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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [gdb/] [tui/] [tui-interp.c] - Blame information for rev 233

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1 24 jeremybenn
/* TUI Interpreter definitions for GDB, the GNU debugger.
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   Copyright (C) 2003, 2007, 2008 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 (void)
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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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          /* 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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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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