ld/ldfile.c

   1 /* Linker file opening and searching.
   2    Copyright 1991, 1992, 1993, 1994, 1995, 1998, 1999, 2000, 2001, 2002,
   3    2003, 2004, 2005, 2007, 2008 Free Software Foundation, Inc.
   4
   5    This file is part of the 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 of the License, or
  10    (at your option) 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, Inc., 51 Franklin Street - Fifth Floor, Boston,
  20    MA 02110-1301, USA.  */
  21
  22 #include "sysdep.h"
  23 #include "bfd.h"
  24 #include "bfdlink.h"
  25 #include "safe-ctype.h"
  26 #include "ld.h"
  27 #include "ldmisc.h"
  28 #include "ldexp.h"
  29 #include "ldlang.h"
  30 #include "ldfile.h"
  31 #include "ldmain.h"
  32 #include <ldgram.h>
  33 #include "ldlex.h"
  34 #include "ldemul.h"
  35 #include "libiberty.h"
  36 #include "filenames.h"
  37
  38 const char * ldfile_input_filename;
  39 bfd_boolean  ldfile_assumed_script = FALSE;
  40 const char * ldfile_output_machine_name = "";
  41 unsigned long ldfile_output_machine;
  42 enum bfd_architecture ldfile_output_architecture;
  43 search_dirs_type * search_head;
  44
  45 #ifdef VMS
  46 static char * slash = "";
  47 #else
  48 #if defined (_WIN32) && ! defined (__CYGWIN32__)
  49 static char * slash = "\\";
  50 #else
  51 static char * slash = "/";
  52 #endif
  53 #endif
  54
  55 typedef struct search_arch
  56 {
  57   char *name;
  58   struct search_arch *next;
  59 } search_arch_type;
  60
  61 static search_dirs_type **search_tail_ptr = &search_head;
  62 static search_arch_type *search_arch_head;
  63 static search_arch_type **search_arch_tail_ptr = &search_arch_head;
  64
  65 /* Test whether a pathname, after canonicalization, is the same or a
  66    sub-directory of the sysroot directory.  */
  67
  68 static bfd_boolean
  69 is_sysrooted_pathname (const char *name, bfd_boolean notsame)
  70 {
  71   char * realname = ld_canon_sysroot ? lrealpath (name) : NULL;
  72   int len;
  73   bfd_boolean result;
  74
  75   if (! realname)
  76     return FALSE;
  77
  78   len = strlen (realname);
  79
  80   if (((! notsame && len == ld_canon_sysroot_len)
  81        || (len >= ld_canon_sysroot_len
  82            && IS_DIR_SEPARATOR (realname[ld_canon_sysroot_len])
  83            && (realname[ld_canon_sysroot_len] = '\0') == '\0'))
  84       && FILENAME_CMP (ld_canon_sysroot, realname) == 0)
  85     result = TRUE;
  86   else
  87     result = FALSE;
  88
  89   if (realname)
  90     free (realname);
  91
  92   return result;
  93 }
  94
  95 /* Adds NAME to the library search path.
  96    Makes a copy of NAME using xmalloc().  */
  97
  98 void
  99 ldfile_add_library_path (const char *name, bfd_boolean cmdline)
 100 {
 101   search_dirs_type *new;
 102
 103   if (!cmdline && config.only_cmd_line_lib_dirs)
 104     return;
 105
 106   new = xmalloc (sizeof (search_dirs_type));
 107   new->next = NULL;
 108   new->cmdline = cmdline;
 109   *search_tail_ptr = new;
 110   search_tail_ptr = &new->next;
 111
 112   /* If a directory is marked as honoring sysroot, prepend the sysroot path
 113      now.  */
 114   if (name[0] == '=')
 115     {
 116       new->name = concat (ld_sysroot, name + 1, (const char *) NULL);
 117       new->sysrooted = TRUE;
 118     }
 119   else
 120     {
 121       new->name = xstrdup (name);
 122       new->sysrooted = is_sysrooted_pathname (name, FALSE);
 123     }
 124 }
 125
 126 /* Try to open a BFD for a lang_input_statement.  */
 127
 128 bfd_boolean
 129 ldfile_try_open_bfd (const char *attempt,
 130                      lang_input_statement_type *entry)
 131 {
 132   entry->the_bfd = bfd_openr (attempt, entry->target);
 133
 134   if (trace_file_tries)
 135     {
 136       if (entry->the_bfd == NULL)
 137         info_msg (_("attempt to open %s failed\n"), attempt);
 138       else
 139         info_msg (_("attempt to open %s succeeded\n"), attempt);
 140     }
 141
 142   if (entry->the_bfd == NULL)
 143     {
 144       if (bfd_get_error () == bfd_error_invalid_target)
 145         einfo (_("%F%P: invalid BFD target `%s'\n"), entry->target);
 146       return FALSE;
 147     }
 148
 149   /* If we are searching for this file, see if the architecture is
 150      compatible with the output file.  If it isn't, keep searching.
 151      If we can't open the file as an object file, stop the search
 152      here.  If we are statically linking, ensure that we don't link
 153      a dynamic object.  */
 154
 155   if (entry->search_dirs_flag || !entry->dynamic)
 156     {
 157       bfd *check;
 158
 159       if (bfd_check_format (entry->the_bfd, bfd_archive))
 160         check = bfd_openr_next_archived_file (entry->the_bfd, NULL);
 161       else
 162         check = entry->the_bfd;
 163
 164       if (check != NULL)
 165         {
 166           if (! bfd_check_format (check, bfd_object))
 167             {
 168               if (check == entry->the_bfd
 169                   && entry->search_dirs_flag
 170                   && bfd_get_error () == bfd_error_file_not_recognized
 171                   && ! ldemul_unrecognized_file (entry))
 172                 {
 173                   int token, skip = 0;
 174                   char *arg, *arg1, *arg2, *arg3;
 175                   extern FILE *yyin;
 176
 177                   /* Try to interpret the file as a linker script.  */
 178                   ldfile_open_command_file (attempt);
 179
 180                   ldfile_assumed_script = TRUE;
 181                   parser_input = input_selected;
 182                   ldlex_both ();
 183                   token = INPUT_SCRIPT;
 184                   while (token != 0)
 185                     {
 186                       switch (token)
 187                         {
 188                         case OUTPUT_FORMAT:
 189                           if ((token = yylex ()) != '(')
 190                             continue;
 191                           if ((token = yylex ()) != NAME)
 192                             continue;
 193                           arg1 = yylval.name;
 194                           arg2 = NULL;
 195                           arg3 = NULL;
 196                           token = yylex ();
 197                           if (token == ',')
 198                             {
 199                               if ((token = yylex ()) != NAME)
 200                                 {
 201                                   free (arg1);
 202                                   continue;
 203                                 }
 204                               arg2 = yylval.name;
 205                               if ((token = yylex ()) != ','
 206                                   || (token = yylex ()) != NAME)
 207                                 {
 208                                   free (arg1);
 209                                   free (arg2);
 210                                   continue;
 211                                 }
 212                               arg3 = yylval.name;
 213                               token = yylex ();
 214                             }
 215                           if (token == ')')
 216                             {
 217                               switch (command_line.endian)
 218                                 {
 219                                 default:
 220                                 case ENDIAN_UNSET:
 221                                   arg = arg1; break;
 222                                 case ENDIAN_BIG:
 223                                   arg = arg2 ? arg2 : arg1; break;
 224                                 case ENDIAN_LITTLE:
 225                                   arg = arg3 ? arg3 : arg1; break;
 226                                 }
 227                               if (strcmp (arg, lang_get_output_target ()) != 0)
 228                                 skip = 1;
 229                             }
 230                           free (arg1);
 231                           if (arg2) free (arg2);
 232                           if (arg3) free (arg3);
 233                           break;
 234                         case NAME:
 235                         case LNAME:
 236                         case VERS_IDENTIFIER:
 237                         case VERS_TAG:
 238                           free (yylval.name);
 239                           break;
 240                         case INT:
 241                           if (yylval.bigint.str)
 242                             free (yylval.bigint.str);
 243                           break;
 244                         }
 245                       token = yylex ();
 246                     }
 247                   ldlex_popstate ();
 248                   ldfile_assumed_script = FALSE;
 249                   fclose (yyin);
 250                   yyin = NULL;
 251                   if (skip)
 252                     {
 253                       if (command_line.warn_search_mismatch)
 254                         einfo (_("%P: skipping incompatible %s "
 255                                  "when searching for %s\n"),
 256                                attempt, entry->local_sym_name);
 257                       bfd_close (entry->the_bfd);
 258                       entry->the_bfd = NULL;
 259                       return FALSE;
 260                     }
 261                 }
 262               return TRUE;
 263             }
 264
 265           if (!entry->dynamic && (entry->the_bfd->flags & DYNAMIC) != 0)
 266             {
 267               einfo (_("%F%P: attempted static link of dynamic object `%s'\n"),
 268                      attempt);
 269               bfd_close (entry->the_bfd);
 270               entry->the_bfd = NULL;
 271               return FALSE;
 272             }
 273
 274           if (entry->search_dirs_flag
 275               && !bfd_arch_get_compatible (check, link_info.output_bfd,
 276                                            command_line.accept_unknown_input_arch)
 277               /* XCOFF archives can have 32 and 64 bit objects.  */
 278               && ! (bfd_get_flavour (check) == bfd_target_xcoff_flavour
 279                     && bfd_get_flavour (link_info.output_bfd) == bfd_target_xcoff_flavour
 280                     && bfd_check_format (entry->the_bfd, bfd_archive)))
 281             {
 282               if (command_line.warn_search_mismatch)
 283                 einfo (_("%P: skipping incompatible %s "
 284                          "when searching for %s\n"),
 285                        attempt, entry->local_sym_name);
 286               bfd_close (entry->the_bfd);
 287               entry->the_bfd = NULL;
 288               return FALSE;
 289             }
 290         }
 291     }
 292
 293   return TRUE;
 294 }
 295
 296 /* Search for and open the file specified by ENTRY.  If it is an
 297    archive, use ARCH, LIB and SUFFIX to modify the file name.  */
 298
 299 bfd_boolean
 300 ldfile_open_file_search (const char *arch,
 301                          lang_input_statement_type *entry,
 302                          const char *lib,
 303                          const char *suffix)
 304 {
 305   search_dirs_type *search;
 306
 307   /* If this is not an archive, try to open it in the current
 308      directory first.  */
 309   if (! entry->is_archive)
 310     {
 311       if (entry->sysrooted && IS_ABSOLUTE_PATH (entry->filename))
 312         {
 313           char *name = concat (ld_sysroot, entry->filename,
 314                                (const char *) NULL);
 315           if (ldfile_try_open_bfd (name, entry))
 316             {
 317               entry->filename = name;
 318               return TRUE;
 319             }
 320           free (name);
 321         }
 322       else if (ldfile_try_open_bfd (entry->filename, entry))
 323         {
 324           entry->sysrooted = IS_ABSOLUTE_PATH (entry->filename)
 325             && is_sysrooted_pathname (entry->filename, TRUE);
 326           return TRUE;
 327         }
 328
 329       if (IS_ABSOLUTE_PATH (entry->filename))
 330         return FALSE;
 331     }
 332
 333   for (search = search_head; search != NULL; search = search->next)
 334     {
 335       char *string;
 336
 337       if (entry->dynamic && ! link_info.relocatable)
 338         {
 339           if (ldemul_open_dynamic_archive (arch, search, entry))
 340             {
 341               entry->sysrooted = search->sysrooted;
 342               return TRUE;
 343             }
 344         }
 345
 346       string = xmalloc (strlen (search->name)
 347                         + strlen (slash)
 348                         + strlen (lib)
 349                         + strlen (entry->filename)
 350                         + strlen (arch)
 351                         + strlen (suffix)
 352                         + 1);
 353
 354       if (entry->is_archive)
 355         sprintf (string, "%s%s%s%s%s%s", search->name, slash,
 356                  lib, entry->filename, arch, suffix);
 357       else
 358         sprintf (string, "%s%s%s", search->name, slash, entry->filename);
 359
 360       if (ldfile_try_open_bfd (string, entry))
 361         {
 362           entry->filename = string;
 363           entry->sysrooted = search->sysrooted;
 364           return TRUE;
 365         }
 366
 367       free (string);
 368     }
 369
 370   return FALSE;
 371 }
 372
 373 /* Open the input file specified by ENTRY.  */
 374
 375 void
 376 ldfile_open_file (lang_input_statement_type *entry)
 377 {
 378   if (entry->the_bfd != NULL)
 379     return;
 380
 381   if (! entry->search_dirs_flag)
 382     {
 383       if (ldfile_try_open_bfd (entry->filename, entry))
 384         return;
 385       if (strcmp (entry->filename, entry->local_sym_name) != 0)
 386         einfo (_("%F%P: %s (%s): No such file: %E\n"),
 387                entry->filename, entry->local_sym_name);
 388       else
 389         einfo (_("%F%P: %s: No such file: %E\n"), entry->local_sym_name);
 390     }
 391   else
 392     {
 393       search_arch_type *arch;
 394       bfd_boolean found = FALSE;
 395
 396       /* Try to open <filename><suffix> or lib<filename><suffix>.a */
 397       for (arch = search_arch_head; arch != NULL; arch = arch->next)
 398         {
 399           found = ldfile_open_file_search (arch->name, entry, "lib", ".a");
 400           if (found)
 401             break;
 402 #ifdef VMS
 403           found = ldfile_open_file_search (arch->name, entry, ":lib", ".a");
 404           if (found)
 405             break;
 406 #endif
 407           found = ldemul_find_potential_libraries (arch->name, entry);
 408           if (found)
 409             break;
 410         }
 411
 412       /* If we have found the file, we don't need to search directories
 413          again.  */
 414       if (found)
 415         entry->search_dirs_flag = FALSE;
 416       else if (entry->sysrooted
 417                && ld_sysroot
 418                && IS_ABSOLUTE_PATH (entry->local_sym_name))
 419         einfo (_("%F%P: cannot find %s inside %s\n"),
 420                entry->local_sym_name, ld_sysroot);
 421       else
 422         einfo (_("%F%P: cannot find %s\n"), entry->local_sym_name);
 423     }
 424 }
 425
 426 /* Try to open NAME; if that fails, try NAME with EXTEN appended to it.  */
 427
 428 static FILE *
 429 try_open (const char *name, const char *exten)
 430 {
 431   FILE *result;
 432   char buff[1000];
 433
 434   result = fopen (name, "r");
 435
 436   if (trace_file_tries)
 437     {
 438       if (result == NULL)
 439         info_msg (_("cannot find script file %s\n"), name);
 440       else
 441         info_msg (_("opened script file %s\n"), name);
 442     }
 443
 444   if (result != NULL)
 445     return result;
 446
 447   if (*exten)
 448     {
 449       sprintf (buff, "%s%s", name, exten);
 450       result = fopen (buff, "r");
 451
 452       if (trace_file_tries)
 453         {
 454           if (result == NULL)
 455             info_msg (_("cannot find script file %s\n"), buff);
 456           else
 457             info_msg (_("opened script file %s\n"), buff);
 458         }
 459     }
 460
 461   return result;
 462 }
 463
 464 /* Try to open NAME; if that fails, look for it in any directories
 465    specified with -L, without and with EXTEND appended.  */
 466
 467 static FILE *
 468 ldfile_find_command_file (const char *name, const char *extend)
 469 {
 470   search_dirs_type *search;
 471   FILE *result;
 472   char buffer[1000];
 473
 474   /* First try raw name.  */
 475   result = try_open (name, "");
 476   if (result == NULL)
 477     {
 478       /* Try now prefixes.  */
 479       for (search = search_head; search != NULL; search = search->next)
 480         {
 481           sprintf (buffer, "%s%s%s", search->name, slash, name);
 482
 483           result = try_open (buffer, extend);
 484           if (result)
 485             break;
 486         }
 487     }
 488
 489   return result;
 490 }
 491
 492 void
 493 ldfile_open_command_file (const char *name)
 494 {
 495   FILE *ldlex_input_stack;
 496   ldlex_input_stack = ldfile_find_command_file (name, "");
 497
 498   if (ldlex_input_stack == NULL)
 499     {
 500       bfd_set_error (bfd_error_system_call);
 501       einfo (_("%P%F: cannot open linker script file %s: %E\n"), name);
 502     }
 503
 504   lex_push_file (ldlex_input_stack, name);
 505
 506   ldfile_input_filename = name;
 507   lineno = 1;
 508
 509   saved_script_handle = ldlex_input_stack;
 510 }
 511
 512 void
 513 ldfile_add_arch (const char *in_name)
 514 {
 515   char *name = xstrdup (in_name);
 516   search_arch_type *new = xmalloc (sizeof (search_arch_type));
 517
 518   ldfile_output_machine_name = in_name;
 519
 520   new->name = name;
 521   new->next = NULL;
 522   while (*name)
 523     {
 524       *name = TOLOWER (*name);
 525       name++;
 526     }
 527   *search_arch_tail_ptr = new;
 528   search_arch_tail_ptr = &new->next;
 529
 530 }
 531
 532 /* Set the output architecture.  */
 533
 534 void
 535 ldfile_set_output_arch (const char *string, enum bfd_architecture defarch)
 536 {
 537   const bfd_arch_info_type *arch = bfd_scan_arch (string);
 538
 539   if (arch)
 540     {
 541       ldfile_output_architecture = arch->arch;
 542       ldfile_output_machine = arch->mach;
 543       ldfile_output_machine_name = arch->printable_name;
 544     }
 545   else if (defarch != bfd_arch_unknown)
 546     ldfile_output_architecture = defarch;
 547   else
 548     einfo (_("%P%F: cannot represent machine `%s'\n"), string);
 549 }