1 /* Top level stuff for GDB, the GNU debugger.
3 Copyright (C) 1986-2016 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 "cli/cli-cmds.h"
23 #include "cli/cli-script.h"
24 #include "cli/cli-setshow.h"
25 #include "cli/cli-decode.h"
31 #include "target-dcache.h"
32 #include "breakpoint.h"
34 #include "expression.h"
37 #include "terminal.h" /* For job_control. */
39 #include "completer.h"
45 #include "event-loop.h"
46 #include "gdbthread.h"
47 #include "extension.h"
51 #include "filenames.h"
54 #include "gdb_select.h"
56 /* readline include files. */
57 #include "readline/readline.h"
58 #include "readline/history.h"
60 /* readline defines this. */
63 #include <sys/types.h>
65 #include "event-top.h"
70 #include "tracepoint.h"
77 extern void initialize_all_files (void);
79 #define PROMPT(X) the_prompts.prompt_stack[the_prompts.top + X].prompt
80 #define PREFIX(X) the_prompts.prompt_stack[the_prompts.top + X].prefix
81 #define SUFFIX(X) the_prompts.prompt_stack[the_prompts.top + X].suffix
83 /* Default command line prompt. This is overriden in some configs. */
85 #ifndef DEFAULT_PROMPT
86 #define DEFAULT_PROMPT "(gdb) "
89 /* Generate a function that exports a pointer to a field of the
92 #define gen_ret_current_ui_field_ptr(type, name) \
94 current_ui_## name ## _ptr (void) \
96 return ¤t_ui->m_ ## name; \
99 gen_ret_current_ui_field_ptr (struct ui_file *, gdb_stdout)
100 gen_ret_current_ui_field_ptr (struct ui_file *, gdb_stdin)
101 gen_ret_current_ui_field_ptr (struct ui_file *, gdb_stderr)
102 gen_ret_current_ui_field_ptr (struct ui_file *, gdb_stdlog)
103 gen_ret_current_ui_field_ptr (struct ui_out *, current_uiout)
105 /* Initialization file name for gdb. This is host-dependent. */
107 const char gdbinit[] = GDBINIT;
109 int inhibit_gdbinit = 0;
111 extern char lang_frame_mismatch_warn[]; /* language.c */
113 /* Flag for whether we want to confirm potentially dangerous
114 operations. Default is yes. */
119 show_confirm (struct ui_file *file, int from_tty,
120 struct cmd_list_element *c, const char *value)
122 fprintf_filtered (file, _("Whether to confirm potentially "
123 "dangerous operations is %s.\n"),
127 /* Flag to indicate whether a user defined command is currently running. */
131 /* Current working directory. */
133 char *current_directory;
135 /* The directory name is actually stored here (usually). */
136 char gdb_dirbuf[1024];
138 /* The last command line executed on the console. Used for command
140 char *saved_command_line;
142 /* Nonzero if the current command is modified by "server ". This
143 affects things like recording into the command history, commands
144 repeating on RETURN, etc. This is so a user interface (emacs, GUI,
145 whatever) can issue its own commands and also send along commands
146 from the user, and have the user not notice that the user interface
147 is issuing commands too. */
150 /* Timeout limit for response from target. */
152 /* The default value has been changed many times over the years. It
153 was originally 5 seconds. But that was thought to be a long time
154 to sit and wait, so it was changed to 2 seconds. That was thought
155 to be plenty unless the connection was going through some terminal
156 server or multiplexer or other form of hairy serial connection.
158 In mid-1996, remote_timeout was moved from remote.c to top.c and
159 it began being used in other remote-* targets. It appears that the
160 default was changed to 20 seconds at that time, perhaps because the
161 Renesas E7000 ICE didn't always respond in a timely manner.
163 But if 5 seconds is a long time to sit and wait for retransmissions,
164 20 seconds is far worse. This demonstrates the difficulty of using
165 a single variable for all protocol timeouts.
167 As remote.c is used much more than remote-e7000.c, it was changed
168 back to 2 seconds in 1999. */
170 int remote_timeout = 2;
172 /* Non-zero tells remote* modules to output debugging info. */
174 int remote_debug = 0;
176 /* Sbrk location on entry to main. Used for statistics only. */
181 /* Hooks for alternate command interfaces. */
183 /* This hook is called from within gdb's many mini-event loops which
184 could steal control from a real user interface's event loop. It
185 returns non-zero if the user is requesting a detach, zero
188 int (*deprecated_ui_loop_hook) (int);
191 /* Called from print_frame_info to list the line we stopped in. */
193 void (*deprecated_print_frame_info_listing_hook) (struct symtab * s,
197 /* Replaces most of query. */
199 int (*deprecated_query_hook) (const char *, va_list);
201 /* Replaces most of warning. */
203 void (*deprecated_warning_hook) (const char *, va_list);
205 /* These three functions support getting lines of text from the user.
206 They are used in sequence. First deprecated_readline_begin_hook is
207 called with a text string that might be (for example) a message for
208 the user to type in a sequence of commands to be executed at a
209 breakpoint. If this function calls back to a GUI, it might take
210 this opportunity to pop up a text interaction window with this
211 message. Next, deprecated_readline_hook is called with a prompt
212 that is emitted prior to collecting the user input. It can be
213 called multiple times. Finally, deprecated_readline_end_hook is
214 called to notify the GUI that we are done with the interaction
215 window and it can close it. */
217 void (*deprecated_readline_begin_hook) (char *, ...);
218 char *(*deprecated_readline_hook) (const char *);
219 void (*deprecated_readline_end_hook) (void);
221 /* Called as appropriate to notify the interface that we have attached
222 to or detached from an already running process. */
224 void (*deprecated_attach_hook) (void);
225 void (*deprecated_detach_hook) (void);
227 /* Called during long calculations to allow GUI to repair window
228 damage, and to check for stop buttons, etc... */
230 void (*deprecated_interactive_hook) (void);
232 /* Called when going to wait for the target. Usually allows the GUI
233 to run while waiting for target events. */
235 ptid_t (*deprecated_target_wait_hook) (ptid_t ptid,
236 struct target_waitstatus *status,
239 /* Used by UI as a wrapper around command execution. May do various
240 things like enabling/disabling buttons, etc... */
242 void (*deprecated_call_command_hook) (struct cmd_list_element * c,
243 char *cmd, int from_tty);
245 /* Called when the current thread changes. Argument is thread id. */
247 void (*deprecated_context_hook) (int id);
249 /* Handler for SIGHUP. */
252 /* NOTE 1999-04-29: This function will be static again, once we modify
253 gdb to use the event loop as the default command loop and we merge
254 event-top.c into this file, top.c. */
258 /* Stop asking user for confirmation --- we're exiting. This
259 prevents asking the user dumb questions. */
261 quit_command ((char *) 0, 0);
263 #endif /* defined SIGHUP */
265 /* Line number we are currently in, in a file which is being sourced. */
266 /* NOTE 1999-04-29: This variable will be static again, once we modify
267 gdb to use the event loop as the default command loop and we merge
268 event-top.c into this file, top.c. */
269 /* static */ int source_line_number;
271 /* Name of the file we are sourcing. */
272 /* NOTE 1999-04-29: This variable will be static again, once we modify
273 gdb to use the event loop as the default command loop and we merge
274 event-top.c into this file, top.c. */
275 /* static */ const char *source_file_name;
277 /* Clean up on error during a "source" command (or execution of a
278 user-defined command). */
281 do_restore_instream_cleanup (void *stream)
283 struct ui *ui = current_ui;
285 /* Restore the previous input stream. */
286 ui->instream = (FILE *) stream;
289 /* Read commands from STREAM. */
291 read_command_file (FILE *stream)
293 struct ui *ui = current_ui;
294 struct cleanup *cleanups;
296 cleanups = make_cleanup (do_restore_instream_cleanup, ui->instream);
297 ui->instream = stream;
299 /* Read commands from `instream' and execute them until end of file
300 or error reading instream. */
302 while (ui->instream != NULL && !feof (ui->instream))
306 /* Get a command-line. This calls the readline package. */
307 command = command_line_input (NULL, 0, NULL);
310 command_handler (command);
313 do_cleanups (cleanups);
316 void (*pre_init_ui_hook) (void);
320 do_chdir_cleanup (void *old_dir)
328 prepare_execute_command (void)
331 struct cleanup *cleanup;
333 mark = value_mark ();
334 cleanup = make_cleanup_value_free_to_mark (mark);
336 /* With multiple threads running while the one we're examining is
337 stopped, the dcache can get stale without us being able to detect
338 it. For the duration of the command, though, use the dcache to
339 help things like backtrace. */
341 target_dcache_invalidate ();
346 /* Tell the user if the language has changed (except first time) after
347 executing a command. */
350 check_frame_language_change (void)
352 static int warned = 0;
353 struct frame_info *frame;
355 /* First make sure that a new frame has been selected, in case the
356 command or the hooks changed the program state. */
357 frame = deprecated_safe_get_selected_frame ();
358 if (current_language != expected_language)
360 if (language_mode == language_mode_auto && info_verbose)
362 language_info (1); /* Print what changed. */
367 /* Warn the user if the working language does not match the language
368 of the current frame. Only warn the user if we are actually
369 running the program, i.e. there is a stack. */
370 /* FIXME: This should be cacheing the frame and only running when
371 the frame changes. */
373 if (has_stack_frames ())
377 flang = get_frame_language (frame);
379 && flang != language_unknown
380 && flang != current_language->la_language)
382 printf_filtered ("%s\n", lang_frame_mismatch_warn);
391 wait_sync_command_done (void)
393 while (gdb_do_one_event () >= 0)
401 maybe_wait_sync_command_done (int was_sync)
403 /* If the interpreter is in sync mode (we're running a user
404 command's list, running command hooks or similars), and we
405 just ran a synchronous command that started the target, wait
406 for that command to end. */
407 if (!current_ui->async && !was_sync && sync_execution)
408 wait_sync_command_done ();
411 /* Execute the line P as a command, in the current user context.
412 Pass FROM_TTY as second argument to the defining function. */
415 execute_command (char *p, int from_tty)
417 struct cleanup *cleanup_if_error, *cleanup;
418 struct cmd_list_element *c;
421 cleanup_if_error = make_bpstat_clear_actions_cleanup ();
422 cleanup = prepare_execute_command ();
424 /* Force cleanup of any alloca areas if using C alloca instead of
428 /* This can happen when command_line_input hits end of file. */
431 do_cleanups (cleanup);
432 discard_cleanups (cleanup_if_error);
436 target_log_command (p);
438 while (*p == ' ' || *p == '\t')
444 int was_sync = sync_execution;
448 /* If trace-commands is set then this will print this command. */
449 print_command_trace (p);
451 c = lookup_cmd (&cmd, cmdlist, "", 0, 1);
454 /* Pass null arg rather than an empty one. */
457 /* FIXME: cagney/2002-02-02: The c->type test is pretty dodgy
458 while the is_complete_command(cfunc) test is just plain
459 bogus. They should both be replaced by a test of the form
460 c->strip_trailing_white_space_p. */
461 /* NOTE: cagney/2002-02-02: The function.cfunc in the below
462 can't be replaced with func. This is because it is the
463 cfunc, and not the func, that has the value that the
464 is_complete_command hack is testing for. */
465 /* Clear off trailing whitespace, except for set and complete
468 && c->type != set_cmd
469 && !is_complete_command (c))
471 p = arg + strlen (arg) - 1;
472 while (p >= arg && (*p == ' ' || *p == '\t'))
477 /* If this command has been pre-hooked, run the hook first. */
478 execute_cmd_pre_hook (c);
480 if (c->deprecated_warn_user)
481 deprecated_cmd_warning (line);
483 /* c->user_commands would be NULL in the case of a python command. */
484 if (c->theclass == class_user && c->user_commands)
485 execute_user_command (c, arg);
486 else if (c->type == set_cmd)
487 do_set_command (arg, from_tty, c);
488 else if (c->type == show_cmd)
489 do_show_command (arg, from_tty, c);
490 else if (!cmd_func_p (c))
491 error (_("That is not a command, just a help topic."));
492 else if (deprecated_call_command_hook)
493 deprecated_call_command_hook (c, arg, from_tty);
495 cmd_func (c, arg, from_tty);
497 maybe_wait_sync_command_done (was_sync);
499 /* If this command has been post-hooked, run the hook last. */
500 execute_cmd_post_hook (c);
504 check_frame_language_change ();
506 do_cleanups (cleanup);
507 discard_cleanups (cleanup_if_error);
510 /* Run execute_command for P and FROM_TTY. Capture its output into the
511 returned string, do not display it to the screen. BATCH_FLAG will be
512 temporarily set to true. */
515 execute_command_to_string (char *p, int from_tty)
517 struct ui_file *str_file;
518 struct cleanup *cleanup;
521 /* GDB_STDOUT should be better already restored during these
522 restoration callbacks. */
523 cleanup = set_batch_flag_and_make_cleanup_restore_page_info ();
525 make_cleanup_restore_integer (¤t_ui->async);
526 current_ui->async = 0;
528 str_file = mem_fileopen ();
530 make_cleanup_ui_file_delete (str_file);
531 make_cleanup_restore_ui_file (&gdb_stdout);
532 make_cleanup_restore_ui_file (&gdb_stderr);
533 make_cleanup_restore_ui_file (&gdb_stdlog);
534 make_cleanup_restore_ui_file (&gdb_stdtarg);
535 make_cleanup_restore_ui_file (&gdb_stdtargerr);
537 if (ui_out_redirect (current_uiout, str_file) < 0)
538 warning (_("Current output protocol does not support redirection"));
540 make_cleanup_ui_out_redirect_pop (current_uiout);
542 gdb_stdout = str_file;
543 gdb_stderr = str_file;
544 gdb_stdlog = str_file;
545 gdb_stdtarg = str_file;
546 gdb_stdtargerr = str_file;
548 execute_command (p, from_tty);
550 retval = ui_file_xstrdup (str_file, NULL);
552 do_cleanups (cleanup);
558 /* When nonzero, cause dont_repeat to do nothing. This should only be
559 set via prevent_dont_repeat. */
561 static int suppress_dont_repeat = 0;
563 /* Commands call this if they do not want to be repeated by null lines. */
568 struct ui *ui = current_ui;
570 if (suppress_dont_repeat || server_command)
573 /* If we aren't reading from standard input, we are saving the last
574 thing read from stdin in line and don't want to delete it. Null
575 lines won't repeat here in any case. */
576 if (ui->instream == stdin)
577 *saved_command_line = 0;
580 /* Prevent dont_repeat from working, and return a cleanup that
581 restores the previous state. */
584 prevent_dont_repeat (void)
586 struct cleanup *result = make_cleanup_restore_integer (&suppress_dont_repeat);
588 suppress_dont_repeat = 1;
593 /* Read a line from the stream "instream" without command line editing.
595 It prints PROMPT once at the start.
596 Action is compatible with "readline", e.g. space for the result is
597 malloc'd and should be freed by the caller.
599 A NULL return means end of file. */
602 gdb_readline_no_editing (const char *prompt)
604 struct buffer line_buffer;
605 struct ui *ui = current_ui;
606 /* Read from stdin if we are executing a user defined command. This
607 is the right thing for prompt_for_continue, at least. */
608 FILE *stream = ui->instream != NULL ? ui->instream : stdin;
609 int fd = fileno (stream);
611 buffer_init (&line_buffer);
615 /* Don't use a _filtered function here. It causes the assumed
616 character position to be off, since the newline we read from
617 the user is not accounted for. */
618 fputs_unfiltered (prompt, gdb_stdout);
619 gdb_flush (gdb_stdout);
630 /* Wait until at least one byte of data is available. Control-C
631 can interrupt interruptible_select, but not fgetc. */
633 FD_SET (fd, &readfds);
634 if (interruptible_select (fd + 1, &readfds, NULL, NULL, NULL) == -1)
638 /* If this was ctrl-c, the QUIT above handles it. */
641 perror_with_name (("select"));
648 if (line_buffer.used_size > 0)
649 /* The last line does not end with a newline. Return it, and
650 if we are called again fgetc will still return EOF and
651 we'll return NULL then. */
653 xfree (buffer_finish (&line_buffer));
659 if (line_buffer.used_size > 0
660 && line_buffer.buffer[line_buffer.used_size - 1] == '\r')
661 line_buffer.used_size--;
665 buffer_grow_char (&line_buffer, c);
668 buffer_grow_char (&line_buffer, '\0');
669 return buffer_finish (&line_buffer);
672 /* Variables which control command line editing and history
673 substitution. These variables are given default values at the end
675 static int command_editing_p;
677 /* NOTE 1999-04-29: This variable will be static again, once we modify
678 gdb to use the event loop as the default command loop and we merge
679 event-top.c into this file, top.c. */
681 /* static */ int history_expansion_p;
683 static int write_history_p;
685 show_write_history_p (struct ui_file *file, int from_tty,
686 struct cmd_list_element *c, const char *value)
688 fprintf_filtered (file, _("Saving of the history record on exit is %s.\n"),
692 /* The variable associated with the "set/show history size"
693 command. The value -1 means unlimited, and -2 means undefined. */
694 static int history_size_setshow_var = -2;
697 show_history_size (struct ui_file *file, int from_tty,
698 struct cmd_list_element *c, const char *value)
700 fprintf_filtered (file, _("The size of the command history is %s.\n"),
704 /* Variable associated with the "history remove-duplicates" option.
705 The value -1 means unlimited. */
706 static int history_remove_duplicates = 0;
709 show_history_remove_duplicates (struct ui_file *file, int from_tty,
710 struct cmd_list_element *c, const char *value)
712 fprintf_filtered (file,
713 _("The number of history entries to look back at for "
714 "duplicates is %s.\n"),
718 static char *history_filename;
720 show_history_filename (struct ui_file *file, int from_tty,
721 struct cmd_list_element *c, const char *value)
723 fprintf_filtered (file, _("The filename in which to record "
724 "the command history is \"%s\".\n"),
728 /* This is like readline(), but it has some gdb-specific behavior.
729 gdb may want readline in both the synchronous and async modes during
730 a single gdb invocation. At the ordinary top-level prompt we might
731 be using the async readline. That means we can't use
732 rl_pre_input_hook, since it doesn't work properly in async mode.
733 However, for a secondary prompt (" >", such as occurs during a
734 `define'), gdb wants a synchronous response.
736 We used to call readline() directly, running it in synchronous
737 mode. But mixing modes this way is not supported, and as of
738 readline 5.x it no longer works; the arrow keys come unbound during
739 the synchronous call. So we make a nested call into the event
740 loop. That's what gdb_readline_wrapper is for. */
742 /* A flag set as soon as gdb_readline_wrapper_line is called; we can't
743 rely on gdb_readline_wrapper_result, which might still be NULL if
744 the user types Control-D for EOF. */
745 static int gdb_readline_wrapper_done;
747 /* The result of the current call to gdb_readline_wrapper, once a newline
749 static char *gdb_readline_wrapper_result;
751 /* Any intercepted hook. Operate-and-get-next sets this, expecting it
752 to be called after the newline is processed (which will redisplay
753 the prompt). But in gdb_readline_wrapper we will not get a new
754 prompt until the next call, or until we return to the event loop.
755 So we disable this hook around the newline and restore it before we
757 static void (*saved_after_char_processing_hook) (void);
760 /* The number of nested readline secondary prompts that are currently
763 static int gdb_secondary_prompt_depth = 0;
768 gdb_in_secondary_prompt_p (void)
770 return gdb_secondary_prompt_depth > 0;
774 /* This function is called when readline has seen a complete line of
778 gdb_readline_wrapper_line (char *line)
780 gdb_assert (!gdb_readline_wrapper_done);
781 gdb_readline_wrapper_result = line;
782 gdb_readline_wrapper_done = 1;
784 /* Prevent operate-and-get-next from acting too early. */
785 saved_after_char_processing_hook = after_char_processing_hook;
786 after_char_processing_hook = NULL;
788 /* Prevent parts of the prompt from being redisplayed if annotations
789 are enabled, and readline's state getting out of sync. We'll
790 reinstall the callback handler, which puts the terminal in raw
791 mode (or in readline lingo, in prepped state), when we're next
792 ready to process user input, either in display_gdb_prompt, or if
793 we're handling an asynchronous target event and running in the
794 background, just before returning to the event loop to process
795 further input (or more target events). */
796 if (async_command_editing_p)
797 gdb_rl_callback_handler_remove ();
800 struct gdb_readline_wrapper_cleanup
802 void (*handler_orig) (char *);
803 int already_prompted_orig;
805 /* Whether the target was async. */
806 int target_is_async_orig;
810 gdb_readline_wrapper_cleanup (void *arg)
812 struct ui *ui = current_ui;
813 struct gdb_readline_wrapper_cleanup *cleanup
814 = (struct gdb_readline_wrapper_cleanup *) arg;
816 rl_already_prompted = cleanup->already_prompted_orig;
818 gdb_assert (ui->input_handler == gdb_readline_wrapper_line);
819 ui->input_handler = cleanup->handler_orig;
821 /* Don't restore our input handler in readline yet. That would make
822 readline prep the terminal (putting it in raw mode), while the
823 line we just read may trigger execution of a command that expects
824 the terminal in the default cooked/canonical mode, such as e.g.,
825 running Python's interactive online help utility. See
826 gdb_readline_wrapper_line for when we'll reinstall it. */
828 gdb_readline_wrapper_result = NULL;
829 gdb_readline_wrapper_done = 0;
830 gdb_secondary_prompt_depth--;
831 gdb_assert (gdb_secondary_prompt_depth >= 0);
833 after_char_processing_hook = saved_after_char_processing_hook;
834 saved_after_char_processing_hook = NULL;
836 if (cleanup->target_is_async_orig)
843 gdb_readline_wrapper (const char *prompt)
845 struct ui *ui = current_ui;
846 struct cleanup *back_to;
847 struct gdb_readline_wrapper_cleanup *cleanup;
850 cleanup = XNEW (struct gdb_readline_wrapper_cleanup);
851 cleanup->handler_orig = ui->input_handler;
852 ui->input_handler = gdb_readline_wrapper_line;
854 cleanup->already_prompted_orig = rl_already_prompted;
856 cleanup->target_is_async_orig = target_is_async_p ();
858 gdb_secondary_prompt_depth++;
859 back_to = make_cleanup (gdb_readline_wrapper_cleanup, cleanup);
861 if (cleanup->target_is_async_orig)
864 /* Display our prompt and prevent double prompt display. */
865 display_gdb_prompt (prompt);
866 rl_already_prompted = 1;
868 if (after_char_processing_hook)
869 (*after_char_processing_hook) ();
870 gdb_assert (after_char_processing_hook == NULL);
872 while (gdb_do_one_event () >= 0)
873 if (gdb_readline_wrapper_done)
876 retval = gdb_readline_wrapper_result;
877 do_cleanups (back_to);
882 /* The current saved history number from operate-and-get-next.
883 This is -1 if not valid. */
884 static int operate_saved_history = -1;
886 /* This is put on the appropriate hook and helps operate-and-get-next
889 gdb_rl_operate_and_get_next_completion (void)
891 int delta = where_history () - operate_saved_history;
893 /* The `key' argument to rl_get_previous_history is ignored. */
894 rl_get_previous_history (delta, 0);
895 operate_saved_history = -1;
897 /* readline doesn't automatically update the display for us. */
900 after_char_processing_hook = NULL;
901 rl_pre_input_hook = NULL;
904 /* This is a gdb-local readline command handler. It accepts the
905 current command line (like RET does) and, if this command was taken
906 from the history, arranges for the next command in the history to
907 appear on the command line when the prompt returns.
908 We ignore the arguments. */
910 gdb_rl_operate_and_get_next (int count, int key)
914 /* Use the async hook. */
915 after_char_processing_hook = gdb_rl_operate_and_get_next_completion;
917 /* Find the current line, and find the next line to use. */
918 where = where_history();
920 if ((history_is_stifled () && (history_length >= history_max_entries))
921 || (where >= history_length - 1))
922 operate_saved_history = where;
924 operate_saved_history = where + 1;
926 return rl_newline (1, key);
929 /* Number of user commands executed during this session. */
931 static int command_count = 0;
933 /* Add the user command COMMAND to the input history list. */
936 gdb_add_history (const char *command)
940 if (history_remove_duplicates != 0)
943 int lookbehind_threshold;
945 /* The lookbehind threshold for finding a duplicate history entry is
946 bounded by command_count because we can't meaningfully delete
947 history entries that are already stored in the history file since
948 the history file is appended to. */
949 if (history_remove_duplicates == -1
950 || history_remove_duplicates > command_count)
951 lookbehind_threshold = command_count;
953 lookbehind_threshold = history_remove_duplicates;
956 for (lookbehind = 0; lookbehind < lookbehind_threshold; lookbehind++)
958 HIST_ENTRY *temp = previous_history ();
963 if (strcmp (temp->line, command) == 0)
965 HIST_ENTRY *prev = remove_history (where_history ());
967 free_history_entry (prev);
974 add_history (command);
977 /* Safely append new history entries to the history file in a corruption-free
978 way using an intermediate local history file. */
981 gdb_safe_append_history (void)
983 int ret, saved_errno;
984 char *local_history_filename;
985 struct cleanup *old_chain;
987 local_history_filename
988 = xstrprintf ("%s-gdb%d~", history_filename, getpid ());
989 old_chain = make_cleanup (xfree, local_history_filename);
991 ret = rename (history_filename, local_history_filename);
993 if (ret < 0 && saved_errno != ENOENT)
995 warning (_("Could not rename %s to %s: %s"),
996 history_filename, local_history_filename,
997 safe_strerror (saved_errno));
1003 /* If the rename failed with ENOENT then either the global history
1004 file never existed in the first place or another GDB process is
1005 currently appending to it (and has thus temporarily renamed it).
1006 Since we can't distinguish between these two cases, we have to
1007 conservatively assume the first case and therefore must write out
1008 (not append) our known history to our local history file and try
1009 to move it back anyway. Otherwise a global history file would
1010 never get created! */
1011 gdb_assert (saved_errno == ENOENT);
1012 write_history (local_history_filename);
1016 append_history (command_count, local_history_filename);
1017 if (history_is_stifled ())
1018 history_truncate_file (local_history_filename, history_max_entries);
1021 ret = rename (local_history_filename, history_filename);
1022 saved_errno = errno;
1023 if (ret < 0 && saved_errno != EEXIST)
1024 warning (_("Could not rename %s to %s: %s"),
1025 local_history_filename, history_filename,
1026 safe_strerror (saved_errno));
1029 do_cleanups (old_chain);
1032 /* Read one line from the command input stream `instream' into a local
1033 static buffer. The buffer is made bigger as necessary. Returns
1034 the address of the start of the line.
1036 NULL is returned for end of file.
1038 *If* the instream == stdin & stdin is a terminal, the line read is
1039 copied into the global 'saved_command_line' so that it can be
1042 This routine either uses fancy command line editing or simple input
1043 as the user has requested. */
1046 command_line_input (const char *prompt_arg, int repeat, char *annotation_suffix)
1048 static struct buffer cmd_line_buffer;
1049 static int cmd_line_buffer_initialized;
1050 struct ui *ui = current_ui;
1051 const char *prompt = prompt_arg;
1054 /* The annotation suffix must be non-NULL. */
1055 if (annotation_suffix == NULL)
1056 annotation_suffix = "";
1058 if (annotation_level > 1 && ui->instream == stdin)
1063 = (char *) alloca ((prompt == NULL ? 0 : strlen (prompt))
1064 + strlen (annotation_suffix) + 40);
1066 local_prompt[0] = '\0';
1068 strcpy (local_prompt, prompt);
1069 strcat (local_prompt, "\n\032\032");
1070 strcat (local_prompt, annotation_suffix);
1071 strcat (local_prompt, "\n");
1073 prompt = local_prompt;
1076 if (!cmd_line_buffer_initialized)
1078 buffer_init (&cmd_line_buffer);
1079 cmd_line_buffer_initialized = 1;
1082 /* Starting a new command line. */
1083 cmd_line_buffer.used_size = 0;
1087 signal (STOP_SIGNAL, handle_stop_sig);
1094 /* Make sure that all output has been output. Some machines may
1095 let you get away with leaving out some of the gdb_flush, but
1098 gdb_flush (gdb_stdout);
1099 gdb_flush (gdb_stderr);
1101 if (source_file_name != NULL)
1102 ++source_line_number;
1104 if (annotation_level > 1 && ui->instream == stdin)
1106 puts_unfiltered ("\n\032\032pre-");
1107 puts_unfiltered (annotation_suffix);
1108 puts_unfiltered ("\n");
1111 /* Don't use fancy stuff if not talking to stdin. */
1112 if (deprecated_readline_hook && input_from_terminal_p ())
1114 rl = (*deprecated_readline_hook) (prompt);
1116 else if (command_editing_p && input_from_terminal_p ())
1118 rl = gdb_readline_wrapper (prompt);
1122 rl = gdb_readline_no_editing (prompt);
1125 cmd = handle_line_of_input (&cmd_line_buffer, rl,
1126 repeat, annotation_suffix);
1127 if (cmd == (char *) EOF)
1140 signal (STOP_SIGNAL, SIG_DFL);
1146 /* Print the GDB banner. */
1148 print_gdb_version (struct ui_file *stream)
1150 /* From GNU coding standards, first line is meant to be easy for a
1151 program to parse, and is just canonical program name and version
1152 number, which starts after last space. */
1154 fprintf_filtered (stream, "GNU gdb %s%s\n", PKGVERSION, version);
1156 /* Second line is a copyright notice. */
1158 fprintf_filtered (stream,
1159 "Copyright (C) 2016 Free Software Foundation, Inc.\n");
1161 /* Following the copyright is a brief statement that the program is
1162 free software, that users are free to copy and change it on
1163 certain conditions, that it is covered by the GNU GPL, and that
1164 there is no warranty. */
1166 fprintf_filtered (stream, "\
1167 License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>\
1168 \nThis is free software: you are free to change and redistribute it.\n\
1169 There is NO WARRANTY, to the extent permitted by law. Type \"show copying\"\n\
1170 and \"show warranty\" for details.\n");
1172 /* After the required info we print the configuration information. */
1174 fprintf_filtered (stream, "This GDB was configured as \"");
1175 if (strcmp (host_name, target_name) != 0)
1177 fprintf_filtered (stream, "--host=%s --target=%s",
1178 host_name, target_name);
1182 fprintf_filtered (stream, "%s", host_name);
1184 fprintf_filtered (stream, "\".\n\
1185 Type \"show configuration\" for configuration details.");
1187 if (REPORT_BUGS_TO[0])
1189 fprintf_filtered (stream,
1190 _("\nFor bug reporting instructions, please see:\n"));
1191 fprintf_filtered (stream, "%s.\n", REPORT_BUGS_TO);
1193 fprintf_filtered (stream,
1194 _("Find the GDB manual and other documentation \
1195 resources online at:\n<http://www.gnu.org/software/gdb/documentation/>.\n"));
1196 fprintf_filtered (stream, _("For help, type \"help\".\n"));
1197 fprintf_filtered (stream, _("Type \"apropos word\" to search for \
1198 commands related to \"word\"."));
1201 /* Print the details of GDB build-time configuration. */
1203 print_gdb_configuration (struct ui_file *stream)
1205 fprintf_filtered (stream, _("\
1206 This GDB was configured as follows:\n\
1207 configure --host=%s --target=%s\n\
1208 "), host_name, target_name);
1209 fprintf_filtered (stream, _("\
1210 --with-auto-load-dir=%s\n\
1211 --with-auto-load-safe-path=%s\n\
1212 "), AUTO_LOAD_DIR, AUTO_LOAD_SAFE_PATH);
1214 fprintf_filtered (stream, _("\
1218 fprintf_filtered (stream, _("\
1223 fprintf_filtered (stream, _("\
1224 --with-gdb-datadir=%s%s\n\
1225 "), GDB_DATADIR, GDB_DATADIR_RELOCATABLE ? " (relocatable)" : "");
1227 fprintf_filtered (stream, _("\
1228 --with-iconv-bin=%s%s\n\
1229 "), ICONV_BIN, ICONV_BIN_RELOCATABLE ? " (relocatable)" : "");
1231 if (JIT_READER_DIR[0])
1232 fprintf_filtered (stream, _("\
1233 --with-jit-reader-dir=%s%s\n\
1234 "), JIT_READER_DIR, JIT_READER_DIR_RELOCATABLE ? " (relocatable)" : "");
1235 #if HAVE_LIBUNWIND_IA64_H
1236 fprintf_filtered (stream, _("\
1237 --with-libunwind-ia64\n\
1240 fprintf_filtered (stream, _("\
1241 --without-libunwind-ia64\n\
1245 fprintf_filtered (stream, _("\
1249 fprintf_filtered (stream, _("\
1253 #ifdef WITH_PYTHON_PATH
1254 fprintf_filtered (stream, _("\
1255 --with-python=%s%s\n\
1256 "), WITH_PYTHON_PATH, PYTHON_PATH_RELOCATABLE ? " (relocatable)" : "");
1259 fprintf_filtered (stream, _("\
1263 fprintf_filtered (stream, _("\
1268 fprintf_filtered (stream, _("\
1269 --with-relocated-sources=%s\n\
1273 fprintf_filtered (stream, _("\
1274 --with-separate-debug-dir=%s%s\n\
1275 "), DEBUGDIR, DEBUGDIR_RELOCATABLE ? " (relocatable)" : "");
1276 if (TARGET_SYSTEM_ROOT[0])
1277 fprintf_filtered (stream, _("\
1278 --with-sysroot=%s%s\n\
1279 "), TARGET_SYSTEM_ROOT, TARGET_SYSTEM_ROOT_RELOCATABLE ? " (relocatable)" : "");
1280 if (SYSTEM_GDBINIT[0])
1281 fprintf_filtered (stream, _("\
1282 --with-system-gdbinit=%s%s\n\
1283 "), SYSTEM_GDBINIT, SYSTEM_GDBINIT_RELOCATABLE ? " (relocatable)" : "");
1284 #if HAVE_LIBBABELTRACE
1285 fprintf_filtered (stream, _("\
1286 --with-babeltrace\n\
1289 fprintf_filtered (stream, _("\
1290 --without-babeltrace\n\
1293 /* We assume "relocatable" will be printed at least once, thus we always
1294 print this text. It's a reasonably safe assumption for now. */
1295 fprintf_filtered (stream, _("\n\
1296 (\"Relocatable\" means the directory can be moved with the GDB installation\n\
1297 tree, and GDB will still find it.)\n\
1302 /* The current top level prompt, settable with "set prompt", and/or
1303 with the python `gdb.prompt_hook' hook. */
1304 static char *top_prompt;
1306 /* Access method for the GDB prompt string. */
1314 /* Set method for the GDB prompt string. */
1317 set_prompt (const char *s)
1319 char *p = xstrdup (s);
1332 /* Callback for iterate_over_inferiors. Kills or detaches the given
1333 inferior, depending on how we originally gained control of it. */
1336 kill_or_detach (struct inferior *inf, void *args)
1338 struct qt_args *qt = (struct qt_args *) args;
1339 struct thread_info *thread;
1344 thread = any_thread_of_process (inf->pid);
1347 switch_to_thread (thread->ptid);
1349 /* Leave core files alone. */
1350 if (target_has_execution)
1352 if (inf->attach_flag)
1353 target_detach (qt->args, qt->from_tty);
1362 /* Callback for iterate_over_inferiors. Prints info about what GDB
1363 will do to each inferior on a "quit". ARG points to a struct
1364 ui_out where output is to be collected. */
1367 print_inferior_quit_action (struct inferior *inf, void *arg)
1369 struct ui_file *stb = (struct ui_file *) arg;
1374 if (inf->attach_flag)
1375 fprintf_filtered (stb,
1376 _("\tInferior %d [%s] will be detached.\n"), inf->num,
1377 target_pid_to_str (pid_to_ptid (inf->pid)));
1379 fprintf_filtered (stb,
1380 _("\tInferior %d [%s] will be killed.\n"), inf->num,
1381 target_pid_to_str (pid_to_ptid (inf->pid)));
1386 /* If necessary, make the user confirm that we should quit. Return
1387 non-zero if we should quit, zero if we shouldn't. */
1392 struct ui_file *stb;
1393 struct cleanup *old_chain;
1397 /* Don't even ask if we're only debugging a core file inferior. */
1398 if (!have_live_inferiors ())
1401 /* Build the query string as a single string. */
1402 stb = mem_fileopen ();
1403 old_chain = make_cleanup_ui_file_delete (stb);
1405 fprintf_filtered (stb, _("A debugging session is active.\n\n"));
1406 iterate_over_inferiors (print_inferior_quit_action, stb);
1407 fprintf_filtered (stb, _("\nQuit anyway? "));
1409 str = ui_file_xstrdup (stb, NULL);
1410 make_cleanup (xfree, str);
1412 qr = query ("%s", str);
1413 do_cleanups (old_chain);
1417 /* Prepare to exit GDB cleanly by undoing any changes made to the
1418 terminal so that we leave the terminal in the state we acquired it. */
1421 undo_terminal_modifications_before_exit (void)
1423 target_terminal_ours ();
1427 if (async_command_editing_p)
1428 gdb_disable_readline ();
1432 /* Quit without asking for confirmation. */
1435 quit_force (char *args, int from_tty)
1440 undo_terminal_modifications_before_exit ();
1442 /* An optional expression may be used to cause gdb to terminate with the
1443 value of that expression. */
1446 struct value *val = parse_and_eval (args);
1448 exit_code = (int) value_as_long (val);
1450 else if (return_child_result)
1451 exit_code = return_child_result_value;
1454 qt.from_tty = from_tty;
1456 /* We want to handle any quit errors and exit regardless. */
1458 /* Get out of tfind mode, and kill or detach all inferiors. */
1461 disconnect_tracing ();
1462 iterate_over_inferiors (kill_or_detach, &qt);
1464 CATCH (ex, RETURN_MASK_ALL)
1466 exception_print (gdb_stderr, ex);
1470 /* Give all pushed targets a chance to do minimal cleanup, and pop
1476 CATCH (ex, RETURN_MASK_ALL)
1478 exception_print (gdb_stderr, ex);
1482 /* Save the history information if it is appropriate to do so. */
1485 if (write_history_p && history_filename
1486 && input_from_terminal_p ())
1487 gdb_safe_append_history ();
1489 CATCH (ex, RETURN_MASK_ALL)
1491 exception_print (gdb_stderr, ex);
1495 /* Do any final cleanups before exiting. */
1498 do_final_cleanups (all_cleanups ());
1500 CATCH (ex, RETURN_MASK_ALL)
1502 exception_print (gdb_stderr, ex);
1509 /* Returns whether GDB is running on a terminal and input is
1510 currently coming from that terminal. */
1513 input_from_terminal_p (void)
1515 struct ui *ui = current_ui;
1520 if (gdb_has_a_terminal () && ui->instream == stdin)
1523 /* If INSTREAM is unset, and we are not in a user command, we
1524 must be in Insight. That's like having a terminal, for our
1526 if (ui->instream == NULL && !in_user_command)
1533 dont_repeat_command (char *ignored, int from_tty)
1535 /* Can't call dont_repeat here because we're not necessarily reading
1537 *saved_command_line = 0;
1540 /* Functions to manipulate command line editing control variables. */
1542 /* Number of commands to print in each call to show_commands. */
1543 #define Hist_print 10
1545 show_commands (char *args, int from_tty)
1547 /* Index for history commands. Relative to history_base. */
1550 /* Number of the history entry which we are planning to display next.
1551 Relative to history_base. */
1554 /* Print out some of the commands from the command history. */
1558 if (args[0] == '+' && args[1] == '\0')
1559 /* "info editing +" should print from the stored position. */
1562 /* "info editing <exp>" should print around command number <exp>. */
1563 num = (parse_and_eval_long (args) - history_base) - Hist_print / 2;
1565 /* "show commands" means print the last Hist_print commands. */
1568 num = history_length - Hist_print;
1574 /* If there are at least Hist_print commands, we want to display the last
1575 Hist_print rather than, say, the last 6. */
1576 if (history_length - num < Hist_print)
1578 num = history_length - Hist_print;
1584 offset < num + Hist_print && offset < history_length;
1587 printf_filtered ("%5d %s\n", history_base + offset,
1588 (history_get (history_base + offset))->line);
1591 /* The next command we want to display is the next one that we haven't
1595 /* If the user repeats this command with return, it should do what
1596 "show commands +" does. This is unnecessary if arg is null,
1597 because "show commands +" is not useful after "show commands". */
1598 if (from_tty && args)
1605 /* Update the size of our command history file to HISTORY_SIZE.
1607 A HISTORY_SIZE of -1 stands for unlimited. */
1610 set_readline_history_size (int history_size)
1612 gdb_assert (history_size >= -1);
1614 if (history_size == -1)
1615 unstifle_history ();
1617 stifle_history (history_size);
1620 /* Called by do_setshow_command. */
1622 set_history_size_command (char *args, int from_tty, struct cmd_list_element *c)
1624 set_readline_history_size (history_size_setshow_var);
1628 set_history (char *args, int from_tty)
1630 printf_unfiltered (_("\"set history\" must be followed "
1631 "by the name of a history subcommand.\n"));
1632 help_list (sethistlist, "set history ", all_commands, gdb_stdout);
1636 show_history (char *args, int from_tty)
1638 cmd_show_list (showhistlist, from_tty, "");
1641 int info_verbose = 0; /* Default verbose msgs off. */
1643 /* Called by do_setshow_command. An elaborate joke. */
1645 set_verbose (char *args, int from_tty, struct cmd_list_element *c)
1647 const char *cmdname = "verbose";
1648 struct cmd_list_element *showcmd;
1650 showcmd = lookup_cmd_1 (&cmdname, showlist, NULL, 1);
1651 gdb_assert (showcmd != NULL && showcmd != CMD_LIST_AMBIGUOUS);
1655 c->doc = "Set verbose printing of informational messages.";
1656 showcmd->doc = "Show verbose printing of informational messages.";
1660 c->doc = "Set verbosity.";
1661 showcmd->doc = "Show verbosity.";
1665 /* Init the history buffer. Note that we are called after the init file(s)
1666 have been read so that the user can change the history file via his
1667 .gdbinit file (for instance). The GDBHISTFILE environment variable
1668 overrides all of this. */
1675 tmpenv = getenv ("GDBHISTSIZE");
1682 tmpenv = skip_spaces (tmpenv);
1684 var = strtol (tmpenv, &endptr, 10);
1685 saved_errno = errno;
1686 endptr = skip_spaces (endptr);
1688 /* If GDBHISTSIZE is non-numeric then ignore it. If GDBHISTSIZE is the
1689 empty string, a negative number or a huge positive number (larger than
1690 INT_MAX) then set the history size to unlimited. Otherwise set our
1691 history size to the number we have read. This behavior is consistent
1692 with how bash handles HISTSIZE. */
1693 if (*endptr != '\0')
1695 else if (*tmpenv == '\0'
1698 /* On targets where INT_MAX == LONG_MAX, we have to look at
1699 errno after calling strtol to distinguish between a value that
1700 is exactly INT_MAX and an overflowing value that was clamped
1702 || (var == INT_MAX && saved_errno == ERANGE))
1703 history_size_setshow_var = -1;
1705 history_size_setshow_var = var;
1708 /* If neither the init file nor GDBHISTSIZE has set a size yet, pick the
1710 if (history_size_setshow_var == -2)
1711 history_size_setshow_var = 256;
1713 set_readline_history_size (history_size_setshow_var);
1715 tmpenv = getenv ("GDBHISTFILE");
1717 history_filename = xstrdup (tmpenv);
1718 else if (!history_filename)
1720 /* We include the current directory so that if the user changes
1721 directories the file written will be the same as the one
1724 /* No leading dots in file names are allowed on MSDOS. */
1725 history_filename = concat (current_directory, "/_gdb_history",
1728 history_filename = concat (current_directory, "/.gdb_history",
1732 read_history (history_filename);
1736 show_prompt (struct ui_file *file, int from_tty,
1737 struct cmd_list_element *c, const char *value)
1739 fprintf_filtered (file, _("Gdb's prompt is \"%s\".\n"), value);
1743 show_async_command_editing_p (struct ui_file *file, int from_tty,
1744 struct cmd_list_element *c, const char *value)
1746 fprintf_filtered (file, _("Editing of command lines as "
1747 "they are typed is %s.\n"),
1752 show_annotation_level (struct ui_file *file, int from_tty,
1753 struct cmd_list_element *c, const char *value)
1755 fprintf_filtered (file, _("Annotation_level is %s.\n"), value);
1759 show_exec_done_display_p (struct ui_file *file, int from_tty,
1760 struct cmd_list_element *c, const char *value)
1762 fprintf_filtered (file, _("Notification of completion for "
1763 "asynchronous execution commands is %s.\n"),
1767 /* New values of the "data-directory" parameter are staged here. */
1768 static char *staged_gdb_datadir;
1770 /* "set" command for the gdb_datadir configuration variable. */
1773 set_gdb_datadir (char *args, int from_tty, struct cmd_list_element *c)
1775 set_gdb_data_directory (staged_gdb_datadir);
1776 observer_notify_gdb_datadir_changed ();
1779 /* "show" command for the gdb_datadir configuration variable. */
1782 show_gdb_datadir (struct ui_file *file, int from_tty,
1783 struct cmd_list_element *c, const char *value)
1785 fprintf_filtered (file, _("GDB's data directory is \"%s\".\n"),
1790 set_history_filename (char *args, int from_tty, struct cmd_list_element *c)
1792 /* We include the current directory so that if the user changes
1793 directories the file written will be the same as the one
1795 if (!IS_ABSOLUTE_PATH (history_filename))
1796 history_filename = reconcat (history_filename, current_directory, "/",
1797 history_filename, (char *) NULL);
1803 /* Initialize the prompt to a simple "(gdb) " prompt or to whatever
1804 the DEFAULT_PROMPT is. */
1805 set_prompt (DEFAULT_PROMPT);
1807 /* Set the important stuff up for command editing. */
1808 command_editing_p = 1;
1809 history_expansion_p = 0;
1810 write_history_p = 0;
1812 /* Setup important stuff for command line editing. */
1813 rl_completion_word_break_hook = gdb_completion_word_break_characters;
1814 rl_completion_entry_function = readline_line_completion_function;
1815 rl_completer_word_break_characters = default_word_break_characters ();
1816 rl_completer_quote_characters = get_gdb_completer_quote_characters ();
1817 rl_completion_display_matches_hook = cli_display_match_list;
1818 rl_readline_name = "gdb";
1819 rl_terminal_name = getenv ("TERM");
1821 /* The name for this defun comes from Bash, where it originated.
1822 15 is Control-o, the same binding this function has in Bash. */
1823 rl_add_defun ("operate-and-get-next", gdb_rl_operate_and_get_next, 15);
1825 add_setshow_string_cmd ("prompt", class_support,
1827 _("Set gdb's prompt"),
1828 _("Show gdb's prompt"),
1831 &setlist, &showlist);
1833 add_com ("dont-repeat", class_support, dont_repeat_command, _("\
1834 Don't repeat this command.\nPrimarily \
1835 used inside of user-defined commands that should not be repeated when\n\
1838 add_setshow_boolean_cmd ("editing", class_support,
1839 &async_command_editing_p, _("\
1840 Set editing of command lines as they are typed."), _("\
1841 Show editing of command lines as they are typed."), _("\
1842 Use \"on\" to enable the editing, and \"off\" to disable it.\n\
1843 Without an argument, command line editing is enabled. To edit, use\n\
1844 EMACS-like or VI-like commands like control-P or ESC."),
1845 set_async_editing_command,
1846 show_async_command_editing_p,
1847 &setlist, &showlist);
1849 add_setshow_boolean_cmd ("save", no_class, &write_history_p, _("\
1850 Set saving of the history record on exit."), _("\
1851 Show saving of the history record on exit."), _("\
1852 Use \"on\" to enable the saving, and \"off\" to disable it.\n\
1853 Without an argument, saving is enabled."),
1855 show_write_history_p,
1856 &sethistlist, &showhistlist);
1858 add_setshow_zuinteger_unlimited_cmd ("size", no_class,
1859 &history_size_setshow_var, _("\
1860 Set the size of the command history,"), _("\
1861 Show the size of the command history,"), _("\
1862 ie. the number of previous commands to keep a record of.\n\
1863 If set to \"unlimited\", the number of commands kept in the history\n\
1864 list is unlimited. This defaults to the value of the environment\n\
1865 variable \"GDBHISTSIZE\", or to 256 if this variable is not set."),
1866 set_history_size_command,
1868 &sethistlist, &showhistlist);
1870 add_setshow_zuinteger_unlimited_cmd ("remove-duplicates", no_class,
1871 &history_remove_duplicates, _("\
1872 Set how far back in history to look for and remove duplicate entries."), _("\
1873 Show how far back in history to look for and remove duplicate entries."), _("\
1874 If set to a nonzero value N, GDB will look back at the last N history entries\n\
1875 and remove the first history entry that is a duplicate of the most recent\n\
1876 entry, each time a new history entry is added.\n\
1877 If set to \"unlimited\", this lookbehind is unbounded.\n\
1878 Only history entries added during this session are considered for removal.\n\
1879 If set to 0, removal of duplicate history entries is disabled.\n\
1880 By default this option is set to 0."),
1882 show_history_remove_duplicates,
1883 &sethistlist, &showhistlist);
1885 add_setshow_filename_cmd ("filename", no_class, &history_filename, _("\
1886 Set the filename in which to record the command history"), _("\
1887 Show the filename in which to record the command history"), _("\
1888 (the list of previous commands of which a record is kept)."),
1889 set_history_filename,
1890 show_history_filename,
1891 &sethistlist, &showhistlist);
1893 add_setshow_boolean_cmd ("confirm", class_support, &confirm, _("\
1894 Set whether to confirm potentially dangerous operations."), _("\
1895 Show whether to confirm potentially dangerous operations."), NULL,
1898 &setlist, &showlist);
1900 add_setshow_zinteger_cmd ("annotate", class_obscure, &annotation_level, _("\
1901 Set annotation_level."), _("\
1902 Show annotation_level."), _("\
1903 0 == normal; 1 == fullname (for use when running under emacs)\n\
1904 2 == output annotated suitably for use by programs that control GDB."),
1906 show_annotation_level,
1907 &setlist, &showlist);
1909 add_setshow_boolean_cmd ("exec-done-display", class_support,
1910 &exec_done_display_p, _("\
1911 Set notification of completion for asynchronous execution commands."), _("\
1912 Show notification of completion for asynchronous execution commands."), _("\
1913 Use \"on\" to enable the notification, and \"off\" to disable it."),
1915 show_exec_done_display_p,
1916 &setlist, &showlist);
1918 add_setshow_filename_cmd ("data-directory", class_maintenance,
1919 &staged_gdb_datadir, _("Set GDB's data directory."),
1920 _("Show GDB's data directory."),
1922 When set, GDB uses the specified path to search for data files."),
1923 set_gdb_datadir, show_gdb_datadir,
1929 gdb_init (char *argv0)
1931 if (pre_init_ui_hook)
1932 pre_init_ui_hook ();
1934 /* Run the init function of each source file. */
1937 /* Make sure we return to the original directory upon exit, come
1938 what may, since the OS doesn't do that for us. */
1939 make_final_cleanup (do_chdir_cleanup, xstrdup (current_directory));
1942 init_cmd_lists (); /* This needs to be done first. */
1943 initialize_targets (); /* Setup target_terminal macros for utils.c. */
1944 initialize_utils (); /* Make errors and warnings possible. */
1948 /* Here is where we call all the _initialize_foo routines. */
1949 initialize_all_files ();
1951 /* This creates the current_program_space. Do this after all the
1952 _initialize_foo routines have had a chance to install their
1953 per-sspace data keys. Also do this before
1954 initialize_current_architecture is called, because it accesses
1955 exec_bfd of the current program space. */
1956 initialize_progspace ();
1957 initialize_inferiors ();
1958 initialize_current_architecture ();
1960 init_main (); /* But that omits this file! Do it now. */
1962 initialize_stdin_serial ();
1964 /* Take a snapshot of our tty state before readline/ncurses have had a chance
1966 set_initial_gdb_ttystate ();
1968 async_init_signals ();
1970 /* We need a default language for parsing expressions, so simple
1971 things like "set width 0" won't fail if no language is explicitly
1972 set in a config file or implicitly set by reading an executable
1974 set_language (language_c);
1975 expected_language = current_language; /* Don't warn about the change. */
1977 /* Python initialization, for example, can require various commands to be
1978 installed. For example "info pretty-printer" needs the "info"
1979 prefix to be installed. Keep things simple and just do final
1980 script initialization here. */
1981 finish_ext_lang_initialization ();