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# This file is part of GNU Emacs.
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# GNU Emacs is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# GNU Emacs is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
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# Commentary:
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# This is a set of gdb macros for recovering the contents of buffers from
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# an Emacs coredump; they may not always be file-backed or have a recent
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# autosave.
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#
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# The Emacs executable must have debugging symbols for this to work.
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# But you never strip Emacs, right?
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#
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# The main commands of interest are `ybuffer-list', `yfile-buffers',
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# `ysave-buffer', and `ybuffer-contents'. The `y' prefix avoids any
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# namespace collisions with emacs/src/.gdbinit.
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# Since the internal data structures in Emacs occasionally from time to
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# time, you should use the version of this file that came with your
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# particular Emacs version; older versions might not work anymore.
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# Example usage:
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#
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# $ gdb /export/src/emacs/2005-05-02--03-17/src/emacs core.emacs.6.9845
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# Current directory is /u/noah/
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# GNU gdb (6.1post-1.20040607.43rh)
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# ...
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# #0 0x400007a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
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# (gdb) source emacs-buffer.gdb
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# (gdb) ybuffer-list
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# B# M Size Name Mode File
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# -- - ---- ---- ---- ----
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# 0 * 556 mail to emacs-devel@gnu.org Mail
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# 1 * 0 *Minibuf-1* Fundamental
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# 2 145769 ChangeLog Change Log /u/noah/lib/elisp/noahf/ChangeLog
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# 3 6619 ascii-table.el Elisp /u/noah/lib/elisp/noahf/ascii-table.el
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# 4 * 48396 *Messages* Fundamental
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# 5 3191 *Apropos* Apropos
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# 6 17642 init-21.el Elisp /u/noah/etc/init/emacs/init-21.el
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# 7 333 cpuid.c C /u/noah/cpuid.c
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# 8 230 src Dired
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# 9 218 noah Dired
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# 10 * 21 *Echo Area 0* Fundamental
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# 11 * 0 *Echo Area 1* Fundamental
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# 12 319952 *bbdb data* Text /u/noah/.bbdb
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# (gdb) ysave-buffer 0 mail.save
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# [Wrote buffer "mail to emacs-devel@gnu.org" to file mail.save]
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# (gdb) quit
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# $ ls -l mail.save
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# -rw-rw-rw- 1 noah user 556 May 2 04:05 mail.save
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# $
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# Code:
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# Force loading of symbols, enough to give us VALMASK etc.
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set main
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# When nonzero, display some extra diagnostics in various commands
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set $yverbose = 1
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set $yfile_buffers_only = 0
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define ygetptr
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set $ptr = $arg0
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set $ptr = (CHECK_LISP_OBJECT_TYPE ? $ptr.i : $ptr) & VALMASK
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end
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define ybuffer-list
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set $files_only = $yfile_buffers_only
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set $yfile_buffers_only = 0
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if $yverbose
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printf "B# M Size Name Mode File\n"
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printf "-- - ---- ---- ---- ----\n"
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end
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set $i = 0
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set $alist = Vbuffer_alist
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while $alist != Qnil
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ygetptr $alist
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set $this = ((struct Lisp_Cons *) $ptr)->car
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set $alist = ((struct Lisp_Cons *) $ptr)->u.cdr
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# Vbuffer_alist elts are pairs of the form (name . buffer)
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ygetptr $this
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set $buf = ((struct Lisp_Cons *) $ptr)->u.cdr
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ygetptr $buf
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set $buf = (struct buffer *) $ptr
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if ! ($files_only && $buf->filename_ == Qnil)
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ygetptr $buf->name_
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set $name = ((struct Lisp_String *) $ptr)->data
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set $modp = ($buf->text->modiff > $buf->text->save_modiff) ? '*' : ' '
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ygetptr $buf->mode_name_
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set $mode = ((struct Lisp_String *) $ptr)->data
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if $buf->filename_ != Qnil
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ygetptr $buf->filename_
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printf "%2d %c %9d %-20s %-10s %s\n", \
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$i, $modp, ($buf->text->z_byte - 1), $name, $mode, \
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((struct Lisp_String *) $ptr)->data
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else
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printf "%2d %c %9d %-20s %-10s\n", \
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$i, $modp, ($buf->text->z_byte - 1), $name, $mode
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end
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end
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set $i++
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end
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end
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document ybuffer-list
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Display a list of buffer names, sizes, and other attributes.
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The buffer number in the first column is used as an argument
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to some other emacs-buffer recovery commands, e.g. `ysave-buffer'.
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end
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define yfile-buffers
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set $yfile_buffers_only = 1
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ybuffer-list
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end
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document yfile-buffers
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Display a list of buffers which are associated with files.
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This is like `ybuffer-list', but only buffers that were visiting files
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are displayed.
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end
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define yset-buffer
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set $i = $arg0
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set $alist = Vbuffer_alist
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while ($alist != Qnil && $i > 0)
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ygetptr $alist
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set $alist = ((struct Lisp_Cons *) $ptr)->u.cdr
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set $i--
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end
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# Get car of alist; this is a pair (name . buffer)
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ygetptr $alist
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set $this = ((struct Lisp_Cons *) $ptr)->car
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# Get the buffer object
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ygetptr $this
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set $this = ((struct Lisp_Cons *) $ptr)->u.cdr
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ygetptr $this
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set $ycurrent_buffer = (struct buffer *) $ptr
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end
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document yset-buffer
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Set current buffer (for other emacs-buffer recovery commands) to the ARG'th
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buffer as displayed by `ybuffer-list'.
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end
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define yget-buffer-pointers
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yset-buffer $arg0
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set $buf = $ycurrent_buffer->text
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set $beg = $buf->beg
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set $gap = $beg + $buf->gpt_byte
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set $gap_end = $gap + $buf->gap_size - 1
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set $end = $gap_end + ($buf->z_byte - $buf->gpt_byte)
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set $modp = $buf->modiff > $buf->save_modiff
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#print *$beg@($gap - $beg)
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#print *$gap_end@($end - $gap_end)
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end
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document yget-buffer-pointers
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Update convenience variables with address pointers for the ARG'th buffer
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as displayed by `ybuffer-list'.
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This also sets the current buffer using `yset-buffer' (which see).
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end
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define yget-current-buffer-name
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set $this = $ycurrent_buffer->name_
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ygetptr $this
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set $ycurrent_buffer_name = ((struct Lisp_String *) $ptr)->data
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end
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document yget-current-buffer-name
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Set $ycurrent_buffer_name to the name of the currently selected buffer.
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end
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define ycurrent-buffer
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yget-current-buffer-name
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printf "%s\n", $ycurrent_buffer_name
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end
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document ycurrent-buffer
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Display the currently selected buffer.
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end
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define ydump-buffer
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yget-buffer-pointers $arg0
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if $buf->z_byte > 1
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if $buf->z_byte <= $buf->gpt_byte
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set $endptr = $beg + $buf->gpt_byte - 1
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dump binary memory $arg1 $beg $endptr
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else
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dump binary memory $arg1 $beg $gap-1
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append binary memory $arg1 $gap_end $end
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set $endptr = $end
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end
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end
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end
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document ydump-buffer
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Write contents of buffer N (as numbered according to `ybuffer-list') to
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file FILE.
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This is mainly used as an internal subroutine for `ysave-buffer' and
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`ybuffer-contents', which see.
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end
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define ysave-buffer
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ydump-buffer $arg0 $arg1
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if $yverbose
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yget-current-buffer-name
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if $buf->z_byte <= 1
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printf "[Buffer \"%s\" is empty.]\n", $ycurrent_buffer_name
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else
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# Output string broken into separate calls as necessary to avoid
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# requiring a running process for evaluation.
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printf "[Wrote buffer \"%s\" to file ", $ycurrent_buffer_name
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echo $arg1]\n
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end
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end
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end
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document ysave-buffer
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Save contents of buffer N (as numbered according to `ybuffer-list') to
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file FILE.
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end
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define ybuffer-contents
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ydump-buffer $arg0 /dev/stdout
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if $yverbose && $buf->z_byte <= 1
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yget-current-buffer-name
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printf "[Buffer \"%s\" is empty.]\n", $ycurrent_buffer_name
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else
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if *($endptr-1) != '\n'
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echo \n
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end
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end
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end
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document ybuffer-contents
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Write contents of buffer N (numbered according to `ybuffer-list') to stdout.
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end
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# local variables:
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# mode: gdb-script
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# end:
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