gdb/cli/cli-interp.c

   1 /* CLI Definitions for GDB, the GNU debugger.
   2
   3    Copyright (C) 2002-2016 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 "event-top.h"
  23 #include "ui-out.h"
  24 #include "cli-out.h"
  25 #include "top.h"                /* for "execute_command" */
  26 #include "infrun.h"
  27 #include "observer.h"
  28
  29 /* The console interpreter.  */
  30 struct cli_interp
  31 {
  32   /* The ui_out for the console interpreter.  */
  33   struct ui_out *cli_uiout;
  34 };
  35
  36 /* The interpreter for the console interpreter.  */
  37 static struct interp *cli_interp;
  38
  39 /* Longjmp-safe wrapper for "execute_command".  */
  40 static struct gdb_exception safe_execute_command (struct ui_out *uiout,
  41                                                   char *command,
  42                                                   int from_tty);
  43
  44 /* Observers for several run control events.  If the interpreter is
  45    quiet (i.e., another interpreter is being run with
  46    interpreter-exec), print nothing.  */
  47
  48 /* Observer for the normal_stop notification.  */
  49
  50 static void
  51 cli_on_normal_stop (struct bpstats *bs, int print_frame)
  52 {
  53   if (!interp_quiet_p (cli_interp))
  54     {
  55       if (print_frame)
  56         print_stop_event (interp_ui_out (cli_interp));
  57     }
  58 }
  59
  60 /* Observer for the signal_received notification.  */
  61
  62 static void
  63 cli_on_signal_received (enum gdb_signal siggnal)
  64 {
  65   if (!interp_quiet_p (cli_interp))
  66     print_signal_received_reason (interp_ui_out (cli_interp), siggnal);
  67 }
  68
  69 /* Observer for the end_stepping_range notification.  */
  70
  71 static void
  72 cli_on_end_stepping_range (void)
  73 {
  74   if (!interp_quiet_p (cli_interp))
  75     print_end_stepping_range_reason (interp_ui_out (cli_interp));
  76 }
  77
  78 /* Observer for the signalled notification.  */
  79
  80 static void
  81 cli_on_signal_exited (enum gdb_signal siggnal)
  82 {
  83   if (!interp_quiet_p (cli_interp))
  84     print_signal_exited_reason (interp_ui_out (cli_interp), siggnal);
  85 }
  86
  87 /* Observer for the exited notification.  */
  88
  89 static void
  90 cli_on_exited (int exitstatus)
  91 {
  92   if (!interp_quiet_p (cli_interp))
  93     print_exited_reason (interp_ui_out (cli_interp), exitstatus);
  94 }
  95
  96 /* Observer for the no_history notification.  */
  97
  98 static void
  99 cli_on_no_history (void)
 100 {
 101   if (!interp_quiet_p (cli_interp))
 102     print_no_history_reason (interp_ui_out (cli_interp));
 103 }
 104
 105 /* Observer for the sync_execution_done notification.  */
 106
 107 static void
 108 cli_on_sync_execution_done (void)
 109 {
 110   if (!interp_quiet_p (cli_interp))
 111     display_gdb_prompt (NULL);
 112 }
 113
 114 /* Observer for the command_error notification.  */
 115
 116 static void
 117 cli_on_command_error (void)
 118 {
 119   if (!interp_quiet_p (cli_interp))
 120     display_gdb_prompt (NULL);
 121 }
 122
 123 /* These implement the cli out interpreter: */
 124
 125 static void *
 126 cli_interpreter_init (struct interp *self, int top_level)
 127 {
 128   if (top_level)
 129     cli_interp = self;
 130
 131   /* If changing this, remember to update tui-interp.c as well.  */
 132   observer_attach_normal_stop (cli_on_normal_stop);
 133   observer_attach_end_stepping_range (cli_on_end_stepping_range);
 134   observer_attach_signal_received (cli_on_signal_received);
 135   observer_attach_signal_exited (cli_on_signal_exited);
 136   observer_attach_exited (cli_on_exited);
 137   observer_attach_no_history (cli_on_no_history);
 138   observer_attach_sync_execution_done (cli_on_sync_execution_done);
 139   observer_attach_command_error (cli_on_command_error);
 140
 141   return interp_data (self);
 142 }
 143
 144 static int
 145 cli_interpreter_resume (void *data)
 146 {
 147   struct cli_interp *cli = (struct cli_interp *) data;
 148   struct ui_file *stream;
 149
 150   /*sync_execution = 1; */
 151
 152   /* gdb_setup_readline will change gdb_stdout.  If the CLI was
 153      previously writing to gdb_stdout, then set it to the new
 154      gdb_stdout afterwards.  */
 155
 156   stream = cli_out_set_stream (cli->cli_uiout, gdb_stdout);
 157   if (stream != gdb_stdout)
 158     {
 159       cli_out_set_stream (cli->cli_uiout, stream);
 160       stream = NULL;
 161     }
 162
 163   gdb_setup_readline ();
 164
 165   if (stream != NULL)
 166     cli_out_set_stream (cli->cli_uiout, gdb_stdout);
 167
 168   return 1;
 169 }
 170
 171 static int
 172 cli_interpreter_suspend (void *data)
 173 {
 174   gdb_disable_readline ();
 175   return 1;
 176 }
 177
 178 static struct gdb_exception
 179 cli_interpreter_exec (void *data, const char *command_str)
 180 {
 181   struct cli_interp *cli = (struct cli_interp *) data;
 182   struct ui_file *old_stream;
 183   struct gdb_exception result;
 184
 185   /* FIXME: cagney/2003-02-01: Need to const char *propogate
 186      safe_execute_command.  */
 187   char *str = (char *) alloca (strlen (command_str) + 1);
 188   strcpy (str, command_str);
 189
 190   /* gdb_stdout could change between the time cli_uiout was
 191      initialized and now.  Since we're probably using a different
 192      interpreter which has a new ui_file for gdb_stdout, use that one
 193      instead of the default.
 194
 195      It is important that it gets reset everytime, since the user
 196      could set gdb to use a different interpreter.  */
 197   old_stream = cli_out_set_stream (cli->cli_uiout, gdb_stdout);
 198   result = safe_execute_command (cli->cli_uiout, str, 1);
 199   cli_out_set_stream (cli->cli_uiout, old_stream);
 200   return result;
 201 }
 202
 203 static struct gdb_exception
 204 safe_execute_command (struct ui_out *command_uiout, char *command, int from_tty)
 205 {
 206   struct gdb_exception e = exception_none;
 207   struct ui_out *saved_uiout;
 208
 209   /* Save and override the global ``struct ui_out'' builder.  */
 210   saved_uiout = current_uiout;
 211   current_uiout = command_uiout;
 212
 213   TRY
 214     {
 215       execute_command (command, from_tty);
 216     }
 217   CATCH (exception, RETURN_MASK_ALL)
 218     {
 219       e = exception;
 220     }
 221   END_CATCH
 222
 223   /* Restore the global builder.  */
 224   current_uiout = saved_uiout;
 225
 226   /* FIXME: cagney/2005-01-13: This shouldn't be needed.  Instead the
 227      caller should print the exception.  */
 228   exception_print (gdb_stderr, e);
 229   return e;
 230 }
 231
 232 static struct ui_out *
 233 cli_ui_out (struct interp *self)
 234 {
 235   struct cli_interp *cli = (struct cli_interp *) interp_data (self);
 236
 237   return cli->cli_uiout;
 238 }
 239
 240 /* The CLI interpreter's vtable.  */
 241
 242 static const struct interp_procs cli_interp_procs = {
 243   cli_interpreter_init,         /* init_proc */
 244   cli_interpreter_resume,       /* resume_proc */
 245   cli_interpreter_suspend,      /* suspend_proc */
 246   cli_interpreter_exec,         /* exec_proc */
 247   cli_ui_out,                   /* ui_out_proc */
 248   NULL,                         /* set_logging_proc */
 249   cli_command_loop              /* command_loop_proc */
 250 };
 251
 252 /* Factory for CLI interpreters.  */
 253
 254 static struct interp *
 255 cli_interp_factory (const char *name)
 256 {
 257   struct cli_interp *cli = XNEW (struct cli_interp);
 258
 259   /* Create a default uiout builder for the CLI.  */
 260   cli->cli_uiout = cli_out_new (gdb_stdout);
 261
 262   return interp_new (name, &cli_interp_procs, cli);
 263 }
 264
 265 /* Standard gdb initialization hook.  */
 266 extern initialize_file_ftype _initialize_cli_interp; /* -Wmissing-prototypes */
 267
 268 void
 269 _initialize_cli_interp (void)
 270 {
 271   interp_factory_register (INTERP_CONSOLE, cli_interp_factory);
 272 }