1 /* Top level stuff for GDB, the GNU debugger.
3 Copyright (C) 1986-2014 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"
29 #include "exceptions.h"
32 #include "target-dcache.h"
33 #include "breakpoint.h"
35 #include "expression.h"
38 #include "terminal.h" /* For job_control. */
40 #include "completer.h"
45 #include "gdb_assert.h"
47 #include "event-loop.h"
48 #include "gdbthread.h"
49 #include "extension.h"
53 #include "filenames.h"
55 /* readline include files. */
56 #include "readline/readline.h"
57 #include "readline/history.h"
59 /* readline defines this. */
62 #include <sys/types.h>
64 #include "event-top.h"
70 #include "tracepoint.h"
72 extern void initialize_all_files (void);
74 #define PROMPT(X) the_prompts.prompt_stack[the_prompts.top + X].prompt
75 #define PREFIX(X) the_prompts.prompt_stack[the_prompts.top + X].prefix
76 #define SUFFIX(X) the_prompts.prompt_stack[the_prompts.top + X].suffix
78 /* Default command line prompt. This is overriden in some configs. */
80 #ifndef DEFAULT_PROMPT
81 #define DEFAULT_PROMPT "(gdb) "
84 /* Initialization file name for gdb. This is host-dependent. */
86 const char gdbinit[] = GDBINIT;
88 int inhibit_gdbinit = 0;
90 extern char lang_frame_mismatch_warn[]; /* language.c */
92 /* Flag for whether we want to confirm potentially dangerous
93 operations. Default is yes. */
98 show_confirm (struct ui_file *file, int from_tty,
99 struct cmd_list_element *c, const char *value)
101 fprintf_filtered (file, _("Whether to confirm potentially "
102 "dangerous operations is %s.\n"),
106 /* stdio stream that command input is being read from. Set to stdin
107 normally. Set by source_command to the file we are sourcing. Set
108 to NULL if we are executing a user-defined command or interacting
113 /* Flag to indicate whether a user defined command is currently running. */
117 /* Current working directory. */
119 char *current_directory;
121 /* The directory name is actually stored here (usually). */
122 char gdb_dirbuf[1024];
124 /* Function to call before reading a command, if nonzero.
125 The function receives two args: an input stream,
126 and a prompt string. */
128 void (*window_hook) (FILE *, char *);
130 /* Buffer used for reading command lines, and the size
131 allocated for it so far. */
133 char *saved_command_line;
134 int saved_command_line_size = 100;
136 /* Nonzero if the current command is modified by "server ". This
137 affects things like recording into the command history, commands
138 repeating on RETURN, etc. This is so a user interface (emacs, GUI,
139 whatever) can issue its own commands and also send along commands
140 from the user, and have the user not notice that the user interface
141 is issuing commands too. */
144 /* Timeout limit for response from target. */
146 /* The default value has been changed many times over the years. It
147 was originally 5 seconds. But that was thought to be a long time
148 to sit and wait, so it was changed to 2 seconds. That was thought
149 to be plenty unless the connection was going through some terminal
150 server or multiplexer or other form of hairy serial connection.
152 In mid-1996, remote_timeout was moved from remote.c to top.c and
153 it began being used in other remote-* targets. It appears that the
154 default was changed to 20 seconds at that time, perhaps because the
155 Renesas E7000 ICE didn't always respond in a timely manner.
157 But if 5 seconds is a long time to sit and wait for retransmissions,
158 20 seconds is far worse. This demonstrates the difficulty of using
159 a single variable for all protocol timeouts.
161 As remote.c is used much more than remote-e7000.c, it was changed
162 back to 2 seconds in 1999. */
164 int remote_timeout = 2;
166 /* Non-zero tells remote* modules to output debugging info. */
168 int remote_debug = 0;
170 /* Sbrk location on entry to main. Used for statistics only. */
175 /* Hooks for alternate command interfaces. */
177 /* Called after most modules have been initialized, but before taking
180 If the UI fails to initialize and it wants GDB to continue using
181 the default UI, then it should clear this hook before returning. */
183 void (*deprecated_init_ui_hook) (char *argv0);
185 /* This hook is called from within gdb's many mini-event loops which
186 could steal control from a real user interface's event loop. It
187 returns non-zero if the user is requesting a detach, zero
190 int (*deprecated_ui_loop_hook) (int);
193 /* Called from print_frame_info to list the line we stopped in. */
195 void (*deprecated_print_frame_info_listing_hook) (struct symtab * s,
199 /* Replaces most of query. */
201 int (*deprecated_query_hook) (const char *, va_list);
203 /* Replaces most of warning. */
205 void (*deprecated_warning_hook) (const char *, va_list);
207 /* These three functions support getting lines of text from the user.
208 They are used in sequence. First deprecated_readline_begin_hook is
209 called with a text string that might be (for example) a message for
210 the user to type in a sequence of commands to be executed at a
211 breakpoint. If this function calls back to a GUI, it might take
212 this opportunity to pop up a text interaction window with this
213 message. Next, deprecated_readline_hook is called with a prompt
214 that is emitted prior to collecting the user input. It can be
215 called multiple times. Finally, deprecated_readline_end_hook is
216 called to notify the GUI that we are done with the interaction
217 window and it can close it. */
219 void (*deprecated_readline_begin_hook) (char *, ...);
220 char *(*deprecated_readline_hook) (char *);
221 void (*deprecated_readline_end_hook) (void);
223 /* Called as appropriate to notify the interface that we have attached
224 to or detached from an already running process. */
226 void (*deprecated_attach_hook) (void);
227 void (*deprecated_detach_hook) (void);
229 /* Called during long calculations to allow GUI to repair window
230 damage, and to check for stop buttons, etc... */
232 void (*deprecated_interactive_hook) (void);
234 /* Tell the GUI someone changed the register REGNO. -1 means
235 that the caller does not know which register changed or
236 that several registers have changed (see value_assign). */
237 void (*deprecated_register_changed_hook) (int regno);
239 /* Called when going to wait for the target. Usually allows the GUI
240 to run while waiting for target events. */
242 ptid_t (*deprecated_target_wait_hook) (ptid_t ptid,
243 struct target_waitstatus *status,
246 /* Used by UI as a wrapper around command execution. May do various
247 things like enabling/disabling buttons, etc... */
249 void (*deprecated_call_command_hook) (struct cmd_list_element * c,
250 char *cmd, int from_tty);
252 /* Called when the current thread changes. Argument is thread id. */
254 void (*deprecated_context_hook) (int id);
256 /* Handler for SIGHUP. */
259 /* NOTE 1999-04-29: This function will be static again, once we modify
260 gdb to use the event loop as the default command loop and we merge
261 event-top.c into this file, top.c. */
265 /* Stop asking user for confirmation --- we're exiting. This
266 prevents asking the user dumb questions. */
268 quit_command ((char *) 0, 0);
270 #endif /* defined SIGHUP */
272 /* Line number we are currently in, in a file which is being sourced. */
273 /* NOTE 1999-04-29: This variable will be static again, once we modify
274 gdb to use the event loop as the default command loop and we merge
275 event-top.c into this file, top.c. */
276 /* static */ int source_line_number;
278 /* Name of the file we are sourcing. */
279 /* NOTE 1999-04-29: This variable will be static again, once we modify
280 gdb to use the event loop as the default command loop and we merge
281 event-top.c into this file, top.c. */
282 /* static */ const char *source_file_name;
284 /* Clean up on error during a "source" command (or execution of a
285 user-defined command). */
288 do_restore_instream_cleanup (void *stream)
290 /* Restore the previous input stream. */
294 /* Read commands from STREAM. */
296 read_command_file (FILE *stream)
298 struct cleanup *cleanups;
300 cleanups = make_cleanup (do_restore_instream_cleanup, instream);
303 do_cleanups (cleanups);
306 void (*pre_init_ui_hook) (void);
310 do_chdir_cleanup (void *old_dir)
318 prepare_execute_command (void)
321 struct cleanup *cleanup;
323 mark = value_mark ();
324 cleanup = make_cleanup_value_free_to_mark (mark);
326 /* With multiple threads running while the one we're examining is
327 stopped, the dcache can get stale without us being able to detect
328 it. For the duration of the command, though, use the dcache to
329 help things like backtrace. */
331 target_dcache_invalidate ();
336 /* Tell the user if the language has changed (except first time) after
337 executing a command. */
340 check_frame_language_change (void)
342 static int warned = 0;
344 /* First make sure that a new frame has been selected, in case the
345 command or the hooks changed the program state. */
346 deprecated_safe_get_selected_frame ();
347 if (current_language != expected_language)
349 if (language_mode == language_mode_auto && info_verbose)
351 language_info (1); /* Print what changed. */
356 /* Warn the user if the working language does not match the language
357 of the current frame. Only warn the user if we are actually
358 running the program, i.e. there is a stack. */
359 /* FIXME: This should be cacheing the frame and only running when
360 the frame changes. */
362 if (has_stack_frames ())
366 flang = get_frame_language ();
368 && flang != language_unknown
369 && flang != current_language->la_language)
371 printf_filtered ("%s\n", lang_frame_mismatch_warn);
377 /* Execute the line P as a command, in the current user context.
378 Pass FROM_TTY as second argument to the defining function. */
381 execute_command (char *p, int from_tty)
383 struct cleanup *cleanup_if_error, *cleanup;
384 struct cmd_list_element *c;
387 cleanup_if_error = make_bpstat_clear_actions_cleanup ();
388 cleanup = prepare_execute_command ();
390 /* Force cleanup of any alloca areas if using C alloca instead of
394 /* This can happen when command_line_input hits end of file. */
397 do_cleanups (cleanup);
398 discard_cleanups (cleanup_if_error);
402 target_log_command (p);
404 while (*p == ' ' || *p == '\t')
410 int was_sync = sync_execution;
414 /* If trace-commands is set then this will print this command. */
415 print_command_trace (p);
417 c = lookup_cmd (&cmd, cmdlist, "", 0, 1);
420 /* Pass null arg rather than an empty one. */
423 /* FIXME: cagney/2002-02-02: The c->type test is pretty dodgy
424 while the is_complete_command(cfunc) test is just plain
425 bogus. They should both be replaced by a test of the form
426 c->strip_trailing_white_space_p. */
427 /* NOTE: cagney/2002-02-02: The function.cfunc in the below
428 can't be replaced with func. This is because it is the
429 cfunc, and not the func, that has the value that the
430 is_complete_command hack is testing for. */
431 /* Clear off trailing whitespace, except for set and complete
434 && c->type != set_cmd
435 && !is_complete_command (c))
437 p = arg + strlen (arg) - 1;
438 while (p >= arg && (*p == ' ' || *p == '\t'))
443 /* If this command has been pre-hooked, run the hook first. */
444 execute_cmd_pre_hook (c);
446 if (c->deprecated_warn_user)
447 deprecated_cmd_warning (line);
449 /* c->user_commands would be NULL in the case of a python command. */
450 if (c->class == class_user && c->user_commands)
451 execute_user_command (c, arg);
452 else if (c->type == set_cmd)
453 do_set_command (arg, from_tty, c);
454 else if (c->type == show_cmd)
455 do_show_command (arg, from_tty, c);
456 else if (!cmd_func_p (c))
457 error (_("That is not a command, just a help topic."));
458 else if (deprecated_call_command_hook)
459 deprecated_call_command_hook (c, arg, from_tty);
461 cmd_func (c, arg, from_tty);
463 /* If the interpreter is in sync mode (we're running a user
464 command's list, running command hooks or similars), and we
465 just ran a synchronous command that started the target, wait
466 for that command to end. */
467 if (!interpreter_async && !was_sync && sync_execution)
469 while (gdb_do_one_event () >= 0)
474 /* If this command has been post-hooked, run the hook last. */
475 execute_cmd_post_hook (c);
479 check_frame_language_change ();
481 do_cleanups (cleanup);
482 discard_cleanups (cleanup_if_error);
485 /* Run execute_command for P and FROM_TTY. Capture its output into the
486 returned string, do not display it to the screen. BATCH_FLAG will be
487 temporarily set to true. */
490 execute_command_to_string (char *p, int from_tty)
492 struct ui_file *str_file;
493 struct cleanup *cleanup;
496 /* GDB_STDOUT should be better already restored during these
497 restoration callbacks. */
498 cleanup = set_batch_flag_and_make_cleanup_restore_page_info ();
500 make_cleanup_restore_integer (&interpreter_async);
501 interpreter_async = 0;
503 str_file = mem_fileopen ();
505 make_cleanup_ui_file_delete (str_file);
506 make_cleanup_restore_ui_file (&gdb_stdout);
507 make_cleanup_restore_ui_file (&gdb_stderr);
508 make_cleanup_restore_ui_file (&gdb_stdlog);
509 make_cleanup_restore_ui_file (&gdb_stdtarg);
510 make_cleanup_restore_ui_file (&gdb_stdtargerr);
512 if (ui_out_redirect (current_uiout, str_file) < 0)
513 warning (_("Current output protocol does not support redirection"));
515 make_cleanup_ui_out_redirect_pop (current_uiout);
517 gdb_stdout = str_file;
518 gdb_stderr = str_file;
519 gdb_stdlog = str_file;
520 gdb_stdtarg = str_file;
521 gdb_stdtargerr = str_file;
523 execute_command (p, from_tty);
525 retval = ui_file_xstrdup (str_file, NULL);
527 do_cleanups (cleanup);
532 /* Read commands from `instream' and execute them
533 until end of file or error reading instream. */
538 struct cleanup *old_chain;
540 int stdin_is_tty = ISATTY (stdin);
542 while (instream && !feof (instream))
544 if (window_hook && instream == stdin)
545 (*window_hook) (instream, get_prompt ());
548 if (instream == stdin && stdin_is_tty)
549 reinitialize_more_filter ();
550 old_chain = make_cleanup (null_cleanup, 0);
552 /* Get a command-line. This calls the readline package. */
553 command = command_line_input (instream == stdin ?
554 get_prompt () : (char *) NULL,
555 instream == stdin, "prompt");
558 do_cleanups (old_chain);
562 make_command_stats_cleanup (1);
564 /* Do not execute commented lines. */
565 if (command[0] != '#')
567 execute_command (command, instream == stdin);
569 /* Do any commands attached to breakpoint we are stopped at. */
570 bpstat_do_actions ();
572 do_cleanups (old_chain);
576 /* When nonzero, cause dont_repeat to do nothing. This should only be
577 set via prevent_dont_repeat. */
579 static int suppress_dont_repeat = 0;
581 /* Commands call this if they do not want to be repeated by null lines. */
586 if (suppress_dont_repeat || server_command)
589 /* If we aren't reading from standard input, we are saving the last
590 thing read from stdin in line and don't want to delete it. Null
591 lines won't repeat here in any case. */
592 if (instream == stdin)
593 *saved_command_line = 0;
596 /* Prevent dont_repeat from working, and return a cleanup that
597 restores the previous state. */
600 prevent_dont_repeat (void)
602 struct cleanup *result = make_cleanup_restore_integer (&suppress_dont_repeat);
604 suppress_dont_repeat = 1;
609 /* Read a line from the stream "instream" without command line editing.
611 It prints PROMPT_ARG once at the start.
612 Action is compatible with "readline", e.g. space for the result is
613 malloc'd and should be freed by the caller.
615 A NULL return means end of file. */
617 gdb_readline (char *prompt_arg)
622 int result_size = 80;
626 /* Don't use a _filtered function here. It causes the assumed
627 character position to be off, since the newline we read from
628 the user is not accounted for. */
629 fputs_unfiltered (prompt_arg, gdb_stdout);
630 gdb_flush (gdb_stdout);
633 result = (char *) xmalloc (result_size);
637 /* Read from stdin if we are executing a user defined command.
638 This is the right thing for prompt_for_continue, at least. */
639 c = fgetc (instream ? instream : stdin);
644 /* The last line does not end with a newline. Return it, and
645 if we are called again fgetc will still return EOF and
646 we'll return NULL then. */
654 if (input_index > 0 && result[input_index - 1] == '\r')
659 result[input_index++] = c;
660 while (input_index >= result_size)
663 result = (char *) xrealloc (result, result_size);
667 result[input_index++] = '\0';
671 /* Variables which control command line editing and history
672 substitution. These variables are given default values at the end
674 static int command_editing_p;
676 /* NOTE 1999-04-29: This variable will be static again, once we modify
677 gdb to use the event loop as the default command loop and we merge
678 event-top.c into this file, top.c. */
680 /* static */ int history_expansion_p;
682 static int write_history_p;
684 show_write_history_p (struct ui_file *file, int from_tty,
685 struct cmd_list_element *c, const char *value)
687 fprintf_filtered (file, _("Saving of the history record on exit is %s.\n"),
691 /* The variable associated with the "set/show history size"
693 static unsigned int history_size_setshow_var;
696 show_history_size (struct ui_file *file, int from_tty,
697 struct cmd_list_element *c, const char *value)
699 fprintf_filtered (file, _("The size of the command history is %s.\n"),
703 static char *history_filename;
705 show_history_filename (struct ui_file *file, int from_tty,
706 struct cmd_list_element *c, const char *value)
708 fprintf_filtered (file, _("The filename in which to record "
709 "the command history is \"%s\".\n"),
713 /* This is like readline(), but it has some gdb-specific behavior.
714 gdb may want readline in both the synchronous and async modes during
715 a single gdb invocation. At the ordinary top-level prompt we might
716 be using the async readline. That means we can't use
717 rl_pre_input_hook, since it doesn't work properly in async mode.
718 However, for a secondary prompt (" >", such as occurs during a
719 `define'), gdb wants a synchronous response.
721 We used to call readline() directly, running it in synchronous
722 mode. But mixing modes this way is not supported, and as of
723 readline 5.x it no longer works; the arrow keys come unbound during
724 the synchronous call. So we make a nested call into the event
725 loop. That's what gdb_readline_wrapper is for. */
727 /* A flag set as soon as gdb_readline_wrapper_line is called; we can't
728 rely on gdb_readline_wrapper_result, which might still be NULL if
729 the user types Control-D for EOF. */
730 static int gdb_readline_wrapper_done;
732 /* The result of the current call to gdb_readline_wrapper, once a newline
734 static char *gdb_readline_wrapper_result;
736 /* Any intercepted hook. Operate-and-get-next sets this, expecting it
737 to be called after the newline is processed (which will redisplay
738 the prompt). But in gdb_readline_wrapper we will not get a new
739 prompt until the next call, or until we return to the event loop.
740 So we disable this hook around the newline and restore it before we
742 static void (*saved_after_char_processing_hook) (void);
744 /* This function is called when readline has seen a complete line of
748 gdb_readline_wrapper_line (char *line)
750 gdb_assert (!gdb_readline_wrapper_done);
751 gdb_readline_wrapper_result = line;
752 gdb_readline_wrapper_done = 1;
754 /* Prevent operate-and-get-next from acting too early. */
755 saved_after_char_processing_hook = after_char_processing_hook;
756 after_char_processing_hook = NULL;
758 /* Prevent parts of the prompt from being redisplayed if annotations
759 are enabled, and readline's state getting out of sync. We'll
760 restore it in gdb_readline_wrapper_cleanup. */
761 if (async_command_editing_p)
762 rl_callback_handler_remove ();
765 struct gdb_readline_wrapper_cleanup
767 void (*handler_orig) (char *);
768 int already_prompted_orig;
772 gdb_readline_wrapper_cleanup (void *arg)
774 struct gdb_readline_wrapper_cleanup *cleanup = arg;
776 rl_already_prompted = cleanup->already_prompted_orig;
778 gdb_assert (input_handler == gdb_readline_wrapper_line);
779 input_handler = cleanup->handler_orig;
781 /* Reinstall INPUT_HANDLER in readline, without displaying a
783 if (async_command_editing_p)
784 rl_callback_handler_install (NULL, input_handler);
786 gdb_readline_wrapper_result = NULL;
787 gdb_readline_wrapper_done = 0;
789 after_char_processing_hook = saved_after_char_processing_hook;
790 saved_after_char_processing_hook = NULL;
796 gdb_readline_wrapper (char *prompt)
798 struct cleanup *back_to;
799 struct gdb_readline_wrapper_cleanup *cleanup;
802 cleanup = xmalloc (sizeof (*cleanup));
803 cleanup->handler_orig = input_handler;
804 input_handler = gdb_readline_wrapper_line;
806 cleanup->already_prompted_orig = rl_already_prompted;
808 back_to = make_cleanup (gdb_readline_wrapper_cleanup, cleanup);
810 /* Display our prompt and prevent double prompt display. */
811 display_gdb_prompt (prompt);
812 rl_already_prompted = 1;
814 if (after_char_processing_hook)
815 (*after_char_processing_hook) ();
816 gdb_assert (after_char_processing_hook == NULL);
818 while (gdb_do_one_event () >= 0)
819 if (gdb_readline_wrapper_done)
822 retval = gdb_readline_wrapper_result;
823 do_cleanups (back_to);
828 /* The current saved history number from operate-and-get-next.
829 This is -1 if not valid. */
830 static int operate_saved_history = -1;
832 /* This is put on the appropriate hook and helps operate-and-get-next
835 gdb_rl_operate_and_get_next_completion (void)
837 int delta = where_history () - operate_saved_history;
839 /* The `key' argument to rl_get_previous_history is ignored. */
840 rl_get_previous_history (delta, 0);
841 operate_saved_history = -1;
843 /* readline doesn't automatically update the display for us. */
846 after_char_processing_hook = NULL;
847 rl_pre_input_hook = NULL;
850 /* This is a gdb-local readline command handler. It accepts the
851 current command line (like RET does) and, if this command was taken
852 from the history, arranges for the next command in the history to
853 appear on the command line when the prompt returns.
854 We ignore the arguments. */
856 gdb_rl_operate_and_get_next (int count, int key)
860 /* Use the async hook. */
861 after_char_processing_hook = gdb_rl_operate_and_get_next_completion;
863 /* Find the current line, and find the next line to use. */
864 where = where_history();
866 if ((history_is_stifled () && (history_length >= history_max_entries))
867 || (where >= history_length - 1))
868 operate_saved_history = where;
870 operate_saved_history = where + 1;
872 return rl_newline (1, key);
875 /* Read one line from the command input stream `instream'
876 into the local static buffer `linebuffer' (whose current length
878 The buffer is made bigger as necessary.
879 Returns the address of the start of the line.
881 NULL is returned for end of file.
883 *If* the instream == stdin & stdin is a terminal, the line read
884 is copied into the file line saver (global var char *line,
885 length linesize) so that it can be duplicated.
887 This routine either uses fancy command line editing or
888 simple input as the user has requested. */
891 command_line_input (char *prompt_arg, int repeat, char *annotation_suffix)
893 static char *linebuffer = 0;
894 static unsigned linelength = 0;
898 char *local_prompt = prompt_arg;
902 /* The annotation suffix must be non-NULL. */
903 if (annotation_suffix == NULL)
904 annotation_suffix = "";
906 if (annotation_level > 1 && instream == stdin)
908 local_prompt = alloca ((prompt_arg == NULL ? 0 : strlen (prompt_arg))
909 + strlen (annotation_suffix) + 40);
910 if (prompt_arg == NULL)
911 local_prompt[0] = '\0';
913 strcpy (local_prompt, prompt_arg);
914 strcat (local_prompt, "\n\032\032");
915 strcat (local_prompt, annotation_suffix);
916 strcat (local_prompt, "\n");
922 linebuffer = (char *) xmalloc (linelength);
927 /* Control-C quits instantly if typed while in this loop
928 since it should not wait until the user types a newline. */
933 signal (STOP_SIGNAL, handle_stop_sig);
938 /* Make sure that all output has been output. Some machines may
939 let you get away with leaving out some of the gdb_flush, but
942 gdb_flush (gdb_stdout);
943 gdb_flush (gdb_stderr);
945 if (source_file_name != NULL)
946 ++source_line_number;
948 if (annotation_level > 1 && instream == stdin)
950 puts_unfiltered ("\n\032\032pre-");
951 puts_unfiltered (annotation_suffix);
952 puts_unfiltered ("\n");
955 /* Don't use fancy stuff if not talking to stdin. */
956 if (deprecated_readline_hook && input_from_terminal_p ())
958 rl = (*deprecated_readline_hook) (local_prompt);
960 else if (command_editing_p && input_from_terminal_p ())
962 rl = gdb_readline_wrapper (local_prompt);
966 rl = gdb_readline (local_prompt);
969 if (annotation_level > 1 && instream == stdin)
971 puts_unfiltered ("\n\032\032post-");
972 puts_unfiltered (annotation_suffix);
973 puts_unfiltered ("\n");
976 if (!rl || rl == (char *) EOF)
981 if (strlen (rl) + 1 + (p - linebuffer) > linelength)
983 linelength = strlen (rl) + 1 + (p - linebuffer);
984 nline = (char *) xrealloc (linebuffer, linelength);
985 p += nline - linebuffer;
989 /* Copy line. Don't copy null at end. (Leaves line alone
990 if this was just a newline). */
994 xfree (rl); /* Allocated in readline. */
996 if (p == linebuffer || *(p - 1) != '\\')
999 p--; /* Put on top of '\'. */
1000 local_prompt = (char *) 0;
1005 signal (STOP_SIGNAL, SIG_DFL);
1012 #define SERVER_COMMAND_LENGTH 7
1014 (p - linebuffer > SERVER_COMMAND_LENGTH)
1015 && strncmp (linebuffer, "server ", SERVER_COMMAND_LENGTH) == 0;
1018 /* Note that we don't set `line'. Between this and the check in
1019 dont_repeat, this insures that repeating will still do the
1022 return linebuffer + SERVER_COMMAND_LENGTH;
1025 /* Do history expansion if that is wished. */
1026 if (history_expansion_p && instream == stdin
1027 && ISATTY (instream))
1029 char *history_value;
1032 *p = '\0'; /* Insert null now. */
1033 expanded = history_expand (linebuffer, &history_value);
1036 /* Print the changes. */
1037 printf_unfiltered ("%s\n", history_value);
1039 /* If there was an error, call this function again. */
1042 xfree (history_value);
1043 return command_line_input (prompt_arg, repeat,
1046 if (strlen (history_value) > linelength)
1048 linelength = strlen (history_value) + 1;
1049 linebuffer = (char *) xrealloc (linebuffer, linelength);
1051 strcpy (linebuffer, history_value);
1052 p = linebuffer + strlen (linebuffer);
1054 xfree (history_value);
1057 /* If we just got an empty line, and that is supposed to repeat the
1058 previous command, return the value in the global buffer. */
1059 if (repeat && p == linebuffer)
1060 return saved_command_line;
1061 for (p1 = linebuffer; *p1 == ' ' || *p1 == '\t'; p1++);
1063 return saved_command_line;
1067 /* Add line to history if appropriate. */
1068 if (*linebuffer && input_from_terminal_p ())
1069 add_history (linebuffer);
1071 /* Save into global buffer if appropriate. */
1074 if (linelength > saved_command_line_size)
1076 saved_command_line = xrealloc (saved_command_line, linelength);
1077 saved_command_line_size = linelength;
1079 strcpy (saved_command_line, linebuffer);
1080 return saved_command_line;
1086 /* Print the GDB banner. */
1088 print_gdb_version (struct ui_file *stream)
1090 /* From GNU coding standards, first line is meant to be easy for a
1091 program to parse, and is just canonical program name and version
1092 number, which starts after last space. */
1094 fprintf_filtered (stream, "GNU gdb %s%s\n", PKGVERSION, version);
1096 /* Second line is a copyright notice. */
1098 fprintf_filtered (stream,
1099 "Copyright (C) 2014 Free Software Foundation, Inc.\n");
1101 /* Following the copyright is a brief statement that the program is
1102 free software, that users are free to copy and change it on
1103 certain conditions, that it is covered by the GNU GPL, and that
1104 there is no warranty. */
1106 fprintf_filtered (stream, "\
1107 License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>\
1108 \nThis is free software: you are free to change and redistribute it.\n\
1109 There is NO WARRANTY, to the extent permitted by law. Type \"show copying\"\n\
1110 and \"show warranty\" for details.\n");
1112 /* After the required info we print the configuration information. */
1114 fprintf_filtered (stream, "This GDB was configured as \"");
1115 if (strcmp (host_name, target_name) != 0)
1117 fprintf_filtered (stream, "--host=%s --target=%s",
1118 host_name, target_name);
1122 fprintf_filtered (stream, "%s", host_name);
1124 fprintf_filtered (stream, "\".\n\
1125 Type \"show configuration\" for configuration details.");
1127 if (REPORT_BUGS_TO[0])
1129 fprintf_filtered (stream,
1130 _("\nFor bug reporting instructions, please see:\n"));
1131 fprintf_filtered (stream, "%s.\n", REPORT_BUGS_TO);
1133 fprintf_filtered (stream,
1134 _("Find the GDB manual and other documentation \
1135 resources online at:\n<http://www.gnu.org/software/gdb/documentation/>.\n"));
1136 fprintf_filtered (stream, _("For help, type \"help\".\n"));
1137 fprintf_filtered (stream, _("Type \"apropos word\" to search for \
1138 commands related to \"word\"."));
1141 /* Print the details of GDB build-time configuration. */
1143 print_gdb_configuration (struct ui_file *stream)
1145 fprintf_filtered (stream, _("\
1146 This GDB was configured as follows:\n\
1147 configure --host=%s --target=%s\n\
1148 "), host_name, target_name);
1149 fprintf_filtered (stream, _("\
1150 --with-auto-load-dir=%s\n\
1151 --with-auto-load-safe-path=%s\n\
1152 "), AUTO_LOAD_DIR, AUTO_LOAD_SAFE_PATH);
1154 fprintf_filtered (stream, _("\
1158 fprintf_filtered (stream, _("\
1163 fprintf_filtered (stream, _("\
1164 --with-gdb-datadir=%s%s\n\
1165 "), GDB_DATADIR, GDB_DATADIR_RELOCATABLE ? " (relocatable)" : "");
1167 fprintf_filtered (stream, _("\
1168 --with-iconv-bin=%s%s\n\
1169 "), ICONV_BIN, ICONV_BIN_RELOCATABLE ? " (relocatable)" : "");
1171 if (JIT_READER_DIR[0])
1172 fprintf_filtered (stream, _("\
1173 --with-jit-reader-dir=%s%s\n\
1174 "), JIT_READER_DIR, JIT_READER_DIR_RELOCATABLE ? " (relocatable)" : "");
1175 #if HAVE_LIBUNWIND_IA64_H
1176 fprintf_filtered (stream, _("\
1177 --with-libunwind-ia64\n\
1180 fprintf_filtered (stream, _("\
1181 --without-libunwind-ia64\n\
1185 fprintf_filtered (stream, _("\
1189 fprintf_filtered (stream, _("\
1193 #ifdef WITH_PYTHON_PATH
1194 fprintf_filtered (stream, _("\
1195 --with-python=%s%s\n\
1196 "), WITH_PYTHON_PATH, PYTHON_PATH_RELOCATABLE ? " (relocatable)" : "");
1199 fprintf_filtered (stream, _("\
1203 fprintf_filtered (stream, _("\
1208 fprintf_filtered (stream, _("\
1209 --with-relocated-sources=%s\n\
1213 fprintf_filtered (stream, _("\
1214 --with-separate-debug-dir=%s%s\n\
1215 "), DEBUGDIR, DEBUGDIR_RELOCATABLE ? " (relocatable)" : "");
1216 if (TARGET_SYSTEM_ROOT[0])
1217 fprintf_filtered (stream, _("\
1218 --with-sysroot=%s%s\n\
1219 "), TARGET_SYSTEM_ROOT, TARGET_SYSTEM_ROOT_RELOCATABLE ? " (relocatable)" : "");
1220 if (SYSTEM_GDBINIT[0])
1221 fprintf_filtered (stream, _("\
1222 --with-system-gdbinit=%s%s\n\
1223 "), SYSTEM_GDBINIT, SYSTEM_GDBINIT_RELOCATABLE ? " (relocatable)" : "");
1225 fprintf_filtered (stream, _("\
1229 fprintf_filtered (stream, _("\
1233 #if HAVE_LIBBABELTRACE
1234 fprintf_filtered (stream, _("\
1235 --with-babeltrace\n\
1238 fprintf_filtered (stream, _("\
1239 --without-babeltrace\n\
1242 /* We assume "relocatable" will be printed at least once, thus we always
1243 print this text. It's a reasonably safe assumption for now. */
1244 fprintf_filtered (stream, _("\n\
1245 (\"Relocatable\" means the directory can be moved with the GDB installation\n\
1246 tree, and GDB will still find it.)\n\
1251 /* The current top level prompt, settable with "set prompt", and/or
1252 with the python `gdb.prompt_hook' hook. */
1253 static char *top_prompt;
1255 /* Access method for the GDB prompt string. */
1263 /* Set method for the GDB prompt string. */
1266 set_prompt (const char *s)
1268 char *p = xstrdup (s);
1281 /* Callback for iterate_over_inferiors. Kills or detaches the given
1282 inferior, depending on how we originally gained control of it. */
1285 kill_or_detach (struct inferior *inf, void *args)
1287 struct qt_args *qt = args;
1288 struct thread_info *thread;
1293 thread = any_thread_of_process (inf->pid);
1296 switch_to_thread (thread->ptid);
1298 /* Leave core files alone. */
1299 if (target_has_execution)
1301 if (inf->attach_flag)
1302 target_detach (qt->args, qt->from_tty);
1311 /* Callback for iterate_over_inferiors. Prints info about what GDB
1312 will do to each inferior on a "quit". ARG points to a struct
1313 ui_out where output is to be collected. */
1316 print_inferior_quit_action (struct inferior *inf, void *arg)
1318 struct ui_file *stb = arg;
1323 if (inf->attach_flag)
1324 fprintf_filtered (stb,
1325 _("\tInferior %d [%s] will be detached.\n"), inf->num,
1326 target_pid_to_str (pid_to_ptid (inf->pid)));
1328 fprintf_filtered (stb,
1329 _("\tInferior %d [%s] will be killed.\n"), inf->num,
1330 target_pid_to_str (pid_to_ptid (inf->pid)));
1335 /* If necessary, make the user confirm that we should quit. Return
1336 non-zero if we should quit, zero if we shouldn't. */
1341 struct ui_file *stb;
1342 struct cleanup *old_chain;
1346 /* Don't even ask if we're only debugging a core file inferior. */
1347 if (!have_live_inferiors ())
1350 /* Build the query string as a single string. */
1351 stb = mem_fileopen ();
1352 old_chain = make_cleanup_ui_file_delete (stb);
1354 fprintf_filtered (stb, _("A debugging session is active.\n\n"));
1355 iterate_over_inferiors (print_inferior_quit_action, stb);
1356 fprintf_filtered (stb, _("\nQuit anyway? "));
1358 str = ui_file_xstrdup (stb, NULL);
1359 make_cleanup (xfree, str);
1361 qr = query ("%s", str);
1362 do_cleanups (old_chain);
1366 /* Quit without asking for confirmation. */
1369 quit_force (char *args, int from_tty)
1373 volatile struct gdb_exception ex;
1375 /* An optional expression may be used to cause gdb to terminate with the
1376 value of that expression. */
1379 struct value *val = parse_and_eval (args);
1381 exit_code = (int) value_as_long (val);
1383 else if (return_child_result)
1384 exit_code = return_child_result_value;
1387 qt.from_tty = from_tty;
1389 /* Wrappers to make the code below a bit more readable. */
1391 TRY_CATCH (ex, RETURN_MASK_ALL)
1393 #define DO_PRINT_EX \
1394 if (ex.reason < 0) \
1395 exception_print (gdb_stderr, ex)
1397 /* We want to handle any quit errors and exit regardless. */
1399 /* Get out of tfind mode, and kill or detach all inferiors. */
1402 disconnect_tracing ();
1403 iterate_over_inferiors (kill_or_detach, &qt);
1407 /* Give all pushed targets a chance to do minimal cleanup, and pop
1415 /* Save the history information if it is appropriate to do so. */
1418 if (write_history_p && history_filename
1419 && input_from_terminal_p ())
1420 write_history (history_filename);
1424 /* Do any final cleanups before exiting. */
1427 do_final_cleanups (all_cleanups ());
1434 /* Returns whether GDB is running on a terminal and input is
1435 currently coming from that terminal. */
1438 input_from_terminal_p (void)
1443 if (gdb_has_a_terminal () && instream == stdin)
1446 /* If INSTREAM is unset, and we are not in a user command, we
1447 must be in Insight. That's like having a terminal, for our
1449 if (instream == NULL && !in_user_command)
1456 dont_repeat_command (char *ignored, int from_tty)
1458 /* Can't call dont_repeat here because we're not necessarily reading
1460 *saved_command_line = 0;
1463 /* Functions to manipulate command line editing control variables. */
1465 /* Number of commands to print in each call to show_commands. */
1466 #define Hist_print 10
1468 show_commands (char *args, int from_tty)
1470 /* Index for history commands. Relative to history_base. */
1473 /* Number of the history entry which we are planning to display next.
1474 Relative to history_base. */
1477 /* Print out some of the commands from the command history. */
1481 if (args[0] == '+' && args[1] == '\0')
1482 /* "info editing +" should print from the stored position. */
1485 /* "info editing <exp>" should print around command number <exp>. */
1486 num = (parse_and_eval_long (args) - history_base) - Hist_print / 2;
1488 /* "show commands" means print the last Hist_print commands. */
1491 num = history_length - Hist_print;
1497 /* If there are at least Hist_print commands, we want to display the last
1498 Hist_print rather than, say, the last 6. */
1499 if (history_length - num < Hist_print)
1501 num = history_length - Hist_print;
1507 offset < num + Hist_print && offset < history_length;
1510 printf_filtered ("%5d %s\n", history_base + offset,
1511 (history_get (history_base + offset))->line);
1514 /* The next command we want to display is the next one that we haven't
1518 /* If the user repeats this command with return, it should do what
1519 "show commands +" does. This is unnecessary if arg is null,
1520 because "show commands +" is not useful after "show commands". */
1521 if (from_tty && args)
1528 /* Called by do_setshow_command. */
1530 set_history_size_command (char *args, int from_tty, struct cmd_list_element *c)
1532 /* Readline's history interface works with 'int', so it can only
1533 handle history sizes up to INT_MAX. The command itself is
1534 uinteger, so UINT_MAX means "unlimited", but we only get that if
1535 the user does "set history size 0" -- "set history size <UINT_MAX>"
1536 throws out-of-range. */
1537 if (history_size_setshow_var > INT_MAX
1538 && history_size_setshow_var != UINT_MAX)
1540 unsigned int new_value = history_size_setshow_var;
1542 /* Restore previous value before throwing. */
1543 if (history_is_stifled ())
1544 history_size_setshow_var = history_max_entries;
1546 history_size_setshow_var = UINT_MAX;
1548 error (_("integer %u out of range"), new_value);
1551 /* Commit the new value to readline's history. */
1552 if (history_size_setshow_var == UINT_MAX)
1553 unstifle_history ();
1555 stifle_history (history_size_setshow_var);
1559 set_history (char *args, int from_tty)
1561 printf_unfiltered (_("\"set history\" must be followed "
1562 "by the name of a history subcommand.\n"));
1563 help_list (sethistlist, "set history ", all_commands, gdb_stdout);
1567 show_history (char *args, int from_tty)
1569 cmd_show_list (showhistlist, from_tty, "");
1572 int info_verbose = 0; /* Default verbose msgs off. */
1574 /* Called by do_setshow_command. An elaborate joke. */
1576 set_verbose (char *args, int from_tty, struct cmd_list_element *c)
1578 const char *cmdname = "verbose";
1579 struct cmd_list_element *showcmd;
1581 showcmd = lookup_cmd_1 (&cmdname, showlist, NULL, 1);
1582 gdb_assert (showcmd != NULL && showcmd != CMD_LIST_AMBIGUOUS);
1586 c->doc = "Set verbose printing of informational messages.";
1587 showcmd->doc = "Show verbose printing of informational messages.";
1591 c->doc = "Set verbosity.";
1592 showcmd->doc = "Show verbosity.";
1596 /* Init the history buffer. Note that we are called after the init file(s)
1597 have been read so that the user can change the history file via his
1598 .gdbinit file (for instance). The GDBHISTFILE environment variable
1599 overrides all of this. */
1606 tmpenv = getenv ("HISTSIZE");
1611 var = atoi (tmpenv);
1614 /* Prefer ending up with no history rather than overflowing
1615 readline's history interface, which uses signed 'int'
1620 history_size_setshow_var = var;
1622 /* If the init file hasn't set a size yet, pick the default. */
1623 else if (history_size_setshow_var == 0)
1624 history_size_setshow_var = 256;
1626 /* Note that unlike "set history size 0", "HISTSIZE=0" really sets
1627 the history size to 0... */
1628 stifle_history (history_size_setshow_var);
1630 tmpenv = getenv ("GDBHISTFILE");
1632 history_filename = xstrdup (tmpenv);
1633 else if (!history_filename)
1635 /* We include the current directory so that if the user changes
1636 directories the file written will be the same as the one
1639 /* No leading dots in file names are allowed on MSDOS. */
1640 history_filename = concat (current_directory, "/_gdb_history",
1643 history_filename = concat (current_directory, "/.gdb_history",
1647 read_history (history_filename);
1651 show_prompt (struct ui_file *file, int from_tty,
1652 struct cmd_list_element *c, const char *value)
1654 fprintf_filtered (file, _("Gdb's prompt is \"%s\".\n"), value);
1658 show_async_command_editing_p (struct ui_file *file, int from_tty,
1659 struct cmd_list_element *c, const char *value)
1661 fprintf_filtered (file, _("Editing of command lines as "
1662 "they are typed is %s.\n"),
1667 show_annotation_level (struct ui_file *file, int from_tty,
1668 struct cmd_list_element *c, const char *value)
1670 fprintf_filtered (file, _("Annotation_level is %s.\n"), value);
1674 show_exec_done_display_p (struct ui_file *file, int from_tty,
1675 struct cmd_list_element *c, const char *value)
1677 fprintf_filtered (file, _("Notification of completion for "
1678 "asynchronous execution commands is %s.\n"),
1682 /* New values of the "data-directory" parameter are staged here. */
1683 static char *staged_gdb_datadir;
1685 /* "set" command for the gdb_datadir configuration variable. */
1688 set_gdb_datadir (char *args, int from_tty, struct cmd_list_element *c)
1690 set_gdb_data_directory (staged_gdb_datadir);
1691 observer_notify_gdb_datadir_changed ();
1694 /* "show" command for the gdb_datadir configuration variable. */
1697 show_gdb_datadir (struct ui_file *file, int from_tty,
1698 struct cmd_list_element *c, const char *value)
1700 fprintf_filtered (file, _("GDB's data directory is \"%s\".\n"),
1705 set_history_filename (char *args, int from_tty, struct cmd_list_element *c)
1707 /* We include the current directory so that if the user changes
1708 directories the file written will be the same as the one
1710 if (!IS_ABSOLUTE_PATH (history_filename))
1711 history_filename = reconcat (history_filename, current_directory, "/",
1712 history_filename, (char *) NULL);
1718 /* Initialize the prompt to a simple "(gdb) " prompt or to whatever
1719 the DEFAULT_PROMPT is. */
1720 set_prompt (DEFAULT_PROMPT);
1722 /* Set things up for annotation_level > 1, if the user ever decides
1724 async_annotation_suffix = "prompt";
1726 /* Set the important stuff up for command editing. */
1727 command_editing_p = 1;
1728 history_expansion_p = 0;
1729 write_history_p = 0;
1731 /* Setup important stuff for command line editing. */
1732 rl_completion_word_break_hook = gdb_completion_word_break_characters;
1733 rl_completion_entry_function = readline_line_completion_function;
1734 rl_completer_word_break_characters = default_word_break_characters ();
1735 rl_completer_quote_characters = get_gdb_completer_quote_characters ();
1736 rl_readline_name = "gdb";
1737 rl_terminal_name = getenv ("TERM");
1739 /* The name for this defun comes from Bash, where it originated.
1740 15 is Control-o, the same binding this function has in Bash. */
1741 rl_add_defun ("operate-and-get-next", gdb_rl_operate_and_get_next, 15);
1743 add_setshow_string_cmd ("prompt", class_support,
1745 _("Set gdb's prompt"),
1746 _("Show gdb's prompt"),
1749 &setlist, &showlist);
1751 add_com ("dont-repeat", class_support, dont_repeat_command, _("\
1752 Don't repeat this command.\nPrimarily \
1753 used inside of user-defined commands that should not be repeated when\n\
1756 add_setshow_boolean_cmd ("editing", class_support,
1757 &async_command_editing_p, _("\
1758 Set editing of command lines as they are typed."), _("\
1759 Show editing of command lines as they are typed."), _("\
1760 Use \"on\" to enable the editing, and \"off\" to disable it.\n\
1761 Without an argument, command line editing is enabled. To edit, use\n\
1762 EMACS-like or VI-like commands like control-P or ESC."),
1763 set_async_editing_command,
1764 show_async_command_editing_p,
1765 &setlist, &showlist);
1767 add_setshow_boolean_cmd ("save", no_class, &write_history_p, _("\
1768 Set saving of the history record on exit."), _("\
1769 Show saving of the history record on exit."), _("\
1770 Use \"on\" to enable the saving, and \"off\" to disable it.\n\
1771 Without an argument, saving is enabled."),
1773 show_write_history_p,
1774 &sethistlist, &showhistlist);
1776 add_setshow_uinteger_cmd ("size", no_class, &history_size_setshow_var, _("\
1777 Set the size of the command history,"), _("\
1778 Show the size of the command history,"), _("\
1779 ie. the number of previous commands to keep a record of.\n\
1780 If set to \"unlimited\", the number of commands kept in the history\n\
1781 list is unlimited. This defaults to the value of the environment\n\
1782 variable \"HISTSIZE\", or to 256 if this variable is not set."),
1783 set_history_size_command,
1785 &sethistlist, &showhistlist);
1787 add_setshow_filename_cmd ("filename", no_class, &history_filename, _("\
1788 Set the filename in which to record the command history"), _("\
1789 Show the filename in which to record the command history"), _("\
1790 (the list of previous commands of which a record is kept)."),
1791 set_history_filename,
1792 show_history_filename,
1793 &sethistlist, &showhistlist);
1795 add_setshow_boolean_cmd ("confirm", class_support, &confirm, _("\
1796 Set whether to confirm potentially dangerous operations."), _("\
1797 Show whether to confirm potentially dangerous operations."), NULL,
1800 &setlist, &showlist);
1802 add_setshow_zinteger_cmd ("annotate", class_obscure, &annotation_level, _("\
1803 Set annotation_level."), _("\
1804 Show annotation_level."), _("\
1805 0 == normal; 1 == fullname (for use when running under emacs)\n\
1806 2 == output annotated suitably for use by programs that control GDB."),
1808 show_annotation_level,
1809 &setlist, &showlist);
1811 add_setshow_boolean_cmd ("exec-done-display", class_support,
1812 &exec_done_display_p, _("\
1813 Set notification of completion for asynchronous execution commands."), _("\
1814 Show notification of completion for asynchronous execution commands."), _("\
1815 Use \"on\" to enable the notification, and \"off\" to disable it."),
1817 show_exec_done_display_p,
1818 &setlist, &showlist);
1820 add_setshow_filename_cmd ("data-directory", class_maintenance,
1821 &staged_gdb_datadir, _("Set GDB's data directory."),
1822 _("Show GDB's data directory."),
1824 When set, GDB uses the specified path to search for data files."),
1825 set_gdb_datadir, show_gdb_datadir,
1831 gdb_init (char *argv0)
1833 if (pre_init_ui_hook)
1834 pre_init_ui_hook ();
1836 /* Run the init function of each source file. */
1839 /* Make sure we return to the original directory upon exit, come
1840 what may, since the OS doesn't do that for us. */
1841 make_final_cleanup (do_chdir_cleanup, xstrdup (current_directory));
1844 init_cmd_lists (); /* This needs to be done first. */
1845 initialize_targets (); /* Setup target_terminal macros for utils.c. */
1846 initialize_utils (); /* Make errors and warnings possible. */
1848 /* Here is where we call all the _initialize_foo routines. */
1849 initialize_all_files ();
1851 /* This creates the current_program_space. Do this after all the
1852 _initialize_foo routines have had a chance to install their
1853 per-sspace data keys. Also do this before
1854 initialize_current_architecture is called, because it accesses
1855 exec_bfd of the current program space. */
1856 initialize_progspace ();
1857 initialize_inferiors ();
1858 initialize_current_architecture ();
1860 initialize_event_loop ();
1861 init_main (); /* But that omits this file! Do it now. */
1863 initialize_stdin_serial ();
1865 async_init_signals ();
1867 /* We need a default language for parsing expressions, so simple
1868 things like "set width 0" won't fail if no language is explicitly
1869 set in a config file or implicitly set by reading an executable
1871 set_language (language_c);
1872 expected_language = current_language; /* Don't warn about the change. */
1874 /* Allow another UI to initialize. If the UI fails to initialize,
1875 and it wants GDB to revert to the CLI, it should clear
1876 deprecated_init_ui_hook. */
1877 if (deprecated_init_ui_hook)
1878 deprecated_init_ui_hook (argv0);
1880 /* Python initialization, for example, can require various commands to be
1881 installed. For example "info pretty-printer" needs the "info"
1882 prefix to be installed. Keep things simple and just do final
1883 script initialization here. */
1884 finish_ext_lang_initialization ();