gdb/tui/tui-interp.c

   1 /* TUI Interpreter definitions for GDB, the GNU debugger.
   2
   3    Copyright (C) 2003-2014 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "interps.h"
  22 #include "top.h"
  23 #include "event-top.h"
  24 #include "event-loop.h"
  25 #include "ui-out.h"
  26 #include "cli-out.h"
  27 #include "tui/tui-data.h"
  28 #include "readline/readline.h"
  29 #include "tui/tui-win.h"
  30 #include "tui/tui.h"
  31 #include "tui/tui-io.h"
  32 #include "exceptions.h"
  33 #include "infrun.h"
  34 #include "observer.h"
  35
  36 static struct ui_out *tui_ui_out (struct interp *self);
  37
  38 /* Set to 1 when the TUI mode must be activated when we first start
  39    gdb.  */
  40 static int tui_start_enabled = 0;
  41
  42 /* The TUI interpreter.  */
  43 static struct interp *tui_interp;
  44
  45 /* Cleanup the tui before exiting.  */
  46
  47 static void
  48 tui_exit (void)
  49 {
  50   /* Disable the tui.  Curses mode is left leaving the screen in a
  51      clean state (see endwin()).  */
  52   tui_disable ();
  53 }
  54
  55 /* True if TUI is the top-level interpreter.  */
  56 static int tui_is_toplevel = 0;
  57
  58 /* Observers for several run control events.  If the interpreter is
  59    quiet (i.e., another interpreter is being run with
  60    interpreter-exec), print nothing.  */
  61
  62 /* Observer for the signal_received notification.  */
  63
  64 static void
  65 tui_on_signal_received (enum gdb_signal siggnal)
  66 {
  67   if (!interp_quiet_p (tui_interp))
  68     print_signal_received_reason (tui_ui_out (tui_interp), siggnal);
  69 }
  70
  71 /* Observer for the end_stepping_range notification.  */
  72
  73 static void
  74 tui_on_end_stepping_range (void)
  75 {
  76   if (!interp_quiet_p (tui_interp))
  77     print_end_stepping_range_reason (tui_ui_out (tui_interp));
  78 }
  79
  80 /* Observer for the signal_exited notification.  */
  81
  82 static void
  83 tui_on_signal_exited (enum gdb_signal siggnal)
  84 {
  85   if (!interp_quiet_p (tui_interp))
  86     print_signal_exited_reason (tui_ui_out (tui_interp), siggnal);
  87 }
  88
  89 /* Observer for the exited notification.  */
  90
  91 static void
  92 tui_on_exited (int exitstatus)
  93 {
  94   if (!interp_quiet_p (tui_interp))
  95     print_exited_reason (tui_ui_out (tui_interp), exitstatus);
  96 }
  97
  98 /* Observer for the no_history notification.  */
  99
 100 static void
 101 tui_on_no_history (void)
 102 {
 103   if (!interp_quiet_p (tui_interp))
 104     print_no_history_reason (tui_ui_out (tui_interp));
 105 }
 106
 107 /* These implement the TUI interpreter.  */
 108
 109 static void *
 110 tui_init (struct interp *self, int top_level)
 111 {
 112   tui_is_toplevel = top_level;
 113
 114   /* Install exit handler to leave the screen in a good shape.  */
 115   atexit (tui_exit);
 116
 117   tui_initialize_static_data ();
 118
 119   tui_initialize_io ();
 120   tui_initialize_win ();
 121   if (ui_file_isatty (gdb_stdout))
 122     tui_initialize_readline ();
 123
 124   /* If changing this, remember to update cli-interp.c as well.  */
 125   observer_attach_signal_received (tui_on_signal_received);
 126   observer_attach_end_stepping_range (tui_on_end_stepping_range);
 127   observer_attach_signal_exited (tui_on_signal_exited);
 128   observer_attach_exited (tui_on_exited);
 129   observer_attach_no_history (tui_on_no_history);
 130
 131   return NULL;
 132 }
 133
 134 /* True if enabling the TUI is allowed.  Example, if the top level
 135    interpreter is MI, enabling curses will certainly lose.  */
 136
 137 int
 138 tui_allowed_p (void)
 139 {
 140   /* Only if TUI is the top level interpreter.  Also don't try to
 141      setup curses (and print funny control characters) if we're not
 142      outputting to a terminal.  */
 143   return tui_is_toplevel && ui_file_isatty (gdb_stdout);
 144 }
 145
 146 static int
 147 tui_resume (void *data)
 148 {
 149   struct ui_file *stream;
 150
 151   /* gdb_setup_readline will change gdb_stdout.  If the TUI was
 152      previously writing to gdb_stdout, then set it to the new
 153      gdb_stdout afterwards.  */
 154
 155   stream = cli_out_set_stream (tui_old_uiout, gdb_stdout);
 156   if (stream != gdb_stdout)
 157     {
 158       cli_out_set_stream (tui_old_uiout, stream);
 159       stream = NULL;
 160     }
 161
 162   gdb_setup_readline ();
 163
 164   if (stream != NULL)
 165     cli_out_set_stream (tui_old_uiout, gdb_stdout);
 166
 167   if (tui_start_enabled)
 168     tui_enable ();
 169   return 1;
 170 }
 171
 172 static int
 173 tui_suspend (void *data)
 174 {
 175   tui_start_enabled = tui_active;
 176   tui_disable ();
 177   return 1;
 178 }
 179
 180 /* Display the prompt if we are silent.  */
 181
 182 static int
 183 tui_display_prompt_p (void *data)
 184 {
 185   if (interp_quiet_p (NULL))
 186     return 0;
 187   else
 188     return 1;
 189 }
 190
 191 static struct ui_out *
 192 tui_ui_out (struct interp *self)
 193 {
 194   if (tui_active)
 195     return tui_out;
 196   else
 197     return tui_old_uiout;
 198 }
 199
 200 static struct gdb_exception
 201 tui_exec (void *data, const char *command_str)
 202 {
 203   internal_error (__FILE__, __LINE__, _("tui_exec called"));
 204 }
 205
 206 /* Provide a prototype to silence -Wmissing-prototypes.  */
 207 extern initialize_file_ftype _initialize_tui_interp;
 208
 209 void
 210 _initialize_tui_interp (void)
 211 {
 212   static const struct interp_procs procs = {
 213     tui_init,
 214     tui_resume,
 215     tui_suspend,
 216     tui_exec,
 217     tui_display_prompt_p,
 218     tui_ui_out,
 219     NULL,
 220     cli_command_loop
 221   };
 222
 223   /* Create a default uiout builder for the TUI.  */
 224   tui_interp = interp_new (INTERP_TUI, &procs);
 225   interp_add (tui_interp);
 226   if (interpreter_p && strcmp (interpreter_p, INTERP_TUI) == 0)
 227     tui_start_enabled = 1;
 228
 229   if (interpreter_p && strcmp (interpreter_p, INTERP_CONSOLE) == 0)
 230     {
 231       xfree (interpreter_p);
 232       interpreter_p = xstrdup (INTERP_TUI);
 233     }
 234 }