Imported from /home/lorry/working-area/delta_binutils-tarball/binutils-2.25.tar.bz2.HEADbinutils-2.25master

1 files changed, 668 insertions, 0 deletions

diff --git a/ld/ldfile.c b/ld/ldfile.c
new file mode 100644
index 0000000..782ed7f
--- /dev/null
+++ b/ld/ldfile.c
@@ -0,0 +1,668 @@
+/* Linker file opening and searching.
+   Copyright (C) 1991-2014 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"
+#ifdef ENABLE_PLUGINS
+#include "plugin-api.h"
+#include "plugin.h"
+#endif /* ENABLE_PLUGINS */
+
+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)
+{
+  char *realname;
+  int len;
+  bfd_boolean result;
+
+  if (ld_canon_sysroot == NULL)
+    return FALSE;
+
+  realname = lrealpath (name);
+  len = strlen (realname);
+  result = FALSE;
+  if (len > ld_canon_sysroot_len
+      && IS_DIR_SEPARATOR (realname[ld_canon_sysroot_len]))
+    {
+      realname[ld_canon_sysroot_len] = '\0';
+      result = FILENAME_CMP (ld_canon_sysroot, realname) == 0;
+    }
+
+  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_dirs;
+
+  if (!cmdline && config.only_cmd_line_lib_dirs)
+    return;
+
+  new_dirs = (search_dirs_type *) xmalloc (sizeof (search_dirs_type));
+  new_dirs->next = NULL;
+  new_dirs->cmdline = cmdline;
+  *search_tail_ptr = new_dirs;
+  search_tail_ptr = &new_dirs->next;
+
+  /* If a directory is marked as honoring sysroot, prepend the sysroot path
+     now.  */
+  if (name[0] == '=')
+    new_dirs->name = concat (ld_sysroot, name + 1, (const char *) NULL);
+  else
+    new_dirs->name = xstrdup (name);
+}
+
+/* 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 (verbose)
+    {
+      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;
+    }
+
+  /* Linker needs to decompress sections.  */
+  entry->the_bfd->flags |= BFD_DECOMPRESS;
+
+  /* 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.
+
+     In the code below, it's OK to exit early if the check fails,
+     closing the checked BFD and returning FALSE, but if the BFD
+     checks out compatible, do not exit early returning TRUE, or
+     the plugins will not get a chance to claim the file.  */
+
+  if (entry->flags.search_dirs || !entry->flags.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->flags.search_dirs
+		  && 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;
+		    }
+		}
+	      goto success;
+	    }
+
+	  if (!entry->flags.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->flags.search_dirs
+	      && !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;
+	    }
+	}
+    }
+success:
+#ifdef ENABLE_PLUGINS
+  /* If plugins are active, they get first chance to claim
+     any successfully-opened input file.  We skip archives
+     here; the plugin wants us to offer it the individual
+     members when we enumerate them, not the whole file.  We
+     also ignore corefiles, because that's just weird.  It is
+     a needed side-effect of calling  bfd_check_format with
+     bfd_object that it sets the bfd's arch and mach, which
+     will be needed when and if we want to bfd_create a new
+     one using this one as a template.  */
+  if (bfd_check_format (entry->the_bfd, bfd_object)
+      && plugin_active_plugins_p ()
+      && !no_more_claiming)
+    {
+      int fd = open (attempt, O_RDONLY | O_BINARY);
+      if (fd >= 0)
+	{
+	  struct ld_plugin_input_file file;
+
+	  file.name = attempt;
+	  file.offset = 0;
+	  file.filesize = lseek (fd, 0, SEEK_END);
+	  file.fd = fd;
+	  plugin_maybe_claim (&file, entry);
+	}
+    }
+#endif /* ENABLE_PLUGINS */
+
+  /* It opened OK, the format checked out, and the plugins have had
+     their chance to claim it, so this is success.  */
+  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->flags.maybe_archive)
+    {
+      if (entry->flags.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))
+	return TRUE;
+
+      if (IS_ABSOLUTE_PATH (entry->filename))
+	return FALSE;
+    }
+
+  for (search = search_head; search != NULL; search = search->next)
+    {
+      char *string;
+
+      if (entry->flags.dynamic && ! link_info.relocatable)
+	{
+	  if (ldemul_open_dynamic_archive (arch, search, entry))
+	    return TRUE;
+	}
+
+      if (entry->flags.maybe_archive && !entry->flags.full_name_provided)
+	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;
+	  return TRUE;
+	}
+
+      free (string);
+    }
+
+  return FALSE;
+}
+
+/* Open the input file specified by ENTRY.
+   PR 4437: Do not stop on the first missing file, but
+   continue processing other input files in case there
+   are more errors to report.  */
+
+void
+ldfile_open_file (lang_input_statement_type *entry)
+{
+  if (entry->the_bfd != NULL)
+    return;
+
+  if (! entry->flags.search_dirs)
+    {
+      if (ldfile_try_open_bfd (entry->filename, entry))
+	return;
+
+      if (filename_cmp (entry->filename, entry->local_sym_name) != 0)
+	einfo (_("%P: cannot find %s (%s): %E\n"),
+	       entry->filename, entry->local_sym_name);
+      else
+	einfo (_("%P: cannot find %s: %E\n"), entry->local_sym_name);
+
+      entry->flags.missing_file = TRUE;
+      input_flags.missing_file = TRUE;
+    }
+  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->flags.search_dirs = FALSE;
+      else
+	{
+	  if (entry->flags.sysrooted
+	       && ld_sysroot
+	       && IS_ABSOLUTE_PATH (entry->local_sym_name))
+	    einfo (_("%P: cannot find %s inside %s\n"),
+		   entry->local_sym_name, ld_sysroot);
+	  else
+	    einfo (_("%P: cannot find %s\n"), entry->local_sym_name);
+	  entry->flags.missing_file = TRUE;
+	  input_flags.missing_file = TRUE;
+	}
+    }
+}
+
+/* Try to open NAME.  */
+
+static FILE *
+try_open (const char *name, bfd_boolean *sysrooted)
+{
+  FILE *result;
+
+  result = fopen (name, "r");
+
+  if (result != NULL)
+    *sysrooted = is_sysrooted_pathname (name);
+
+  if (verbose)
+    {
+      if (result == NULL)
+	info_msg (_("cannot find script file %s\n"), name);
+      else
+	info_msg (_("opened script file %s\n"), name);
+    }
+
+  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)
+   the dir where this program is (for using it from the build tree).  */
+
+static char *
+find_scripts_dir (void)
+{
+  char *dir;
+
+  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);
+    }
+
+  /* Look for "ldscripts" in the dir where our binary is.  */
+  dir = make_relative_prefix (program_name, ".", ".");
+  if (dir)
+    {
+      if (check_for_scripts_dir (dir))
+	return dir;
+      free (dir);
+    }
+
+  return NULL;
+}
+
+/* If DEFAULT_ONLY is false, try to open NAME; if that fails, look for
+   it in directories specified with -L, then in the default script
+   directory.  If DEFAULT_ONLY is true, the search is restricted to
+   the default script location.  */
+
+static FILE *
+ldfile_find_command_file (const char *name,
+			  bfd_boolean default_only,
+			  bfd_boolean *sysrooted)
+{
+  search_dirs_type *search;
+  FILE *result = NULL;
+  char *path;
+  static search_dirs_type *script_search;
+
+  if (!default_only)
+    {
+      /* First try raw name.  */
+      result = try_open (name, sysrooted);
+      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;
+	}
+    }
+
+  /* Temporarily append script_search to the path list so that the
+     paths specified with -L will be searched first.  */
+  *search_tail_ptr = script_search;
+
+  /* Try now prefixes.  */
+  for (search = default_only ? script_search : search_head;
+       search != NULL;
+       search = search->next)
+    {
+      path = concat (search->name, slash, name, (const char *) NULL);
+      result = try_open (path, sysrooted);
+      free (path);
+      if (result)
+	break;
+    }
+
+  /* Restore the original path list.  */
+  *search_tail_ptr = NULL;
+
+  return result;
+}
+
+/* Open command file NAME.  */
+
+static void
+ldfile_open_command_file_1 (const char *name, bfd_boolean default_only)
+{
+  FILE *ldlex_input_stack;
+  bfd_boolean sysrooted;
+
+  ldlex_input_stack = ldfile_find_command_file (name, default_only, &sysrooted);
+
+  if (ldlex_input_stack == NULL)
+    {
+      bfd_set_error (bfd_error_system_call);
+      einfo (_("%P%F: cannot open linker script file %s: %E\n"), name);
+      return;
+    }
+
+  lex_push_file (ldlex_input_stack, name, sysrooted);
+
+  lineno = 1;
+
+  saved_script_handle = ldlex_input_stack;
+}
+
+/* Open command file NAME in the current directory, -L directories,
+   the default script location, in that order.  */
+
+void
+ldfile_open_command_file (const char *name)
+{
+  ldfile_open_command_file_1 (name, FALSE);
+}
+
+/* Open command file NAME at the default script location.  */
+
+void
+ldfile_open_default_command_file (const char *name)
+{
+  ldfile_open_command_file_1 (name, TRUE);
+}
+
+void
+ldfile_add_arch (const char *in_name)
+{
+  char *name = xstrdup (in_name);
+  search_arch_type *new_arch = (search_arch_type *)
+      xmalloc (sizeof (search_arch_type));
+
+  ldfile_output_machine_name = in_name;
+
+  new_arch->name = name;
+  new_arch->next = NULL;
+  while (*name)
+    {
+      *name = TOLOWER (*name);
+      name++;
+    }
+  *search_arch_tail_ptr = new_arch;
+  search_arch_tail_ptr = &new_arch->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);
+}