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 4 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 "symtab.h" 23#include "expression.h" 24#include "language.h" 25#include "command.h" 26#include "source.h" 27#include "gdbcmd.h" 28#include "frame.h" 29#include "value.h" 30#include "gdb_assert.h" 31 32#include <sys/types.h> 33#include "gdb_string.h" 34#include "gdb_stat.h" 35#include <fcntl.h> 36#include "gdbcore.h" 37#include "gdb_regex.h" 38#include "symfile.h" 39#include "objfiles.h" 40#include "annotate.h" 41#include "gdbtypes.h" 42#include "linespec.h" 43#include "filenames.h" /* for DOSish file names */ 44#include "completer.h" 45#include "ui-out.h" 46#include "readline/readline.h" 47 48 49#define OPEN_MODE (O_RDONLY | O_BINARY) 50#define FDOPEN_MODE FOPEN_RB 51 52/* Prototypes for exported functions. */ 53 54void _initialize_source (void); 55 56/* Prototypes for local functions. */ 57 58static int get_filename_and_charpos (struct symtab *, char **); 59 60static void reverse_search_command (char *, int); 61 62static void forward_search_command (char *, int); 63 64static void line_info (char *, int); 65 66static void source_info (char *, int); 67 68static void show_directories (char *, int); 69 70/* Path of directories to search for source files. 71 Same format as the PATH environment variable's value. */ 72 73char *source_path; 74 75/* Support for source path substitution commands. */ 76 77struct substitute_path_rule 78{ 79 char *from; 80 char *to; 81 struct substitute_path_rule *next; 82}; 83 84static struct substitute_path_rule *substitute_path_rules = NULL; 85 86/* Symtab of default file for listing lines of. */ 87 88static struct symtab *current_source_symtab; 89 90/* Default next line to list. */ 91 92static int current_source_line; 93 94/* Default number of lines to print with commands like "list". 95 This is based on guessing how many long (i.e. more than chars_per_line 96 characters) lines there will be. To be completely correct, "list" 97 and friends should be rewritten to count characters and see where 98 things are wrapping, but that would be a fair amount of work. */ 99 100int lines_to_list = 10; 101static void 102show_lines_to_list (struct ui_file *file, int from_tty, 103 struct cmd_list_element *c, const char *value) 104{ 105 fprintf_filtered (file, _("\ 106Number of source lines gdb will list by default is %s.\n"), 107 value); 108} 109 110/* Line number of last line printed. Default for various commands. 111 current_source_line is usually, but not always, the same as this. */ 112 113static int last_line_listed; 114 115/* First line number listed by last listing command. */ 116 117static int first_line_listed; 118 119/* Saves the name of the last source file visited and a possible error code. 120 Used to prevent repeating annoying "No such file or directories" msgs */ 121 122static struct symtab *last_source_visited = NULL; 123static int last_source_error = 0; 124 125/* Return the first line listed by print_source_lines. 126 Used by command interpreters to request listing from 127 a previous point. */ 128 129int 130get_first_line_listed (void) 131{ 132 return first_line_listed; 133} 134 135/* Return the default number of lines to print with commands like the 136 cli "list". The caller of print_source_lines must use this to 137 calculate the end line and use it in the call to print_source_lines 138 as it does not automatically use this value. */ 139 140int 141get_lines_to_list (void) 142{ 143 return lines_to_list; 144} 145 146/* Return the current source file for listing and next line to list. 147 NOTE: The returned sal pc and end fields are not valid. */ 148 149struct symtab_and_line 150get_current_source_symtab_and_line (void) 151{ 152 struct symtab_and_line cursal = { 0 }; 153 154 cursal.symtab = current_source_symtab; 155 cursal.line = current_source_line; 156 cursal.pc = 0; 157 cursal.end = 0; 158 159 return cursal; 160} 161 162/* If the current source file for listing is not set, try and get a default. 163 Usually called before get_current_source_symtab_and_line() is called. 164 It may err out if a default cannot be determined. 165 We must be cautious about where it is called, as it can recurse as the 166 process of determining a new default may call the caller! 167 Use get_current_source_symtab_and_line only to get whatever 168 we have without erroring out or trying to get a default. */ 169 170void 171set_default_source_symtab_and_line (void) 172{ 173 struct symtab_and_line cursal; 174 175 if (!have_full_symbols () && !have_partial_symbols ()) 176 error (_("No symbol table is loaded. Use the \"file\" command.")); 177 178 /* Pull in a current source symtab if necessary */ 179 if (current_source_symtab == 0) 180 select_source_symtab (0); 181} 182 183/* Return the current default file for listing and next line to list 184 (the returned sal pc and end fields are not valid.) 185 and set the current default to whatever is in SAL. 186 NOTE: The returned sal pc and end fields are not valid. */ 187 188struct symtab_and_line 189set_current_source_symtab_and_line (const struct symtab_and_line *sal) 190{ 191 struct symtab_and_line cursal = { 0 }; 192 193 cursal.symtab = current_source_symtab; 194 cursal.line = current_source_line; 195 196 current_source_symtab = sal->symtab; 197 current_source_line = sal->line; 198 cursal.pc = 0; 199 cursal.end = 0; 200 201 return cursal; 202} 203 204/* Reset any information stored about a default file and line to print. */ 205 206void 207clear_current_source_symtab_and_line (void) 208{ 209 current_source_symtab = 0; 210 current_source_line = 0; 211} 212 213/* Set the source file default for the "list" command to be S. 214 215 If S is NULL, and we don't have a default, find one. This 216 should only be called when the user actually tries to use the 217 default, since we produce an error if we can't find a reasonable 218 default. Also, since this can cause symbols to be read, doing it 219 before we need to would make things slower than necessary. */ 220 221void 222select_source_symtab (struct symtab *s) 223{ 224 struct symtabs_and_lines sals; 225 struct symtab_and_line sal; 226 struct partial_symtab *ps; 227 struct partial_symtab *cs_pst = 0; 228 struct objfile *ofp; 229 230 if (s) 231 { 232 current_source_symtab = s; 233 current_source_line = 1; 234 return; 235 } 236 237 if (current_source_symtab) 238 return; 239 240 /* Make the default place to list be the function `main' 241 if one exists. */ 242 if (lookup_symbol (main_name (), 0, VAR_DOMAIN, 0, NULL)) 243 { 244 sals = decode_line_spec (main_name (), 1); 245 sal = sals.sals[0]; 246 xfree (sals.sals); 247 current_source_symtab = sal.symtab; 248 current_source_line = max (sal.line - (lines_to_list - 1), 1); 249 if (current_source_symtab) 250 return; 251 } 252 253 /* All right; find the last file in the symtab list (ignoring .h's). */ 254 255 current_source_line = 1; 256 257 for (ofp = object_files; ofp != NULL; ofp = ofp->next) 258 { 259 for (s = ofp->symtabs; s; s = s->next) 260 { 261 const char *name = s->filename; 262 int len = strlen (name); 263 if (!(len > 2 && strcmp(&name[len - 2], ".h") == 0)) 264 current_source_symtab = s; 265 } 266 } 267 if (current_source_symtab) 268 return; 269 270 /* Howabout the partial symbol tables? */ 271 272 for (ofp = object_files; ofp != NULL; ofp = ofp->next) 273 { 274 for (ps = ofp->psymtabs; ps != NULL; ps = ps->next) 275 { 276 const char *name = ps->filename; 277 int len = strlen (name); 278 if (!(len > 2 && strcmp (&name[len - 2], ".h") == 0)) 279 cs_pst = ps; 280 } 281 } 282 if (cs_pst) 283 { 284 if (cs_pst->readin) 285 { 286 internal_error (__FILE__, __LINE__, 287 _("select_source_symtab: " 288 "readin pst found and no symtabs.")); 289 } 290 else 291 { 292 current_source_symtab = PSYMTAB_TO_SYMTAB (cs_pst); 293 } 294 } 295 if (current_source_symtab) 296 return; 297 298 error (_("Can't find a default source file")); 299} 300 301static void 302show_directories (char *ignore, int from_tty) 303{ 304 puts_filtered ("Source directories searched: "); 305 puts_filtered (source_path); 306 puts_filtered ("\n"); 307} 308 309/* Forget what we learned about line positions in source files, and 310 which directories contain them; must check again now since files 311 may be found in a different directory now. */ 312 313void 314forget_cached_source_info (void) 315{ 316 struct symtab *s; 317 struct objfile *objfile; 318 struct partial_symtab *pst; 319 320 for (objfile = object_files; objfile != NULL; objfile = objfile->next) 321 { 322 for (s = objfile->symtabs; s != NULL; s = s->next) 323 { 324 if (s->line_charpos != NULL) 325 { 326 xfree (s->line_charpos); 327 s->line_charpos = NULL; 328 } 329 if (s->fullname != NULL) 330 { 331 xfree (s->fullname); 332 s->fullname = NULL; 333 } 334 } 335 336 ALL_OBJFILE_PSYMTABS (objfile, pst) 337 { 338 if (pst->fullname != NULL) 339 { 340 xfree (pst->fullname); 341 pst->fullname = NULL; 342 } 343 } 344 } 345} 346 347void 348init_source_path (void) 349{ 350 char buf[20]; 351 352 sprintf (buf, "$cdir%c$cwd", DIRNAME_SEPARATOR); 353 source_path = xstrdup (buf); 354 forget_cached_source_info (); 355} 356 357void 358init_last_source_visited (void) 359{ 360 last_source_visited = NULL; 361} 362 363/* Add zero or more directories to the front of the source path. */ 364 365void 366directory_command (char *dirname, int from_tty) 367{ 368 dont_repeat (); 369 /* FIXME, this goes to "delete dir"... */ 370 if (dirname == 0) 371 { 372 if (from_tty && query (_("Reinitialize source path to empty? "))) 373 { 374 xfree (source_path); 375 init_source_path (); 376 } 377 } 378 else 379 { 380 mod_path (dirname, &source_path); 381 last_source_visited = NULL; 382 } 383 if (from_tty) 384 show_directories ((char *) 0, from_tty); 385 forget_cached_source_info (); 386} 387 388/* Add a path given with the -d command line switch. 389 This will not be quoted so we must not treat spaces as separators. */ 390 391void 392directory_switch (char *dirname, int from_tty) 393{ 394 add_path (dirname, &source_path, 0); 395} 396 397/* Add zero or more directories to the front of an arbitrary path. */ 398 399void 400mod_path (char *dirname, char **which_path) 401{ 402 add_path (dirname, which_path, 1); 403} 404 405/* Workhorse of mod_path. Takes an extra argument to determine 406 if dirname should be parsed for separators that indicate multiple 407 directories. This allows for interfaces that pre-parse the dirname 408 and allow specification of traditional separator characters such 409 as space or tab. */ 410 411void 412add_path (char *dirname, char **which_path, int parse_separators) 413{ 414 char *old = *which_path; 415 int prefix = 0; 416 char **argv = NULL; 417 char *arg; 418 int argv_index = 0; 419 420 if (dirname == 0) 421 return; 422 423 if (parse_separators) 424 { 425 /* This will properly parse the space and tab separators 426 and any quotes that may exist. DIRNAME_SEPARATOR will 427 be dealt with later. */ 428 argv = buildargv (dirname); 429 make_cleanup_freeargv (argv); 430 431 if (argv == NULL) 432 nomem (0); 433 434 arg = argv[0]; 435 } 436 else 437 { 438 arg = xstrdup (dirname); 439 make_cleanup (xfree, arg); 440 } 441 442 do 443 { 444 char *name = arg; 445 char *p; 446 struct stat st; 447 448 { 449 char *separator = NULL; 450 451 /* Spaces and tabs will have been removed by buildargv(). 452 The directories will there be split into a list but 453 each entry may still contain DIRNAME_SEPARATOR. */ 454 if (parse_separators) 455 separator = strchr (name, DIRNAME_SEPARATOR); 456 457 if (separator == 0) 458 p = arg = name + strlen (name); 459 else 460 { 461 p = separator; 462 arg = p + 1; 463 while (*arg == DIRNAME_SEPARATOR) 464 ++arg; 465 } 466 467 /* If there are no more directories in this argument then start 468 on the next argument next time round the loop (if any). */ 469 if (*arg == '\0') 470 arg = parse_separators ? argv[++argv_index] : NULL; 471 } 472 473 /* name is the start of the directory. 474 p is the separator (or null) following the end. */ 475 476 while (!(IS_DIR_SEPARATOR (*name) && p <= name + 1) /* "/" */ 477#ifdef HAVE_DOS_BASED_FILE_SYSTEM 478 /* On MS-DOS and MS-Windows, h:\ is different from h: */ 479 && !(p == name + 3 && name[1] == ':') /* "d:/" */ 480#endif 481 && IS_DIR_SEPARATOR (p[-1])) 482 /* Sigh. "foo/" => "foo" */ 483 --p; 484 *p = '\0'; 485 486 while (p > name && p[-1] == '.') 487 { 488 if (p - name == 1) 489 { 490 /* "." => getwd (). */ 491 name = current_directory; 492 goto append; 493 } 494 else if (p > name + 1 && IS_DIR_SEPARATOR (p[-2])) 495 { 496 if (p - name == 2) 497 { 498 /* "/." => "/". */ 499 *--p = '\0'; 500 goto append; 501 } 502 else 503 { 504 /* "...foo/." => "...foo". */ 505 p -= 2; 506 *p = '\0'; 507 continue; 508 } 509 } 510 else 511 break; 512 } 513 514 if (name[0] == '~') 515 name = tilde_expand (name); 516#ifdef HAVE_DOS_BASED_FILE_SYSTEM 517 else if (IS_ABSOLUTE_PATH (name) && p == name + 2) /* "d:" => "d:." */ 518 name = concat (name, ".", (char *)NULL); 519#endif 520 else if (!IS_ABSOLUTE_PATH (name) && name[0] != '$') 521 name = concat (current_directory, SLASH_STRING, name, (char *)NULL); 522 else 523 name = savestring (name, p - name); 524 make_cleanup (xfree, name); 525 526 /* Unless it's a variable, check existence. */ 527 if (name[0] != '$') 528 { 529 /* These are warnings, not errors, since we don't want a 530 non-existent directory in a .gdbinit file to stop processing 531 of the .gdbinit file. 532 533 Whether they get added to the path is more debatable. Current 534 answer is yes, in case the user wants to go make the directory 535 or whatever. If the directory continues to not exist/not be 536 a directory/etc, then having them in the path should be 537 harmless. */ 538 if (stat (name, &st) < 0) 539 { 540 int save_errno = errno; 541 fprintf_unfiltered (gdb_stderr, "Warning: "); 542 print_sys_errmsg (name, save_errno); 543 } 544 else if ((st.st_mode & S_IFMT) != S_IFDIR) 545 warning (_("%s is not a directory."), name); 546 } 547 548 append: 549 { 550 unsigned int len = strlen (name); 551 552 p = *which_path; 553 while (1) 554 { 555 /* FIXME: strncmp loses in interesting ways on MS-DOS and 556 MS-Windows because of case-insensitivity and two different 557 but functionally identical slash characters. We need a 558 special filesystem-dependent file-name comparison function. 559 560 Actually, even on Unix I would use realpath() or its work- 561 alike before comparing. Then all the code above which 562 removes excess slashes and dots could simply go away. */ 563 if (!strncmp (p, name, len) 564 && (p[len] == '\0' || p[len] == DIRNAME_SEPARATOR)) 565 { 566 /* Found it in the search path, remove old copy */ 567 if (p > *which_path) 568 p--; /* Back over leading separator */ 569 if (prefix > p - *which_path) 570 goto skip_dup; /* Same dir twice in one cmd */ 571 strcpy (p, &p[len + 1]); /* Copy from next \0 or : */ 572 } 573 p = strchr (p, DIRNAME_SEPARATOR); 574 if (p != 0) 575 ++p; 576 else 577 break; 578 } 579 if (p == 0) 580 { 581 char tinybuf[2]; 582 583 tinybuf[0] = DIRNAME_SEPARATOR; 584 tinybuf[1] = '\0'; 585 586 /* If we have already tacked on a name(s) in this command, be sure they stay 587 on the front as we tack on some more. */ 588 if (prefix) 589 { 590 char *temp, c; 591 592 c = old[prefix]; 593 old[prefix] = '\0'; 594 temp = concat (old, tinybuf, name, (char *)NULL); 595 old[prefix] = c; 596 *which_path = concat (temp, "", &old[prefix], (char *)NULL); 597 prefix = strlen (temp); 598 xfree (temp); 599 } 600 else 601 { 602 *which_path = concat (name, (old[0] ? tinybuf : old), 603 old, (char *)NULL); 604 prefix = strlen (name); 605 } 606 xfree (old); 607 old = *which_path; 608 } 609 } 610 skip_dup:; 611 } 612 while (arg != NULL); 613} 614 615 616static void 617source_info (char *ignore, int from_tty) 618{ 619 struct symtab *s = current_source_symtab; 620 621 if (!s) 622 { 623 printf_filtered (_("No current source file.\n")); 624 return; 625 } 626 printf_filtered (_("Current source file is %s\n"), s->filename); 627 if (s->dirname) 628 printf_filtered (_("Compilation directory is %s\n"), s->dirname); 629 if (s->fullname) 630 printf_filtered (_("Located in %s\n"), s->fullname); 631 if (s->nlines) 632 printf_filtered (_("Contains %d line%s.\n"), s->nlines, 633 s->nlines == 1 ? "" : "s"); 634 635 printf_filtered (_("Source language is %s.\n"), language_str (s->language)); 636 printf_filtered (_("Compiled with %s debugging format.\n"), s->debugformat); 637 printf_filtered (_("%s preprocessor macro info.\n"), 638 s->macro_table ? "Includes" : "Does not include"); 639} 640 641 642/* Return True if the file NAME exists and is a regular file */ 643static int 644is_regular_file (const char *name) 645{ 646 struct stat st; 647 const int status = stat (name, &st); 648 649 /* Stat should never fail except when the file does not exist. 650 If stat fails, analyze the source of error and return True 651 unless the file does not exist, to avoid returning false results 652 on obscure systems where stat does not work as expected. 653 */ 654 if (status != 0) 655 return (errno != ENOENT); 656 657 return S_ISREG (st.st_mode); 658} 659 660/* Open a file named STRING, searching path PATH (dir names sep by some char) 661 using mode MODE and protection bits PROT in the calls to open. 662 663 OPTS specifies the function behaviour in specific cases. 664 665 If OPF_TRY_CWD_FIRST, try to open ./STRING before searching PATH. 666 (ie pretend the first element of PATH is "."). This also indicates 667 that a slash in STRING disables searching of the path (this is 668 so that "exec-file ./foo" or "symbol-file ./foo" insures that you 669 get that particular version of foo or an error message). 670 671 If OPTS has OPF_SEARCH_IN_PATH set, absolute names will also be 672 searched in path (we usually want this for source files but not for 673 executables). 674 675 If FILENAME_OPENED is non-null, set it to a newly allocated string naming 676 the actual file opened (this string will always start with a "/"). We 677 have to take special pains to avoid doubling the "/" between the directory 678 and the file, sigh! Emacs gets confuzzed by this when we print the 679 source file name!!! 680 681 If a file is found, return the descriptor. 682 Otherwise, return -1, with errno set for the last name we tried to open. */ 683 684/* >>>> This should only allow files of certain types, 685 >>>> eg executable, non-directory */ 686int 687openp (const char *path, int opts, const char *string, 688 int mode, int prot, 689 char **filename_opened) 690{ 691 int fd; 692 char *filename; 693 const char *p; 694 const char *p1; 695 int len; 696 int alloclen; 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, prot); 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 /* /foo => foo, to avoid multiple slashes that Emacs doesn't like. */ 728 while (IS_DIR_SEPARATOR(string[0])) 729 string++; 730 731 /* ./foo => foo */ 732 while (string[0] == '.' && IS_DIR_SEPARATOR (string[1])) 733 string += 2; 734 735 alloclen = strlen (path) + strlen (string) + 2; 736 filename = alloca (alloclen); 737 fd = -1; 738 for (p = path; p; p = p1 ? p1 + 1 : 0) 739 { 740 p1 = strchr (p, DIRNAME_SEPARATOR); 741 if (p1) 742 len = p1 - p; 743 else 744 len = strlen (p); 745 746 if (len == 4 && p[0] == '$' && p[1] == 'c' 747 && p[2] == 'w' && p[3] == 'd') 748 { 749 /* Name is $cwd -- insert current directory name instead. */ 750 int newlen; 751 752 /* First, realloc the filename buffer if too short. */ 753 len = strlen (current_directory); 754 newlen = len + strlen (string) + 2; 755 if (newlen > alloclen) 756 { 757 alloclen = newlen; 758 filename = alloca (alloclen); 759 } 760 strcpy (filename, current_directory); 761 } 762 else 763 { 764 /* Normal file name in path -- just use it. */ 765 strncpy (filename, p, len); 766 filename[len] = 0; 767 } 768 769 /* Remove trailing slashes */ 770 while (len > 0 && IS_DIR_SEPARATOR (filename[len - 1])) 771 filename[--len] = 0; 772 773 strcat (filename + len, SLASH_STRING); 774 strcat (filename, string); 775 776 if (is_regular_file (filename)) 777 { 778 fd = open (filename, mode); 779 if (fd >= 0) 780 break; 781 } 782 } 783 784done: 785 if (filename_opened) 786 { 787 /* If a file was opened, canonicalize its filename. Use xfullpath 788 rather than gdb_realpath to avoid resolving the basename part 789 of filenames when the associated file is a symbolic link. This 790 fixes a potential inconsistency between the filenames known to 791 GDB and the filenames it prints in the annotations. */ 792 if (fd < 0) 793 *filename_opened = NULL; 794 else if (IS_ABSOLUTE_PATH (filename)) 795 *filename_opened = xfullpath (filename); 796 else 797 { 798 /* Beware the // my son, the Emacs barfs, the botch that catch... */ 799 800 char *f = concat (current_directory, 801 IS_DIR_SEPARATOR (current_directory[strlen (current_directory) - 1]) 802 ? "" : SLASH_STRING, 803 filename, (char *)NULL); 804 *filename_opened = xfullpath (f); 805 xfree (f); 806 } 807 } 808 809 return fd; 810} 811 812 813/* This is essentially a convenience, for clients that want the behaviour 814 of openp, using source_path, but that really don't want the file to be 815 opened but want instead just to know what the full pathname is (as 816 qualified against source_path). 817 818 The current working directory is searched first. 819 820 If the file was found, this function returns 1, and FULL_PATHNAME is 821 set to the fully-qualified pathname. 822 823 Else, this functions returns 0, and FULL_PATHNAME is set to NULL. */ 824int 825source_full_path_of (char *filename, char **full_pathname) 826{ 827 int fd; 828 829 fd = openp (source_path, OPF_TRY_CWD_FIRST | OPF_SEARCH_IN_PATH, filename, 830 O_RDONLY, 0, full_pathname); 831 if (fd < 0) 832 { 833 *full_pathname = NULL; 834 return 0; 835 } 836 837 close (fd); 838 return 1; 839} 840 841/* Return non-zero if RULE matches PATH, that is if the rule can be 842 applied to PATH. */ 843 844static int 845substitute_path_rule_matches (const struct substitute_path_rule *rule, 846 const char *path) 847{ 848 const int from_len = strlen (rule->from); 849 const int path_len = strlen (path); 850 char *path_start; 851 852 if (path_len < from_len) 853 return 0; 854 855 /* The substitution rules are anchored at the start of the path, 856 so the path should start with rule->from. There is no filename 857 comparison routine, so we need to extract the first FROM_LEN 858 characters from PATH first and use that to do the comparison. */ 859 860 path_start = alloca (from_len + 1); 861 strncpy (path_start, path, from_len); 862 path_start[from_len] = '\0'; 863 864 if (FILENAME_CMP (path_start, rule->from) != 0) 865 return 0; 866 867 /* Make sure that the region in the path that matches the substitution 868 rule is immediately followed by a directory separator (or the end of 869 string character). */ 870 871 if (path[from_len] != '\0' && !IS_DIR_SEPARATOR (path[from_len])) 872 return 0; 873 874 return 1; 875} 876 877/* Find the substitute-path rule that applies to PATH and return it. 878 Return NULL if no rule applies. */ 879 880static struct substitute_path_rule * 881get_substitute_path_rule (const char *path) 882{ 883 struct substitute_path_rule *rule = substitute_path_rules; 884 885 while (rule != NULL && !substitute_path_rule_matches (rule, path)) 886 rule = rule->next; 887 888 return rule; 889} 890 891/* If the user specified a source path substitution rule that applies 892 to PATH, then apply it and return the new path. This new path must 893 be deallocated afterwards. 894 895 Return NULL if no substitution rule was specified by the user, 896 or if no rule applied to the given PATH. */ 897 898static char * 899rewrite_source_path (const char *path) 900{ 901 const struct substitute_path_rule *rule = get_substitute_path_rule (path); 902 char *new_path; 903 int from_len; 904 905 if (rule == NULL) 906 return NULL; 907 908 from_len = strlen (rule->from); 909 910 /* Compute the rewritten path and return it. */ 911 912 new_path = 913 (char *) xmalloc (strlen (path) + 1 + strlen (rule->to) - from_len); 914 strcpy (new_path, rule->to); 915 strcat (new_path, path + from_len); 916 917 return new_path; 918} 919 920/* This function is capable of finding the absolute path to a 921 source file, and opening it, provided you give it an 922 OBJFILE and FILENAME. Both the DIRNAME and FULLNAME are only 923 added suggestions on where to find the file. 924 925 OBJFILE should be the objfile associated with a psymtab or symtab. 926 FILENAME should be the filename to open. 927 DIRNAME is the compilation directory of a particular source file. 928 Only some debug formats provide this info. 929 FULLNAME can be the last known absolute path to the file in question. 930 931 On Success 932 A valid file descriptor is returned. ( the return value is positive ) 933 FULLNAME is set to the absolute path to the file just opened. 934 935 On Failure 936 An invalid file descriptor is returned. ( the return value is negative ) 937 FULLNAME is set to NULL. */ 938int 939find_and_open_source (struct objfile *objfile, 940 const char *filename, 941 const char *dirname, 942 char **fullname) 943{ 944 char *path = source_path; 945 const char *p; 946 int result; 947 948 /* Quick way out if we already know its full name */ 949 950 if (*fullname) 951 { 952 /* The user may have requested that source paths be rewritten 953 according to substitution rules he provided. If a substitution 954 rule applies to this path, then apply it. */ 955 char *rewritten_fullname = rewrite_source_path (*fullname); 956 957 if (rewritten_fullname != NULL) 958 { 959 xfree (*fullname); 960 *fullname = rewritten_fullname; 961 } 962 963 result = open (*fullname, OPEN_MODE); 964 if (result >= 0) 965 return result; 966 /* Didn't work -- free old one, try again. */ 967 xfree (*fullname); 968 *fullname = NULL; 969 } 970 971 if (dirname != NULL) 972 { 973 /* If necessary, rewrite the compilation directory name according 974 to the source path substitution rules specified by the user. */ 975 976 char *rewritten_dirname = rewrite_source_path (dirname); 977 978 if (rewritten_dirname != NULL) 979 { 980 make_cleanup (xfree, rewritten_dirname); 981 dirname = rewritten_dirname; 982 } 983 984 /* Replace a path entry of $cdir with the compilation directory name */ 985#define cdir_len 5 986 /* We cast strstr's result in case an ANSIhole has made it const, 987 which produces a "required warning" when assigned to a nonconst. */ 988 p = (char *) strstr (source_path, "$cdir"); 989 if (p && (p == path || p[-1] == DIRNAME_SEPARATOR) 990 && (p[cdir_len] == DIRNAME_SEPARATOR || p[cdir_len] == '\0')) 991 { 992 int len; 993 994 path = (char *) 995 alloca (strlen (source_path) + 1 + strlen (dirname) + 1); 996 len = p - source_path; 997 strncpy (path, source_path, len); /* Before $cdir */ 998 strcpy (path + len, dirname); /* new stuff */ 999 strcat (path + len, source_path + len + cdir_len); /* After $cdir */ 1000 } 1001 } 1002 else 1003 { 1004 /* If dirname is NULL, chances are the path is embedded in 1005 the filename. Try the source path substitution on it. */ 1006 char *rewritten_filename = rewrite_source_path (filename); 1007 1008 if (rewritten_filename != NULL) 1009 { 1010 make_cleanup (xfree, rewritten_filename); 1011 filename = rewritten_filename; 1012 } 1013 } 1014 1015 result = openp (path, OPF_SEARCH_IN_PATH, filename, OPEN_MODE, 0, fullname); 1016 if (result < 0) 1017 { 1018 /* Didn't work. Try using just the basename. */ 1019 p = lbasename (filename); 1020 if (p != filename) 1021 result = openp (path, OPF_SEARCH_IN_PATH, p, OPEN_MODE, 0, fullname); 1022 } 1023 1024 if (result >= 0) 1025 { 1026 char *tmp_fullname; 1027 tmp_fullname = *fullname; 1028 *fullname = xstrdup (tmp_fullname); 1029 xfree (tmp_fullname); 1030 } 1031 return result; 1032} 1033 1034/* Open a source file given a symtab S. Returns a file descriptor or 1035 negative number for error. 1036 1037 This function is a convience function to find_and_open_source. */ 1038 1039int 1040open_source_file (struct symtab *s) 1041{ 1042 if (!s) 1043 return -1; 1044 1045 return find_and_open_source (s->objfile, s->filename, s->dirname, 1046 &s->fullname); 1047} 1048 1049/* Finds the fullname that a symtab represents. 1050 1051 If this functions finds the fullname, it will save it in ps->fullname 1052 and it will also return the value. 1053 1054 If this function fails to find the file that this symtab represents, 1055 NULL will be returned and ps->fullname will be set to NULL. */ 1056char * 1057symtab_to_fullname (struct symtab *s) 1058{ 1059 int r; 1060 1061 if (!s) 1062 return NULL; 1063 1064 /* Don't check s->fullname here, the file could have been 1065 deleted/moved/..., look for it again */ 1066 r = find_and_open_source (s->objfile, s->filename, s->dirname, 1067 &s->fullname); 1068 1069 if (r) 1070 { 1071 close (r); 1072 return s->fullname; 1073 } 1074 1075 return NULL; 1076} 1077 1078/* Finds the fullname that a partial_symtab represents. 1079 1080 If this functions finds the fullname, it will save it in ps->fullname 1081 and it will also return the value. 1082 1083 If this function fails to find the file that this partial_symtab represents, 1084 NULL will be returned and ps->fullname will be set to NULL. */ 1085char * 1086psymtab_to_fullname (struct partial_symtab *ps) 1087{ 1088 int r; 1089 1090 if (!ps) 1091 return NULL; 1092 1093 /* Don't check ps->fullname here, the file could have been 1094 deleted/moved/..., look for it again */ 1095 r = find_and_open_source (ps->objfile, ps->filename, ps->dirname, 1096 &ps->fullname); 1097 1098 if (r) 1099 { 1100 close (r); 1101 return ps->fullname; 1102 } 1103 1104 return NULL; 1105} 1106 1107/* Create and initialize the table S->line_charpos that records 1108 the positions of the lines in the source file, which is assumed 1109 to be open on descriptor DESC. 1110 All set S->nlines to the number of such lines. */ 1111 1112void 1113find_source_lines (struct symtab *s, int desc) 1114{ 1115 struct stat st; 1116 char *data, *p, *end; 1117 int nlines = 0; 1118 int lines_allocated = 1000; 1119 int *line_charpos; 1120 long mtime = 0; 1121 int size; 1122 1123 gdb_assert (s); 1124 line_charpos = (int *) xmalloc (lines_allocated * sizeof (int)); 1125 if (fstat (desc, &st) < 0) 1126 perror_with_name (s->filename); 1127 1128 if (s->objfile && s->objfile->obfd) 1129 mtime = bfd_get_mtime (s->objfile->obfd); 1130 else if (exec_bfd) 1131 mtime = bfd_get_mtime (exec_bfd); 1132 1133 if (mtime && mtime < st.st_mtime) 1134 warning (_("Source file is more recent than executable.")); 1135 1136#ifdef LSEEK_NOT_LINEAR 1137 { 1138 char c; 1139 1140 /* Have to read it byte by byte to find out where the chars live */ 1141 1142 line_charpos[0] = lseek (desc, 0, SEEK_CUR); 1143 nlines = 1; 1144 while (myread (desc, &c, 1) > 0) 1145 { 1146 if (c == '\n') 1147 { 1148 if (nlines == lines_allocated) 1149 { 1150 lines_allocated *= 2; 1151 line_charpos = 1152 (int *) xrealloc ((char *) line_charpos, 1153 sizeof (int) * lines_allocated); 1154 } 1155 line_charpos[nlines++] = lseek (desc, 0, SEEK_CUR); 1156 } 1157 } 1158 } 1159#else /* lseek linear. */ 1160 { 1161 struct cleanup *old_cleanups; 1162 1163 /* st_size might be a large type, but we only support source files whose 1164 size fits in an int. */ 1165 size = (int) st.st_size; 1166 1167 /* Use malloc, not alloca, because this may be pretty large, and we may 1168 run into various kinds of limits on stack size. */ 1169 data = (char *) xmalloc (size); 1170 old_cleanups = make_cleanup (xfree, data); 1171 1172 /* Reassign `size' to result of read for systems where \r\n -> \n. */ 1173 size = myread (desc, data, size); 1174 if (size < 0) 1175 perror_with_name (s->filename); 1176 end = data + size; 1177 p = data; 1178 line_charpos[0] = 0; 1179 nlines = 1; 1180 while (p != end) 1181 { 1182 if (*p++ == '\n' 1183 /* A newline at the end does not start a new line. */ 1184 && p != end) 1185 { 1186 if (nlines == lines_allocated) 1187 { 1188 lines_allocated *= 2; 1189 line_charpos = 1190 (int *) xrealloc ((char *) line_charpos, 1191 sizeof (int) * lines_allocated); 1192 } 1193 line_charpos[nlines++] = p - data; 1194 } 1195 } 1196 do_cleanups (old_cleanups); 1197 } 1198#endif /* lseek linear. */ 1199 s->nlines = nlines; 1200 s->line_charpos = 1201 (int *) xrealloc ((char *) line_charpos, nlines * sizeof (int)); 1202 1203} 1204 1205/* Return the character position of a line LINE in symtab S. 1206 Return 0 if anything is invalid. */ 1207 1208#if 0 /* Currently unused */ 1209 1210int 1211source_line_charpos (struct symtab *s, int line) 1212{ 1213 if (!s) 1214 return 0; 1215 if (!s->line_charpos || line <= 0) 1216 return 0; 1217 if (line > s->nlines) 1218 line = s->nlines; 1219 return s->line_charpos[line - 1]; 1220} 1221 1222/* Return the line number of character position POS in symtab S. */ 1223 1224int 1225source_charpos_line (struct symtab *s, int chr) 1226{ 1227 int line = 0; 1228 int *lnp; 1229 1230 if (s == 0 || s->line_charpos == 0) 1231 return 0; 1232 lnp = s->line_charpos; 1233 /* Files are usually short, so sequential search is Ok */ 1234 while (line < s->nlines && *lnp <= chr) 1235 { 1236 line++; 1237 lnp++; 1238 } 1239 if (line >= s->nlines) 1240 line = s->nlines; 1241 return line; 1242} 1243 1244#endif /* 0 */ 1245 1246 1247/* Get full pathname and line number positions for a symtab. 1248 Return nonzero if line numbers may have changed. 1249 Set *FULLNAME to actual name of the file as found by `openp', 1250 or to 0 if the file is not found. */ 1251 1252static int 1253get_filename_and_charpos (struct symtab *s, char **fullname) 1254{ 1255 int desc, linenums_changed = 0; 1256 1257 desc = open_source_file (s); 1258 if (desc < 0) 1259 { 1260 if (fullname) 1261 *fullname = NULL; 1262 return 0; 1263 } 1264 if (fullname) 1265 *fullname = s->fullname; 1266 if (s->line_charpos == 0) 1267 linenums_changed = 1; 1268 if (linenums_changed) 1269 find_source_lines (s, desc); 1270 close (desc); 1271 return linenums_changed; 1272} 1273 1274/* Print text describing the full name of the source file S 1275 and the line number LINE and its corresponding character position. 1276 The text starts with two Ctrl-z so that the Emacs-GDB interface 1277 can easily find it. 1278 1279 MID_STATEMENT is nonzero if the PC is not at the beginning of that line. 1280 1281 Return 1 if successful, 0 if could not find the file. */ 1282 1283int 1284identify_source_line (struct symtab *s, int line, int mid_statement, 1285 CORE_ADDR pc) 1286{ 1287 if (s->line_charpos == 0) 1288 get_filename_and_charpos (s, (char **) NULL); 1289 if (s->fullname == 0) 1290 return 0; 1291 if (line > s->nlines) 1292 /* Don't index off the end of the line_charpos array. */ 1293 return 0; 1294 annotate_source (s->fullname, line, s->line_charpos[line - 1], 1295 mid_statement, pc); 1296 1297 current_source_line = line; 1298 first_line_listed = line; 1299 last_line_listed = line; 1300 current_source_symtab = s; 1301 return 1; 1302} 1303 1304 1305/* Print source lines from the file of symtab S, 1306 starting with line number LINE and stopping before line number STOPLINE. */ 1307 1308static void print_source_lines_base (struct symtab *s, int line, int stopline, 1309 int noerror); 1310static void 1311print_source_lines_base (struct symtab *s, int line, int stopline, int noerror) 1312{ 1313 int c; 1314 int desc; 1315 FILE *stream; 1316 int nlines = stopline - line; 1317 1318 /* Regardless of whether we can open the file, set current_source_symtab. */ 1319 current_source_symtab = s; 1320 current_source_line = line; 1321 first_line_listed = line; 1322 1323 /* If printing of source lines is disabled, just print file and line number */ 1324 if (ui_out_test_flags (uiout, ui_source_list)) 1325 { 1326 /* Only prints "No such file or directory" once */ 1327 if ((s != last_source_visited) || (!last_source_error)) 1328 { 1329 last_source_visited = s; 1330 desc = open_source_file (s); 1331 } 1332 else 1333 { 1334 desc = last_source_error; 1335 noerror = 1; 1336 } 1337 } 1338 else 1339 { 1340 desc = -1; 1341 noerror = 1; 1342 } 1343 1344 if (desc < 0) 1345 { 1346 last_source_error = desc; 1347 1348 if (!noerror) 1349 { 1350 char *name = alloca (strlen (s->filename) + 100); 1351 sprintf (name, "%d\t%s", line, s->filename); 1352 print_sys_errmsg (name, errno); 1353 } 1354 else 1355 ui_out_field_int (uiout, "line", line); 1356 ui_out_text (uiout, "\tin "); 1357 ui_out_field_string (uiout, "file", s->filename); 1358 ui_out_text (uiout, "\n"); 1359 1360 return; 1361 } 1362 1363 last_source_error = 0; 1364 1365 if (s->line_charpos == 0) 1366 find_source_lines (s, desc); 1367 1368 if (line < 1 || line > s->nlines) 1369 { 1370 close (desc); 1371 error (_("Line number %d out of range; %s has %d lines."), 1372 line, s->filename, s->nlines); 1373 } 1374 1375 if (lseek (desc, s->line_charpos[line - 1], 0) < 0) 1376 { 1377 close (desc); 1378 perror_with_name (s->filename); 1379 } 1380 1381 stream = fdopen (desc, FDOPEN_MODE); 1382 clearerr (stream); 1383 1384 while (nlines-- > 0) 1385 { 1386 char buf[20]; 1387 1388 c = fgetc (stream); 1389 if (c == EOF) 1390 break; 1391 last_line_listed = current_source_line; 1392 sprintf (buf, "%d\t", current_source_line++); 1393 ui_out_text (uiout, buf); 1394 do 1395 { 1396 if (c < 040 && c != '\t' && c != '\n' && c != '\r') 1397 { 1398 sprintf (buf, "^%c", c + 0100); 1399 ui_out_text (uiout, buf); 1400 } 1401 else if (c == 0177) 1402 ui_out_text (uiout, "^?"); 1403 else if (c == '\r') 1404 { 1405 /* Skip a \r character, but only before a \n. */ 1406 int c1 = fgetc (stream); 1407 1408 if (c1 != '\n') 1409 printf_filtered ("^%c", c + 0100); 1410 if (c1 != EOF) 1411 ungetc (c1, stream); 1412 } 1413 else 1414 { 1415 sprintf (buf, "%c", c); 1416 ui_out_text (uiout, buf); 1417 } 1418 } 1419 while (c != '\n' && (c = fgetc (stream)) >= 0); 1420 } 1421 1422 fclose (stream); 1423} 1424 1425/* Show source lines from the file of symtab S, starting with line 1426 number LINE and stopping before line number STOPLINE. If this is the 1427 not the command line version, then the source is shown in the source 1428 window otherwise it is simply printed */ 1429 1430void 1431print_source_lines (struct symtab *s, int line, int stopline, int noerror) 1432{ 1433 print_source_lines_base (s, line, stopline, noerror); 1434} 1435 1436/* Print info on range of pc's in a specified line. */ 1437 1438static void 1439line_info (char *arg, int from_tty) 1440{ 1441 struct symtabs_and_lines sals; 1442 struct symtab_and_line sal; 1443 CORE_ADDR start_pc, end_pc; 1444 int i; 1445 1446 init_sal (&sal); /* initialize to zeroes */ 1447 1448 if (arg == 0) 1449 { 1450 sal.symtab = current_source_symtab; 1451 sal.line = last_line_listed; 1452 sals.nelts = 1; 1453 sals.sals = (struct symtab_and_line *) 1454 xmalloc (sizeof (struct symtab_and_line)); 1455 sals.sals[0] = sal; 1456 } 1457 else 1458 { 1459 sals = decode_line_spec_1 (arg, 0); 1460 1461 dont_repeat (); 1462 } 1463 1464 /* C++ More than one line may have been specified, as when the user 1465 specifies an overloaded function name. Print info on them all. */ 1466 for (i = 0; i < sals.nelts; i++) 1467 { 1468 sal = sals.sals[i]; 1469 1470 if (sal.symtab == 0) 1471 { 1472 printf_filtered (_("No line number information available")); 1473 if (sal.pc != 0) 1474 { 1475 /* This is useful for "info line *0x7f34". If we can't tell the 1476 user about a source line, at least let them have the symbolic 1477 address. */ 1478 printf_filtered (" for address "); 1479 wrap_here (" "); 1480 print_address (sal.pc, gdb_stdout); 1481 } 1482 else 1483 printf_filtered ("."); 1484 printf_filtered ("\n"); 1485 } 1486 else if (sal.line > 0 1487 && find_line_pc_range (sal, &start_pc, &end_pc)) 1488 { 1489 if (start_pc == end_pc) 1490 { 1491 printf_filtered ("Line %d of \"%s\"", 1492 sal.line, sal.symtab->filename); 1493 wrap_here (" "); 1494 printf_filtered (" is at address "); 1495 print_address (start_pc, gdb_stdout); 1496 wrap_here (" "); 1497 printf_filtered (" but contains no code.\n"); 1498 } 1499 else 1500 { 1501 printf_filtered ("Line %d of \"%s\"", 1502 sal.line, sal.symtab->filename); 1503 wrap_here (" "); 1504 printf_filtered (" starts at address "); 1505 print_address (start_pc, gdb_stdout); 1506 wrap_here (" "); 1507 printf_filtered (" and ends at "); 1508 print_address (end_pc, gdb_stdout); 1509 printf_filtered (".\n"); 1510 } 1511 1512 /* x/i should display this line's code. */ 1513 set_next_address (start_pc); 1514 1515 /* Repeating "info line" should do the following line. */ 1516 last_line_listed = sal.line + 1; 1517 1518 /* If this is the only line, show the source code. If it could 1519 not find the file, don't do anything special. */ 1520 if (annotation_level && sals.nelts == 1) 1521 identify_source_line (sal.symtab, sal.line, 0, start_pc); 1522 } 1523 else 1524 /* Is there any case in which we get here, and have an address 1525 which the user would want to see? If we have debugging symbols 1526 and no line numbers? */ 1527 printf_filtered (_("Line number %d is out of range for \"%s\".\n"), 1528 sal.line, sal.symtab->filename); 1529 } 1530 xfree (sals.sals); 1531} 1532 1533/* Commands to search the source file for a regexp. */ 1534 1535static void 1536forward_search_command (char *regex, int from_tty) 1537{ 1538 int c; 1539 int desc; 1540 FILE *stream; 1541 int line; 1542 char *msg; 1543 1544 line = last_line_listed + 1; 1545 1546 msg = (char *) re_comp (regex); 1547 if (msg) 1548 error (("%s"), msg); 1549 1550 if (current_source_symtab == 0) 1551 select_source_symtab (0); 1552 1553 desc = open_source_file (current_source_symtab); 1554 if (desc < 0) 1555 perror_with_name (current_source_symtab->filename); 1556 1557 if (current_source_symtab->line_charpos == 0) 1558 find_source_lines (current_source_symtab, desc); 1559 1560 if (line < 1 || line > current_source_symtab->nlines) 1561 { 1562 close (desc); 1563 error (_("Expression not found")); 1564 } 1565 1566 if (lseek (desc, current_source_symtab->line_charpos[line - 1], 0) < 0) 1567 { 1568 close (desc); 1569 perror_with_name (current_source_symtab->filename); 1570 } 1571 1572 stream = fdopen (desc, FDOPEN_MODE); 1573 clearerr (stream); 1574 while (1) 1575 { 1576 static char *buf = NULL; 1577 char *p; 1578 int cursize, newsize; 1579 1580 cursize = 256; 1581 buf = xmalloc (cursize); 1582 p = buf; 1583 1584 c = getc (stream); 1585 if (c == EOF) 1586 break; 1587 do 1588 { 1589 *p++ = c; 1590 if (p - buf == cursize) 1591 { 1592 newsize = cursize + cursize / 2; 1593 buf = xrealloc (buf, newsize); 1594 p = buf + cursize; 1595 cursize = newsize; 1596 } 1597 } 1598 while (c != '\n' && (c = getc (stream)) >= 0); 1599 1600 /* Remove the \r, if any, at the end of the line, otherwise 1601 regular expressions that end with $ or \n won't work. */ 1602 if (p - buf > 1 && p[-2] == '\r') 1603 { 1604 p--; 1605 p[-1] = '\n'; 1606 } 1607 1608 /* we now have a source line in buf, null terminate and match */ 1609 *p = 0; 1610 if (re_exec (buf) > 0) 1611 { 1612 /* Match! */ 1613 fclose (stream); 1614 print_source_lines (current_source_symtab, line, line + 1, 0); 1615 set_internalvar (lookup_internalvar ("_"), 1616 value_from_longest (builtin_type_int, 1617 (LONGEST) line)); 1618 current_source_line = max (line - lines_to_list / 2, 1); 1619 return; 1620 } 1621 line++; 1622 } 1623 1624 printf_filtered (_("Expression not found\n")); 1625 fclose (stream); 1626} 1627 1628static void 1629reverse_search_command (char *regex, int from_tty) 1630{ 1631 int c; 1632 int desc; 1633 FILE *stream; 1634 int line; 1635 char *msg; 1636 1637 line = last_line_listed - 1; 1638 1639 msg = (char *) re_comp (regex); 1640 if (msg) 1641 error (("%s"), msg); 1642 1643 if (current_source_symtab == 0) 1644 select_source_symtab (0); 1645 1646 desc = open_source_file (current_source_symtab); 1647 if (desc < 0) 1648 perror_with_name (current_source_symtab->filename); 1649 1650 if (current_source_symtab->line_charpos == 0) 1651 find_source_lines (current_source_symtab, desc); 1652 1653 if (line < 1 || line > current_source_symtab->nlines) 1654 { 1655 close (desc); 1656 error (_("Expression not found")); 1657 } 1658 1659 if (lseek (desc, current_source_symtab->line_charpos[line - 1], 0) < 0) 1660 { 1661 close (desc); 1662 perror_with_name (current_source_symtab->filename); 1663 } 1664 1665 stream = fdopen (desc, FDOPEN_MODE); 1666 clearerr (stream); 1667 while (line > 1) 1668 { 1669/* FIXME!!! We walk right off the end of buf if we get a long line!!! */ 1670 char buf[4096]; /* Should be reasonable??? */ 1671 char *p = buf; 1672 1673 c = getc (stream); 1674 if (c == EOF) 1675 break; 1676 do 1677 { 1678 *p++ = c; 1679 } 1680 while (c != '\n' && (c = getc (stream)) >= 0); 1681 1682 /* Remove the \r, if any, at the end of the line, otherwise 1683 regular expressions that end with $ or \n won't work. */ 1684 if (p - buf > 1 && p[-2] == '\r') 1685 { 1686 p--; 1687 p[-1] = '\n'; 1688 } 1689 1690 /* We now have a source line in buf; null terminate and match. */ 1691 *p = 0; 1692 if (re_exec (buf) > 0) 1693 { 1694 /* Match! */ 1695 fclose (stream); 1696 print_source_lines (current_source_symtab, line, line + 1, 0); 1697 set_internalvar (lookup_internalvar ("_"), 1698 value_from_longest (builtin_type_int, 1699 (LONGEST) line)); 1700 current_source_line = max (line - lines_to_list / 2, 1); 1701 return; 1702 } 1703 line--; 1704 if (fseek (stream, current_source_symtab->line_charpos[line - 1], 0) < 0) 1705 { 1706 fclose (stream); 1707 perror_with_name (current_source_symtab->filename); 1708 } 1709 } 1710 1711 printf_filtered (_("Expression not found\n")); 1712 fclose (stream); 1713 return; 1714} 1715 1716/* If the last character of PATH is a directory separator, then strip it. */ 1717 1718static void 1719strip_trailing_directory_separator (char *path) 1720{ 1721 const int last = strlen (path) - 1; 1722 1723 if (last < 0) 1724 return; /* No stripping is needed if PATH is the empty string. */ 1725 1726 if (IS_DIR_SEPARATOR (path[last])) 1727 path[last] = '\0'; 1728} 1729 1730/* Return the path substitution rule that matches FROM. 1731 Return NULL if no rule matches. */ 1732 1733static struct substitute_path_rule * 1734find_substitute_path_rule (const char *from) 1735{ 1736 struct substitute_path_rule *rule = substitute_path_rules; 1737 1738 while (rule != NULL) 1739 { 1740 if (FILENAME_CMP (rule->from, from) == 0) 1741 return rule; 1742 rule = rule->next; 1743 } 1744 1745 return NULL; 1746} 1747 1748/* Add a new substitute-path rule at the end of the current list of rules. 1749 The new rule will replace FROM into TO. */ 1750 1751static void 1752add_substitute_path_rule (char *from, char *to) 1753{ 1754 struct substitute_path_rule *rule; 1755 struct substitute_path_rule *new_rule; 1756 1757 new_rule = xmalloc (sizeof (struct substitute_path_rule)); 1758 new_rule->from = xstrdup (from); 1759 new_rule->to = xstrdup (to); 1760 new_rule->next = NULL; 1761 1762 /* If the list of rules are empty, then insert the new rule 1763 at the head of the list. */ 1764 1765 if (substitute_path_rules == NULL) 1766 { 1767 substitute_path_rules = new_rule; 1768 return; 1769 } 1770 1771 /* Otherwise, skip to the last rule in our list and then append 1772 the new rule. */ 1773 1774 rule = substitute_path_rules; 1775 while (rule->next != NULL) 1776 rule = rule->next; 1777 1778 rule->next = new_rule; 1779} 1780 1781/* Remove the given source path substitution rule from the current list 1782 of rules. The memory allocated for that rule is also deallocated. */ 1783 1784static void 1785delete_substitute_path_rule (struct substitute_path_rule *rule) 1786{ 1787 if (rule == substitute_path_rules) 1788 substitute_path_rules = rule->next; 1789 else 1790 { 1791 struct substitute_path_rule *prev = substitute_path_rules; 1792 1793 while (prev != NULL && prev->next != rule) 1794 prev = prev->next; 1795 1796 gdb_assert (prev != NULL); 1797 1798 prev->next = rule->next; 1799 } 1800 1801 xfree (rule->from); 1802 xfree (rule->to); 1803 xfree (rule); 1804} 1805 1806/* Implement the "show substitute-path" command. */ 1807 1808static void 1809show_substitute_path_command (char *args, int from_tty) 1810{ 1811 struct substitute_path_rule *rule = substitute_path_rules; 1812 char **argv; 1813 char *from = NULL; 1814 1815 argv = buildargv (args); 1816 make_cleanup_freeargv (argv); 1817 1818 /* We expect zero or one argument. */ 1819 1820 if (argv != NULL && argv[0] != NULL && argv[1] != NULL) 1821 error (_("Too many arguments in command")); 1822 1823 if (argv != NULL && argv[0] != NULL) 1824 from = argv[0]; 1825 1826 /* Print the substitution rules. */ 1827 1828 if (from != NULL) 1829 printf_filtered 1830 (_("Source path substitution rule matching `%s':\n"), from); 1831 else 1832 printf_filtered (_("List of all source path substitution rules:\n")); 1833 1834 while (rule != NULL) 1835 { 1836 if (from == NULL || FILENAME_CMP (rule->from, from) == 0) 1837 printf_filtered (" `%s' -> `%s'.\n", rule->from, rule->to); 1838 rule = rule->next; 1839 } 1840} 1841 1842/* Implement the "unset substitute-path" command. */ 1843 1844static void 1845unset_substitute_path_command (char *args, int from_tty) 1846{ 1847 struct substitute_path_rule *rule = substitute_path_rules; 1848 char **argv = buildargv (args); 1849 char *from = NULL; 1850 int rule_found = 0; 1851 1852 /* This function takes either 0 or 1 argument. */ 1853 1854 make_cleanup_freeargv (argv); 1855 if (argv != NULL && argv[0] != NULL && argv[1] != NULL) 1856 error (_("Incorrect usage, too many arguments in command")); 1857 1858 if (argv != NULL && argv[0] != NULL) 1859 from = argv[0]; 1860 1861 /* If the user asked for all the rules to be deleted, ask him 1862 to confirm and give him a chance to abort before the action 1863 is performed. */ 1864 1865 if (from == NULL 1866 && !query (_("Delete all source path substitution rules? "))) 1867 error (_("Canceled")); 1868 1869 /* Delete the rule matching the argument. No argument means that 1870 all rules should be deleted. */ 1871 1872 while (rule != NULL) 1873 { 1874 struct substitute_path_rule *next = rule->next; 1875 1876 if (from == NULL || FILENAME_CMP (from, rule->from) == 0) 1877 { 1878 delete_substitute_path_rule (rule); 1879 rule_found = 1; 1880 } 1881 1882 rule = next; 1883 } 1884 1885 /* If the user asked for a specific rule to be deleted but 1886 we could not find it, then report an error. */ 1887 1888 if (from != NULL && !rule_found) 1889 error (_("No substitution rule defined for `%s'"), from); 1890} 1891 1892/* Add a new source path substitution rule. */ 1893 1894static void 1895set_substitute_path_command (char *args, int from_tty) 1896{ 1897 char *from_path, *to_path; 1898 char **argv; 1899 struct substitute_path_rule *rule; 1900 1901 argv = buildargv (args); 1902 make_cleanup_freeargv (argv); 1903 1904 if (argv == NULL || argv[0] == NULL || argv [1] == NULL) 1905 error (_("Incorrect usage, too few arguments in command")); 1906 1907 if (argv[2] != NULL) 1908 error (_("Incorrect usage, too many arguments in command")); 1909 1910 if (*(argv[0]) == '\0') 1911 error (_("First argument must be at least one character long")); 1912 1913 /* Strip any trailing directory separator character in either FROM 1914 or TO. The substitution rule already implicitly contains them. */ 1915 strip_trailing_directory_separator (argv[0]); 1916 strip_trailing_directory_separator (argv[1]); 1917 1918 /* If a rule with the same "from" was previously defined, then 1919 delete it. This new rule replaces it. */ 1920 1921 rule = find_substitute_path_rule (argv[0]); 1922 if (rule != NULL) 1923 delete_substitute_path_rule (rule); 1924 1925 /* Insert the new substitution rule. */ 1926 1927 add_substitute_path_rule (argv[0], argv[1]); 1928} 1929 1930 1931void 1932_initialize_source (void) 1933{ 1934 struct cmd_list_element *c; 1935 current_source_symtab = 0; 1936 init_source_path (); 1937 1938 /* The intention is to use POSIX Basic Regular Expressions. 1939 Always use the GNU regex routine for consistency across all hosts. 1940 Our current GNU regex.c does not have all the POSIX features, so this is 1941 just an approximation. */ 1942 re_set_syntax (RE_SYNTAX_GREP); 1943 1944 c = add_cmd ("directory", class_files, directory_command, _("\ 1945Add directory DIR to beginning of search path for source files.\n\ 1946Forget cached info on source file locations and line positions.\n\ 1947DIR can also be $cwd for the current working directory, or $cdir for the\n\ 1948directory in which the source file was compiled into object code.\n\ 1949With no argument, reset the search path to $cdir:$cwd, the default."), 1950 &cmdlist); 1951 1952 if (dbx_commands) 1953 add_com_alias ("use", "directory", class_files, 0); 1954 1955 set_cmd_completer (c, filename_completer); 1956 1957 add_cmd ("directories", no_class, show_directories, _("\ 1958Current search path for finding source files.\n\ 1959$cwd in the path means the current working directory.\n\ 1960$cdir in the path means the compilation directory of the source file."), 1961 &showlist); 1962 1963 if (xdb_commands) 1964 { 1965 add_com_alias ("D", "directory", class_files, 0); 1966 add_cmd ("ld", no_class, show_directories, _("\ 1967Current search path for finding source files.\n\ 1968$cwd in the path means the current working directory.\n\ 1969$cdir in the path means the compilation directory of the source file."), 1970 &cmdlist); 1971 } 1972 1973 add_info ("source", source_info, 1974 _("Information about the current source file.")); 1975 1976 add_info ("line", line_info, _("\ 1977Core addresses of the code for a source line.\n\ 1978Line can be specified as\n\ 1979 LINENUM, to list around that line in current file,\n\ 1980 FILE:LINENUM, to list around that line in that file,\n\ 1981 FUNCTION, to list around beginning of that function,\n\ 1982 FILE:FUNCTION, to distinguish among like-named static functions.\n\ 1983Default is to describe the last source line that was listed.\n\n\ 1984This sets the default address for \"x\" to the line's first instruction\n\ 1985so that \"x/i\" suffices to start examining the machine code.\n\ 1986The address is also stored as the value of \"$_\".")); 1987 1988 add_com ("forward-search", class_files, forward_search_command, _("\ 1989Search for regular expression (see regex(3)) from last line listed.\n\ 1990The matching line number is also stored as the value of \"$_\".")); 1991 add_com_alias ("search", "forward-search", class_files, 0); 1992 1993 add_com ("reverse-search", class_files, reverse_search_command, _("\ 1994Search backward for regular expression (see regex(3)) from last line listed.\n\ 1995The matching line number is also stored as the value of \"$_\".")); 1996 1997 if (xdb_commands) 1998 { 1999 add_com_alias ("/", "forward-search", class_files, 0); 2000 add_com_alias ("?", "reverse-search", class_files, 0); 2001 } 2002 2003 add_setshow_integer_cmd ("listsize", class_support, &lines_to_list, _("\ 2004Set number of source lines gdb will list by default."), _("\ 2005Show number of source lines gdb will list by default."), NULL, 2006 NULL, 2007 show_lines_to_list, 2008 &setlist, &showlist); 2009 2010 add_cmd ("substitute-path", class_files, set_substitute_path_command, 2011 _("\ 2012Usage: set substitute-path FROM TO\n\ 2013Add a substitution rule replacing FROM into TO in source file names.\n\ 2014If a substitution rule was previously set for FROM, the old rule\n\ 2015is replaced by the new one."), 2016 &setlist); 2017 2018 add_cmd ("substitute-path", class_files, unset_substitute_path_command, 2019 _("\ 2020Usage: unset substitute-path [FROM]\n\ 2021Delete the rule for substituting FROM in source file names. If FROM\n\ 2022is not specified, all substituting rules are deleted.\n\ 2023If the debugger cannot find a rule for FROM, it will display a warning."), 2024 &unsetlist); 2025 2026 add_cmd ("substitute-path", class_files, show_substitute_path_command, 2027 _("\ 2028Usage: show substitute-path [FROM]\n\ 2029Print the rule for substituting FROM in source file names. If FROM\n\ 2030is not specified, print all substitution rules."), 2031 &showlist); 2032} 2033