gdb/mi/mi-cmd-break.c

   1 /* MI Command Set - breakpoint and watchpoint commands.
   2    Copyright (C) 2000-2002, 2007-2012 Free Software Foundation, Inc.
   3    Contributed by Cygnus Solutions (a Red Hat company).
   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 "arch-utils.h"
  22 #include "mi-cmds.h"
  23 #include "ui-out.h"
  24 #include "mi-out.h"
  25 #include "breakpoint.h"
  26 #include "gdb_string.h"
  27 #include "mi-getopt.h"
  28 #include "gdb.h"
  29 #include "exceptions.h"
  30 #include "observer.h"
  31 #include "mi-main.h"
  32
  33 enum
  34   {
  35     FROM_TTY = 0
  36   };
  37
  38 /* True if MI breakpoint observers have been registered.  */
  39
  40 static int mi_breakpoint_observers_installed;
  41
  42 /* Control whether breakpoint_notify may act.  */
  43
  44 static int mi_can_breakpoint_notify;
  45
  46 /* Output a single breakpoint, when allowed.  */
  47
  48 static void
  49 breakpoint_notify (struct breakpoint *b)
  50 {
  51   if (mi_can_breakpoint_notify)
  52     gdb_breakpoint_query (current_uiout, b->number, NULL);
  53 }
  54
  55 enum bp_type
  56   {
  57     REG_BP,
  58     HW_BP,
  59     REGEXP_BP
  60   };
  61
  62 /* Implements the -break-insert command.
  63    See the MI manual for the list of possible options.  */
  64
  65 void
  66 mi_cmd_break_insert (char *command, char **argv, int argc)
  67 {
  68   char *address = NULL;
  69   int hardware = 0;
  70   int temp_p = 0;
  71   int thread = -1;
  72   int ignore_count = 0;
  73   char *condition = NULL;
  74   int pending = 0;
  75   int enabled = 1;
  76   int tracepoint = 0;
  77   struct cleanup *back_to;
  78   enum bptype type_wanted;
  79
  80   enum opt
  81     {
  82       HARDWARE_OPT, TEMP_OPT, CONDITION_OPT,
  83       IGNORE_COUNT_OPT, THREAD_OPT, PENDING_OPT, DISABLE_OPT,
  84       TRACEPOINT_OPT,
  85     };
  86   static const struct mi_opt opts[] =
  87   {
  88     {"h", HARDWARE_OPT, 0},
  89     {"t", TEMP_OPT, 0},
  90     {"c", CONDITION_OPT, 1},
  91     {"i", IGNORE_COUNT_OPT, 1},
  92     {"p", THREAD_OPT, 1},
  93     {"f", PENDING_OPT, 0},
  94     {"d", DISABLE_OPT, 0},
  95     {"a", TRACEPOINT_OPT, 0},
  96     { 0, 0, 0 }
  97   };
  98
  99   /* Parse arguments. It could be -r or -h or -t, <location> or ``--''
 100      to denote the end of the option list. */
 101   int oind = 0;
 102   char *oarg;
 103
 104   while (1)
 105     {
 106       int opt = mi_getopt ("-break-insert", argc, argv,
 107                            opts, &oind, &oarg);
 108       if (opt < 0)
 109         break;
 110       switch ((enum opt) opt)
 111         {
 112         case TEMP_OPT:
 113           temp_p = 1;
 114           break;
 115         case HARDWARE_OPT:
 116           hardware = 1;
 117           break;
 118         case CONDITION_OPT:
 119           condition = oarg;
 120           break;
 121         case IGNORE_COUNT_OPT:
 122           ignore_count = atol (oarg);
 123           break;
 124         case THREAD_OPT:
 125           thread = atol (oarg);
 126           break;
 127         case PENDING_OPT:
 128           pending = 1;
 129           break;
 130         case DISABLE_OPT:
 131           enabled = 0;
 132           break;
 133         case TRACEPOINT_OPT:
 134           tracepoint = 1;
 135           break;
 136         }
 137     }
 138
 139   if (oind >= argc)
 140     error (_("-break-insert: Missing <location>"));
 141   if (oind < argc - 1)
 142     error (_("-break-insert: Garbage following <location>"));
 143   address = argv[oind];
 144
 145   /* Now we have what we need, let's insert the breakpoint!  */
 146   if (! mi_breakpoint_observers_installed)
 147     {
 148       observer_attach_breakpoint_created (breakpoint_notify);
 149       mi_breakpoint_observers_installed = 1;
 150     }
 151
 152   back_to = make_cleanup_restore_integer (&mi_can_breakpoint_notify);
 153   mi_can_breakpoint_notify = 1;
 154
 155   /* Note that to request a fast tracepoint, the client uses the
 156      "hardware" flag, although there's nothing of hardware related to
 157      fast tracepoints -- one can implement slow tracepoints with
 158      hardware breakpoints, but fast tracepoints are always software.
 159      "fast" is a misnomer, actually, "jump" would be more appropriate.
 160      A simulator or an emulator could conceivably implement fast
 161      regular non-jump based tracepoints.  */
 162   type_wanted = (tracepoint
 163                  ? (hardware ? bp_fast_tracepoint : bp_tracepoint)
 164                  : (hardware ? bp_hardware_breakpoint : bp_breakpoint));
 165
 166   create_breakpoint (get_current_arch (), address, condition, thread,
 167                      NULL,
 168                      0 /* condition and thread are valid.  */,
 169                      temp_p, type_wanted,
 170                      ignore_count,
 171                      pending ? AUTO_BOOLEAN_TRUE : AUTO_BOOLEAN_FALSE,
 172                      &bkpt_breakpoint_ops, 0, enabled, 0, 0);
 173   do_cleanups (back_to);
 174
 175 }
 176
 177 enum wp_type
 178 {
 179   REG_WP,
 180   READ_WP,
 181   ACCESS_WP
 182 };
 183
 184 void
 185 mi_cmd_break_passcount (char *command, char **argv, int argc)
 186 {
 187   int n;
 188   int p;
 189   struct tracepoint *t;
 190
 191   if (argc != 2)
 192     error (_("Usage: tracepoint-number passcount"));
 193
 194   n = atoi (argv[0]);
 195   p = atoi (argv[1]);
 196   t = get_tracepoint (n);
 197
 198   if (t)
 199     {
 200       t->pass_count = p;
 201       observer_notify_tracepoint_modified (n);
 202     }
 203   else
 204     {
 205       error (_("Could not find tracepoint %d"), n);
 206     }
 207 }
 208
 209 /* Insert a watchpoint. The type of watchpoint is specified by the
 210    first argument:
 211    -break-watch <expr> --> insert a regular wp.
 212    -break-watch -r <expr> --> insert a read watchpoint.
 213    -break-watch -a <expr> --> insert an access wp.  */
 214
 215 void
 216 mi_cmd_break_watch (char *command, char **argv, int argc)
 217 {
 218   char *expr = NULL;
 219   enum wp_type type = REG_WP;
 220   enum opt
 221     {
 222       READ_OPT, ACCESS_OPT
 223     };
 224   static const struct mi_opt opts[] =
 225   {
 226     {"r", READ_OPT, 0},
 227     {"a", ACCESS_OPT, 0},
 228     { 0, 0, 0 }
 229   };
 230
 231   /* Parse arguments. */
 232   int oind = 0;
 233   char *oarg;
 234
 235   while (1)
 236     {
 237       int opt = mi_getopt ("-break-watch", argc, argv,
 238                            opts, &oind, &oarg);
 239
 240       if (opt < 0)
 241         break;
 242       switch ((enum opt) opt)
 243         {
 244         case READ_OPT:
 245           type = READ_WP;
 246           break;
 247         case ACCESS_OPT:
 248           type = ACCESS_WP;
 249           break;
 250         }
 251     }
 252   if (oind >= argc)
 253     error (_("-break-watch: Missing <expression>"));
 254   if (oind < argc - 1)
 255     error (_("-break-watch: Garbage following <expression>"));
 256   expr = argv[oind];
 257
 258   /* Now we have what we need, let's insert the watchpoint!  */
 259   switch (type)
 260     {
 261     case REG_WP:
 262       watch_command_wrapper (expr, FROM_TTY, 0);
 263       break;
 264     case READ_WP:
 265       rwatch_command_wrapper (expr, FROM_TTY, 0);
 266       break;
 267     case ACCESS_WP:
 268       awatch_command_wrapper (expr, FROM_TTY, 0);
 269       break;
 270     default:
 271       error (_("-break-watch: Unknown watchpoint type."));
 272     }
 273 }
 274
 275 /* The mi_read_next_line consults these variable to return successive
 276    command lines.  While it would be clearer to use a closure pointer,
 277    it is not expected that any future code will use read_command_lines_1,
 278    therefore no point of overengineering.  */
 279
 280 static char **mi_command_line_array;
 281 static int mi_command_line_array_cnt;
 282 static int mi_command_line_array_ptr;
 283
 284 static char *
 285 mi_read_next_line (void)
 286 {
 287   if (mi_command_line_array_ptr == mi_command_line_array_cnt)
 288     return NULL;
 289   else
 290     return mi_command_line_array[mi_command_line_array_ptr++];
 291 }
 292
 293 void
 294 mi_cmd_break_commands (char *command, char **argv, int argc)
 295 {
 296   struct command_line *break_command;
 297   char *endptr;
 298   int bnum;
 299   struct breakpoint *b;
 300
 301   if (argc < 1)
 302     error (_("USAGE: %s <BKPT> [<COMMAND> [<COMMAND>...]]"), command);
 303
 304   bnum = strtol (argv[0], &endptr, 0);
 305   if (endptr == argv[0])
 306     error (_("breakpoint number argument \"%s\" is not a number."),
 307            argv[0]);
 308   else if (*endptr != '\0')
 309     error (_("junk at the end of breakpoint number argument \"%s\"."),
 310            argv[0]);
 311
 312   b = get_breakpoint (bnum);
 313   if (b == NULL)
 314     error (_("breakpoint %d not found."), bnum);
 315
 316   mi_command_line_array = argv;
 317   mi_command_line_array_ptr = 1;
 318   mi_command_line_array_cnt = argc;
 319
 320   if (is_tracepoint (b))
 321     break_command = read_command_lines_1 (mi_read_next_line, 1,
 322                                           check_tracepoint_command, b);
 323   else
 324     break_command = read_command_lines_1 (mi_read_next_line, 1, 0, 0);
 325
 326   breakpoint_set_commands (b, break_command);
 327 }
 328