static void
btrace_add_pc (struct thread_info *tp)
{
struct btrace_data btrace;
struct btrace_block *block;
struct regcache *regcache;
struct cleanup *cleanup;
CORE_ADDR pc;
regcache = get_thread_regcache (tp->ptid);
pc = regcache_read_pc (regcache);
btrace_data_init (&btrace);
btrace.format = BTRACE_FORMAT_BTS;
btrace.variant.bts.blocks = NULL;
cleanup = make_cleanup_btrace_data (&btrace);
block = VEC_safe_push (btrace_block_s, btrace.variant.bts.blocks, NULL);
block->begin = pc;
block->end = pc;
btrace_compute_ftrace (tp, &btrace);
do_cleanups (cleanup);
}
void
btrace_fetch (struct thread_info *tp)
{
struct btrace_thread_info *btinfo;
struct btrace_target_info *tinfo;
struct btrace_data btrace;
struct cleanup *cleanup;
int errcode;
DEBUG ("fetch thread %d (%s)", tp->num, target_pid_to_str (tp->ptid));
btinfo = &tp->btrace;
tinfo = btinfo->target;
if (tinfo == NULL)
return;
/* There's no way we could get new trace while replaying.
On the other hand, delta trace would return a partial record with the
current PC, which is the replay PC, not the last PC, as expected. */
if (btinfo->replay != NULL)
return;
btrace_data_init (&btrace);
cleanup = make_cleanup_btrace_data (&btrace);
/* Let's first try to extend the trace we already have. */
if (btinfo->end != NULL)
{
errcode = target_read_btrace (&btrace, tinfo, BTRACE_READ_DELTA);
if (errcode == 0)
{
/* Success. Let's try to stitch the traces together. */
errcode = btrace_stitch_trace (&btrace, tp);
}
else
{
/* We failed to read delta trace. Let's try to read new trace. */
errcode = target_read_btrace (&btrace, tinfo, BTRACE_READ_NEW);
/* If we got any new trace, discard what we have. */
if (errcode == 0 && !btrace_data_empty (&btrace))
btrace_clear (tp);
}
/* If we were not able to read the trace, we start over. */
if (errcode != 0)
{
btrace_clear (tp);
errcode = target_read_btrace (&btrace, tinfo, BTRACE_READ_ALL);
}
}
else
errcode = target_read_btrace (&btrace, tinfo, BTRACE_READ_ALL);
/* If we were not able to read the branch trace, signal an error. */
if (errcode != 0)
error (_("Failed to read branch trace."));
/* Compute the trace, provided we have any. */
if (!btrace_data_empty (&btrace))
{
btrace_clear_history (btinfo);
btrace_compute_ftrace (tp, &btrace);
}
do_cleanups (cleanup);
}
void
btrace_data_clear (struct btrace_data *data)
{
btrace_data_fini (data);
btrace_data_init (data);
}