void sg_cleanup(Segment* const sg)
{
tl_assert(sg);
vc_cleanup(&sg->vc);
bm_delete(sg->bm);
sg->bm = 0;
}
/** Verify whether the danger set for thread tid is up to date. Only perform
* the check if the environment variable DRD_VERIFY_DANGER_SET has been set.
*/
static Bool thread_danger_set_up_to_date(const DrdThreadId tid)
{
static int do_verify_danger_set = -1;
Bool result;
struct bitmap* computed_danger_set = 0;
if (do_verify_danger_set < 0)
{
//VG_(message)(Vg_DebugMsg, "%s", VG_(getenv)("DRD_VERIFY_DANGER_SET"));
do_verify_danger_set = VG_(getenv)("DRD_VERIFY_DANGER_SET") != 0;
}
if (do_verify_danger_set == 0)
return True;
thread_compute_danger_set(&computed_danger_set, tid);
result = bm_equal(s_danger_set, computed_danger_set);
bm_delete(computed_danger_set);
return result;
}
/** Compute a bitmap that represents the union of all memory accesses of all
* segments that are unordered to the current segment of the thread tid.
*/
static void thread_compute_danger_set(struct bitmap** danger_set,
const DrdThreadId tid)
{
Segment* p;
tl_assert(0 <= (int)tid && tid < DRD_N_THREADS
&& tid != DRD_INVALID_THREADID);
tl_assert(tid == s_drd_running_tid);
s_update_danger_set_count++;
s_danger_set_bitmap_creation_count -= bm_get_bitmap_creation_count();
s_danger_set_bitmap2_creation_count -= bm_get_bitmap2_creation_count();
if (*danger_set)
{
bm_delete(*danger_set);
}
*danger_set = bm_new();
if (s_trace_danger_set)
{
char msg[256];
VG_(snprintf)(msg, sizeof(msg),
"computing danger set for thread %d/%d with vc ",
DrdThreadIdToVgThreadId(tid), tid);
vc_snprint(msg + VG_(strlen)(msg),
sizeof(msg) - VG_(strlen)(msg),
&s_threadinfo[tid].last->vc);
VG_(message)(Vg_UserMsg, "%s", msg);
}
p = s_threadinfo[tid].last;
{
unsigned j;
if (s_trace_danger_set)
{
char msg[256];
VG_(snprintf)(msg, sizeof(msg),
"danger set: thread [%d] at vc ",
tid);
vc_snprint(msg + VG_(strlen)(msg),
sizeof(msg) - VG_(strlen)(msg),
&p->vc);
VG_(message)(Vg_UserMsg, "%s", msg);
}
for (j = 0; j < sizeof(s_threadinfo) / sizeof(s_threadinfo[0]); j++)
{
if (j != tid && IsValidDrdThreadId(j))
{
const Segment* q;
for (q = s_threadinfo[j].last; q; q = q->prev)
{
if (! vc_lte(&q->vc, &p->vc) && ! vc_lte(&p->vc, &q->vc))
{
if (s_trace_danger_set)
{
char msg[256];
VG_(snprintf)(msg, sizeof(msg),
"danger set: [%d] merging segment ", j);
vc_snprint(msg + VG_(strlen)(msg),
sizeof(msg) - VG_(strlen)(msg),
&q->vc);
VG_(message)(Vg_UserMsg, "%s", msg);
}
bm_merge2(*danger_set, q->bm);
}
else
{
if (s_trace_danger_set)
{
char msg[256];
VG_(snprintf)(msg, sizeof(msg),
"danger set: [%d] ignoring segment ", j);
vc_snprint(msg + VG_(strlen)(msg),
sizeof(msg) - VG_(strlen)(msg),
&q->vc);
VG_(message)(Vg_UserMsg, "%s", msg);
}
}
}
}
}
}
s_danger_set_bitmap_creation_count += bm_get_bitmap_creation_count();
s_danger_set_bitmap2_creation_count += bm_get_bitmap2_creation_count();
if (0 && s_trace_danger_set)
{
VG_(message)(Vg_UserMsg, "[%d] new danger set:", tid);
bm_print(*danger_set);
VG_(message)(Vg_UserMsg, "[%d] end of new danger set.", tid);
}
}