gdb/tui/tui-interp.c

   1 /* TUI Interpreter definitions for GDB, the GNU debugger.
   2
   3    Copyright (C) 2003-2015 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 "infrun.h"
  33 #include "observer.h"
  34
  35 static struct ui_out *tui_ui_out (struct interp *self);
  36
  37 /* Set to 1 when the TUI mode must be activated when we first start
  38    gdb.  */
  39 static int tui_start_enabled = 0;
  40
  41 /* The TUI interpreter.  */
  42 static struct interp *tui_interp;
  43
  44 /* Cleanup the tui before exiting.  */
  45
  46 static void
  47 tui_exit (void)
  48 {
  49   /* Disable the tui.  Curses mode is left leaving the screen in a
  50      clean state (see endwin()).  */
  51   tui_disable ();
  52 }
  53
  54 /* Observers for several run control events.  If the interpreter is
  55    quiet (i.e., another interpreter is being run with
  56    interpreter-exec), print nothing.  */
  57
  58 /* Observer for the signal_received notification.  */
  59
  60 static void
  61 tui_on_signal_received (enum gdb_signal siggnal)
  62 {
  63   if (!interp_quiet_p (tui_interp))
  64     print_signal_received_reason (tui_ui_out (tui_interp), siggnal);
  65 }
  66
  67 /* Observer for the end_stepping_range notification.  */
  68
  69 static void
  70 tui_on_end_stepping_range (void)
  71 {
  72   if (!interp_quiet_p (tui_interp))
  73     print_end_stepping_range_reason (tui_ui_out (tui_interp));
  74 }
  75
  76 /* Observer for the signal_exited notification.  */
  77
  78 static void
  79 tui_on_signal_exited (enum gdb_signal siggnal)
  80 {
  81   if (!interp_quiet_p (tui_interp))
  82     print_signal_exited_reason (tui_ui_out (tui_interp), siggnal);
  83 }
  84
  85 /* Observer for the exited notification.  */
  86
  87 static void
  88 tui_on_exited (int exitstatus)
  89 {
  90   if (!interp_quiet_p (tui_interp))
  91     print_exited_reason (tui_ui_out (tui_interp), exitstatus);
  92 }
  93
  94 /* Observer for the no_history notification.  */
  95
  96 static void
  97 tui_on_no_history (void)
  98 {
  99   if (!interp_quiet_p (tui_interp))
 100     print_no_history_reason (tui_ui_out (tui_interp));
 101 }
 102
 103 /* Observer for the sync_execution_done notification.  */
 104
 105 static void
 106 tui_on_sync_execution_done (void)
 107 {
 108   if (!interp_quiet_p (tui_interp))
 109     display_gdb_prompt (NULL);
 110 }
 111
 112 /* Observer for the command_error notification.  */
 113
 114 static void
 115 tui_on_command_error (void)
 116 {
 117   if (!interp_quiet_p (tui_interp))
 118     display_gdb_prompt (NULL);
 119 }
 120
 121 /* These implement the TUI interpreter.  */
 122
 123 static void *
 124 tui_init (struct interp *self, int top_level)
 125 {
 126   /* Install exit handler to leave the screen in a good shape.  */
 127   atexit (tui_exit);
 128
 129   tui_initialize_static_data ();
 130
 131   tui_initialize_io ();
 132   tui_initialize_win ();
 133   if (ui_file_isatty (gdb_stdout))
 134     tui_initialize_readline ();
 135
 136   /* If changing this, remember to update cli-interp.c as well.  */
 137   observer_attach_signal_received (tui_on_signal_received);
 138   observer_attach_end_stepping_range (tui_on_end_stepping_range);
 139   observer_attach_signal_exited (tui_on_signal_exited);
 140   observer_attach_exited (tui_on_exited);
 141   observer_attach_no_history (tui_on_no_history);
 142   observer_attach_sync_execution_done (tui_on_sync_execution_done);
 143   observer_attach_command_error (tui_on_command_error);
 144
 145   return NULL;
 146 }
 147
 148 static int
 149 tui_resume (void *data)
 150 {
 151   struct ui_file *stream;
 152
 153   /* gdb_setup_readline will change gdb_stdout.  If the TUI was
 154      previously writing to gdb_stdout, then set it to the new
 155      gdb_stdout afterwards.  */
 156
 157   stream = cli_out_set_stream (tui_old_uiout, gdb_stdout);
 158   if (stream != gdb_stdout)
 159     {
 160       cli_out_set_stream (tui_old_uiout, stream);
 161       stream = NULL;
 162     }
 163
 164   gdb_setup_readline ();
 165
 166   if (stream != NULL)
 167     cli_out_set_stream (tui_old_uiout, gdb_stdout);
 168
 169   if (tui_start_enabled)
 170     tui_enable ();
 171   return 1;
 172 }
 173
 174 static int
 175 tui_suspend (void *data)
 176 {
 177   tui_start_enabled = tui_active;
 178   tui_disable ();
 179   return 1;
 180 }
 181
 182 static struct ui_out *
 183 tui_ui_out (struct interp *self)
 184 {
 185   if (tui_active)
 186     return tui_out;
 187   else
 188     return tui_old_uiout;
 189 }
 190
 191 static struct gdb_exception
 192 tui_exec (void *data, const char *command_str)
 193 {
 194   internal_error (__FILE__, __LINE__, _("tui_exec called"));
 195 }
 196
 197 /* Provide a prototype to silence -Wmissing-prototypes.  */
 198 extern initialize_file_ftype _initialize_tui_interp;
 199
 200 void
 201 _initialize_tui_interp (void)
 202 {
 203   static const struct interp_procs procs = {
 204     tui_init,
 205     tui_resume,
 206     tui_suspend,
 207     tui_exec,
 208     tui_ui_out,
 209     NULL,
 210     cli_command_loop
 211   };
 212
 213   /* Create a default uiout builder for the TUI.  */
 214   tui_interp = interp_new (INTERP_TUI, &procs);
 215   interp_add (tui_interp);
 216   if (interpreter_p && strcmp (interpreter_p, INTERP_TUI) == 0)
 217     tui_start_enabled = 1;
 218
 219   if (interpreter_p && strcmp (interpreter_p, INTERP_CONSOLE) == 0)
 220     {
 221       xfree (interpreter_p);
 222       interpreter_p = xstrdup (INTERP_TUI);
 223     }
 224 }