1 /* List lines of source files for GDB, the GNU debugger. 2 Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 3 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 4 2009, 2010 Free Software Foundation, Inc. 5 6 This file is part of GDB. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 3 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 20 21 #include "defs.h" 22 #include "arch-utils.h" 23 #include "symtab.h" 24 #include "expression.h" 25 #include "language.h" 26 #include "command.h" 27 #include "source.h" 28 #include "gdbcmd.h" 29 #include "frame.h" 30 #include "value.h" 31 #include "gdb_assert.h" 32 33 #include <sys/types.h> 34 #include "gdb_string.h" 35 #include "gdb_stat.h" 36 #include <fcntl.h> 37 #include "gdbcore.h" 38 #include "gdb_regex.h" 39 #include "symfile.h" 40 #include "objfiles.h" 41 #include "annotate.h" 42 #include "gdbtypes.h" 43 #include "linespec.h" 44 #include "filenames.h" /* for DOSish file names */ 45 #include "completer.h" 46 #include "ui-out.h" 47 #include "readline/readline.h" 48 49 #include "psymtab.h" 50 51 52 #define OPEN_MODE (O_RDONLY | O_BINARY) 53 #define FDOPEN_MODE FOPEN_RB 54 55 /* Prototypes for exported functions. */ 56 57 void _initialize_source (void); 58 59 /* Prototypes for local functions. */ 60 61 static int get_filename_and_charpos (struct symtab *, char **); 62 63 static void reverse_search_command (char *, int); 64 65 static void forward_search_command (char *, int); 66 67 static void line_info (char *, int); 68 69 static void source_info (char *, int); 70 71 static void show_directories (char *, int); 72 73 /* Path of directories to search for source files. 74 Same format as the PATH environment variable's value. */ 75 76 char *source_path; 77 78 /* Support for source path substitution commands. */ 79 80 struct substitute_path_rule 81 { 82 char *from; 83 char *to; 84 struct substitute_path_rule *next; 85 }; 86 87 static struct substitute_path_rule *substitute_path_rules = NULL; 88 89 /* Symtab of default file for listing lines of. */ 90 91 static struct symtab *current_source_symtab; 92 93 /* Default next line to list. */ 94 95 static int current_source_line; 96 97 static struct program_space *current_source_pspace; 98 99 /* Default number of lines to print with commands like "list". 100 This is based on guessing how many long (i.e. more than chars_per_line 101 characters) lines there will be. To be completely correct, "list" 102 and friends should be rewritten to count characters and see where 103 things are wrapping, but that would be a fair amount of work. */ 104 105 int lines_to_list = 10; 106 static void 107 show_lines_to_list (struct ui_file *file, int from_tty, 108 struct cmd_list_element *c, const char *value) 109 { 110 fprintf_filtered (file, _("\ 111 Number of source lines gdb will list by default is %s.\n"), 112 value); 113 } 114 115 /* Line number of last line printed. Default for various commands. 116 current_source_line is usually, but not always, the same as this. */ 117 118 static int last_line_listed; 119 120 /* First line number listed by last listing command. */ 121 122 static int first_line_listed; 123 124 /* Saves the name of the last source file visited and a possible error code. 125 Used to prevent repeating annoying "No such file or directories" msgs */ 126 127 static struct symtab *last_source_visited = NULL; 128 static int last_source_error = 0; 129 130 /* Return the first line listed by print_source_lines. 131 Used by command interpreters to request listing from 132 a previous point. */ 133 134 int 135 get_first_line_listed (void) 136 { 137 return first_line_listed; 138 } 139 140 /* Return the default number of lines to print with commands like the 141 cli "list". The caller of print_source_lines must use this to 142 calculate the end line and use it in the call to print_source_lines 143 as it does not automatically use this value. */ 144 145 int 146 get_lines_to_list (void) 147 { 148 return lines_to_list; 149 } 150 151 /* Return the current source file for listing and next line to list. 152 NOTE: The returned sal pc and end fields are not valid. */ 153 154 struct symtab_and_line 155 get_current_source_symtab_and_line (void) 156 { 157 struct symtab_and_line cursal = { 0 }; 158 159 cursal.pspace = current_source_pspace; 160 cursal.symtab = current_source_symtab; 161 cursal.line = current_source_line; 162 cursal.pc = 0; 163 cursal.end = 0; 164 165 return cursal; 166 } 167 168 /* If the current source file for listing is not set, try and get a default. 169 Usually called before get_current_source_symtab_and_line() is called. 170 It may err out if a default cannot be determined. 171 We must be cautious about where it is called, as it can recurse as the 172 process of determining a new default may call the caller! 173 Use get_current_source_symtab_and_line only to get whatever 174 we have without erroring out or trying to get a default. */ 175 176 void 177 set_default_source_symtab_and_line (void) 178 { 179 if (!have_full_symbols () && !have_partial_symbols ()) 180 error (_("No symbol table is loaded. Use the \"file\" command.")); 181 182 /* Pull in a current source symtab if necessary */ 183 if (current_source_symtab == 0) 184 select_source_symtab (0); 185 } 186 187 /* Return the current default file for listing and next line to list 188 (the returned sal pc and end fields are not valid.) 189 and set the current default to whatever is in SAL. 190 NOTE: The returned sal pc and end fields are not valid. */ 191 192 struct symtab_and_line 193 set_current_source_symtab_and_line (const struct symtab_and_line *sal) 194 { 195 struct symtab_and_line cursal = { 0 }; 196 197 cursal.pspace = current_source_pspace; 198 cursal.symtab = current_source_symtab; 199 cursal.line = current_source_line; 200 cursal.pc = 0; 201 cursal.end = 0; 202 203 current_source_pspace = sal->pspace; 204 current_source_symtab = sal->symtab; 205 current_source_line = sal->line; 206 207 return cursal; 208 } 209 210 /* Reset any information stored about a default file and line to print. */ 211 212 void 213 clear_current_source_symtab_and_line (void) 214 { 215 current_source_symtab = 0; 216 current_source_line = 0; 217 } 218 219 /* Set the source file default for the "list" command to be S. 220 221 If S is NULL, and we don't have a default, find one. This 222 should only be called when the user actually tries to use the 223 default, since we produce an error if we can't find a reasonable 224 default. Also, since this can cause symbols to be read, doing it 225 before we need to would make things slower than necessary. */ 226 227 void 228 select_source_symtab (struct symtab *s) 229 { 230 struct symtabs_and_lines sals; 231 struct symtab_and_line sal; 232 struct objfile *ofp; 233 234 if (s) 235 { 236 current_source_symtab = s; 237 current_source_line = 1; 238 current_source_pspace = SYMTAB_PSPACE (s); 239 return; 240 } 241 242 if (current_source_symtab) 243 return; 244 245 /* Make the default place to list be the function `main' 246 if one exists. */ 247 if (lookup_symbol (main_name (), 0, VAR_DOMAIN, 0)) 248 { 249 sals = decode_line_spec (main_name (), 1); 250 sal = sals.sals[0]; 251 xfree (sals.sals); 252 current_source_pspace = sal.pspace; 253 current_source_symtab = sal.symtab; 254 current_source_line = max (sal.line - (lines_to_list - 1), 1); 255 if (current_source_symtab) 256 return; 257 } 258 259 /* Alright; find the last file in the symtab list (ignoring .h's 260 and namespace symtabs). */ 261 262 current_source_line = 1; 263 264 ALL_OBJFILES (ofp) 265 { 266 for (s = ofp->symtabs; s; s = s->next) 267 { 268 const char *name = s->filename; 269 int len = strlen (name); 270 271 if (!(len > 2 && (strcmp (&name[len - 2], ".h") == 0 272 || strcmp (name, "<<C++-namespaces>>") == 0))) 273 { 274 current_source_pspace = current_program_space; 275 current_source_symtab = s; 276 } 277 } 278 } 279 280 if (current_source_symtab) 281 return; 282 283 ALL_OBJFILES (ofp) 284 { 285 if (ofp->sf) 286 s = ofp->sf->qf->find_last_source_symtab (ofp); 287 if (s) 288 current_source_symtab = s; 289 } 290 if (current_source_symtab) 291 return; 292 293 error (_("Can't find a default source file")); 294 } 295 296 static void 297 show_directories (char *ignore, int from_tty) 298 { 299 puts_filtered ("Source directories searched: "); 300 puts_filtered (source_path); 301 puts_filtered ("\n"); 302 } 303 304 /* Forget what we learned about line positions in source files, and 305 which directories contain them; must check again now since files 306 may be found in a different directory now. */ 307 308 void 309 forget_cached_source_info (void) 310 { 311 struct program_space *pspace; 312 struct symtab *s; 313 struct objfile *objfile; 314 315 ALL_PSPACES (pspace) 316 ALL_PSPACE_OBJFILES (pspace, objfile) 317 { 318 for (s = objfile->symtabs; s != NULL; s = s->next) 319 { 320 if (s->line_charpos != NULL) 321 { 322 xfree (s->line_charpos); 323 s->line_charpos = NULL; 324 } 325 if (s->fullname != NULL) 326 { 327 xfree (s->fullname); 328 s->fullname = NULL; 329 } 330 } 331 332 if (objfile->sf) 333 objfile->sf->qf->forget_cached_source_info (objfile); 334 } 335 336 last_source_visited = NULL; 337 } 338 339 void 340 init_source_path (void) 341 { 342 char buf[20]; 343 344 sprintf (buf, "$cdir%c$cwd", DIRNAME_SEPARATOR); 345 source_path = xstrdup (buf); 346 forget_cached_source_info (); 347 } 348 349 /* Add zero or more directories to the front of the source path. */ 350 351 void 352 directory_command (char *dirname, int from_tty) 353 { 354 dont_repeat (); 355 /* FIXME, this goes to "delete dir"... */ 356 if (dirname == 0) 357 { 358 if (!from_tty || query (_("Reinitialize source path to empty? "))) 359 { 360 xfree (source_path); 361 init_source_path (); 362 } 363 } 364 else 365 { 366 mod_path (dirname, &source_path); 367 forget_cached_source_info (); 368 } 369 if (from_tty) 370 show_directories ((char *) 0, from_tty); 371 } 372 373 /* Add a path given with the -d command line switch. 374 This will not be quoted so we must not treat spaces as separators. */ 375 376 void 377 directory_switch (char *dirname, int from_tty) 378 { 379 add_path (dirname, &source_path, 0); 380 } 381 382 /* Add zero or more directories to the front of an arbitrary path. */ 383 384 void 385 mod_path (char *dirname, char **which_path) 386 { 387 add_path (dirname, which_path, 1); 388 } 389 390 /* Workhorse of mod_path. Takes an extra argument to determine 391 if dirname should be parsed for separators that indicate multiple 392 directories. This allows for interfaces that pre-parse the dirname 393 and allow specification of traditional separator characters such 394 as space or tab. */ 395 396 void 397 add_path (char *dirname, char **which_path, int parse_separators) 398 { 399 char *old = *which_path; 400 int prefix = 0; 401 char **argv = NULL; 402 char *arg; 403 int argv_index = 0; 404 405 if (dirname == 0) 406 return; 407 408 if (parse_separators) 409 { 410 /* This will properly parse the space and tab separators 411 and any quotes that may exist. DIRNAME_SEPARATOR will 412 be dealt with later. */ 413 argv = gdb_buildargv (dirname); 414 make_cleanup_freeargv (argv); 415 416 arg = argv[0]; 417 } 418 else 419 { 420 arg = xstrdup (dirname); 421 make_cleanup (xfree, arg); 422 } 423 424 do 425 { 426 char *name = arg; 427 char *p; 428 struct stat st; 429 430 { 431 char *separator = NULL; 432 433 /* Spaces and tabs will have been removed by buildargv(). 434 The directories will there be split into a list but 435 each entry may still contain DIRNAME_SEPARATOR. */ 436 if (parse_separators) 437 separator = strchr (name, DIRNAME_SEPARATOR); 438 439 if (separator == 0) 440 p = arg = name + strlen (name); 441 else 442 { 443 p = separator; 444 arg = p + 1; 445 while (*arg == DIRNAME_SEPARATOR) 446 ++arg; 447 } 448 449 /* If there are no more directories in this argument then start 450 on the next argument next time round the loop (if any). */ 451 if (*arg == '\0') 452 arg = parse_separators ? argv[++argv_index] : NULL; 453 } 454 455 /* name is the start of the directory. 456 p is the separator (or null) following the end. */ 457 458 while (!(IS_DIR_SEPARATOR (*name) && p <= name + 1) /* "/" */ 459 #ifdef HAVE_DOS_BASED_FILE_SYSTEM 460 /* On MS-DOS and MS-Windows, h:\ is different from h: */ 461 && !(p == name + 3 && name[1] == ':') /* "d:/" */ 462 #endif 463 && IS_DIR_SEPARATOR (p[-1])) 464 /* Sigh. "foo/" => "foo" */ 465 --p; 466 *p = '\0'; 467 468 while (p > name && p[-1] == '.') 469 { 470 if (p - name == 1) 471 { 472 /* "." => getwd (). */ 473 name = current_directory; 474 goto append; 475 } 476 else if (p > name + 1 && IS_DIR_SEPARATOR (p[-2])) 477 { 478 if (p - name == 2) 479 { 480 /* "/." => "/". */ 481 *--p = '\0'; 482 goto append; 483 } 484 else 485 { 486 /* "...foo/." => "...foo". */ 487 p -= 2; 488 *p = '\0'; 489 continue; 490 } 491 } 492 else 493 break; 494 } 495 496 if (name[0] == '~') 497 name = tilde_expand (name); 498 #ifdef HAVE_DOS_BASED_FILE_SYSTEM 499 else if (IS_ABSOLUTE_PATH (name) && p == name + 2) /* "d:" => "d:." */ 500 name = concat (name, ".", (char *)NULL); 501 #endif 502 else if (!IS_ABSOLUTE_PATH (name) && name[0] != '$') 503 name = concat (current_directory, SLASH_STRING, name, (char *)NULL); 504 else 505 name = savestring (name, p - name); 506 make_cleanup (xfree, name); 507 508 /* Unless it's a variable, check existence. */ 509 if (name[0] != '$') 510 { 511 /* These are warnings, not errors, since we don't want a 512 non-existent directory in a .gdbinit file to stop processing 513 of the .gdbinit file. 514 515 Whether they get added to the path is more debatable. Current 516 answer is yes, in case the user wants to go make the directory 517 or whatever. If the directory continues to not exist/not be 518 a directory/etc, then having them in the path should be 519 harmless. */ 520 if (stat (name, &st) < 0) 521 { 522 int save_errno = errno; 523 524 fprintf_unfiltered (gdb_stderr, "Warning: "); 525 print_sys_errmsg (name, save_errno); 526 } 527 else if ((st.st_mode & S_IFMT) != S_IFDIR) 528 warning (_("%s is not a directory."), name); 529 } 530 531 append: 532 { 533 unsigned int len = strlen (name); 534 535 p = *which_path; 536 while (1) 537 { 538 /* FIXME: strncmp loses in interesting ways on MS-DOS and 539 MS-Windows because of case-insensitivity and two different 540 but functionally identical slash characters. We need a 541 special filesystem-dependent file-name comparison function. 542 543 Actually, even on Unix I would use realpath() or its work- 544 alike before comparing. Then all the code above which 545 removes excess slashes and dots could simply go away. */ 546 if (!strncmp (p, name, len) 547 && (p[len] == '\0' || p[len] == DIRNAME_SEPARATOR)) 548 { 549 /* Found it in the search path, remove old copy */ 550 if (p > *which_path) 551 p--; /* Back over leading separator */ 552 if (prefix > p - *which_path) 553 goto skip_dup; /* Same dir twice in one cmd */ 554 strcpy (p, &p[len + 1]); /* Copy from next \0 or : */ 555 } 556 p = strchr (p, DIRNAME_SEPARATOR); 557 if (p != 0) 558 ++p; 559 else 560 break; 561 } 562 if (p == 0) 563 { 564 char tinybuf[2]; 565 566 tinybuf[0] = DIRNAME_SEPARATOR; 567 tinybuf[1] = '\0'; 568 569 /* If we have already tacked on a name(s) in this command, be sure they stay 570 on the front as we tack on some more. */ 571 if (prefix) 572 { 573 char *temp, c; 574 575 c = old[prefix]; 576 old[prefix] = '\0'; 577 temp = concat (old, tinybuf, name, (char *)NULL); 578 old[prefix] = c; 579 *which_path = concat (temp, "", &old[prefix], (char *)NULL); 580 prefix = strlen (temp); 581 xfree (temp); 582 } 583 else 584 { 585 *which_path = concat (name, (old[0] ? tinybuf : old), 586 old, (char *)NULL); 587 prefix = strlen (name); 588 } 589 xfree (old); 590 old = *which_path; 591 } 592 } 593 skip_dup:; 594 } 595 while (arg != NULL); 596 } 597 598 599 static void 600 source_info (char *ignore, int from_tty) 601 { 602 struct symtab *s = current_source_symtab; 603 604 if (!s) 605 { 606 printf_filtered (_("No current source file.\n")); 607 return; 608 } 609 printf_filtered (_("Current source file is %s\n"), s->filename); 610 if (s->dirname) 611 printf_filtered (_("Compilation directory is %s\n"), s->dirname); 612 if (s->fullname) 613 printf_filtered (_("Located in %s\n"), s->fullname); 614 if (s->nlines) 615 printf_filtered (_("Contains %d line%s.\n"), s->nlines, 616 s->nlines == 1 ? "" : "s"); 617 618 printf_filtered (_("Source language is %s.\n"), language_str (s->language)); 619 printf_filtered (_("Compiled with %s debugging format.\n"), s->debugformat); 620 printf_filtered (_("%s preprocessor macro info.\n"), 621 s->macro_table ? "Includes" : "Does not include"); 622 } 623 624 625 /* Return True if the file NAME exists and is a regular file */ 626 static int 627 is_regular_file (const char *name) 628 { 629 struct stat st; 630 const int status = stat (name, &st); 631 632 /* Stat should never fail except when the file does not exist. 633 If stat fails, analyze the source of error and return True 634 unless the file does not exist, to avoid returning false results 635 on obscure systems where stat does not work as expected. 636 */ 637 if (status != 0) 638 return (errno != ENOENT); 639 640 return S_ISREG (st.st_mode); 641 } 642 643 /* Open a file named STRING, searching path PATH (dir names sep by some char) 644 using mode MODE in the calls to open. You cannot use this function to 645 create files (O_CREAT). 646 647 OPTS specifies the function behaviour in specific cases. 648 649 If OPF_TRY_CWD_FIRST, try to open ./STRING before searching PATH. 650 (ie pretend the first element of PATH is "."). This also indicates 651 that a slash in STRING disables searching of the path (this is 652 so that "exec-file ./foo" or "symbol-file ./foo" insures that you 653 get that particular version of foo or an error message). 654 655 If OPTS has OPF_SEARCH_IN_PATH set, absolute names will also be 656 searched in path (we usually want this for source files but not for 657 executables). 658 659 If FILENAME_OPENED is non-null, set it to a newly allocated string naming 660 the actual file opened (this string will always start with a "/"). We 661 have to take special pains to avoid doubling the "/" between the directory 662 and the file, sigh! Emacs gets confuzzed by this when we print the 663 source file name!!! 664 665 If a file is found, return the descriptor. 666 Otherwise, return -1, with errno set for the last name we tried to open. */ 667 668 /* >>>> This should only allow files of certain types, 669 >>>> eg executable, non-directory */ 670 int 671 openp (const char *path, int opts, const char *string, 672 int mode, char **filename_opened) 673 { 674 int fd; 675 char *filename; 676 const char *p; 677 const char *p1; 678 int len; 679 int alloclen; 680 681 /* The open syscall MODE parameter is not specified. */ 682 gdb_assert ((mode & O_CREAT) == 0); 683 gdb_assert (string != NULL); 684 685 /* A file with an empty name cannot possibly exist. Report a failure 686 without further checking. 687 688 This is an optimization which also defends us against buggy 689 implementations of the "stat" function. For instance, we have 690 noticed that a MinGW debugger built on Windows XP 32bits crashes 691 when the debugger is started with an empty argument. */ 692 if (string[0] == '\0') 693 { 694 errno = ENOENT; 695 return -1; 696 } 697 698 if (!path) 699 path = "."; 700 701 mode |= O_BINARY; 702 703 if ((opts & OPF_TRY_CWD_FIRST) || IS_ABSOLUTE_PATH (string)) 704 { 705 int i; 706 707 if (is_regular_file (string)) 708 { 709 filename = alloca (strlen (string) + 1); 710 strcpy (filename, string); 711 fd = open (filename, mode); 712 if (fd >= 0) 713 goto done; 714 } 715 else 716 { 717 filename = NULL; 718 fd = -1; 719 } 720 721 if (!(opts & OPF_SEARCH_IN_PATH)) 722 for (i = 0; string[i]; i++) 723 if (IS_DIR_SEPARATOR (string[i])) 724 goto done; 725 } 726 727 /* For dos paths, d:/foo -> /foo, and d:foo -> foo. */ 728 if (HAS_DRIVE_SPEC (string)) 729 string = STRIP_DRIVE_SPEC (string); 730 731 /* /foo => foo, to avoid multiple slashes that Emacs doesn't like. */ 732 while (IS_DIR_SEPARATOR(string[0])) 733 string++; 734 735 /* ./foo => foo */ 736 while (string[0] == '.' && IS_DIR_SEPARATOR (string[1])) 737 string += 2; 738 739 alloclen = strlen (path) + strlen (string) + 2; 740 filename = alloca (alloclen); 741 fd = -1; 742 for (p = path; p; p = p1 ? p1 + 1 : 0) 743 { 744 p1 = strchr (p, DIRNAME_SEPARATOR); 745 if (p1) 746 len = p1 - p; 747 else 748 len = strlen (p); 749 750 if (len == 4 && p[0] == '$' && p[1] == 'c' 751 && p[2] == 'w' && p[3] == 'd') 752 { 753 /* Name is $cwd -- insert current directory name instead. */ 754 int newlen; 755 756 /* First, realloc the filename buffer if too short. */ 757 len = strlen (current_directory); 758 newlen = len + strlen (string) + 2; 759 if (newlen > alloclen) 760 { 761 alloclen = newlen; 762 filename = alloca (alloclen); 763 } 764 strcpy (filename, current_directory); 765 } 766 else 767 { 768 /* Normal file name in path -- just use it. */ 769 strncpy (filename, p, len); 770 filename[len] = 0; 771 772 /* Don't search $cdir. It's also a magic path like $cwd, but we 773 don't have enough information to expand it. The user *could* 774 have an actual directory named '$cdir' but handling that would 775 be confusing, it would mean different things in different 776 contexts. If the user really has '$cdir' one can use './$cdir'. 777 We can get $cdir when loading scripts. When loading source files 778 $cdir must have already been expanded to the correct value. */ 779 if (strcmp (filename, "$cdir") == 0) 780 continue; 781 } 782 783 /* Remove trailing slashes */ 784 while (len > 0 && IS_DIR_SEPARATOR (filename[len - 1])) 785 filename[--len] = 0; 786 787 strcat (filename + len, SLASH_STRING); 788 strcat (filename, string); 789 790 if (is_regular_file (filename)) 791 { 792 fd = open (filename, mode); 793 if (fd >= 0) 794 break; 795 } 796 } 797 798 done: 799 if (filename_opened) 800 { 801 /* If a file was opened, canonicalize its filename. Use xfullpath 802 rather than gdb_realpath to avoid resolving the basename part 803 of filenames when the associated file is a symbolic link. This 804 fixes a potential inconsistency between the filenames known to 805 GDB and the filenames it prints in the annotations. */ 806 if (fd < 0) 807 *filename_opened = NULL; 808 else if (IS_ABSOLUTE_PATH (filename)) 809 *filename_opened = xfullpath (filename); 810 else 811 { 812 /* Beware the // my son, the Emacs barfs, the botch that catch... */ 813 814 char *f = concat (current_directory, 815 IS_DIR_SEPARATOR (current_directory[strlen (current_directory) - 1]) 816 ? "" : SLASH_STRING, 817 filename, (char *)NULL); 818 819 *filename_opened = xfullpath (f); 820 xfree (f); 821 } 822 } 823 824 return fd; 825 } 826 827 828 /* This is essentially a convenience, for clients that want the behaviour 829 of openp, using source_path, but that really don't want the file to be 830 opened but want instead just to know what the full pathname is (as 831 qualified against source_path). 832 833 The current working directory is searched first. 834 835 If the file was found, this function returns 1, and FULL_PATHNAME is 836 set to the fully-qualified pathname. 837 838 Else, this functions returns 0, and FULL_PATHNAME is set to NULL. */ 839 int 840 source_full_path_of (const char *filename, char **full_pathname) 841 { 842 int fd; 843 844 fd = openp (source_path, OPF_TRY_CWD_FIRST | OPF_SEARCH_IN_PATH, filename, 845 O_RDONLY, full_pathname); 846 if (fd < 0) 847 { 848 *full_pathname = NULL; 849 return 0; 850 } 851 852 close (fd); 853 return 1; 854 } 855 856 /* Return non-zero if RULE matches PATH, that is if the rule can be 857 applied to PATH. */ 858 859 static int 860 substitute_path_rule_matches (const struct substitute_path_rule *rule, 861 const char *path) 862 { 863 const int from_len = strlen (rule->from); 864 const int path_len = strlen (path); 865 char *path_start; 866 867 if (path_len < from_len) 868 return 0; 869 870 /* The substitution rules are anchored at the start of the path, 871 so the path should start with rule->from. There is no filename 872 comparison routine, so we need to extract the first FROM_LEN 873 characters from PATH first and use that to do the comparison. */ 874 875 path_start = alloca (from_len + 1); 876 strncpy (path_start, path, from_len); 877 path_start[from_len] = '\0'; 878 879 if (FILENAME_CMP (path_start, rule->from) != 0) 880 return 0; 881 882 /* Make sure that the region in the path that matches the substitution 883 rule is immediately followed by a directory separator (or the end of 884 string character). */ 885 886 if (path[from_len] != '\0' && !IS_DIR_SEPARATOR (path[from_len])) 887 return 0; 888 889 return 1; 890 } 891 892 /* Find the substitute-path rule that applies to PATH and return it. 893 Return NULL if no rule applies. */ 894 895 static struct substitute_path_rule * 896 get_substitute_path_rule (const char *path) 897 { 898 struct substitute_path_rule *rule = substitute_path_rules; 899 900 while (rule != NULL && !substitute_path_rule_matches (rule, path)) 901 rule = rule->next; 902 903 return rule; 904 } 905 906 /* If the user specified a source path substitution rule that applies 907 to PATH, then apply it and return the new path. This new path must 908 be deallocated afterwards. 909 910 Return NULL if no substitution rule was specified by the user, 911 or if no rule applied to the given PATH. */ 912 913 static char * 914 rewrite_source_path (const char *path) 915 { 916 const struct substitute_path_rule *rule = get_substitute_path_rule (path); 917 char *new_path; 918 int from_len; 919 920 if (rule == NULL) 921 return NULL; 922 923 from_len = strlen (rule->from); 924 925 /* Compute the rewritten path and return it. */ 926 927 new_path = 928 (char *) xmalloc (strlen (path) + 1 + strlen (rule->to) - from_len); 929 strcpy (new_path, rule->to); 930 strcat (new_path, path + from_len); 931 932 return new_path; 933 } 934 935 /* This function is capable of finding the absolute path to a 936 source file, and opening it, provided you give it a FILENAME. Both the 937 DIRNAME and FULLNAME are only added suggestions on where to find the file. 938 939 FILENAME should be the filename to open. 940 DIRNAME is the compilation directory of a particular source file. 941 Only some debug formats provide this info. 942 FULLNAME can be the last known absolute path to the file in question. 943 Space for the path must have been malloc'd. If a path substitution 944 is applied we free the old value and set a new one. 945 946 On Success 947 A valid file descriptor is returned. ( the return value is positive ) 948 FULLNAME is set to the absolute path to the file just opened. 949 The caller is responsible for freeing FULLNAME. 950 951 On Failure 952 An invalid file descriptor is returned. ( the return value is negative ) 953 FULLNAME is set to NULL. */ 954 955 int 956 find_and_open_source (const char *filename, 957 const char *dirname, 958 char **fullname) 959 { 960 char *path = source_path; 961 const char *p; 962 int result; 963 964 /* Quick way out if we already know its full name */ 965 966 if (*fullname) 967 { 968 /* The user may have requested that source paths be rewritten 969 according to substitution rules he provided. If a substitution 970 rule applies to this path, then apply it. */ 971 char *rewritten_fullname = rewrite_source_path (*fullname); 972 973 if (rewritten_fullname != NULL) 974 { 975 xfree (*fullname); 976 *fullname = rewritten_fullname; 977 } 978 979 result = open (*fullname, OPEN_MODE); 980 if (result >= 0) 981 return result; 982 /* Didn't work -- free old one, try again. */ 983 xfree (*fullname); 984 *fullname = NULL; 985 } 986 987 if (dirname != NULL) 988 { 989 /* If necessary, rewrite the compilation directory name according 990 to the source path substitution rules specified by the user. */ 991 992 char *rewritten_dirname = rewrite_source_path (dirname); 993 994 if (rewritten_dirname != NULL) 995 { 996 make_cleanup (xfree, rewritten_dirname); 997 dirname = rewritten_dirname; 998 } 999 1000 /* Replace a path entry of $cdir with the compilation directory name */ 1001 #define cdir_len 5 1002 /* We cast strstr's result in case an ANSIhole has made it const, 1003 which produces a "required warning" when assigned to a nonconst. */ 1004 p = (char *) strstr (source_path, "$cdir"); 1005 if (p && (p == path || p[-1] == DIRNAME_SEPARATOR) 1006 && (p[cdir_len] == DIRNAME_SEPARATOR || p[cdir_len] == '\0')) 1007 { 1008 int len; 1009 1010 path = (char *) 1011 alloca (strlen (source_path) + 1 + strlen (dirname) + 1); 1012 len = p - source_path; 1013 strncpy (path, source_path, len); /* Before $cdir */ 1014 strcpy (path + len, dirname); /* new stuff */ 1015 strcat (path + len, source_path + len + cdir_len); /* After $cdir */ 1016 } 1017 } 1018 1019 if (IS_ABSOLUTE_PATH (filename)) 1020 { 1021 /* If filename is absolute path, try the source path 1022 substitution on it. */ 1023 char *rewritten_filename = rewrite_source_path (filename); 1024 1025 if (rewritten_filename != NULL) 1026 { 1027 make_cleanup (xfree, rewritten_filename); 1028 filename = rewritten_filename; 1029 } 1030 } 1031 1032 result = openp (path, OPF_SEARCH_IN_PATH, filename, OPEN_MODE, fullname); 1033 if (result < 0) 1034 { 1035 /* Didn't work. Try using just the basename. */ 1036 p = lbasename (filename); 1037 if (p != filename) 1038 result = openp (path, OPF_SEARCH_IN_PATH, p, OPEN_MODE, fullname); 1039 } 1040 1041 return result; 1042 } 1043 1044 /* Open a source file given a symtab S. Returns a file descriptor or 1045 negative number for error. 1046 1047 This function is a convience function to find_and_open_source. */ 1048 1049 int 1050 open_source_file (struct symtab *s) 1051 { 1052 if (!s) 1053 return -1; 1054 1055 return find_and_open_source (s->filename, s->dirname, &s->fullname); 1056 } 1057 1058 /* Finds the fullname that a symtab represents. 1059 1060 If this functions finds the fullname, it will save it in s->fullname 1061 and it will also return the value. 1062 1063 If this function fails to find the file that this symtab represents, 1064 NULL will be returned and s->fullname will be set to NULL. */ 1065 char * 1066 symtab_to_fullname (struct symtab *s) 1067 { 1068 int r; 1069 1070 if (!s) 1071 return NULL; 1072 1073 /* Don't check s->fullname here, the file could have been 1074 deleted/moved/..., look for it again */ 1075 r = find_and_open_source (s->filename, s->dirname, &s->fullname); 1076 1077 if (r >= 0) 1078 { 1079 close (r); 1080 return s->fullname; 1081 } 1082 1083 return NULL; 1084 } 1085 1086 /* Create and initialize the table S->line_charpos that records 1087 the positions of the lines in the source file, which is assumed 1088 to be open on descriptor DESC. 1089 All set S->nlines to the number of such lines. */ 1090 1091 void 1092 find_source_lines (struct symtab *s, int desc) 1093 { 1094 struct stat st; 1095 char *data, *p, *end; 1096 int nlines = 0; 1097 int lines_allocated = 1000; 1098 int *line_charpos; 1099 long mtime = 0; 1100 int size; 1101 1102 gdb_assert (s); 1103 line_charpos = (int *) xmalloc (lines_allocated * sizeof (int)); 1104 if (fstat (desc, &st) < 0) 1105 perror_with_name (s->filename); 1106 1107 if (s->objfile && s->objfile->obfd) 1108 mtime = s->objfile->mtime; 1109 else if (exec_bfd) 1110 mtime = exec_bfd_mtime; 1111 1112 if (mtime && mtime < st.st_mtime) 1113 warning (_("Source file is more recent than executable.")); 1114 1115 #ifdef LSEEK_NOT_LINEAR 1116 { 1117 char c; 1118 1119 /* Have to read it byte by byte to find out where the chars live */ 1120 1121 line_charpos[0] = lseek (desc, 0, SEEK_CUR); 1122 nlines = 1; 1123 while (myread (desc, &c, 1) > 0) 1124 { 1125 if (c == '\n') 1126 { 1127 if (nlines == lines_allocated) 1128 { 1129 lines_allocated *= 2; 1130 line_charpos = 1131 (int *) xrealloc ((char *) line_charpos, 1132 sizeof (int) * lines_allocated); 1133 } 1134 line_charpos[nlines++] = lseek (desc, 0, SEEK_CUR); 1135 } 1136 } 1137 } 1138 #else /* lseek linear. */ 1139 { 1140 struct cleanup *old_cleanups; 1141 1142 /* st_size might be a large type, but we only support source files whose 1143 size fits in an int. */ 1144 size = (int) st.st_size; 1145 1146 /* Use malloc, not alloca, because this may be pretty large, and we may 1147 run into various kinds of limits on stack size. */ 1148 data = (char *) xmalloc (size); 1149 old_cleanups = make_cleanup (xfree, data); 1150 1151 /* Reassign `size' to result of read for systems where \r\n -> \n. */ 1152 size = myread (desc, data, size); 1153 if (size < 0) 1154 perror_with_name (s->filename); 1155 end = data + size; 1156 p = data; 1157 line_charpos[0] = 0; 1158 nlines = 1; 1159 while (p != end) 1160 { 1161 if (*p++ == '\n' 1162 /* A newline at the end does not start a new line. */ 1163 && p != end) 1164 { 1165 if (nlines == lines_allocated) 1166 { 1167 lines_allocated *= 2; 1168 line_charpos = 1169 (int *) xrealloc ((char *) line_charpos, 1170 sizeof (int) * lines_allocated); 1171 } 1172 line_charpos[nlines++] = p - data; 1173 } 1174 } 1175 do_cleanups (old_cleanups); 1176 } 1177 #endif /* lseek linear. */ 1178 s->nlines = nlines; 1179 s->line_charpos = 1180 (int *) xrealloc ((char *) line_charpos, nlines * sizeof (int)); 1181 1182 } 1183 1184 /* Return the character position of a line LINE in symtab S. 1185 Return 0 if anything is invalid. */ 1186 1187 #if 0 /* Currently unused */ 1188 1189 int 1190 source_line_charpos (struct symtab *s, int line) 1191 { 1192 if (!s) 1193 return 0; 1194 if (!s->line_charpos || line <= 0) 1195 return 0; 1196 if (line > s->nlines) 1197 line = s->nlines; 1198 return s->line_charpos[line - 1]; 1199 } 1200 1201 /* Return the line number of character position POS in symtab S. */ 1202 1203 int 1204 source_charpos_line (struct symtab *s, int chr) 1205 { 1206 int line = 0; 1207 int *lnp; 1208 1209 if (s == 0 || s->line_charpos == 0) 1210 return 0; 1211 lnp = s->line_charpos; 1212 /* Files are usually short, so sequential search is Ok */ 1213 while (line < s->nlines && *lnp <= chr) 1214 { 1215 line++; 1216 lnp++; 1217 } 1218 if (line >= s->nlines) 1219 line = s->nlines; 1220 return line; 1221 } 1222 1223 #endif /* 0 */ 1224 1225 1226 /* Get full pathname and line number positions for a symtab. 1227 Return nonzero if line numbers may have changed. 1228 Set *FULLNAME to actual name of the file as found by `openp', 1229 or to 0 if the file is not found. */ 1230 1231 static int 1232 get_filename_and_charpos (struct symtab *s, char **fullname) 1233 { 1234 int desc, linenums_changed = 0; 1235 struct cleanup *cleanups; 1236 1237 desc = open_source_file (s); 1238 if (desc < 0) 1239 { 1240 if (fullname) 1241 *fullname = NULL; 1242 return 0; 1243 } 1244 cleanups = make_cleanup_close (desc); 1245 if (fullname) 1246 *fullname = s->fullname; 1247 if (s->line_charpos == 0) 1248 linenums_changed = 1; 1249 if (linenums_changed) 1250 find_source_lines (s, desc); 1251 do_cleanups (cleanups); 1252 return linenums_changed; 1253 } 1254 1255 /* Print text describing the full name of the source file S 1256 and the line number LINE and its corresponding character position. 1257 The text starts with two Ctrl-z so that the Emacs-GDB interface 1258 can easily find it. 1259 1260 MID_STATEMENT is nonzero if the PC is not at the beginning of that line. 1261 1262 Return 1 if successful, 0 if could not find the file. */ 1263 1264 int 1265 identify_source_line (struct symtab *s, int line, int mid_statement, 1266 CORE_ADDR pc) 1267 { 1268 if (s->line_charpos == 0) 1269 get_filename_and_charpos (s, (char **) NULL); 1270 if (s->fullname == 0) 1271 return 0; 1272 if (line > s->nlines) 1273 /* Don't index off the end of the line_charpos array. */ 1274 return 0; 1275 annotate_source (s->fullname, line, s->line_charpos[line - 1], 1276 mid_statement, get_objfile_arch (s->objfile), pc); 1277 1278 current_source_line = line; 1279 first_line_listed = line; 1280 last_line_listed = line; 1281 current_source_symtab = s; 1282 return 1; 1283 } 1284 1285 1286 /* Print source lines from the file of symtab S, 1287 starting with line number LINE and stopping before line number STOPLINE. */ 1288 1289 static void print_source_lines_base (struct symtab *s, int line, int stopline, 1290 int noerror); 1291 static void 1292 print_source_lines_base (struct symtab *s, int line, int stopline, int noerror) 1293 { 1294 int c; 1295 int desc; 1296 int noprint = 0; 1297 FILE *stream; 1298 int nlines = stopline - line; 1299 struct cleanup *cleanup; 1300 1301 /* Regardless of whether we can open the file, set current_source_symtab. */ 1302 current_source_symtab = s; 1303 current_source_line = line; 1304 first_line_listed = line; 1305 1306 /* If printing of source lines is disabled, just print file and line number */ 1307 if (ui_out_test_flags (uiout, ui_source_list)) 1308 { 1309 /* Only prints "No such file or directory" once */ 1310 if ((s != last_source_visited) || (!last_source_error)) 1311 { 1312 last_source_visited = s; 1313 desc = open_source_file (s); 1314 } 1315 else 1316 { 1317 desc = last_source_error; 1318 noerror = 1; 1319 } 1320 } 1321 else 1322 { 1323 desc = last_source_error; 1324 noerror = 1; 1325 noprint = 1; 1326 } 1327 1328 if (desc < 0 || noprint) 1329 { 1330 last_source_error = desc; 1331 1332 if (!noerror) 1333 { 1334 char *name = alloca (strlen (s->filename) + 100); 1335 sprintf (name, "%d\t%s", line, s->filename); 1336 print_sys_errmsg (name, errno); 1337 } 1338 else 1339 ui_out_field_int (uiout, "line", line); 1340 ui_out_text (uiout, "\tin "); 1341 ui_out_field_string (uiout, "file", s->filename); 1342 ui_out_text (uiout, "\n"); 1343 1344 return; 1345 } 1346 1347 last_source_error = 0; 1348 1349 if (s->line_charpos == 0) 1350 find_source_lines (s, desc); 1351 1352 if (line < 1 || line > s->nlines) 1353 { 1354 close (desc); 1355 error (_("Line number %d out of range; %s has %d lines."), 1356 line, s->filename, s->nlines); 1357 } 1358 1359 if (lseek (desc, s->line_charpos[line - 1], 0) < 0) 1360 { 1361 close (desc); 1362 perror_with_name (s->filename); 1363 } 1364 1365 stream = fdopen (desc, FDOPEN_MODE); 1366 clearerr (stream); 1367 cleanup = make_cleanup_fclose (stream); 1368 1369 while (nlines-- > 0) 1370 { 1371 char buf[20]; 1372 1373 c = fgetc (stream); 1374 if (c == EOF) 1375 break; 1376 last_line_listed = current_source_line; 1377 sprintf (buf, "%d\t", current_source_line++); 1378 ui_out_text (uiout, buf); 1379 do 1380 { 1381 if (c < 040 && c != '\t' && c != '\n' && c != '\r') 1382 { 1383 sprintf (buf, "^%c", c + 0100); 1384 ui_out_text (uiout, buf); 1385 } 1386 else if (c == 0177) 1387 ui_out_text (uiout, "^?"); 1388 else if (c == '\r') 1389 { 1390 /* Skip a \r character, but only before a \n. */ 1391 int c1 = fgetc (stream); 1392 1393 if (c1 != '\n') 1394 printf_filtered ("^%c", c + 0100); 1395 if (c1 != EOF) 1396 ungetc (c1, stream); 1397 } 1398 else 1399 { 1400 sprintf (buf, "%c", c); 1401 ui_out_text (uiout, buf); 1402 } 1403 } 1404 while (c != '\n' && (c = fgetc (stream)) >= 0); 1405 } 1406 1407 do_cleanups (cleanup); 1408 } 1409 1410 /* Show source lines from the file of symtab S, starting with line 1411 number LINE and stopping before line number STOPLINE. If this is 1412 not the command line version, then the source is shown in the source 1413 window otherwise it is simply printed */ 1414 1415 void 1416 print_source_lines (struct symtab *s, int line, int stopline, int noerror) 1417 { 1418 print_source_lines_base (s, line, stopline, noerror); 1419 } 1420 1421 /* Print info on range of pc's in a specified line. */ 1422 1423 static void 1424 line_info (char *arg, int from_tty) 1425 { 1426 struct symtabs_and_lines sals; 1427 struct symtab_and_line sal; 1428 CORE_ADDR start_pc, end_pc; 1429 int i; 1430 1431 init_sal (&sal); /* initialize to zeroes */ 1432 1433 if (arg == 0) 1434 { 1435 sal.symtab = current_source_symtab; 1436 sal.line = last_line_listed; 1437 sals.nelts = 1; 1438 sals.sals = (struct symtab_and_line *) 1439 xmalloc (sizeof (struct symtab_and_line)); 1440 sals.sals[0] = sal; 1441 } 1442 else 1443 { 1444 sals = decode_line_spec_1 (arg, 0); 1445 1446 dont_repeat (); 1447 } 1448 1449 /* C++ More than one line may have been specified, as when the user 1450 specifies an overloaded function name. Print info on them all. */ 1451 for (i = 0; i < sals.nelts; i++) 1452 { 1453 sal = sals.sals[i]; 1454 1455 if (sal.symtab == 0) 1456 { 1457 struct gdbarch *gdbarch = get_current_arch (); 1458 1459 printf_filtered (_("No line number information available")); 1460 if (sal.pc != 0) 1461 { 1462 /* This is useful for "info line *0x7f34". If we can't tell the 1463 user about a source line, at least let them have the symbolic 1464 address. */ 1465 printf_filtered (" for address "); 1466 wrap_here (" "); 1467 print_address (gdbarch, sal.pc, gdb_stdout); 1468 } 1469 else 1470 printf_filtered ("."); 1471 printf_filtered ("\n"); 1472 } 1473 else if (sal.line > 0 1474 && find_line_pc_range (sal, &start_pc, &end_pc)) 1475 { 1476 struct gdbarch *gdbarch = get_objfile_arch (sal.symtab->objfile); 1477 1478 if (start_pc == end_pc) 1479 { 1480 printf_filtered ("Line %d of \"%s\"", 1481 sal.line, sal.symtab->filename); 1482 wrap_here (" "); 1483 printf_filtered (" is at address "); 1484 print_address (gdbarch, start_pc, gdb_stdout); 1485 wrap_here (" "); 1486 printf_filtered (" but contains no code.\n"); 1487 } 1488 else 1489 { 1490 printf_filtered ("Line %d of \"%s\"", 1491 sal.line, sal.symtab->filename); 1492 wrap_here (" "); 1493 printf_filtered (" starts at address "); 1494 print_address (gdbarch, start_pc, gdb_stdout); 1495 wrap_here (" "); 1496 printf_filtered (" and ends at "); 1497 print_address (gdbarch, end_pc, gdb_stdout); 1498 printf_filtered (".\n"); 1499 } 1500 1501 /* x/i should display this line's code. */ 1502 set_next_address (gdbarch, start_pc); 1503 1504 /* Repeating "info line" should do the following line. */ 1505 last_line_listed = sal.line + 1; 1506 1507 /* If this is the only line, show the source code. If it could 1508 not find the file, don't do anything special. */ 1509 if (annotation_level && sals.nelts == 1) 1510 identify_source_line (sal.symtab, sal.line, 0, start_pc); 1511 } 1512 else 1513 /* Is there any case in which we get here, and have an address 1514 which the user would want to see? If we have debugging symbols 1515 and no line numbers? */ 1516 printf_filtered (_("Line number %d is out of range for \"%s\".\n"), 1517 sal.line, sal.symtab->filename); 1518 } 1519 xfree (sals.sals); 1520 } 1521 1522 /* Commands to search the source file for a regexp. */ 1523 1524 static void 1525 forward_search_command (char *regex, int from_tty) 1526 { 1527 int c; 1528 int desc; 1529 FILE *stream; 1530 int line; 1531 char *msg; 1532 struct cleanup *cleanups; 1533 1534 line = last_line_listed + 1; 1535 1536 msg = (char *) re_comp (regex); 1537 if (msg) 1538 error (("%s"), msg); 1539 1540 if (current_source_symtab == 0) 1541 select_source_symtab (0); 1542 1543 desc = open_source_file (current_source_symtab); 1544 if (desc < 0) 1545 perror_with_name (current_source_symtab->filename); 1546 cleanups = make_cleanup_close (desc); 1547 1548 if (current_source_symtab->line_charpos == 0) 1549 find_source_lines (current_source_symtab, desc); 1550 1551 if (line < 1 || line > current_source_symtab->nlines) 1552 error (_("Expression not found")); 1553 1554 if (lseek (desc, current_source_symtab->line_charpos[line - 1], 0) < 0) 1555 perror_with_name (current_source_symtab->filename); 1556 1557 discard_cleanups (cleanups); 1558 stream = fdopen (desc, FDOPEN_MODE); 1559 clearerr (stream); 1560 cleanups = make_cleanup_fclose (stream); 1561 while (1) 1562 { 1563 static char *buf = NULL; 1564 char *p; 1565 int cursize, newsize; 1566 1567 cursize = 256; 1568 buf = xmalloc (cursize); 1569 p = buf; 1570 1571 c = getc (stream); 1572 if (c == EOF) 1573 break; 1574 do 1575 { 1576 *p++ = c; 1577 if (p - buf == cursize) 1578 { 1579 newsize = cursize + cursize / 2; 1580 buf = xrealloc (buf, newsize); 1581 p = buf + cursize; 1582 cursize = newsize; 1583 } 1584 } 1585 while (c != '\n' && (c = getc (stream)) >= 0); 1586 1587 /* Remove the \r, if any, at the end of the line, otherwise 1588 regular expressions that end with $ or \n won't work. */ 1589 if (p - buf > 1 && p[-2] == '\r') 1590 { 1591 p--; 1592 p[-1] = '\n'; 1593 } 1594 1595 /* we now have a source line in buf, null terminate and match */ 1596 *p = 0; 1597 if (re_exec (buf) > 0) 1598 { 1599 /* Match! */ 1600 do_cleanups (cleanups); 1601 print_source_lines (current_source_symtab, line, line + 1, 0); 1602 set_internalvar_integer (lookup_internalvar ("_"), line); 1603 current_source_line = max (line - lines_to_list / 2, 1); 1604 return; 1605 } 1606 line++; 1607 } 1608 1609 printf_filtered (_("Expression not found\n")); 1610 do_cleanups (cleanups); 1611 } 1612 1613 static void 1614 reverse_search_command (char *regex, int from_tty) 1615 { 1616 int c; 1617 int desc; 1618 FILE *stream; 1619 int line; 1620 char *msg; 1621 struct cleanup *cleanups; 1622 1623 line = last_line_listed - 1; 1624 1625 msg = (char *) re_comp (regex); 1626 if (msg) 1627 error (("%s"), msg); 1628 1629 if (current_source_symtab == 0) 1630 select_source_symtab (0); 1631 1632 desc = open_source_file (current_source_symtab); 1633 if (desc < 0) 1634 perror_with_name (current_source_symtab->filename); 1635 cleanups = make_cleanup_close (desc); 1636 1637 if (current_source_symtab->line_charpos == 0) 1638 find_source_lines (current_source_symtab, desc); 1639 1640 if (line < 1 || line > current_source_symtab->nlines) 1641 error (_("Expression not found")); 1642 1643 if (lseek (desc, current_source_symtab->line_charpos[line - 1], 0) < 0) 1644 perror_with_name (current_source_symtab->filename); 1645 1646 discard_cleanups (cleanups); 1647 stream = fdopen (desc, FDOPEN_MODE); 1648 clearerr (stream); 1649 cleanups = make_cleanup_fclose (stream); 1650 while (line > 1) 1651 { 1652 /* FIXME!!! We walk right off the end of buf if we get a long line!!! */ 1653 char buf[4096]; /* Should be reasonable??? */ 1654 char *p = buf; 1655 1656 c = getc (stream); 1657 if (c == EOF) 1658 break; 1659 do 1660 { 1661 *p++ = c; 1662 } 1663 while (c != '\n' && (c = getc (stream)) >= 0); 1664 1665 /* Remove the \r, if any, at the end of the line, otherwise 1666 regular expressions that end with $ or \n won't work. */ 1667 if (p - buf > 1 && p[-2] == '\r') 1668 { 1669 p--; 1670 p[-1] = '\n'; 1671 } 1672 1673 /* We now have a source line in buf; null terminate and match. */ 1674 *p = 0; 1675 if (re_exec (buf) > 0) 1676 { 1677 /* Match! */ 1678 do_cleanups (cleanups); 1679 print_source_lines (current_source_symtab, line, line + 1, 0); 1680 set_internalvar_integer (lookup_internalvar ("_"), line); 1681 current_source_line = max (line - lines_to_list / 2, 1); 1682 return; 1683 } 1684 line--; 1685 if (fseek (stream, current_source_symtab->line_charpos[line - 1], 0) < 0) 1686 { 1687 do_cleanups (cleanups); 1688 perror_with_name (current_source_symtab->filename); 1689 } 1690 } 1691 1692 printf_filtered (_("Expression not found\n")); 1693 do_cleanups (cleanups); 1694 return; 1695 } 1696 1697 /* If the last character of PATH is a directory separator, then strip it. */ 1698 1699 static void 1700 strip_trailing_directory_separator (char *path) 1701 { 1702 const int last = strlen (path) - 1; 1703 1704 if (last < 0) 1705 return; /* No stripping is needed if PATH is the empty string. */ 1706 1707 if (IS_DIR_SEPARATOR (path[last])) 1708 path[last] = '\0'; 1709 } 1710 1711 /* Return the path substitution rule that matches FROM. 1712 Return NULL if no rule matches. */ 1713 1714 static struct substitute_path_rule * 1715 find_substitute_path_rule (const char *from) 1716 { 1717 struct substitute_path_rule *rule = substitute_path_rules; 1718 1719 while (rule != NULL) 1720 { 1721 if (FILENAME_CMP (rule->from, from) == 0) 1722 return rule; 1723 rule = rule->next; 1724 } 1725 1726 return NULL; 1727 } 1728 1729 /* Add a new substitute-path rule at the end of the current list of rules. 1730 The new rule will replace FROM into TO. */ 1731 1732 void 1733 add_substitute_path_rule (char *from, char *to) 1734 { 1735 struct substitute_path_rule *rule; 1736 struct substitute_path_rule *new_rule; 1737 1738 new_rule = xmalloc (sizeof (struct substitute_path_rule)); 1739 new_rule->from = xstrdup (from); 1740 new_rule->to = xstrdup (to); 1741 new_rule->next = NULL; 1742 1743 /* If the list of rules are empty, then insert the new rule 1744 at the head of the list. */ 1745 1746 if (substitute_path_rules == NULL) 1747 { 1748 substitute_path_rules = new_rule; 1749 return; 1750 } 1751 1752 /* Otherwise, skip to the last rule in our list and then append 1753 the new rule. */ 1754 1755 rule = substitute_path_rules; 1756 while (rule->next != NULL) 1757 rule = rule->next; 1758 1759 rule->next = new_rule; 1760 } 1761 1762 /* Remove the given source path substitution rule from the current list 1763 of rules. The memory allocated for that rule is also deallocated. */ 1764 1765 static void 1766 delete_substitute_path_rule (struct substitute_path_rule *rule) 1767 { 1768 if (rule == substitute_path_rules) 1769 substitute_path_rules = rule->next; 1770 else 1771 { 1772 struct substitute_path_rule *prev = substitute_path_rules; 1773 1774 while (prev != NULL && prev->next != rule) 1775 prev = prev->next; 1776 1777 gdb_assert (prev != NULL); 1778 1779 prev->next = rule->next; 1780 } 1781 1782 xfree (rule->from); 1783 xfree (rule->to); 1784 xfree (rule); 1785 } 1786 1787 /* Implement the "show substitute-path" command. */ 1788 1789 static void 1790 show_substitute_path_command (char *args, int from_tty) 1791 { 1792 struct substitute_path_rule *rule = substitute_path_rules; 1793 char **argv; 1794 char *from = NULL; 1795 1796 argv = gdb_buildargv (args); 1797 make_cleanup_freeargv (argv); 1798 1799 /* We expect zero or one argument. */ 1800 1801 if (argv != NULL && argv[0] != NULL && argv[1] != NULL) 1802 error (_("Too many arguments in command")); 1803 1804 if (argv != NULL && argv[0] != NULL) 1805 from = argv[0]; 1806 1807 /* Print the substitution rules. */ 1808 1809 if (from != NULL) 1810 printf_filtered 1811 (_("Source path substitution rule matching `%s':\n"), from); 1812 else 1813 printf_filtered (_("List of all source path substitution rules:\n")); 1814 1815 while (rule != NULL) 1816 { 1817 if (from == NULL || FILENAME_CMP (rule->from, from) == 0) 1818 printf_filtered (" `%s' -> `%s'.\n", rule->from, rule->to); 1819 rule = rule->next; 1820 } 1821 } 1822 1823 /* Implement the "unset substitute-path" command. */ 1824 1825 static void 1826 unset_substitute_path_command (char *args, int from_tty) 1827 { 1828 struct substitute_path_rule *rule = substitute_path_rules; 1829 char **argv = gdb_buildargv (args); 1830 char *from = NULL; 1831 int rule_found = 0; 1832 1833 /* This function takes either 0 or 1 argument. */ 1834 1835 make_cleanup_freeargv (argv); 1836 if (argv != NULL && argv[0] != NULL && argv[1] != NULL) 1837 error (_("Incorrect usage, too many arguments in command")); 1838 1839 if (argv != NULL && argv[0] != NULL) 1840 from = argv[0]; 1841 1842 /* If the user asked for all the rules to be deleted, ask him 1843 to confirm and give him a chance to abort before the action 1844 is performed. */ 1845 1846 if (from == NULL 1847 && !query (_("Delete all source path substitution rules? "))) 1848 error (_("Canceled")); 1849 1850 /* Delete the rule matching the argument. No argument means that 1851 all rules should be deleted. */ 1852 1853 while (rule != NULL) 1854 { 1855 struct substitute_path_rule *next = rule->next; 1856 1857 if (from == NULL || FILENAME_CMP (from, rule->from) == 0) 1858 { 1859 delete_substitute_path_rule (rule); 1860 rule_found = 1; 1861 } 1862 1863 rule = next; 1864 } 1865 1866 /* If the user asked for a specific rule to be deleted but 1867 we could not find it, then report an error. */ 1868 1869 if (from != NULL && !rule_found) 1870 error (_("No substitution rule defined for `%s'"), from); 1871 1872 forget_cached_source_info (); 1873 } 1874 1875 /* Add a new source path substitution rule. */ 1876 1877 static void 1878 set_substitute_path_command (char *args, int from_tty) 1879 { 1880 char **argv; 1881 struct substitute_path_rule *rule; 1882 1883 argv = gdb_buildargv (args); 1884 make_cleanup_freeargv (argv); 1885 1886 if (argv == NULL || argv[0] == NULL || argv [1] == NULL) 1887 error (_("Incorrect usage, too few arguments in command")); 1888 1889 if (argv[2] != NULL) 1890 error (_("Incorrect usage, too many arguments in command")); 1891 1892 if (*(argv[0]) == '\0') 1893 error (_("First argument must be at least one character long")); 1894 1895 /* Strip any trailing directory separator character in either FROM 1896 or TO. The substitution rule already implicitly contains them. */ 1897 strip_trailing_directory_separator (argv[0]); 1898 strip_trailing_directory_separator (argv[1]); 1899 1900 /* If a rule with the same "from" was previously defined, then 1901 delete it. This new rule replaces it. */ 1902 1903 rule = find_substitute_path_rule (argv[0]); 1904 if (rule != NULL) 1905 delete_substitute_path_rule (rule); 1906 1907 /* Insert the new substitution rule. */ 1908 1909 add_substitute_path_rule (argv[0], argv[1]); 1910 forget_cached_source_info (); 1911 } 1912 1913 1914 void 1915 _initialize_source (void) 1916 { 1917 struct cmd_list_element *c; 1918 1919 current_source_symtab = 0; 1920 init_source_path (); 1921 1922 /* The intention is to use POSIX Basic Regular Expressions. 1923 Always use the GNU regex routine for consistency across all hosts. 1924 Our current GNU regex.c does not have all the POSIX features, so this is 1925 just an approximation. */ 1926 re_set_syntax (RE_SYNTAX_GREP); 1927 1928 c = add_cmd ("directory", class_files, directory_command, _("\ 1929 Add directory DIR to beginning of search path for source files.\n\ 1930 Forget cached info on source file locations and line positions.\n\ 1931 DIR can also be $cwd for the current working directory, or $cdir for the\n\ 1932 directory in which the source file was compiled into object code.\n\ 1933 With no argument, reset the search path to $cdir:$cwd, the default."), 1934 &cmdlist); 1935 1936 if (dbx_commands) 1937 add_com_alias ("use", "directory", class_files, 0); 1938 1939 set_cmd_completer (c, filename_completer); 1940 1941 add_cmd ("directories", no_class, show_directories, _("\ 1942 Current search path for finding source files.\n\ 1943 $cwd in the path means the current working directory.\n\ 1944 $cdir in the path means the compilation directory of the source file."), 1945 &showlist); 1946 1947 if (xdb_commands) 1948 { 1949 add_com_alias ("D", "directory", class_files, 0); 1950 add_cmd ("ld", no_class, show_directories, _("\ 1951 Current search path for finding source files.\n\ 1952 $cwd in the path means the current working directory.\n\ 1953 $cdir in the path means the compilation directory of the source file."), 1954 &cmdlist); 1955 } 1956 1957 add_info ("source", source_info, 1958 _("Information about the current source file.")); 1959 1960 add_info ("line", line_info, _("\ 1961 Core addresses of the code for a source line.\n\ 1962 Line can be specified as\n\ 1963 LINENUM, to list around that line in current file,\n\ 1964 FILE:LINENUM, to list around that line in that file,\n\ 1965 FUNCTION, to list around beginning of that function,\n\ 1966 FILE:FUNCTION, to distinguish among like-named static functions.\n\ 1967 Default is to describe the last source line that was listed.\n\n\ 1968 This sets the default address for \"x\" to the line's first instruction\n\ 1969 so that \"x/i\" suffices to start examining the machine code.\n\ 1970 The address is also stored as the value of \"$_\".")); 1971 1972 add_com ("forward-search", class_files, forward_search_command, _("\ 1973 Search for regular expression (see regex(3)) from last line listed.\n\ 1974 The matching line number is also stored as the value of \"$_\".")); 1975 add_com_alias ("search", "forward-search", class_files, 0); 1976 1977 add_com ("reverse-search", class_files, reverse_search_command, _("\ 1978 Search backward for regular expression (see regex(3)) from last line listed.\n\ 1979 The matching line number is also stored as the value of \"$_\".")); 1980 add_com_alias ("rev", "reverse-search", class_files, 1); 1981 1982 if (xdb_commands) 1983 { 1984 add_com_alias ("/", "forward-search", class_files, 0); 1985 add_com_alias ("?", "reverse-search", class_files, 0); 1986 } 1987 1988 add_setshow_integer_cmd ("listsize", class_support, &lines_to_list, _("\ 1989 Set number of source lines gdb will list by default."), _("\ 1990 Show number of source lines gdb will list by default."), NULL, 1991 NULL, 1992 show_lines_to_list, 1993 &setlist, &showlist); 1994 1995 add_cmd ("substitute-path", class_files, set_substitute_path_command, 1996 _("\ 1997 Usage: set substitute-path FROM TO\n\ 1998 Add a substitution rule replacing FROM into TO in source file names.\n\ 1999 If a substitution rule was previously set for FROM, the old rule\n\ 2000 is replaced by the new one."), 2001 &setlist); 2002 2003 add_cmd ("substitute-path", class_files, unset_substitute_path_command, 2004 _("\ 2005 Usage: unset substitute-path [FROM]\n\ 2006 Delete the rule for substituting FROM in source file names. If FROM\n\ 2007 is not specified, all substituting rules are deleted.\n\ 2008 If the debugger cannot find a rule for FROM, it will display a warning."), 2009 &unsetlist); 2010 2011 add_cmd ("substitute-path", class_files, show_substitute_path_command, 2012 _("\ 2013 Usage: show substitute-path [FROM]\n\ 2014 Print the rule for substituting FROM in source file names. If FROM\n\ 2015 is not specified, print all substitution rules."), 2016 &showlist); 2017 } 2018