gdb/cli/cli-interp.c

   1 /* CLI Definitions for GDB, the GNU debugger.
   2
   3    Copyright (C) 2002-2015 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 "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 /* These are the ui_out and the interpreter for the console
  30    interpreter.  */
  31 struct ui_out *cli_uiout;
  32 static struct interp *cli_interp;
  33
  34 /* Longjmp-safe wrapper for "execute_command".  */
  35 static struct gdb_exception safe_execute_command (struct ui_out *uiout,
  36                                                   char *command,
  37                                                   int from_tty);
  38
  39 /* Observers for several run control events.  If the interpreter is
  40    quiet (i.e., another interpreter is being run with
  41    interpreter-exec), print nothing.  */
  42
  43 /* Observer for the signal_received notification.  */
  44
  45 static void
  46 cli_on_signal_received (enum gdb_signal siggnal)
  47 {
  48   if (!interp_quiet_p (cli_interp))
  49     print_signal_received_reason (cli_uiout, siggnal);
  50 }
  51
  52 /* Observer for the end_stepping_range notification.  */
  53
  54 static void
  55 cli_on_end_stepping_range (void)
  56 {
  57   if (!interp_quiet_p (cli_interp))
  58     print_end_stepping_range_reason (cli_uiout);
  59 }
  60
  61 /* Observer for the signalled notification.  */
  62
  63 static void
  64 cli_on_signal_exited (enum gdb_signal siggnal)
  65 {
  66   if (!interp_quiet_p (cli_interp))
  67     print_signal_exited_reason (cli_uiout, siggnal);
  68 }
  69
  70 /* Observer for the exited notification.  */
  71
  72 static void
  73 cli_on_exited (int exitstatus)
  74 {
  75   if (!interp_quiet_p (cli_interp))
  76     print_exited_reason (cli_uiout, exitstatus);
  77 }
  78
  79 /* Observer for the no_history notification.  */
  80
  81 static void
  82 cli_on_no_history (void)
  83 {
  84   if (!interp_quiet_p (cli_interp))
  85     print_no_history_reason (cli_uiout);
  86 }
  87
  88 /* Observer for the sync_execution_done notification.  */
  89
  90 static void
  91 cli_on_sync_execution_done (void)
  92 {
  93   if (!interp_quiet_p (cli_interp))
  94     display_gdb_prompt (NULL);
  95 }
  96
  97 /* Observer for the command_error notification.  */
  98
  99 static void
 100 cli_on_command_error (void)
 101 {
 102   if (!interp_quiet_p (cli_interp))
 103     display_gdb_prompt (NULL);
 104 }
 105
 106 /* These implement the cli out interpreter: */
 107
 108 static void *
 109 cli_interpreter_init (struct interp *self, int top_level)
 110 {
 111   /* If changing this, remember to update tui-interp.c as well.  */
 112   observer_attach_end_stepping_range (cli_on_end_stepping_range);
 113   observer_attach_signal_received (cli_on_signal_received);
 114   observer_attach_signal_exited (cli_on_signal_exited);
 115   observer_attach_exited (cli_on_exited);
 116   observer_attach_no_history (cli_on_no_history);
 117   observer_attach_sync_execution_done (cli_on_sync_execution_done);
 118   observer_attach_command_error (cli_on_command_error);
 119
 120   return NULL;
 121 }
 122
 123 static int
 124 cli_interpreter_resume (void *data)
 125 {
 126   struct ui_file *stream;
 127
 128   /*sync_execution = 1; */
 129
 130   /* gdb_setup_readline will change gdb_stdout.  If the CLI was
 131      previously writing to gdb_stdout, then set it to the new
 132      gdb_stdout afterwards.  */
 133
 134   stream = cli_out_set_stream (cli_uiout, gdb_stdout);
 135   if (stream != gdb_stdout)
 136     {
 137       cli_out_set_stream (cli_uiout, stream);
 138       stream = NULL;
 139     }
 140
 141   gdb_setup_readline ();
 142
 143   if (stream != NULL)
 144     cli_out_set_stream (cli_uiout, gdb_stdout);
 145
 146   return 1;
 147 }
 148
 149 static int
 150 cli_interpreter_suspend (void *data)
 151 {
 152   gdb_disable_readline ();
 153   return 1;
 154 }
 155
 156 static struct gdb_exception
 157 cli_interpreter_exec (void *data, const char *command_str)
 158 {
 159   struct ui_file *old_stream;
 160   struct gdb_exception result;
 161
 162   /* FIXME: cagney/2003-02-01: Need to const char *propogate
 163      safe_execute_command.  */
 164   char *str = strcpy (alloca (strlen (command_str) + 1), command_str);
 165
 166   /* gdb_stdout could change between the time cli_uiout was
 167      initialized and now.  Since we're probably using a different
 168      interpreter which has a new ui_file for gdb_stdout, use that one
 169      instead of the default.
 170
 171      It is important that it gets reset everytime, since the user
 172      could set gdb to use a different interpreter.  */
 173   old_stream = cli_out_set_stream (cli_uiout, gdb_stdout);
 174   result = safe_execute_command (cli_uiout, str, 1);
 175   cli_out_set_stream (cli_uiout, old_stream);
 176   return result;
 177 }
 178
 179 static struct gdb_exception
 180 safe_execute_command (struct ui_out *command_uiout, char *command, int from_tty)
 181 {
 182   volatile struct gdb_exception e;
 183   struct ui_out *saved_uiout;
 184
 185   /* Save and override the global ``struct ui_out'' builder.  */
 186   saved_uiout = current_uiout;
 187   current_uiout = command_uiout;
 188
 189   TRY_CATCH (e, RETURN_MASK_ALL)
 190     {
 191       execute_command (command, from_tty);
 192     }
 193
 194   /* Restore the global builder.  */
 195   current_uiout = saved_uiout;
 196
 197   /* FIXME: cagney/2005-01-13: This shouldn't be needed.  Instead the
 198      caller should print the exception.  */
 199   exception_print (gdb_stderr, e);
 200   return e;
 201 }
 202
 203 static struct ui_out *
 204 cli_ui_out (struct interp *self)
 205 {
 206   return cli_uiout;
 207 }
 208
 209 /* Standard gdb initialization hook.  */
 210 extern initialize_file_ftype _initialize_cli_interp; /* -Wmissing-prototypes */
 211
 212 void
 213 _initialize_cli_interp (void)
 214 {
 215   static const struct interp_procs procs = {
 216     cli_interpreter_init,       /* init_proc */
 217     cli_interpreter_resume,     /* resume_proc */
 218     cli_interpreter_suspend,    /* suspend_proc */
 219     cli_interpreter_exec,       /* exec_proc */
 220     cli_ui_out,                 /* ui_out_proc */
 221     NULL,                       /* set_logging_proc */
 222     cli_command_loop            /* command_loop_proc */
 223   };
 224
 225   /* Create a default uiout builder for the CLI.  */
 226   cli_uiout = cli_out_new (gdb_stdout);
 227   cli_interp = interp_new (INTERP_CONSOLE, &procs);
 228
 229   interp_add (cli_interp);
 230 }