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Improve "set debug separate-debug-file" 

"set debug separate-debug-file" shows which candidates are considered,
when trying to find separate debug info.  But it's not clear if GDB used
a certain candidate, and if not, why not.  This patch adds some
precision:

Before:

  Looking for separate debug info (debug link) for /lib/x86_64-linux-gnu/libc.so.6
    Trying /lib/x86_64-linux-gnu/libc-2.23.so
    Trying /lib/x86_64-linux-gnu/.debug/libc-2.23.so
    Trying /usr/lib/debug//lib/x86_64-linux-gnu/libc-2.23.so

After:

  Looking for separate debug info (debug link) for /lib/x86_64-linux-gnu/libc.so.6
    Trying /lib/x86_64-linux-gnu/libc-2.23.so... no, same file as the objfile.
    Trying /lib/x86_64-linux-gnu/.debug/libc-2.23.so... no, unable to open.
    Trying /usr/lib/debug//lib/x86_64-linux-gnu/libc-2.23.so... yes!

gdb/ChangeLog:

	* build-id.c (build_id_to_debug_bfd): Enhance debug output.
	* symfile.c (separate_debug_file_exists): Likewise.
This commit is contained in:
Simon Marchi 2018-12-26 11:49:51 -05:00 committed by Simon Marchi
parent 5172760036
commit 50794b45a2
3 changed files with 66 additions and 9 deletions
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5
gdb/ChangeLog
View File

@ -1,3 +1,8 @@
2018-12-26 Simon Marchi <simon.marchi@ericsson.com>
* build-id.c (build_id_to_debug_bfd): Enhance debug output.
* symfile.c (separate_debug_file_exists): Likewise.
2018-12-24 Andrew Burgess <andrew.burgess@embecosm.com>
* c-exp.y (field_name): Allow DOUBLE_KEYWORD, INT_KEYWORD, LONG,

31
gdb/build-id.c
View File

@ -98,7 +98,10 @@ build_id_to_debug_bfd (size_t build_id_len, const bfd_byte *build_id)
link += ".debug";
if (separate_debug_file_debug)
printf_unfiltered (_(" Trying %s\n"), link.c_str ());
{
printf_unfiltered (_(" Trying %s..."), link.c_str ());
gdb_flush (gdb_stdout);
}
/* lrealpath() is expensive even for the usually non-existent files. */
gdb::unique_xmalloc_ptr<char> filename;
@ -106,16 +109,36 @@ build_id_to_debug_bfd (size_t build_id_len, const bfd_byte *build_id)
filename.reset (lrealpath (link.c_str ()));
if (filename == NULL)
continue;
{
if (separate_debug_file_debug)
printf_unfiltered (_(" no, unable to compute real path\n"));
continue;
}
/* We expect to be silent on the non-existing files. */
abfd = gdb_bfd_open (filename.get (), gnutarget, -1);
if (abfd == NULL)
continue;
{
if (separate_debug_file_debug)
printf_unfiltered (_(" no, unable to open.\n"));
continue;
}
if (build_id_verify (abfd.get(), build_id_len, build_id))
break;
{
if (separate_debug_file_debug)
printf_unfiltered (_(" yes!\n"));
break;
}
else
{
if (separate_debug_file_debug)
printf_unfiltered (_(" no, build-id does not match.\n"));
}
abfd.release ();
}

39
gdb/symfile.c
View File

@ -1285,12 +1285,20 @@ separate_debug_file_exists (const std::string &name, unsigned long crc,
return 0;
if (separate_debug_file_debug)
printf_filtered (_(" Trying %s\n"), name.c_str ());
{
printf_filtered (_(" Trying %s..."), name.c_str ());
gdb_flush (gdb_stdout);
}
gdb_bfd_ref_ptr abfd (gdb_bfd_open (name.c_str (), gnutarget, -1));
if (abfd == NULL)
return 0;
{
if (separate_debug_file_debug)
printf_filtered (_(" no, unable to open.\n"));
return 0;
}
/* Verify symlinks were not the cause of filename_cmp name difference above.
@ -1309,7 +1317,12 @@ separate_debug_file_exists (const std::string &name, unsigned long crc,
{
if (abfd_stat.st_dev == parent_stat.st_dev
&& abfd_stat.st_ino == parent_stat.st_ino)
return 0;
{
if (separate_debug_file_debug)
printf_filtered (_(" no, same file as the objfile.\n"));
return 0;
}
verified_as_different = 1;
}
else
@ -1318,7 +1331,12 @@ separate_debug_file_exists (const std::string &name, unsigned long crc,
file_crc_p = gdb_bfd_crc (abfd.get (), &file_crc);
if (!file_crc_p)
return 0;
{
if (separate_debug_file_debug)
printf_filtered (_(" no, error computing CRC.\n"));
return 0;
}
if (crc != file_crc)
{
@ -1331,7 +1349,12 @@ separate_debug_file_exists (const std::string &name, unsigned long crc,
if (!verified_as_different)
{
if (!gdb_bfd_crc (parent_objfile->obfd, &parent_crc))
return 0;
{
if (separate_debug_file_debug)
printf_filtered (_(" no, error computing CRC.\n"));
return 0;
}
}
if (verified_as_different || parent_crc != file_crc)
@ -1339,9 +1362,15 @@ separate_debug_file_exists (const std::string &name, unsigned long crc,
" does not match \"%s\" (CRC mismatch).\n"),
name.c_str (), objfile_name (parent_objfile));
if (separate_debug_file_debug)
printf_filtered (_(" no, CRC doesn't match.\n"));
return 0;
}
if (separate_debug_file_debug)
printf_filtered (_(" yes!\n"));
return 1;
}