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39a1432c09
binutils-gdb/gdb/top.c
Tom Tromey 2dab0c7ba0 Remove ALL_UIS 
Continuing my goal of removing the "ALL_*" iterator macros, this
removes ALL_UIS, replacing it with an iterator adaptor.

gdb/ChangeLog
2020-05-16  Tom Tromey  <tom@tromey.com>

	* top.c (quit_force): Update.
	* infrun.c (handle_no_resumed): Update.
	* top.h (all_uis): New function.
	(ALL_UIS): Remove.
2020-05-16 09:58:46 -06:00

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/* Top level stuff for GDB, the GNU debugger.
Copyright (C) 1986-2020 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "gdbcmd.h"
#include "cli/cli-cmds.h"
#include "cli/cli-script.h"
#include "cli/cli-setshow.h"
#include "cli/cli-decode.h"
#include "symtab.h"
#include "inferior.h"
#include "infrun.h"
#include <signal.h>
#include "target.h"
#include "target-dcache.h"
#include "breakpoint.h"
#include "gdbtypes.h"
#include "expression.h"
#include "value.h"
#include "language.h"
#include "terminal.h"
#include "gdbsupport/job-control.h"
#include "annotate.h"
#include "completer.h"
#include "top.h"
#include "gdbsupport/version.h"
#include "serial.h"
#include "main.h"
#include "gdbsupport/event-loop.h"
#include "gdbthread.h"
#include "extension.h"
#include "interps.h"
#include "observable.h"
#include "maint.h"
#include "filenames.h"
#include "frame.h"
#include "gdbsupport/buffer.h"
#include "gdbsupport/gdb_select.h"
#include "gdbsupport/scope-exit.h"
#include "gdbarch.h"
#include "gdbsupport/pathstuff.h"
#include "cli/cli-style.h"
/* readline include files. */
#include "readline/readline.h"
#include "readline/history.h"
/* readline defines this. */
#undef savestring
#include <sys/types.h>
#include "event-top.h"
#include <sys/stat.h>
#include <ctype.h>
#include "ui-out.h"
#include "cli-out.h"
#include "tracepoint.h"
#include "inf-loop.h"
#if defined(TUI)
# include "tui/tui.h"
#endif
#ifndef O_NOCTTY
# define O_NOCTTY 0
#endif
extern void initialize_all_files (void);
static bool history_filename_empty (void);
#define PROMPT(X) the_prompts.prompt_stack[the_prompts.top + X].prompt
#define PREFIX(X) the_prompts.prompt_stack[the_prompts.top + X].prefix
#define SUFFIX(X) the_prompts.prompt_stack[the_prompts.top + X].suffix
/* Default command line prompt. This is overridden in some configs. */
#ifndef DEFAULT_PROMPT
#define DEFAULT_PROMPT "(gdb) "
#endif
struct ui_file **
current_ui_gdb_stdout_ptr ()
{
return &current_ui->m_gdb_stdout;
}
struct ui_file **
current_ui_gdb_stdin_ptr ()
{
return &current_ui->m_gdb_stdin;
}
struct ui_file **
current_ui_gdb_stderr_ptr ()
{
return &current_ui->m_gdb_stderr;
}
struct ui_file **
current_ui_gdb_stdlog_ptr ()
{
return &current_ui->m_gdb_stdlog;
}
struct ui_out **
current_ui_current_uiout_ptr ()
{
return &current_ui->m_current_uiout;
}
int inhibit_gdbinit = 0;
/* Flag for whether we want to confirm potentially dangerous
operations. Default is yes. */
bool confirm = true;
static void
show_confirm (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
{
fprintf_filtered (file, _("Whether to confirm potentially "
"dangerous operations is %s.\n"),
value);
}
/* Current working directory. */
char *current_directory;
/* The last command line executed on the console. Used for command
repetitions when the user enters an empty line. */
static char *saved_command_line;
/* If not NULL, the arguments that should be passed if
saved_command_line is repeated. */
static const char *repeat_arguments;
/* The previous last command line executed on the console. Used for command
repetitions when a command wants to relaunch the previously launched
command. We need this as when a command is running, saved_command_line
already contains the line of the currently executing command. */
char *previous_saved_command_line;
/* If not NULL, the arguments that should be passed if the
previous_saved_command_line is repeated. */
static const char *previous_repeat_arguments;
/* Nonzero if the current command is modified by "server ". This
affects things like recording into the command history, commands
repeating on RETURN, etc. This is so a user interface (emacs, GUI,
whatever) can issue its own commands and also send along commands
from the user, and have the user not notice that the user interface
is issuing commands too. */
bool server_command;
/* Timeout limit for response from target. */
/* The default value has been changed many times over the years. It
was originally 5 seconds. But that was thought to be a long time
to sit and wait, so it was changed to 2 seconds. That was thought
to be plenty unless the connection was going through some terminal
server or multiplexer or other form of hairy serial connection.
In mid-1996, remote_timeout was moved from remote.c to top.c and
it began being used in other remote-* targets. It appears that the
default was changed to 20 seconds at that time, perhaps because the
Renesas E7000 ICE didn't always respond in a timely manner.
But if 5 seconds is a long time to sit and wait for retransmissions,
20 seconds is far worse. This demonstrates the difficulty of using
a single variable for all protocol timeouts.
As remote.c is used much more than remote-e7000.c, it was changed
back to 2 seconds in 1999. */
int remote_timeout = 2;
/* Non-zero tells remote* modules to output debugging info. */
int remote_debug = 0;
/* Sbrk location on entry to main. Used for statistics only. */
#ifdef HAVE_USEFUL_SBRK
char *lim_at_start;
#endif
/* Hooks for alternate command interfaces. */
/* This hook is called from within gdb's many mini-event loops which
could steal control from a real user interface's event loop. It
returns non-zero if the user is requesting a detach, zero
otherwise. */
int (*deprecated_ui_loop_hook) (int);
/* Called from print_frame_info to list the line we stopped in. */
void (*deprecated_print_frame_info_listing_hook) (struct symtab * s,
int line,
int stopline,
int noerror);
/* Replaces most of query. */
int (*deprecated_query_hook) (const char *, va_list);
/* Replaces most of warning. */
void (*deprecated_warning_hook) (const char *, va_list);
/* These three functions support getting lines of text from the user.
They are used in sequence. First deprecated_readline_begin_hook is
called with a text string that might be (for example) a message for
the user to type in a sequence of commands to be executed at a
breakpoint. If this function calls back to a GUI, it might take
this opportunity to pop up a text interaction window with this
message. Next, deprecated_readline_hook is called with a prompt
that is emitted prior to collecting the user input. It can be
called multiple times. Finally, deprecated_readline_end_hook is
called to notify the GUI that we are done with the interaction
window and it can close it. */
void (*deprecated_readline_begin_hook) (const char *, ...);
char *(*deprecated_readline_hook) (const char *);
void (*deprecated_readline_end_hook) (void);
/* Called as appropriate to notify the interface that we have attached
to or detached from an already running process. */
void (*deprecated_attach_hook) (void);
void (*deprecated_detach_hook) (void);
/* Called when going to wait for the target. Usually allows the GUI
to run while waiting for target events. */
ptid_t (*deprecated_target_wait_hook) (ptid_t ptid,
struct target_waitstatus *status,
int options);
/* Used by UI as a wrapper around command execution. May do various
things like enabling/disabling buttons, etc... */
void (*deprecated_call_command_hook) (struct cmd_list_element * c,
const char *cmd, int from_tty);
/* Called when the current thread changes. Argument is thread id. */
void (*deprecated_context_hook) (int id);
/* The highest UI number ever assigned. */
static int highest_ui_num;
/* See top.h. */
ui::ui (FILE *instream_, FILE *outstream_, FILE *errstream_)
: next (nullptr),
num (++highest_ui_num),
call_readline (nullptr),
input_handler (nullptr),
command_editing (0),
interp_info (nullptr),
async (0),
secondary_prompt_depth (0),
stdin_stream (instream_),
instream (instream_),
outstream (outstream_),
errstream (errstream_),
input_fd (fileno (instream)),
input_interactive_p (ISATTY (instream)),
prompt_state (PROMPT_NEEDED),
m_gdb_stdout (new stdio_file (outstream)),
m_gdb_stdin (new stdio_file (instream)),
m_gdb_stderr (new stderr_file (errstream)),
m_gdb_stdlog (m_gdb_stderr),
m_current_uiout (nullptr)
{
buffer_init (&line_buffer);
if (ui_list == NULL)
ui_list = this;
else
{
struct ui *last;
for (last = ui_list; last->next != NULL; last = last->next)
;
last->next = this;
}
}
ui::~ui ()
{
struct ui *ui, *uiprev;
uiprev = NULL;
for (ui = ui_list; ui != NULL; uiprev = ui, ui = ui->next)
if (ui == this)
break;
gdb_assert (ui != NULL);
if (uiprev != NULL)
uiprev->next = next;
else
ui_list = next;
delete m_gdb_stdin;
delete m_gdb_stdout;
delete m_gdb_stderr;
}
/* Open file named NAME for read/write, making sure not to make it the
controlling terminal. */
static gdb_file_up
open_terminal_stream (const char *name)
{
int fd;
fd = gdb_open_cloexec (name, O_RDWR | O_NOCTTY, 0);
if (fd < 0)
perror_with_name (_("opening terminal failed"));
return gdb_file_up (fdopen (fd, "w+"));
}
/* Implementation of the "new-ui" command. */
static void
new_ui_command (const char *args, int from_tty)
{
int argc;
const char *interpreter_name;
const char *tty_name;
dont_repeat ();
gdb_argv argv (args);
argc = argv.count ();
if (argc < 2)
error (_("Usage: new-ui INTERPRETER TTY"));
interpreter_name = argv[0];
tty_name = argv[1];
{
scoped_restore save_ui = make_scoped_restore (&current_ui);
/* Open specified terminal. Note: we used to open it three times,
once for each of stdin/stdout/stderr, but that does not work
with Windows named pipes. */
gdb_file_up stream = open_terminal_stream (tty_name);
std::unique_ptr<ui> ui
(new struct ui (stream.get (), stream.get (), stream.get ()));
ui->async = 1;
current_ui = ui.get ();
set_top_level_interpreter (interpreter_name);
interp_pre_command_loop (top_level_interpreter ());
/* Make sure the file is not closed. */
stream.release ();
ui.release ();
}
printf_unfiltered ("New UI allocated\n");
}
/* Handler for SIGHUP. */
#ifdef SIGHUP
/* NOTE 1999-04-29: This function will be static again, once we modify
gdb to use the event loop as the default command loop and we merge
event-top.c into this file, top.c. */
/* static */ void
quit_cover (void)
{
/* Stop asking user for confirmation --- we're exiting. This
prevents asking the user dumb questions. */
confirm = 0;
quit_command ((char *) 0, 0);
}
#endif /* defined SIGHUP */
/* Line number we are currently in, in a file which is being sourced. */
/* NOTE 1999-04-29: This variable will be static again, once we modify
gdb to use the event loop as the default command loop and we merge
event-top.c into this file, top.c. */
/* static */ int source_line_number;
/* Name of the file we are sourcing. */
/* NOTE 1999-04-29: This variable will be static again, once we modify
gdb to use the event loop as the default command loop and we merge
event-top.c into this file, top.c. */
/* static */ std::string source_file_name;
/* Read commands from STREAM. */
void
read_command_file (FILE *stream)
{
struct ui *ui = current_ui;
scoped_restore save_instream
= make_scoped_restore (&ui->instream, stream);
/* Read commands from `instream' and execute them until end of file
or error reading instream. */
while (ui->instream != NULL && !feof (ui->instream))
{
const char *command;
/* Get a command-line. This calls the readline package. */
command = command_line_input (NULL, NULL);
if (command == NULL)
break;
command_handler (command);
}
}
void (*pre_init_ui_hook) (void);
#ifdef __MSDOS__
static void
do_chdir_cleanup (void *old_dir)
{
chdir ((const char *) old_dir);
xfree (old_dir);
}
#endif
scoped_value_mark
prepare_execute_command ()
{
/* With multiple threads running while the one we're examining is
stopped, the dcache can get stale without us being able to detect
it. For the duration of the command, though, use the dcache to
help things like backtrace. */
if (non_stop)
target_dcache_invalidate ();
return scoped_value_mark ();
}
/* Tell the user if the language has changed (except first time) after
executing a command. */
void
check_frame_language_change (void)
{
static int warned = 0;
struct frame_info *frame;
/* First make sure that a new frame has been selected, in case the
command or the hooks changed the program state. */
frame = deprecated_safe_get_selected_frame ();
if (current_language != expected_language)
{
if (language_mode == language_mode_auto && info_verbose)
{
language_info (1); /* Print what changed. */
}
warned = 0;
}
/* Warn the user if the working language does not match the language
of the current frame. Only warn the user if we are actually
running the program, i.e. there is a stack. */
/* FIXME: This should be cacheing the frame and only running when
the frame changes. */
if (has_stack_frames ())
{
enum language flang;
flang = get_frame_language (frame);
if (!warned
&& flang != language_unknown
&& flang != current_language->la_language)
{
printf_filtered ("%s\n", _(lang_frame_mismatch_warn));
warned = 1;
}
}
}
/* See top.h. */
void
wait_sync_command_done (void)
{
/* Processing events may change the current UI. */
scoped_restore save_ui = make_scoped_restore (&current_ui);
struct ui *ui = current_ui;
while (gdb_do_one_event () >= 0)
if (ui->prompt_state != PROMPT_BLOCKED)
break;
}
/* See top.h. */
void
maybe_wait_sync_command_done (int was_sync)
{
/* If the interpreter is in sync mode (we're running a user
command's list, running command hooks or similars), and we
just ran a synchronous command that started the target, wait
for that command to end. */
if (!current_ui->async
&& !was_sync
&& current_ui->prompt_state == PROMPT_BLOCKED)
wait_sync_command_done ();
}
/* See command.h. */
void
set_repeat_arguments (const char *args)
{
repeat_arguments = args;
}
/* Execute the line P as a command, in the current user context.
Pass FROM_TTY as second argument to the defining function. */
void
execute_command (const char *p, int from_tty)
{
struct cmd_list_element *c;
const char *line;
const char *cmd_start = p;
auto cleanup_if_error = make_scope_exit (bpstat_clear_actions);
scoped_value_mark cleanup = prepare_execute_command ();
/* This can happen when command_line_input hits end of file. */
if (p == NULL)
{
cleanup_if_error.release ();
return;
}
target_log_command (p);
while (*p == ' ' || *p == '\t')
p++;
if (*p)
{
const char *cmd = p;
const char *arg;
int was_sync = current_ui->prompt_state == PROMPT_BLOCKED;
line = p;
/* If trace-commands is set then this will print this command. */
print_command_trace ("%s", p);
c = lookup_cmd (&cmd, cmdlist, "", 0, 1);
p = cmd;
scoped_restore save_repeat_args
= make_scoped_restore (&repeat_arguments, nullptr);
const char *args_pointer = p;
/* Pass null arg rather than an empty one. */
arg = *p ? p : 0;
/* FIXME: cagney/2002-02-02: The c->type test is pretty dodgy
while the is_complete_command(cfunc) test is just plain
bogus. They should both be replaced by a test of the form
c->strip_trailing_white_space_p. */
/* NOTE: cagney/2002-02-02: The function.cfunc in the below
can't be replaced with func. This is because it is the
cfunc, and not the func, that has the value that the
is_complete_command hack is testing for. */
/* Clear off trailing whitespace, except for set and complete
command. */
std::string without_whitespace;
if (arg
&& c->type != set_cmd
&& !is_complete_command (c))
{
const char *old_end = arg + strlen (arg) - 1;
p = old_end;
while (p >= arg && (*p == ' ' || *p == '\t'))
p--;
if (p != old_end)
{
without_whitespace = std::string (arg, p + 1);
arg = without_whitespace.c_str ();
}
}
/* If this command has been pre-hooked, run the hook first. */
execute_cmd_pre_hook (c);
if (c->deprecated_warn_user)
deprecated_cmd_warning (line);
/* c->user_commands would be NULL in the case of a python command. */
if (c->theclass == class_user && c->user_commands)
execute_user_command (c, arg);
else if (c->theclass == class_user
&& c->prefixlist && !c->allow_unknown)
/* If this is a user defined prefix that does not allow unknown
(in other words, C is a prefix command and not a command
that can be followed by its args), report the list of
subcommands. */
{
printf_unfiltered
("\"%.*s\" must be followed by the name of a subcommand.\n",
(int) strlen (c->prefixname) - 1, c->prefixname);
help_list (*c->prefixlist, c->prefixname, all_commands, gdb_stdout);
}
else if (c->type == set_cmd)
do_set_command (arg, from_tty, c);
else if (c->type == show_cmd)
do_show_command (arg, from_tty, c);
else if (!cmd_func_p (c))
error (_("That is not a command, just a help topic."));
else if (deprecated_call_command_hook)
deprecated_call_command_hook (c, arg, from_tty);
else
cmd_func (c, arg, from_tty);
maybe_wait_sync_command_done (was_sync);
/* If this command has been post-hooked, run the hook last. */
execute_cmd_post_hook (c);
if (repeat_arguments != NULL && cmd_start == saved_command_line)
{
gdb_assert (strlen (args_pointer) >= strlen (repeat_arguments));
strcpy (saved_command_line + (args_pointer - cmd_start),
repeat_arguments);
}
}
/* Only perform the frame-language-change check if the command
we just finished executing did not resume the inferior's execution.
If it did resume the inferior, we will do that check after
the inferior stopped. */
if (has_stack_frames () && inferior_thread ()->state != THREAD_RUNNING)
check_frame_language_change ();
cleanup_if_error.release ();
}
/* Run execute_command for P and FROM_TTY. Sends its output to FILE,
do not display it to the screen. BATCH_FLAG will be
temporarily set to true. */
void
execute_command_to_ui_file (struct ui_file *file, const char *p, int from_tty)
{
/* GDB_STDOUT should be better already restored during these
restoration callbacks. */
set_batch_flag_and_restore_page_info save_page_info;
scoped_restore save_async = make_scoped_restore (&current_ui->async, 0);
{
current_uiout->redirect (file);
ui_out_redirect_pop redirect_popper (current_uiout);
scoped_restore save_stdout
= make_scoped_restore (&gdb_stdout, file);
scoped_restore save_stderr
= make_scoped_restore (&gdb_stderr, file);
scoped_restore save_stdlog
= make_scoped_restore (&gdb_stdlog, file);
scoped_restore save_stdtarg
= make_scoped_restore (&gdb_stdtarg, file);
scoped_restore save_stdtargerr
= make_scoped_restore (&gdb_stdtargerr, file);
execute_command (p, from_tty);
}
}
/* Run execute_command for P and FROM_TTY. Capture its output into the
returned string, do not display it to the screen. BATCH_FLAG will be
temporarily set to true. */
std::string
execute_command_to_string (const char *p, int from_tty,
bool term_out)
{
string_file str_file (term_out);
execute_command_to_ui_file (&str_file, p, from_tty);
return std::move (str_file.string ());
}
/* When nonzero, cause dont_repeat to do nothing. This should only be
set via prevent_dont_repeat. */
static int suppress_dont_repeat = 0;
/* See command.h */
void
dont_repeat (void)
{
struct ui *ui = current_ui;
if (suppress_dont_repeat || server_command)
return;
/* If we aren't reading from standard input, we are saving the last
thing read from stdin in line and don't want to delete it. Null
lines won't repeat here in any case. */
if (ui->instream == ui->stdin_stream)
{
*saved_command_line = 0;
repeat_arguments = NULL;
}
}
/* See command.h */
const char *
repeat_previous ()
{
/* Do not repeat this command, as this command is a repeating command. */
dont_repeat ();
/* We cannot free saved_command_line, as this line is being executed,
so swap it with previous_saved_command_line. */
std::swap (previous_saved_command_line, saved_command_line);
std::swap (previous_repeat_arguments, repeat_arguments);
const char *prev = skip_spaces (get_saved_command_line ());
if (*prev == '\0')
error (_("No previous command to relaunch"));
return prev;
}
/* See command.h. */
scoped_restore_tmpl<int>
prevent_dont_repeat (void)
{
return make_scoped_restore (&suppress_dont_repeat, 1);
}
/* See command.h. */
char *
get_saved_command_line ()
{
return saved_command_line;
}
/* See command.h. */
void
save_command_line (const char *cmd)
{
xfree (previous_saved_command_line);
previous_saved_command_line = saved_command_line;
previous_repeat_arguments = repeat_arguments;
saved_command_line = xstrdup (cmd);
repeat_arguments = NULL;
}
/* Read a line from the stream "instream" without command line editing.
It prints PROMPT once at the start.
Action is compatible with "readline", e.g. space for the result is
malloc'd and should be freed by the caller.
A NULL return means end of file. */
static char *
gdb_readline_no_editing (const char *prompt)
{
struct buffer line_buffer;
struct ui *ui = current_ui;
/* Read from stdin if we are executing a user defined command. This
is the right thing for prompt_for_continue, at least. */
FILE *stream = ui->instream != NULL ? ui->instream : stdin;
int fd = fileno (stream);
buffer_init (&line_buffer);
if (prompt != NULL)
{
/* Don't use a _filtered function here. It causes the assumed
character position to be off, since the newline we read from
the user is not accounted for. */
fputs_unfiltered (prompt, gdb_stdout);
gdb_flush (gdb_stdout);
}
while (1)
{
int c;
fd_set readfds;
QUIT;
/* Wait until at least one byte of data is available. Control-C
can interrupt interruptible_select, but not fgetc. */
FD_ZERO (&readfds);
FD_SET (fd, &readfds);
if (interruptible_select (fd + 1, &readfds, NULL, NULL, NULL) == -1)
{
if (errno == EINTR)
{
/* If this was ctrl-c, the QUIT above handles it. */
continue;
}
perror_with_name (("select"));
}
c = fgetc (stream);
if (c == EOF)
{
if (line_buffer.used_size > 0)
/* The last line does not end with a newline. Return it, and
if we are called again fgetc will still return EOF and
we'll return NULL then. */
break;
xfree (buffer_finish (&line_buffer));
return NULL;
}
if (c == '\n')
{
if (line_buffer.used_size > 0
&& line_buffer.buffer[line_buffer.used_size - 1] == '\r')
line_buffer.used_size--;
break;
}
buffer_grow_char (&line_buffer, c);
}
buffer_grow_char (&line_buffer, '\0');
return buffer_finish (&line_buffer);
}
/* Variables which control command line editing and history
substitution. These variables are given default values at the end
of this file. */
static bool command_editing_p;
/* NOTE 1999-04-29: This variable will be static again, once we modify
gdb to use the event loop as the default command loop and we merge
event-top.c into this file, top.c. */
/* static */ bool history_expansion_p;
/* Should we write out the command history on exit? In order to write out
the history both this flag must be true, and the history_filename
variable must be set to something sensible. */
static bool write_history_p;
/* Implement 'show history save'. */
static void
show_write_history_p (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
{
if (!write_history_p || !history_filename_empty ())
fprintf_filtered (file, _("Saving of the history record on exit is %s.\n"),
value);
else
fprintf_filtered (file, _("Saving of the history is disabled due to "
"the value of 'history filename'.\n"));
}
/* The variable associated with the "set/show history size"
command. The value -1 means unlimited, and -2 means undefined. */
static int history_size_setshow_var = -2;
static void
show_history_size (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
{
fprintf_filtered (file, _("The size of the command history is %s.\n"),
value);
}
/* Variable associated with the "history remove-duplicates" option.
The value -1 means unlimited. */
static int history_remove_duplicates = 0;
static void
show_history_remove_duplicates (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
{
fprintf_filtered (file,
_("The number of history entries to look back at for "
"duplicates is %s.\n"),
value);
}
/* The name of the file in which GDB history will be written. If this is
set to NULL, of the empty string then history will not be written. */
static char *history_filename;
/* Return true if the history_filename is either NULL or the empty string,
indicating that we should not try to read, nor write out the history. */
static bool
history_filename_empty (void)
{
return (history_filename == nullptr || *history_filename == '\0');
}
/* Implement 'show history filename'. */
static void
show_history_filename (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
{
if (!history_filename_empty ())
fprintf_filtered (file, _("The filename in which to record "
"the command history is \"%ps\".\n"),
styled_string (file_name_style.style (), value));
else
fprintf_filtered (file, _("There is no filename currently set for "
"recording the command history in.\n"));
}
/* This is like readline(), but it has some gdb-specific behavior.
gdb may want readline in both the synchronous and async modes during
a single gdb invocation. At the ordinary top-level prompt we might
be using the async readline. That means we can't use
rl_pre_input_hook, since it doesn't work properly in async mode.
However, for a secondary prompt (" >", such as occurs during a
`define'), gdb wants a synchronous response.
We used to call readline() directly, running it in synchronous
mode. But mixing modes this way is not supported, and as of
readline 5.x it no longer works; the arrow keys come unbound during
the synchronous call. So we make a nested call into the event
loop. That's what gdb_readline_wrapper is for. */
/* A flag set as soon as gdb_readline_wrapper_line is called; we can't
rely on gdb_readline_wrapper_result, which might still be NULL if
the user types Control-D for EOF. */
static int gdb_readline_wrapper_done;
/* The result of the current call to gdb_readline_wrapper, once a newline
is seen. */
static char *gdb_readline_wrapper_result;
/* Any intercepted hook. Operate-and-get-next sets this, expecting it
to be called after the newline is processed (which will redisplay
the prompt). But in gdb_readline_wrapper we will not get a new
prompt until the next call, or until we return to the event loop.
So we disable this hook around the newline and restore it before we
return. */
static void (*saved_after_char_processing_hook) (void);
/* See top.h. */
int
gdb_in_secondary_prompt_p (struct ui *ui)
{
return ui->secondary_prompt_depth > 0;
}
/* This function is called when readline has seen a complete line of
text. */
static void
gdb_readline_wrapper_line (gdb::unique_xmalloc_ptr<char> &&line)
{
gdb_assert (!gdb_readline_wrapper_done);
gdb_readline_wrapper_result = line.release ();
gdb_readline_wrapper_done = 1;
/* Prevent operate-and-get-next from acting too early. */
saved_after_char_processing_hook = after_char_processing_hook;
after_char_processing_hook = NULL;
/* Prevent parts of the prompt from being redisplayed if annotations
are enabled, and readline's state getting out of sync. We'll
reinstall the callback handler, which puts the terminal in raw
mode (or in readline lingo, in prepped state), when we're next
ready to process user input, either in display_gdb_prompt, or if
we're handling an asynchronous target event and running in the
background, just before returning to the event loop to process
further input (or more target events). */
if (current_ui->command_editing)
gdb_rl_callback_handler_remove ();
}
class gdb_readline_wrapper_cleanup
{
public:
gdb_readline_wrapper_cleanup ()
: m_handler_orig (current_ui->input_handler),
m_already_prompted_orig (current_ui->command_editing
? rl_already_prompted : 0),
m_target_is_async_orig (target_is_async_p ()),
m_save_ui (&current_ui)
{
current_ui->input_handler = gdb_readline_wrapper_line;
current_ui->secondary_prompt_depth++;
if (m_target_is_async_orig)
target_async (0);
}
~gdb_readline_wrapper_cleanup ()
{
struct ui *ui = current_ui;
if (ui->command_editing)
rl_already_prompted = m_already_prompted_orig;
gdb_assert (ui->input_handler == gdb_readline_wrapper_line);
ui->input_handler = m_handler_orig;
/* Don't restore our input handler in readline yet. That would make
readline prep the terminal (putting it in raw mode), while the
line we just read may trigger execution of a command that expects
the terminal in the default cooked/canonical mode, such as e.g.,
running Python's interactive online help utility. See
gdb_readline_wrapper_line for when we'll reinstall it. */
gdb_readline_wrapper_result = NULL;
gdb_readline_wrapper_done = 0;
ui->secondary_prompt_depth--;
gdb_assert (ui->secondary_prompt_depth >= 0);
after_char_processing_hook = saved_after_char_processing_hook;
saved_after_char_processing_hook = NULL;
if (m_target_is_async_orig)
target_async (1);
}
DISABLE_COPY_AND_ASSIGN (gdb_readline_wrapper_cleanup);
private:
void (*m_handler_orig) (gdb::unique_xmalloc_ptr<char> &&);
int m_already_prompted_orig;
/* Whether the target was async. */
int m_target_is_async_orig;
/* Processing events may change the current UI. */
scoped_restore_tmpl<struct ui *> m_save_ui;
};
char *
gdb_readline_wrapper (const char *prompt)
{
struct ui *ui = current_ui;
gdb_readline_wrapper_cleanup cleanup;
/* Display our prompt and prevent double prompt display. Don't pass
down a NULL prompt, since that has special meaning for
display_gdb_prompt -- it indicates a request to print the primary
prompt, while we want a secondary prompt here. */
display_gdb_prompt (prompt != NULL ? prompt : "");
if (ui->command_editing)
rl_already_prompted = 1;
if (after_char_processing_hook)
(*after_char_processing_hook) ();
gdb_assert (after_char_processing_hook == NULL);
while (gdb_do_one_event () >= 0)
if (gdb_readline_wrapper_done)
break;
return gdb_readline_wrapper_result;
}
/* The current saved history number from operate-and-get-next.
This is -1 if not valid. */
static int operate_saved_history = -1;
/* This is put on the appropriate hook and helps operate-and-get-next
do its work. */
static void
gdb_rl_operate_and_get_next_completion (void)
{
int delta = where_history () - operate_saved_history;
/* The `key' argument to rl_get_previous_history is ignored. */
rl_get_previous_history (delta, 0);
operate_saved_history = -1;
/* readline doesn't automatically update the display for us. */
rl_redisplay ();
after_char_processing_hook = NULL;
rl_pre_input_hook = NULL;
}
/* This is a gdb-local readline command handler. It accepts the
current command line (like RET does) and, if this command was taken
from the history, arranges for the next command in the history to
appear on the command line when the prompt returns.
We ignore the arguments. */
static int
gdb_rl_operate_and_get_next (int count, int key)
{
int where;
/* Use the async hook. */
after_char_processing_hook = gdb_rl_operate_and_get_next_completion;
/* Find the current line, and find the next line to use. */
where = where_history();
if ((history_is_stifled () && (history_length >= history_max_entries))
|| (where >= history_length - 1))
operate_saved_history = where;
else
operate_saved_history = where + 1;
return rl_newline (1, key);
}
/* Number of user commands executed during this session. */
static int command_count = 0;
/* Add the user command COMMAND to the input history list. */
void
gdb_add_history (const char *command)
{
command_count++;
if (history_remove_duplicates != 0)
{
int lookbehind;
int lookbehind_threshold;
/* The lookbehind threshold for finding a duplicate history entry is
bounded by command_count because we can't meaningfully delete
history entries that are already stored in the history file since
the history file is appended to. */
if (history_remove_duplicates == -1
|| history_remove_duplicates > command_count)
lookbehind_threshold = command_count;
else
lookbehind_threshold = history_remove_duplicates;
using_history ();
for (lookbehind = 0; lookbehind < lookbehind_threshold; lookbehind++)
{
HIST_ENTRY *temp = previous_history ();
if (temp == NULL)
break;
if (strcmp (temp->line, command) == 0)
{
HIST_ENTRY *prev = remove_history (where_history ());
command_count--;
free_history_entry (prev);
break;
}
}
using_history ();
}
add_history (command);
}
/* Safely append new history entries to the history file in a corruption-free
way using an intermediate local history file. */
static void
gdb_safe_append_history (void)
{
int ret, saved_errno;
std::string local_history_filename
= string_printf ("%s-gdb%ld~", history_filename, (long) getpid ());
ret = rename (history_filename, local_history_filename.c_str ());
saved_errno = errno;
if (ret < 0 && saved_errno != ENOENT)
{
warning (_("Could not rename %ps to %ps: %s"),
styled_string (file_name_style.style (), history_filename),
styled_string (file_name_style.style (),
local_history_filename.c_str ()),
safe_strerror (saved_errno));
}
else
{
if (ret < 0)
{
/* If the rename failed with ENOENT then either the global history
file never existed in the first place or another GDB process is
currently appending to it (and has thus temporarily renamed it).
Since we can't distinguish between these two cases, we have to
conservatively assume the first case and therefore must write out
(not append) our known history to our local history file and try
to move it back anyway. Otherwise a global history file would
never get created! */
gdb_assert (saved_errno == ENOENT);
write_history (local_history_filename.c_str ());
}
else
{
append_history (command_count, local_history_filename.c_str ());
if (history_is_stifled ())
history_truncate_file (local_history_filename.c_str (),
history_max_entries);
}
ret = rename (local_history_filename.c_str (), history_filename);
saved_errno = errno;
if (ret < 0 && saved_errno != EEXIST)
warning (_("Could not rename %s to %s: %s"),
local_history_filename.c_str (), history_filename,
safe_strerror (saved_errno));
}
}
/* Read one line from the command input stream `instream' into a local
static buffer. The buffer is made bigger as necessary. Returns
the address of the start of the line.
NULL is returned for end of file.
This routine either uses fancy command line editing or simple input
as the user has requested. */
const char *
command_line_input (const char *prompt_arg, const char *annotation_suffix)
{
static struct buffer cmd_line_buffer;
static int cmd_line_buffer_initialized;
struct ui *ui = current_ui;
const char *prompt = prompt_arg;
char *cmd;
int from_tty = ui->instream == ui->stdin_stream;
/* The annotation suffix must be non-NULL. */
if (annotation_suffix == NULL)
annotation_suffix = "";
if (from_tty && annotation_level > 1)
{
char *local_prompt;
local_prompt
= (char *) alloca ((prompt == NULL ? 0 : strlen (prompt))
+ strlen (annotation_suffix) + 40);
if (prompt == NULL)
local_prompt[0] = '\0';
else
strcpy (local_prompt, prompt);
strcat (local_prompt, "\n\032\032");
strcat (local_prompt, annotation_suffix);
strcat (local_prompt, "\n");
prompt = local_prompt;
}
if (!cmd_line_buffer_initialized)
{
buffer_init (&cmd_line_buffer);
cmd_line_buffer_initialized = 1;
}
/* Starting a new command line. */
cmd_line_buffer.used_size = 0;
#ifdef SIGTSTP
if (job_control)
signal (SIGTSTP, handle_sigtstp);
#endif
while (1)
{
gdb::unique_xmalloc_ptr<char> rl;
/* Make sure that all output has been output. Some machines may
let you get away with leaving out some of the gdb_flush, but
not all. */
wrap_here ("");
gdb_flush (gdb_stdout);
gdb_flush (gdb_stderr);
if (!source_file_name.empty ())
++source_line_number;
if (from_tty && annotation_level > 1)
{
puts_unfiltered ("\n\032\032pre-");
puts_unfiltered (annotation_suffix);
puts_unfiltered ("\n");
}
/* Don't use fancy stuff if not talking to stdin. */
if (deprecated_readline_hook
&& from_tty
&& input_interactive_p (current_ui))
{
rl.reset ((*deprecated_readline_hook) (prompt));
}
else if (command_editing_p
&& from_tty
&& input_interactive_p (current_ui))
{
rl.reset (gdb_readline_wrapper (prompt));
}
else
{
rl.reset (gdb_readline_no_editing (prompt));
}
cmd = handle_line_of_input (&cmd_line_buffer, rl.get (),
0, annotation_suffix);
if (cmd == (char *) EOF)
{
cmd = NULL;
break;
}
if (cmd != NULL)
break;
/* Got partial input. I.e., got a line that ends with a
continuation character (backslash). Suppress printing the
prompt again. */
prompt = NULL;
}
#ifdef SIGTSTP
if (job_control)
signal (SIGTSTP, SIG_DFL);
#endif
return cmd;
}
/* See top.h. */
void
print_gdb_version (struct ui_file *stream, bool interactive)
{
/* From GNU coding standards, first line is meant to be easy for a
program to parse, and is just canonical program name and version
number, which starts after last space. */
ui_file_style style;
if (interactive)
{
ui_file_style nstyle = { ui_file_style::MAGENTA, ui_file_style::NONE,
ui_file_style::BOLD };
style = nstyle;
}
fprintf_styled (stream, style, "GNU gdb %s%s\n", PKGVERSION, version);
/* Second line is a copyright notice. */
fprintf_filtered (stream,
"Copyright (C) 2020 Free Software Foundation, Inc.\n");
/* Following the copyright is a brief statement that the program is
free software, that users are free to copy and change it on
certain conditions, that it is covered by the GNU GPL, and that
there is no warranty. */
fprintf_filtered (stream, "\
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>\
\nThis is free software: you are free to change and redistribute it.\n\
There is NO WARRANTY, to the extent permitted by law.");
if (!interactive)
return;
fprintf_filtered (stream, ("\nType \"show copying\" and "
"\"show warranty\" for details.\n"));
/* After the required info we print the configuration information. */
fprintf_filtered (stream, "This GDB was configured as \"");
if (strcmp (host_name, target_name) != 0)
{
fprintf_filtered (stream, "--host=%s --target=%s",
host_name, target_name);
}
else
{
fprintf_filtered (stream, "%s", host_name);
}
fprintf_filtered (stream, "\".\n");
fprintf_filtered (stream, _("Type \"show configuration\" "
"for configuration details.\n"));
if (REPORT_BUGS_TO[0])
{
fprintf_filtered (stream,
_("For bug reporting instructions, please see:\n"));
fprintf_filtered (stream, "%s.\n", REPORT_BUGS_TO);
}
fprintf_filtered (stream,
_("Find the GDB manual and other documentation \
resources online at:\n <http://www.gnu.org/software/gdb/documentation/>."));
fprintf_filtered (stream, "\n\n");
fprintf_filtered (stream, _("For help, type \"help\".\n"));
fprintf_filtered (stream,
_("Type \"apropos word\" to search for commands \
related to \"word\"."));
}
/* Print the details of GDB build-time configuration. */
void
print_gdb_configuration (struct ui_file *stream)
{
fprintf_filtered (stream, _("\
This GDB was configured as follows:\n\
configure --host=%s --target=%s\n\
"), host_name, target_name);
fprintf_filtered (stream, _("\
--with-auto-load-dir=%s\n\
--with-auto-load-safe-path=%s\n\
"), AUTO_LOAD_DIR, AUTO_LOAD_SAFE_PATH);
#if HAVE_LIBEXPAT
fprintf_filtered (stream, _("\
--with-expat\n\
"));
#else
fprintf_filtered (stream, _("\
--without-expat\n\
"));
#endif
if (GDB_DATADIR[0])
fprintf_filtered (stream, _("\
--with-gdb-datadir=%s%s\n\
"), GDB_DATADIR, GDB_DATADIR_RELOCATABLE ? " (relocatable)" : "");
#ifdef ICONV_BIN
fprintf_filtered (stream, _("\
--with-iconv-bin=%s%s\n\
"), ICONV_BIN, ICONV_BIN_RELOCATABLE ? " (relocatable)" : "");
#endif
if (JIT_READER_DIR[0])
fprintf_filtered (stream, _("\
--with-jit-reader-dir=%s%s\n\
"), JIT_READER_DIR, JIT_READER_DIR_RELOCATABLE ? " (relocatable)" : "");
#if HAVE_LIBUNWIND_IA64_H
fprintf_filtered (stream, _("\
--with-libunwind-ia64\n\
"));
#else
fprintf_filtered (stream, _("\
--without-libunwind-ia64\n\
"));
#endif
#if HAVE_LIBLZMA
fprintf_filtered (stream, _("\
--with-lzma\n\
"));
#else
fprintf_filtered (stream, _("\
--without-lzma\n\
"));
#endif
#if HAVE_LIBBABELTRACE
fprintf_filtered (stream, _("\
--with-babeltrace\n\
"));
#else
fprintf_filtered (stream, _("\
--without-babeltrace\n\
"));
#endif
#if HAVE_LIBIPT
fprintf_filtered (stream, _("\
--with-intel-pt\n\
"));
#else
fprintf_filtered (stream, _("\
--without-intel-pt\n\
"));
#endif
#if HAVE_LIBMPFR
fprintf_filtered (stream, _("\
--with-mpfr\n\
"));
#else
fprintf_filtered (stream, _("\
--without-mpfr\n\
"));
#endif
#if HAVE_LIBXXHASH
fprintf_filtered (stream, _("\
--with-xxhash\n\
"));
#else
fprintf_filtered (stream, _("\
--without-xxhash\n\
"));
#endif
#ifdef WITH_PYTHON_PATH
fprintf_filtered (stream, _("\
--with-python=%s%s\n\
"), WITH_PYTHON_PATH, PYTHON_PATH_RELOCATABLE ? " (relocatable)" : "");
#else
fprintf_filtered (stream, _("\
--without-python\n\
"));
#endif
#if HAVE_LIBDEBUGINFOD
fprintf_filtered (stream, _("\
--with-debuginfod\n\
"));
#else
fprintf_filtered (stream, _("\
--without-debuginfod\n\
"));
#endif
#if HAVE_GUILE
fprintf_filtered (stream, _("\
--with-guile\n\
"));
#else
fprintf_filtered (stream, _("\
--without-guile\n\
"));
#endif
#if HAVE_SOURCE_HIGHLIGHT
fprintf_filtered (stream, _("\
--enable-source-highlight\n\
"));
#else
fprintf_filtered (stream, _("\
--disable-source-highlight\n\
"));
#endif
#ifdef RELOC_SRCDIR
fprintf_filtered (stream, _("\
--with-relocated-sources=%s\n\
"), RELOC_SRCDIR);
#endif
if (DEBUGDIR[0])
fprintf_filtered (stream, _("\
--with-separate-debug-dir=%s%s\n\
"), DEBUGDIR, DEBUGDIR_RELOCATABLE ? " (relocatable)" : "");
if (TARGET_SYSTEM_ROOT[0])
fprintf_filtered (stream, _("\
--with-sysroot=%s%s\n\
"), TARGET_SYSTEM_ROOT, TARGET_SYSTEM_ROOT_RELOCATABLE ? " (relocatable)" : "");
if (SYSTEM_GDBINIT[0])
fprintf_filtered (stream, _("\
--with-system-gdbinit=%s%s\n\
"), SYSTEM_GDBINIT, SYSTEM_GDBINIT_RELOCATABLE ? " (relocatable)" : "");
if (SYSTEM_GDBINIT_DIR[0])
fprintf_filtered (stream, _("\
--with-system-gdbinit-dir=%s%s\n\
"), SYSTEM_GDBINIT_DIR, SYSTEM_GDBINIT_DIR_RELOCATABLE ? " (relocatable)" : "");
/* We assume "relocatable" will be printed at least once, thus we always
print this text. It's a reasonably safe assumption for now. */
fprintf_filtered (stream, _("\n\
(\"Relocatable\" means the directory can be moved with the GDB installation\n\
tree, and GDB will still find it.)\n\
"));
}
/* The current top level prompt, settable with "set prompt", and/or
with the python `gdb.prompt_hook' hook. */
static char *top_prompt;
/* Access method for the GDB prompt string. */
char *
get_prompt (void)
{
return top_prompt;
}
/* Set method for the GDB prompt string. */
void
set_prompt (const char *s)
{
char *p = xstrdup (s);
xfree (top_prompt);
top_prompt = p;
}
/* Kills or detaches the given inferior, depending on how we originally
gained control of it. */
static void
kill_or_detach (inferior *inf, int from_tty)
{
if (inf->pid == 0)
return;
thread_info *thread = any_thread_of_inferior (inf);
if (thread != NULL)
{
switch_to_thread (thread);
/* Leave core files alone. */
if (target_has_execution)
{
if (inf->attach_flag)
target_detach (inf, from_tty);
else
target_kill ();
}
}
}
/* Prints info about what GDB will do to inferior INF on a "quit". OUT is
where to collect the output. */
static void
print_inferior_quit_action (inferior *inf, ui_file *out)
{
if (inf->pid == 0)
return;
if (inf->attach_flag)
fprintf_filtered (out,
_("\tInferior %d [%s] will be detached.\n"), inf->num,
target_pid_to_str (ptid_t (inf->pid)).c_str ());
else
fprintf_filtered (out,
_("\tInferior %d [%s] will be killed.\n"), inf->num,
target_pid_to_str (ptid_t (inf->pid)).c_str ());
}
/* If necessary, make the user confirm that we should quit. Return
non-zero if we should quit, zero if we shouldn't. */
int
quit_confirm (void)
{
/* Don't even ask if we're only debugging a core file inferior. */
if (!have_live_inferiors ())
return 1;
/* Build the query string as a single string. */
string_file stb;
stb.puts (_("A debugging session is active.\n\n"));
for (inferior *inf : all_inferiors ())
print_inferior_quit_action (inf, &stb);
stb.puts (_("\nQuit anyway? "));
return query ("%s", stb.c_str ());
}
/* Prepare to exit GDB cleanly by undoing any changes made to the
terminal so that we leave the terminal in the state we acquired it. */
static void
undo_terminal_modifications_before_exit (void)
{
struct ui *saved_top_level = current_ui;
target_terminal::ours ();
current_ui = main_ui;
#if defined(TUI)
tui_disable ();
#endif
gdb_disable_readline ();
current_ui = saved_top_level;
}
/* Quit without asking for confirmation. */
void
quit_force (int *exit_arg, int from_tty)
{
int exit_code = 0;
undo_terminal_modifications_before_exit ();
/* An optional expression may be used to cause gdb to terminate with the
value of that expression. */
if (exit_arg)
exit_code = *exit_arg;
else if (return_child_result)
exit_code = return_child_result_value;
/* We want to handle any quit errors and exit regardless. */
/* Get out of tfind mode, and kill or detach all inferiors. */
try
{
disconnect_tracing ();
for (inferior *inf : all_inferiors ())
kill_or_detach (inf, from_tty);
}
catch (const gdb_exception &ex)
{
exception_print (gdb_stderr, ex);
}
/* Give all pushed targets a chance to do minimal cleanup, and pop
them all out. */
for (inferior *inf : all_inferiors ())
{
switch_to_inferior_no_thread (inf);
try
{
pop_all_targets ();
}
catch (const gdb_exception &ex)
{
exception_print (gdb_stderr, ex);
}
}
/* Save the history information if it is appropriate to do so. */
try
{
if (write_history_p && history_filename)
{
int save = 0;
/* History is currently shared between all UIs. If there's
any UI with a terminal, save history. */
for (ui *ui : all_uis ())
{
if (input_interactive_p (ui))
{
save = 1;
break;
}
}
if (save)
gdb_safe_append_history ();
}
}
catch (const gdb_exception &ex)
{
exception_print (gdb_stderr, ex);
}
/* Destroy any values currently allocated now instead of leaving it
to global destructors, because that may be too late. For
example, the destructors of xmethod values call into the Python
runtime, which is finalized via a final cleanup. */
finalize_values ();
/* Do any final cleanups before exiting. */
try
{
do_final_cleanups ();
}
catch (const gdb_exception &ex)
{
exception_print (gdb_stderr, ex);
}
exit (exit_code);
}
/* The value of the "interactive-mode" setting. */
static enum auto_boolean interactive_mode = AUTO_BOOLEAN_AUTO;
/* Implement the "show interactive-mode" option. */
static void
show_interactive_mode (struct ui_file *file, int from_tty,
struct cmd_list_element *c,
const char *value)
{
if (interactive_mode == AUTO_BOOLEAN_AUTO)
fprintf_filtered (file, "Debugger's interactive mode "
"is %s (currently %s).\n",
value, input_interactive_p (current_ui) ? "on" : "off");
else
fprintf_filtered (file, "Debugger's interactive mode is %s.\n", value);
}
/* Returns whether GDB is running on an interactive terminal. */
int
input_interactive_p (struct ui *ui)
{
if (batch_flag)
return 0;
if (interactive_mode != AUTO_BOOLEAN_AUTO)
return interactive_mode == AUTO_BOOLEAN_TRUE;
return ui->input_interactive_p;
}
static void
dont_repeat_command (const char *ignored, int from_tty)
{
/* Can't call dont_repeat here because we're not necessarily reading
from stdin. */
*saved_command_line = 0;
}
/* Functions to manipulate command line editing control variables. */
/* Number of commands to print in each call to show_commands. */
#define Hist_print 10
void
show_commands (const char *args, int from_tty)
{
/* Index for history commands. Relative to history_base. */
int offset;
/* Number of the history entry which we are planning to display next.
Relative to history_base. */
static int num = 0;
/* Print out some of the commands from the command history. */
if (args)
{
if (args[0] == '+' && args[1] == '\0')
/* "info editing +" should print from the stored position. */
;
else
/* "info editing <exp>" should print around command number <exp>. */
num = (parse_and_eval_long (args) - history_base) - Hist_print / 2;
}
/* "show commands" means print the last Hist_print commands. */
else
{
num = history_length - Hist_print;
}
if (num < 0)
num = 0;
/* If there are at least Hist_print commands, we want to display the last
Hist_print rather than, say, the last 6. */
if (history_length - num < Hist_print)
{
num = history_length - Hist_print;
if (num < 0)
num = 0;
}
for (offset = num;
offset < num + Hist_print && offset < history_length;
offset++)
{
printf_filtered ("%5d %s\n", history_base + offset,
(history_get (history_base + offset))->line);
}
/* The next command we want to display is the next one that we haven't
displayed yet. */
num += Hist_print;
/* If the user repeats this command with return, it should do what
"show commands +" does. This is unnecessary if arg is null,
because "show commands +" is not useful after "show commands". */
if (from_tty && args)
set_repeat_arguments ("+");
}
/* Update the size of our command history file to HISTORY_SIZE.
A HISTORY_SIZE of -1 stands for unlimited. */
static void
set_readline_history_size (int history_size)
{
gdb_assert (history_size >= -1);
if (history_size == -1)
unstifle_history ();
else
stifle_history (history_size);
}
/* Called by do_setshow_command. */
static void
set_history_size_command (const char *args,
int from_tty, struct cmd_list_element *c)
{
set_readline_history_size (history_size_setshow_var);
}
bool info_verbose = false; /* Default verbose msgs off. */
/* Called by do_set_command. An elaborate joke. */
void
set_verbose (const char *args, int from_tty, struct cmd_list_element *c)
{
const char *cmdname = "verbose";
struct cmd_list_element *showcmd;
showcmd = lookup_cmd_1 (&cmdname, showlist, NULL, 1);
gdb_assert (showcmd != NULL && showcmd != CMD_LIST_AMBIGUOUS);
if (c->doc && c->doc_allocated)
xfree ((char *) c->doc);
if (showcmd->doc && showcmd->doc_allocated)
xfree ((char *) showcmd->doc);
if (info_verbose)
{
c->doc = _("Set verbose printing of informational messages.");
showcmd->doc = _("Show verbose printing of informational messages.");
}
else
{
c->doc = _("Set verbosity.");
showcmd->doc = _("Show verbosity.");
}
c->doc_allocated = 0;
showcmd->doc_allocated = 0;
}
/* Init the history buffer. Note that we are called after the init file(s)
have been read so that the user can change the history file via his
.gdbinit file (for instance). The GDBHISTFILE environment variable
overrides all of this. */
void
init_history (void)
{
const char *tmpenv;
tmpenv = getenv ("GDBHISTSIZE");
if (tmpenv)
{
long var;
int saved_errno;
char *endptr;
tmpenv = skip_spaces (tmpenv);
errno = 0;
var = strtol (tmpenv, &endptr, 10);
saved_errno = errno;
endptr = skip_spaces (endptr);
/* If GDBHISTSIZE is non-numeric then ignore it. If GDBHISTSIZE is the
empty string, a negative number or a huge positive number (larger than
INT_MAX) then set the history size to unlimited. Otherwise set our
history size to the number we have read. This behavior is consistent
with how bash handles HISTSIZE. */
if (*endptr != '\0')
;
else if (*tmpenv == '\0'
|| var < 0
|| var > INT_MAX
/* On targets where INT_MAX == LONG_MAX, we have to look at
errno after calling strtol to distinguish between a value that
is exactly INT_MAX and an overflowing value that was clamped
to INT_MAX. */
|| (var == INT_MAX && saved_errno == ERANGE))
history_size_setshow_var = -1;
else
history_size_setshow_var = var;
}
/* If neither the init file nor GDBHISTSIZE has set a size yet, pick the
default. */
if (history_size_setshow_var == -2)
history_size_setshow_var = 256;
set_readline_history_size (history_size_setshow_var);
tmpenv = getenv ("GDBHISTFILE");
if (tmpenv != nullptr)
history_filename = xstrdup (tmpenv);
else if (history_filename == nullptr)
{
/* We include the current directory so that if the user changes
directories the file written will be the same as the one
that was read. */
#ifdef __MSDOS__
/* No leading dots in file names are allowed on MSDOS. */
const char *fname = "_gdb_history";
#else
const char *fname = ".gdb_history";
#endif
gdb::unique_xmalloc_ptr<char> temp (gdb_abspath (fname));
history_filename = temp.release ();
}
if (!history_filename_empty ())
read_history (history_filename);
}
static void
show_prompt (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
{
fprintf_filtered (file, _("Gdb's prompt is \"%s\".\n"), value);
}
/* "set editing" command. */
static void
set_editing (const char *args, int from_tty, struct cmd_list_element *c)
{
change_line_handler (set_editing_cmd_var);
/* Update the control variable so that MI's =cmd-param-changed event
shows the correct value. */
set_editing_cmd_var = current_ui->command_editing;
}
static void
show_editing (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
{
fprintf_filtered (file, _("Editing of command lines as "
"they are typed is %s.\n"),
current_ui->command_editing ? _("on") : _("off"));
}
static void
show_annotation_level (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
{
fprintf_filtered (file, _("Annotation_level is %s.\n"), value);
}
static void
show_exec_done_display_p (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
{
fprintf_filtered (file, _("Notification of completion for "
"asynchronous execution commands is %s.\n"),
value);
}
/* New values of the "data-directory" parameter are staged here. */
static char *staged_gdb_datadir;
/* "set" command for the gdb_datadir configuration variable. */
static void
set_gdb_datadir (const char *args, int from_tty, struct cmd_list_element *c)
{
set_gdb_data_directory (staged_gdb_datadir);
gdb::observers::gdb_datadir_changed.notify ();
}
/* "show" command for the gdb_datadir configuration variable. */
static void
show_gdb_datadir (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
{
fprintf_filtered (file, _("GDB's data directory is \"%ps\".\n"),
styled_string (file_name_style.style (),
gdb_datadir.c_str ()));
}
/* Implement 'set history filename'. */
static void
set_history_filename (const char *args,
int from_tty, struct cmd_list_element *c)
{
/* We include the current directory so that if the user changes
directories the file written will be the same as the one
that was read. */
if (!history_filename_empty () && !IS_ABSOLUTE_PATH (history_filename))
{
gdb::unique_xmalloc_ptr<char> temp (gdb_abspath (history_filename));
xfree (history_filename);
history_filename = temp.release ();
}
}
static void
init_gdb_version_vars (void)
{
struct internalvar *major_version_var = create_internalvar ("_gdb_major");
struct internalvar *minor_version_var = create_internalvar ("_gdb_minor");
int vmajor = 0, vminor = 0, vrevision = 0;
sscanf (version, "%d.%d.%d", &vmajor, &vminor, &vrevision);
set_internalvar_integer (major_version_var, vmajor);
set_internalvar_integer (minor_version_var, vminor + (vrevision > 0));
}
static void
init_main (void)
{
struct cmd_list_element *c;
/* Initialize the prompt to a simple "(gdb) " prompt or to whatever
the DEFAULT_PROMPT is. */
set_prompt (DEFAULT_PROMPT);
/* Set the important stuff up for command editing. */
command_editing_p = 1;
history_expansion_p = 0;
write_history_p = 0;
/* Setup important stuff for command line editing. */
rl_completion_word_break_hook = gdb_completion_word_break_characters;
rl_attempted_completion_function = gdb_rl_attempted_completion_function;
set_rl_completer_word_break_characters (default_word_break_characters ());
rl_completer_quote_characters = get_gdb_completer_quote_characters ();
rl_completion_display_matches_hook = cli_display_match_list;
rl_readline_name = "gdb";
rl_terminal_name = getenv ("TERM");
/* The name for this defun comes from Bash, where it originated.
15 is Control-o, the same binding this function has in Bash. */
rl_add_defun ("operate-and-get-next", gdb_rl_operate_and_get_next, 15);
add_setshow_string_cmd ("prompt", class_support,
&top_prompt,
_("Set gdb's prompt."),
_("Show gdb's prompt."),
NULL, NULL,
show_prompt,
&setlist, &showlist);
add_com ("dont-repeat", class_support, dont_repeat_command, _("\
Don't repeat this command.\nPrimarily \
used inside of user-defined commands that should not be repeated when\n\
hitting return."));
add_setshow_boolean_cmd ("editing", class_support,
&set_editing_cmd_var, _("\
Set editing of command lines as they are typed."), _("\
Show editing of command lines as they are typed."), _("\
Use \"on\" to enable the editing, and \"off\" to disable it.\n\
Without an argument, command line editing is enabled. To edit, use\n\
EMACS-like or VI-like commands like control-P or ESC."),
set_editing,
show_editing,
&setlist, &showlist);
add_setshow_boolean_cmd ("save", no_class, &write_history_p, _("\
Set saving of the history record on exit."), _("\
Show saving of the history record on exit."), _("\
Use \"on\" to enable the saving, and \"off\" to disable it.\n\
Without an argument, saving is enabled."),
NULL,
show_write_history_p,
&sethistlist, &showhistlist);
add_setshow_zuinteger_unlimited_cmd ("size", no_class,
&history_size_setshow_var, _("\
Set the size of the command history."), _("\
Show the size of the command history."), _("\
This is the number of previous commands to keep a record of.\n\
If set to \"unlimited\", the number of commands kept in the history\n\
list is unlimited. This defaults to the value of the environment\n\
variable \"GDBHISTSIZE\", or to 256 if this variable is not set."),
set_history_size_command,
show_history_size,
&sethistlist, &showhistlist);
add_setshow_zuinteger_unlimited_cmd ("remove-duplicates", no_class,
&history_remove_duplicates, _("\
Set how far back in history to look for and remove duplicate entries."), _("\
Show how far back in history to look for and remove duplicate entries."), _("\
If set to a nonzero value N, GDB will look back at the last N history entries\n\
and remove the first history entry that is a duplicate of the most recent\n\
entry, each time a new history entry is added.\n\
If set to \"unlimited\", this lookbehind is unbounded.\n\
Only history entries added during this session are considered for removal.\n\
If set to 0, removal of duplicate history entries is disabled.\n\
By default this option is set to 0."),
NULL,
show_history_remove_duplicates,
&sethistlist, &showhistlist);
add_setshow_optional_filename_cmd ("filename", no_class, &history_filename, _("\
Set the filename in which to record the command history."), _("\
Show the filename in which to record the command history."), _("\
(the list of previous commands of which a record is kept)."),
set_history_filename,
show_history_filename,
&sethistlist, &showhistlist);
add_setshow_boolean_cmd ("confirm", class_support, &confirm, _("\
Set whether to confirm potentially dangerous operations."), _("\
Show whether to confirm potentially dangerous operations."), NULL,
NULL,
show_confirm,
&setlist, &showlist);
add_setshow_zinteger_cmd ("annotate", class_obscure, &annotation_level, _("\
Set annotation_level."), _("\
Show annotation_level."), _("\
0 == normal; 1 == fullname (for use when running under emacs)\n\
2 == output annotated suitably for use by programs that control GDB."),
NULL,
show_annotation_level,
&setlist, &showlist);
add_setshow_boolean_cmd ("exec-done-display", class_support,
&exec_done_display_p, _("\
Set notification of completion for asynchronous execution commands."), _("\
Show notification of completion for asynchronous execution commands."), _("\
Use \"on\" to enable the notification, and \"off\" to disable it."),
NULL,
show_exec_done_display_p,
&setlist, &showlist);
add_setshow_filename_cmd ("data-directory", class_maintenance,
&staged_gdb_datadir, _("Set GDB's data directory."),
_("Show GDB's data directory."),
_("\
When set, GDB uses the specified path to search for data files."),
set_gdb_datadir, show_gdb_datadir,
&setlist,
&showlist);
add_setshow_auto_boolean_cmd ("interactive-mode", class_support,
&interactive_mode, _("\
Set whether GDB's standard input is a terminal."), _("\
Show whether GDB's standard input is a terminal."), _("\
If on, GDB assumes that standard input is a terminal. In practice, it\n\
means that GDB should wait for the user to answer queries associated to\n\
commands entered at the command prompt. If off, GDB assumes that standard\n\
input is not a terminal, and uses the default answer to all queries.\n\
If auto (the default), determine which mode to use based on the standard\n\
input settings."),
NULL,
show_interactive_mode,
&setlist, &showlist);
c = add_cmd ("new-ui", class_support, new_ui_command, _("\
Create a new UI.\n\
Usage: new-ui INTERPRETER TTY\n\
The first argument is the name of the interpreter to run.\n\
The second argument is the terminal the UI runs on."), &cmdlist);
set_cmd_completer (c, interpreter_completer);
}
void
gdb_init (char *argv0)
{
saved_command_line = xstrdup ("");
previous_saved_command_line = xstrdup ("");
if (pre_init_ui_hook)
pre_init_ui_hook ();
/* Run the init function of each source file. */
#ifdef __MSDOS__
/* Make sure we return to the original directory upon exit, come
what may, since the OS doesn't do that for us. */
make_final_cleanup (do_chdir_cleanup, xstrdup (current_directory));
#endif
init_cmd_lists (); /* This needs to be done first. */
init_page_info ();
/* Here is where we call all the _initialize_foo routines. */
initialize_all_files ();
/* This creates the current_program_space. Do this after all the
_initialize_foo routines have had a chance to install their
per-sspace data keys. Also do this before
initialize_current_architecture is called, because it accesses
exec_bfd of the current program space. */
initialize_progspace ();
initialize_inferiors ();
initialize_current_architecture ();
init_main (); /* But that omits this file! Do it now. */
initialize_stdin_serial ();
/* Take a snapshot of our tty state before readline/ncurses have had a chance
to alter it. */
set_initial_gdb_ttystate ();
async_init_signals ();
/* We need a default language for parsing expressions, so simple
things like "set width 0" won't fail if no language is explicitly
set in a config file or implicitly set by reading an executable
during startup. */
set_language (language_c);
expected_language = current_language; /* Don't warn about the change. */
/* Python initialization, for example, can require various commands to be
installed. For example "info pretty-printer" needs the "info"
prefix to be installed. Keep things simple and just do final
script initialization here. */
finish_ext_lang_initialization ();
/* Create $_gdb_major and $_gdb_minor convenience variables. */
init_gdb_version_vars ();
}
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