osprey/cygnus/ld/ldfile.c

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/*
 * Copyright 2003, 2004, 2005, 2006 PathScale, Inc.  All Rights Reserved.
 */

/* Linker file opening and searching.
   Copyright 1991, 1992, 1993, 1994, 1995, 1998, 1999, 2000, 2001, 2002,
   2003, 2004, 2005 Free Software Foundation, Inc.

   This file is part of GLD, the Gnu Linker.

   GLD 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 2, or (at your option)
   any later version.

   GLD 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 GLD; see the file COPYING.  If not, write to the Free
   Software Foundation, 59 Temple Place - Suite 330, Boston, MA
   02111-1307, USA.  */

/* ldfile.c:  look after all the file stuff.  */

#include "bfd.h"
#include "sysdep.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"

#ifdef KEY
extern bfd_boolean is_ipa;
extern bfd_boolean ipa_is_whirl(bfd *);
extern void (*p_Ipalink_ErrMsg_EC_infile)(char *);
#endif

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
char * slash = "";
#else
#if defined (_WIN32) && ! defined (__CYGWIN32__)
char * slash = "\\";
#else
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, 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)
        {
          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;
      }

#ifdef KEY
    if (is_ipa &&
        ipa_is_whirl(check))
      return TRUE;  // WHIRL object
#endif

    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, 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 (output_bfd) == bfd_target_xcoff_flavour
        && bfd_check_format (entry->the_bfd, bfd_archive)))
      {
        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;
}

#ifdef KEY 

static FILE *
read_gcc_output(const char *cmdline)
{
    FILE *fp = NULL;
    int cmd_len = strlen (cmdline);
    char *gcc_cmd = (char *)malloc((5+cmd_len)*sizeof(char));
    if (!gcc_cmd)  {
      printf ("Failed to malloc!\n");
      exit (1);
    }
    strcpy (gcc_cmd, "gcc ");
    strcat (gcc_cmd, cmdline);
#if 0
    char *gcc_path = get_full_phase_name(P_ld);

    if (asprintf(&gcc_cmd, "%s %s", gcc_path, cmdline) == -1) {
        internal_error("cannot allocate memory");
        goto bail;
    }
#endif
    if ((fp = popen(gcc_cmd, "r")) == NULL) {
        fp = NULL;
    }
    
    free (gcc_cmd);
    return fp;
}

bfd_boolean
ldfile_try_auto_open_bfd (const char *gcc_option, lang_input_statement_type *entry)
{
  FILE *fp = read_gcc_output (gcc_option);
  if (!fp) return FALSE;
  char buf[1000];
  while (fread(buf, 1, 1000, fp) != 0) {
    if (strstr (buf, entry->filename) != 0) {
      char *arg = buf;
      while (*arg == '/') arg++;
      arg--;
      char *iter = arg;
      while (*iter != '\n') iter++;
      *iter = '\0';
      if (arg && ldfile_try_open_bfd (arg, entry)) {
        entry->filename = arg;
        pclose (fp);
        return TRUE;
      }
    }
  }
  pclose (fp);
  return FALSE;
}

bfd_boolean
ldfile_open_file_auto_search (lang_input_statement_type *entry)
{
    int liblen = strlen (entry->filename);
    // sizeof ("-print-file-name=") = 17, 
    // plus considering the "/" and "lib" and ".so.*" or ".a"
    char *gcc_option = (char *) malloc ((30 + liblen) * sizeof(char));
    if (!gcc_option) {
      printf ("Failed to malloc!\n");
      exit (1);
    }
    strcpy (gcc_option, "-print-file-name=");
    if (!strstr (entry->filename, "lib")) 
      strcat (gcc_option, "lib");
    if (strstr (entry->filename, ".so") ||
        strstr (entry->filename, ".a")) {
      strcat (gcc_option, entry->filename);
      if (ldfile_try_auto_open_bfd (gcc_option, entry)) { 
         free (gcc_option);
         return TRUE;
      }
    }
    strcat (gcc_option, entry->filename);
    strcat (gcc_option, ".so");
    if (ldfile_try_auto_open_bfd (gcc_option, entry)) {
      free (gcc_option);
      return TRUE;
    }
    else {
      int option_len = strlen (gcc_option);
      *(gcc_option + option_len - 1) = '\0'; 
      *(gcc_option + option_len - 2) = 'a'; 
      if (ldfile_try_auto_open_bfd (gcc_option, entry)) {
        free (gcc_option);
        return TRUE;
      } 
    }
    return FALSE;
}
#endif


/* 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;
      }
  }

      string = xmalloc (strlen (search->name)
      + strlen (slash)
      + strlen (lib)
      + strlen (entry->filename)
      + strlen (arch)
      + strlen (suffix)
      + 1);

      if (entry->is_archive)
  sprintf (string, "%s%s%s%s%s%s", search->name, slash,
     lib, entry->filename, arch, suffix);
      else
  sprintf (string, "%s%s%s", search->name, slash, entry->filename);

      if (ldfile_try_open_bfd (string, entry))
  {
    entry->filename = string;
    entry->sysrooted = search->sysrooted;
    return TRUE;
  }
      free (string);
    }

#ifdef KEY 
    return ldfile_open_file_auto_search (entry);
#endif
}

/* 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
#ifdef KEY
  (*p_Ipalink_ErrMsg_EC_infile)(entry->local_sym_name);
#else
  einfo (_("%F%P: %s: No such file: %E\n"), entry->local_sym_name);
#endif
    }
  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;
  char buff[1000];

  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)
    {
      sprintf (buff, "%s%s", name, exten);
      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);
  }
    }

  return result;
}

/* Try to open NAME; if that fails, look for it in any directories
   specified with -L, without and with EXTEND appended.  */

FILE *
ldfile_find_command_file (const char *name, const char *extend)
{
  search_dirs_type *search;
  FILE *result;
  char buffer[1000];

  /* First try raw name.  */
  result = try_open (name, "");
  if (result == NULL)
    {
      /* Try now prefixes.  */
      for (search = search_head; search != NULL; search = search->next)
  {
    sprintf (buffer, "%s%s%s", search->name, slash, name);

    result = try_open (buffer, extend);
    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);
}

---