220 lines
6 KiB
C
220 lines
6 KiB
C
/* TUI Interpreter definitions for GDB, the GNU debugger.
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Copyright (C) 2003, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "interps.h"
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#include "top.h"
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#include "event-top.h"
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#include "event-loop.h"
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#include "ui-out.h"
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#include "cli-out.h"
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#include "tui/tui-data.h"
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#include "readline/readline.h"
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#include "tui/tui-win.h"
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#include "tui/tui.h"
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#include "tui/tui-io.h"
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#include "exceptions.h"
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/* Set to 1 when the TUI mode must be activated when we first start
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gdb. */
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static int tui_start_enabled = 0;
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/* Cleanup the tui before exiting. */
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static void
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tui_exit (void)
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{
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/* Disable the tui. Curses mode is left leaving the screen in a
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clean state (see endwin()). */
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tui_disable ();
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}
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/* These implement the TUI interpreter. */
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static void *
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tui_init (int top_level)
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{
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/* Install exit handler to leave the screen in a good shape. */
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atexit (tui_exit);
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tui_initialize_static_data ();
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tui_initialize_io ();
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tui_initialize_win ();
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tui_initialize_readline ();
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return NULL;
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}
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static int
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tui_resume (void *data)
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{
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struct ui_file *stream;
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/* gdb_setup_readline will change gdb_stdout. If the TUI was
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previously writing to gdb_stdout, then set it to the new
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gdb_stdout afterwards. */
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stream = cli_out_set_stream (tui_old_uiout, gdb_stdout);
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if (stream != gdb_stdout)
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{
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cli_out_set_stream (tui_old_uiout, stream);
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stream = NULL;
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}
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gdb_setup_readline ();
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if (stream != NULL)
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cli_out_set_stream (tui_old_uiout, gdb_stdout);
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if (tui_start_enabled)
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tui_enable ();
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return 1;
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}
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static int
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tui_suspend (void *data)
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{
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tui_start_enabled = tui_active;
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tui_disable ();
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return 1;
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}
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/* Display the prompt if we are silent. */
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static int
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tui_display_prompt_p (void *data)
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{
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if (interp_quiet_p (NULL))
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return 0;
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else
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return 1;
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}
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static struct gdb_exception
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tui_exec (void *data, const char *command_str)
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{
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internal_error (__FILE__, __LINE__, _("tui_exec called"));
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}
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/* Initialize all the necessary variables, start the event loop,
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register readline, and stdin, start the loop. */
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static void
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tui_command_loop (void *data)
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{
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/* If we are using readline, set things up and display the first
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prompt, otherwise just print the prompt. */
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if (async_command_editing_p)
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{
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int length;
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char *a_prompt;
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char *gdb_prompt = get_prompt ();
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/* Tell readline what the prompt to display is and what function
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it will need to call after a whole line is read. This also
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displays the first prompt. */
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length = strlen (PREFIX (0))
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+ strlen (gdb_prompt) + strlen (SUFFIX (0)) + 1;
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a_prompt = (char *) alloca (length);
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strcpy (a_prompt, PREFIX (0));
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strcat (a_prompt, gdb_prompt);
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strcat (a_prompt, SUFFIX (0));
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rl_callback_handler_install (a_prompt, input_handler);
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}
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else
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display_gdb_prompt (0);
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/* Loop until there is nothing to do. This is the entry point to the
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event loop engine. gdb_do_one_event, called via catch_errors()
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will process one event for each invocation. It blocks waits for
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an event and then processes it. >0 when an event is processed, 0
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when catch_errors() caught an error and <0 when there are no
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longer any event sources registered. */
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while (1)
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{
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int result = catch_errors (gdb_do_one_event, 0, "", RETURN_MASK_ALL);
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if (result < 0)
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break;
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/* Update gdb output according to TUI mode. Since catch_errors
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preserves the uiout from changing, this must be done at top
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level of event loop. */
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if (tui_active)
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uiout = tui_out;
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else
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uiout = tui_old_uiout;
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if (result == 0)
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{
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/* If any exception escaped to here, we better enable
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stdin. Otherwise, any command that calls async_disable_stdin,
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and then throws, will leave stdin inoperable. */
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async_enable_stdin ();
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/* FIXME: this should really be a call to a hook that is
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interface specific, because interfaces can display the
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prompt in their own way. */
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display_gdb_prompt (0);
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/* This call looks bizarre, but it is required. If the user
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entered a command that caused an error,
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after_char_processing_hook won't be called from
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rl_callback_read_char_wrapper. Using a cleanup there
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won't work, since we want this function to be called
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after a new prompt is printed. */
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if (after_char_processing_hook)
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(*after_char_processing_hook) ();
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/* Maybe better to set a flag to be checked somewhere as to
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whether display the prompt or not. */
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}
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}
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/* We are done with the event loop. There are no more event sources
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to listen to. So we exit GDB. */
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return;
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}
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/* Provide a prototype to silence -Wmissing-prototypes. */
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extern initialize_file_ftype _initialize_tui_interp;
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void
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_initialize_tui_interp (void)
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{
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static const struct interp_procs procs = {
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tui_init,
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tui_resume,
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tui_suspend,
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tui_exec,
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tui_display_prompt_p,
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tui_command_loop,
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};
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struct interp *tui_interp;
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/* Create a default uiout builder for the TUI. */
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tui_out = tui_out_new (gdb_stdout);
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interp_add (interp_new (INTERP_TUI, NULL, tui_out, &procs));
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if (interpreter_p && strcmp (interpreter_p, INTERP_TUI) == 0)
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tui_start_enabled = 1;
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if (interpreter_p && strcmp (interpreter_p, INTERP_CONSOLE) == 0)
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{
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xfree (interpreter_p);
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interpreter_p = xstrdup (INTERP_TUI);
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}
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}
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