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This patch adds a new convenience variable called "$_exitsignal", which

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will hold the signal number when the inferior terminates due to the
uncaught signal.

I've made modifications on infrun.c:handle_inferior_event such that
$_exitcode gets cleared when the inferior signalled, and vice-versa.
This assumption was made because the variables are mutually
exclusive, i.e., when the inferior terminates because of an uncaught
signal it is not possible for it to return.  I have also made modifications
such that when a corefile is loaded, $_exitsignal gets set to the uncaught
signal that "killed" the inferior, and $_exitcode is cleared.

The patch also adds a NEWS entry, documentation bits, and a testcase.  The
documentation entry explains how to use $_exitsignal and $_exitcode in a
GDB script, by making use of the new $_isvoid convenience function.

gdb/
2013-10-06  Sergio Durigan Junior  <sergiodj@redhat.com>

	* NEWS: Mention new convenience variable $_exitsignal.
	* corelow.c (core_open): Reset exit convenience variables.  Set
	$_exitsignal to the uncaught signal which generated the corefile.
	* infrun.c (handle_inferior_event): Reset exit convenience
	variables.  Set $_exitsignal for TARGET_WAITKIND_SIGNALLED.
	(clear_exit_convenience_vars): New function.
	* inferior.h (clear_exit_convenience_vars): New prototype.

gdb/testsuite/
2013-10-06  Sergio Durigan Junior  <sergiodj@redhat.com>

	* gdb.base/corefile.exp: Test whether $_exitsignal is set and
	$_exitcode is void when opening a corefile.
	* gdb.base/exitsignal.exp: New file.
	* gdb.base/segv.c: Likewise.
	* gdb.base/normal.c: Likewise.

gdb/doc/
2013-10-06  Sergio Durigan Junior  <sergiodj@redhat.com>

	* gdb.texinfo (Convenience Variables): Document $_exitsignal.
	Update entry for $_exitcode.
This commit is contained in:
Sergio Durigan Junior
2013-10-07 05:34:11 +00:00
parent f872dc3d6e
commit 0c5571793a
12 changed files with 308 additions and 3 deletions
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41
gdb/infrun.c
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@@ -3426,6 +3426,9 @@ handle_inferior_event (struct execution_control_state *ecs)
handle_vfork_child_exec_or_exit (0);
target_terminal_ours (); /* Must do this before mourn anyway. */
/* Clearing any previous state of convenience variables. */
clear_exit_convenience_vars ();
if (ecs->ws.kind == TARGET_WAITKIND_EXITED)
{
/* Record the exit code in the convenience variable $_exitcode, so
@@ -3440,7 +3443,34 @@ handle_inferior_event (struct execution_control_state *ecs)
print_exited_reason (ecs->ws.value.integer);
}
else
print_signal_exited_reason (ecs->ws.value.sig);
{
struct regcache *regcache = get_thread_regcache (ecs->ptid);
struct gdbarch *gdbarch = get_regcache_arch (regcache);
if (gdbarch_gdb_signal_to_target_p (gdbarch))
{
/* Set the value of the internal variable $_exitsignal,
which holds the signal uncaught by the inferior. */
set_internalvar_integer (lookup_internalvar ("_exitsignal"),
gdbarch_gdb_signal_to_target (gdbarch,
ecs->ws.value.sig));
}
else
{
/* We don't have access to the target's method used for
converting between signal numbers (GDB's internal
representation <-> target's representation).
Therefore, we cannot do a good job at displaying this
information to the user. It's better to just warn
her about it (if infrun debugging is enabled), and
give up. */
if (debug_infrun)
fprintf_filtered (gdb_stdlog, _("\
Cannot fill $_exitsignal with the correct signal number.\n"));
}
print_signal_exited_reason (ecs->ws.value.sig);
}
gdb_flush (gdb_stdout);
target_mourn_inferior ();
@@ -7061,6 +7091,15 @@ save_inferior_ptid (void)
*saved_ptid_ptr = inferior_ptid;
return make_cleanup (restore_inferior_ptid, saved_ptid_ptr);
}
/* See inferior.h. */
void
clear_exit_convenience_vars (void)
{
clear_internalvar (lookup_internalvar ("_exitsignal"));
clear_internalvar (lookup_internalvar ("_exitcode"));
}
/* User interface for reverse debugging: