gdb/mi/mi-cmd-break.c

   1 /* MI Command Set - breakpoint and watchpoint commands.
   2    Copyright (C) 2000, 2001, 2002, 2007, 2008, 2009, 2010, 2011
   3    Free Software Foundation, Inc.
   4    Contributed by Cygnus Solutions (a Red Hat company).
   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 "arch-utils.h"
  23 #include "mi-cmds.h"
  24 #include "ui-out.h"
  25 #include "mi-out.h"
  26 #include "breakpoint.h"
  27 #include "gdb_string.h"
  28 #include "mi-getopt.h"
  29 #include "gdb.h"
  30 #include "exceptions.h"
  31 #include "observer.h"
  32 #include "mi-main.h"
  33
  34 enum
  35   {
  36     FROM_TTY = 0
  37   };
  38
  39 /* True if MI breakpoint observers have been registered.  */
  40
  41 static int mi_breakpoint_observers_installed;
  42
  43 /* Control whether breakpoint_notify may act.  */
  44
  45 static int mi_can_breakpoint_notify;
  46
  47 /* Output a single breakpoint, when allowed. */
  48
  49 static void
  50 breakpoint_notify (struct breakpoint *b)
  51 {
  52   if (mi_can_breakpoint_notify)
  53     gdb_breakpoint_query (current_uiout, b->number, NULL);
  54 }
  55
  56 enum bp_type
  57   {
  58     REG_BP,
  59     HW_BP,
  60     REGEXP_BP
  61   };
  62
  63 /* Implements the -break-insert command.
  64    See the MI manual for the list of possible options.  */
  65
  66 void
  67 mi_cmd_break_insert (char *command, char **argv, int argc)
  68 {
  69   char *address = NULL;
  70   int hardware = 0;
  71   int temp_p = 0;
  72   int thread = -1;
  73   int ignore_count = 0;
  74   char *condition = NULL;
  75   int pending = 0;
  76   int enabled = 1;
  77   int tracepoint = 0;
  78   struct cleanup *back_to;
  79   enum bptype type_wanted;
  80
  81   enum opt
  82     {
  83       HARDWARE_OPT, TEMP_OPT, CONDITION_OPT,
  84       IGNORE_COUNT_OPT, THREAD_OPT, PENDING_OPT, DISABLE_OPT,
  85       TRACEPOINT_OPT,
  86     };
  87   static struct mi_opt opts[] =
  88   {
  89     {"h", HARDWARE_OPT, 0},
  90     {"t", TEMP_OPT, 0},
  91     {"c", CONDITION_OPT, 1},
  92     {"i", IGNORE_COUNT_OPT, 1},
  93     {"p", THREAD_OPT, 1},
  94     {"f", PENDING_OPT, 0},
  95     {"d", DISABLE_OPT, 0},
  96     {"a", TRACEPOINT_OPT, 0},
  97     { 0, 0, 0 }
  98   };
  99
 100   /* Parse arguments. It could be -r or -h or -t, <location> or ``--''
 101      to denote the end of the option list. */
 102   int optind = 0;
 103   char *optarg;
 104
 105   while (1)
 106     {
 107       int opt = mi_getopt ("-break-insert", argc, argv,
 108                            opts, &optind, &optarg);
 109       if (opt < 0)
 110         break;
 111       switch ((enum opt) opt)
 112         {
 113         case TEMP_OPT:
 114           temp_p = 1;
 115           break;
 116         case HARDWARE_OPT:
 117           hardware = 1;
 118           break;
 119         case CONDITION_OPT:
 120           condition = optarg;
 121           break;
 122         case IGNORE_COUNT_OPT:
 123           ignore_count = atol (optarg);
 124           break;
 125         case THREAD_OPT:
 126           thread = atol (optarg);
 127           break;
 128         case PENDING_OPT:
 129           pending = 1;
 130           break;
 131         case DISABLE_OPT:
 132           enabled = 0;
 133           break;
 134         case TRACEPOINT_OPT:
 135           tracepoint = 1;
 136           break;
 137         }
 138     }
 139
 140   if (optind >= argc)
 141     error (_("-break-insert: Missing <location>"));
 142   if (optind < argc - 1)
 143     error (_("-break-insert: Garbage following <location>"));
 144   address = argv[optind];
 145
 146   /* Now we have what we need, let's insert the breakpoint! */
 147   if (! mi_breakpoint_observers_installed)
 148     {
 149       observer_attach_breakpoint_created (breakpoint_notify);
 150       mi_breakpoint_observers_installed = 1;
 151     }
 152
 153   back_to = make_cleanup_restore_integer (&mi_can_breakpoint_notify);
 154   mi_can_breakpoint_notify = 1;
 155
 156   /* Note that to request a fast tracepoint, the client uses the
 157      "hardware" flag, although there's nothing of hardware related to
 158      fast tracepoints -- one can implement slow tracepoints with
 159      hardware breakpoints, but fast tracepoints are always software.
 160      "fast" is a misnomer, actually, "jump" would be more appropriate.
 161      A simulator or an emulator could conceivably implement fast
 162      regular non-jump based tracepoints.  */
 163   type_wanted = (tracepoint
 164                  ? (hardware ? bp_fast_tracepoint : bp_tracepoint)
 165                  : (hardware ? bp_hardware_breakpoint : bp_breakpoint));
 166
 167   create_breakpoint (get_current_arch (), address, condition, thread,
 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);
 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 (_("Cound 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 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 optind = 0;
 233   char *optarg;
 234
 235   while (1)
 236     {
 237       int opt = mi_getopt ("-break-watch", argc, argv,
 238                            opts, &optind, &optarg);
 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 (optind >= argc)
 253     error (_("-break-watch: Missing <expression>"));
 254   if (optind < argc - 1)
 255     error (_("-break-watch: Garbage following <expression>"));
 256   expr = argv[optind];
 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