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 #include "observer.h"
  35 #include "gdbthread.h"
  36
  37 struct mi_interp
  38 {
  39   /* MI's output channels */
  40   struct ui_file *out;
  41   struct ui_file *err;
  42   struct ui_file *log;
  43   struct ui_file *targ;
  44   struct ui_file *event_channel;
  45
  46   /* This is the interpreter for the mi... */
  47   struct interp *mi2_interp;
  48   struct interp *mi1_interp;
  49   struct interp *mi_interp;
  50 };
  51
  52 /* These are the interpreter setup, etc. functions for the MI interpreter */
  53 static void mi_execute_command_wrapper (char *cmd);
  54 static void mi_command_loop (int mi_version);
  55
  56 /* These are hooks that we put in place while doing interpreter_exec
  57    so we can report interesting things that happened "behind the mi's
  58    back" in this command */
  59 static int mi_interp_query_hook (const char *ctlstr, va_list ap)
  60      ATTR_FORMAT (printf, 1, 0);
  61
  62 static void mi3_command_loop (void);
  63 static void mi2_command_loop (void);
  64 static void mi1_command_loop (void);
  65
  66 static void mi_insert_notify_hooks (void);
  67 static void mi_remove_notify_hooks (void);
  68
  69 static void mi_new_thread (struct thread_info *t);
  70
  71 static void *
  72 mi_interpreter_init (int top_level)
  73 {
  74   struct mi_interp *mi = XMALLOC (struct mi_interp);
  75
  76   /* HACK: We need to force stdout/stderr to point at the console.  This avoids
  77      any potential side effects caused by legacy code that is still
  78      using the TUI / fputs_unfiltered_hook.  So we set up output channels for
  79      this now, and swap them in when we are run. */
  80
  81   raw_stdout = stdio_fileopen (stdout);
  82
  83   /* Create MI channels */
  84   mi->out = mi_console_file_new (raw_stdout, "~", '"');
  85   mi->err = mi_console_file_new (raw_stdout, "&", '"');
  86   mi->log = mi->err;
  87   mi->targ = mi_console_file_new (raw_stdout, "@", '"');
  88   mi->event_channel = mi_console_file_new (raw_stdout, "=", 0);
  89
  90   if (top_level)
  91     observer_attach_new_thread (mi_new_thread);
  92
  93   return mi;
  94 }
  95
  96 static int
  97 mi_interpreter_resume (void *data)
  98 {
  99   struct mi_interp *mi = data;
 100   /* As per hack note in mi_interpreter_init, swap in the output channels... */
 101
 102   gdb_setup_readline ();
 103
 104   /* These overwrite some of the initialization done in
 105      _intialize_event_loop.  */
 106   call_readline = gdb_readline2;
 107   input_handler = mi_execute_command_wrapper;
 108   add_file_handler (input_fd, stdin_event_handler, 0);
 109   async_command_editing_p = 0;
 110   /* FIXME: This is a total hack for now.  PB's use of the MI
 111      implicitly relies on a bug in the async support which allows
 112      asynchronous commands to leak through the commmand loop.  The bug
 113      involves (but is not limited to) the fact that sync_execution was
 114      erroneously initialized to 0.  Duplicate by initializing it thus
 115      here...  */
 116   sync_execution = 0;
 117
 118   gdb_stdout = mi->out;
 119   /* Route error and log output through the MI */
 120   gdb_stderr = mi->err;
 121   gdb_stdlog = mi->log;
 122   /* Route target output through the MI. */
 123   gdb_stdtarg = mi->targ;
 124   /* Route target error through the MI as well. */
 125   gdb_stdtargerr = mi->targ;
 126
 127   /* Replace all the hooks that we know about.  There really needs to
 128      be a better way of doing this... */
 129   clear_interpreter_hooks ();
 130
 131   deprecated_show_load_progress = mi_load_progress;
 132
 133   /* If we're _the_ interpreter, take control. */
 134   if (current_interp_named_p (INTERP_MI1))
 135     deprecated_command_loop_hook = mi1_command_loop;
 136   else if (current_interp_named_p (INTERP_MI2))
 137     deprecated_command_loop_hook = mi2_command_loop;
 138   else if (current_interp_named_p (INTERP_MI3))
 139     deprecated_command_loop_hook = mi3_command_loop;
 140   else
 141     deprecated_command_loop_hook = mi2_command_loop;
 142
 143   return 1;
 144 }
 145
 146 static int
 147 mi_interpreter_suspend (void *data)
 148 {
 149   gdb_disable_readline ();
 150   return 1;
 151 }
 152
 153 static struct gdb_exception
 154 mi_interpreter_exec (void *data, const char *command)
 155 {
 156   static struct gdb_exception ok;
 157   char *tmp = alloca (strlen (command) + 1);
 158   strcpy (tmp, command);
 159   mi_execute_command_wrapper (tmp);
 160   return exception_none;
 161 }
 162
 163 /* Never display the default gdb prompt in mi case.  */
 164 static int
 165 mi_interpreter_prompt_p (void *data)
 166 {
 167   return 0;
 168 }
 169
 170 static void
 171 mi_interpreter_exec_continuation (struct continuation_arg *arg, int error_p)
 172 {
 173   bpstat_do_actions (&stop_bpstat);
 174   /* It's not clear what to do in the case of errror -- should we assume that
 175      the target is stopped, or that it still runs?  */
 176   if (!target_executing)
 177     {
 178       fputs_unfiltered ("*stopped", raw_stdout);
 179       mi_out_put (uiout, raw_stdout);
 180       fputs_unfiltered ("\n", raw_stdout);
 181       fputs_unfiltered ("(gdb) \n", raw_stdout);
 182       gdb_flush (raw_stdout);
 183     }
 184   else if (target_can_async_p ())
 185     {
 186       add_continuation (mi_interpreter_exec_continuation, NULL);
 187     }
 188 }
 189
 190 enum mi_cmd_result
 191 mi_cmd_interpreter_exec (char *command, char **argv, int argc)
 192 {
 193   struct interp *interp_to_use;
 194   int i;
 195   struct interp_procs *procs;
 196   char *mi_error_message = NULL;
 197   struct cleanup *old_chain;
 198
 199   if (argc < 2)
 200     error ("mi_cmd_interpreter_exec: Usage: -interpreter-exec interp command");
 201
 202   interp_to_use = interp_lookup (argv[0]);
 203   if (interp_to_use == NULL)
 204     error ("mi_cmd_interpreter_exec: could not find interpreter \"%s\"", argv[0]);
 205
 206   if (!interp_exec_p (interp_to_use))
 207     error ("mi_cmd_interpreter_exec: interpreter \"%s\" does not support command execution",
 208               argv[0]);
 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   old_chain = make_cleanup (null_cleanup, 0);
 219   for (i = 1; i < argc; i++)
 220     {
 221       struct gdb_exception e = interp_exec (interp_to_use, argv[i]);
 222       if (e.reason < 0)
 223         {
 224           mi_error_message = xstrdup (e.message);
 225           make_cleanup (xfree, mi_error_message);
 226           break;
 227         }
 228     }
 229
 230   mi_remove_notify_hooks ();
 231
 232   /* Okay, now let's see if the command set the inferior going...
 233      Tricky point - have to do this AFTER resetting the interpreter, since
 234      changing the interpreter will clear out all the continuations for
 235      that interpreter... */
 236
 237   if (target_can_async_p () && target_executing)
 238     {
 239       fputs_unfiltered ("^running\n", raw_stdout);
 240       add_continuation (mi_interpreter_exec_continuation, NULL);
 241     }
 242
 243   if (mi_error_message != NULL)
 244     error ("%s", mi_error_message);
 245   do_cleanups (old_chain);
 246   return MI_CMD_DONE;
 247 }
 248
 249 /*
 250  * mi_insert_notify_hooks - This inserts a number of hooks that are meant to produce
 251  * async-notify ("=") MI messages while running commands in another interpreter
 252  * using mi_interpreter_exec.  The canonical use for this is to allow access to
 253  * the gdb CLI interpreter from within the MI, while still producing MI style output
 254  * when actions in the CLI command change gdb's state.
 255 */
 256
 257 static void
 258 mi_insert_notify_hooks (void)
 259 {
 260   deprecated_query_hook = mi_interp_query_hook;
 261 }
 262
 263 static void
 264 mi_remove_notify_hooks (void)
 265 {
 266   deprecated_query_hook = NULL;
 267 }
 268
 269 static int
 270 mi_interp_query_hook (const char *ctlstr, va_list ap)
 271 {
 272   return 1;
 273 }
 274
 275 static void
 276 mi_execute_command_wrapper (char *cmd)
 277 {
 278   mi_execute_command (cmd, stdin == instream);
 279 }
 280
 281 static void
 282 mi1_command_loop (void)
 283 {
 284   mi_command_loop (1);
 285 }
 286
 287 static void
 288 mi2_command_loop (void)
 289 {
 290   mi_command_loop (2);
 291 }
 292
 293 static void
 294 mi3_command_loop (void)
 295 {
 296   mi_command_loop (3);
 297 }
 298
 299 static void
 300 mi_command_loop (int mi_version)
 301 {
 302   /* Turn off 8 bit strings in quoted output.  Any character with the
 303      high bit set is printed using C's octal format. */
 304   sevenbit_strings = 1;
 305   /* Tell the world that we're alive */
 306   fputs_unfiltered ("(gdb) \n", raw_stdout);
 307   gdb_flush (raw_stdout);
 308   start_event_loop ();
 309 }
 310
 311 static void
 312 mi_new_thread (struct thread_info *t)
 313 {
 314   struct mi_interp *mi = top_level_interpreter_data ();
 315
 316   fprintf_unfiltered (mi->event_channel, "thread-created,id=\"%d\"", t->num);
 317   gdb_flush (mi->event_channel);
 318 }
 319
 320 extern initialize_file_ftype _initialize_mi_interp; /* -Wmissing-prototypes */
 321
 322 void
 323 _initialize_mi_interp (void)
 324 {
 325   static const struct interp_procs procs =
 326   {
 327     mi_interpreter_init,        /* init_proc */
 328     mi_interpreter_resume,      /* resume_proc */
 329     mi_interpreter_suspend,     /* suspend_proc */
 330     mi_interpreter_exec,        /* exec_proc */
 331     mi_interpreter_prompt_p     /* prompt_proc_p */
 332   };
 333
 334   /* The various interpreter levels.  */
 335   interp_add (interp_new (INTERP_MI1, NULL, mi_out_new (1), &procs));
 336   interp_add (interp_new (INTERP_MI2, NULL, mi_out_new (2), &procs));
 337   interp_add (interp_new (INTERP_MI3, NULL, mi_out_new (3), &procs));
 338
 339   /* "mi" selects the most recent released version.  "mi2" was
 340      released as part of GDB 6.0.  */
 341   interp_add (interp_new (INTERP_MI, NULL, mi_out_new (2), &procs));
 342 }