1 /* Process record and replay target for GDB, the GNU debugger.
3 Copyright (C) 2008-2021 Free Software Foundation, Inc.
5 This file is part of GDB.
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.
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.
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/>. */
22 #include "completer.h"
24 #include "observable.h"
26 #include "gdbsupport/common-utils.h"
27 #include "cli/cli-utils.h"
32 /* This is the debug switch for process record. */
33 unsigned int record_debug
= 0;
35 /* The number of instructions to print in "record instruction-history". */
36 static unsigned int record_insn_history_size
= 10;
38 /* The variable registered as control variable in the "record
39 instruction-history" command. Necessary for extra input
41 static unsigned int record_insn_history_size_setshow_var
;
43 /* The number of functions to print in "record function-call-history". */
44 static unsigned int record_call_history_size
= 10;
46 /* The variable registered as control variable in the "record
47 call-history" command. Necessary for extra input validation. */
48 static unsigned int record_call_history_size_setshow_var
;
50 struct cmd_list_element
*record_cmdlist
= NULL
;
51 static struct cmd_list_element
*record_goto_cmdlist
= NULL
;
52 struct cmd_list_element
*set_record_cmdlist
= NULL
;
53 struct cmd_list_element
*show_record_cmdlist
= NULL
;
54 struct cmd_list_element
*info_record_cmdlist
= NULL
;
56 #define DEBUG(msg, args...) \
58 fprintf_unfiltered (gdb_stdlog, "record: " msg "\n", ##args)
63 find_record_target (void)
65 return find_target_at (record_stratum
);
68 /* Check that recording is active. Throw an error, if it isn't. */
70 static struct target_ops
*
71 require_record_target (void)
75 t
= find_record_target ();
77 error (_("No recording is currently active.\n"
78 "Use the \"record full\" or \"record btrace\" command first."));
88 /* Check if a record target is already running. */
89 if (find_record_target () != NULL
)
90 error (_("The process is already being recorded. Use \"record stop\" to "
91 "stop recording first."));
97 record_start (const char *method
, const char *format
, int from_tty
)
102 execute_command_to_string ("record", from_tty
, false);
104 error (_("Invalid format."));
106 else if (strcmp (method
, "full") == 0)
109 execute_command_to_string ("record full", from_tty
, false);
111 error (_("Invalid format."));
113 else if (strcmp (method
, "btrace") == 0)
116 execute_command_to_string ("record btrace", from_tty
, false);
117 else if (strcmp (format
, "bts") == 0)
118 execute_command_to_string ("record btrace bts", from_tty
, false);
119 else if (strcmp (format
, "pt") == 0)
120 execute_command_to_string ("record btrace pt", from_tty
, false);
122 error (_("Invalid format."));
125 error (_("Invalid method."));
131 record_stop (int from_tty
)
133 execute_command_to_string ("record stop", from_tty
, false);
139 record_read_memory (struct gdbarch
*gdbarch
,
140 CORE_ADDR memaddr
, gdb_byte
*myaddr
,
143 int ret
= target_read_memory (memaddr
, myaddr
, len
);
146 DEBUG ("error reading memory at addr %s len = %ld.\n",
147 paddress (gdbarch
, memaddr
), (long) len
);
152 /* Stop recording. */
155 record_stop (struct target_ops
*t
)
157 DEBUG ("stop %s", t
->shortname ());
159 t
->stop_recording ();
162 /* Unpush the record target. */
165 record_unpush (struct target_ops
*t
)
167 DEBUG ("unpush %s", t
->shortname ());
169 current_inferior ()->unpush_target (t
);
175 record_disconnect (struct target_ops
*t
, const char *args
, int from_tty
)
177 gdb_assert (t
->stratum () == record_stratum
);
179 DEBUG ("disconnect %s", t
->shortname ());
184 target_disconnect (args
, from_tty
);
190 record_detach (struct target_ops
*t
, inferior
*inf
, int from_tty
)
192 gdb_assert (t
->stratum () == record_stratum
);
194 DEBUG ("detach %s", t
->shortname ());
199 target_detach (inf
, from_tty
);
205 record_mourn_inferior (struct target_ops
*t
)
207 gdb_assert (t
->stratum () == record_stratum
);
209 DEBUG ("mourn inferior %s", t
->shortname ());
211 /* It is safer to not stop recording. Resources will be freed when
212 threads are discarded. */
215 target_mourn_inferior (inferior_ptid
);
221 record_kill (struct target_ops
*t
)
223 gdb_assert (t
->stratum () == record_stratum
);
225 DEBUG ("kill %s", t
->shortname ());
227 /* It is safer to not stop recording. Resources will be freed when
228 threads are discarded. */
237 record_check_stopped_by_breakpoint (const address_space
*aspace
,
239 enum target_stop_reason
*reason
)
241 if (breakpoint_inserted_here_p (aspace
, pc
))
243 if (hardware_breakpoint_inserted_here_p (aspace
, pc
))
244 *reason
= TARGET_STOPPED_BY_HW_BREAKPOINT
;
246 *reason
= TARGET_STOPPED_BY_SW_BREAKPOINT
;
250 *reason
= TARGET_STOPPED_BY_NO_REASON
;
254 /* Implement "show record debug" command. */
257 show_record_debug (struct ui_file
*file
, int from_tty
,
258 struct cmd_list_element
*c
, const char *value
)
260 fprintf_filtered (file
, _("Debugging of process record target is %s.\n"),
264 /* Alias for "target record". */
267 cmd_record_start (const char *args
, int from_tty
)
269 execute_command ("target record-full", from_tty
);
272 /* Truncate the record log from the present point
273 of replay until the end. */
276 cmd_record_delete (const char *args
, int from_tty
)
278 require_record_target ();
280 if (!target_record_is_replaying (inferior_ptid
))
282 printf_unfiltered (_("Already at end of record list.\n"));
286 if (!target_supports_delete_record ())
288 printf_unfiltered (_("The current record target does not support "
289 "this operation.\n"));
293 if (!from_tty
|| query (_("Delete the log from this point forward "
294 "and begin to record the running message "
296 target_delete_record ();
299 /* Implement the "stoprecord" or "record stop" command. */
302 cmd_record_stop (const char *args
, int from_tty
)
304 struct target_ops
*t
;
306 t
= require_record_target ();
311 printf_unfiltered (_("Process record is stopped and all execution "
312 "logs are deleted.\n"));
314 gdb::observers::record_changed
.notify (current_inferior (), 0, NULL
, NULL
);
318 /* The "info record" command. */
321 info_record_command (const char *args
, int from_tty
)
323 struct target_ops
*t
;
325 t
= find_record_target ();
328 printf_filtered (_("No recording is currently active.\n"));
332 printf_filtered (_("Active record target: %s\n"), t
->shortname ());
336 /* The "record save" command. */
339 cmd_record_save (const char *args
, int from_tty
)
341 const char *recfilename
;
342 char recfilename_buffer
[40];
344 require_record_target ();
346 if (args
!= NULL
&& *args
!= 0)
350 /* Default recfile name is "gdb_record.PID". */
351 xsnprintf (recfilename_buffer
, sizeof (recfilename_buffer
),
352 "gdb_record.%d", inferior_ptid
.pid ());
353 recfilename
= recfilename_buffer
;
356 target_save_record (recfilename
);
362 record_goto (const char *arg
)
366 if (arg
== NULL
|| *arg
== '\0')
367 error (_("Command requires an argument (insn number to go to)."));
369 insn
= parse_and_eval_long (arg
);
371 require_record_target ();
372 target_goto_record (insn
);
375 /* "record goto" command. Argument is an instruction number,
376 as given by "info record".
378 Rewinds the recording (forward or backward) to the given instruction. */
381 cmd_record_goto (const char *arg
, int from_tty
)
386 /* The "record goto begin" command. */
389 cmd_record_goto_begin (const char *arg
, int from_tty
)
391 if (arg
!= NULL
&& *arg
!= '\0')
392 error (_("Junk after argument: %s."), arg
);
394 require_record_target ();
395 target_goto_record_begin ();
398 /* The "record goto end" command. */
401 cmd_record_goto_end (const char *arg
, int from_tty
)
403 if (arg
!= NULL
&& *arg
!= '\0')
404 error (_("Junk after argument: %s."), arg
);
406 require_record_target ();
407 target_goto_record_end ();
410 /* Read an instruction number from an argument string. */
413 get_insn_number (const char **arg
)
416 const char *begin
, *end
, *pos
;
419 pos
= skip_spaces (begin
);
422 error (_("Expected positive number, got: %s."), pos
);
424 number
= strtoulst (pos
, &end
, 10);
426 *arg
+= (end
- begin
);
431 /* Read a context size from an argument string. */
434 get_context_size (const char **arg
)
439 pos
= skip_spaces (*arg
);
442 error (_("Expected positive number, got: %s."), pos
);
444 long result
= strtol (pos
, &end
, 10);
449 /* Complain about junk at the end of an argument string. */
452 no_chunk (const char *arg
)
455 error (_("Junk after argument: %s."), arg
);
458 /* Read instruction-history modifiers from an argument string. */
460 static gdb_disassembly_flags
461 get_insn_history_modifiers (const char **arg
)
463 gdb_disassembly_flags modifiers
;
477 error (_("Missing modifier."));
479 for (; *args
; ++args
)
491 modifiers
|= DISASSEMBLY_SOURCE
;
492 modifiers
|= DISASSEMBLY_FILENAME
;
495 modifiers
|= DISASSEMBLY_RAW_INSN
;
498 modifiers
|= DISASSEMBLY_OMIT_FNAME
;
501 modifiers
|= DISASSEMBLY_OMIT_PC
;
504 error (_("Invalid modifier: %c."), *args
);
508 args
= skip_spaces (args
);
511 /* Update the argument string. */
517 /* The "set record instruction-history-size / set record
518 function-call-history-size" commands are unsigned, with UINT_MAX
519 meaning unlimited. The target interfaces works with signed int
520 though, to indicate direction, so map "unlimited" to INT_MAX, which
521 is about the same as unlimited in practice. If the user does have
522 a log that huge, she can fetch it in chunks across several requests,
523 but she'll likely have other problems first... */
526 command_size_to_target_size (unsigned int size
)
528 gdb_assert (size
<= INT_MAX
|| size
== UINT_MAX
);
530 if (size
== UINT_MAX
)
536 /* The "record instruction-history" command. */
539 cmd_record_insn_history (const char *arg
, int from_tty
)
541 require_record_target ();
543 gdb_disassembly_flags flags
= get_insn_history_modifiers (&arg
);
545 int size
= command_size_to_target_size (record_insn_history_size
);
547 if (arg
== NULL
|| *arg
== 0 || strcmp (arg
, "+") == 0)
548 target_insn_history (size
, flags
);
549 else if (strcmp (arg
, "-") == 0)
550 target_insn_history (-size
, flags
);
555 begin
= get_insn_number (&arg
);
559 arg
= skip_spaces (++arg
);
564 size
= get_context_size (&arg
);
568 target_insn_history_from (begin
, size
, flags
);
570 else if (*arg
== '-')
573 size
= get_context_size (&arg
);
577 target_insn_history_from (begin
, -size
, flags
);
581 end
= get_insn_number (&arg
);
585 target_insn_history_range (begin
, end
, flags
);
592 target_insn_history_from (begin
, size
, flags
);
599 /* Read function-call-history modifiers from an argument string. */
601 static record_print_flags
602 get_call_history_modifiers (const char **arg
)
604 record_print_flags modifiers
= 0;
605 const char *args
= *arg
;
615 error (_("Missing modifier."));
617 for (; *args
; ++args
)
628 modifiers
|= RECORD_PRINT_SRC_LINE
;
631 modifiers
|= RECORD_PRINT_INSN_RANGE
;
634 modifiers
|= RECORD_PRINT_INDENT_CALLS
;
637 error (_("Invalid modifier: %c."), *args
);
641 args
= skip_spaces (args
);
644 /* Update the argument string. */
650 /* The "record function-call-history" command. */
653 cmd_record_call_history (const char *arg
, int from_tty
)
655 require_record_target ();
657 record_print_flags flags
= get_call_history_modifiers (&arg
);
659 int size
= command_size_to_target_size (record_call_history_size
);
661 if (arg
== NULL
|| *arg
== 0 || strcmp (arg
, "+") == 0)
662 target_call_history (size
, flags
);
663 else if (strcmp (arg
, "-") == 0)
664 target_call_history (-size
, flags
);
669 begin
= get_insn_number (&arg
);
673 arg
= skip_spaces (++arg
);
678 size
= get_context_size (&arg
);
682 target_call_history_from (begin
, size
, flags
);
684 else if (*arg
== '-')
687 size
= get_context_size (&arg
);
691 target_call_history_from (begin
, -size
, flags
);
695 end
= get_insn_number (&arg
);
699 target_call_history_range (begin
, end
, flags
);
706 target_call_history_from (begin
, size
, flags
);
713 /* Helper for "set record instruction-history-size" and "set record
714 function-call-history-size" input validation. COMMAND_VAR is the
715 variable registered in the command as control variable. *SETTING
716 is the real setting the command allows changing. */
719 validate_history_size (unsigned int *command_var
, unsigned int *setting
)
721 if (*command_var
!= UINT_MAX
&& *command_var
> INT_MAX
)
723 unsigned int new_value
= *command_var
;
725 /* Restore previous value. */
726 *command_var
= *setting
;
727 error (_("integer %u out of range"), new_value
);
730 /* Commit new value. */
731 *setting
= *command_var
;
734 /* Called by do_setshow_command. We only want values in the
735 [0..INT_MAX] range, while the command's machinery accepts
736 [0..UINT_MAX]. See command_size_to_target_size. */
739 set_record_insn_history_size (const char *args
, int from_tty
,
740 struct cmd_list_element
*c
)
742 validate_history_size (&record_insn_history_size_setshow_var
,
743 &record_insn_history_size
);
746 /* Called by do_setshow_command. We only want values in the
747 [0..INT_MAX] range, while the command's machinery accepts
748 [0..UINT_MAX]. See command_size_to_target_size. */
751 set_record_call_history_size (const char *args
, int from_tty
,
752 struct cmd_list_element
*c
)
754 validate_history_size (&record_call_history_size_setshow_var
,
755 &record_call_history_size
);
758 void _initialize_record ();
760 _initialize_record ()
762 struct cmd_list_element
*c
;
764 add_setshow_zuinteger_cmd ("record", no_class
, &record_debug
,
765 _("Set debugging of record/replay feature."),
766 _("Show debugging of record/replay feature."),
767 _("When enabled, debugging output for "
768 "record/replay feature is displayed."),
769 NULL
, show_record_debug
, &setdebuglist
,
772 add_setshow_uinteger_cmd ("instruction-history-size", no_class
,
773 &record_insn_history_size_setshow_var
, _("\
774 Set number of instructions to print in \"record instruction-history\"."), _("\
775 Show number of instructions to print in \"record instruction-history\"."), _("\
776 A size of \"unlimited\" means unlimited instructions. The default is 10."),
777 set_record_insn_history_size
, NULL
,
778 &set_record_cmdlist
, &show_record_cmdlist
);
780 add_setshow_uinteger_cmd ("function-call-history-size", no_class
,
781 &record_call_history_size_setshow_var
, _("\
782 Set number of function to print in \"record function-call-history\"."), _("\
783 Show number of functions to print in \"record function-call-history\"."), _("\
784 A size of \"unlimited\" means unlimited lines. The default is 10."),
785 set_record_call_history_size
, NULL
,
786 &set_record_cmdlist
, &show_record_cmdlist
);
788 cmd_list_element
*record_cmd
789 = add_prefix_cmd ("record", class_obscure
, cmd_record_start
,
790 _("Start recording."),
791 &record_cmdlist
, 0, &cmdlist
);
792 set_cmd_completer (record_cmd
, filename_completer
);
794 add_com_alias ("rec", record_cmd
, class_obscure
, 1);
795 add_basic_prefix_cmd ("record", class_support
,
796 _("Set record options."), &set_record_cmdlist
,
798 add_alias_cmd ("rec", "record", class_obscure
, 1, &setlist
);
799 add_show_prefix_cmd ("record", class_support
,
800 _("Show record options."), &show_record_cmdlist
,
802 add_alias_cmd ("rec", "record", class_obscure
, 1, &showlist
);
803 add_prefix_cmd ("record", class_support
, info_record_command
,
804 _("Info record options."), &info_record_cmdlist
,
806 add_alias_cmd ("rec", "record", class_obscure
, 1, &infolist
);
808 c
= add_cmd ("save", class_obscure
, cmd_record_save
,
809 _("Save the execution log to a file.\n\
810 Usage: record save [FILENAME]\n\
811 Default filename is 'gdb_record.PROCESS_ID'."),
813 set_cmd_completer (c
, filename_completer
);
815 add_cmd ("delete", class_obscure
, cmd_record_delete
,
816 _("Delete the rest of execution log and start recording it anew."),
818 add_alias_cmd ("d", "delete", class_obscure
, 1, &record_cmdlist
);
819 add_alias_cmd ("del", "delete", class_obscure
, 1, &record_cmdlist
);
821 add_cmd ("stop", class_obscure
, cmd_record_stop
,
822 _("Stop the record/replay target."),
824 add_alias_cmd ("s", "stop", class_obscure
, 1, &record_cmdlist
);
826 add_prefix_cmd ("goto", class_obscure
, cmd_record_goto
, _("\
827 Restore the program to its state at instruction number N.\n\
828 Argument is instruction number, as shown by 'info record'."),
829 &record_goto_cmdlist
, 1, &record_cmdlist
);
831 add_cmd ("begin", class_obscure
, cmd_record_goto_begin
,
832 _("Go to the beginning of the execution log."),
833 &record_goto_cmdlist
);
834 add_alias_cmd ("start", "begin", class_obscure
, 1, &record_goto_cmdlist
);
836 add_cmd ("end", class_obscure
, cmd_record_goto_end
,
837 _("Go to the end of the execution log."),
838 &record_goto_cmdlist
);
840 add_cmd ("instruction-history", class_obscure
, cmd_record_insn_history
, _("\
841 Print disassembled instructions stored in the execution log.\n\
842 With a /m or /s modifier, source lines are included (if available).\n\
843 With a /r modifier, raw instructions in hex are included.\n\
844 With a /f modifier, function names are omitted.\n\
845 With a /p modifier, current position markers are omitted.\n\
846 With no argument, disassembles ten more instructions after the previous \
848 \"record instruction-history -\" disassembles ten instructions before a \
849 previous disassembly.\n\
850 One argument specifies an instruction number as shown by 'info record', and \
851 ten instructions are disassembled after that instruction.\n\
852 Two arguments with comma between them specify starting and ending instruction \
853 numbers to disassemble.\n\
854 If the second argument is preceded by '+' or '-', it specifies the distance \
855 from the first argument.\n\
856 The number of instructions to disassemble can be defined with \"set record \
857 instruction-history-size\"."),
860 add_cmd ("function-call-history", class_obscure
, cmd_record_call_history
, _("\
861 Prints the execution history at function granularity.\n\
862 It prints one line for each sequence of instructions that belong to the same \
864 Without modifiers, it prints the function name.\n\
865 With a /l modifier, the source file and line number range is included.\n\
866 With a /i modifier, the instruction number range is included.\n\
867 With a /c modifier, the output is indented based on the call stack depth.\n\
868 With no argument, prints ten more lines after the previous ten-line print.\n\
869 \"record function-call-history -\" prints ten lines before a previous ten-line \
871 One argument specifies a function number as shown by 'info record', and \
872 ten lines are printed after that function.\n\
873 Two arguments with comma between them specify a range of functions to print.\n\
874 If the second argument is preceded by '+' or '-', it specifies the distance \
875 from the first argument.\n\
876 The number of functions to print can be defined with \"set record \
877 function-call-history-size\"."),
880 /* Sync command control variables. */
881 record_insn_history_size_setshow_var
= record_insn_history_size
;
882 record_call_history_size_setshow_var
= record_call_history_size
;