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Improve "set debug separate-debug-file"

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"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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31
gdb/build-id.c
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@@ -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 ();
}