void IR_GVN::clean()
{
m_vn_count = 1;
if (m_md2vn.get_bucket_size() != 0) {
m_md2vn.clean();
}
if (m_ll2vn.get_bucket_size() != 0) {
m_ll2vn.clean();
}
if (m_fp2vn.get_bucket_size() != 0) {
m_fp2vn.clean();
}
if (m_str2vn.get_bucket_size() != 0) {
m_str2vn.clean();
}
BITSET inlst;
for (INT k = 0; k <= m_ir2vn.get_last_idx(); k++) {
VN * x = m_ir2vn.get(k);
if (x != NULL && !inlst.is_contain(VN_id(x))) {
inlst.bunion(VN_id(x));
m_free_lst.append_tail(x);
}
}
m_ir2vn.clean();
for (SVECTOR<VN*> * v = m_vnvec_lst.get_head();
v != NULL; v = m_vnvec_lst.get_next()) {
v->clean();
}
m_def2ildtab.clean();
m_def2arrtab.clean();
m_def2sctab.clean();
m_stmt2domdef.clean();
m_zero_vn = NULL;
}
//Record IR list into 'irset'.
void CFS_MGR::record_ir_stmt(IR * ir_list, BITSET & irset)
{
while (ir_list != NULL) {
irset.bunion(IR_id(ir_list));
ir_list = IR_next(ir_list);
}
}
void DGRAPH::_remove_unreach_node(UINT id, BITSET & visited)
{
visited.bunion(id);
VERTEX * vex = get_vertex(id);
EDGE_C * el = VERTEX_out_list(vex);
while (el != NULL) {
UINT succ = VERTEX_id(EDGE_to(EC_edge(el)));
if (!visited.is_contain(succ)) {
_remove_unreach_node(succ, visited);
}
el = EC_next(el);
}
}
bool GRAPH::is_equal(GRAPH & g)
{
if (get_vertex_num() != g.get_vertex_num() ||
get_edge_num() != g.get_edge_num()) {
return false;
}
BITSET vs;
INT c;
for (VERTEX * v1 = get_first_vertex(c);
v1 != NULL; v1 = get_next_vertex(c)) {
VERTEX * v2 = g.get_vertex(VERTEX_id(v1));
if (v2 == NULL) {
return false;
}
vs.clean();
EDGE_C * el = VERTEX_out_list(v1);
EDGE * e = NULL;
UINT v1_succ_n = 0;
if (el == NULL) {
if (VERTEX_out_list(v2) != NULL) {
return false;
}
continue;
}
for (e = EC_edge(el); e != NULL; el = EC_next(el),
e = el ? EC_edge(el) : NULL) {
vs.bunion(VERTEX_id(EDGE_to(e)));
v1_succ_n++;
}
UINT v2_succ_n = 0;
el = VERTEX_out_list(v2);
for (e = EC_edge(el); e != NULL; el = EC_next(el),
e = el ? EC_edge(el) : NULL) {
v2_succ_n++;
if (!vs.is_contain(VERTEX_id(EDGE_to(e)))) {
return false;
}
}
if (v1_succ_n != v2_succ_n) {
return false;
}
}
return true;
}
/*
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;
}
/*
Remove transitive edge.
e.g: Given edges of G, there are v1->v2->v3, v1->v3, then v1->v3 named
transitive edge.
Algo:
INPUT: Graph with N edges.
1. Sort vertices in topological order.
2. Associate each edges with indicator respective,
and recording them in one matrix(N*N)
e.g: e1:v0->v2, e2:v1->v2, e3:v0->v1
0 1 2
0 -- e3 e1
1 -- -- e2
2 -- -- --
3. Scan vertices according to toplogical order,
remove all edges which the target-node has been
marked at else rows.
e.g: There are dependence edges: v0->v1, v0->v2.
If v1->v2 has been marked, we said v0->v2 is removable,
and the same goes for the rest of edges.
*/
void GRAPH::remove_transitive_edge()
{
BITSET_MGR bs_mgr;
SVECTOR<UINT> vex_vec;
sort_in_toplog_order(vex_vec, true);
SVECTOR<UINT> vid2pos_in_bitset_map; //Map from VERTEX-ID to BITSET.
INT i;
//Mapping vertex id to its position in 'vex_vec'.
for (i = 0; i <= vex_vec.get_last_idx(); i++) {
vid2pos_in_bitset_map.set(vex_vec.get(i), i);
}
//Associate each edges with indicator respective.
UINT vex_num = get_vertex_num();
SVECTOR<BITSET*> edge_indicator; //container of bitset.
INT c;
for (EDGE * e = m_edges.get_first(c); e != NULL; e = m_edges.get_next(c)) {
UINT from = VERTEX_id(EDGE_from(e));
UINT to = VERTEX_id(EDGE_to(e));
UINT frompos = vid2pos_in_bitset_map.get(from);
BITSET * bs = edge_indicator.get(frompos);
if (bs == NULL) {
bs = bs_mgr.create();
edge_indicator.set(frompos, bs);
}
//Each from-vertex is associated with
//a bitset to record all to-vertices.
bs->bunion(vid2pos_in_bitset_map.get(to));
} //end for each of edge
//Scanning vertexs in topological order.
for (i = 0; i < vex_vec.get_last_idx(); i++) {
//Get the successor vector.
BITSET * bs = edge_indicator.get(i);
if (bs != NULL && bs->get_elem_count() >= 2) {
//Do NOT remove the first edge. Position in bitset
//has been sorted in topological order.
for (INT pos_i = bs->get_first(); pos_i >= 0;
pos_i = bs->get_next(pos_i)) {
INT kid_from_vid = vex_vec.get(pos_i);
INT kid_from_pos = vid2pos_in_bitset_map.get(kid_from_vid);
//Get bitset that 'pos_i' associated.
BITSET * kid_from_bs = edge_indicator.get(kid_from_pos);
if (kid_from_bs != NULL) {
for (INT pos_j = bs->get_next(pos_i); pos_j >= 0;
pos_j = bs->get_next(pos_j)) {
if (kid_from_bs->is_contain(pos_j)) {
//The edge 'i->pos_j' is redundant.
INT to_vid = vex_vec.get(pos_j);
UINT src_vid = vex_vec.get(i);
remove_edge(get_edge(src_vid, to_vid));
bs->diff(pos_j);
}
}
} //end if
} //end for
} //end if
} //end for each vertex
}
bool DGRAPH::compute_ipdom()
{
bool change = true;
//Initialize ipdom-set for each BB.
m_ipdom_set.clean();
//Processing in reverse-topological order.
INT c;
for (VERTEX * v = m_vertexs.get_last(c);
v != NULL; v = m_vertexs.get_prev(c)) {
INT cur_id = VERTEX_id(v);
if (is_graph_exit(v)) {
continue;
} else if (m_pdom_set.get(cur_id)->get_elem_count() > 1) {
BITSET * p = m_pdom_set.get(cur_id);
IS_TRUE(p != NULL, ("should compute pdom first"));
if (p->get_elem_count() == 1) {
//There is no ipdom if 'pdom' set only contain itself.
IS_TRUE0(m_ipdom_set.get(cur_id) == 0);
continue;
}
p->diff(cur_id);
#define TRICKY_METHOD
#ifdef TRICKY_METHOD
INT i;
for (i = p->get_first(); i != -1; i = p->get_next(i)) {
if (m_pdom_set.get(i)->is_equal(*p)) {
IS_TRUE0(m_ipdom_set.get(cur_id) == 0);
m_ipdom_set.set(cur_id, i);
break;
}
}
//IS_TRUE(i != -1, ("not find ipdom")); //Not find.
#else
/*
//Then , we can find a node which is not
//post-dominate any other elems reside in 'tmp'.
for (INT i = tmp.get_first(); i != -1; i = tmp.get_next(i)) {
for (INT j = tmp.get_first(); j != -1; j = tmp.get_next(j)) {
if (i == j) {
continue;
}
if (m_pdom_set.get(j)->is_contain(i)) {
tmp.diff(i);
i = tmp.get_first();
j = i;
} //end if
} //end for
} //end for
//There is only one elemment in 'tmp'
IS_TRUE(tmp.get_elem_count() == 1, ("illegal in compute_ipdom"));
INT i = tmp.get_first();
IS_TRUE(i != -1, ("cannot find ipdom of BB:%d", cur_id));
IS_TRUE(m_ipdom_set.get(cur_id) == 0,
("recompute ipdom for BB:%d", cur_id));
m_ipdom_set.set(cur_id, i);
*/
#endif
p->bunion(cur_id);
} //end else if
} //end for
return true;
}
bool DGRAPH::compute_idom()
{
bool change = true;
//Initialize idom-set for each BB.
m_idom_set.clean();
//Access with topological order.
INT c;
for (VERTEX * v = m_vertexs.get_first(c);
v != NULL; v = m_vertexs.get_next(c)) {
INT cur_id = VERTEX_id(v);
if (is_graph_entry(v)) {
continue;
} else if (m_dom_set.get(cur_id)->get_elem_count() >= 2) {
BITSET * p = m_dom_set.get(cur_id);
IS_TRUE(p != NULL, ("should compute dom first"));
if (p->get_elem_count() == 1) {
//There is no idom if 'dom' set only contain itself.
IS_TRUE0(m_idom_set.get(cur_id) == 0);
continue;
}
p->diff(cur_id);
#define TRICKY_METHOD
#ifdef TRICKY_METHOD
INT i;
for (i = p->get_first(); i != -1; i = p->get_next(i)) {
if (m_dom_set.get(i)->is_equal(*p)) {
IS_TRUE0(m_idom_set.get(cur_id) == 0);
m_idom_set.set(cur_id, i);
break;
}
}
IS_TRUE(i != -1, ("not find idom?"));
#else
/*
We can find a node that is not dominate any other elems in 'tmp'.
INT i;
for (i = tmp.get_first(); i != -1; i = tmp.get_next(i)) {
for (INT j = tmp.get_first(); j != -1; j = tmp.get_next(j)) {
if (i == j) {
continue;
}
if (m_dom_set.get(j)->is_contain(i)) {
tmp.diff(i);
//Search 'tmp' over again.
i = tmp.get_first();
j = i;
}
}
}
//There is only one elemment in 'tmp'
i = tmp.get_first();
IS_TRUE(i != -1, ("cannot find idom of BB:%d", cur_id));
IS_TRUE(m_idom_set.get(cur_id) == 0, ("recompute idom for BB:%d", cur_id));
m_idom_set.set(cur_id, i);
*/
#endif
p->bunion(cur_id);
} //end else if
} //end for
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;
}