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[deliverable/binutils-gdb.git] / bfd / format.c

diff --git a/bfd/format.c b/bfd/format.c
index c9f1f9cd4be3f6f2c521956114a386b7470eefdb..66b9051efe55814c0e34d880d23a6e2bc83b7b61 100644 (file)
--- a/bfd/format.c
+++ b/bfd/format.c
@@ -1,29 +1,32 @@
 /* Generic BFD support for file formats.
 /* Generic BFD support for file formats.

-   Copyright (C) 1990, 91, 92, 93, 94, 95, 1999 Free Software Foundation, Inc.
+   Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1999, 2000, 2001, 2002,
+   2003, 2005, 2007, 2008, 2009 Free Software Foundation, Inc.

    Written by Cygnus Support.
 
    Written by Cygnus Support.
 

-This file is part of BFD, the Binary File Descriptor library.
+   This file is part of BFD, the Binary File Descriptor library.

 
 

-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 2 of the License, or
-(at your option) any later version.
+   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.
+   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.  */

 
 

-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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

 
 /*
 SECTION
        File formats
 
        A format is a BFD concept of high level file contents type. The
 
 /*
 SECTION
        File formats
 
        A format is a BFD concept of high level file contents type. The

-       formats supported by BFD are: 
+       formats supported by BFD are:

 
        o <<bfd_object>>
 
 
        o <<bfd_object>>
 


@@ -37,11 +40,12 @@ SECTION
 
        The BFD contains the result of an executable core dump.
 
 
        The BFD contains the result of an executable core dump.
 

-
+SUBSECTION
+       File format functions

 */
 
 */
 

-#include "bfd.h"

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

+#include "bfd.h"

 #include "libbfd.h"
 
 /* IMPORT from targets.c.  */
 #include "libbfd.h"
 
 /* IMPORT from targets.c.  */


@@ -52,7 +56,7 @@ FUNCTION
        bfd_check_format
 
 SYNOPSIS
        bfd_check_format
 
 SYNOPSIS

-       boolean bfd_check_format(bfd *abfd, bfd_format format);
+       bfd_boolean bfd_check_format (bfd *abfd, bfd_format format);

 
 DESCRIPTION
        Verify if the file attached to the BFD @var{abfd} is compatible
 
 DESCRIPTION
        Verify if the file attached to the BFD @var{abfd} is compatible


@@ -67,8 +71,8 @@ DESCRIPTION
        matches, it is used.  If not, exactly one target must recognize
        the file, or an error results.
 
        matches, it is used.  If not, exactly one target must recognize
        the file, or an error results.
 

-       The function returns <<true>> on success, otherwise <<false>>
-       with one of the following error codes:  
+       The function returns <<TRUE>> on success, otherwise <<FALSE>>
+       with one of the following error codes:

 
        o <<bfd_error_invalid_operation>> -
        if <<format>> is not one of <<bfd_object>>, <<bfd_archive>> or
 
        o <<bfd_error_invalid_operation>> -
        if <<format>> is not one of <<bfd_object>>, <<bfd_archive>> or


@@ -85,10 +89,8 @@ DESCRIPTION
        more than one backend recognised the file format.
 */
 
        more than one backend recognised the file format.
 */
 

-boolean
-bfd_check_format (abfd, format)
-     bfd *abfd;
-     bfd_format format;
+bfd_boolean
+bfd_check_format (bfd *abfd, bfd_format format)

 {
   return bfd_check_format_matches (abfd, format, NULL);
 }
 {
   return bfd_check_format_matches (abfd, format, NULL);
 }


@@ -98,10 +100,11 @@ FUNCTION
        bfd_check_format_matches
 
 SYNOPSIS
        bfd_check_format_matches
 
 SYNOPSIS

-       boolean bfd_check_format_matches(bfd *abfd, bfd_format format, char ***matching);
+       bfd_boolean bfd_check_format_matches
+         (bfd *abfd, bfd_format format, char ***matching);

 
 DESCRIPTION
 
 DESCRIPTION

-       Like <<bfd_check_format>>, except when it returns false with
+       Like <<bfd_check_format>>, except when it returns FALSE with

        <<bfd_errno>> set to <<bfd_error_file_ambiguously_recognized>>.  In that
        case, if @var{matching} is not NULL, it will be filled in with
        a NULL-terminated list of the names of the formats that matched,
        <<bfd_errno>> set to <<bfd_error_file_ambiguously_recognized>>.  In that
        case, if @var{matching} is not NULL, it will be filled in with
        a NULL-terminated list of the names of the formats that matched,


@@ -109,160 +112,248 @@ DESCRIPTION
        Then the user may choose a format and try again.
 
        When done with the list that @var{matching} points to, the caller
        Then the user may choose a format and try again.
 
        When done with the list that @var{matching} points to, the caller

-       should free it.  
+       should free it.

 */
 
 */
 

-boolean
-bfd_check_format_matches (abfd, format, matching)
-     bfd *abfd;
-     bfd_format format;
-     char ***matching;
+bfd_boolean
+bfd_check_format_matches (bfd *abfd, bfd_format format, char ***matching)

 {
   extern const bfd_target binary_vec;
 {
   extern const bfd_target binary_vec;

-  const bfd_target * const *target, *save_targ, *right_targ;
-  char **matching_vector = NULL;
-  int match_count;
+  const bfd_target * const *target;
+  const bfd_target **matching_vector = NULL;
+  const bfd_target *save_targ, *right_targ, *ar_right_targ, *match_targ;
+  int match_count, best_count, best_match;
+  int ar_match_index;

 
 

-  if (!bfd_read_p (abfd) ||
-      ((int)(abfd->format) < (int)bfd_unknown) ||
-      ((int)(abfd->format) >= (int)bfd_type_end)) {
-    bfd_set_error (bfd_error_invalid_operation);
-    return false;
-  }
+  if (matching != NULL)
+    *matching = NULL;

 
 

-  if (abfd->format != bfd_unknown)
-    return (abfd->format == format)? true: false;
+  if (!bfd_read_p (abfd)
+      || (unsigned int) abfd->format >= (unsigned int) bfd_type_end)
+    {
+      bfd_set_error (bfd_error_invalid_operation);
+      return FALSE;
+    }

 
 

+  if (abfd->format != bfd_unknown)
+    return abfd->format == format;

 
 

-  /* Since the target type was defaulted, check them 
+  /* Since the target type was defaulted, check them

      all in the hope that one will be uniquely recognized.  */
      all in the hope that one will be uniquely recognized.  */

-

   save_targ = abfd->xvec;
   match_count = 0;
   save_targ = abfd->xvec;
   match_count = 0;

-  if (matching)
+  ar_match_index = _bfd_target_vector_entries;
+
+  if (matching != NULL || *bfd_associated_vector != NULL)

     {
     {

-      matching_vector =
-       (char **) bfd_malloc (sizeof (char *) *
-                             (_bfd_target_vector_entries + 1));
+      bfd_size_type amt;
+
+      amt = sizeof (*matching_vector) * 2 * _bfd_target_vector_entries;
+      matching_vector = (const bfd_target **) bfd_malloc (amt);

       if (!matching_vector)
       if (!matching_vector)

-       return false;
-      matching_vector[0] = NULL;
-      *matching = matching_vector;
+       return FALSE;

     }
     }

-  right_targ = 0;

 
 

+  right_targ = 0;
+  ar_right_targ = 0;
+  match_targ = 0;
+  best_match = 256;
+  best_count = 0;

 
 

-  /* presume the answer is yes */
+  /* Presume the answer is yes.  */

   abfd->format = format;
 
   /* If the target type was explicitly specified, just check that target.  */
   abfd->format = format;
 
   /* If the target type was explicitly specified, just check that target.  */

+  if (!abfd->target_defaulted)
+    {
+      if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0)        /* rewind! */
+       goto err_ret;
+
+      right_targ = BFD_SEND_FMT (abfd, _bfd_check_format, (abfd));
+
+      if (right_targ)
+       goto ok_ret;
+
+      /* For a long time the code has dropped through to check all
+        targets if the specified target was wrong.  I don't know why,
+        and I'm reluctant to change it.  However, in the case of an
+        archive, it can cause problems.  If the specified target does
+        not permit archives (e.g., the binary target), then we should
+        not allow some other target to recognize it as an archive, but
+        should instead allow the specified target to recognize it as an
+        object.  When I first made this change, it broke the PE target,
+        because the specified pei-i386 target did not recognize the
+        actual pe-i386 archive.  Since there may be other problems of
+        this sort, I changed this test to check only for the binary
+        target.  */
+      if (format == bfd_archive && save_targ == &binary_vec)
+       goto err_unrecog;
+    }

 
 

-  if (!abfd->target_defaulted) {
-    if (bfd_seek (abfd, (file_ptr)0, SEEK_SET) != 0)   /* rewind! */
-      return false;
-    right_targ = BFD_SEND_FMT (abfd, _bfd_check_format, (abfd));
-    if (right_targ) {
-      abfd->xvec = right_targ;         /* Set the target as returned */
-      if (matching)
-       free (matching_vector);
-      return true;                     /* File position has moved, BTW */
+  for (target = bfd_target_vector; *target != NULL; target++)
+    {
+      const bfd_target *temp;
+      bfd_error_type err;
+
+      /* Don't check the default target twice.  */
+      if (*target == &binary_vec
+         || (!abfd->target_defaulted && *target == save_targ)
+         || (*target)->match_priority > best_match)
+       continue;
+
+      abfd->xvec = *target;    /* Change BFD's target temporarily.  */
+
+      if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0)
+       goto err_ret;
+
+      /* If _bfd_check_format neglects to set bfd_error, assume
+        bfd_error_wrong_format.  We didn't used to even pay any
+        attention to bfd_error, so I suspect that some
+        _bfd_check_format might have this problem.  */
+      bfd_set_error (bfd_error_wrong_format);
+
+      temp = BFD_SEND_FMT (abfd, _bfd_check_format, (abfd));
+      if (temp)
+       match_targ = temp;
+
+      if (temp && (abfd->format != bfd_archive || bfd_has_map (abfd)))
+       {
+         /* This format checks out as ok!  */
+         right_targ = temp;
+
+         /* If this is the default target, accept it, even if other
+            targets might match.  People who want those other targets
+            have to set the GNUTARGET variable.  */
+         if (temp == bfd_default_vector[0])
+           goto ok_ret;
+
+         if (matching_vector)
+           matching_vector[match_count] = temp;
+         match_count++;
+
+         if (temp->match_priority < best_match)
+           {
+             best_match = temp->match_priority;
+             best_count = 0;
+           }
+         best_count++;
+       }
+      else if (temp
+              || (err = bfd_get_error ()) == bfd_error_wrong_object_format
+              || err == bfd_error_file_ambiguously_recognized)
+       {
+         /* An archive with no armap or objects of the wrong type,
+            or an ambiguous match.  We want this target to match
+            if we get no better matches.  */
+         if (ar_right_targ != bfd_default_vector[0])
+           ar_right_targ = *target;
+         if (matching_vector)
+           matching_vector[ar_match_index] = *target;
+         ar_match_index++;
+       }
+      else if (err != bfd_error_wrong_format)
+       goto err_ret;

     }
 
     }
 

-    /* For a long time the code has dropped through to check all
-       targets if the specified target was wrong.  I don't know why,
-       and I'm reluctant to change it.  However, in the case of an
-       archive, it can cause problems.  If the specified target does
-       not permit archives (e.g., the binary target), then we should
-       not allow some other target to recognize it as an archive, but
-       should instead allow the specified target to recognize it as an
-       object.  When I first made this change, it broke the PE target,
-       because the specified pei-i386 target did not recognize the
-       actual pe-i386 archive.  Since there may be other problems of
-       this sort, I changed this test to check only for the binary
-       target.  */
-
-    if (format == bfd_archive && save_targ == &binary_vec)
-      {
-       abfd->xvec = save_targ;
-       abfd->format = bfd_unknown;
-       if (matching)
-         free (matching_vector);
-       bfd_set_error (bfd_error_file_not_recognized);
-       return false;
-      }
-  }
-
-  for (target = bfd_target_vector; *target != NULL; target++) {
-    const bfd_target *temp;
-
-    if (*target == &binary_vec)
-      continue;
-
-    abfd->xvec = *target;      /* Change BFD's target temporarily */
-    if (bfd_seek (abfd, (file_ptr)0, SEEK_SET) != 0)
-      return false;
-    /* If _bfd_check_format neglects to set bfd_error, assume bfd_error_wrong_format.
-       We didn't used to even pay any attention to bfd_error, so I suspect
-       that some _bfd_check_format might have this problem.  */
-    bfd_set_error (bfd_error_wrong_format);
-    temp = BFD_SEND_FMT (abfd, _bfd_check_format, (abfd));
-    if (temp) {                                /* This format checks out as ok! */
-      right_targ = temp;
-      if (matching)
+  if (best_count == 1)
+    match_count = 1;
+
+  if (match_count == 0)
+    {
+      /* Try partial matches.  */
+      right_targ = ar_right_targ;
+
+      if (right_targ == bfd_default_vector[0])
+       {
+         match_count = 1;
+       }
+      else

        {
        {

-         matching_vector[match_count] = temp->name;
-         matching_vector[match_count + 1] = NULL;
+         match_count = ar_match_index - _bfd_target_vector_entries;
+
+         if (matching_vector && match_count > 1)
+           memcpy (matching_vector,
+                   matching_vector + _bfd_target_vector_entries,
+                   sizeof (*matching_vector) * match_count);

        }
        }

-      match_count++;
-      /* If this is the default target, accept it, even if other targets
-        might match.  People who want those other targets have to set 
-        the GNUTARGET variable.  */
-      if (temp == bfd_default_vector[0])
+    }
+
+  if (match_count > 1)
+    {
+      const bfd_target * const *assoc = bfd_associated_vector;
+
+      while ((right_targ = *assoc++) != NULL)

        {
        {

-         if (matching)
+         int i = match_count;
+
+         while (--i >= 0)
+           if (matching_vector[i] == right_targ)
+             break;
+
+         if (i >= 0)

            {
            {

-             matching_vector[0] = temp->name;
-             matching_vector[1] = NULL;
+             match_count = 1;
+             break;

            }
            }

-         match_count = 1;
-         break;

        }
        }

-#ifdef GNU960
-      /* Big- and little-endian b.out archives look the same, but it doesn't
-       * matter: there is no difference in their headers, and member file byte
-       * orders will (I hope) be handled appropriately by bfd.  Ditto for big
-       * and little coff archives.  And the 4 coff/b.out object formats are
-       * unambiguous.  So accept the first match we find.
-       */
-      break;
-#endif
-    } else if (bfd_get_error () != bfd_error_wrong_format) {
-      abfd->xvec = save_targ;
-      abfd->format = bfd_unknown;
-      if (matching && bfd_get_error () != bfd_error_file_ambiguously_recognized)
-       free (matching_vector);
-      return false;

     }
     }

-  }

 
 

-  if (match_count == 1) {
-    abfd->xvec = right_targ;           /* Change BFD's target permanently */
-    if (matching)
-      free (matching_vector);
-    return true;                       /* File position has moved, BTW */
-  }
+  if (match_count == 1)
+    {
+      abfd->xvec = right_targ;
+      /* If we come out of the loop knowing that the last target that
+        matched is the one we want, then ABFD should still be in a usable
+        state (except possibly for XVEC).  */
+      if (match_targ != right_targ)
+       {
+         if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0)
+           goto err_ret;
+         match_targ = BFD_SEND_FMT (abfd, _bfd_check_format, (abfd));
+       }
+
+    ok_ret:
+      /* If the file was opened for update, then `output_has_begun'
+        some time ago when the file was created.  Do not recompute
+        sections sizes or alignments in _bfd_set_section_contents.
+        We can not set this flag until after checking the format,
+        because it will interfere with creation of BFD sections.  */
+      if (abfd->direction == both_direction)
+       abfd->output_has_begun = TRUE;
+
+      if (matching_vector)
+       free (matching_vector);
+      return TRUE;                     /* File position has moved, BTW.  */
+    }

 
 

-  abfd->xvec = save_targ;              /* Restore original target type */
-  abfd->format = bfd_unknown;          /* Restore original format */

   if (match_count == 0)
     {
   if (match_count == 0)
     {

+    err_unrecog:

       bfd_set_error (bfd_error_file_not_recognized);
       bfd_set_error (bfd_error_file_not_recognized);

-      if (matching)
+    err_ret:
+      abfd->xvec = save_targ;
+      abfd->format = bfd_unknown;
+      if (matching_vector)

        free (matching_vector);
        free (matching_vector);

+      return FALSE;
+    }
+
+  abfd->xvec = save_targ;              /* Restore original target type.  */
+  abfd->format = bfd_unknown;          /* Restore original format.  */
+  bfd_set_error (bfd_error_file_ambiguously_recognized);
+
+  if (matching)
+    {
+      *matching = (char **) matching_vector;
+      matching_vector[match_count] = NULL;
+      /* Return target names.  This is a little nasty.  Maybe we
+        should do another bfd_malloc?  */
+      while (--match_count >= 0)
+       {
+         const char *name = matching_vector[match_count]->name;
+         *(const char **) &matching_vector[match_count] = name;
+       }

     }
     }

-  else
-    bfd_set_error (bfd_error_file_ambiguously_recognized);
-  return false;
+  return FALSE;

 }
 
 /*
 }
 
 /*


@@ -270,50 +361,46 @@ FUNCTION
        bfd_set_format
 
 SYNOPSIS
        bfd_set_format
 
 SYNOPSIS

-       boolean bfd_set_format(bfd *abfd, bfd_format format);
+       bfd_boolean bfd_set_format (bfd *abfd, bfd_format format);

 
 DESCRIPTION
        This function sets the file format of the BFD @var{abfd} to the
        format @var{format}. If the target set in the BFD does not
        support the format requested, the format is invalid, or the BFD
        is not open for writing, then an error occurs.
 
 DESCRIPTION
        This function sets the file format of the BFD @var{abfd} to the
        format @var{format}. If the target set in the BFD does not
        support the format requested, the format is invalid, or the BFD
        is not open for writing, then an error occurs.

-

 */
 
 */
 

-boolean
-bfd_set_format (abfd, format)
-     bfd *abfd;
-     bfd_format format;
+bfd_boolean
+bfd_set_format (bfd *abfd, bfd_format format)

 {
 {

-
-  if (bfd_read_p (abfd) ||
-      ((int)abfd->format < (int)bfd_unknown) ||
-      ((int)abfd->format >= (int)bfd_type_end)) {
-    bfd_set_error (bfd_error_invalid_operation);
-    return false;
-  }
+  if (bfd_read_p (abfd)
+      || (unsigned int) abfd->format >= (unsigned int) bfd_type_end)
+    {
+      bfd_set_error (bfd_error_invalid_operation);
+      return FALSE;
+    }

 
   if (abfd->format != bfd_unknown)
 
   if (abfd->format != bfd_unknown)

-    return (abfd->format == format) ? true:false;
+    return abfd->format == format;

 
 

-  /* presume the answer is yes */
+  /* Presume the answer is yes.  */

   abfd->format = format;
 
   abfd->format = format;
 

-  if (!BFD_SEND_FMT (abfd, _bfd_set_format, (abfd))) {
-    abfd->format = bfd_unknown;
-    return false;
-  }
+  if (!BFD_SEND_FMT (abfd, _bfd_set_format, (abfd)))
+    {
+      abfd->format = bfd_unknown;
+      return FALSE;
+    }

 
 

-  return true;
+  return TRUE;

 }
 
 }
 

-

 /*
 FUNCTION
        bfd_format_string
 
 SYNOPSIS
 /*
 FUNCTION
        bfd_format_string
 
 SYNOPSIS

-       CONST char *bfd_format_string(bfd_format format);
+       const char *bfd_format_string (bfd_format format);

 
 DESCRIPTION
        Return a pointer to a const string
 
 DESCRIPTION
        Return a pointer to a const string


@@ -321,22 +408,22 @@ DESCRIPTION
        depending upon the value of @var{format}.
 */
 
        depending upon the value of @var{format}.
 */
 

-CONST char *
-bfd_format_string (format)
-     bfd_format format;
+const char *
+bfd_format_string (bfd_format format)

 {
 {

-  if (((int)format <(int) bfd_unknown) 
-      || ((int)format >=(int) bfd_type_end)) 
+  if (((int) format < (int) bfd_unknown)
+      || ((int) format >= (int) bfd_type_end))

     return "invalid";
     return "invalid";

-  
-  switch (format) {
-  case bfd_object:
-    return "object";           /* linker/assember/compiler output */
-  case bfd_archive: 
-    return "archive";          /* object archive file */
-  case bfd_core: 
-    return "core";             /* core dump */
-  default: 
-    return "unknown";
-  }
+
+  switch (format)
+    {
+    case bfd_object:
+      return "object";         /* Linker/assembler/compiler output.  */
+    case bfd_archive:
+      return "archive";                /* Object archive file.  */
+    case bfd_core:
+      return "core";           /* Core dump.  */
+    default:
+      return "unknown";
+    }

 }
 }