| 1 | /* Data structures and API for event locations in GDB. |
| 2 | Copyright (C) 2013-2018 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GDB. |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 3 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #include "defs.h" |
| 20 | #include "gdb_assert.h" |
| 21 | #include "location.h" |
| 22 | #include "symtab.h" |
| 23 | #include "language.h" |
| 24 | #include "linespec.h" |
| 25 | #include "cli/cli-utils.h" |
| 26 | #include "probe.h" |
| 27 | #include "cp-support.h" |
| 28 | |
| 29 | #include <ctype.h> |
| 30 | #include <string.h> |
| 31 | |
| 32 | /* An event location used to set a stop event in the inferior. |
| 33 | This structure is an amalgam of the various ways |
| 34 | to specify where a stop event should be set. */ |
| 35 | |
| 36 | struct event_location |
| 37 | { |
| 38 | /* The type of this breakpoint specification. */ |
| 39 | enum event_location_type type; |
| 40 | #define EL_TYPE(P) (P)->type |
| 41 | |
| 42 | union |
| 43 | { |
| 44 | /* A probe. */ |
| 45 | char *addr_string; |
| 46 | #define EL_PROBE(P) ((P)->u.addr_string) |
| 47 | |
| 48 | /* A "normal" linespec. */ |
| 49 | struct linespec_location linespec_location; |
| 50 | #define EL_LINESPEC(P) (&(P)->u.linespec_location) |
| 51 | |
| 52 | /* An address in the inferior. */ |
| 53 | CORE_ADDR address; |
| 54 | #define EL_ADDRESS(P) (P)->u.address |
| 55 | |
| 56 | /* An explicit location. */ |
| 57 | struct explicit_location explicit_loc; |
| 58 | #define EL_EXPLICIT(P) (&((P)->u.explicit_loc)) |
| 59 | } u; |
| 60 | |
| 61 | /* Cached string representation of this location. This is used, e.g., to |
| 62 | save stop event locations to file. Malloc'd. */ |
| 63 | char *as_string; |
| 64 | #define EL_STRING(P) ((P)->as_string) |
| 65 | }; |
| 66 | |
| 67 | /* See description in location.h. */ |
| 68 | |
| 69 | enum event_location_type |
| 70 | event_location_type (const struct event_location *location) |
| 71 | { |
| 72 | return EL_TYPE (location); |
| 73 | } |
| 74 | |
| 75 | /* See description in location.h. */ |
| 76 | |
| 77 | void |
| 78 | initialize_explicit_location (struct explicit_location *explicit_loc) |
| 79 | { |
| 80 | memset (explicit_loc, 0, sizeof (struct explicit_location)); |
| 81 | explicit_loc->line_offset.sign = LINE_OFFSET_UNKNOWN; |
| 82 | explicit_loc->func_name_match_type = symbol_name_match_type::WILD; |
| 83 | } |
| 84 | |
| 85 | /* See description in location.h. */ |
| 86 | |
| 87 | event_location_up |
| 88 | new_linespec_location (const char **linespec, |
| 89 | symbol_name_match_type match_type) |
| 90 | { |
| 91 | struct event_location *location; |
| 92 | |
| 93 | location = XCNEW (struct event_location); |
| 94 | EL_TYPE (location) = LINESPEC_LOCATION; |
| 95 | EL_LINESPEC (location)->match_type = match_type; |
| 96 | if (*linespec != NULL) |
| 97 | { |
| 98 | const char *p; |
| 99 | const char *orig = *linespec; |
| 100 | |
| 101 | linespec_lex_to_end (linespec); |
| 102 | p = remove_trailing_whitespace (orig, *linespec); |
| 103 | if ((p - orig) > 0) |
| 104 | EL_LINESPEC (location)->spec_string = savestring (orig, p - orig); |
| 105 | } |
| 106 | return event_location_up (location); |
| 107 | } |
| 108 | |
| 109 | /* See description in location.h. */ |
| 110 | |
| 111 | const linespec_location * |
| 112 | get_linespec_location (const struct event_location *location) |
| 113 | { |
| 114 | gdb_assert (EL_TYPE (location) == LINESPEC_LOCATION); |
| 115 | return EL_LINESPEC (location); |
| 116 | } |
| 117 | |
| 118 | /* See description in location.h. */ |
| 119 | |
| 120 | event_location_up |
| 121 | new_address_location (CORE_ADDR addr, const char *addr_string, |
| 122 | int addr_string_len) |
| 123 | { |
| 124 | struct event_location *location; |
| 125 | |
| 126 | location = XCNEW (struct event_location); |
| 127 | EL_TYPE (location) = ADDRESS_LOCATION; |
| 128 | EL_ADDRESS (location) = addr; |
| 129 | if (addr_string != NULL) |
| 130 | EL_STRING (location) = xstrndup (addr_string, addr_string_len); |
| 131 | return event_location_up (location); |
| 132 | } |
| 133 | |
| 134 | /* See description in location.h. */ |
| 135 | |
| 136 | CORE_ADDR |
| 137 | get_address_location (const struct event_location *location) |
| 138 | { |
| 139 | gdb_assert (EL_TYPE (location) == ADDRESS_LOCATION); |
| 140 | return EL_ADDRESS (location); |
| 141 | } |
| 142 | |
| 143 | /* See description in location.h. */ |
| 144 | |
| 145 | const char * |
| 146 | get_address_string_location (const struct event_location *location) |
| 147 | { |
| 148 | gdb_assert (EL_TYPE (location) == ADDRESS_LOCATION); |
| 149 | return EL_STRING (location); |
| 150 | } |
| 151 | |
| 152 | /* See description in location.h. */ |
| 153 | |
| 154 | event_location_up |
| 155 | new_probe_location (const char *probe) |
| 156 | { |
| 157 | struct event_location *location; |
| 158 | |
| 159 | location = XCNEW (struct event_location); |
| 160 | EL_TYPE (location) = PROBE_LOCATION; |
| 161 | if (probe != NULL) |
| 162 | EL_PROBE (location) = xstrdup (probe); |
| 163 | return event_location_up (location); |
| 164 | } |
| 165 | |
| 166 | /* See description in location.h. */ |
| 167 | |
| 168 | const char * |
| 169 | get_probe_location (const struct event_location *location) |
| 170 | { |
| 171 | gdb_assert (EL_TYPE (location) == PROBE_LOCATION); |
| 172 | return EL_PROBE (location); |
| 173 | } |
| 174 | |
| 175 | /* See description in location.h. */ |
| 176 | |
| 177 | event_location_up |
| 178 | new_explicit_location (const struct explicit_location *explicit_loc) |
| 179 | { |
| 180 | struct event_location tmp; |
| 181 | |
| 182 | memset (&tmp, 0, sizeof (struct event_location)); |
| 183 | EL_TYPE (&tmp) = EXPLICIT_LOCATION; |
| 184 | initialize_explicit_location (EL_EXPLICIT (&tmp)); |
| 185 | if (explicit_loc != NULL) |
| 186 | { |
| 187 | EL_EXPLICIT (&tmp)->func_name_match_type |
| 188 | = explicit_loc->func_name_match_type; |
| 189 | |
| 190 | if (explicit_loc->source_filename != NULL) |
| 191 | { |
| 192 | EL_EXPLICIT (&tmp)->source_filename |
| 193 | = explicit_loc->source_filename; |
| 194 | } |
| 195 | |
| 196 | if (explicit_loc->function_name != NULL) |
| 197 | EL_EXPLICIT (&tmp)->function_name |
| 198 | = explicit_loc->function_name; |
| 199 | |
| 200 | if (explicit_loc->label_name != NULL) |
| 201 | EL_EXPLICIT (&tmp)->label_name = explicit_loc->label_name; |
| 202 | |
| 203 | if (explicit_loc->line_offset.sign != LINE_OFFSET_UNKNOWN) |
| 204 | EL_EXPLICIT (&tmp)->line_offset = explicit_loc->line_offset; |
| 205 | } |
| 206 | |
| 207 | return copy_event_location (&tmp); |
| 208 | } |
| 209 | |
| 210 | /* See description in location.h. */ |
| 211 | |
| 212 | struct explicit_location * |
| 213 | get_explicit_location (struct event_location *location) |
| 214 | { |
| 215 | gdb_assert (EL_TYPE (location) == EXPLICIT_LOCATION); |
| 216 | return EL_EXPLICIT (location); |
| 217 | } |
| 218 | |
| 219 | /* See description in location.h. */ |
| 220 | |
| 221 | const struct explicit_location * |
| 222 | get_explicit_location_const (const struct event_location *location) |
| 223 | { |
| 224 | gdb_assert (EL_TYPE (location) == EXPLICIT_LOCATION); |
| 225 | return EL_EXPLICIT (location); |
| 226 | } |
| 227 | |
| 228 | /* This convenience function returns a malloc'd string which |
| 229 | represents the location in EXPLICIT_LOC. |
| 230 | |
| 231 | AS_LINESPEC is non-zero if this string should be a linespec. |
| 232 | Otherwise it will be output in explicit form. */ |
| 233 | |
| 234 | static char * |
| 235 | explicit_to_string_internal (int as_linespec, |
| 236 | const struct explicit_location *explicit_loc) |
| 237 | { |
| 238 | int need_space = 0; |
| 239 | char space = as_linespec ? ':' : ' '; |
| 240 | string_file buf; |
| 241 | |
| 242 | if (explicit_loc->source_filename != NULL) |
| 243 | { |
| 244 | if (!as_linespec) |
| 245 | buf.puts ("-source "); |
| 246 | buf.puts (explicit_loc->source_filename); |
| 247 | need_space = 1; |
| 248 | } |
| 249 | |
| 250 | if (explicit_loc->function_name != NULL) |
| 251 | { |
| 252 | if (need_space) |
| 253 | buf.putc (space); |
| 254 | if (explicit_loc->func_name_match_type == symbol_name_match_type::FULL) |
| 255 | buf.puts ("-qualified "); |
| 256 | if (!as_linespec) |
| 257 | buf.puts ("-function "); |
| 258 | buf.puts (explicit_loc->function_name); |
| 259 | need_space = 1; |
| 260 | } |
| 261 | |
| 262 | if (explicit_loc->label_name != NULL) |
| 263 | { |
| 264 | if (need_space) |
| 265 | buf.putc (space); |
| 266 | if (!as_linespec) |
| 267 | buf.puts ("-label "); |
| 268 | buf.puts (explicit_loc->label_name); |
| 269 | need_space = 1; |
| 270 | } |
| 271 | |
| 272 | if (explicit_loc->line_offset.sign != LINE_OFFSET_UNKNOWN) |
| 273 | { |
| 274 | if (need_space) |
| 275 | buf.putc (space); |
| 276 | if (!as_linespec) |
| 277 | buf.puts ("-line "); |
| 278 | buf.printf ("%s%d", |
| 279 | (explicit_loc->line_offset.sign == LINE_OFFSET_NONE ? "" |
| 280 | : (explicit_loc->line_offset.sign |
| 281 | == LINE_OFFSET_PLUS ? "+" : "-")), |
| 282 | explicit_loc->line_offset.offset); |
| 283 | } |
| 284 | |
| 285 | return xstrdup (buf.c_str ()); |
| 286 | } |
| 287 | |
| 288 | /* See description in location.h. */ |
| 289 | |
| 290 | char * |
| 291 | explicit_location_to_string (const struct explicit_location *explicit_loc) |
| 292 | { |
| 293 | return explicit_to_string_internal (0, explicit_loc); |
| 294 | } |
| 295 | |
| 296 | /* See description in location.h. */ |
| 297 | |
| 298 | char * |
| 299 | explicit_location_to_linespec (const struct explicit_location *explicit_loc) |
| 300 | { |
| 301 | return explicit_to_string_internal (1, explicit_loc); |
| 302 | } |
| 303 | |
| 304 | /* See description in location.h. */ |
| 305 | |
| 306 | event_location_up |
| 307 | copy_event_location (const struct event_location *src) |
| 308 | { |
| 309 | struct event_location *dst; |
| 310 | |
| 311 | dst = XCNEW (struct event_location); |
| 312 | EL_TYPE (dst) = EL_TYPE (src); |
| 313 | if (EL_STRING (src) != NULL) |
| 314 | EL_STRING (dst) = xstrdup (EL_STRING (src)); |
| 315 | |
| 316 | switch (EL_TYPE (src)) |
| 317 | { |
| 318 | case LINESPEC_LOCATION: |
| 319 | EL_LINESPEC (dst)->match_type = EL_LINESPEC (src)->match_type; |
| 320 | if (EL_LINESPEC (src)->spec_string != NULL) |
| 321 | EL_LINESPEC (dst)->spec_string |
| 322 | = xstrdup (EL_LINESPEC (src)->spec_string); |
| 323 | break; |
| 324 | |
| 325 | case ADDRESS_LOCATION: |
| 326 | EL_ADDRESS (dst) = EL_ADDRESS (src); |
| 327 | break; |
| 328 | |
| 329 | case EXPLICIT_LOCATION: |
| 330 | EL_EXPLICIT (dst)->func_name_match_type |
| 331 | = EL_EXPLICIT (src)->func_name_match_type; |
| 332 | if (EL_EXPLICIT (src)->source_filename != NULL) |
| 333 | EL_EXPLICIT (dst)->source_filename |
| 334 | = xstrdup (EL_EXPLICIT (src)->source_filename); |
| 335 | |
| 336 | if (EL_EXPLICIT (src)->function_name != NULL) |
| 337 | EL_EXPLICIT (dst)->function_name |
| 338 | = xstrdup (EL_EXPLICIT (src)->function_name); |
| 339 | |
| 340 | if (EL_EXPLICIT (src)->label_name != NULL) |
| 341 | EL_EXPLICIT (dst)->label_name = xstrdup (EL_EXPLICIT (src)->label_name); |
| 342 | |
| 343 | EL_EXPLICIT (dst)->line_offset = EL_EXPLICIT (src)->line_offset; |
| 344 | break; |
| 345 | |
| 346 | |
| 347 | case PROBE_LOCATION: |
| 348 | if (EL_PROBE (src) != NULL) |
| 349 | EL_PROBE (dst) = xstrdup (EL_PROBE (src)); |
| 350 | break; |
| 351 | |
| 352 | default: |
| 353 | gdb_assert_not_reached ("unknown event location type"); |
| 354 | } |
| 355 | |
| 356 | return event_location_up (dst); |
| 357 | } |
| 358 | |
| 359 | void |
| 360 | event_location_deleter::operator() (event_location *location) const |
| 361 | { |
| 362 | if (location != NULL) |
| 363 | { |
| 364 | xfree (EL_STRING (location)); |
| 365 | |
| 366 | switch (EL_TYPE (location)) |
| 367 | { |
| 368 | case LINESPEC_LOCATION: |
| 369 | xfree (EL_LINESPEC (location)->spec_string); |
| 370 | break; |
| 371 | |
| 372 | case ADDRESS_LOCATION: |
| 373 | /* Nothing to do. */ |
| 374 | break; |
| 375 | |
| 376 | case EXPLICIT_LOCATION: |
| 377 | xfree (EL_EXPLICIT (location)->source_filename); |
| 378 | xfree (EL_EXPLICIT (location)->function_name); |
| 379 | xfree (EL_EXPLICIT (location)->label_name); |
| 380 | break; |
| 381 | |
| 382 | case PROBE_LOCATION: |
| 383 | xfree (EL_PROBE (location)); |
| 384 | break; |
| 385 | |
| 386 | default: |
| 387 | gdb_assert_not_reached ("unknown event location type"); |
| 388 | } |
| 389 | |
| 390 | xfree (location); |
| 391 | } |
| 392 | } |
| 393 | |
| 394 | /* See description in location.h. */ |
| 395 | |
| 396 | const char * |
| 397 | event_location_to_string (struct event_location *location) |
| 398 | { |
| 399 | if (EL_STRING (location) == NULL) |
| 400 | { |
| 401 | switch (EL_TYPE (location)) |
| 402 | { |
| 403 | case LINESPEC_LOCATION: |
| 404 | if (EL_LINESPEC (location)->spec_string != NULL) |
| 405 | { |
| 406 | linespec_location *ls = EL_LINESPEC (location); |
| 407 | if (ls->match_type == symbol_name_match_type::FULL) |
| 408 | { |
| 409 | EL_STRING (location) |
| 410 | = concat ("-qualified ", ls->spec_string, (char *) NULL); |
| 411 | } |
| 412 | else |
| 413 | EL_STRING (location) = xstrdup (ls->spec_string); |
| 414 | } |
| 415 | break; |
| 416 | |
| 417 | case ADDRESS_LOCATION: |
| 418 | EL_STRING (location) |
| 419 | = xstrprintf ("*%s", |
| 420 | core_addr_to_string (EL_ADDRESS (location))); |
| 421 | break; |
| 422 | |
| 423 | case EXPLICIT_LOCATION: |
| 424 | EL_STRING (location) |
| 425 | = explicit_location_to_string (EL_EXPLICIT (location)); |
| 426 | break; |
| 427 | |
| 428 | case PROBE_LOCATION: |
| 429 | EL_STRING (location) = xstrdup (EL_PROBE (location)); |
| 430 | break; |
| 431 | |
| 432 | default: |
| 433 | gdb_assert_not_reached ("unknown event location type"); |
| 434 | } |
| 435 | } |
| 436 | |
| 437 | return EL_STRING (location); |
| 438 | } |
| 439 | |
| 440 | /* Find an instance of the quote character C in the string S that is |
| 441 | outside of all single- and double-quoted strings (i.e., any quoting |
| 442 | other than C). */ |
| 443 | |
| 444 | static const char * |
| 445 | find_end_quote (const char *s, char end_quote_char) |
| 446 | { |
| 447 | /* zero if we're not in quotes; |
| 448 | '"' if we're in a double-quoted string; |
| 449 | '\'' if we're in a single-quoted string. */ |
| 450 | char nested_quote_char = '\0'; |
| 451 | |
| 452 | for (const char *scan = s; *scan != '\0'; scan++) |
| 453 | { |
| 454 | if (nested_quote_char != '\0') |
| 455 | { |
| 456 | if (*scan == nested_quote_char) |
| 457 | nested_quote_char = '\0'; |
| 458 | else if (scan[0] == '\\' && *(scan + 1) != '\0') |
| 459 | scan++; |
| 460 | } |
| 461 | else if (*scan == end_quote_char && nested_quote_char == '\0') |
| 462 | return scan; |
| 463 | else if (*scan == '"' || *scan == '\'') |
| 464 | nested_quote_char = *scan; |
| 465 | } |
| 466 | |
| 467 | return 0; |
| 468 | } |
| 469 | |
| 470 | /* A lexer for explicit locations. This function will advance INP |
| 471 | past any strings that it lexes. Returns a malloc'd copy of the |
| 472 | lexed string or NULL if no lexing was done. */ |
| 473 | |
| 474 | static gdb::unique_xmalloc_ptr<char> |
| 475 | explicit_location_lex_one (const char **inp, |
| 476 | const struct language_defn *language, |
| 477 | explicit_completion_info *completion_info) |
| 478 | { |
| 479 | const char *start = *inp; |
| 480 | |
| 481 | if (*start == '\0') |
| 482 | return NULL; |
| 483 | |
| 484 | /* If quoted, skip to the ending quote. */ |
| 485 | if (strchr (get_gdb_linespec_parser_quote_characters (), *start)) |
| 486 | { |
| 487 | if (completion_info != NULL) |
| 488 | completion_info->quoted_arg_start = start; |
| 489 | |
| 490 | const char *end = find_end_quote (start + 1, *start); |
| 491 | |
| 492 | if (end == NULL) |
| 493 | { |
| 494 | if (completion_info == NULL) |
| 495 | error (_("Unmatched quote, %s."), start); |
| 496 | |
| 497 | end = start + strlen (start); |
| 498 | *inp = end; |
| 499 | return gdb::unique_xmalloc_ptr<char> (savestring (start + 1, |
| 500 | *inp - start - 1)); |
| 501 | } |
| 502 | |
| 503 | if (completion_info != NULL) |
| 504 | completion_info->quoted_arg_end = end; |
| 505 | *inp = end + 1; |
| 506 | return gdb::unique_xmalloc_ptr<char> (savestring (start + 1, |
| 507 | *inp - start - 2)); |
| 508 | } |
| 509 | |
| 510 | /* If the input starts with '-' or '+', the string ends with the next |
| 511 | whitespace or comma. */ |
| 512 | if (*start == '-' || *start == '+') |
| 513 | { |
| 514 | while (*inp[0] != '\0' && *inp[0] != ',' && !isspace (*inp[0])) |
| 515 | ++(*inp); |
| 516 | } |
| 517 | else |
| 518 | { |
| 519 | /* Handle numbers first, stopping at the next whitespace or ','. */ |
| 520 | while (isdigit (*inp[0])) |
| 521 | ++(*inp); |
| 522 | if (*inp[0] == '\0' || isspace (*inp[0]) || *inp[0] == ',') |
| 523 | return gdb::unique_xmalloc_ptr<char> (savestring (start, |
| 524 | *inp - start)); |
| 525 | |
| 526 | /* Otherwise stop at the next occurrence of whitespace, '\0', |
| 527 | keyword, or ','. */ |
| 528 | *inp = start; |
| 529 | while ((*inp)[0] |
| 530 | && (*inp)[0] != ',' |
| 531 | && !(isspace ((*inp)[0]) |
| 532 | || linespec_lexer_lex_keyword (&(*inp)[1]))) |
| 533 | { |
| 534 | /* Special case: C++ operator,. */ |
| 535 | if (language->la_language == language_cplus |
| 536 | && startswith (*inp, CP_OPERATOR_STR)) |
| 537 | (*inp) += CP_OPERATOR_LEN; |
| 538 | ++(*inp); |
| 539 | } |
| 540 | } |
| 541 | |
| 542 | if (*inp - start > 0) |
| 543 | return gdb::unique_xmalloc_ptr<char> (savestring (start, *inp - start)); |
| 544 | |
| 545 | return NULL; |
| 546 | } |
| 547 | |
| 548 | /* Return true if COMMA points past "operator". START is the start of |
| 549 | the line that COMMAND points to, hence when reading backwards, we |
| 550 | must not read any character before START. */ |
| 551 | |
| 552 | static bool |
| 553 | is_cp_operator (const char *start, const char *comma) |
| 554 | { |
| 555 | if (comma != NULL |
| 556 | && (comma - start) >= CP_OPERATOR_LEN) |
| 557 | { |
| 558 | const char *p = comma; |
| 559 | |
| 560 | while (p > start && isspace (p[-1])) |
| 561 | p--; |
| 562 | if (p - start >= CP_OPERATOR_LEN) |
| 563 | { |
| 564 | p -= CP_OPERATOR_LEN; |
| 565 | if (strncmp (p, CP_OPERATOR_STR, CP_OPERATOR_LEN) == 0 |
| 566 | && (p == start |
| 567 | || !(isalnum (p[-1]) || p[-1] == '_'))) |
| 568 | { |
| 569 | return true; |
| 570 | } |
| 571 | } |
| 572 | } |
| 573 | return false; |
| 574 | } |
| 575 | |
| 576 | /* When scanning the input string looking for the next explicit |
| 577 | location option/delimiter, we jump to the next option by looking |
| 578 | for ",", and "-". Such a character can also appear in C++ symbols |
| 579 | like "operator," and "operator-". So when we find such a |
| 580 | character, we call this function to check if we found such a |
| 581 | symbol, meaning we had a false positive for an option string. In |
| 582 | that case, we keep looking for the next delimiter, until we find |
| 583 | one that is not a false positive, or we reach end of string. FOUND |
| 584 | is the character that scanning found (either '-' or ','), and START |
| 585 | is the start of the line that FOUND points to, hence when reading |
| 586 | backwards, we must not read any character before START. Returns a |
| 587 | pointer to the next non-false-positive delimiter character, or NULL |
| 588 | if none was found. */ |
| 589 | |
| 590 | static const char * |
| 591 | skip_op_false_positives (const char *start, const char *found) |
| 592 | { |
| 593 | while (found != NULL && is_cp_operator (start, found)) |
| 594 | { |
| 595 | if (found[0] == '-' && found[1] == '-') |
| 596 | start = found + 2; |
| 597 | else |
| 598 | start = found + 1; |
| 599 | found = find_toplevel_char (start, *found); |
| 600 | } |
| 601 | |
| 602 | return found; |
| 603 | } |
| 604 | |
| 605 | /* Assuming both FIRST and NEW_TOK point into the same string, return |
| 606 | the pointer that is closer to the start of the string. If FIRST is |
| 607 | NULL, returns NEW_TOK. If NEW_TOK is NULL, returns FIRST. */ |
| 608 | |
| 609 | static const char * |
| 610 | first_of (const char *first, const char *new_tok) |
| 611 | { |
| 612 | if (first == NULL) |
| 613 | return new_tok; |
| 614 | else if (new_tok != NULL && new_tok < first) |
| 615 | return new_tok; |
| 616 | else |
| 617 | return first; |
| 618 | } |
| 619 | |
| 620 | /* A lexer for functions in explicit locations. This function will |
| 621 | advance INP past a function until the next option, or until end of |
| 622 | string. Returns a malloc'd copy of the lexed string or NULL if no |
| 623 | lexing was done. */ |
| 624 | |
| 625 | static gdb::unique_xmalloc_ptr<char> |
| 626 | explicit_location_lex_one_function (const char **inp, |
| 627 | const struct language_defn *language, |
| 628 | explicit_completion_info *completion_info) |
| 629 | { |
| 630 | const char *start = *inp; |
| 631 | |
| 632 | if (*start == '\0') |
| 633 | return NULL; |
| 634 | |
| 635 | /* If quoted, skip to the ending quote. */ |
| 636 | if (strchr (get_gdb_linespec_parser_quote_characters (), *start)) |
| 637 | { |
| 638 | char quote_char = *start; |
| 639 | |
| 640 | /* If the input is not an Ada operator, skip to the matching |
| 641 | closing quote and return the string. */ |
| 642 | if (!(language->la_language == language_ada |
| 643 | && quote_char == '\"' && is_ada_operator (start))) |
| 644 | { |
| 645 | if (completion_info != NULL) |
| 646 | completion_info->quoted_arg_start = start; |
| 647 | |
| 648 | const char *end = find_toplevel_char (start + 1, quote_char); |
| 649 | |
| 650 | if (end == NULL) |
| 651 | { |
| 652 | if (completion_info == NULL) |
| 653 | error (_("Unmatched quote, %s."), start); |
| 654 | |
| 655 | end = start + strlen (start); |
| 656 | *inp = end; |
| 657 | char *saved = savestring (start + 1, *inp - start - 1); |
| 658 | return gdb::unique_xmalloc_ptr<char> (saved); |
| 659 | } |
| 660 | |
| 661 | if (completion_info != NULL) |
| 662 | completion_info->quoted_arg_end = end; |
| 663 | *inp = end + 1; |
| 664 | char *saved = savestring (start + 1, *inp - start - 2); |
| 665 | return gdb::unique_xmalloc_ptr<char> (saved); |
| 666 | } |
| 667 | } |
| 668 | |
| 669 | const char *comma = find_toplevel_char (start, ','); |
| 670 | |
| 671 | /* If we have "-function -myfunction", or perhaps better example, |
| 672 | "-function -[BasicClass doIt]" (objc selector), treat |
| 673 | "-myfunction" as the function name. I.e., skip the first char if |
| 674 | it is an hyphen. Don't skip the first char always, because we |
| 675 | may have C++ "operator<", and find_toplevel_char needs to see the |
| 676 | 'o' in that case. */ |
| 677 | const char *hyphen |
| 678 | = (*start == '-' |
| 679 | ? find_toplevel_char (start + 1, '-') |
| 680 | : find_toplevel_char (start, '-')); |
| 681 | |
| 682 | /* Check for C++ "operator," and "operator-". */ |
| 683 | comma = skip_op_false_positives (start, comma); |
| 684 | hyphen = skip_op_false_positives (start, hyphen); |
| 685 | |
| 686 | /* Pick the one that appears first. */ |
| 687 | const char *end = first_of (hyphen, comma); |
| 688 | |
| 689 | /* See if a linespec keyword appears first. */ |
| 690 | const char *s = start; |
| 691 | const char *ws = find_toplevel_char (start, ' '); |
| 692 | while (ws != NULL && linespec_lexer_lex_keyword (ws + 1) == NULL) |
| 693 | { |
| 694 | s = ws + 1; |
| 695 | ws = find_toplevel_char (s, ' '); |
| 696 | } |
| 697 | if (ws != NULL) |
| 698 | end = first_of (end, ws + 1); |
| 699 | |
| 700 | /* If we don't have any terminator, then take the whole string. */ |
| 701 | if (end == NULL) |
| 702 | end = start + strlen (start); |
| 703 | |
| 704 | /* Trim whitespace at the end. */ |
| 705 | while (end > start && end[-1] == ' ') |
| 706 | end--; |
| 707 | |
| 708 | *inp = end; |
| 709 | |
| 710 | if (*inp - start > 0) |
| 711 | return gdb::unique_xmalloc_ptr<char> (savestring (start, *inp - start)); |
| 712 | |
| 713 | return NULL; |
| 714 | } |
| 715 | |
| 716 | /* See description in location.h. */ |
| 717 | |
| 718 | event_location_up |
| 719 | string_to_explicit_location (const char **argp, |
| 720 | const struct language_defn *language, |
| 721 | explicit_completion_info *completion_info) |
| 722 | { |
| 723 | event_location_up location; |
| 724 | |
| 725 | /* It is assumed that input beginning with '-' and a non-digit |
| 726 | character is an explicit location. "-p" is reserved, though, |
| 727 | for probe locations. */ |
| 728 | if (argp == NULL |
| 729 | || *argp == NULL |
| 730 | || *argp[0] != '-' |
| 731 | || !isalpha ((*argp)[1]) |
| 732 | || ((*argp)[0] == '-' && (*argp)[1] == 'p')) |
| 733 | return NULL; |
| 734 | |
| 735 | location = new_explicit_location (NULL); |
| 736 | |
| 737 | /* Process option/argument pairs. dprintf_command |
| 738 | requires that processing stop on ','. */ |
| 739 | while ((*argp)[0] != '\0' && (*argp)[0] != ',') |
| 740 | { |
| 741 | int len; |
| 742 | const char *start; |
| 743 | |
| 744 | /* Clear these on each iteration, since they should be filled |
| 745 | with info about the last option. */ |
| 746 | if (completion_info != NULL) |
| 747 | { |
| 748 | completion_info->quoted_arg_start = NULL; |
| 749 | completion_info->quoted_arg_end = NULL; |
| 750 | } |
| 751 | |
| 752 | /* If *ARGP starts with a keyword, stop processing |
| 753 | options. */ |
| 754 | if (linespec_lexer_lex_keyword (*argp) != NULL) |
| 755 | break; |
| 756 | |
| 757 | /* Mark the start of the string in case we need to rewind. */ |
| 758 | start = *argp; |
| 759 | |
| 760 | if (completion_info != NULL) |
| 761 | completion_info->last_option = start; |
| 762 | |
| 763 | /* Get the option string. */ |
| 764 | gdb::unique_xmalloc_ptr<char> opt |
| 765 | = explicit_location_lex_one (argp, language, NULL); |
| 766 | |
| 767 | /* Use the length of the option to allow abbreviations. */ |
| 768 | len = strlen (opt.get ()); |
| 769 | |
| 770 | /* Get the argument string. */ |
| 771 | *argp = skip_spaces (*argp); |
| 772 | |
| 773 | /* All options have a required argument. Checking for this |
| 774 | required argument is deferred until later. */ |
| 775 | gdb::unique_xmalloc_ptr<char> oarg; |
| 776 | /* True if we have an argument. This is required because we'll |
| 777 | move from OARG before checking whether we have an |
| 778 | argument. */ |
| 779 | bool have_oarg = false; |
| 780 | |
| 781 | /* True if the option needs an argument. */ |
| 782 | bool need_oarg = false; |
| 783 | |
| 784 | /* Convenience to consistently set both OARG/HAVE_OARG from |
| 785 | ARG. */ |
| 786 | auto set_oarg = [&] (gdb::unique_xmalloc_ptr<char> arg) |
| 787 | { |
| 788 | if (completion_info != NULL) |
| 789 | { |
| 790 | /* We do this here because the set of options that take |
| 791 | arguments matches the set of explicit location |
| 792 | options. */ |
| 793 | completion_info->saw_explicit_location_option = true; |
| 794 | } |
| 795 | oarg = std::move (arg); |
| 796 | have_oarg = oarg != NULL; |
| 797 | need_oarg = true; |
| 798 | }; |
| 799 | |
| 800 | if (strncmp (opt.get (), "-source", len) == 0) |
| 801 | { |
| 802 | set_oarg (explicit_location_lex_one (argp, language, |
| 803 | completion_info)); |
| 804 | EL_EXPLICIT (location)->source_filename = oarg.release (); |
| 805 | } |
| 806 | else if (strncmp (opt.get (), "-function", len) == 0) |
| 807 | { |
| 808 | set_oarg (explicit_location_lex_one_function (argp, language, |
| 809 | completion_info)); |
| 810 | EL_EXPLICIT (location)->function_name = oarg.release (); |
| 811 | } |
| 812 | else if (strncmp (opt.get (), "-qualified", len) == 0) |
| 813 | { |
| 814 | EL_EXPLICIT (location)->func_name_match_type |
| 815 | = symbol_name_match_type::FULL; |
| 816 | } |
| 817 | else if (strncmp (opt.get (), "-line", len) == 0) |
| 818 | { |
| 819 | set_oarg (explicit_location_lex_one (argp, language, NULL)); |
| 820 | *argp = skip_spaces (*argp); |
| 821 | if (have_oarg) |
| 822 | { |
| 823 | EL_EXPLICIT (location)->line_offset |
| 824 | = linespec_parse_line_offset (oarg.get ()); |
| 825 | continue; |
| 826 | } |
| 827 | } |
| 828 | else if (strncmp (opt.get (), "-label", len) == 0) |
| 829 | { |
| 830 | set_oarg (explicit_location_lex_one (argp, language, completion_info)); |
| 831 | EL_EXPLICIT (location)->label_name = oarg.release (); |
| 832 | } |
| 833 | /* Only emit an "invalid argument" error for options |
| 834 | that look like option strings. */ |
| 835 | else if (opt.get ()[0] == '-' && !isdigit (opt.get ()[1])) |
| 836 | { |
| 837 | if (completion_info == NULL) |
| 838 | error (_("invalid explicit location argument, \"%s\""), opt.get ()); |
| 839 | } |
| 840 | else |
| 841 | { |
| 842 | /* End of the explicit location specification. |
| 843 | Stop parsing and return whatever explicit location was |
| 844 | parsed. */ |
| 845 | *argp = start; |
| 846 | break; |
| 847 | } |
| 848 | |
| 849 | *argp = skip_spaces (*argp); |
| 850 | |
| 851 | /* It's a little lame to error after the fact, but in this |
| 852 | case, it provides a much better user experience to issue |
| 853 | the "invalid argument" error before any missing |
| 854 | argument error. */ |
| 855 | if (need_oarg && !have_oarg && completion_info == NULL) |
| 856 | error (_("missing argument for \"%s\""), opt.get ()); |
| 857 | } |
| 858 | |
| 859 | /* One special error check: If a source filename was given |
| 860 | without offset, function, or label, issue an error. */ |
| 861 | if (EL_EXPLICIT (location)->source_filename != NULL |
| 862 | && EL_EXPLICIT (location)->function_name == NULL |
| 863 | && EL_EXPLICIT (location)->label_name == NULL |
| 864 | && (EL_EXPLICIT (location)->line_offset.sign == LINE_OFFSET_UNKNOWN) |
| 865 | && completion_info == NULL) |
| 866 | { |
| 867 | error (_("Source filename requires function, label, or " |
| 868 | "line offset.")); |
| 869 | } |
| 870 | |
| 871 | return location; |
| 872 | } |
| 873 | |
| 874 | /* See description in location.h. */ |
| 875 | |
| 876 | event_location_up |
| 877 | string_to_event_location_basic (const char **stringp, |
| 878 | const struct language_defn *language, |
| 879 | symbol_name_match_type match_type) |
| 880 | { |
| 881 | event_location_up location; |
| 882 | const char *cs; |
| 883 | |
| 884 | /* Try the input as a probe spec. */ |
| 885 | cs = *stringp; |
| 886 | if (cs != NULL && probe_linespec_to_static_ops (&cs) != NULL) |
| 887 | { |
| 888 | location = new_probe_location (*stringp); |
| 889 | *stringp += strlen (*stringp); |
| 890 | } |
| 891 | else |
| 892 | { |
| 893 | /* Try an address location. */ |
| 894 | if (*stringp != NULL && **stringp == '*') |
| 895 | { |
| 896 | const char *arg, *orig; |
| 897 | CORE_ADDR addr; |
| 898 | |
| 899 | orig = arg = *stringp; |
| 900 | addr = linespec_expression_to_pc (&arg); |
| 901 | location = new_address_location (addr, orig, arg - orig); |
| 902 | *stringp += arg - orig; |
| 903 | } |
| 904 | else |
| 905 | { |
| 906 | /* Everything else is a linespec. */ |
| 907 | location = new_linespec_location (stringp, match_type); |
| 908 | } |
| 909 | } |
| 910 | |
| 911 | return location; |
| 912 | } |
| 913 | |
| 914 | /* See description in location.h. */ |
| 915 | |
| 916 | event_location_up |
| 917 | string_to_event_location (const char **stringp, |
| 918 | const struct language_defn *language, |
| 919 | symbol_name_match_type match_type) |
| 920 | { |
| 921 | const char *arg, *orig; |
| 922 | |
| 923 | /* Try an explicit location. */ |
| 924 | orig = arg = *stringp; |
| 925 | event_location_up location = string_to_explicit_location (&arg, language, NULL); |
| 926 | if (location != NULL) |
| 927 | { |
| 928 | /* It was a valid explicit location. Advance STRINGP to |
| 929 | the end of input. */ |
| 930 | *stringp += arg - orig; |
| 931 | |
| 932 | /* If the user really specified a location, then we're done. */ |
| 933 | if (!event_location_empty_p (location.get ())) |
| 934 | return location; |
| 935 | |
| 936 | /* Otherwise, the user _only_ specified optional flags like |
| 937 | "-qualified", otherwise string_to_explicit_location would |
| 938 | have thrown an error. Save the flags for "basic" linespec |
| 939 | parsing below and discard the explicit location. */ |
| 940 | match_type = EL_EXPLICIT (location)->func_name_match_type; |
| 941 | } |
| 942 | |
| 943 | /* Everything else is a "basic" linespec, address, or probe |
| 944 | location. */ |
| 945 | return string_to_event_location_basic (stringp, language, match_type); |
| 946 | } |
| 947 | |
| 948 | /* See description in location.h. */ |
| 949 | |
| 950 | int |
| 951 | event_location_empty_p (const struct event_location *location) |
| 952 | { |
| 953 | switch (EL_TYPE (location)) |
| 954 | { |
| 955 | case LINESPEC_LOCATION: |
| 956 | /* Linespecs are never "empty." (NULL is a valid linespec) */ |
| 957 | return 0; |
| 958 | |
| 959 | case ADDRESS_LOCATION: |
| 960 | return 0; |
| 961 | |
| 962 | case EXPLICIT_LOCATION: |
| 963 | return (EL_EXPLICIT (location) == NULL |
| 964 | || (EL_EXPLICIT (location)->source_filename == NULL |
| 965 | && EL_EXPLICIT (location)->function_name == NULL |
| 966 | && EL_EXPLICIT (location)->label_name == NULL |
| 967 | && (EL_EXPLICIT (location)->line_offset.sign |
| 968 | == LINE_OFFSET_UNKNOWN))); |
| 969 | |
| 970 | case PROBE_LOCATION: |
| 971 | return EL_PROBE (location) == NULL; |
| 972 | |
| 973 | default: |
| 974 | gdb_assert_not_reached ("unknown event location type"); |
| 975 | } |
| 976 | } |
| 977 | |
| 978 | /* See description in location.h. */ |
| 979 | |
| 980 | void |
| 981 | set_event_location_string (struct event_location *location, |
| 982 | const char *string) |
| 983 | { |
| 984 | xfree (EL_STRING (location)); |
| 985 | EL_STRING (location) = string == NULL ? NULL : xstrdup (string); |
| 986 | } |