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gdb: additional debug output in infrun.c and linux-nat.c

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While working on some of the recent patches relating to vfork handling
I found this debug output very helpful, I'd like to propose adding
this into GDB.

With debug turned off there should be no user visible changes after
this commit.
This commit is contained in:
Andrew Burgess
2023-06-18 20:31:48 +01:00
parent d3a2163ee2
commit b26b06dd42
2 changed files with 43 additions and 8 deletions
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23
gdb/linux-nat.c
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@ -1293,6 +1293,11 @@ get_detach_signal (struct lwp_info *lp)
static void
detach_one_lwp (struct lwp_info *lp, int *signo_p)
{
LINUX_NAT_SCOPED_DEBUG_ENTER_EXIT;
linux_nat_debug_printf ("lwp %s (stopped = %d)",
lp->ptid.to_string ().c_str (), lp->stopped);
int lwpid = lp->ptid.lwp ();
int signo;
@ -1363,6 +1368,10 @@ detach_one_lwp (struct lwp_info *lp, int *signo_p)
else
signo = *signo_p;
linux_nat_debug_printf ("preparing to resume lwp %s (stopped = %d)",
lp->ptid.to_string ().c_str (),
lp->stopped);
/* Preparing to resume may try to write registers, and fail if the
lwp is zombie. If that happens, ignore the error. We'll handle
it below, when detach fails with ESRCH. */
@ -1395,6 +1404,8 @@ detach_callback (struct lwp_info *lp)
void
linux_nat_target::detach (inferior *inf, int from_tty)
{
LINUX_NAT_SCOPED_DEBUG_ENTER_EXIT;
struct lwp_info *main_lwp;
int pid = inf->pid;
@ -3122,13 +3133,13 @@ static ptid_t
linux_nat_wait_1 (ptid_t ptid, struct target_waitstatus *ourstatus,
target_wait_flags target_options)
{
LINUX_NAT_SCOPED_DEBUG_ENTER_EXIT;
sigset_t prev_mask;
enum resume_kind last_resume_kind;
struct lwp_info *lp;
int status;
linux_nat_debug_printf ("enter");
/* The first time we get here after starting a new inferior, we may
not have added it to the LWP list yet - this is the earliest
moment at which we know its PID. */
@ -3228,7 +3239,7 @@ linux_nat_wait_1 (ptid_t ptid, struct target_waitstatus *ourstatus,
if (target_options & TARGET_WNOHANG)
{
linux_nat_debug_printf ("exit (ignore)");
linux_nat_debug_printf ("no interesting events found");
ourstatus->set_ignore ();
restore_child_signals_mask (&prev_mask);
@ -3314,7 +3325,7 @@ linux_nat_wait_1 (ptid_t ptid, struct target_waitstatus *ourstatus,
else
*ourstatus = host_status_to_waitstatus (status);
linux_nat_debug_printf ("exit");
linux_nat_debug_printf ("event found");
restore_child_signals_mask (&prev_mask);
@ -3410,6 +3421,8 @@ ptid_t
linux_nat_target::wait (ptid_t ptid, struct target_waitstatus *ourstatus,
target_wait_flags target_options)
{
LINUX_NAT_SCOPED_DEBUG_ENTER_EXIT;
ptid_t event_ptid;
linux_nat_debug_printf ("[%s], [%s]", ptid.to_string ().c_str (),
@ -3589,6 +3602,8 @@ linux_nat_target::kill ()
void
linux_nat_target::mourn_inferior ()
{
LINUX_NAT_SCOPED_DEBUG_ENTER_EXIT;
int pid = inferior_ptid.pid ();
purge_lwp_list (pid);