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Introduce "set debug separate-debug-file"

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I helped someone figure out why their separate debug info (debug
link-based) was not found by gdb.  It turns out that the debug file was
not named properly.  It made me realize that it is quite difficult to
diagnose this kind of problems.  This patch adds some debug output to
show where GDB looks for those files, so that it should be (more)
obvious to find what's wrong.

Here's an example of the result, first with an example of unsuccessful lookup,
and then a successful one.

  (gdb) set debug separate-debug-file on
  (gdb) file /usr/bin/gnome-calculator
  Reading symbols from /usr/bin/gnome-calculator...
  Looking for separate debug info (build-id) for /usr/bin/gnome-calculator
    Trying /usr/local/lib/debug/.build-id/0d/5c5e8c86dbe4f4f95f7a13de04f91d377f3c6a.debug

  Looking for separate debug info (debug link) for /usr/bin/gnome-calculator
    Trying /usr/bin/5c5e8c86dbe4f4f95f7a13de04f91d377f3c6a.debug
    Trying /usr/bin/.debug/5c5e8c86dbe4f4f95f7a13de04f91d377f3c6a.debug
    Trying /usr/local/lib/debug//usr/bin/5c5e8c86dbe4f4f95f7a13de04f91d377f3c6a.debug
  (no debugging symbols found)...done.
  (gdb) set debug-file-directory /usr/lib/debug
  (gdb) file /usr/bin/gnome-calculator
  Reading symbols from /usr/bin/gnome-calculator...
  Looking for separate debug info by build-id for /usr/bin/gnome-calculator
    Trying /usr/lib/debug/.build-id/0d/5c5e8c86dbe4f4f95f7a13de04f91d377f3c6a.debug
  Reading symbols from /usr/lib/debug/.build-id/0d/5c5e8c86dbe4f4f95f7a13de04f91d377f3c6a.debug...done.
  done.

Note: here, the debug link happens to be named like the build-id, but it
doesn't have to be this way.  It puzzled me for a minute.

gdb/ChangeLog:

	* NEWS (Changes since GDB 8.0): Announce {set,show} debug
	separate-debug-file commands.
	* symfile.h (separate_debug_file_debug): New global.
	* symfile.c (separate_debug_file_debug): New global.
	(separate_debug_file_exists, find_separate_debug_file): Add
	debug output.
	(_initialize_symfile): Add "set debug separate-debug-file"
	command.
	* build-id.c (build_id_to_debug_bfd,
	find_separate_debug_file_by_buildid): Add debug output.

gdb/doc/ChangeLog:

	* gdb.texinfo (Optional Messages about Internal Happenings):
	Document {set,show} debug separate-debug-file commands.
This commit is contained in:
Simon Marchi 2017-06-11 23:16:01 +02:00
parent 9b97dfbf80
commit c4dcb155c4
7 changed files with 59 additions and 0 deletions
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13
gdb/ChangeLog
View File

@ -1,3 +1,16 @@
2017-06-11 Simon Marchi <simon.marchi@ericsson.com>
* NEWS (Changes since GDB 8.0): Announce {set,show} debug
separate-debug-file commands.
* symfile.h (separate_debug_file_debug): New global.
* symfile.c (separate_debug_file_debug): New global.
(separate_debug_file_exists, find_separate_debug_file): Add
debug output.
(_initialize_symfile): Add "set debug separate-debug-file"
command.
* build-id.c (build_id_to_debug_bfd,
find_separate_debug_file_by_buildid): Add debug output.
2017-06-10 Simon Marchi <simon.marchi@polymtl.ca>
* gdbarch.sh (displaced_step_free_closure): Remove.

6
gdb/NEWS
View File

@ -17,6 +17,12 @@
QStartupWithShell
Indicates whether the inferior must be started with a shell or not.
* New commands
set debug separate-debug-file
show debug separate-debug-file
Control the display of debug output about separate debug file search.
*** Changes in GDB 8.0
* GDB now supports access to the PKU register on GNU/Linux. The register is

7
gdb/build-id.c
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@ -112,6 +112,9 @@ build_id_to_debug_bfd (size_t build_id_len, const bfd_byte *build_id)
s += sprintf (s, "%02x", (unsigned) *data++);
strcpy (s, ".debug");
if (separate_debug_file_debug)
printf_unfiltered (_(" Trying %s\n"), link);
/* lrealpath() is expensive even for the usually non-existent files. */
if (access (link, F_OK) == 0)
filename = lrealpath (link);
@ -147,6 +150,10 @@ find_separate_debug_file_by_buildid (struct objfile *objfile)
build_id = build_id_bfd_get (objfile->obfd);
if (build_id != NULL)
{
if (separate_debug_file_debug)
printf_unfiltered (_("\nLooking for separate debug info (build-id) for "
"%s\n"), objfile_name (objfile));
gdb_bfd_ref_ptr abfd (build_id_to_debug_bfd (build_id->size,
build_id->data));
/* Prevent looping on a stripped .debug file. */

5
gdb/doc/ChangeLog
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@ -1,3 +1,8 @@
2017-06-11 Simon Marchi <simon.marchi@ericsson.com>
* gdb.texinfo (Optional Messages about Internal Happenings):
Document {set,show} debug separate-debug-file commands.
2017-06-07 Sergio Durigan Junior <sergiodj@redhat.com>
* gdb.texinfo (Starting) <startup-with-shell>: Add @anchor.

6
gdb/doc/gdb.texinfo
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@ -23984,6 +23984,12 @@ the serial line to the remote machine. The info is printed on the
@value{GDBN} standard output stream. The default is off.
@item show debug remote
Displays the state of display of remote packets.
@item set debug separate-debug-file
Turns on or off display of debug output about separate debug file search.
@item show debug separate-debug-file
Displays the state of separate debug file search debug output.
@item set debug serial
Turns on or off display of @value{GDBN} serial debugging info. The
default is off.

18
gdb/symfile.c
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@ -1333,6 +1333,10 @@ symbol_file_clear (int from_tty)
printf_unfiltered (_("No symbol file now.\n"));
}
/* See symfile.h. */
int separate_debug_file_debug = 0;
static int
separate_debug_file_exists (const char *name, unsigned long crc,
struct objfile *parent_objfile)
@ -1351,6 +1355,9 @@ separate_debug_file_exists (const char *name, unsigned long crc,
if (filename_cmp (name, objfile_name (parent_objfile)) == 0)
return 0;
if (separate_debug_file_debug)
printf_unfiltered (_(" Trying %s\n"), name);
gdb_bfd_ref_ptr abfd (gdb_bfd_open (name, gnutarget, -1));
if (abfd == NULL)
@ -1444,6 +1451,10 @@ find_separate_debug_file (const char *dir,
struct cleanup *back_to;
int ix;
if (separate_debug_file_debug)
printf_unfiltered (_("\nLooking for separate debug info (debug link) for "
"%s\n"), objfile_name (objfile));
/* Set I to std::max (strlen (canon_dir), strlen (dir)). */
i = strlen (dir);
if (canon_dir != NULL && strlen (canon_dir) > i)
@ -3975,4 +3986,11 @@ full == print messages for the executable,\n\
NULL,
NULL,
&setprintlist, &showprintlist);
add_setshow_boolean_cmd ("separate-debug-file", no_class,
&separate_debug_file_debug, _("\
Set printing of separate debug info file search debug."), _("\
Show printing of separate debug info file search debug."), _("\
When on, GDB prints the searched locations while looking for separate debug \
info files."), NULL, NULL, &setdebuglist, &showdebuglist);
}

4
gdb/symfile.h
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@ -646,4 +646,8 @@ extern void elfmdebug_build_psymtabs (struct objfile *,
extern gdb_bfd_ref_ptr find_separate_debug_file_in_section (struct objfile *);
/* True if we are printing debug output about separate debug info files. */
extern int separate_debug_file_debug;
#endif /* !defined(SYMFILE_H) */