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/* TUI Interpreter definitions for GDB, the GNU debugger.
Copyright (C) 2003, 2007, 2008, 2009, 2010 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 "interps.h"
#include "top.h"
#include "event-top.h"
#include "event-loop.h"
#include "ui-out.h"
#include "cli-out.h"
#include "tui/tui-data.h"
#include "readline/readline.h"
#include "tui/tui-win.h"
#include "tui/tui.h"
#include "tui/tui-io.h"
#include "exceptions.h"
/* Set to 1 when the TUI mode must be activated when we first start
gdb. */
static int tui_start_enabled = 0;
/* Cleanup the tui before exiting. */
static void
tui_exit (void)
{
/* Disable the tui. Curses mode is left leaving the screen in a
clean state (see endwin()). */
tui_disable ();
}
/* True if TUI is the top-level interpreter. */
static int tui_is_toplevel = 0;
/* These implement the TUI interpreter. */
static void *
tui_init (int top_level)
{
tui_is_toplevel = top_level;
/* Install exit handler to leave the screen in a good shape. */
atexit (tui_exit);
tui_initialize_static_data ();
tui_initialize_io ();
tui_initialize_win ();
if (ui_file_isatty (gdb_stdout))
tui_initialize_readline ();
return NULL;
}
/* True if enabling the TUI is allowed. Example, if the top level
interpreter is MI, enabling curses will certainly lose. */
int
tui_allowed_p (void)
{
/* Only if TUI is the top level interpreter. Also don't try to
setup curses (and print funny control characters) if we're not
outputting to a terminal. */
return tui_is_toplevel && ui_file_isatty (gdb_stdout);
}
static int
tui_resume (void *data)
{
struct ui_file *stream;
/* gdb_setup_readline will change gdb_stdout. If the TUI was
previously writing to gdb_stdout, then set it to the new
gdb_stdout afterwards. */
stream = cli_out_set_stream (tui_old_uiout, gdb_stdout);
if (stream != gdb_stdout)
{
cli_out_set_stream (tui_old_uiout, stream);
stream = NULL;
}
gdb_setup_readline ();
if (stream != NULL)
cli_out_set_stream (tui_old_uiout, gdb_stdout);
if (tui_start_enabled)
tui_enable ();
return 1;
}
static int
tui_suspend (void *data)
{
tui_start_enabled = tui_active;
tui_disable ();
return 1;
}
/* Display the prompt if we are silent. */
static int
tui_display_prompt_p (void *data)
{
if (interp_quiet_p (NULL))
return 0;
else
return 1;
}
static struct gdb_exception
tui_exec (void *data, const char *command_str)
{
internal_error (__FILE__, __LINE__, _("tui_exec called"));
}
/* Initialize all the necessary variables, start the event loop,
register readline, and stdin, start the loop. */
static void
tui_command_loop (void *data)
{
/* If we are using readline, set things up and display the first
prompt, otherwise just print the prompt. */
if (async_command_editing_p)
{
int length;
char *a_prompt;
char *gdb_prompt = get_prompt ();
/* Tell readline what the prompt to display is and what function
it will need to call after a whole line is read. This also
displays the first prompt. */
length = strlen (PREFIX (0))
+ strlen (gdb_prompt) + strlen (SUFFIX (0)) + 1;
a_prompt = (char *) alloca (length);
strcpy (a_prompt, PREFIX (0));
strcat (a_prompt, gdb_prompt);
strcat (a_prompt, SUFFIX (0));
rl_callback_handler_install (a_prompt, input_handler);
}
else
display_gdb_prompt (0);
/* Loop until there is nothing to do. This is the entry point to the
event loop engine. gdb_do_one_event, called via catch_errors()
will process one event for each invocation. It blocks waits for
an event and then processes it. >0 when an event is processed, 0
when catch_errors() caught an error and <0 when there are no
longer any event sources registered. */
while (1)
{
int result = catch_errors (gdb_do_one_event, 0, "", RETURN_MASK_ALL);
if (result < 0)
break;
/* Update gdb output according to TUI mode. Since catch_errors
preserves the uiout from changing, this must be done at top
level of event loop. */
if (tui_active)
uiout = tui_out;
else
uiout = tui_old_uiout;
if (result == 0)
{
/* If any exception escaped to here, we better enable
stdin. Otherwise, any command that calls async_disable_stdin,
and then throws, will leave stdin inoperable. */
async_enable_stdin ();
/* FIXME: this should really be a call to a hook that is
interface specific, because interfaces can display the
prompt in their own way. */
display_gdb_prompt (0);
/* This call looks bizarre, but it is required. If the user
entered a command that caused an error,
after_char_processing_hook won't be called from
rl_callback_read_char_wrapper. Using a cleanup there
won't work, since we want this function to be called
after a new prompt is printed. */
if (after_char_processing_hook)
(*after_char_processing_hook) ();
/* Maybe better to set a flag to be checked somewhere as to
whether display the prompt or not. */
}
}
/* We are done with the event loop. There are no more event sources
to listen to. So we exit GDB. */
return;
}
/* Provide a prototype to silence -Wmissing-prototypes. */
extern initialize_file_ftype _initialize_tui_interp;
void
_initialize_tui_interp (void)
{
static const struct interp_procs procs = {
tui_init,
tui_resume,
tui_suspend,
tui_exec,
tui_display_prompt_p,
tui_command_loop,
};
/* Create a default uiout builder for the TUI. */
tui_out = tui_out_new (gdb_stdout);
interp_add (interp_new (INTERP_TUI, NULL, tui_out, &procs));
if (interpreter_p && strcmp (interpreter_p, INTERP_TUI) == 0)
tui_start_enabled = 1;
if (interpreter_p && strcmp (interpreter_p, INTERP_CONSOLE) == 0)
{
xfree (interpreter_p);
interpreter_p = xstrdup (INTERP_TUI);
}
}
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