/*
Vertexs should have been sorted in topological order.
And we access them by reverse-topological order.
'vlst': compute dominator for vertices in vlst if it
is not empty or else compute all graph.
'uni': universe.
*/
bool DGRAPH::compute_dom(IN LIST<VERTEX*> * vlst, BITSET const* uni)
{
LIST<VERTEX*> tmpvlst;
LIST<VERTEX*> * pvlst = &tmpvlst;
if (vlst != NULL) {
pvlst = vlst;
} else {
INT c;
for (VERTEX * u = get_first_vertex(c);
u != NULL; u = get_next_vertex(c)) {
pvlst->append_tail(u);
}
}
BITSET const* luni = NULL;
if (uni != NULL) {
luni = uni;
} else {
BITSET * x = new BITSET();
for (VERTEX * u = pvlst->get_head();
u != NULL; u = pvlst->get_next()) {
x->bunion(VERTEX_id(u));
}
luni = x;
}
//Initialize dom-set for each BB.
for (VERTEX * v = pvlst->get_head();
v != NULL; v = pvlst->get_next()) {
if (is_graph_entry(v)) {
BITSET * dom = get_dom_set(v);
dom->clean();
dom->bunion(VERTEX_id(v));
} else {
get_dom_set(v)->copy(*luni);
}
}
/*
DOM[entry] = {entry}
DOM[n] = {n} ¡È { ¡É(DOM[pred] of predecessor of 'n') }
*/
bool change = true;
BITSET tmp;
UINT count = 0;
while (change && count < 10) {
count++;
change = false;
for (VERTEX * v = pvlst->get_head();
v != NULL; v = pvlst->get_next()) {
UINT vid = VERTEX_id(v);
if (is_graph_entry(v)) {
continue;
} else {
//Access each preds
EDGE_C * ec = VERTEX_in_list(v);
while (ec != NULL) {
VERTEX * pred = EDGE_from(EC_edge(ec));
if (ec == VERTEX_in_list(v)) {
tmp.copy(*m_dom_set.get(VERTEX_id(pred)));
} else {
tmp.intersect(*m_dom_set.get(VERTEX_id(pred)));
}
ec = EC_next(ec);
}
tmp.bunion(vid);
BITSET * dom = m_dom_set.get(VERTEX_id(v));
if (!dom->is_equal(tmp)) {
dom->copy(tmp);
change = true;
}
} //end else
} //end for
}//end while
IS_TRUE0(!change);
if (uni == NULL && luni != NULL) {
delete luni;
}
return true;
}
//Vertexs should have been sorted in topological order.
//And we access them by reverse-topological order.
bool DGRAPH::compute_pdom(IN LIST<VERTEX*> * vlst, BITSET const* uni)
{
LIST<VERTEX*> tmpvlst;
LIST<VERTEX*> * pvlst = &tmpvlst;
if (vlst != NULL) {
pvlst = vlst;
} else {
INT c;
for (VERTEX * v = get_first_vertex(c);
v != NULL; v = get_next_vertex(c)) {
pvlst->append_tail(v);
}
}
BITSET const* luni = NULL;
if (uni != NULL) {
luni = uni;
} else {
BITSET * x = new BITSET();
for (VERTEX * u = pvlst->get_head();
u != NULL; u = pvlst->get_next()) {
x->bunion(VERTEX_id(u));
}
luni = x;
}
//Initialize pdom for each bb
for (VERTEX * v = pvlst->get_head();
v != NULL; v = pvlst->get_next()) {
if (is_graph_exit(v)) {
BITSET * pdom = get_pdom_set(v);
pdom->clean();
pdom->bunion(VERTEX_id(v));
} else {
get_pdom_set(v)->copy(*luni);
}
}
/*
PDOM[exit] = {exit}
PDOM[n] = {n} U {¡É(PDOM[succ] of each succ of n)}
*/
bool change = true;
BITSET tmp;
UINT count = 0;
while (change && count < 10) {
count++;
change = false;
for (VERTEX * v = pvlst->get_head();
v != NULL; v = pvlst->get_next()) {
UINT vid = VERTEX_id(v);
if (is_graph_exit(v)) {
continue;
} else {
tmp.clean();
//Access each succs
EDGE_C * ec = VERTEX_out_list(v);
while (ec != NULL) {
VERTEX * succ = EDGE_to(EC_edge(ec));
if (ec == VERTEX_out_list(v)) {
tmp.copy(*m_pdom_set.get(VERTEX_id(succ)));
} else {
tmp.intersect(*m_pdom_set.get(VERTEX_id(succ)));
}
ec = EC_next(ec);
}
tmp.bunion(vid);
BITSET * pdom = m_pdom_set.get(VERTEX_id(v));
if (!pdom->is_equal(tmp)) {
pdom->copy(tmp);
change = true;
}
}
} //end for
}// end while
IS_TRUE0(!change);
if (uni == NULL && luni != NULL) {
delete luni;
}
return true;
}
