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1 | # emacs-buffer.gdb --- gdb macros for recovering buffers from emacs coredumps |
2 | ||
3 | # Copyright (C) 2005 Free Software Foundation, Inc. | |
4 | ||
5 | # Maintainer: Noah Friedman <friedman@splode.com> | |
6 | # Status: tested with Emacs 22 | |
7 | # Created: 2005-04-28 | |
8 | ||
a7868bfa NF |
9 | # This file is part of GNU Emacs. |
10 | # | |
11 | # GNU Emacs is free software; you can redistribute it and/or modify | |
12 | # it under the terms of the GNU General Public License as published by | |
13 | # the Free Software Foundation; either version 2, or (at your option) | |
14 | # any later version. | |
15 | # | |
16 | # GNU Emacs is distributed in the hope that it will be useful, | |
17 | # but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | # GNU General Public License for more details. | |
20 | # | |
21 | # You should have received a copy of the GNU General Public License | |
22 | # along with GNU Emacs; see the file COPYING. If not, write to the | |
23 | # Free Software Foundation, Inc.; 51 Franklin Street, Fifth Floor; | |
24 | # Boston, MA 02110-1301, USA. | |
25 | ||
26 | # Commentary: | |
27 | ||
28 | # This is a set of gdb macros for recovering the contents of buffers from | |
29 | # an Emacs coredump; they may not always be file-backed or have a recent | |
30 | # autosave. | |
31 | # | |
32 | # The Emacs executable must have debugging symbols for this to work. But | |
33 | # you never strip Emacs, right? Right! | |
34 | # | |
35 | # The main commands of interest are `ybuffer-list', `yfile-buffers', | |
36 | # `ysave-buffer', and `ybuffer-contents'. The `y' prefix avoids any | |
37 | # namespace collisions with emacs/src/.gdbinit. | |
38 | ||
39 | # Example usage: | |
40 | # | |
41 | # $ gdb /export/src/emacs/2005-05-02--03-17/src/emacs core.emacs.6.9845 | |
42 | # Current directory is /u/noah/ | |
43 | # GNU gdb (6.1post-1.20040607.43rh) | |
44 | # ... | |
45 | # #0 0x400007a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2 | |
46 | # (gdb) source emacs-buffer.gdb | |
47 | # (gdb) ybuffer-list | |
48 | # B# M Size Name Mode File | |
49 | # -- - ---- ---- ---- ---- | |
50 | # 0 * 556 mail to emacs-devel@gnu.org Mail | |
51 | # 1 * 0 *Minibuf-1* Fundamental | |
52 | # 2 145769 ChangeLog Change Log /u/noah/lib/elisp/noahf/ChangeLog | |
53 | # 3 6619 ascii-table.el Elisp /u/noah/lib/elisp/noahf/ascii-table.el | |
54 | # 4 * 48396 *Messages* Fundamental | |
55 | # 5 3191 *Apropos* Apropos | |
56 | # 6 17642 init-21.el Elisp /u/noah/etc/init/emacs/init-21.el | |
57 | # 7 333 cpuid.c C /u/noah/cpuid.c | |
58 | # 8 230 src Dired | |
59 | # 9 218 noah Dired | |
60 | # 10 * 21 *Echo Area 0* Fundamental | |
61 | # 11 * 0 *Echo Area 1* Fundamental | |
62 | # 12 319952 *bbdb data* Text /u/noah/.bbdb | |
63 | # (gdb) ysave-buffer 0 mail.save | |
64 | # [Wrote buffer "mail to emacs-devel@gnu.org" to file mail.save] | |
65 | # (gdb) quit | |
66 | # $ ls -l mail.save | |
67 | # -rw-rw-rw- 1 noah user 556 May 2 04:05 mail.save | |
68 | # $ | |
69 | ||
70 | # Code: | |
71 | ||
72 | # Force loading of symbols, enough to give us gdb_valbits etc. | |
73 | set main | |
74 | ||
75 | # When nonzero, display some extra diagnostics in various commands | |
76 | set $yverbose = 1 | |
77 | set $yfile_buffers_only = 0 | |
78 | ||
79 | set $tagmask = (((long)1 << gdb_gctypebits) - 1) | |
80 | set $valmask = gdb_use_lsb ? ~($tagmask) : ((long)1 << gdb_valbits) - 1 | |
81 | ||
82 | define ygetptr | |
83 | set $ptr = $arg0 | |
84 | set $ptr = (gdb_use_union ? $ptr.u.val : $ptr & $valmask) | gdb_data_seg_bits | |
85 | end | |
86 | ||
87 | define ybuffer-list | |
88 | set $files_only = $yfile_buffers_only | |
89 | set $yfile_buffers_only = 0 | |
90 | ||
91 | if $yverbose | |
92 | printf "B# M Size Name Mode File\n" | |
93 | printf "-- - ---- ---- ---- ----\n" | |
94 | end | |
95 | ||
96 | set $i = 0 | |
97 | set $alist = Vbuffer_alist | |
98 | while $alist != Qnil | |
99 | ygetptr $alist | |
100 | set $this = ((struct Lisp_Cons *) $ptr)->car | |
101 | set $alist = ((struct Lisp_Cons *) $ptr)->cdr | |
102 | ||
103 | # Vbuffer_alist elts are pairs of the form (name . buffer) | |
104 | ygetptr $this | |
105 | set $buf = ((struct Lisp_Cons *) $ptr)->cdr | |
106 | ygetptr $buf | |
107 | set $buf = (struct buffer *) $ptr | |
108 | ||
109 | if ! ($files_only && $buf->filename == Qnil) | |
110 | ygetptr $buf->name | |
111 | set $name = ((struct Lisp_String *) $ptr)->data | |
112 | set $modp = ($buf->text->modiff > $buf->text->save_modiff) ? '*' : ' ' | |
113 | ||
114 | ygetptr $buf->mode_name | |
115 | set $mode = ((struct Lisp_String *) $ptr)->data | |
116 | ||
117 | if $buf->filename != Qnil | |
118 | ygetptr $buf->filename | |
58f498fe NF |
119 | printf "%2d %c %9d %-20s %-10s %s\n", \ |
120 | $i, $modp, ($buf->text->z_byte - 1), $name, $mode, \ | |
121 | ((struct Lisp_String *) $ptr)->data | |
a7868bfa | 122 | else |
58f498fe NF |
123 | printf "%2d %c %9d %-20s %-10s\n", \ |
124 | $i, $modp, ($buf->text->z_byte - 1), $name, $mode | |
a7868bfa | 125 | end |
a7868bfa NF |
126 | end |
127 | ||
128 | set $i++ | |
129 | end | |
130 | end | |
131 | document ybuffer-list | |
132 | Display a list of buffer names, sizes, and other attributes. | |
133 | The buffer number in the first column is used as an argument | |
134 | to some other emacs-buffer recovery commands, e.g. `ysave-buffer'. | |
135 | end | |
136 | ||
137 | define yfile-buffers | |
138 | set $yfile_buffers_only = 1 | |
139 | ybuffer-list | |
140 | end | |
141 | document yfile-buffers | |
142 | Display a list of buffers which are associated with files. | |
143 | This is like `ybuffer-list', but only buffers that were visiting files | |
144 | are displayed. | |
145 | end | |
146 | ||
147 | define yset-buffer | |
148 | set $i = $arg0 | |
149 | ||
150 | set $alist = Vbuffer_alist | |
151 | while ($alist != Qnil && $i > 0) | |
152 | ygetptr $alist | |
153 | set $alist = ((struct Lisp_Cons *) $ptr)->cdr | |
154 | set $i-- | |
155 | end | |
156 | ||
157 | # Get car of alist; this is a pair (name . buffer) | |
158 | ygetptr $alist | |
159 | set $this = ((struct Lisp_Cons *) $ptr)->car | |
160 | ||
161 | # Get the buffer object | |
162 | ygetptr $this | |
163 | set $this = ((struct Lisp_Cons *) $ptr)->cdr | |
164 | ||
165 | ygetptr $this | |
166 | set $ycurrent_buffer = (struct buffer *) $ptr | |
167 | end | |
168 | document yset-buffer | |
169 | Set current buffer (for other emacs-buffer recovery commands) to the ARG'th | |
170 | buffer as displayed by `ybuffer-list'. | |
171 | end | |
172 | ||
173 | define yget-buffer-pointers | |
174 | yset-buffer $arg0 | |
175 | set $buf = $ycurrent_buffer->text | |
176 | ||
177 | set $beg = $buf->beg | |
178 | set $gap = $beg + $buf->gpt_byte | |
179 | set $gap_end = $gap + $buf->gap_size - 1 | |
180 | set $end = $gap_end + ($buf->z_byte - $buf->gpt_byte) | |
181 | ||
182 | set $modp = $buf->modiff > $buf->save_modiff | |
183 | ||
184 | #print *$beg@($gap - $beg) | |
185 | #print *$gap_end@($end - $gap_end) | |
186 | end | |
187 | document yget-buffer-pointers | |
188 | Update convenience variables with address pointers for the ARG'th buffer | |
189 | as displayed by `ybuffer-list'. | |
190 | ||
191 | This also sets the current buffer using `yset-buffer' (which see). | |
192 | end | |
193 | ||
194 | define yget-current-buffer-name | |
195 | set $this = $ycurrent_buffer->name | |
196 | ygetptr $this | |
197 | set $ycurrent_buffer_name = ((struct Lisp_String *) $ptr)->data | |
198 | end | |
199 | document yget-current-buffer-name | |
200 | Set $ycurrent_buffer_name to the name of the currently selected buffer. | |
201 | end | |
202 | ||
203 | define ycurrent-buffer | |
204 | yget-current-buffer-name | |
205 | printf "%s\n", $ycurrent_buffer_name | |
206 | end | |
207 | document ycurrent-buffer | |
208 | Display the currently selected buffer. | |
209 | end | |
210 | ||
211 | define ydump-buffer | |
212 | yget-buffer-pointers $arg0 | |
213 | if $buf->z_byte > 1 | |
214 | if $buf->z_byte <= $buf->gpt_byte | |
215 | set $endptr = $beg + $buf->gpt_byte - 1 | |
216 | dump binary memory $arg1 $beg $endptr | |
217 | else | |
218 | dump binary memory $arg1 $beg $gap-1 | |
219 | append binary memory $arg1 $gap_end $end | |
220 | set $endptr = $end | |
221 | end | |
222 | end | |
223 | end | |
224 | document ydump-buffer | |
225 | Write contents of buffer N (as numbered according to `ybuffer-list') to | |
226 | file FILE. | |
227 | ||
228 | This is mainly used as an internal subroutine for `ysave-buffer' and | |
229 | `ybuffer-contents', which see. | |
230 | end | |
231 | ||
232 | define ysave-buffer | |
233 | ydump-buffer $arg0 $arg1 | |
234 | if $yverbose | |
235 | yget-current-buffer-name | |
236 | if $buf->z_byte <= 1 | |
237 | printf "[Buffer \"%s\" is empty.]\n", $ycurrent_buffer_name | |
238 | else | |
239 | # Output string broken into separate calls as necessary to avoid | |
240 | # requiring a running process for evaluation. | |
241 | printf "[Wrote buffer \"%s\" to file ", $ycurrent_buffer_name | |
242 | echo $arg1]\n | |
243 | end | |
244 | end | |
245 | end | |
246 | document ysave-buffer | |
247 | Save contents of buffer N (as numbered according to `ybuffer-list') to | |
248 | file FILE. | |
249 | end | |
250 | ||
251 | define ybuffer-contents | |
252 | ydump-buffer $arg0 /dev/stdout | |
253 | if $yverbose && $buf->z_byte <= 1 | |
254 | yget-current-buffer-name | |
255 | printf "[Buffer \"%s\" is empty.]\n", $ycurrent_buffer_name | |
256 | else | |
257 | if *($endptr-1) != '\n' | |
258 | echo \n | |
259 | end | |
260 | end | |
261 | end | |
262 | document ybuffer-contents | |
263 | Write contents of buffer N (numbered according to `ybuffer-list') to stdout. | |
264 | end | |
265 | ||
266 | # local variables: | |
267 | # mode: gdb-script | |
268 | # end: | |
22b58b5e MB |
269 | |
270 | # arch-tag: 02087f62-2663-4868-977a-1fbb2fc2e7ef |