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/* Linker file opening and searching.

   Copyright 1991, 1992, 1993, 1994, 1995, 1998, 1999, 2000, 2001, 2002,

   2003, 2004, 2005, 2007, 2008 Free Software Foundation, Inc.

   This file is part of the GNU Binutils.

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 3 of the License, or

   (at your option) any later version.

   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program; if not, write to the Free Software

   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,

   MA 02110-1301, USA.  */

#include "sysdep.h"

#include "bfd.h"

#include "bfdlink.h"

#include "safe-ctype.h"

#include "ld.h"

#include "ldmisc.h"

#include "ldexp.h"

#include "ldlang.h"

#include "ldfile.h"

#include "ldmain.h"

#include <ldgram.h>

#include "ldlex.h"

#include "ldemul.h"

#include "libiberty.h"

#include "filenames.h"

const char * ldfile_input_filename;

bfd_boolean  ldfile_assumed_script = FALSE;

const char * ldfile_output_machine_name = "";

unsigned long ldfile_output_machine;

enum bfd_architecture ldfile_output_architecture;

search_dirs_type * search_head;

#ifdef VMS

static char * slash = "";

#else

#if defined (_WIN32) && ! defined (__CYGWIN32__)

static char * slash = "\\";

#else

static char * slash = "/";

#endif

#endif

typedef struct search_arch

{

  char *name;

  struct search_arch *next;

} search_arch_type;

static search_dirs_type **search_tail_ptr = &search_head;

static search_arch_type *search_arch_head;

static search_arch_type **search_arch_tail_ptr = &search_arch_head;

/* Test whether a pathname, after canonicalization, is the same or a

   sub-directory of the sysroot directory.  */

static bfd_boolean

is_sysrooted_pathname (const char *name, bfd_boolean notsame)

{

  char * realname = ld_canon_sysroot ? lrealpath (name) : NULL;

  int len;

  bfd_boolean result;

  if (! realname)

    return FALSE;

  len = strlen (realname);

  if (((! notsame && len == ld_canon_sysroot_len)

       || (len >= ld_canon_sysroot_len

           && IS_DIR_SEPARATOR (realname[ld_canon_sysroot_len])

           && (realname[ld_canon_sysroot_len] = '\0') == '\0'))

      && FILENAME_CMP (ld_canon_sysroot, realname) == 0)

    result = TRUE;

  else

    result = FALSE;

  if (realname)

    free (realname);

  return result;

}

/* Adds NAME to the library search path.

   Makes a copy of NAME using xmalloc().  */

void

ldfile_add_library_path (const char *name, bfd_boolean cmdline)

{

  search_dirs_type *new;

  if (!cmdline && config.only_cmd_line_lib_dirs)

    return;

  new = xmalloc (sizeof (search_dirs_type));

  new->next = NULL;

  new->cmdline = cmdline;

  *search_tail_ptr = new;

  search_tail_ptr = &new->next;

  /* If a directory is marked as honoring sysroot, prepend the sysroot path

     now.  */

  if (name[0] == '=')

    {

      new->name = concat (ld_sysroot, name + 1, (const char *) NULL);

      new->sysrooted = TRUE;

    }

  else

    {

      new->name = xstrdup (name);

      new->sysrooted = is_sysrooted_pathname (name, FALSE);

    }

}

/* Try to open a BFD for a lang_input_statement.  */

bfd_boolean

ldfile_try_open_bfd (const char *attempt,

                     lang_input_statement_type *entry)

{

  entry->the_bfd = bfd_openr (attempt, entry->target);

  if (trace_file_tries)

    {

      if (entry->the_bfd == NULL)

        info_msg (_("attempt to open %s failed\n"), attempt);

      else

        info_msg (_("attempt to open %s succeeded\n"), attempt);

    }

  if (entry->the_bfd == NULL)

    {

      if (bfd_get_error () == bfd_error_invalid_target)

        einfo (_("%F%P: invalid BFD target `%s'\n"), entry->target);

      return FALSE;

    }

  /* If we are searching for this file, see if the architecture is

     compatible with the output file.  If it isn't, keep searching.

     If we can't open the file as an object file, stop the search

     here.  If we are statically linking, ensure that we don't link

     a dynamic object.  */

  if (entry->search_dirs_flag || !entry->dynamic)

    {

      bfd *check;

      if (bfd_check_format (entry->the_bfd, bfd_archive))

        check = bfd_openr_next_archived_file (entry->the_bfd, NULL);

      else

        check = entry->the_bfd;

      if (check != NULL)

        {

          if (! bfd_check_format (check, bfd_object))

            {

              if (check == entry->the_bfd

                  && entry->search_dirs_flag

                  && bfd_get_error () == bfd_error_file_not_recognized

                  && ! ldemul_unrecognized_file (entry))

                {

                  int token, skip = 0;

                  char *arg, *arg1, *arg2, *arg3;

                  extern FILE *yyin;

                  /* Try to interpret the file as a linker script.  */

                  ldfile_open_command_file (attempt);

                  ldfile_assumed_script = TRUE;

                  parser_input = input_selected;

                  ldlex_both ();

                  token = INPUT_SCRIPT;

                  while (token != 0)

                    {

                      switch (token)

                        {

                        case OUTPUT_FORMAT:

                          if ((token = yylex ()) != '(')

                            continue;

                          if ((token = yylex ()) != NAME)

                            continue;

                          arg1 = yylval.name;

                          arg2 = NULL;

                          arg3 = NULL;

                          token = yylex ();

                          if (token == ',')

                            {

                              if ((token = yylex ()) != NAME)

                                {

                                  free (arg1);

                                  continue;

                                }

                              arg2 = yylval.name;

                              if ((token = yylex ()) != ','

                                  || (token = yylex ()) != NAME)

                                {

                                  free (arg1);

                                  free (arg2);

                                  continue;

                                }

                              arg3 = yylval.name;

                              token = yylex ();

                            }

                          if (token == ')')

                            {

                              switch (command_line.endian)

                                {

                                default:

                                case ENDIAN_UNSET:

                                  arg = arg1; break;

                                case ENDIAN_BIG:

                                  arg = arg2 ? arg2 : arg1; break;

                                case ENDIAN_LITTLE:

                                  arg = arg3 ? arg3 : arg1; break;

                                }

                              if (strcmp (arg, lang_get_output_target ()) != 0)

                                skip = 1;

                            }

                          free (arg1);

                          if (arg2) free (arg2);

                          if (arg3) free (arg3);

                          break;

                        case NAME:

                        case LNAME:

                        case VERS_IDENTIFIER:

                        case VERS_TAG:

                          free (yylval.name);

                          break;

                        case INT:

                          if (yylval.bigint.str)

                            free (yylval.bigint.str);

                          break;

                        }

                      token = yylex ();

                    }

                  ldlex_popstate ();

                  ldfile_assumed_script = FALSE;

                  fclose (yyin);

                  yyin = NULL;

                  if (skip)

                    {

                      if (command_line.warn_search_mismatch)

                        einfo (_("%P: skipping incompatible %s "

                                 "when searching for %s\n"),

                               attempt, entry->local_sym_name);

                      bfd_close (entry->the_bfd);

                      entry->the_bfd = NULL;

                      return FALSE;

                    }

                }

              return TRUE;

            }

          if (!entry->dynamic && (entry->the_bfd->flags & DYNAMIC) != 0)

            {

              einfo (_("%F%P: attempted static link of dynamic object `%s'\n"),

                     attempt);

              bfd_close (entry->the_bfd);

              entry->the_bfd = NULL;

              return FALSE;

            }

          if (entry->search_dirs_flag

              && !bfd_arch_get_compatible (check, link_info.output_bfd,

                                           command_line.accept_unknown_input_arch)

              /* XCOFF archives can have 32 and 64 bit objects.  */

              && ! (bfd_get_flavour (check) == bfd_target_xcoff_flavour

                    && bfd_get_flavour (link_info.output_bfd) == bfd_target_xcoff_flavour

                    && bfd_check_format (entry->the_bfd, bfd_archive)))

            {

              if (command_line.warn_search_mismatch)

                einfo (_("%P: skipping incompatible %s "

                         "when searching for %s\n"),

                       attempt, entry->local_sym_name);

              bfd_close (entry->the_bfd);

              entry->the_bfd = NULL;

              return FALSE;

            }

        }

    }

  return TRUE;

}

/* Search for and open the file specified by ENTRY.  If it is an

   archive, use ARCH, LIB and SUFFIX to modify the file name.  */

bfd_boolean

ldfile_open_file_search (const char *arch,

                         lang_input_statement_type *entry,

                         const char *lib,

                         const char *suffix)

{

  search_dirs_type *search;

  /* If this is not an archive, try to open it in the current

     directory first.  */

  if (! entry->is_archive)

    {

      if (entry->sysrooted && IS_ABSOLUTE_PATH (entry->filename))

        {

          char *name = concat (ld_sysroot, entry->filename,

                               (const char *) NULL);

          if (ldfile_try_open_bfd (name, entry))

            {

              entry->filename = name;

              return TRUE;

            }

          free (name);

        }

      else if (ldfile_try_open_bfd (entry->filename, entry))

        {

          entry->sysrooted = IS_ABSOLUTE_PATH (entry->filename)

            && is_sysrooted_pathname (entry->filename, TRUE);

          return TRUE;

        }

      if (IS_ABSOLUTE_PATH (entry->filename))

        return FALSE;

    }

  for (search = search_head; search != NULL; search = search->next)

    {

      char *string;

      if (entry->dynamic && ! link_info.relocatable)

        {

          if (ldemul_open_dynamic_archive (arch, search, entry))

            {

              entry->sysrooted = search->sysrooted;

              return TRUE;

            }

        }

      if (entry->is_archive)

        string = concat (search->name, slash, lib, entry->filename,

                         arch, suffix, (const char *) NULL);

      else

        string = concat (search->name, slash, entry->filename,

                         (const char *) 0);

      if (ldfile_try_open_bfd (string, entry))

        {

          entry->filename = string;

          entry->sysrooted = search->sysrooted;

          return TRUE;

        }

      free (string);

    }

  return FALSE;

}

/* Open the input file specified by ENTRY.  */

void

ldfile_open_file (lang_input_statement_type *entry)

{

  if (entry->the_bfd != NULL)

    return;

  if (! entry->search_dirs_flag)

    {

      if (ldfile_try_open_bfd (entry->filename, entry))

        return;

      if (strcmp (entry->filename, entry->local_sym_name) != 0)

        einfo (_("%F%P: %s (%s): No such file: %E\n"),

               entry->filename, entry->local_sym_name);

      else

        einfo (_("%F%P: %s: No such file: %E\n"), entry->local_sym_name);

    }

  else

    {

      search_arch_type *arch;

      bfd_boolean found = FALSE;

      /* Try to open <filename><suffix> or lib<filename><suffix>.a */

      for (arch = search_arch_head; arch != NULL; arch = arch->next)

        {

          found = ldfile_open_file_search (arch->name, entry, "lib", ".a");

          if (found)

            break;

#ifdef VMS

          found = ldfile_open_file_search (arch->name, entry, ":lib", ".a");

          if (found)

            break;

#endif

          found = ldemul_find_potential_libraries (arch->name, entry);

          if (found)

            break;

        }

      /* If we have found the file, we don't need to search directories

         again.  */

      if (found)

        entry->search_dirs_flag = FALSE;

      else if (entry->sysrooted

               && ld_sysroot

               && IS_ABSOLUTE_PATH (entry->local_sym_name))

        einfo (_("%F%P: cannot find %s inside %s\n"),

               entry->local_sym_name, ld_sysroot);

      else

        einfo (_("%F%P: cannot find %s\n"), entry->local_sym_name);

    }

}

/* Try to open NAME; if that fails, try NAME with EXTEN appended to it.  */

static FILE *

try_open (const char *name, const char *exten)

{

  FILE *result;

  result = fopen (name, "r");

  if (trace_file_tries)

    {

      if (result == NULL)

        info_msg (_("cannot find script file %s\n"), name);

      else

        info_msg (_("opened script file %s\n"), name);

    }

  if (result != NULL)

    return result;

  if (*exten)

    {

      char *buff;

      buff = concat (name, exten, (const char *) NULL);

      result = fopen (buff, "r");

      if (trace_file_tries)

        {

          if (result == NULL)

            info_msg (_("cannot find script file %s\n"), buff);

          else

            info_msg (_("opened script file %s\n"), buff);

        }

      free (buff);

    }

  return result;

}

/* Return TRUE iff directory DIR contains an "ldscripts" subdirectory.  */

static bfd_boolean

check_for_scripts_dir (char *dir)

{

  char *buf;

  struct stat s;

  bfd_boolean res;

  buf = concat (dir, "/ldscripts", (const char *) NULL);

  res = stat (buf, &s) == 0 && S_ISDIR (s.st_mode);

  free (buf);

  return res;

}

/* Return the default directory for finding script files.

   We look for the "ldscripts" directory in:

   SCRIPTDIR (passed from Makefile)

             (adjusted according to the current location of the binary)

   SCRIPTDIR (passed from Makefile)

   the dir where this program is (for using it from the build tree)

   the dir where this program is/../lib

             (for installing the tool suite elsewhere).  */

static char *

find_scripts_dir (void)

{

  char *end, *dir;

  size_t dirlen;

  dir = make_relative_prefix (program_name, BINDIR, SCRIPTDIR);

  if (dir)

    {

      if (check_for_scripts_dir (dir))

        return dir;

      free (dir);

    }

  dir = make_relative_prefix (program_name, TOOLBINDIR, SCRIPTDIR);

  if (dir)

    {

      if (check_for_scripts_dir (dir))

        return dir;

      free (dir);

    }

  if (check_for_scripts_dir (SCRIPTDIR))

    /* We've been installed normally.  */

    return SCRIPTDIR;

  /* Look for "ldscripts" in the dir where our binary is.  */

  end = strrchr (program_name, '/');

#ifdef HAVE_DOS_BASED_FILE_SYSTEM

  {

    /* We could have \foo\bar, or /foo\bar.  */

    char *bslash = strrchr (program_name, '\\');

    if (end == NULL || (bslash != NULL && bslash > end))

      end = bslash;

  }

#endif

  if (end == NULL)

    /* Don't look for ldscripts in the current directory.  There is

       too much potential for confusion.  */

    return NULL;

  dirlen = end - program_name;

  /* Make a copy of program_name in dir.

     Leave room for later "/../lib".  */

  dir = xmalloc (dirlen + sizeof ("/../lib"));

  strncpy (dir, program_name, dirlen);

  dir[dirlen] = '\0';

  if (check_for_scripts_dir (dir))

    return dir;

  /* Look for "ldscripts" in <the dir where our binary is>/../lib.  */

  strcpy (dir + dirlen, "/../lib");

  if (check_for_scripts_dir (dir))

    return dir;

  free (dir);

  return NULL;

}

/* Try to open NAME; if that fails, look for it in the default script

   directory, then in any directories specified with -L, without and

   with EXTEND appended.  */

static FILE *

ldfile_find_command_file (const char *name, const char *extend)

{

  search_dirs_type *search;

  FILE *result;

  char *buffer;

  static search_dirs_type *script_search;

  /* First try raw name.  */

  result = try_open (name, "");

  if (result != NULL)

    return result;

  if (!script_search)

    {

      char *script_dir = find_scripts_dir ();

      if (script_dir)

        {

          search_dirs_type **save_tail_ptr = search_tail_ptr;

          search_tail_ptr = &script_search;

          ldfile_add_library_path (script_dir, TRUE);

          search_tail_ptr = save_tail_ptr;

        }

      if (!script_search)

        script_search = search_head;

      else

        script_search->next = search_head;

    }

  /* Try now prefixes.  */

  for (search = script_search; search != NULL; search = search->next)

    {

      buffer = concat (search->name, slash, name, (const char *) NULL);

      result = try_open (buffer, extend);

      free (buffer);

      if (result)

        break;

    }

  return result;

}

void

ldfile_open_command_file (const char *name)

{

  FILE *ldlex_input_stack;

  ldlex_input_stack = ldfile_find_command_file (name, "");

  if (ldlex_input_stack == NULL)

    {

      bfd_set_error (bfd_error_system_call);

      einfo (_("%P%F: cannot open linker script file %s: %E\n"), name);

    }

  lex_push_file (ldlex_input_stack, name);

  ldfile_input_filename = name;

  lineno = 1;

  saved_script_handle = ldlex_input_stack;

}

void

ldfile_add_arch (const char *in_name)

{

  char *name = xstrdup (in_name);

  search_arch_type *new = xmalloc (sizeof (search_arch_type));

  ldfile_output_machine_name = in_name;

  new->name = name;

  new->next = NULL;

  while (*name)

    {

      *name = TOLOWER (*name);

      name++;

    }

  *search_arch_tail_ptr = new;

  search_arch_tail_ptr = &new->next;

}

/* Set the output architecture.  */

void

ldfile_set_output_arch (const char *string, enum bfd_architecture defarch)

{

  const bfd_arch_info_type *arch = bfd_scan_arch (string);

  if (arch)

    {

      ldfile_output_architecture = arch->arch;

      ldfile_output_machine = arch->mach;

      ldfile_output_machine_name = arch->printable_name;

    }

  else if (defarch != bfd_arch_unknown)

    ldfile_output_architecture = defarch;

  else

    einfo (_("%P%F: cannot represent machine `%s'\n"), string);

}