ld/ldmisc.c

   1 /* ldmisc.c
   2    Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
   3    2001, 2002, 2003, 2004, 2005
   4    Free Software Foundation, Inc.
   5    Written by Steve Chamberlain of Cygnus Support.
   6
   7    This file is part of GLD, the Gnu Linker.
   8
   9    GLD is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2, or (at your option)
  12    any later version.
  13
  14    GLD is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with GLD; see the file COPYING.  If not, write to the Free
  21    Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
  22    02110-1301, USA.  */
  23
  24 #include "bfd.h"
  25 #include "bfdlink.h"
  26 #include "sysdep.h"
  27 #include "libiberty.h"
  28 #include "demangle.h"
  29 #include <stdarg.h>
  30 #include "ld.h"
  31 #include "ldmisc.h"
  32 #include "ldexp.h"
  33 #include "ldlang.h"
  34 #include <ldgram.h>
  35 #include "ldlex.h"
  36 #include "ldmain.h"
  37 #include "ldfile.h"
  38 #include "elf-bfd.h"
  39
  40 /*
  41  %% literal %
  42  %A section name from a section
  43  %B filename from a bfd
  44  %C clever filename:linenumber with function
  45  %D like %C, but no function name
  46  %E current bfd error or errno
  47  %F error is fatal
  48  %G like %D, but only function name
  49  %I filename from a lang_input_statement_type
  50  %P print program name
  51  %R info about a relent
  52  %S print script file and linenumber
  53  %T symbol name
  54  %V hex bfd_vma
  55  %W hex bfd_vma with 0x with no leading zeros taking up 8 spaces
  56  %X no object output, fail return
  57  %d integer, like printf
  58  %s arbitrary string, like printf
  59  %u integer, like printf
  60  %v hex bfd_vma, no leading zeros
  61 */
  62
  63 static void
  64 vfinfo (FILE *fp, const char *fmt, va_list arg, bfd_boolean is_warning)
  65 {
  66   bfd_boolean fatal = FALSE;
  67
  68   while (*fmt != '\0')
  69     {
  70       while (*fmt != '%' && *fmt != '\0')
  71         {
  72           putc (*fmt, fp);
  73           fmt++;
  74         }
  75
  76       if (*fmt == '%')
  77         {
  78           fmt++;
  79           switch (*fmt++)
  80             {
  81             default:
  82               fprintf (fp, "%%%c", fmt[-1]);
  83               break;
  84
  85             case '%':
  86               /* literal % */
  87               putc ('%', fp);
  88               break;
  89
  90             case 'X':
  91               /* no object output, fail return */
  92               config.make_executable = FALSE;
  93               break;
  94
  95             case 'V':
  96               /* hex bfd_vma */
  97               {
  98                 bfd_vma value = va_arg (arg, bfd_vma);
  99                 fprintf_vma (fp, value);
 100               }
 101               break;
 102
 103             case 'v':
 104               /* hex bfd_vma, no leading zeros */
 105               {
 106                 char buf[100];
 107                 char *p = buf;
 108                 bfd_vma value = va_arg (arg, bfd_vma);
 109                 sprintf_vma (p, value);
 110                 while (*p == '0')
 111                   p++;
 112                 if (!*p)
 113                   p--;
 114                 fputs (p, fp);
 115               }
 116               break;
 117
 118             case 'W':
 119               /* hex bfd_vma with 0x with no leading zeroes taking up
 120                  8 spaces.  */
 121               {
 122                 char buf[100];
 123                 bfd_vma value;
 124                 char *p;
 125                 int len;
 126
 127                 value = va_arg (arg, bfd_vma);
 128                 sprintf_vma (buf, value);
 129                 for (p = buf; *p == '0'; ++p)
 130                   ;
 131                 if (*p == '\0')
 132                   --p;
 133                 len = strlen (p);
 134                 while (len < 8)
 135                   {
 136                     putc (' ', fp);
 137                     ++len;
 138                   }
 139                 fprintf (fp, "0x%s", p);
 140               }
 141               break;
 142
 143             case 'T':
 144               /* Symbol name.  */
 145               {
 146                 const char *name = va_arg (arg, const char *);
 147
 148                 if (name == NULL || *name == 0)
 149                   fprintf (fp, _("no symbol"));
 150                 else if (! demangling)
 151                   fprintf (fp, "%s", name);
 152                 else
 153                   {
 154                     char *demangled;
 155
 156                     demangled = demangle (name);
 157                     fprintf (fp, "%s", demangled);
 158                     free (demangled);
 159                   }
 160               }
 161               break;
 162
 163             case 'A':
 164               /* section name from a section */
 165               {
 166                 asection *sec = va_arg (arg, asection *);
 167                 bfd *abfd = sec->owner;
 168                 const char *group = NULL;
 169                 struct coff_comdat_info *ci;
 170
 171                 fprintf (fp, "%s", sec->name);
 172                 if (abfd != NULL
 173                     && bfd_get_flavour (abfd) == bfd_target_elf_flavour
 174                     && elf_next_in_group (sec) != NULL
 175                     && (sec->flags & SEC_GROUP) == 0)
 176                   group = elf_group_name (sec);
 177                 else if (abfd != NULL
 178                          && bfd_get_flavour (abfd) == bfd_target_coff_flavour
 179                          && (ci = bfd_coff_get_comdat_section (sec->owner,
 180                                                                sec)) != NULL)
 181                   group = ci->name;
 182                 if (group != NULL)
 183                   fprintf (fp, "[%s]", group);
 184               }
 185               break;
 186
 187             case 'B':
 188               /* filename from a bfd */
 189               {
 190                 bfd *abfd = va_arg (arg, bfd *);
 191
 192                 if (abfd == NULL)
 193                   fprintf (fp, "%s generated", program_name);
 194                 else if (abfd->my_archive)
 195                   fprintf (fp, "%s(%s)", abfd->my_archive->filename,
 196                            abfd->filename);
 197                 else
 198                   fprintf (fp, "%s", abfd->filename);
 199               }
 200               break;
 201
 202             case 'F':
 203               /* Error is fatal.  */
 204               fatal = TRUE;
 205               break;
 206
 207             case 'P':
 208               /* Print program name.  */
 209               fprintf (fp, "%s", program_name);
 210               break;
 211
 212             case 'E':
 213               /* current bfd error or errno */
 214               fprintf (fp, "%s", bfd_errmsg (bfd_get_error ()));
 215               break;
 216
 217             case 'I':
 218               /* filename from a lang_input_statement_type */
 219               {
 220                 lang_input_statement_type *i;
 221
 222                 i = va_arg (arg, lang_input_statement_type *);
 223                 if (bfd_my_archive (i->the_bfd) != NULL)
 224                   fprintf (fp, "(%s)",
 225                            bfd_get_filename (bfd_my_archive (i->the_bfd)));
 226                 fprintf (fp, "%s", i->local_sym_name);
 227                 if (bfd_my_archive (i->the_bfd) == NULL
 228                     && strcmp (i->local_sym_name, i->filename) != 0)
 229                   fprintf (fp, " (%s)", i->filename);
 230               }
 231               break;
 232
 233             case 'S':
 234               /* Print script file and linenumber.  */
 235               if (parsing_defsym)
 236                 fprintf (fp, "--defsym %s", lex_string);
 237               else if (ldfile_input_filename != NULL)
 238                 fprintf (fp, "%s:%u", ldfile_input_filename, lineno);
 239               else
 240                 fprintf (fp, _("built in linker script:%u"), lineno);
 241               break;
 242
 243             case 'R':
 244               /* Print all that's interesting about a relent.  */
 245               {
 246                 arelent *relent = va_arg (arg, arelent *);
 247
 248                 lfinfo (fp, "%s+0x%v (type %s)",
 249                         (*(relent->sym_ptr_ptr))->name,
 250                         relent->addend,
 251                         relent->howto->name);
 252               }
 253               break;
 254
 255             case 'C':
 256             case 'D':
 257             case 'G':
 258               /* Clever filename:linenumber with function name if possible.
 259                  The arguments are a BFD, a section, and an offset.  */
 260               {
 261                 static bfd *last_bfd;
 262                 static char *last_file = NULL;
 263                 static char *last_function = NULL;
 264                 bfd *abfd;
 265                 asection *section;
 266                 bfd_vma offset;
 267                 lang_input_statement_type *entry;
 268                 asymbol **asymbols;
 269                 const char *filename;
 270                 const char *functionname;
 271                 unsigned int linenumber;
 272                 bfd_boolean discard_last;
 273
 274                 abfd = va_arg (arg, bfd *);
 275                 section = va_arg (arg, asection *);
 276                 offset = va_arg (arg, bfd_vma);
 277
 278                 if (abfd == NULL)
 279                   {
 280                     entry = NULL;
 281                     asymbols = NULL;
 282                   }
 283                 else
 284                   {
 285                     entry = (lang_input_statement_type *) abfd->usrdata;
 286                     if (entry != (lang_input_statement_type *) NULL
 287                         && entry->asymbols != (asymbol **) NULL)
 288                       asymbols = entry->asymbols;
 289                     else
 290                       {
 291                         long symsize;
 292                         long sym_count;
 293
 294                         symsize = bfd_get_symtab_upper_bound (abfd);
 295                         if (symsize < 0)
 296                           einfo (_("%B%F: could not read symbols\n"), abfd);
 297                         asymbols = xmalloc (symsize);
 298                         sym_count = bfd_canonicalize_symtab (abfd, asymbols);
 299                         if (sym_count < 0)
 300                           einfo (_("%B%F: could not read symbols\n"), abfd);
 301                         if (entry != (lang_input_statement_type *) NULL)
 302                           {
 303                             entry->asymbols = asymbols;
 304                             entry->symbol_count = sym_count;
 305                           }
 306                       }
 307                   }
 308
 309                 /* The GNU Coding Standard requires that error messages
 310                    be of the form:
 311
 312                      source-file-name:lineno: message
 313
 314                    We do not always have a line number available so if
 315                    we cannot find them we print out the section name and
 316                    offset instread.  */
 317                 discard_last = TRUE;
 318                 if (abfd != NULL
 319                     && bfd_find_nearest_line (abfd, section, asymbols, offset,
 320                                               &filename, &functionname,
 321                                               &linenumber))
 322                   {
 323                     if (functionname != NULL && fmt[-1] == 'C')
 324                       {
 325                         /* Detect the case where we are printing out a
 326                            message for the same function as the last
 327                            call to vinfo ("%C").  In this situation do
 328                            not print out the ABFD filename or the
 329                            function name again.  Note - we do still
 330                            print out the source filename, as this will
 331                            allow programs that parse the linker's output
 332                            (eg emacs) to correctly locate multiple
 333                            errors in the same source file.  */
 334                         if (last_bfd == NULL
 335                             || last_file == NULL
 336                             || last_function == NULL
 337                             || last_bfd != abfd
 338                             || (filename != NULL
 339                                 && strcmp (last_file, filename) != 0)
 340                             || strcmp (last_function, functionname) != 0)
 341                           {
 342                             lfinfo (fp, _("%B: In function `%T':\n"),
 343                                     abfd, functionname);
 344
 345                             last_bfd = abfd;
 346                             if (last_file != NULL)
 347                               free (last_file);
 348                             last_file = NULL;
 349                             if (filename)
 350                               last_file = xstrdup (filename);
 351                             if (last_function != NULL)
 352                               free (last_function);
 353                             last_function = xstrdup (functionname);
 354                           }
 355                         discard_last = FALSE;
 356                       }
 357                     else
 358                       lfinfo (fp, "%B:", abfd);
 359
 360                     if (filename != NULL)
 361                       fprintf (fp, "%s:", filename);
 362
 363                     if (functionname != NULL && fmt[-1] == 'G')
 364                       lfinfo (fp, "%T", functionname);
 365                     else if (filename != NULL)
 366                       {
 367                         if (linenumber != 0)
 368                           fprintf (fp, "%u", linenumber);
 369                         else
 370                           lfinfo (fp, "(%A+0x%v)", section, offset);
 371                       }
 372                   }
 373                 else
 374                   lfinfo (fp, "%B:(%A+0x%v)", abfd, section, offset);
 375
 376                 if (asymbols != NULL && entry == NULL)
 377                   free (asymbols);
 378
 379                 if (discard_last)
 380                   {
 381                     last_bfd = NULL;
 382                     if (last_file != NULL)
 383                       {
 384                         free (last_file);
 385                         last_file = NULL;
 386                       }
 387                     if (last_function != NULL)
 388                       {
 389                         free (last_function);
 390                         last_function = NULL;
 391                       }
 392                   }
 393               }
 394               break;
 395
 396             case 's':
 397               /* arbitrary string, like printf */
 398               fprintf (fp, "%s", va_arg (arg, char *));
 399               break;
 400
 401             case 'd':
 402               /* integer, like printf */
 403               fprintf (fp, "%d", va_arg (arg, int));
 404               break;
 405
 406             case 'u':
 407               /* unsigned integer, like printf */
 408               fprintf (fp, "%u", va_arg (arg, unsigned int));
 409               break;
 410             }
 411         }
 412     }
 413
 414   if (is_warning && config.fatal_warnings)
 415     config.make_executable = FALSE;
 416
 417   if (fatal)
 418     xexit (1);
 419 }
 420
 421 /* Wrapper around cplus_demangle.  Strips leading underscores and
 422    other such chars that would otherwise confuse the demangler.  */
 423
 424 char *
 425 demangle (const char *name)
 426 {
 427   char *res;
 428   const char *p;
 429
 430   if (output_bfd != NULL
 431       && bfd_get_symbol_leading_char (output_bfd) == name[0])
 432     ++name;
 433
 434   /* This is a hack for better error reporting on XCOFF, PowerPC64-ELF
 435      or the MS PE format.  These formats have a number of leading '.'s
 436      on at least some symbols, so we remove all dots to avoid
 437      confusing the demangler.  */
 438   p = name;
 439   while (*p == '.')
 440     ++p;
 441
 442   res = cplus_demangle (p, DMGL_ANSI | DMGL_PARAMS);
 443   if (res)
 444     {
 445       size_t dots = p - name;
 446
 447       /* Now put back any stripped dots.  */
 448       if (dots != 0)
 449         {
 450           size_t len = strlen (res) + 1;
 451           char *add_dots = xmalloc (len + dots);
 452
 453           memcpy (add_dots, name, dots);
 454           memcpy (add_dots + dots, res, len);
 455           free (res);
 456           res = add_dots;
 457         }
 458       return res;
 459     }
 460   return xstrdup (name);
 461 }
 462
 463 /* Format info message and print on stdout.  */
 464
 465 /* (You would think this should be called just "info", but then you
 466    would be hosed by LynxOS, which defines that name in its libc.)  */
 467
 468 void
 469 info_msg (const char *fmt, ...)
 470 {
 471   va_list arg;
 472
 473   va_start (arg, fmt);
 474   vfinfo (stdout, fmt, arg, FALSE);
 475   va_end (arg);
 476 }
 477
 478 /* ('e' for error.) Format info message and print on stderr.  */
 479
 480 void
 481 einfo (const char *fmt, ...)
 482 {
 483   va_list arg;
 484
 485   va_start (arg, fmt);
 486   vfinfo (stderr, fmt, arg, TRUE);
 487   va_end (arg);
 488 }
 489
 490 void
 491 info_assert (const char *file, unsigned int line)
 492 {
 493   einfo (_("%F%P: internal error %s %d\n"), file, line);
 494 }
 495
 496 /* ('m' for map) Format info message and print on map.  */
 497
 498 void
 499 minfo (const char *fmt, ...)
 500 {
 501   va_list arg;
 502
 503   va_start (arg, fmt);
 504   vfinfo (config.map_file, fmt, arg, FALSE);
 505   va_end (arg);
 506 }
 507
 508 void
 509 lfinfo (FILE *file, const char *fmt, ...)
 510 {
 511   va_list arg;
 512
 513   va_start (arg, fmt);
 514   vfinfo (file, fmt, arg, FALSE);
 515   va_end (arg);
 516 }
 517 \f
 518 /* Functions to print the link map.  */
 519
 520 void
 521 print_space (void)
 522 {
 523   fprintf (config.map_file, " ");
 524 }
 525
 526 void
 527 print_nl (void)
 528 {
 529   fprintf (config.map_file, "\n");
 530 }
 531
 532 /* A more or less friendly abort message.  In ld.h abort is defined to
 533    call this function.  */
 534
 535 void
 536 ld_abort (const char *file, int line, const char *fn)
 537 {
 538   if (fn != NULL)
 539     einfo (_("%P: internal error: aborting at %s line %d in %s\n"),
 540            file, line, fn);
 541   else
 542     einfo (_("%P: internal error: aborting at %s line %d\n"),
 543            file, line);
 544   einfo (_("%P%F: please report this bug\n"));
 545   xexit (1);
 546 }