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record-btrace: provide target_find_new_threads method 

The "info threads" command tries to read memory, which is not possible during
replay.  This results in an error message and aborts the command without showing
the existing threads.

Provide a to_find_new_threads target method to skip the search while replaying.

2014-01-16  Markus Metzger  <markus.t.metzger@intel.com>

	* record-btrace.c (record_btrace_find_new_threads)
	(record_btrace_thread_alive): New.
	(init_record_btrace_ops): Initialize to_find_new_threads and
	to_thread_alive.
This commit is contained in:
Markus Metzger 2013-05-03 10:51:13 +02:00
parent b2f4cfdebc
commit e2887aa34f
2 changed files with 44 additions and 0 deletions
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7
gdb/ChangeLog
View File

@ -1,3 +1,10 @@
2014-01-16 Markus Metzger <markus.t.metzger@intel.com>
* record-btrace.c (record_btrace_find_new_threads)
(record_btrace_thread_alive): New.
(init_record_btrace_ops): Initialize to_find_new_threads and
to_thread_alive.
2014-01-16 Markus Metzger <markus.t.metzger@intel.com>
* record-btrace.c (record_btrace_resume): New.

37
gdb/record-btrace.c
View File

@ -1050,6 +1050,41 @@ record_btrace_wait (struct target_ops *ops, ptid_t ptid,
error (_("You can't do this from here. Do 'record goto end', first."));
}
/* The to_find_new_threads method of target record-btrace. */
static void
record_btrace_find_new_threads (struct target_ops *ops)
{
/* Don't expect new threads if we're replaying. */
if (record_btrace_is_replaying ())
return;
/* Forward the request. */
for (ops = ops->beneath; ops != NULL; ops = ops->beneath)
if (ops->to_find_new_threads != NULL)
{
ops->to_find_new_threads (ops);
break;
}
}
/* The to_thread_alive method of target record-btrace. */
static int
record_btrace_thread_alive (struct target_ops *ops, ptid_t ptid)
{
/* We don't add or remove threads during replay. */
if (record_btrace_is_replaying ())
return find_thread_ptid (ptid) != NULL;
/* Forward the request. */
for (ops = ops->beneath; ops != NULL; ops = ops->beneath)
if (ops->to_thread_alive != NULL)
return ops->to_thread_alive (ops, ptid);
return 0;
}
/* Initialize the record-btrace target ops. */
static void
@ -1086,6 +1121,8 @@ init_record_btrace_ops (void)
ops->to_get_unwinder = &record_btrace_frame_unwind;
ops->to_resume = record_btrace_resume;
ops->to_wait = record_btrace_wait;
ops->to_find_new_threads = record_btrace_find_new_threads;
ops->to_thread_alive = record_btrace_thread_alive;
ops->to_stratum = record_stratum;
ops->to_magic = OPS_MAGIC;
}