1 /* List lines of source files for GDB, the GNU debugger. 2 Copyright (C) 1986-2005, 2007-2012 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 "arch-utils.h" 21 #include "symtab.h" 22 #include "expression.h" 23 #include "language.h" 24 #include "command.h" 25 #include "source.h" 26 #include "gdbcmd.h" 27 #include "frame.h" 28 #include "value.h" 29 #include "gdb_assert.h" 30 31 #include <sys/types.h> 32 #include "gdb_string.h" 33 #include "gdb_stat.h" 34 #include <fcntl.h> 35 #include "gdbcore.h" 36 #include "gdb_regex.h" 37 #include "symfile.h" 38 #include "objfiles.h" 39 #include "annotate.h" 40 #include "gdbtypes.h" 41 #include "linespec.h" 42 #include "filenames.h" /* for DOSish file names */ 43 #include "completer.h" 44 #include "ui-out.h" 45 #include "readline/readline.h" 46 47 #include "psymtab.h" 48 49 50 #define OPEN_MODE (O_RDONLY | O_BINARY) 51 #define FDOPEN_MODE FOPEN_RB 52 53 /* Prototypes for exported functions. */ 54 55 void _initialize_source (void); 56 57 /* Prototypes for local functions. */ 58 59 static int get_filename_and_charpos (struct symtab *, char **); 60 61 static void reverse_search_command (char *, int); 62 63 static void forward_search_command (char *, int); 64 65 static void line_info (char *, int); 66 67 static void source_info (char *, int); 68 69 /* Path of directories to search for source files. 70 Same format as the PATH environment variable's value. */ 71 72 char *source_path; 73 74 /* Support for source path substitution commands. */ 75 76 struct substitute_path_rule 77 { 78 char *from; 79 char *to; 80 struct substitute_path_rule *next; 81 }; 82 83 static struct substitute_path_rule *substitute_path_rules = NULL; 84 85 /* Symtab of default file for listing lines of. */ 86 87 static struct symtab *current_source_symtab; 88 89 /* Default next line to list. */ 90 91 static int current_source_line; 92 93 static struct program_space *current_source_pspace; 94 95 /* Default number of lines to print with commands like "list". 96 This is based on guessing how many long (i.e. more than chars_per_line 97 characters) lines there will be. To be completely correct, "list" 98 and friends should be rewritten to count characters and see where 99 things are wrapping, but that would be a fair amount of work. */ 100 101 int lines_to_list = 10; 102 static void 103 show_lines_to_list (struct ui_file *file, int from_tty, 104 struct cmd_list_element *c, const char *value) 105 { 106 fprintf_filtered (file, 107 _("Number of source lines gdb " 108 "will list by default is %s.\n"), 109 value); 110 } 111 112 /* Line number of last line printed. Default for various commands. 113 current_source_line is usually, but not always, the same as this. */ 114 115 static int last_line_listed; 116 117 /* First line number listed by last listing command. */ 118 119 static int first_line_listed; 120 121 /* Saves the name of the last source file visited and a possible error code. 122 Used to prevent repeating annoying "No such file or directories" msgs. */ 123 124 static struct symtab *last_source_visited = NULL; 125 static int last_source_error = 0; 126 127 /* Return the first line listed by print_source_lines. 128 Used by command interpreters to request listing from 129 a previous point. */ 130 131 int 132 get_first_line_listed (void) 133 { 134 return first_line_listed; 135 } 136 137 /* Return the default number of lines to print with commands like the 138 cli "list". The caller of print_source_lines must use this to 139 calculate the end line and use it in the call to print_source_lines 140 as it does not automatically use this value. */ 141 142 int 143 get_lines_to_list (void) 144 { 145 return lines_to_list; 146 } 147 148 /* Return the current source file for listing and next line to list. 149 NOTE: The returned sal pc and end fields are not valid. */ 150 151 struct symtab_and_line 152 get_current_source_symtab_and_line (void) 153 { 154 struct symtab_and_line cursal = { 0 }; 155 156 cursal.pspace = current_source_pspace; 157 cursal.symtab = current_source_symtab; 158 cursal.line = current_source_line; 159 cursal.pc = 0; 160 cursal.end = 0; 161 162 return cursal; 163 } 164 165 /* If the current source file for listing is not set, try and get a default. 166 Usually called before get_current_source_symtab_and_line() is called. 167 It may err out if a default cannot be determined. 168 We must be cautious about where it is called, as it can recurse as the 169 process of determining a new default may call the caller! 170 Use get_current_source_symtab_and_line only to get whatever 171 we have without erroring out or trying to get a default. */ 172 173 void 174 set_default_source_symtab_and_line (void) 175 { 176 if (!have_full_symbols () && !have_partial_symbols ()) 177 error (_("No symbol table is loaded. Use the \"file\" command.")); 178 179 /* Pull in a current source symtab if necessary. */ 180 if (current_source_symtab == 0) 181 select_source_symtab (0); 182 } 183 184 /* Return the current default file for listing and next line to list 185 (the returned sal pc and end fields are not valid.) 186 and set the current default to whatever is in SAL. 187 NOTE: The returned sal pc and end fields are not valid. */ 188 189 struct symtab_and_line 190 set_current_source_symtab_and_line (const struct symtab_and_line *sal) 191 { 192 struct symtab_and_line cursal = { 0 }; 193 194 cursal.pspace = current_source_pspace; 195 cursal.symtab = current_source_symtab; 196 cursal.line = current_source_line; 197 cursal.pc = 0; 198 cursal.end = 0; 199 200 current_source_pspace = sal->pspace; 201 current_source_symtab = sal->symtab; 202 current_source_line = sal->line; 203 204 return cursal; 205 } 206 207 /* Reset any information stored about a default file and line to print. */ 208 209 void 210 clear_current_source_symtab_and_line (void) 211 { 212 current_source_symtab = 0; 213 current_source_line = 0; 214 } 215 216 /* Set the source file default for the "list" command to be S. 217 218 If S is NULL, and we don't have a default, find one. This 219 should only be called when the user actually tries to use the 220 default, since we produce an error if we can't find a reasonable 221 default. Also, since this can cause symbols to be read, doing it 222 before we need to would make things slower than necessary. */ 223 224 void 225 select_source_symtab (struct symtab *s) 226 { 227 struct symtabs_and_lines sals; 228 struct symtab_and_line sal; 229 struct objfile *ofp; 230 231 if (s) 232 { 233 current_source_symtab = s; 234 current_source_line = 1; 235 current_source_pspace = SYMTAB_PSPACE (s); 236 return; 237 } 238 239 if (current_source_symtab) 240 return; 241 242 /* Make the default place to list be the function `main' 243 if one exists. */ 244 if (lookup_symbol (main_name (), 0, VAR_DOMAIN, 0)) 245 { 246 sals = decode_line_spec (main_name (), DECODE_LINE_FUNFIRSTLINE); 247 sal = sals.sals[0]; 248 xfree (sals.sals); 249 current_source_pspace = sal.pspace; 250 current_source_symtab = sal.symtab; 251 current_source_line = max (sal.line - (lines_to_list - 1), 1); 252 if (current_source_symtab) 253 return; 254 } 255 256 /* Alright; find the last file in the symtab list (ignoring .h's 257 and namespace symtabs). */ 258 259 current_source_line = 1; 260 261 ALL_OBJFILES (ofp) 262 { 263 for (s = ofp->symtabs; s; s = s->next) 264 { 265 const char *name = s->filename; 266 int len = strlen (name); 267 268 if (!(len > 2 && (strcmp (&name[len - 2], ".h") == 0 269 || strcmp (name, "<<C++-namespaces>>") == 0))) 270 { 271 current_source_pspace = current_program_space; 272 current_source_symtab = s; 273 } 274 } 275 } 276 277 if (current_source_symtab) 278 return; 279 280 ALL_OBJFILES (ofp) 281 { 282 if (ofp->sf) 283 s = ofp->sf->qf->find_last_source_symtab (ofp); 284 if (s) 285 current_source_symtab = s; 286 } 287 if (current_source_symtab) 288 return; 289 290 error (_("Can't find a default source file")); 291 } 292 293 /* Handler for "set directories path-list" command. 294 "set dir mumble" doesn't prepend paths, it resets the entire 295 path list. The theory is that set(show(dir)) should be a no-op. */ 296 297 static void 298 set_directories_command (char *args, int from_tty, struct cmd_list_element *c) 299 { 300 /* This is the value that was set. 301 It needs to be processed to maintain $cdir:$cwd and remove dups. */ 302 char *set_path = source_path; 303 304 /* We preserve the invariant that $cdir:$cwd begins life at the end of 305 the list by calling init_source_path. If they appear earlier in 306 SET_PATH then mod_path will move them appropriately. 307 mod_path will also remove duplicates. */ 308 init_source_path (); 309 if (*set_path != '\0') 310 mod_path (set_path, &source_path); 311 312 xfree (set_path); 313 } 314 315 /* Print the list of source directories. 316 This is used by the "ld" command, so it has the signature of a command 317 function. */ 318 319 static void 320 show_directories_1 (char *ignore, int from_tty) 321 { 322 puts_filtered ("Source directories searched: "); 323 puts_filtered (source_path); 324 puts_filtered ("\n"); 325 } 326 327 /* Handler for "show directories" command. */ 328 329 static void 330 show_directories_command (struct ui_file *file, int from_tty, 331 struct cmd_list_element *c, const char *value) 332 { 333 show_directories_1 (NULL, from_tty); 334 } 335 336 /* Forget line positions and file names for the symtabs in a 337 particular objfile. */ 338 339 void 340 forget_cached_source_info_for_objfile (struct objfile *objfile) 341 { 342 struct symtab *s; 343 344 ALL_OBJFILE_SYMTABS (objfile, s) 345 { 346 if (s->line_charpos != NULL) 347 { 348 xfree (s->line_charpos); 349 s->line_charpos = NULL; 350 } 351 if (s->fullname != NULL) 352 { 353 xfree (s->fullname); 354 s->fullname = NULL; 355 } 356 } 357 358 if (objfile->sf) 359 objfile->sf->qf->forget_cached_source_info (objfile); 360 } 361 362 /* Forget what we learned about line positions in source files, and 363 which directories contain them; must check again now since files 364 may be found in a different directory now. */ 365 366 void 367 forget_cached_source_info (void) 368 { 369 struct program_space *pspace; 370 struct objfile *objfile; 371 372 ALL_PSPACES (pspace) 373 ALL_PSPACE_OBJFILES (pspace, objfile) 374 { 375 forget_cached_source_info_for_objfile (objfile); 376 } 377 378 last_source_visited = NULL; 379 } 380 381 void 382 init_source_path (void) 383 { 384 char buf[20]; 385 386 sprintf (buf, "$cdir%c$cwd", DIRNAME_SEPARATOR); 387 source_path = xstrdup (buf); 388 forget_cached_source_info (); 389 } 390 391 /* Add zero or more directories to the front of the source path. */ 392 393 void 394 directory_command (char *dirname, int from_tty) 395 { 396 dont_repeat (); 397 /* FIXME, this goes to "delete dir"... */ 398 if (dirname == 0) 399 { 400 if (!from_tty || query (_("Reinitialize source path to empty? "))) 401 { 402 xfree (source_path); 403 init_source_path (); 404 } 405 } 406 else 407 { 408 mod_path (dirname, &source_path); 409 forget_cached_source_info (); 410 } 411 if (from_tty) 412 show_directories_1 ((char *) 0, from_tty); 413 } 414 415 /* Add a path given with the -d command line switch. 416 This will not be quoted so we must not treat spaces as separators. */ 417 418 void 419 directory_switch (char *dirname, int from_tty) 420 { 421 add_path (dirname, &source_path, 0); 422 } 423 424 /* Add zero or more directories to the front of an arbitrary path. */ 425 426 void 427 mod_path (char *dirname, char **which_path) 428 { 429 add_path (dirname, which_path, 1); 430 } 431 432 /* Workhorse of mod_path. Takes an extra argument to determine 433 if dirname should be parsed for separators that indicate multiple 434 directories. This allows for interfaces that pre-parse the dirname 435 and allow specification of traditional separator characters such 436 as space or tab. */ 437 438 void 439 add_path (char *dirname, char **which_path, int parse_separators) 440 { 441 char *old = *which_path; 442 int prefix = 0; 443 char **argv = NULL; 444 char *arg; 445 int argv_index = 0; 446 447 if (dirname == 0) 448 return; 449 450 if (parse_separators) 451 { 452 /* This will properly parse the space and tab separators 453 and any quotes that may exist. DIRNAME_SEPARATOR will 454 be dealt with later. */ 455 argv = gdb_buildargv (dirname); 456 make_cleanup_freeargv (argv); 457 458 arg = argv[0]; 459 } 460 else 461 { 462 arg = xstrdup (dirname); 463 make_cleanup (xfree, arg); 464 } 465 466 do 467 { 468 char *name = arg; 469 char *p; 470 struct stat st; 471 472 { 473 char *separator = NULL; 474 475 /* Spaces and tabs will have been removed by buildargv(). 476 The directories will there be split into a list but 477 each entry may still contain DIRNAME_SEPARATOR. */ 478 if (parse_separators) 479 separator = strchr (name, DIRNAME_SEPARATOR); 480 481 if (separator == 0) 482 p = arg = name + strlen (name); 483 else 484 { 485 p = separator; 486 arg = p + 1; 487 while (*arg == DIRNAME_SEPARATOR) 488 ++arg; 489 } 490 491 /* If there are no more directories in this argument then start 492 on the next argument next time round the loop (if any). */ 493 if (*arg == '\0') 494 arg = parse_separators ? argv[++argv_index] : NULL; 495 } 496 497 /* name is the start of the directory. 498 p is the separator (or null) following the end. */ 499 500 while (!(IS_DIR_SEPARATOR (*name) && p <= name + 1) /* "/" */ 501 #ifdef HAVE_DOS_BASED_FILE_SYSTEM 502 /* On MS-DOS and MS-Windows, h:\ is different from h: */ 503 && !(p == name + 3 && name[1] == ':') /* "d:/" */ 504 #endif 505 && IS_DIR_SEPARATOR (p[-1])) 506 /* Sigh. "foo/" => "foo" */ 507 --p; 508 *p = '\0'; 509 510 while (p > name && p[-1] == '.') 511 { 512 if (p - name == 1) 513 { 514 /* "." => getwd (). */ 515 name = current_directory; 516 goto append; 517 } 518 else if (p > name + 1 && IS_DIR_SEPARATOR (p[-2])) 519 { 520 if (p - name == 2) 521 { 522 /* "/." => "/". */ 523 *--p = '\0'; 524 goto append; 525 } 526 else 527 { 528 /* "...foo/." => "...foo". */ 529 p -= 2; 530 *p = '\0'; 531 continue; 532 } 533 } 534 else 535 break; 536 } 537 538 if (name[0] == '~') 539 name = tilde_expand (name); 540 #ifdef HAVE_DOS_BASED_FILE_SYSTEM 541 else if (IS_ABSOLUTE_PATH (name) && p == name + 2) /* "d:" => "d:." */ 542 name = concat (name, ".", (char *)NULL); 543 #endif 544 else if (!IS_ABSOLUTE_PATH (name) && name[0] != '$') 545 name = concat (current_directory, SLASH_STRING, name, (char *)NULL); 546 else 547 name = savestring (name, p - name); 548 make_cleanup (xfree, name); 549 550 /* Unless it's a variable, check existence. */ 551 if (name[0] != '$') 552 { 553 /* These are warnings, not errors, since we don't want a 554 non-existent directory in a .gdbinit file to stop processing 555 of the .gdbinit file. 556 557 Whether they get added to the path is more debatable. Current 558 answer is yes, in case the user wants to go make the directory 559 or whatever. If the directory continues to not exist/not be 560 a directory/etc, then having them in the path should be 561 harmless. */ 562 if (stat (name, &st) < 0) 563 { 564 int save_errno = errno; 565 566 fprintf_unfiltered (gdb_stderr, "Warning: "); 567 print_sys_errmsg (name, save_errno); 568 } 569 else if ((st.st_mode & S_IFMT) != S_IFDIR) 570 warning (_("%s is not a directory."), name); 571 } 572 573 append: 574 { 575 unsigned int len = strlen (name); 576 577 p = *which_path; 578 while (1) 579 { 580 /* FIXME: we should use realpath() or its work-alike 581 before comparing. Then all the code above which 582 removes excess slashes and dots could simply go away. */ 583 if (!filename_ncmp (p, name, len) 584 && (p[len] == '\0' || p[len] == DIRNAME_SEPARATOR)) 585 { 586 /* Found it in the search path, remove old copy. */ 587 if (p > *which_path) 588 p--; /* Back over leading separator. */ 589 if (prefix > p - *which_path) 590 goto skip_dup; /* Same dir twice in one cmd. */ 591 strcpy (p, &p[len + 1]); /* Copy from next \0 or : */ 592 } 593 p = strchr (p, DIRNAME_SEPARATOR); 594 if (p != 0) 595 ++p; 596 else 597 break; 598 } 599 if (p == 0) 600 { 601 char tinybuf[2]; 602 603 tinybuf[0] = DIRNAME_SEPARATOR; 604 tinybuf[1] = '\0'; 605 606 /* If we have already tacked on a name(s) in this command, 607 be sure they stay on the front as we tack on some 608 more. */ 609 if (prefix) 610 { 611 char *temp, c; 612 613 c = old[prefix]; 614 old[prefix] = '\0'; 615 temp = concat (old, tinybuf, name, (char *)NULL); 616 old[prefix] = c; 617 *which_path = concat (temp, "", &old[prefix], (char *) NULL); 618 prefix = strlen (temp); 619 xfree (temp); 620 } 621 else 622 { 623 *which_path = concat (name, (old[0] ? tinybuf : old), 624 old, (char *)NULL); 625 prefix = strlen (name); 626 } 627 xfree (old); 628 old = *which_path; 629 } 630 } 631 skip_dup: 632 ; 633 } 634 while (arg != NULL); 635 } 636 637 638 static void 639 source_info (char *ignore, int from_tty) 640 { 641 struct symtab *s = current_source_symtab; 642 643 if (!s) 644 { 645 printf_filtered (_("No current source file.\n")); 646 return; 647 } 648 printf_filtered (_("Current source file is %s\n"), s->filename); 649 if (s->dirname) 650 printf_filtered (_("Compilation directory is %s\n"), s->dirname); 651 if (s->fullname) 652 printf_filtered (_("Located in %s\n"), s->fullname); 653 if (s->nlines) 654 printf_filtered (_("Contains %d line%s.\n"), s->nlines, 655 s->nlines == 1 ? "" : "s"); 656 657 printf_filtered (_("Source language is %s.\n"), language_str (s->language)); 658 printf_filtered (_("Compiled with %s debugging format.\n"), s->debugformat); 659 printf_filtered (_("%s preprocessor macro info.\n"), 660 s->macro_table ? "Includes" : "Does not include"); 661 } 662 663 664 /* Return True if the file NAME exists and is a regular file. */ 665 static int 666 is_regular_file (const char *name) 667 { 668 struct stat st; 669 const int status = stat (name, &st); 670 671 /* Stat should never fail except when the file does not exist. 672 If stat fails, analyze the source of error and return True 673 unless the file does not exist, to avoid returning false results 674 on obscure systems where stat does not work as expected. */ 675 676 if (status != 0) 677 return (errno != ENOENT); 678 679 return S_ISREG (st.st_mode); 680 } 681 682 /* Open a file named STRING, searching path PATH (dir names sep by some char) 683 using mode MODE in the calls to open. You cannot use this function to 684 create files (O_CREAT). 685 686 OPTS specifies the function behaviour in specific cases. 687 688 If OPF_TRY_CWD_FIRST, try to open ./STRING before searching PATH. 689 (ie pretend the first element of PATH is "."). This also indicates 690 that a slash in STRING disables searching of the path (this is 691 so that "exec-file ./foo" or "symbol-file ./foo" insures that you 692 get that particular version of foo or an error message). 693 694 If OPTS has OPF_SEARCH_IN_PATH set, absolute names will also be 695 searched in path (we usually want this for source files but not for 696 executables). 697 698 If FILENAME_OPENED is non-null, set it to a newly allocated string naming 699 the actual file opened (this string will always start with a "/"). We 700 have to take special pains to avoid doubling the "/" between the directory 701 and the file, sigh! Emacs gets confuzzed by this when we print the 702 source file name!!! 703 704 If a file is found, return the descriptor. 705 Otherwise, return -1, with errno set for the last name we tried to open. */ 706 707 /* >>>> This should only allow files of certain types, 708 >>>> eg executable, non-directory. */ 709 int 710 openp (const char *path, int opts, const char *string, 711 int mode, char **filename_opened) 712 { 713 int fd; 714 char *filename; 715 const char *p; 716 const char *p1; 717 int len; 718 int alloclen; 719 720 /* The open syscall MODE parameter is not specified. */ 721 gdb_assert ((mode & O_CREAT) == 0); 722 gdb_assert (string != NULL); 723 724 /* A file with an empty name cannot possibly exist. Report a failure 725 without further checking. 726 727 This is an optimization which also defends us against buggy 728 implementations of the "stat" function. For instance, we have 729 noticed that a MinGW debugger built on Windows XP 32bits crashes 730 when the debugger is started with an empty argument. */ 731 if (string[0] == '\0') 732 { 733 errno = ENOENT; 734 return -1; 735 } 736 737 if (!path) 738 path = "."; 739 740 mode |= O_BINARY; 741 742 if ((opts & OPF_TRY_CWD_FIRST) || IS_ABSOLUTE_PATH (string)) 743 { 744 int i; 745 746 if (is_regular_file (string)) 747 { 748 filename = alloca (strlen (string) + 1); 749 strcpy (filename, string); 750 fd = open (filename, mode); 751 if (fd >= 0) 752 goto done; 753 } 754 else 755 { 756 filename = NULL; 757 fd = -1; 758 } 759 760 if (!(opts & OPF_SEARCH_IN_PATH)) 761 for (i = 0; string[i]; i++) 762 if (IS_DIR_SEPARATOR (string[i])) 763 goto done; 764 } 765 766 /* For dos paths, d:/foo -> /foo, and d:foo -> foo. */ 767 if (HAS_DRIVE_SPEC (string)) 768 string = STRIP_DRIVE_SPEC (string); 769 770 /* /foo => foo, to avoid multiple slashes that Emacs doesn't like. */ 771 while (IS_DIR_SEPARATOR(string[0])) 772 string++; 773 774 /* ./foo => foo */ 775 while (string[0] == '.' && IS_DIR_SEPARATOR (string[1])) 776 string += 2; 777 778 alloclen = strlen (path) + strlen (string) + 2; 779 filename = alloca (alloclen); 780 fd = -1; 781 for (p = path; p; p = p1 ? p1 + 1 : 0) 782 { 783 p1 = strchr (p, DIRNAME_SEPARATOR); 784 if (p1) 785 len = p1 - p; 786 else 787 len = strlen (p); 788 789 if (len == 4 && p[0] == '$' && p[1] == 'c' 790 && p[2] == 'w' && p[3] == 'd') 791 { 792 /* Name is $cwd -- insert current directory name instead. */ 793 int newlen; 794 795 /* First, realloc the filename buffer if too short. */ 796 len = strlen (current_directory); 797 newlen = len + strlen (string) + 2; 798 if (newlen > alloclen) 799 { 800 alloclen = newlen; 801 filename = alloca (alloclen); 802 } 803 strcpy (filename, current_directory); 804 } 805 else 806 { 807 /* Normal file name in path -- just use it. */ 808 strncpy (filename, p, len); 809 filename[len] = 0; 810 811 /* Don't search $cdir. It's also a magic path like $cwd, but we 812 don't have enough information to expand it. The user *could* 813 have an actual directory named '$cdir' but handling that would 814 be confusing, it would mean different things in different 815 contexts. If the user really has '$cdir' one can use './$cdir'. 816 We can get $cdir when loading scripts. When loading source files 817 $cdir must have already been expanded to the correct value. */ 818 if (strcmp (filename, "$cdir") == 0) 819 continue; 820 } 821 822 /* Remove trailing slashes. */ 823 while (len > 0 && IS_DIR_SEPARATOR (filename[len - 1])) 824 filename[--len] = 0; 825 826 strcat (filename + len, SLASH_STRING); 827 strcat (filename, string); 828 829 if (is_regular_file (filename)) 830 { 831 fd = open (filename, mode); 832 if (fd >= 0) 833 break; 834 } 835 } 836 837 done: 838 if (filename_opened) 839 { 840 /* If a file was opened, canonicalize its filename. Use xfullpath 841 rather than gdb_realpath to avoid resolving the basename part 842 of filenames when the associated file is a symbolic link. This 843 fixes a potential inconsistency between the filenames known to 844 GDB and the filenames it prints in the annotations. */ 845 if (fd < 0) 846 *filename_opened = NULL; 847 else if (IS_ABSOLUTE_PATH (filename)) 848 *filename_opened = xfullpath (filename); 849 else 850 { 851 /* Beware the // my son, the Emacs barfs, the botch that catch... */ 852 853 char *f = concat (current_directory, 854 IS_DIR_SEPARATOR (current_directory[strlen (current_directory) - 1]) 855 ? "" : SLASH_STRING, 856 filename, (char *)NULL); 857 858 *filename_opened = xfullpath (f); 859 xfree (f); 860 } 861 } 862 863 return fd; 864 } 865 866 867 /* This is essentially a convenience, for clients that want the behaviour 868 of openp, using source_path, but that really don't want the file to be 869 opened but want instead just to know what the full pathname is (as 870 qualified against source_path). 871 872 The current working directory is searched first. 873 874 If the file was found, this function returns 1, and FULL_PATHNAME is 875 set to the fully-qualified pathname. 876 877 Else, this functions returns 0, and FULL_PATHNAME is set to NULL. */ 878 int 879 source_full_path_of (const char *filename, char **full_pathname) 880 { 881 int fd; 882 883 fd = openp (source_path, OPF_TRY_CWD_FIRST | OPF_SEARCH_IN_PATH, filename, 884 O_RDONLY, full_pathname); 885 if (fd < 0) 886 { 887 *full_pathname = NULL; 888 return 0; 889 } 890 891 close (fd); 892 return 1; 893 } 894 895 /* Return non-zero if RULE matches PATH, that is if the rule can be 896 applied to PATH. */ 897 898 static int 899 substitute_path_rule_matches (const struct substitute_path_rule *rule, 900 const char *path) 901 { 902 const int from_len = strlen (rule->from); 903 const int path_len = strlen (path); 904 char *path_start; 905 906 if (path_len < from_len) 907 return 0; 908 909 /* The substitution rules are anchored at the start of the path, 910 so the path should start with rule->from. There is no filename 911 comparison routine, so we need to extract the first FROM_LEN 912 characters from PATH first and use that to do the comparison. */ 913 914 path_start = alloca (from_len + 1); 915 strncpy (path_start, path, from_len); 916 path_start[from_len] = '\0'; 917 918 if (FILENAME_CMP (path_start, rule->from) != 0) 919 return 0; 920 921 /* Make sure that the region in the path that matches the substitution 922 rule is immediately followed by a directory separator (or the end of 923 string character). */ 924 925 if (path[from_len] != '\0' && !IS_DIR_SEPARATOR (path[from_len])) 926 return 0; 927 928 return 1; 929 } 930 931 /* Find the substitute-path rule that applies to PATH and return it. 932 Return NULL if no rule applies. */ 933 934 static struct substitute_path_rule * 935 get_substitute_path_rule (const char *path) 936 { 937 struct substitute_path_rule *rule = substitute_path_rules; 938 939 while (rule != NULL && !substitute_path_rule_matches (rule, path)) 940 rule = rule->next; 941 942 return rule; 943 } 944 945 /* If the user specified a source path substitution rule that applies 946 to PATH, then apply it and return the new path. This new path must 947 be deallocated afterwards. 948 949 Return NULL if no substitution rule was specified by the user, 950 or if no rule applied to the given PATH. */ 951 952 static char * 953 rewrite_source_path (const char *path) 954 { 955 const struct substitute_path_rule *rule = get_substitute_path_rule (path); 956 char *new_path; 957 int from_len; 958 959 if (rule == NULL) 960 return NULL; 961 962 from_len = strlen (rule->from); 963 964 /* Compute the rewritten path and return it. */ 965 966 new_path = 967 (char *) xmalloc (strlen (path) + 1 + strlen (rule->to) - from_len); 968 strcpy (new_path, rule->to); 969 strcat (new_path, path + from_len); 970 971 return new_path; 972 } 973 974 /* This function is capable of finding the absolute path to a 975 source file, and opening it, provided you give it a FILENAME. Both the 976 DIRNAME and FULLNAME are only added suggestions on where to find the file. 977 978 FILENAME should be the filename to open. 979 DIRNAME is the compilation directory of a particular source file. 980 Only some debug formats provide this info. 981 FULLNAME can be the last known absolute path to the file in question. 982 Space for the path must have been malloc'd. If a path substitution 983 is applied we free the old value and set a new one. 984 985 On Success 986 A valid file descriptor is returned (the return value is positive). 987 FULLNAME is set to the absolute path to the file just opened. 988 The caller is responsible for freeing FULLNAME. 989 990 On Failure 991 An invalid file descriptor is returned (the return value is negative). 992 FULLNAME is set to NULL. */ 993 994 int 995 find_and_open_source (const char *filename, 996 const char *dirname, 997 char **fullname) 998 { 999 char *path = source_path; 1000 const char *p; 1001 int result; 1002 1003 /* Quick way out if we already know its full name. */ 1004 1005 if (*fullname) 1006 { 1007 /* The user may have requested that source paths be rewritten 1008 according to substitution rules he provided. If a substitution 1009 rule applies to this path, then apply it. */ 1010 char *rewritten_fullname = rewrite_source_path (*fullname); 1011 1012 if (rewritten_fullname != NULL) 1013 { 1014 xfree (*fullname); 1015 *fullname = rewritten_fullname; 1016 } 1017 1018 result = open (*fullname, OPEN_MODE); 1019 if (result >= 0) 1020 return result; 1021 /* Didn't work -- free old one, try again. */ 1022 xfree (*fullname); 1023 *fullname = NULL; 1024 } 1025 1026 if (dirname != NULL) 1027 { 1028 /* If necessary, rewrite the compilation directory name according 1029 to the source path substitution rules specified by the user. */ 1030 1031 char *rewritten_dirname = rewrite_source_path (dirname); 1032 1033 if (rewritten_dirname != NULL) 1034 { 1035 make_cleanup (xfree, rewritten_dirname); 1036 dirname = rewritten_dirname; 1037 } 1038 1039 /* Replace a path entry of $cdir with the compilation directory 1040 name. */ 1041 #define cdir_len 5 1042 /* We cast strstr's result in case an ANSIhole has made it const, 1043 which produces a "required warning" when assigned to a nonconst. */ 1044 p = (char *) strstr (source_path, "$cdir"); 1045 if (p && (p == path || p[-1] == DIRNAME_SEPARATOR) 1046 && (p[cdir_len] == DIRNAME_SEPARATOR || p[cdir_len] == '\0')) 1047 { 1048 int len; 1049 1050 path = (char *) 1051 alloca (strlen (source_path) + 1 + strlen (dirname) + 1); 1052 len = p - source_path; 1053 strncpy (path, source_path, len); /* Before $cdir */ 1054 strcpy (path + len, dirname); /* new stuff */ 1055 strcat (path + len, source_path + len + cdir_len); /* After 1056 $cdir */ 1057 } 1058 } 1059 1060 if (IS_ABSOLUTE_PATH (filename)) 1061 { 1062 /* If filename is absolute path, try the source path 1063 substitution on it. */ 1064 char *rewritten_filename = rewrite_source_path (filename); 1065 1066 if (rewritten_filename != NULL) 1067 { 1068 make_cleanup (xfree, rewritten_filename); 1069 filename = rewritten_filename; 1070 } 1071 } 1072 1073 result = openp (path, OPF_SEARCH_IN_PATH, filename, OPEN_MODE, fullname); 1074 if (result < 0) 1075 { 1076 /* Didn't work. Try using just the basename. */ 1077 p = lbasename (filename); 1078 if (p != filename) 1079 result = openp (path, OPF_SEARCH_IN_PATH, p, OPEN_MODE, fullname); 1080 } 1081 1082 return result; 1083 } 1084 1085 /* Open a source file given a symtab S. Returns a file descriptor or 1086 negative number for error. 1087 1088 This function is a convience function to find_and_open_source. */ 1089 1090 int 1091 open_source_file (struct symtab *s) 1092 { 1093 if (!s) 1094 return -1; 1095 1096 return find_and_open_source (s->filename, s->dirname, &s->fullname); 1097 } 1098 1099 /* Finds the fullname that a symtab represents. 1100 1101 If this functions finds the fullname, it will save it in s->fullname 1102 and it will also return the value. 1103 1104 If this function fails to find the file that this symtab represents, 1105 NULL will be returned and s->fullname will be set to NULL. */ 1106 1107 char * 1108 symtab_to_fullname (struct symtab *s) 1109 { 1110 int r; 1111 1112 if (!s) 1113 return NULL; 1114 1115 /* Use cached copy if we have it. 1116 We rely on forget_cached_source_info being called appropriately 1117 to handle cases like the file being moved. */ 1118 if (s->fullname) 1119 return s->fullname; 1120 1121 r = find_and_open_source (s->filename, s->dirname, &s->fullname); 1122 1123 if (r >= 0) 1124 { 1125 close (r); 1126 return s->fullname; 1127 } 1128 1129 return NULL; 1130 } 1131 1132 /* Create and initialize the table S->line_charpos that records 1133 the positions of the lines in the source file, which is assumed 1134 to be open on descriptor DESC. 1135 All set S->nlines to the number of such lines. */ 1136 1137 void 1138 find_source_lines (struct symtab *s, int desc) 1139 { 1140 struct stat st; 1141 char *data, *p, *end; 1142 int nlines = 0; 1143 int lines_allocated = 1000; 1144 int *line_charpos; 1145 long mtime = 0; 1146 int size; 1147 1148 gdb_assert (s); 1149 line_charpos = (int *) xmalloc (lines_allocated * sizeof (int)); 1150 if (fstat (desc, &st) < 0) 1151 perror_with_name (s->filename); 1152 1153 if (s->objfile && s->objfile->obfd) 1154 mtime = s->objfile->mtime; 1155 else if (exec_bfd) 1156 mtime = exec_bfd_mtime; 1157 1158 if (mtime && mtime < st.st_mtime) 1159 warning (_("Source file is more recent than executable.")); 1160 1161 { 1162 struct cleanup *old_cleanups; 1163 1164 /* st_size might be a large type, but we only support source files whose 1165 size fits in an int. */ 1166 size = (int) st.st_size; 1167 1168 /* Use malloc, not alloca, because this may be pretty large, and we may 1169 run into various kinds of limits on stack size. */ 1170 data = (char *) xmalloc (size); 1171 old_cleanups = make_cleanup (xfree, data); 1172 1173 /* Reassign `size' to result of read for systems where \r\n -> \n. */ 1174 size = myread (desc, data, size); 1175 if (size < 0) 1176 perror_with_name (s->filename); 1177 end = data + size; 1178 p = data; 1179 line_charpos[0] = 0; 1180 nlines = 1; 1181 while (p != end) 1182 { 1183 if (*p++ == '\n' 1184 /* A newline at the end does not start a new line. */ 1185 && p != end) 1186 { 1187 if (nlines == lines_allocated) 1188 { 1189 lines_allocated *= 2; 1190 line_charpos = 1191 (int *) xrealloc ((char *) line_charpos, 1192 sizeof (int) * lines_allocated); 1193 } 1194 line_charpos[nlines++] = p - data; 1195 } 1196 } 1197 do_cleanups (old_cleanups); 1198 } 1199 1200 s->nlines = nlines; 1201 s->line_charpos = 1202 (int *) xrealloc ((char *) line_charpos, nlines * sizeof (int)); 1203 1204 } 1205 1206 1207 1208 /* Get full pathname and line number positions for a symtab. 1209 Return nonzero if line numbers may have changed. 1210 Set *FULLNAME to actual name of the file as found by `openp', 1211 or to 0 if the file is not found. */ 1212 1213 static int 1214 get_filename_and_charpos (struct symtab *s, char **fullname) 1215 { 1216 int desc, linenums_changed = 0; 1217 struct cleanup *cleanups; 1218 1219 desc = open_source_file (s); 1220 if (desc < 0) 1221 { 1222 if (fullname) 1223 *fullname = NULL; 1224 return 0; 1225 } 1226 cleanups = make_cleanup_close (desc); 1227 if (fullname) 1228 *fullname = s->fullname; 1229 if (s->line_charpos == 0) 1230 linenums_changed = 1; 1231 if (linenums_changed) 1232 find_source_lines (s, desc); 1233 do_cleanups (cleanups); 1234 return linenums_changed; 1235 } 1236 1237 /* Print text describing the full name of the source file S 1238 and the line number LINE and its corresponding character position. 1239 The text starts with two Ctrl-z so that the Emacs-GDB interface 1240 can easily find it. 1241 1242 MID_STATEMENT is nonzero if the PC is not at the beginning of that line. 1243 1244 Return 1 if successful, 0 if could not find the file. */ 1245 1246 int 1247 identify_source_line (struct symtab *s, int line, int mid_statement, 1248 CORE_ADDR pc) 1249 { 1250 if (s->line_charpos == 0) 1251 get_filename_and_charpos (s, (char **) NULL); 1252 if (s->fullname == 0) 1253 return 0; 1254 if (line > s->nlines) 1255 /* Don't index off the end of the line_charpos array. */ 1256 return 0; 1257 annotate_source (s->fullname, line, s->line_charpos[line - 1], 1258 mid_statement, get_objfile_arch (s->objfile), pc); 1259 1260 current_source_line = line; 1261 first_line_listed = line; 1262 last_line_listed = line; 1263 current_source_symtab = s; 1264 return 1; 1265 } 1266 1267 1268 /* Print source lines from the file of symtab S, 1269 starting with line number LINE and stopping before line number STOPLINE. */ 1270 1271 static void print_source_lines_base (struct symtab *s, int line, int stopline, 1272 int noerror); 1273 static void 1274 print_source_lines_base (struct symtab *s, int line, int stopline, int noerror) 1275 { 1276 int c; 1277 int desc; 1278 int noprint = 0; 1279 FILE *stream; 1280 int nlines = stopline - line; 1281 struct cleanup *cleanup; 1282 struct ui_out *uiout = current_uiout; 1283 1284 /* Regardless of whether we can open the file, set current_source_symtab. */ 1285 current_source_symtab = s; 1286 current_source_line = line; 1287 first_line_listed = line; 1288 1289 /* If printing of source lines is disabled, just print file and line 1290 number. */ 1291 if (ui_out_test_flags (uiout, ui_source_list)) 1292 { 1293 /* Only prints "No such file or directory" once. */ 1294 if ((s != last_source_visited) || (!last_source_error)) 1295 { 1296 last_source_visited = s; 1297 desc = open_source_file (s); 1298 } 1299 else 1300 { 1301 desc = last_source_error; 1302 noerror = 1; 1303 } 1304 } 1305 else 1306 { 1307 desc = last_source_error; 1308 noerror = 1; 1309 noprint = 1; 1310 } 1311 1312 if (desc < 0 || noprint) 1313 { 1314 last_source_error = desc; 1315 1316 if (!noerror) 1317 { 1318 char *name = alloca (strlen (s->filename) + 100); 1319 sprintf (name, "%d\t%s", line, s->filename); 1320 print_sys_errmsg (name, errno); 1321 } 1322 else 1323 { 1324 ui_out_field_int (uiout, "line", line); 1325 ui_out_text (uiout, "\tin "); 1326 ui_out_field_string (uiout, "file", s->filename); 1327 ui_out_text (uiout, "\n"); 1328 } 1329 1330 return; 1331 } 1332 1333 last_source_error = 0; 1334 1335 if (s->line_charpos == 0) 1336 find_source_lines (s, desc); 1337 1338 if (line < 1 || line > s->nlines) 1339 { 1340 close (desc); 1341 error (_("Line number %d out of range; %s has %d lines."), 1342 line, s->filename, s->nlines); 1343 } 1344 1345 if (lseek (desc, s->line_charpos[line - 1], 0) < 0) 1346 { 1347 close (desc); 1348 perror_with_name (s->filename); 1349 } 1350 1351 stream = fdopen (desc, FDOPEN_MODE); 1352 clearerr (stream); 1353 cleanup = make_cleanup_fclose (stream); 1354 1355 while (nlines-- > 0) 1356 { 1357 char buf[20]; 1358 1359 c = fgetc (stream); 1360 if (c == EOF) 1361 break; 1362 last_line_listed = current_source_line; 1363 sprintf (buf, "%d\t", current_source_line++); 1364 ui_out_text (uiout, buf); 1365 do 1366 { 1367 if (c < 040 && c != '\t' && c != '\n' && c != '\r') 1368 { 1369 sprintf (buf, "^%c", c + 0100); 1370 ui_out_text (uiout, buf); 1371 } 1372 else if (c == 0177) 1373 ui_out_text (uiout, "^?"); 1374 else if (c == '\r') 1375 { 1376 /* Skip a \r character, but only before a \n. */ 1377 int c1 = fgetc (stream); 1378 1379 if (c1 != '\n') 1380 printf_filtered ("^%c", c + 0100); 1381 if (c1 != EOF) 1382 ungetc (c1, stream); 1383 } 1384 else 1385 { 1386 sprintf (buf, "%c", c); 1387 ui_out_text (uiout, buf); 1388 } 1389 } 1390 while (c != '\n' && (c = fgetc (stream)) >= 0); 1391 } 1392 1393 do_cleanups (cleanup); 1394 } 1395 1396 /* Show source lines from the file of symtab S, starting with line 1397 number LINE and stopping before line number STOPLINE. If this is 1398 not the command line version, then the source is shown in the source 1399 window otherwise it is simply printed. */ 1400 1401 void 1402 print_source_lines (struct symtab *s, int line, int stopline, int noerror) 1403 { 1404 print_source_lines_base (s, line, stopline, noerror); 1405 } 1406 1407 /* Print info on range of pc's in a specified line. */ 1408 1409 static void 1410 line_info (char *arg, int from_tty) 1411 { 1412 struct symtabs_and_lines sals; 1413 struct symtab_and_line sal; 1414 CORE_ADDR start_pc, end_pc; 1415 int i; 1416 struct cleanup *cleanups; 1417 1418 init_sal (&sal); /* initialize to zeroes */ 1419 1420 if (arg == 0) 1421 { 1422 sal.symtab = current_source_symtab; 1423 sal.pspace = current_program_space; 1424 sal.line = last_line_listed; 1425 sals.nelts = 1; 1426 sals.sals = (struct symtab_and_line *) 1427 xmalloc (sizeof (struct symtab_and_line)); 1428 sals.sals[0] = sal; 1429 } 1430 else 1431 { 1432 sals = decode_line_spec_1 (arg, DECODE_LINE_LIST_MODE); 1433 1434 dont_repeat (); 1435 } 1436 1437 cleanups = make_cleanup (xfree, sals.sals); 1438 1439 /* C++ More than one line may have been specified, as when the user 1440 specifies an overloaded function name. Print info on them all. */ 1441 for (i = 0; i < sals.nelts; i++) 1442 { 1443 sal = sals.sals[i]; 1444 if (sal.pspace != current_program_space) 1445 continue; 1446 1447 if (sal.symtab == 0) 1448 { 1449 struct gdbarch *gdbarch = get_current_arch (); 1450 1451 printf_filtered (_("No line number information available")); 1452 if (sal.pc != 0) 1453 { 1454 /* This is useful for "info line *0x7f34". If we can't tell the 1455 user about a source line, at least let them have the symbolic 1456 address. */ 1457 printf_filtered (" for address "); 1458 wrap_here (" "); 1459 print_address (gdbarch, sal.pc, gdb_stdout); 1460 } 1461 else 1462 printf_filtered ("."); 1463 printf_filtered ("\n"); 1464 } 1465 else if (sal.line > 0 1466 && find_line_pc_range (sal, &start_pc, &end_pc)) 1467 { 1468 struct gdbarch *gdbarch = get_objfile_arch (sal.symtab->objfile); 1469 1470 if (start_pc == end_pc) 1471 { 1472 printf_filtered ("Line %d of \"%s\"", 1473 sal.line, sal.symtab->filename); 1474 wrap_here (" "); 1475 printf_filtered (" is at address "); 1476 print_address (gdbarch, start_pc, gdb_stdout); 1477 wrap_here (" "); 1478 printf_filtered (" but contains no code.\n"); 1479 } 1480 else 1481 { 1482 printf_filtered ("Line %d of \"%s\"", 1483 sal.line, sal.symtab->filename); 1484 wrap_here (" "); 1485 printf_filtered (" starts at address "); 1486 print_address (gdbarch, start_pc, gdb_stdout); 1487 wrap_here (" "); 1488 printf_filtered (" and ends at "); 1489 print_address (gdbarch, end_pc, gdb_stdout); 1490 printf_filtered (".\n"); 1491 } 1492 1493 /* x/i should display this line's code. */ 1494 set_next_address (gdbarch, start_pc); 1495 1496 /* Repeating "info line" should do the following line. */ 1497 last_line_listed = sal.line + 1; 1498 1499 /* If this is the only line, show the source code. If it could 1500 not find the file, don't do anything special. */ 1501 if (annotation_level && sals.nelts == 1) 1502 identify_source_line (sal.symtab, sal.line, 0, start_pc); 1503 } 1504 else 1505 /* Is there any case in which we get here, and have an address 1506 which the user would want to see? If we have debugging symbols 1507 and no line numbers? */ 1508 printf_filtered (_("Line number %d is out of range for \"%s\".\n"), 1509 sal.line, sal.symtab->filename); 1510 } 1511 do_cleanups (cleanups); 1512 } 1513 1514 /* Commands to search the source file for a regexp. */ 1515 1516 static void 1517 forward_search_command (char *regex, int from_tty) 1518 { 1519 int c; 1520 int desc; 1521 FILE *stream; 1522 int line; 1523 char *msg; 1524 struct cleanup *cleanups; 1525 1526 line = last_line_listed + 1; 1527 1528 msg = (char *) re_comp (regex); 1529 if (msg) 1530 error (("%s"), msg); 1531 1532 if (current_source_symtab == 0) 1533 select_source_symtab (0); 1534 1535 desc = open_source_file (current_source_symtab); 1536 if (desc < 0) 1537 perror_with_name (current_source_symtab->filename); 1538 cleanups = make_cleanup_close (desc); 1539 1540 if (current_source_symtab->line_charpos == 0) 1541 find_source_lines (current_source_symtab, desc); 1542 1543 if (line < 1 || line > current_source_symtab->nlines) 1544 error (_("Expression not found")); 1545 1546 if (lseek (desc, current_source_symtab->line_charpos[line - 1], 0) < 0) 1547 perror_with_name (current_source_symtab->filename); 1548 1549 discard_cleanups (cleanups); 1550 stream = fdopen (desc, FDOPEN_MODE); 1551 clearerr (stream); 1552 cleanups = make_cleanup_fclose (stream); 1553 while (1) 1554 { 1555 static char *buf = NULL; 1556 char *p; 1557 int cursize, newsize; 1558 1559 cursize = 256; 1560 buf = xmalloc (cursize); 1561 p = buf; 1562 1563 c = getc (stream); 1564 if (c == EOF) 1565 break; 1566 do 1567 { 1568 *p++ = c; 1569 if (p - buf == cursize) 1570 { 1571 newsize = cursize + cursize / 2; 1572 buf = xrealloc (buf, newsize); 1573 p = buf + cursize; 1574 cursize = newsize; 1575 } 1576 } 1577 while (c != '\n' && (c = getc (stream)) >= 0); 1578 1579 /* Remove the \r, if any, at the end of the line, otherwise 1580 regular expressions that end with $ or \n won't work. */ 1581 if (p - buf > 1 && p[-2] == '\r') 1582 { 1583 p--; 1584 p[-1] = '\n'; 1585 } 1586 1587 /* We now have a source line in buf, null terminate and match. */ 1588 *p = 0; 1589 if (re_exec (buf) > 0) 1590 { 1591 /* Match! */ 1592 do_cleanups (cleanups); 1593 print_source_lines (current_source_symtab, line, line + 1, 0); 1594 set_internalvar_integer (lookup_internalvar ("_"), line); 1595 current_source_line = max (line - lines_to_list / 2, 1); 1596 return; 1597 } 1598 line++; 1599 } 1600 1601 printf_filtered (_("Expression not found\n")); 1602 do_cleanups (cleanups); 1603 } 1604 1605 static void 1606 reverse_search_command (char *regex, int from_tty) 1607 { 1608 int c; 1609 int desc; 1610 FILE *stream; 1611 int line; 1612 char *msg; 1613 struct cleanup *cleanups; 1614 1615 line = last_line_listed - 1; 1616 1617 msg = (char *) re_comp (regex); 1618 if (msg) 1619 error (("%s"), msg); 1620 1621 if (current_source_symtab == 0) 1622 select_source_symtab (0); 1623 1624 desc = open_source_file (current_source_symtab); 1625 if (desc < 0) 1626 perror_with_name (current_source_symtab->filename); 1627 cleanups = make_cleanup_close (desc); 1628 1629 if (current_source_symtab->line_charpos == 0) 1630 find_source_lines (current_source_symtab, desc); 1631 1632 if (line < 1 || line > current_source_symtab->nlines) 1633 error (_("Expression not found")); 1634 1635 if (lseek (desc, current_source_symtab->line_charpos[line - 1], 0) < 0) 1636 perror_with_name (current_source_symtab->filename); 1637 1638 discard_cleanups (cleanups); 1639 stream = fdopen (desc, FDOPEN_MODE); 1640 clearerr (stream); 1641 cleanups = make_cleanup_fclose (stream); 1642 while (line > 1) 1643 { 1644 /* FIXME!!! We walk right off the end of buf if we get a long line!!! */ 1645 char buf[4096]; /* Should be reasonable??? */ 1646 char *p = buf; 1647 1648 c = getc (stream); 1649 if (c == EOF) 1650 break; 1651 do 1652 { 1653 *p++ = c; 1654 } 1655 while (c != '\n' && (c = getc (stream)) >= 0); 1656 1657 /* Remove the \r, if any, at the end of the line, otherwise 1658 regular expressions that end with $ or \n won't work. */ 1659 if (p - buf > 1 && p[-2] == '\r') 1660 { 1661 p--; 1662 p[-1] = '\n'; 1663 } 1664 1665 /* We now have a source line in buf; null terminate and match. */ 1666 *p = 0; 1667 if (re_exec (buf) > 0) 1668 { 1669 /* Match! */ 1670 do_cleanups (cleanups); 1671 print_source_lines (current_source_symtab, line, line + 1, 0); 1672 set_internalvar_integer (lookup_internalvar ("_"), line); 1673 current_source_line = max (line - lines_to_list / 2, 1); 1674 return; 1675 } 1676 line--; 1677 if (fseek (stream, current_source_symtab->line_charpos[line - 1], 0) < 0) 1678 { 1679 do_cleanups (cleanups); 1680 perror_with_name (current_source_symtab->filename); 1681 } 1682 } 1683 1684 printf_filtered (_("Expression not found\n")); 1685 do_cleanups (cleanups); 1686 return; 1687 } 1688 1689 /* If the last character of PATH is a directory separator, then strip it. */ 1690 1691 static void 1692 strip_trailing_directory_separator (char *path) 1693 { 1694 const int last = strlen (path) - 1; 1695 1696 if (last < 0) 1697 return; /* No stripping is needed if PATH is the empty string. */ 1698 1699 if (IS_DIR_SEPARATOR (path[last])) 1700 path[last] = '\0'; 1701 } 1702 1703 /* Return the path substitution rule that matches FROM. 1704 Return NULL if no rule matches. */ 1705 1706 static struct substitute_path_rule * 1707 find_substitute_path_rule (const char *from) 1708 { 1709 struct substitute_path_rule *rule = substitute_path_rules; 1710 1711 while (rule != NULL) 1712 { 1713 if (FILENAME_CMP (rule->from, from) == 0) 1714 return rule; 1715 rule = rule->next; 1716 } 1717 1718 return NULL; 1719 } 1720 1721 /* Add a new substitute-path rule at the end of the current list of rules. 1722 The new rule will replace FROM into TO. */ 1723 1724 void 1725 add_substitute_path_rule (char *from, char *to) 1726 { 1727 struct substitute_path_rule *rule; 1728 struct substitute_path_rule *new_rule; 1729 1730 new_rule = xmalloc (sizeof (struct substitute_path_rule)); 1731 new_rule->from = xstrdup (from); 1732 new_rule->to = xstrdup (to); 1733 new_rule->next = NULL; 1734 1735 /* If the list of rules are empty, then insert the new rule 1736 at the head of the list. */ 1737 1738 if (substitute_path_rules == NULL) 1739 { 1740 substitute_path_rules = new_rule; 1741 return; 1742 } 1743 1744 /* Otherwise, skip to the last rule in our list and then append 1745 the new rule. */ 1746 1747 rule = substitute_path_rules; 1748 while (rule->next != NULL) 1749 rule = rule->next; 1750 1751 rule->next = new_rule; 1752 } 1753 1754 /* Remove the given source path substitution rule from the current list 1755 of rules. The memory allocated for that rule is also deallocated. */ 1756 1757 static void 1758 delete_substitute_path_rule (struct substitute_path_rule *rule) 1759 { 1760 if (rule == substitute_path_rules) 1761 substitute_path_rules = rule->next; 1762 else 1763 { 1764 struct substitute_path_rule *prev = substitute_path_rules; 1765 1766 while (prev != NULL && prev->next != rule) 1767 prev = prev->next; 1768 1769 gdb_assert (prev != NULL); 1770 1771 prev->next = rule->next; 1772 } 1773 1774 xfree (rule->from); 1775 xfree (rule->to); 1776 xfree (rule); 1777 } 1778 1779 /* Implement the "show substitute-path" command. */ 1780 1781 static void 1782 show_substitute_path_command (char *args, int from_tty) 1783 { 1784 struct substitute_path_rule *rule = substitute_path_rules; 1785 char **argv; 1786 char *from = NULL; 1787 1788 argv = gdb_buildargv (args); 1789 make_cleanup_freeargv (argv); 1790 1791 /* We expect zero or one argument. */ 1792 1793 if (argv != NULL && argv[0] != NULL && argv[1] != NULL) 1794 error (_("Too many arguments in command")); 1795 1796 if (argv != NULL && argv[0] != NULL) 1797 from = argv[0]; 1798 1799 /* Print the substitution rules. */ 1800 1801 if (from != NULL) 1802 printf_filtered 1803 (_("Source path substitution rule matching `%s':\n"), from); 1804 else 1805 printf_filtered (_("List of all source path substitution rules:\n")); 1806 1807 while (rule != NULL) 1808 { 1809 if (from == NULL || FILENAME_CMP (rule->from, from) == 0) 1810 printf_filtered (" `%s' -> `%s'.\n", rule->from, rule->to); 1811 rule = rule->next; 1812 } 1813 } 1814 1815 /* Implement the "unset substitute-path" command. */ 1816 1817 static void 1818 unset_substitute_path_command (char *args, int from_tty) 1819 { 1820 struct substitute_path_rule *rule = substitute_path_rules; 1821 char **argv = gdb_buildargv (args); 1822 char *from = NULL; 1823 int rule_found = 0; 1824 1825 /* This function takes either 0 or 1 argument. */ 1826 1827 make_cleanup_freeargv (argv); 1828 if (argv != NULL && argv[0] != NULL && argv[1] != NULL) 1829 error (_("Incorrect usage, too many arguments in command")); 1830 1831 if (argv != NULL && argv[0] != NULL) 1832 from = argv[0]; 1833 1834 /* If the user asked for all the rules to be deleted, ask him 1835 to confirm and give him a chance to abort before the action 1836 is performed. */ 1837 1838 if (from == NULL 1839 && !query (_("Delete all source path substitution rules? "))) 1840 error (_("Canceled")); 1841 1842 /* Delete the rule matching the argument. No argument means that 1843 all rules should be deleted. */ 1844 1845 while (rule != NULL) 1846 { 1847 struct substitute_path_rule *next = rule->next; 1848 1849 if (from == NULL || FILENAME_CMP (from, rule->from) == 0) 1850 { 1851 delete_substitute_path_rule (rule); 1852 rule_found = 1; 1853 } 1854 1855 rule = next; 1856 } 1857 1858 /* If the user asked for a specific rule to be deleted but 1859 we could not find it, then report an error. */ 1860 1861 if (from != NULL && !rule_found) 1862 error (_("No substitution rule defined for `%s'"), from); 1863 1864 forget_cached_source_info (); 1865 } 1866 1867 /* Add a new source path substitution rule. */ 1868 1869 static void 1870 set_substitute_path_command (char *args, int from_tty) 1871 { 1872 char **argv; 1873 struct substitute_path_rule *rule; 1874 1875 argv = gdb_buildargv (args); 1876 make_cleanup_freeargv (argv); 1877 1878 if (argv == NULL || argv[0] == NULL || argv [1] == NULL) 1879 error (_("Incorrect usage, too few arguments in command")); 1880 1881 if (argv[2] != NULL) 1882 error (_("Incorrect usage, too many arguments in command")); 1883 1884 if (*(argv[0]) == '\0') 1885 error (_("First argument must be at least one character long")); 1886 1887 /* Strip any trailing directory separator character in either FROM 1888 or TO. The substitution rule already implicitly contains them. */ 1889 strip_trailing_directory_separator (argv[0]); 1890 strip_trailing_directory_separator (argv[1]); 1891 1892 /* If a rule with the same "from" was previously defined, then 1893 delete it. This new rule replaces it. */ 1894 1895 rule = find_substitute_path_rule (argv[0]); 1896 if (rule != NULL) 1897 delete_substitute_path_rule (rule); 1898 1899 /* Insert the new substitution rule. */ 1900 1901 add_substitute_path_rule (argv[0], argv[1]); 1902 forget_cached_source_info (); 1903 } 1904 1905 1906 void 1907 _initialize_source (void) 1908 { 1909 struct cmd_list_element *c; 1910 1911 current_source_symtab = 0; 1912 init_source_path (); 1913 1914 /* The intention is to use POSIX Basic Regular Expressions. 1915 Always use the GNU regex routine for consistency across all hosts. 1916 Our current GNU regex.c does not have all the POSIX features, so this is 1917 just an approximation. */ 1918 re_set_syntax (RE_SYNTAX_GREP); 1919 1920 c = add_cmd ("directory", class_files, directory_command, _("\ 1921 Add directory DIR to beginning of search path for source files.\n\ 1922 Forget cached info on source file locations and line positions.\n\ 1923 DIR can also be $cwd for the current working directory, or $cdir for the\n\ 1924 directory in which the source file was compiled into object code.\n\ 1925 With no argument, reset the search path to $cdir:$cwd, the default."), 1926 &cmdlist); 1927 1928 if (dbx_commands) 1929 add_com_alias ("use", "directory", class_files, 0); 1930 1931 set_cmd_completer (c, filename_completer); 1932 1933 add_setshow_optional_filename_cmd ("directories", 1934 class_files, 1935 &source_path, 1936 _("\ 1937 Set the search path for finding source files."), 1938 _("\ 1939 Show the search path for finding source files."), 1940 _("\ 1941 $cwd in the path means the current working directory.\n\ 1942 $cdir in the path means the compilation directory of the source file.\n\ 1943 GDB ensures the search path always ends with $cdir:$cwd by\n\ 1944 appending these directories if necessary.\n\ 1945 Setting the value to an empty string sets it to $cdir:$cwd, the default."), 1946 set_directories_command, 1947 show_directories_command, 1948 &setlist, &showlist); 1949 1950 if (xdb_commands) 1951 { 1952 add_com_alias ("D", "directory", class_files, 0); 1953 add_cmd ("ld", no_class, show_directories_1, _("\ 1954 Current search path for finding source files.\n\ 1955 $cwd in the path means the current working directory.\n\ 1956 $cdir in the path means the compilation directory of the source file."), 1957 &cmdlist); 1958 } 1959 1960 add_info ("source", source_info, 1961 _("Information about the current source file.")); 1962 1963 add_info ("line", line_info, _("\ 1964 Core addresses of the code for a source line.\n\ 1965 Line can be specified as\n\ 1966 LINENUM, to list around that line in current file,\n\ 1967 FILE:LINENUM, to list around that line in that file,\n\ 1968 FUNCTION, to list around beginning of that function,\n\ 1969 FILE:FUNCTION, to distinguish among like-named static functions.\n\ 1970 Default is to describe the last source line that was listed.\n\n\ 1971 This sets the default address for \"x\" to the line's first instruction\n\ 1972 so that \"x/i\" suffices to start examining the machine code.\n\ 1973 The address is also stored as the value of \"$_\".")); 1974 1975 add_com ("forward-search", class_files, forward_search_command, _("\ 1976 Search for regular expression (see regex(3)) from last line listed.\n\ 1977 The matching line number is also stored as the value of \"$_\".")); 1978 add_com_alias ("search", "forward-search", class_files, 0); 1979 1980 add_com ("reverse-search", class_files, reverse_search_command, _("\ 1981 Search backward for regular expression (see regex(3)) from last line listed.\n\ 1982 The matching line number is also stored as the value of \"$_\".")); 1983 add_com_alias ("rev", "reverse-search", class_files, 1); 1984 1985 if (xdb_commands) 1986 { 1987 add_com_alias ("/", "forward-search", class_files, 0); 1988 add_com_alias ("?", "reverse-search", class_files, 0); 1989 } 1990 1991 add_setshow_integer_cmd ("listsize", class_support, &lines_to_list, _("\ 1992 Set number of source lines gdb will list by default."), _("\ 1993 Show number of source lines gdb will list by default."), NULL, 1994 NULL, 1995 show_lines_to_list, 1996 &setlist, &showlist); 1997 1998 add_cmd ("substitute-path", class_files, set_substitute_path_command, 1999 _("\ 2000 Usage: set substitute-path FROM TO\n\ 2001 Add a substitution rule replacing FROM into TO in source file names.\n\ 2002 If a substitution rule was previously set for FROM, the old rule\n\ 2003 is replaced by the new one."), 2004 &setlist); 2005 2006 add_cmd ("substitute-path", class_files, unset_substitute_path_command, 2007 _("\ 2008 Usage: unset substitute-path [FROM]\n\ 2009 Delete the rule for substituting FROM in source file names. If FROM\n\ 2010 is not specified, all substituting rules are deleted.\n\ 2011 If the debugger cannot find a rule for FROM, it will display a warning."), 2012 &unsetlist); 2013 2014 add_cmd ("substitute-path", class_files, show_substitute_path_command, 2015 _("\ 2016 Usage: show substitute-path [FROM]\n\ 2017 Print the rule for substituting FROM in source file names. If FROM\n\ 2018 is not specified, print all substitution rules."), 2019 &showlist); 2020 } 2021