2012-01-04 Shinichiro Hamaji <shinichiro.hamaji@gmail.com>

	* dwarf2.c (_bfd_dwarf2_slurp_debug_info): Factor out the part
	which reads DWARF2 and stores in stash from find_line.
	(find_line) Call _bfd_dwarf2_slurp_debug_info.
	* libbfd-in.h (_bfd_dwarf2_slurp_debug_info): Add declaration.
	* libbfd.h (_bfd_dwarf2_slurp_debug_info): Regenerate.
	* mach-o.c (dsym_subdir): The name of subdir where debug
	information may be stored.
	(bfd_mach_o_lookup_uuid_command): New. Lookup a load command whose
	type is UUID.
	(bfd_mach_o_dsym_for_uuid_p): New. Check if the specified BFD is
	corresponding to the executable.
	(bfd_mach_o_find_dsym): New. Find a debug information BFD in the
	specified binary file.
	(bfd_mach_o_follow_dsym): New. Find a debug information BFD for
	the original BFD.
	(bfd_mach_o_find_nearest_line): Check dSYM files for Mach-O
	executables, dylibs, and bundles.
	(bfd_mach_o_close_and_cleanup): Clean up BFDs for the dSYM file.
	* mach-o.h (dsym_bfd): The BFD of the dSYM file.

1 files changed, 155 insertions, 2 deletions

diff --git a/bfd/mach-o.c b/bfd/mach-o.c
index 26fde7d60ce..30b77d8057a 100644
--- a/bfd/mach-o.c
+++ b/bfd/mach-o.c
@@ -279,6 +279,8 @@ static const mach_o_segment_name_xlat segsec_names_xlat[] =
     { NULL, NULL }
   };
 
+static const char dsym_subdir[] = ".dSYM/Contents/Resources/DWARF";
+
 /* For both cases bfd-name => mach-o name and vice versa, the specific target
    is checked before the generic.  This allows a target (e.g. ppc for cstring)
    to override the generic definition with a more specific one.  */
@@ -4369,6 +4371,120 @@ bfd_mach_o_core_file_failing_signal (bfd *abfd ATTRIBUTE_UNUSED)
   return 0;
 }
 
+static bfd_mach_o_uuid_command *
+bfd_mach_o_lookup_uuid_command (bfd *abfd)
+{
+  bfd_mach_o_load_command *uuid_cmd;
+  int ncmd = bfd_mach_o_lookup_command (abfd, BFD_MACH_O_LC_UUID, &uuid_cmd);
+  if (ncmd != 1)
+    return FALSE;
+  return &uuid_cmd->command.uuid;
+}
+
+/* Return true if ABFD is a dSYM file and its UUID matches UUID_CMD. */
+
+static bfd_boolean
+bfd_mach_o_dsym_for_uuid_p (bfd *abfd, const bfd_mach_o_uuid_command *uuid_cmd)
+{
+  bfd_mach_o_uuid_command *dsym_uuid_cmd;
+
+  BFD_ASSERT (abfd);
+  BFD_ASSERT (uuid_cmd);
+
+  if (!bfd_check_format (abfd, bfd_object))
+    return FALSE;
+
+  if (bfd_get_flavour (abfd) != bfd_target_mach_o_flavour
+      || bfd_mach_o_get_data (abfd) == NULL
+      || bfd_mach_o_get_data (abfd)->header.filetype != BFD_MACH_O_MH_DSYM)
+    return FALSE;
+
+  dsym_uuid_cmd = bfd_mach_o_lookup_uuid_command (abfd);
+  if (dsym_uuid_cmd == NULL)
+    return FALSE;
+
+  if (memcmp (uuid_cmd->uuid, dsym_uuid_cmd->uuid,
+              sizeof (uuid_cmd->uuid)) != 0)
+    return FALSE;
+
+  return TRUE;
+}
+
+/* Find a BFD in DSYM_FILENAME which matches ARCH and UUID_CMD.
+   The caller is responsible for closing the returned BFD object and
+   its my_archive if the returned BFD is in a fat dSYM. */
+
+static bfd *
+bfd_mach_o_find_dsym (const char *dsym_filename,
+                      const bfd_mach_o_uuid_command *uuid_cmd,
+                      const bfd_arch_info_type *arch)
+{
+  bfd *base_dsym_bfd, *dsym_bfd;
+
+  BFD_ASSERT (uuid_cmd);
+
+  base_dsym_bfd = bfd_openr (dsym_filename, NULL);
+  if (base_dsym_bfd == NULL)
+    return NULL;
+
+  dsym_bfd = bfd_mach_o_fat_extract (base_dsym_bfd, bfd_object, arch);
+  if (bfd_mach_o_dsym_for_uuid_p (dsym_bfd, uuid_cmd))
+    return dsym_bfd;
+
+  bfd_close (dsym_bfd);
+  if (base_dsym_bfd != dsym_bfd)
+    bfd_close (base_dsym_bfd);
+
+  return NULL;
+}
+
+/* Return a BFD created from a dSYM file for ABFD.
+   The caller is responsible for closing the returned BFD object, its
+   filename, and its my_archive if the returned BFD is in a fat dSYM. */
+
+static bfd *
+bfd_mach_o_follow_dsym (bfd *abfd)
+{
+  char *dsym_filename;
+  bfd_mach_o_uuid_command *uuid_cmd;
+  bfd *dsym_bfd, *base_bfd = abfd;
+  const char *base_basename;
+
+  if (abfd == NULL || bfd_get_flavour (abfd) != bfd_target_mach_o_flavour)
+    return NULL;
+
+  if (abfd->my_archive)
+    base_bfd = abfd->my_archive;
+  /* BFD may have been opened from a stream. */
+  if (base_bfd->filename == NULL)
+    {
+      bfd_set_error (bfd_error_invalid_operation);
+      return NULL;
+    }
+  base_basename = lbasename (base_bfd->filename);
+
+  uuid_cmd = bfd_mach_o_lookup_uuid_command (abfd);
+  if (uuid_cmd == NULL)
+    return NULL;
+
+  /* TODO: We assume the DWARF file has the same as the binary's.
+     It seems apple's GDB checks all files in the dSYM bundle directory.
+     http://opensource.apple.com/source/gdb/gdb-1708/src/gdb/macosx/macosx-tdep.c
+  */
+  dsym_filename = (char *)bfd_malloc (strlen (base_bfd->filename)
+                                       + strlen (dsym_subdir) + 1
+                                       + strlen (base_basename) + 1);
+  sprintf (dsym_filename, "%s%s/%s",
+           base_bfd->filename, dsym_subdir, base_basename);
+
+  dsym_bfd = bfd_mach_o_find_dsym (dsym_filename, uuid_cmd,
+                                   bfd_get_arch_info (abfd));
+  if (dsym_bfd == NULL)
+    free (dsym_filename);
+
+  return dsym_bfd;
+}
+
 bfd_boolean
 bfd_mach_o_find_nearest_line (bfd *abfd,
 			      asection *section,
@@ -4379,9 +4495,34 @@ bfd_mach_o_find_nearest_line (bfd *abfd,
 			      unsigned int *line_ptr)
 {
   bfd_mach_o_data_struct *mdata = bfd_mach_o_get_data (abfd);
-  /* TODO: Handle executables and dylibs by using dSYMs. */
-  if (mdata->header.filetype != BFD_MACH_O_MH_OBJECT)
+  if (mdata == NULL)
     return FALSE;
+  switch (mdata->header.filetype)
+    {
+    case BFD_MACH_O_MH_OBJECT:
+      break;
+    case BFD_MACH_O_MH_EXECUTE:
+    case BFD_MACH_O_MH_DYLIB:
+    case BFD_MACH_O_MH_BUNDLE:
+    case BFD_MACH_O_MH_KEXT_BUNDLE:
+      if (mdata->dwarf2_find_line_info == NULL)
+        {
+          mdata->dsym_bfd = bfd_mach_o_follow_dsym (abfd);
+          /* When we couldn't find dSYM for this binary, we look for
+             the debug information in the binary itself. In this way,
+             we won't try finding separated dSYM again because
+             mdata->dwarf2_find_line_info will be filled. */
+          if (! mdata->dsym_bfd)
+            break;
+          if (! _bfd_dwarf2_slurp_debug_info (abfd, mdata->dsym_bfd,
+                                              dwarf_debug_sections, symbols,
+                                              &mdata->dwarf2_find_line_info))
+            return FALSE;
+        }
+      break;
+    default:
+      return FALSE;
+    }
   if (_bfd_dwarf2_find_nearest_line (abfd, dwarf_debug_sections,
 				     section, symbols, offset,
 				     filename_ptr, functionname_ptr,
@@ -4399,6 +4540,18 @@ bfd_mach_o_close_and_cleanup (bfd *abfd)
     {
       _bfd_dwarf2_cleanup_debug_info (abfd, &mdata->dwarf2_find_line_info);
       bfd_mach_o_free_cached_info (abfd);
+      if (mdata->dsym_bfd != NULL)
+        {
+          bfd *fat_bfd = mdata->dsym_bfd->my_archive;
+          char *dsym_filename = (char *)(fat_bfd
+                                         ? fat_bfd->filename
+                                         : mdata->dsym_bfd->filename);
+          bfd_close (mdata->dsym_bfd);
+          mdata->dsym_bfd = NULL;
+          if (fat_bfd)
+            bfd_close (fat_bfd);
+          free (dsym_filename);
+        }
     }
 
   return _bfd_generic_close_and_cleanup (abfd);