ld/ldfile.c

   1 /* Linker file opening and searching.
   2    Copyright 1991, 1992, 1993, 1994, 1995, 1998, 1999, 2000, 2001, 2002
   3    Free Software Foundation, Inc.
   4
   5 This file is part of GLD, the Gnu Linker.
   6
   7 GLD 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 2, or (at your option)
  10 any later version.
  11
  12 GLD 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 GLD; see the file COPYING.  If not, write to the Free
  19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  20 02111-1307, USA.  */
  21
  22 /* ldfile.c:  look after all the file stuff.  */
  23
  24 #include "bfd.h"
  25 #include "sysdep.h"
  26 #include "bfdlink.h"
  27 #include "safe-ctype.h"
  28 #include "ld.h"
  29 #include "ldmisc.h"
  30 #include "ldexp.h"
  31 #include "ldlang.h"
  32 #include "ldfile.h"
  33 #include "ldmain.h"
  34 #include <ldgram.h>
  35 #include "ldlex.h"
  36 #include "ldemul.h"
  37 #include "libiberty.h"
  38
  39 const char *ldfile_input_filename;
  40 bfd_boolean ldfile_assumed_script = FALSE;
  41 const char *ldfile_output_machine_name = "";
  42 unsigned long ldfile_output_machine;
  43 enum bfd_architecture ldfile_output_architecture;
  44 search_dirs_type *search_head;
  45
  46 #ifndef MPW
  47 #ifdef VMS
  48 char *slash = "";
  49 #else
  50 #if defined (_WIN32) && ! defined (__CYGWIN32__)
  51 char *slash = "\\";
  52 #else
  53 char *slash = "/";
  54 #endif
  55 #endif
  56 #else /* MPW */
  57 /* The MPW path char is a colon.  */
  58 char *slash = ":";
  59 #endif /* MPW */
  60
  61 /* LOCAL */
  62
  63 static search_dirs_type **search_tail_ptr = &search_head;
  64
  65 typedef struct search_arch {
  66   char *name;
  67   struct search_arch *next;
  68 } search_arch_type;
  69
  70 static search_arch_type *search_arch_head;
  71 static search_arch_type **search_arch_tail_ptr = &search_arch_head;
  72
  73 static FILE *try_open PARAMS ((const char *name, const char *exten));
  74
  75 void
  76 ldfile_add_library_path (name, cmdline)
  77      const char *name;
  78      bfd_boolean cmdline;
  79 {
  80   search_dirs_type *new;
  81
  82   if (!cmdline && config.only_cmd_line_lib_dirs)
  83     return;
  84
  85   new = (search_dirs_type *) xmalloc (sizeof (search_dirs_type));
  86   new->next = NULL;
  87   new->name = name;
  88   new->cmdline = cmdline;
  89   *search_tail_ptr = new;
  90   search_tail_ptr = &new->next;
  91 }
  92
  93 /* Try to open a BFD for a lang_input_statement.  */
  94
  95 bfd_boolean
  96 ldfile_try_open_bfd (attempt, entry)
  97      const char *attempt;
  98      lang_input_statement_type *entry;
  99 {
 100   entry->the_bfd = bfd_openr (attempt, entry->target);
 101
 102   if (trace_file_tries)
 103     {
 104       if (entry->the_bfd == NULL)
 105         info_msg (_("attempt to open %s failed\n"), attempt);
 106       else
 107         info_msg (_("attempt to open %s succeeded\n"), attempt);
 108     }
 109
 110   if (entry->the_bfd == NULL)
 111     {
 112       if (bfd_get_error () == bfd_error_invalid_target)
 113         einfo (_("%F%P: invalid BFD target `%s'\n"), entry->target);
 114       return FALSE;
 115     }
 116
 117   /* If we are searching for this file, see if the architecture is
 118      compatible with the output file.  If it isn't, keep searching.
 119      If we can't open the file as an object file, stop the search
 120      here.  */
 121
 122   if (entry->search_dirs_flag)
 123     {
 124       bfd *check;
 125
 126       if (bfd_check_format (entry->the_bfd, bfd_archive))
 127         check = bfd_openr_next_archived_file (entry->the_bfd, NULL);
 128       else
 129         check = entry->the_bfd;
 130
 131       if (check != NULL)
 132         {
 133           if (! bfd_check_format (check, bfd_object))
 134             {
 135               if (check == entry->the_bfd
 136                   && bfd_get_error () == bfd_error_file_not_recognized
 137                   && ! ldemul_unrecognized_file (entry))
 138                 {
 139                   int token, skip = 0;
 140                   char *arg, *arg1, *arg2, *arg3;
 141                   extern FILE *yyin;
 142
 143                   /* Try to interpret the file as a linker script.  */
 144                   ldfile_open_command_file (attempt);
 145
 146                   ldfile_assumed_script = TRUE;
 147                   parser_input = input_selected;
 148                   ldlex_both ();
 149                   token = INPUT_SCRIPT;
 150                   while (token != 0)
 151                     {
 152                       switch (token)
 153                         {
 154                         case OUTPUT_FORMAT:
 155                           if ((token = yylex ()) != '(')
 156                             continue;
 157                           if ((token = yylex ()) != NAME)
 158                             continue;
 159                           arg1 = yylval.name;
 160                           arg2 = NULL;
 161                           arg3 = NULL;
 162                           token = yylex ();
 163                           if (token == ',')
 164                             {
 165                               if ((token = yylex ()) != NAME)
 166                                 {
 167                                   free (arg1);
 168                                   continue;
 169                                 }
 170                               arg2 = yylval.name;
 171                               if ((token = yylex ()) != ','
 172                                   || (token = yylex ()) != NAME)
 173                                 {
 174                                   free (arg1);
 175                                   free (arg2);
 176                                   continue;
 177                                 }
 178                               arg3 = yylval.name;
 179                               token = yylex ();
 180                             }
 181                           if (token == ')')
 182                             {
 183                               switch (command_line.endian)
 184                                 {
 185                                 default:
 186                                 case ENDIAN_UNSET:
 187                                   arg = arg1; break;
 188                                 case ENDIAN_BIG:
 189                                   arg = arg2 ? arg2 : arg1; break;
 190                                 case ENDIAN_LITTLE:
 191                                   arg = arg3 ? arg3 : arg1; break;
 192                                 }
 193                               if (strcmp (arg, lang_get_output_target ()) != 0)
 194                                 skip = 1;
 195                             }
 196                           free (arg1);
 197                           if (arg2) free (arg2);
 198                           if (arg3) free (arg3);
 199                           break;
 200                         case NAME:
 201                         case LNAME:
 202                         case VERS_IDENTIFIER:
 203                         case VERS_TAG:
 204                           free (yylval.name);
 205                           break;
 206                         case INT:
 207                           if (yylval.bigint.str)
 208                             free (yylval.bigint.str);
 209                           break;
 210                         }
 211                       token = yylex ();
 212                     }
 213                   ldfile_assumed_script = FALSE;
 214                   fclose (yyin);
 215                   yyin = NULL;
 216                   if (skip)
 217                     {
 218                       einfo (_("%P: skipping incompatible %s when searching for %s\n"),
 219                              attempt, entry->local_sym_name);
 220                       bfd_close (entry->the_bfd);
 221                       entry->the_bfd = NULL;
 222                       return FALSE;
 223                     }
 224                 }
 225               return TRUE;
 226             }
 227
 228           if ((bfd_arch_get_compatible (check, output_bfd,
 229                                         command_line.accept_unknown_input_arch) == NULL)
 230               /* XCOFF archives can have 32 and 64 bit objects.  */
 231               && ! (bfd_get_flavour (check) == bfd_target_xcoff_flavour
 232                     && bfd_get_flavour (output_bfd) == bfd_target_xcoff_flavour
 233                     && bfd_check_format (entry->the_bfd, bfd_archive)))
 234             {
 235               einfo (_("%P: skipping incompatible %s when searching for %s\n"),
 236                      attempt, entry->local_sym_name);
 237               bfd_close (entry->the_bfd);
 238               entry->the_bfd = NULL;
 239               return FALSE;
 240             }
 241         }
 242     }
 243
 244   return TRUE;
 245 }
 246
 247 /* Search for and open the file specified by ENTRY.  If it is an
 248    archive, use ARCH, LIB and SUFFIX to modify the file name.  */
 249
 250 bfd_boolean
 251 ldfile_open_file_search (arch, entry, lib, suffix)
 252      const char *arch;
 253      lang_input_statement_type *entry;
 254      const char *lib;
 255      const char *suffix;
 256 {
 257   search_dirs_type *search;
 258
 259   /* If this is not an archive, try to open it in the current
 260      directory first.  */
 261   if (! entry->is_archive)
 262     {
 263       if (ldfile_try_open_bfd (entry->filename, entry))
 264         return TRUE;
 265     }
 266
 267   for (search = search_head;
 268        search != (search_dirs_type *) NULL;
 269        search = search->next)
 270     {
 271       char *string;
 272
 273       if (entry->dynamic && ! link_info.relocateable)
 274         {
 275           if (ldemul_open_dynamic_archive (arch, search, entry))
 276             return TRUE;
 277         }
 278
 279       string = (char *) xmalloc (strlen (search->name)
 280                                  + strlen (slash)
 281                                  + strlen (lib)
 282                                  + strlen (entry->filename)
 283                                  + strlen (arch)
 284                                  + strlen (suffix)
 285                                  + 1);
 286
 287       if (entry->is_archive)
 288         sprintf (string, "%s%s%s%s%s%s", search->name, slash,
 289                  lib, entry->filename, arch, suffix);
 290       else if (entry->filename[0] == '/' || entry->filename[0] == '.'
 291 #if defined (__MSDOS__) || defined (_WIN32)
 292                || entry->filename[0] == '\\'
 293                || (ISALPHA (entry->filename[0])
 294                    && entry->filename[1] == ':')
 295 #endif
 296           )
 297         strcpy (string, entry->filename);
 298       else
 299         sprintf (string, "%s%s%s", search->name, slash, entry->filename);
 300
 301       if (ldfile_try_open_bfd (string, entry))
 302         {
 303           entry->filename = string;
 304           return TRUE;
 305         }
 306
 307       free (string);
 308     }
 309
 310   return FALSE;
 311 }
 312
 313 /* Open the input file specified by ENTRY.  */
 314
 315 void
 316 ldfile_open_file (entry)
 317      lang_input_statement_type *entry;
 318 {
 319   if (entry->the_bfd != NULL)
 320     return;
 321
 322   if (! entry->search_dirs_flag)
 323     {
 324       if (ldfile_try_open_bfd (entry->filename, entry))
 325         return;
 326       if (strcmp (entry->filename, entry->local_sym_name) != 0)
 327         einfo (_("%F%P: cannot open %s for %s: %E\n"),
 328                entry->filename, entry->local_sym_name);
 329       else
 330         einfo (_("%F%P: cannot open %s: %E\n"), entry->local_sym_name);
 331     }
 332   else
 333     {
 334       search_arch_type *arch;
 335       bfd_boolean found = FALSE;
 336
 337       /* Try to open <filename><suffix> or lib<filename><suffix>.a */
 338       for (arch = search_arch_head;
 339            arch != (search_arch_type *) NULL;
 340            arch = arch->next)
 341         {
 342           found = ldfile_open_file_search (arch->name, entry, "lib", ".a");
 343           if (found)
 344             break;
 345 #ifdef VMS
 346           found = ldfile_open_file_search (arch->name, entry, ":lib", ".a");
 347           if (found)
 348             break;
 349 #endif
 350           found = ldemul_find_potential_libraries (arch->name, entry);
 351           if (found)
 352             break;
 353         }
 354
 355       /* If we have found the file, we don't need to search directories
 356          again.  */
 357       if (found)
 358         entry->search_dirs_flag = FALSE;
 359       else
 360         einfo (_("%F%P: cannot find %s\n"), entry->local_sym_name);
 361     }
 362 }
 363
 364 /* Try to open NAME; if that fails, try NAME with EXTEN appended to it.  */
 365
 366 static FILE *
 367 try_open (name, exten)
 368      const char *name;
 369      const char *exten;
 370 {
 371   FILE *result;
 372   char buff[1000];
 373
 374   result = fopen (name, "r");
 375
 376   if (trace_file_tries)
 377     {
 378       if (result == NULL)
 379         info_msg (_("cannot find script file %s\n"), name);
 380       else
 381         info_msg (_("opened script file %s\n"), name);
 382     }
 383
 384   if (result != NULL)
 385     return result;
 386
 387   if (*exten)
 388     {
 389       sprintf (buff, "%s%s", name, exten);
 390       result = fopen (buff, "r");
 391
 392       if (trace_file_tries)
 393         {
 394           if (result == NULL)
 395             info_msg (_("cannot find script file %s\n"), buff);
 396           else
 397             info_msg (_("opened script file %s\n"), buff);
 398         }
 399     }
 400
 401   return result;
 402 }
 403
 404 /* Try to open NAME; if that fails, look for it in any directories
 405    specified with -L, without and with EXTEND apppended.  */
 406
 407 FILE *
 408 ldfile_find_command_file (name, extend)
 409      const char *name;
 410      const char *extend;
 411 {
 412   search_dirs_type *search;
 413   FILE *result;
 414   char buffer[1000];
 415
 416   /* First try raw name.  */
 417   result = try_open (name, "");
 418   if (result == (FILE *) NULL)
 419     {
 420       /* Try now prefixes.  */
 421       for (search = search_head;
 422            search != (search_dirs_type *) NULL;
 423            search = search->next)
 424         {
 425           sprintf (buffer, "%s%s%s", search->name, slash, name);
 426
 427           result = try_open (buffer, extend);
 428           if (result)
 429             break;
 430         }
 431     }
 432
 433   return result;
 434 }
 435
 436 void
 437 ldfile_open_command_file (name)
 438      const char *name;
 439 {
 440   FILE *ldlex_input_stack;
 441   ldlex_input_stack = ldfile_find_command_file (name, "");
 442
 443   if (ldlex_input_stack == (FILE *) NULL)
 444     {
 445       bfd_set_error (bfd_error_system_call);
 446       einfo (_("%P%F: cannot open linker script file %s: %E\n"), name);
 447     }
 448
 449   lex_push_file (ldlex_input_stack, name);
 450
 451   ldfile_input_filename = name;
 452   lineno = 1;
 453
 454   saved_script_handle = ldlex_input_stack;
 455 }
 456
 457 #ifdef GNU960
 458 static char *
 459 gnu960_map_archname (name)
 460      char *name;
 461 {
 462   struct tabentry { char *cmd_switch; char *arch; };
 463   static struct tabentry arch_tab[] =
 464   {
 465         "",   "",
 466         "KA", "ka",
 467         "KB", "kb",
 468         "KC", "mc",     /* Synonym for MC */
 469         "MC", "mc",
 470         "CA", "ca",
 471         "SA", "ka",     /* Functionally equivalent to KA */
 472         "SB", "kb",     /* Functionally equivalent to KB */
 473         NULL, ""
 474   };
 475   struct tabentry *tp;
 476
 477   for (tp = arch_tab; tp->cmd_switch != NULL; tp++)
 478     {
 479       if (! strcmp (name,tp->cmd_switch))
 480         break;
 481     }
 482
 483   if (tp->cmd_switch == NULL)
 484     einfo (_("%P%F: unknown architecture: %s\n"), name);
 485
 486   return tp->arch;
 487 }
 488
 489 void
 490 ldfile_add_arch (name)
 491      char *name;
 492 {
 493   search_arch_type *new =
 494     (search_arch_type *) xmalloc ((bfd_size_type) (sizeof (search_arch_type)));
 495
 496   if (*name != '\0')
 497     {
 498       if (ldfile_output_machine_name[0] != '\0')
 499         {
 500           einfo (_("%P%F: target architecture respecified\n"));
 501           return;
 502         }
 503
 504       ldfile_output_machine_name = name;
 505     }
 506
 507   new->next = (search_arch_type *) NULL;
 508   new->name = gnu960_map_archname (name);
 509   *search_arch_tail_ptr = new;
 510   search_arch_tail_ptr = &new->next;
 511 }
 512
 513 #else /* not GNU960 */
 514
 515 void
 516 ldfile_add_arch (in_name)
 517      const char *in_name;
 518 {
 519   char *name = xstrdup (in_name);
 520   search_arch_type *new =
 521     (search_arch_type *) xmalloc (sizeof (search_arch_type));
 522
 523   ldfile_output_machine_name = in_name;
 524
 525   new->name = name;
 526   new->next = (search_arch_type *) NULL;
 527   while (*name)
 528     {
 529       *name = TOLOWER (*name);
 530       name++;
 531     }
 532   *search_arch_tail_ptr = new;
 533   search_arch_tail_ptr = &new->next;
 534
 535 }
 536 #endif
 537
 538 /* Set the output architecture.  */
 539
 540 void
 541 ldfile_set_output_arch (string)
 542      const char *string;
 543 {
 544   const bfd_arch_info_type *arch = bfd_scan_arch (string);
 545
 546   if (arch)
 547     {
 548       ldfile_output_architecture = arch->arch;
 549       ldfile_output_machine = arch->mach;
 550       ldfile_output_machine_name = arch->printable_name;
 551     }
 552   else
 553     {
 554       einfo (_("%P%F: cannot represent machine `%s'\n"), string);
 555     }
 556 }