552 lines
13 KiB
C
552 lines
13 KiB
C
/* Linker file opening and searching.
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Copyright 1991, 1992, 1993, 1994, 1995, 1998, 1999, 2000, 2001, 2002,
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2003, 2004, 2005, 2007 Free Software Foundation, Inc.
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This file is part of GLD, the Gnu Linker.
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GLD is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GLD is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GLD; see the file COPYING. If not, write to the Free
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Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
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02110-1301, USA. */
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/* ldfile.c: look after all the file stuff. */
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#include "sysdep.h"
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#include "bfd.h"
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#include "bfdlink.h"
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#include "safe-ctype.h"
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#include "ld.h"
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#include "ldmisc.h"
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#include "ldexp.h"
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#include "ldlang.h"
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#include "ldfile.h"
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#include "ldmain.h"
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#include <ldgram.h>
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#include "ldlex.h"
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#include "ldemul.h"
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#include "libiberty.h"
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#include "filenames.h"
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const char * ldfile_input_filename;
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bfd_boolean ldfile_assumed_script = FALSE;
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const char * ldfile_output_machine_name = "";
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unsigned long ldfile_output_machine;
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enum bfd_architecture ldfile_output_architecture;
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search_dirs_type * search_head;
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#ifdef VMS
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static char * slash = "";
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#else
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#if defined (_WIN32) && ! defined (__CYGWIN32__)
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static char * slash = "\\";
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#else
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static char * slash = "/";
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#endif
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#endif
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typedef struct search_arch
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{
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char *name;
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struct search_arch *next;
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} search_arch_type;
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static search_dirs_type **search_tail_ptr = &search_head;
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static search_arch_type *search_arch_head;
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static search_arch_type **search_arch_tail_ptr = &search_arch_head;
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/* Test whether a pathname, after canonicalization, is the same or a
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sub-directory of the sysroot directory. */
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static bfd_boolean
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is_sysrooted_pathname (const char *name, bfd_boolean notsame)
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{
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char * realname = ld_canon_sysroot ? lrealpath (name) : NULL;
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int len;
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bfd_boolean result;
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if (! realname)
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return FALSE;
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len = strlen (realname);
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if (((! notsame && len == ld_canon_sysroot_len)
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|| (len >= ld_canon_sysroot_len
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&& IS_DIR_SEPARATOR (realname[ld_canon_sysroot_len])
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&& (realname[ld_canon_sysroot_len] = '\0') == '\0'))
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&& FILENAME_CMP (ld_canon_sysroot, realname) == 0)
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result = TRUE;
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else
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result = FALSE;
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if (realname)
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free (realname);
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return result;
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}
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/* Adds NAME to the library search path.
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Makes a copy of NAME using xmalloc(). */
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void
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ldfile_add_library_path (const char *name, bfd_boolean cmdline)
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{
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search_dirs_type *new;
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if (!cmdline && config.only_cmd_line_lib_dirs)
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return;
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new = xmalloc (sizeof (search_dirs_type));
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new->next = NULL;
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new->cmdline = cmdline;
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*search_tail_ptr = new;
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search_tail_ptr = &new->next;
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/* If a directory is marked as honoring sysroot, prepend the sysroot path
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now. */
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if (name[0] == '=')
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{
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new->name = concat (ld_sysroot, name + 1, NULL);
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new->sysrooted = TRUE;
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}
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else
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{
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new->name = xstrdup (name);
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new->sysrooted = is_sysrooted_pathname (name, FALSE);
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}
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}
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/* Try to open a BFD for a lang_input_statement. */
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bfd_boolean
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ldfile_try_open_bfd (const char *attempt,
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lang_input_statement_type *entry)
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{
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entry->the_bfd = bfd_openr (attempt, entry->target);
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if (trace_file_tries)
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{
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if (entry->the_bfd == NULL)
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info_msg (_("attempt to open %s failed\n"), attempt);
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else
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info_msg (_("attempt to open %s succeeded\n"), attempt);
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}
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if (entry->the_bfd == NULL)
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{
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if (bfd_get_error () == bfd_error_invalid_target)
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einfo (_("%F%P: invalid BFD target `%s'\n"), entry->target);
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return FALSE;
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}
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/* If we are searching for this file, see if the architecture is
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compatible with the output file. If it isn't, keep searching.
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If we can't open the file as an object file, stop the search
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here. If we are statically linking, ensure that we don't link
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a dynamic object. */
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if (entry->search_dirs_flag || !entry->dynamic)
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{
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bfd *check;
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if (bfd_check_format (entry->the_bfd, bfd_archive))
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check = bfd_openr_next_archived_file (entry->the_bfd, NULL);
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else
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check = entry->the_bfd;
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if (check != NULL)
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{
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if (! bfd_check_format (check, bfd_object))
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{
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if (check == entry->the_bfd
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&& entry->search_dirs_flag
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&& bfd_get_error () == bfd_error_file_not_recognized
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&& ! ldemul_unrecognized_file (entry))
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{
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int token, skip = 0;
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char *arg, *arg1, *arg2, *arg3;
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extern FILE *yyin;
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/* Try to interpret the file as a linker script. */
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ldfile_open_command_file (attempt);
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ldfile_assumed_script = TRUE;
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parser_input = input_selected;
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ldlex_both ();
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token = INPUT_SCRIPT;
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while (token != 0)
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{
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switch (token)
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{
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case OUTPUT_FORMAT:
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if ((token = yylex ()) != '(')
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continue;
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if ((token = yylex ()) != NAME)
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continue;
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arg1 = yylval.name;
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arg2 = NULL;
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arg3 = NULL;
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token = yylex ();
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if (token == ',')
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{
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if ((token = yylex ()) != NAME)
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{
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free (arg1);
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continue;
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}
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arg2 = yylval.name;
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if ((token = yylex ()) != ','
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|| (token = yylex ()) != NAME)
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{
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free (arg1);
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free (arg2);
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continue;
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}
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arg3 = yylval.name;
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token = yylex ();
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}
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if (token == ')')
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{
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switch (command_line.endian)
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{
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default:
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case ENDIAN_UNSET:
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arg = arg1; break;
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case ENDIAN_BIG:
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arg = arg2 ? arg2 : arg1; break;
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case ENDIAN_LITTLE:
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arg = arg3 ? arg3 : arg1; break;
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}
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if (strcmp (arg, lang_get_output_target ()) != 0)
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skip = 1;
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}
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free (arg1);
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if (arg2) free (arg2);
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if (arg3) free (arg3);
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break;
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case NAME:
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case LNAME:
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case VERS_IDENTIFIER:
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case VERS_TAG:
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free (yylval.name);
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break;
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case INT:
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if (yylval.bigint.str)
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free (yylval.bigint.str);
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break;
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}
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token = yylex ();
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}
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ldlex_popstate ();
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ldfile_assumed_script = FALSE;
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fclose (yyin);
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yyin = NULL;
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if (skip)
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{
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if (command_line.warn_search_mismatch)
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einfo (_("%P: skipping incompatible %s "
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"when searching for %s\n"),
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attempt, entry->local_sym_name);
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bfd_close (entry->the_bfd);
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entry->the_bfd = NULL;
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return FALSE;
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}
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}
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return TRUE;
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}
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if (!entry->dynamic && (entry->the_bfd->flags & DYNAMIC) != 0)
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{
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einfo (_("%F%P: attempted static link of dynamic object `%s'\n"),
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attempt);
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bfd_close (entry->the_bfd);
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entry->the_bfd = NULL;
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return FALSE;
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}
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if (entry->search_dirs_flag
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&& !bfd_arch_get_compatible (check, output_bfd,
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command_line.accept_unknown_input_arch)
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/* XCOFF archives can have 32 and 64 bit objects. */
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&& ! (bfd_get_flavour (check) == bfd_target_xcoff_flavour
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&& bfd_get_flavour (output_bfd) == bfd_target_xcoff_flavour
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&& bfd_check_format (entry->the_bfd, bfd_archive)))
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{
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if (command_line.warn_search_mismatch)
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einfo (_("%P: skipping incompatible %s "
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"when searching for %s\n"),
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attempt, entry->local_sym_name);
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bfd_close (entry->the_bfd);
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entry->the_bfd = NULL;
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return FALSE;
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}
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}
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}
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return TRUE;
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}
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/* Search for and open the file specified by ENTRY. If it is an
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archive, use ARCH, LIB and SUFFIX to modify the file name. */
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bfd_boolean
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ldfile_open_file_search (const char *arch,
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lang_input_statement_type *entry,
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const char *lib,
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const char *suffix)
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{
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search_dirs_type *search;
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/* If this is not an archive, try to open it in the current
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directory first. */
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if (! entry->is_archive)
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{
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if (entry->sysrooted && IS_ABSOLUTE_PATH (entry->filename))
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{
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char *name = concat (ld_sysroot, entry->filename,
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(const char *) NULL);
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if (ldfile_try_open_bfd (name, entry))
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{
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entry->filename = name;
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return TRUE;
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}
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free (name);
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}
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else if (ldfile_try_open_bfd (entry->filename, entry))
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{
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entry->sysrooted = IS_ABSOLUTE_PATH (entry->filename)
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&& is_sysrooted_pathname (entry->filename, TRUE);
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return TRUE;
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}
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if (IS_ABSOLUTE_PATH (entry->filename))
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return FALSE;
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}
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for (search = search_head; search != NULL; search = search->next)
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{
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char *string;
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if (entry->dynamic && ! link_info.relocatable)
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{
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if (ldemul_open_dynamic_archive (arch, search, entry))
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{
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entry->sysrooted = search->sysrooted;
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return TRUE;
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}
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}
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string = xmalloc (strlen (search->name)
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+ strlen (slash)
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+ strlen (lib)
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+ strlen (entry->filename)
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+ strlen (arch)
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+ strlen (suffix)
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+ 1);
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if (entry->is_archive)
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sprintf (string, "%s%s%s%s%s%s", search->name, slash,
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lib, entry->filename, arch, suffix);
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else
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sprintf (string, "%s%s%s", search->name, slash, entry->filename);
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if (ldfile_try_open_bfd (string, entry))
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{
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entry->filename = string;
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entry->sysrooted = search->sysrooted;
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return TRUE;
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}
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free (string);
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}
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return FALSE;
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}
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/* Open the input file specified by ENTRY. */
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void
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ldfile_open_file (lang_input_statement_type *entry)
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{
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if (entry->the_bfd != NULL)
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return;
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if (! entry->search_dirs_flag)
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{
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if (ldfile_try_open_bfd (entry->filename, entry))
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return;
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if (strcmp (entry->filename, entry->local_sym_name) != 0)
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einfo (_("%F%P: %s (%s): No such file: %E\n"),
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entry->filename, entry->local_sym_name);
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else
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einfo (_("%F%P: %s: No such file: %E\n"), entry->local_sym_name);
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}
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else
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{
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search_arch_type *arch;
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bfd_boolean found = FALSE;
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/* Try to open <filename><suffix> or lib<filename><suffix>.a */
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for (arch = search_arch_head; arch != NULL; arch = arch->next)
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{
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found = ldfile_open_file_search (arch->name, entry, "lib", ".a");
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if (found)
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break;
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#ifdef VMS
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found = ldfile_open_file_search (arch->name, entry, ":lib", ".a");
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if (found)
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break;
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#endif
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found = ldemul_find_potential_libraries (arch->name, entry);
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if (found)
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break;
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}
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/* If we have found the file, we don't need to search directories
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again. */
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if (found)
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entry->search_dirs_flag = FALSE;
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else if (entry->sysrooted
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&& ld_sysroot
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&& IS_ABSOLUTE_PATH (entry->local_sym_name))
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einfo (_("%F%P: cannot find %s inside %s\n"),
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entry->local_sym_name, ld_sysroot);
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else
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einfo (_("%F%P: cannot find %s\n"), entry->local_sym_name);
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}
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}
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/* Try to open NAME; if that fails, try NAME with EXTEN appended to it. */
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static FILE *
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try_open (const char *name, const char *exten)
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{
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FILE *result;
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char buff[1000];
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result = fopen (name, "r");
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if (trace_file_tries)
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{
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if (result == NULL)
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info_msg (_("cannot find script file %s\n"), name);
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else
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info_msg (_("opened script file %s\n"), name);
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}
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if (result != NULL)
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return result;
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if (*exten)
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{
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sprintf (buff, "%s%s", name, exten);
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result = fopen (buff, "r");
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if (trace_file_tries)
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{
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if (result == NULL)
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info_msg (_("cannot find script file %s\n"), buff);
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else
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info_msg (_("opened script file %s\n"), buff);
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}
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}
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return result;
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}
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/* Try to open NAME; if that fails, look for it in any directories
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specified with -L, without and with EXTEND appended. */
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static FILE *
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ldfile_find_command_file (const char *name, const char *extend)
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{
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search_dirs_type *search;
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FILE *result;
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char buffer[1000];
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/* First try raw name. */
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result = try_open (name, "");
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if (result == NULL)
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{
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/* Try now prefixes. */
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for (search = search_head; search != NULL; search = search->next)
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{
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sprintf (buffer, "%s%s%s", search->name, slash, name);
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result = try_open (buffer, extend);
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if (result)
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break;
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}
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}
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return result;
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}
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void
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ldfile_open_command_file (const char *name)
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{
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FILE *ldlex_input_stack;
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ldlex_input_stack = ldfile_find_command_file (name, "");
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if (ldlex_input_stack == NULL)
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{
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bfd_set_error (bfd_error_system_call);
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einfo (_("%P%F: cannot open linker script file %s: %E\n"), name);
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}
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lex_push_file (ldlex_input_stack, name);
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ldfile_input_filename = name;
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lineno = 1;
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saved_script_handle = ldlex_input_stack;
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}
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void
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ldfile_add_arch (const char *in_name)
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{
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char *name = xstrdup (in_name);
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search_arch_type *new = xmalloc (sizeof (search_arch_type));
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ldfile_output_machine_name = in_name;
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new->name = name;
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new->next = NULL;
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while (*name)
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{
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*name = TOLOWER (*name);
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name++;
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}
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*search_arch_tail_ptr = new;
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search_arch_tail_ptr = &new->next;
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}
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/* Set the output architecture. */
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void
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ldfile_set_output_arch (const char *string, enum bfd_architecture defarch)
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{
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const bfd_arch_info_type *arch = bfd_scan_arch (string);
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if (arch)
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{
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ldfile_output_architecture = arch->arch;
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ldfile_output_machine = arch->mach;
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ldfile_output_machine_name = arch->printable_name;
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}
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else if (defarch != bfd_arch_unknown)
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ldfile_output_architecture = defarch;
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else
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einfo (_("%P%F: cannot represent machine `%s'\n"), string);
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}
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