binutils/addr2line.c

   1 /* addr2line.c -- convert addresses to line number and function name
   2    Copyright (C) 1997-2022 Free Software Foundation, Inc.
   3    Contributed by Ulrich Lauther <Ulrich.Lauther@mchp.siemens.de>
   4
   5    This file is part of GNU Binutils.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3, or (at your option)
  10    any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, 51 Franklin Street - Fifth Floor, Boston,
  20    MA 02110-1301, USA.  */
  21
  22
  23 /* Derived from objdump.c and nm.c by Ulrich.Lauther@mchp.siemens.de
  24
  25    Usage:
  26    addr2line [options] addr addr ...
  27    or
  28    addr2line [options]
  29
  30    both forms write results to stdout, the second form reads addresses
  31    to be converted from stdin.  */
  32
  33 #include "sysdep.h"
  34 #include "bfd.h"
  35 #include "getopt.h"
  36 #include "libiberty.h"
  37 #include "demangle.h"
  38 #include "bucomm.h"
  39 #include "elf-bfd.h"
  40 #include "safe-ctype.h"
  41
  42 static bool unwind_inlines;     /* -i, unwind inlined functions. */
  43 static bool with_addresses;     /* -a, show addresses.  */
  44 static bool with_functions;     /* -f, show function names.  */
  45 static bool do_demangle;        /* -C, demangle names.  */
  46 static bool pretty_print;       /* -p, print on one line.  */
  47 static bool base_names;         /* -s, strip directory names.  */
  48
  49 /* Flags passed to the name demangler.  */
  50 static int demangle_flags = DMGL_PARAMS | DMGL_ANSI;
  51
  52 static int naddr;               /* Number of addresses to process.  */
  53 static char **addr;             /* Hex addresses to process.  */
  54
  55 static long symcount;
  56 static asymbol **syms;          /* Symbol table.  */
  57
  58 static struct option long_options[] =
  59 {
  60   {"addresses", no_argument, NULL, 'a'},
  61   {"basenames", no_argument, NULL, 's'},
  62   {"demangle", optional_argument, NULL, 'C'},
  63   {"exe", required_argument, NULL, 'e'},
  64   {"functions", no_argument, NULL, 'f'},
  65   {"inlines", no_argument, NULL, 'i'},
  66   {"pretty-print", no_argument, NULL, 'p'},
  67   {"recurse-limit", no_argument, NULL, 'R'},
  68   {"recursion-limit", no_argument, NULL, 'R'},
  69   {"no-recurse-limit", no_argument, NULL, 'r'},
  70   {"no-recursion-limit", no_argument, NULL, 'r'},
  71   {"section", required_argument, NULL, 'j'},
  72   {"target", required_argument, NULL, 'b'},
  73   {"help", no_argument, NULL, 'H'},
  74   {"version", no_argument, NULL, 'V'},
  75   {0, no_argument, 0, 0}
  76 };
  77
  78 static void usage (FILE *, int);
  79 static void slurp_symtab (bfd *);
  80 static void find_address_in_section (bfd *, asection *, void *);
  81 static void find_offset_in_section (bfd *, asection *);
  82 static void translate_addresses (bfd *, asection *);
  83 \f
  84 /* Print a usage message to STREAM and exit with STATUS.  */
  85
  86 static void
  87 usage (FILE *stream, int status)
  88 {
  89   fprintf (stream, _("Usage: %s [option(s)] [addr(s)]\n"), program_name);
  90   fprintf (stream, _(" Convert addresses into line number/file name pairs.\n"));
  91   fprintf (stream, _(" If no addresses are specified on the command line, they will be read from stdin\n"));
  92   fprintf (stream, _(" The options are:\n\
  93   @<file>                Read options from <file>\n\
  94   -a --addresses         Show addresses\n\
  95   -b --target=<bfdname>  Set the binary file format\n\
  96   -e --exe=<executable>  Set the input file name (default is a.out)\n\
  97   -i --inlines           Unwind inlined functions\n\
  98   -j --section=<name>    Read section-relative offsets instead of addresses\n\
  99   -p --pretty-print      Make the output easier to read for humans\n\
 100   -s --basenames         Strip directory names\n\
 101   -f --functions         Show function names\n\
 102   -C --demangle[=style]  Demangle function names\n\
 103   -R --recurse-limit     Enable a limit on recursion whilst demangling.  [Default]\n\
 104   -r --no-recurse-limit  Disable a limit on recursion whilst demangling\n\
 105   -h --help              Display this information\n\
 106   -v --version           Display the program's version\n\
 107 \n"));
 108
 109   list_supported_targets (program_name, stream);
 110   if (REPORT_BUGS_TO[0] && status == 0)
 111     fprintf (stream, _("Report bugs to %s\n"), REPORT_BUGS_TO);
 112   exit (status);
 113 }
 114 \f
 115 /* Read in the symbol table.  */
 116
 117 static void
 118 slurp_symtab (bfd *abfd)
 119 {
 120   long storage;
 121   bool dynamic = false;
 122
 123   if ((bfd_get_file_flags (abfd) & HAS_SYMS) == 0)
 124     return;
 125
 126   storage = bfd_get_symtab_upper_bound (abfd);
 127   if (storage == 0)
 128     {
 129       storage = bfd_get_dynamic_symtab_upper_bound (abfd);
 130       dynamic = true;
 131     }
 132   if (storage < 0)
 133     bfd_fatal (bfd_get_filename (abfd));
 134
 135   syms = (asymbol **) xmalloc (storage);
 136   if (dynamic)
 137     symcount = bfd_canonicalize_dynamic_symtab (abfd, syms);
 138   else
 139     symcount = bfd_canonicalize_symtab (abfd, syms);
 140   if (symcount < 0)
 141     bfd_fatal (bfd_get_filename (abfd));
 142
 143   /* If there are no symbols left after canonicalization and
 144      we have not tried the dynamic symbols then give them a go.  */
 145   if (symcount == 0
 146       && ! dynamic
 147       && (storage = bfd_get_dynamic_symtab_upper_bound (abfd)) > 0)
 148     {
 149       free (syms);
 150       syms = xmalloc (storage);
 151       symcount = bfd_canonicalize_dynamic_symtab (abfd, syms);
 152     }
 153
 154   /* PR 17512: file: 2a1d3b5b.
 155      Do not pretend that we have some symbols when we don't.  */
 156   if (symcount <= 0)
 157     {
 158       free (syms);
 159       syms = NULL;
 160     }
 161 }
 162 \f
 163 /* These global variables are used to pass information between
 164    translate_addresses and find_address_in_section.  */
 165
 166 static bfd_vma pc;
 167 static const char *filename;
 168 static const char *functionname;
 169 static unsigned int line;
 170 static unsigned int discriminator;
 171 static bool found;
 172
 173 /* Look for an address in a section.  This is called via
 174    bfd_map_over_sections.  */
 175
 176 static void
 177 find_address_in_section (bfd *abfd, asection *section,
 178                          void *data ATTRIBUTE_UNUSED)
 179 {
 180   bfd_vma vma;
 181   bfd_size_type size;
 182
 183   if (found)
 184     return;
 185
 186   if ((bfd_section_flags (section) & SEC_ALLOC) == 0)
 187     return;
 188
 189   vma = bfd_section_vma (section);
 190   if (pc < vma)
 191     return;
 192
 193   size = bfd_section_size (section);
 194   if (pc >= vma + size)
 195     return;
 196
 197   found = bfd_find_nearest_line_discriminator (abfd, section, syms, pc - vma,
 198                                                &filename, &functionname,
 199                                                &line, &discriminator);
 200 }
 201
 202 /* Look for an offset in a section.  This is directly called.  */
 203
 204 static void
 205 find_offset_in_section (bfd *abfd, asection *section)
 206 {
 207   bfd_size_type size;
 208
 209   if (found)
 210     return;
 211
 212   if ((bfd_section_flags (section) & SEC_ALLOC) == 0)
 213     return;
 214
 215   size = bfd_section_size (section);
 216   if (pc >= size)
 217     return;
 218
 219   found = bfd_find_nearest_line_discriminator (abfd, section, syms, pc,
 220                                                &filename, &functionname,
 221                                                &line, &discriminator);
 222 }
 223
 224 /* Lookup a symbol with offset in symbol table.  */
 225
 226 static bfd_vma
 227 lookup_symbol (bfd *abfd, char *sym, size_t offset)
 228 {
 229   long i;
 230
 231   for (i = 0; i < symcount; i++)
 232     {
 233       if (!strcmp (syms[i]->name, sym))
 234         return syms[i]->value + offset + bfd_asymbol_section (syms[i])->vma;
 235     }
 236   /* Try again mangled */
 237   for (i = 0; i < symcount; i++)
 238     {
 239       char *d = bfd_demangle (abfd, syms[i]->name, demangle_flags);
 240       bool match = d && !strcmp (d, sym);
 241       free (d);
 242
 243       if (match)
 244         return syms[i]->value + offset + bfd_asymbol_section (syms[i])->vma;
 245     }
 246   return 0;
 247 }
 248
 249 /* Split an symbol+offset expression. adr is modified.  */
 250
 251 static bool
 252 is_symbol (char *adr, char **symp, size_t *offset)
 253 {
 254   char *end;
 255
 256   while (ISSPACE (*adr))
 257     adr++;
 258   if (ISDIGIT (*adr) || *adr == 0)
 259     return false;
 260   /* Could be either symbol or hex number. Check if it has +.  */
 261   if (TOUPPER(*adr) >= 'A' && TOUPPER(*adr) <= 'F' && !strchr (adr, '+'))
 262     return false;
 263
 264   *symp = adr;
 265   while (*adr && !ISSPACE (*adr) && *adr != '+')
 266     adr++;
 267   end = adr;
 268   while (ISSPACE (*adr))
 269     adr++;
 270   *offset = 0;
 271   if (*adr == '+')
 272     {
 273       adr++;
 274       *offset = strtoul(adr, NULL, 0);
 275     }
 276   *end = 0;
 277   return true;
 278 }
 279
 280 /* Read hexadecimal or symbolic with offset addresses from stdin, translate into
 281    file_name:line_number and optionally function name.  */
 282
 283 static void
 284 translate_addresses (bfd *abfd, asection *section)
 285 {
 286   int read_stdin = (naddr == 0);
 287   char *adr;
 288   char addr_hex[100];
 289   char *symp;
 290   size_t offset;
 291
 292   for (;;)
 293     {
 294       if (read_stdin)
 295         {
 296           if (fgets (addr_hex, sizeof addr_hex, stdin) == NULL)
 297             break;
 298           adr = addr_hex;
 299         }
 300       else
 301         {
 302           if (naddr <= 0)
 303             break;
 304           --naddr;
 305           adr = *addr++;
 306         }
 307
 308       if (is_symbol (adr, &symp, &offset))
 309         pc = lookup_symbol (abfd, symp, offset);
 310       else
 311         pc = bfd_scan_vma (adr, NULL, 16);
 312       if (bfd_get_flavour (abfd) == bfd_target_elf_flavour)
 313         {
 314           const struct elf_backend_data *bed = get_elf_backend_data (abfd);
 315           bfd_vma sign = (bfd_vma) 1 << (bed->s->arch_size - 1);
 316
 317           pc &= (sign << 1) - 1;
 318           if (bed->sign_extend_vma)
 319             pc = (pc ^ sign) - sign;
 320         }
 321
 322       if (with_addresses)
 323         {
 324           printf ("0x");
 325           bfd_printf_vma (abfd, pc);
 326
 327           if (pretty_print)
 328             printf (": ");
 329           else
 330             printf ("\n");
 331         }
 332
 333       found = false;
 334       if (section)
 335         find_offset_in_section (abfd, section);
 336       else
 337         bfd_map_over_sections (abfd, find_address_in_section, NULL);
 338
 339       if (! found)
 340         {
 341           if (with_functions)
 342             {
 343               if (pretty_print)
 344                 printf ("?? ");
 345               else
 346                 printf ("??\n");
 347             }
 348           printf ("??:0\n");
 349         }
 350       else
 351         {
 352           while (1)
 353             {
 354               if (with_functions)
 355                 {
 356                   const char *name;
 357                   char *alloc = NULL;
 358
 359                   name = functionname;
 360                   if (name == NULL || *name == '\0')
 361                     name = "??";
 362                   else if (do_demangle)
 363                     {
 364                       alloc = bfd_demangle (abfd, name, demangle_flags);
 365                       if (alloc != NULL)
 366                         name = alloc;
 367                     }
 368
 369                   printf ("%s", name);
 370                   if (pretty_print)
 371                     /* Note for translators:  This printf is used to join the
 372                        function name just printed above to the line number/
 373                        file name pair that is about to be printed below.  Eg:
 374
 375                          foo at 123:bar.c  */
 376                     printf (_(" at "));
 377                   else
 378                     printf ("\n");
 379
 380                   free (alloc);
 381                 }
 382
 383               if (base_names && filename != NULL)
 384                 {
 385                   char *h;
 386
 387                   h = strrchr (filename, '/');
 388                   if (h != NULL)
 389                     filename = h + 1;
 390                 }
 391
 392               printf ("%s:", filename ? filename : "??");
 393               if (line != 0)
 394                 {
 395                   if (discriminator != 0)
 396                     printf ("%u (discriminator %u)\n", line, discriminator);
 397                   else
 398                     printf ("%u\n", line);
 399                 }
 400               else
 401                 printf ("?\n");
 402               if (!unwind_inlines)
 403                 found = false;
 404               else
 405                 found = bfd_find_inliner_info (abfd, &filename, &functionname,
 406                                                &line);
 407               if (! found)
 408                 break;
 409               if (pretty_print)
 410                 /* Note for translators: This printf is used to join the
 411                    line number/file name pair that has just been printed with
 412                    the line number/file name pair that is going to be printed
 413                    by the next iteration of the while loop.  Eg:
 414
 415                      123:bar.c (inlined by) 456:main.c  */
 416                 printf (_(" (inlined by) "));
 417             }
 418         }
 419
 420       /* fflush() is essential for using this command as a server
 421          child process that reads addresses from a pipe and responds
 422          with line number information, processing one address at a
 423          time.  */
 424       fflush (stdout);
 425     }
 426 }
 427
 428 /* Process a file.  Returns an exit value for main().  */
 429
 430 static int
 431 process_file (const char *file_name, const char *section_name,
 432               const char *target)
 433 {
 434   bfd *abfd;
 435   asection *section;
 436   char **matching;
 437
 438   if (get_file_size (file_name) < 1)
 439     return 1;
 440
 441   abfd = bfd_openr (file_name, target);
 442   if (abfd == NULL)
 443     bfd_fatal (file_name);
 444
 445   /* Decompress sections.  */
 446   abfd->flags |= BFD_DECOMPRESS;
 447
 448   if (bfd_check_format (abfd, bfd_archive))
 449     fatal (_("%s: cannot get addresses from archive"), file_name);
 450
 451   if (! bfd_check_format_matches (abfd, bfd_object, &matching))
 452     {
 453       bfd_nonfatal (bfd_get_filename (abfd));
 454       if (bfd_get_error () == bfd_error_file_ambiguously_recognized)
 455         list_matching_formats (matching);
 456       xexit (1);
 457     }
 458
 459   if (section_name != NULL)
 460     {
 461       section = bfd_get_section_by_name (abfd, section_name);
 462       if (section == NULL)
 463         fatal (_("%s: cannot find section %s"), file_name, section_name);
 464     }
 465   else
 466     section = NULL;
 467
 468   slurp_symtab (abfd);
 469
 470   translate_addresses (abfd, section);
 471
 472   free (syms);
 473   syms = NULL;
 474
 475   bfd_close (abfd);
 476
 477   return 0;
 478 }
 479 \f
 480 int
 481 main (int argc, char **argv)
 482 {
 483   const char *file_name;
 484   const char *section_name;
 485   char *target;
 486   int c;
 487
 488 #ifdef HAVE_LC_MESSAGES
 489   setlocale (LC_MESSAGES, "");
 490 #endif
 491   setlocale (LC_CTYPE, "");
 492   bindtextdomain (PACKAGE, LOCALEDIR);
 493   textdomain (PACKAGE);
 494
 495   program_name = *argv;
 496   xmalloc_set_program_name (program_name);
 497   bfd_set_error_program_name (program_name);
 498
 499   expandargv (&argc, &argv);
 500
 501   if (bfd_init () != BFD_INIT_MAGIC)
 502     fatal (_("fatal error: libbfd ABI mismatch"));
 503   set_default_bfd_target ();
 504
 505   file_name = NULL;
 506   section_name = NULL;
 507   target = NULL;
 508   while ((c = getopt_long (argc, argv, "ab:Ce:rRsfHhij:pVv", long_options, (int *) 0))
 509          != EOF)
 510     {
 511       switch (c)
 512         {
 513         case 0:
 514           break;                /* We've been given a long option.  */
 515         case 'a':
 516           with_addresses = true;
 517           break;
 518         case 'b':
 519           target = optarg;
 520           break;
 521         case 'C':
 522           do_demangle = true;
 523           if (optarg != NULL)
 524             {
 525               enum demangling_styles style;
 526
 527               style = cplus_demangle_name_to_style (optarg);
 528               if (style == unknown_demangling)
 529                 fatal (_("unknown demangling style `%s'"),
 530                        optarg);
 531
 532               cplus_demangle_set_style (style);
 533             }
 534           break;
 535         case 'r':
 536           demangle_flags |= DMGL_NO_RECURSE_LIMIT;
 537           break;
 538         case 'R':
 539           demangle_flags &= ~ DMGL_NO_RECURSE_LIMIT;
 540           break;
 541         case 'e':
 542           file_name = optarg;
 543           break;
 544         case 's':
 545           base_names = true;
 546           break;
 547         case 'f':
 548           with_functions = true;
 549           break;
 550         case 'p':
 551           pretty_print = true;
 552           break;
 553         case 'v':
 554         case 'V':
 555           print_version ("addr2line");
 556           break;
 557         case 'h':
 558         case 'H':
 559           usage (stdout, 0);
 560           break;
 561         case 'i':
 562           unwind_inlines = true;
 563           break;
 564         case 'j':
 565           section_name = optarg;
 566           break;
 567         default:
 568           usage (stderr, 1);
 569           break;
 570         }
 571     }
 572
 573   if (file_name == NULL)
 574     file_name = "a.out";
 575
 576   addr = argv + optind;
 577   naddr = argc - optind;
 578
 579   return process_file (file_name, section_name, target);
 580 }