gdb/mi/mi-interp.c

   1 /* MI Interpreter Definitions and Commands for GDB, the GNU debugger.
   2
   3    Copyright (C) 2002, 2003, 2004, 2005, 2007, 2008
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include "defs.h"
  22 #include "gdb_string.h"
  23 #include "interps.h"
  24 #include "event-top.h"
  25 #include "event-loop.h"
  26 #include "inferior.h"
  27 #include "ui-out.h"
  28 #include "top.h"
  29 #include "exceptions.h"
  30 #include "mi-main.h"
  31 #include "mi-cmds.h"
  32 #include "mi-out.h"
  33 #include "mi-console.h"
  34
  35 struct mi_interp
  36 {
  37   /* MI's output channels */
  38   struct ui_file *out;
  39   struct ui_file *err;
  40   struct ui_file *log;
  41   struct ui_file *targ;
  42   struct ui_file *event_channel;
  43
  44   /* This is the interpreter for the mi... */
  45   struct interp *mi2_interp;
  46   struct interp *mi1_interp;
  47   struct interp *mi_interp;
  48 };
  49
  50 /* These are the interpreter setup, etc. functions for the MI interpreter */
  51 static void mi_execute_command_wrapper (char *cmd);
  52 static void mi_command_loop (int mi_version);
  53
  54 /* These are hooks that we put in place while doing interpreter_exec
  55    so we can report interesting things that happened "behind the mi's
  56    back" in this command */
  57 static int mi_interp_query_hook (const char *ctlstr, va_list ap)
  58      ATTR_FORMAT (printf, 1, 0);
  59
  60 static void mi3_command_loop (void);
  61 static void mi2_command_loop (void);
  62 static void mi1_command_loop (void);
  63
  64 static void mi_insert_notify_hooks (void);
  65 static void mi_remove_notify_hooks (void);
  66
  67 static void *
  68 mi_interpreter_init (void)
  69 {
  70   struct mi_interp *mi = XMALLOC (struct mi_interp);
  71
  72   /* HACK: We need to force stdout/stderr to point at the console.  This avoids
  73      any potential side effects caused by legacy code that is still
  74      using the TUI / fputs_unfiltered_hook.  So we set up output channels for
  75      this now, and swap them in when we are run. */
  76
  77   raw_stdout = stdio_fileopen (stdout);
  78
  79   /* Create MI channels */
  80   mi->out = mi_console_file_new (raw_stdout, "~", '"');
  81   mi->err = mi_console_file_new (raw_stdout, "&", '"');
  82   mi->log = mi->err;
  83   mi->targ = mi_console_file_new (raw_stdout, "@", '"');
  84   mi->event_channel = mi_console_file_new (raw_stdout, "=", 0);
  85
  86   return mi;
  87 }
  88
  89 static int
  90 mi_interpreter_resume (void *data)
  91 {
  92   struct mi_interp *mi = data;
  93   /* As per hack note in mi_interpreter_init, swap in the output channels... */
  94
  95   gdb_setup_readline ();
  96
  97   /* These overwrite some of the initialization done in
  98      _intialize_event_loop.  */
  99   call_readline = gdb_readline2;
 100   input_handler = mi_execute_command_wrapper;
 101   add_file_handler (input_fd, stdin_event_handler, 0);
 102   async_command_editing_p = 0;
 103   /* FIXME: This is a total hack for now.  PB's use of the MI
 104      implicitly relies on a bug in the async support which allows
 105      asynchronous commands to leak through the commmand loop.  The bug
 106      involves (but is not limited to) the fact that sync_execution was
 107      erroneously initialized to 0.  Duplicate by initializing it thus
 108      here...  */
 109   sync_execution = 0;
 110
 111   gdb_stdout = mi->out;
 112   /* Route error and log output through the MI */
 113   gdb_stderr = mi->err;
 114   gdb_stdlog = mi->log;
 115   /* Route target output through the MI. */
 116   gdb_stdtarg = mi->targ;
 117   /* Route target error through the MI as well. */
 118   gdb_stdtargerr = mi->targ;
 119
 120   /* Replace all the hooks that we know about.  There really needs to
 121      be a better way of doing this... */
 122   clear_interpreter_hooks ();
 123
 124   deprecated_show_load_progress = mi_load_progress;
 125
 126   /* If we're _the_ interpreter, take control. */
 127   if (current_interp_named_p (INTERP_MI1))
 128     deprecated_command_loop_hook = mi1_command_loop;
 129   else if (current_interp_named_p (INTERP_MI2))
 130     deprecated_command_loop_hook = mi2_command_loop;
 131   else if (current_interp_named_p (INTERP_MI3))
 132     deprecated_command_loop_hook = mi3_command_loop;
 133   else
 134     deprecated_command_loop_hook = mi2_command_loop;
 135
 136   return 1;
 137 }
 138
 139 static int
 140 mi_interpreter_suspend (void *data)
 141 {
 142   gdb_disable_readline ();
 143   return 1;
 144 }
 145
 146 static struct gdb_exception
 147 mi_interpreter_exec (void *data, const char *command)
 148 {
 149   static struct gdb_exception ok;
 150   char *tmp = alloca (strlen (command) + 1);
 151   strcpy (tmp, command);
 152   mi_execute_command_wrapper (tmp);
 153   return exception_none;
 154 }
 155
 156 /* Never display the default gdb prompt in mi case.  */
 157 static int
 158 mi_interpreter_prompt_p (void *data)
 159 {
 160   return 0;
 161 }
 162
 163 static void
 164 mi_interpreter_exec_continuation (struct continuation_arg *arg)
 165 {
 166   bpstat_do_actions (&stop_bpstat);
 167   if (!target_executing)
 168     {
 169       fputs_unfiltered ("*stopped", raw_stdout);
 170       mi_out_put (uiout, raw_stdout);
 171       fputs_unfiltered ("\n", raw_stdout);
 172       fputs_unfiltered ("(gdb) \n", raw_stdout);
 173       gdb_flush (raw_stdout);
 174       do_exec_cleanups (ALL_CLEANUPS);
 175     }
 176   else if (target_can_async_p ())
 177     {
 178       add_continuation (mi_interpreter_exec_continuation, NULL);
 179     }
 180 }
 181
 182 enum mi_cmd_result
 183 mi_cmd_interpreter_exec (char *command, char **argv, int argc)
 184 {
 185   struct interp *interp_to_use;
 186   enum mi_cmd_result result = MI_CMD_DONE;
 187   int i;
 188   struct interp_procs *procs;
 189
 190   if (argc < 2)
 191     {
 192       mi_error_message = xstrprintf ("mi_cmd_interpreter_exec: Usage: -interpreter-exec interp command");
 193       return MI_CMD_ERROR;
 194     }
 195
 196   interp_to_use = interp_lookup (argv[0]);
 197   if (interp_to_use == NULL)
 198     {
 199       mi_error_message = xstrprintf ("mi_cmd_interpreter_exec: could not find interpreter \"%s\"", argv[0]);
 200       return MI_CMD_ERROR;
 201     }
 202
 203   if (!interp_exec_p (interp_to_use))
 204     {
 205       mi_error_message = xstrprintf ("mi_cmd_interpreter_exec: interpreter \"%s\" does not support command execution",
 206                                      argv[0]);
 207       return MI_CMD_ERROR;
 208     }
 209
 210   /* Insert the MI out hooks, making sure to also call the interpreter's hooks
 211      if it has any. */
 212   /* KRS: We shouldn't need this... Events should be installed and they should
 213      just ALWAYS fire something out down the MI channel... */
 214   mi_insert_notify_hooks ();
 215
 216   /* Now run the code... */
 217
 218   for (i = 1; i < argc; i++)
 219     {
 220       /* We had to set sync_execution = 0 for the mi (well really for Project
 221          Builder's use of the mi - particularly so interrupting would work.
 222          But for console commands to work, we need to initialize it to 1 -
 223          since that is what the cli expects - before running the command,
 224          and then set it back to 0 when we are done. */
 225       sync_execution = 1;
 226       {
 227         struct gdb_exception e = interp_exec (interp_to_use, argv[i]);
 228         if (e.reason < 0)
 229           {
 230             mi_error_message = xstrdup (e.message);
 231             result = MI_CMD_ERROR;
 232             break;
 233           }
 234       }
 235       do_exec_error_cleanups (ALL_CLEANUPS);
 236       sync_execution = 0;
 237     }
 238
 239   mi_remove_notify_hooks ();
 240
 241   /* Okay, now let's see if the command set the inferior going...
 242      Tricky point - have to do this AFTER resetting the interpreter, since
 243      changing the interpreter will clear out all the continuations for
 244      that interpreter... */
 245
 246   if (target_can_async_p () && target_executing)
 247     {
 248       fputs_unfiltered ("^running\n", raw_stdout);
 249       add_continuation (mi_interpreter_exec_continuation, NULL);
 250     }
 251
 252   return result;
 253 }
 254
 255 /*
 256  * mi_insert_notify_hooks - This inserts a number of hooks that are meant to produce
 257  * async-notify ("=") MI messages while running commands in another interpreter
 258  * using mi_interpreter_exec.  The canonical use for this is to allow access to
 259  * the gdb CLI interpreter from within the MI, while still producing MI style output
 260  * when actions in the CLI command change gdb's state.
 261 */
 262
 263 static void
 264 mi_insert_notify_hooks (void)
 265 {
 266   deprecated_query_hook = mi_interp_query_hook;
 267 }
 268
 269 static void
 270 mi_remove_notify_hooks (void)
 271 {
 272   deprecated_query_hook = NULL;
 273 }
 274
 275 static int
 276 mi_interp_query_hook (const char *ctlstr, va_list ap)
 277 {
 278   return 1;
 279 }
 280
 281 static void
 282 mi_execute_command_wrapper (char *cmd)
 283 {
 284   mi_execute_command (cmd, stdin == instream);
 285 }
 286
 287 static void
 288 mi1_command_loop (void)
 289 {
 290   mi_command_loop (1);
 291 }
 292
 293 static void
 294 mi2_command_loop (void)
 295 {
 296   mi_command_loop (2);
 297 }
 298
 299 static void
 300 mi3_command_loop (void)
 301 {
 302   mi_command_loop (3);
 303 }
 304
 305 static void
 306 mi_command_loop (int mi_version)
 307 {
 308   /* Turn off 8 bit strings in quoted output.  Any character with the
 309      high bit set is printed using C's octal format. */
 310   sevenbit_strings = 1;
 311   /* Tell the world that we're alive */
 312   fputs_unfiltered ("(gdb) \n", raw_stdout);
 313   gdb_flush (raw_stdout);
 314   start_event_loop ();
 315 }
 316
 317 extern initialize_file_ftype _initialize_mi_interp; /* -Wmissing-prototypes */
 318
 319 void
 320 _initialize_mi_interp (void)
 321 {
 322   static const struct interp_procs procs =
 323   {
 324     mi_interpreter_init,        /* init_proc */
 325     mi_interpreter_resume,      /* resume_proc */
 326     mi_interpreter_suspend,     /* suspend_proc */
 327     mi_interpreter_exec,        /* exec_proc */
 328     mi_interpreter_prompt_p     /* prompt_proc_p */
 329   };
 330
 331   /* The various interpreter levels.  */
 332   interp_add (interp_new (INTERP_MI1, NULL, mi_out_new (1), &procs));
 333   interp_add (interp_new (INTERP_MI2, NULL, mi_out_new (2), &procs));
 334   interp_add (interp_new (INTERP_MI3, NULL, mi_out_new (3), &procs));
 335
 336   /* "mi" selects the most recent released version.  "mi2" was
 337      released as part of GDB 6.0.  */
 338   interp_add (interp_new (INTERP_MI, NULL, mi_out_new (2), &procs));
 339 }