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1 | /* Process record and replay target for GDB, the GNU debugger. | |
2 | ||
3 | Copyright (C) 2008-2013 Free Software Foundation, Inc. | |
4 | ||
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include "defs.h" | |
21 | #include "gdbcmd.h" | |
22 | #include "completer.h" | |
23 | #include "record.h" | |
24 | #include "observer.h" | |
25 | #include "inferior.h" | |
26 | #include "common/common-utils.h" | |
27 | ||
28 | /* This is the debug switch for process record. */ | |
29 | unsigned int record_debug = 0; | |
30 | ||
31 | struct cmd_list_element *record_cmdlist = NULL; | |
32 | struct cmd_list_element *set_record_cmdlist = NULL; | |
33 | struct cmd_list_element *show_record_cmdlist = NULL; | |
34 | struct cmd_list_element *info_record_cmdlist = NULL; | |
35 | ||
36 | #define DEBUG(msg, args...) \ | |
37 | if (record_debug) \ | |
38 | fprintf_unfiltered (gdb_stdlog, "record: " msg "\n", ##args) | |
39 | ||
40 | /* Find the record target in the target stack. */ | |
41 | ||
42 | static struct target_ops * | |
43 | find_record_target (void) | |
44 | { | |
45 | struct target_ops *t; | |
46 | ||
47 | for (t = current_target.beneath; t != NULL; t = t->beneath) | |
48 | if (t->to_stratum == record_stratum) | |
49 | return t; | |
50 | ||
51 | return NULL; | |
52 | } | |
53 | ||
54 | /* Check that recording is active. Throw an error, if it isn't. */ | |
55 | ||
56 | static struct target_ops * | |
57 | require_record_target (void) | |
58 | { | |
59 | struct target_ops *t; | |
60 | ||
61 | t = find_record_target (); | |
62 | if (t == NULL) | |
63 | error (_("No record target is currently active.\n" | |
64 | "Use one of the \"target record-<tab><tab>\" commands first.")); | |
65 | ||
66 | return t; | |
67 | } | |
68 | ||
69 | /* See record.h. */ | |
70 | ||
71 | int | |
72 | record_read_memory (struct gdbarch *gdbarch, | |
73 | CORE_ADDR memaddr, gdb_byte *myaddr, | |
74 | ssize_t len) | |
75 | { | |
76 | int ret = target_read_memory (memaddr, myaddr, len); | |
77 | ||
78 | if (ret != 0) | |
79 | DEBUG ("error reading memory at addr %s len = %ld.\n", | |
80 | paddress (gdbarch, memaddr), (long) len); | |
81 | ||
82 | return ret; | |
83 | } | |
84 | ||
85 | /* Stop recording. */ | |
86 | ||
87 | static void | |
88 | record_stop (struct target_ops *t) | |
89 | { | |
90 | DEBUG ("stop %s", t->to_shortname); | |
91 | ||
92 | if (t->to_stop_recording != NULL) | |
93 | t->to_stop_recording (); | |
94 | } | |
95 | ||
96 | /* Unpush the record target. */ | |
97 | ||
98 | static void | |
99 | record_unpush (struct target_ops *t) | |
100 | { | |
101 | DEBUG ("unpush %s", t->to_shortname); | |
102 | ||
103 | unpush_target (t); | |
104 | } | |
105 | ||
106 | /* See record.h. */ | |
107 | ||
108 | void | |
109 | record_disconnect (struct target_ops *t, char *args, int from_tty) | |
110 | { | |
111 | gdb_assert (t->to_stratum == record_stratum); | |
112 | ||
113 | DEBUG ("disconnect %s", t->to_shortname); | |
114 | ||
115 | record_stop (t); | |
116 | record_unpush (t); | |
117 | ||
118 | target_disconnect (args, from_tty); | |
119 | } | |
120 | ||
121 | /* See record.h. */ | |
122 | ||
123 | void | |
124 | record_detach (struct target_ops *t, char *args, int from_tty) | |
125 | { | |
126 | gdb_assert (t->to_stratum == record_stratum); | |
127 | ||
128 | DEBUG ("detach %s", t->to_shortname); | |
129 | ||
130 | record_stop (t); | |
131 | record_unpush (t); | |
132 | ||
133 | target_detach (args, from_tty); | |
134 | } | |
135 | ||
136 | /* See record.h. */ | |
137 | ||
138 | void | |
139 | record_mourn_inferior (struct target_ops *t) | |
140 | { | |
141 | gdb_assert (t->to_stratum == record_stratum); | |
142 | ||
143 | DEBUG ("mourn inferior %s", t->to_shortname); | |
144 | ||
145 | /* It is safer to not stop recording. Resources will be freed when | |
146 | threads are discarded. */ | |
147 | record_unpush (t); | |
148 | ||
149 | target_mourn_inferior (); | |
150 | } | |
151 | ||
152 | /* See record.h. */ | |
153 | ||
154 | void | |
155 | record_kill (struct target_ops *t) | |
156 | { | |
157 | gdb_assert (t->to_stratum == record_stratum); | |
158 | ||
159 | DEBUG ("kill %s", t->to_shortname); | |
160 | ||
161 | /* It is safer to not stop recording. Resources will be freed when | |
162 | threads are discarded. */ | |
163 | record_unpush (t); | |
164 | ||
165 | target_kill (); | |
166 | } | |
167 | ||
168 | /* Implement "show record debug" command. */ | |
169 | ||
170 | static void | |
171 | show_record_debug (struct ui_file *file, int from_tty, | |
172 | struct cmd_list_element *c, const char *value) | |
173 | { | |
174 | fprintf_filtered (file, _("Debugging of process record target is %s.\n"), | |
175 | value); | |
176 | } | |
177 | ||
178 | /* Alias for "target record". */ | |
179 | ||
180 | static void | |
181 | cmd_record_start (char *args, int from_tty) | |
182 | { | |
183 | execute_command ("target record-full", from_tty); | |
184 | } | |
185 | ||
186 | /* Truncate the record log from the present point | |
187 | of replay until the end. */ | |
188 | ||
189 | static void | |
190 | cmd_record_delete (char *args, int from_tty) | |
191 | { | |
192 | require_record_target (); | |
193 | ||
194 | if (!target_record_is_replaying ()) | |
195 | { | |
196 | printf_unfiltered (_("Already at end of record list.\n")); | |
197 | return; | |
198 | } | |
199 | ||
200 | if (!target_supports_delete_record ()) | |
201 | { | |
202 | printf_unfiltered (_("The current record target does not support " | |
203 | "this operation.\n")); | |
204 | return; | |
205 | } | |
206 | ||
207 | if (!from_tty || query (_("Delete the log from this point forward " | |
208 | "and begin to record the running message " | |
209 | "at current PC?"))) | |
210 | target_delete_record (); | |
211 | } | |
212 | ||
213 | /* Implement the "stoprecord" or "record stop" command. */ | |
214 | ||
215 | static void | |
216 | cmd_record_stop (char *args, int from_tty) | |
217 | { | |
218 | struct target_ops *t; | |
219 | ||
220 | t = require_record_target (); | |
221 | ||
222 | record_stop (t); | |
223 | record_unpush (t); | |
224 | ||
225 | printf_unfiltered (_("Process record is stopped and all execution " | |
226 | "logs are deleted.\n")); | |
227 | ||
228 | observer_notify_record_changed (current_inferior (), 0); | |
229 | } | |
230 | ||
231 | /* The "set record" command. */ | |
232 | ||
233 | static void | |
234 | set_record_command (char *args, int from_tty) | |
235 | { | |
236 | printf_unfiltered (_("\"set record\" must be followed " | |
237 | "by an apporpriate subcommand.\n")); | |
238 | help_list (set_record_cmdlist, "set record ", all_commands, gdb_stdout); | |
239 | } | |
240 | ||
241 | /* The "show record" command. */ | |
242 | ||
243 | static void | |
244 | show_record_command (char *args, int from_tty) | |
245 | { | |
246 | cmd_show_list (show_record_cmdlist, from_tty, ""); | |
247 | } | |
248 | ||
249 | /* The "info record" command. */ | |
250 | ||
251 | static void | |
252 | info_record_command (char *args, int from_tty) | |
253 | { | |
254 | struct target_ops *t; | |
255 | ||
256 | t = find_record_target (); | |
257 | if (t == NULL) | |
258 | { | |
259 | printf_filtered (_("No record target is currently active.\n")); | |
260 | return; | |
261 | } | |
262 | ||
263 | printf_filtered (_("Active record target: %s\n"), t->to_shortname); | |
264 | if (t->to_info_record != NULL) | |
265 | t->to_info_record (); | |
266 | } | |
267 | ||
268 | /* The "record save" command. */ | |
269 | ||
270 | static void | |
271 | cmd_record_save (char *args, int from_tty) | |
272 | { | |
273 | char *recfilename, recfilename_buffer[40]; | |
274 | ||
275 | require_record_target (); | |
276 | ||
277 | if (args != NULL && *args != 0) | |
278 | recfilename = args; | |
279 | else | |
280 | { | |
281 | /* Default recfile name is "gdb_record.PID". */ | |
282 | xsnprintf (recfilename_buffer, sizeof (recfilename_buffer), | |
283 | "gdb_record.%d", PIDGET (inferior_ptid)); | |
284 | recfilename = recfilename_buffer; | |
285 | } | |
286 | ||
287 | target_save_record (recfilename); | |
288 | } | |
289 | ||
290 | /* "record goto" command. Argument is an instruction number, | |
291 | as given by "info record". | |
292 | ||
293 | Rewinds the recording (forward or backward) to the given instruction. */ | |
294 | ||
295 | void | |
296 | cmd_record_goto (char *arg, int from_tty) | |
297 | { | |
298 | require_record_target (); | |
299 | ||
300 | if (arg == NULL || *arg == '\0') | |
301 | error (_("Command requires an argument (insn number to go to).")); | |
302 | ||
303 | if (strncmp (arg, "start", strlen ("start")) == 0 | |
304 | || strncmp (arg, "begin", strlen ("begin")) == 0) | |
305 | target_goto_record_begin (); | |
306 | else if (strncmp (arg, "end", strlen ("end")) == 0) | |
307 | target_goto_record_end (); | |
308 | else | |
309 | { | |
310 | ULONGEST insn; | |
311 | ||
312 | insn = parse_and_eval_long (arg); | |
313 | target_goto_record (insn); | |
314 | } | |
315 | } | |
316 | ||
317 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
318 | extern initialize_file_ftype _initialize_record; | |
319 | ||
320 | void | |
321 | _initialize_record (void) | |
322 | { | |
323 | struct cmd_list_element *c; | |
324 | ||
325 | add_setshow_zuinteger_cmd ("record", no_class, &record_debug, | |
326 | _("Set debugging of record/replay feature."), | |
327 | _("Show debugging of record/replay feature."), | |
328 | _("When enabled, debugging output for " | |
329 | "record/replay feature is displayed."), | |
330 | NULL, show_record_debug, &setdebuglist, | |
331 | &showdebuglist); | |
332 | ||
333 | c = add_prefix_cmd ("record", class_obscure, cmd_record_start, | |
334 | _("Start recording."), | |
335 | &record_cmdlist, "record ", 0, &cmdlist); | |
336 | set_cmd_completer (c, filename_completer); | |
337 | ||
338 | add_com_alias ("rec", "record", class_obscure, 1); | |
339 | add_prefix_cmd ("record", class_support, set_record_command, | |
340 | _("Set record options"), &set_record_cmdlist, | |
341 | "set record ", 0, &setlist); | |
342 | add_alias_cmd ("rec", "record", class_obscure, 1, &setlist); | |
343 | add_prefix_cmd ("record", class_support, show_record_command, | |
344 | _("Show record options"), &show_record_cmdlist, | |
345 | "show record ", 0, &showlist); | |
346 | add_alias_cmd ("rec", "record", class_obscure, 1, &showlist); | |
347 | add_prefix_cmd ("record", class_support, info_record_command, | |
348 | _("Info record options"), &info_record_cmdlist, | |
349 | "info record ", 0, &infolist); | |
350 | add_alias_cmd ("rec", "record", class_obscure, 1, &infolist); | |
351 | ||
352 | c = add_cmd ("save", class_obscure, cmd_record_save, | |
353 | _("Save the execution log to a file.\n\ | |
354 | Argument is optional filename.\n\ | |
355 | Default filename is 'gdb_record.<process_id>'."), | |
356 | &record_cmdlist); | |
357 | set_cmd_completer (c, filename_completer); | |
358 | ||
359 | add_cmd ("delete", class_obscure, cmd_record_delete, | |
360 | _("Delete the rest of execution log and start recording it anew."), | |
361 | &record_cmdlist); | |
362 | add_alias_cmd ("d", "delete", class_obscure, 1, &record_cmdlist); | |
363 | add_alias_cmd ("del", "delete", class_obscure, 1, &record_cmdlist); | |
364 | ||
365 | add_cmd ("stop", class_obscure, cmd_record_stop, | |
366 | _("Stop the record/replay target."), | |
367 | &record_cmdlist); | |
368 | add_alias_cmd ("s", "stop", class_obscure, 1, &record_cmdlist); | |
369 | ||
370 | add_cmd ("goto", class_obscure, cmd_record_goto, _("\ | |
371 | Restore the program to its state at instruction number N.\n\ | |
372 | Argument is instruction number, as shown by 'info record'."), | |
373 | &record_cmdlist); | |
374 | } |