gdb/mi/mi-cmd-break.c

   1 /* MI Command Set - breakpoint and watchpoint commands.
   2    Copyright (C) 2000-2021 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 "mi-getopt.h"
  27 #include "observable.h"
  28 #include "mi-main.h"
  29 #include "mi-cmd-break.h"
  30 #include "language.h"
  31 #include "location.h"
  32 #include "linespec.h"
  33 #include "gdb_obstack.h"
  34 #include <ctype.h>
  35 #include "tracepoint.h"
  36
  37 enum
  38   {
  39     FROM_TTY = 0
  40   };
  41
  42 /* True if MI breakpoint observers have been registered.  */
  43
  44 static int mi_breakpoint_observers_installed;
  45
  46 /* Control whether breakpoint_notify may act.  */
  47
  48 static int mi_can_breakpoint_notify;
  49
  50 /* Output a single breakpoint, when allowed.  */
  51
  52 static void
  53 breakpoint_notify (struct breakpoint *b)
  54 {
  55   if (mi_can_breakpoint_notify)
  56     {
  57       try
  58         {
  59           print_breakpoint (b);
  60         }
  61       catch (const gdb_exception &ex)
  62         {
  63           exception_print (gdb_stderr, ex);
  64         }
  65     }
  66 }
  67
  68 enum bp_type
  69   {
  70     REG_BP,
  71     HW_BP,
  72     REGEXP_BP
  73   };
  74
  75 /* Arrange for all new breakpoints and catchpoints to be reported to
  76    CURRENT_UIOUT until the destructor of the returned scoped_restore
  77    is run.
  78
  79    Note that MI output will be probably invalid if more than one
  80    breakpoint is created inside one MI command.  */
  81
  82 scoped_restore_tmpl<int>
  83 setup_breakpoint_reporting (void)
  84 {
  85   if (! mi_breakpoint_observers_installed)
  86     {
  87       gdb::observers::breakpoint_created.attach (breakpoint_notify,
  88                                                  "mi-cmd-break");
  89       mi_breakpoint_observers_installed = 1;
  90     }
  91
  92   return make_scoped_restore (&mi_can_breakpoint_notify, 1);
  93 }
  94
  95
  96 /* Convert arguments in ARGV to the string in "format",argv,argv...
  97    and return it.  */
  98
  99 static std::string
 100 mi_argv_to_format (char **argv, int argc)
 101 {
 102   int i;
 103   std::string result;
 104
 105   /* Convert ARGV[OIND + 1] to format string and save to FORMAT.  */
 106   result += '\"';
 107   for (i = 0; i < strlen (argv[0]); i++)
 108     {
 109       switch (argv[0][i])
 110         {
 111         case '\\':
 112           result += "\\\\";
 113           break;
 114         case '\a':
 115           result += "\\a";
 116           break;
 117         case '\b':
 118           result += "\\b";
 119           break;
 120         case '\f':
 121           result += "\\f";
 122           break;
 123         case '\n':
 124           result += "\\n";
 125           break;
 126         case '\r':
 127           result += "\\r";
 128           break;
 129         case '\t':
 130           result += "\\t";
 131           break;
 132         case '\v':
 133           result += "\\v";
 134           break;
 135         case '"':
 136           result += "\\\"";
 137           break;
 138         default:
 139           if (isprint (argv[0][i]))
 140             result += argv[0][i];
 141           else
 142             {
 143               char tmp[5];
 144
 145               xsnprintf (tmp, sizeof (tmp), "\\%o",
 146                          (unsigned char) argv[0][i]);
 147               result += tmp;
 148             }
 149           break;
 150         }
 151     }
 152   result += '\"';
 153
 154   /* Apply other argv to FORMAT.  */
 155   for (i = 1; i < argc; i++)
 156     {
 157       result += ',';
 158       result += argv[i];
 159     }
 160
 161   return result;
 162 }
 163
 164 /* Insert breakpoint.
 165    If dprintf is true, it will insert dprintf.
 166    If not, it will insert other type breakpoint.  */
 167
 168 static void
 169 mi_cmd_break_insert_1 (int dprintf, const char *command, char **argv, int argc)
 170 {
 171   const char *address = NULL;
 172   int hardware = 0;
 173   int temp_p = 0;
 174   int thread = -1;
 175   int ignore_count = 0;
 176   char *condition = NULL;
 177   int pending = 0;
 178   int enabled = 1;
 179   int tracepoint = 0;
 180   symbol_name_match_type match_type = symbol_name_match_type::WILD;
 181   enum bptype type_wanted;
 182   event_location_up location;
 183   struct breakpoint_ops *ops;
 184   int is_explicit = 0;
 185   struct explicit_location explicit_loc;
 186   std::string extra_string;
 187   bool force_condition = false;
 188
 189   enum opt
 190     {
 191       HARDWARE_OPT, TEMP_OPT, CONDITION_OPT,
 192       IGNORE_COUNT_OPT, THREAD_OPT, PENDING_OPT, DISABLE_OPT,
 193       TRACEPOINT_OPT,
 194       FORCE_CONDITION_OPT,
 195       QUALIFIED_OPT,
 196       EXPLICIT_SOURCE_OPT, EXPLICIT_FUNC_OPT,
 197       EXPLICIT_LABEL_OPT, EXPLICIT_LINE_OPT
 198     };
 199   static const struct mi_opt opts[] =
 200   {
 201     {"h", HARDWARE_OPT, 0},
 202     {"t", TEMP_OPT, 0},
 203     {"c", CONDITION_OPT, 1},
 204     {"i", IGNORE_COUNT_OPT, 1},
 205     {"p", THREAD_OPT, 1},
 206     {"f", PENDING_OPT, 0},
 207     {"d", DISABLE_OPT, 0},
 208     {"a", TRACEPOINT_OPT, 0},
 209     {"-force-condition", FORCE_CONDITION_OPT, 0},
 210     {"-qualified", QUALIFIED_OPT, 0},
 211     {"-source" , EXPLICIT_SOURCE_OPT, 1},
 212     {"-function", EXPLICIT_FUNC_OPT, 1},
 213     {"-label", EXPLICIT_LABEL_OPT, 1},
 214     {"-line", EXPLICIT_LINE_OPT, 1},
 215     { 0, 0, 0 }
 216   };
 217
 218   /* Parse arguments. It could be -r or -h or -t, <location> or ``--''
 219      to denote the end of the option list. */
 220   int oind = 0;
 221   char *oarg;
 222
 223   initialize_explicit_location (&explicit_loc);
 224
 225   while (1)
 226     {
 227       int opt = mi_getopt ("-break-insert", argc, argv,
 228                            opts, &oind, &oarg);
 229       if (opt < 0)
 230         break;
 231       switch ((enum opt) opt)
 232         {
 233         case TEMP_OPT:
 234           temp_p = 1;
 235           break;
 236         case HARDWARE_OPT:
 237           hardware = 1;
 238           break;
 239         case CONDITION_OPT:
 240           condition = oarg;
 241           break;
 242         case IGNORE_COUNT_OPT:
 243           ignore_count = atol (oarg);
 244           break;
 245         case THREAD_OPT:
 246           thread = atol (oarg);
 247           break;
 248         case PENDING_OPT:
 249           pending = 1;
 250           break;
 251         case DISABLE_OPT:
 252           enabled = 0;
 253           break;
 254         case TRACEPOINT_OPT:
 255           tracepoint = 1;
 256           break;
 257         case QUALIFIED_OPT:
 258           match_type = symbol_name_match_type::FULL;
 259           break;
 260         case EXPLICIT_SOURCE_OPT:
 261           is_explicit = 1;
 262           explicit_loc.source_filename = oarg;
 263           break;
 264         case EXPLICIT_FUNC_OPT:
 265           is_explicit = 1;
 266           explicit_loc.function_name = oarg;
 267           break;
 268         case EXPLICIT_LABEL_OPT:
 269           is_explicit = 1;
 270           explicit_loc.label_name = oarg;
 271           break;
 272         case EXPLICIT_LINE_OPT:
 273           is_explicit = 1;
 274           explicit_loc.line_offset = linespec_parse_line_offset (oarg);
 275           break;
 276         case FORCE_CONDITION_OPT:
 277           force_condition = true;
 278           break;
 279         }
 280     }
 281
 282   if (oind >= argc && !is_explicit)
 283     error (_("-%s-insert: Missing <location>"),
 284            dprintf ? "dprintf" : "break");
 285   if (dprintf)
 286     {
 287       int format_num = is_explicit ? oind : oind + 1;
 288
 289       if (hardware || tracepoint)
 290         error (_("-dprintf-insert: does not support -h or -a"));
 291       if (format_num >= argc)
 292         error (_("-dprintf-insert: Missing <format>"));
 293
 294       extra_string = mi_argv_to_format (argv + format_num, argc - format_num);
 295       address = argv[oind];
 296     }
 297   else
 298     {
 299       if (is_explicit)
 300         {
 301           if (oind < argc)
 302             error (_("-break-insert: Garbage following explicit location"));
 303         }
 304       else
 305         {
 306           if (oind < argc - 1)
 307             error (_("-break-insert: Garbage following <location>"));
 308           address = argv[oind];
 309         }
 310     }
 311
 312   /* Now we have what we need, let's insert the breakpoint!  */
 313   scoped_restore restore_breakpoint_reporting = setup_breakpoint_reporting ();
 314
 315   if (tracepoint)
 316     {
 317       /* Note that to request a fast tracepoint, the client uses the
 318          "hardware" flag, although there's nothing of hardware related to
 319          fast tracepoints -- one can implement slow tracepoints with
 320          hardware breakpoints, but fast tracepoints are always software.
 321          "fast" is a misnomer, actually, "jump" would be more appropriate.
 322          A simulator or an emulator could conceivably implement fast
 323          regular non-jump based tracepoints.  */
 324       type_wanted = hardware ? bp_fast_tracepoint : bp_tracepoint;
 325       ops = &tracepoint_breakpoint_ops;
 326     }
 327   else if (dprintf)
 328     {
 329       type_wanted = bp_dprintf;
 330       ops = &dprintf_breakpoint_ops;
 331     }
 332   else
 333     {
 334       type_wanted = hardware ? bp_hardware_breakpoint : bp_breakpoint;
 335       ops = &bkpt_breakpoint_ops;
 336     }
 337
 338   if (is_explicit)
 339     {
 340       /* Error check -- we must have one of the other
 341          parameters specified.  */
 342       if (explicit_loc.source_filename != NULL
 343           && explicit_loc.function_name == NULL
 344           && explicit_loc.label_name == NULL
 345           && explicit_loc.line_offset.sign == LINE_OFFSET_UNKNOWN)
 346         error (_("-%s-insert: --source option requires --function, --label,"
 347                  " or --line"), dprintf ? "dprintf" : "break");
 348
 349       explicit_loc.func_name_match_type = match_type;
 350
 351       location = new_explicit_location (&explicit_loc);
 352     }
 353   else
 354     {
 355       location = string_to_event_location_basic (&address, current_language,
 356                                                  match_type);
 357       if (*address)
 358         error (_("Garbage '%s' at end of location"), address);
 359     }
 360
 361   create_breakpoint (get_current_arch (), location.get (), condition, thread,
 362                      extra_string.c_str (),
 363                      force_condition,
 364                      0 /* condition and thread are valid.  */,
 365                      temp_p, type_wanted,
 366                      ignore_count,
 367                      pending ? AUTO_BOOLEAN_TRUE : AUTO_BOOLEAN_FALSE,
 368                      ops, 0, enabled, 0, 0);
 369 }
 370
 371 /* Implements the -break-insert command.
 372    See the MI manual for the list of possible options.  */
 373
 374 void
 375 mi_cmd_break_insert (const char *command, char **argv, int argc)
 376 {
 377   mi_cmd_break_insert_1 (0, command, argv, argc);
 378 }
 379
 380 /* Implements the -dprintf-insert command.
 381    See the MI manual for the list of possible options.  */
 382
 383 void
 384 mi_cmd_dprintf_insert (const char *command, char **argv, int argc)
 385 {
 386   mi_cmd_break_insert_1 (1, command, argv, argc);
 387 }
 388
 389 /* Implements the -break-condition command.
 390    See the MI manual for the list of options.  */
 391
 392 void
 393 mi_cmd_break_condition (const char *command, char **argv, int argc)
 394 {
 395   enum option
 396     {
 397       FORCE_CONDITION_OPT,
 398     };
 399
 400   static const struct mi_opt opts[] =
 401   {
 402     {"-force", FORCE_CONDITION_OPT, 0},
 403     { 0, 0, 0 }
 404   };
 405
 406   /* Parse arguments.  */
 407   int oind = 0;
 408   char *oarg;
 409   bool force_condition = false;
 410
 411   while (true)
 412     {
 413       int opt = mi_getopt ("-break-condition", argc, argv,
 414                            opts, &oind, &oarg);
 415       if (opt < 0)
 416         break;
 417
 418       switch (opt)
 419         {
 420         case FORCE_CONDITION_OPT:
 421           force_condition = true;
 422           break;
 423         }
 424     }
 425
 426   /* There must be at least one more arg: a bpnum.  */
 427   if (oind >= argc)
 428     error (_("-break-condition: Missing the <number> argument"));
 429
 430   int bpnum = atoi (argv[oind]);
 431
 432   /* The rest form the condition expr.  */
 433   std::string expr = "";
 434   for (int i = oind + 1; i < argc; ++i)
 435     {
 436       expr += argv[i];
 437       if (i + 1 < argc)
 438         expr += " ";
 439     }
 440
 441   set_breakpoint_condition (bpnum, expr.c_str (), 0 /* from_tty */,
 442                             force_condition);
 443 }
 444
 445 enum wp_type
 446 {
 447   REG_WP,
 448   READ_WP,
 449   ACCESS_WP
 450 };
 451
 452 void
 453 mi_cmd_break_passcount (const char *command, char **argv, int argc)
 454 {
 455   int n;
 456   int p;
 457   struct tracepoint *t;
 458
 459   if (argc != 2)
 460     error (_("Usage: tracepoint-number passcount"));
 461
 462   n = atoi (argv[0]);
 463   p = atoi (argv[1]);
 464   t = get_tracepoint (n);
 465
 466   if (t)
 467     {
 468       t->pass_count = p;
 469       gdb::observers::breakpoint_modified.notify (t);
 470     }
 471   else
 472     {
 473       error (_("Could not find tracepoint %d"), n);
 474     }
 475 }
 476
 477 /* Insert a watchpoint. The type of watchpoint is specified by the
 478    first argument:
 479    -break-watch <expr> --> insert a regular wp.
 480    -break-watch -r <expr> --> insert a read watchpoint.
 481    -break-watch -a <expr> --> insert an access wp.  */
 482
 483 void
 484 mi_cmd_break_watch (const char *command, char **argv, int argc)
 485 {
 486   char *expr = NULL;
 487   enum wp_type type = REG_WP;
 488   enum opt
 489     {
 490       READ_OPT, ACCESS_OPT
 491     };
 492   static const struct mi_opt opts[] =
 493   {
 494     {"r", READ_OPT, 0},
 495     {"a", ACCESS_OPT, 0},
 496     { 0, 0, 0 }
 497   };
 498
 499   /* Parse arguments. */
 500   int oind = 0;
 501   char *oarg;
 502
 503   while (1)
 504     {
 505       int opt = mi_getopt ("-break-watch", argc, argv,
 506                            opts, &oind, &oarg);
 507
 508       if (opt < 0)
 509         break;
 510       switch ((enum opt) opt)
 511         {
 512         case READ_OPT:
 513           type = READ_WP;
 514           break;
 515         case ACCESS_OPT:
 516           type = ACCESS_WP;
 517           break;
 518         }
 519     }
 520   if (oind >= argc)
 521     error (_("-break-watch: Missing <expression>"));
 522   if (oind < argc - 1)
 523     error (_("-break-watch: Garbage following <expression>"));
 524   expr = argv[oind];
 525
 526   /* Now we have what we need, let's insert the watchpoint!  */
 527   switch (type)
 528     {
 529     case REG_WP:
 530       watch_command_wrapper (expr, FROM_TTY, false);
 531       break;
 532     case READ_WP:
 533       rwatch_command_wrapper (expr, FROM_TTY, false);
 534       break;
 535     case ACCESS_WP:
 536       awatch_command_wrapper (expr, FROM_TTY, false);
 537       break;
 538     default:
 539       error (_("-break-watch: Unknown watchpoint type."));
 540     }
 541 }
 542
 543 void
 544 mi_cmd_break_commands (const char *command, char **argv, int argc)
 545 {
 546   counted_command_line break_command;
 547   char *endptr;
 548   int bnum;
 549   struct breakpoint *b;
 550
 551   if (argc < 1)
 552     error (_("USAGE: %s <BKPT> [<COMMAND> [<COMMAND>...]]"), command);
 553
 554   bnum = strtol (argv[0], &endptr, 0);
 555   if (endptr == argv[0])
 556     error (_("breakpoint number argument \"%s\" is not a number."),
 557            argv[0]);
 558   else if (*endptr != '\0')
 559     error (_("junk at the end of breakpoint number argument \"%s\"."),
 560            argv[0]);
 561
 562   b = get_breakpoint (bnum);
 563   if (b == NULL)
 564     error (_("breakpoint %d not found."), bnum);
 565
 566   int count = 1;
 567   auto reader
 568     = [&] ()
 569       {
 570         const char *result = nullptr;
 571         if (count < argc)
 572           result = argv[count++];
 573         return result;
 574       };
 575
 576   if (is_tracepoint (b))
 577     break_command = read_command_lines_1 (reader, 1,
 578                                           [=] (const char *line)
 579                                             {
 580                                               validate_actionline (line, b);
 581                                             });
 582   else
 583     break_command = read_command_lines_1 (reader, 1, 0);
 584
 585   breakpoint_set_commands (b, std::move (break_command));
 586 }
 587