/* process unification constraints */
protected void process(UnifyConstraint c) {
Node n1 = c.node1.getRep();
Node n2 = c.node2.getRep();
assert (n1.graph == this);
assert (n2.graph == this);
if (n1 == n2) return;
if (heapfix && n2.isheap && !n1.isheap) {
Node sw = n1;
n1 = n2;
n2 = sw;
}
n1.mergeTags(n2);
n1.mergeFlags(n2);
n2.parent = n1;
n2.tag = null;
n2.region = null;
if (secondary_index[0]) {
for (FieldEdge e : n2.outfields.values()) {
assert (e.src == n2);
if (e.dst == n2) w.addLast(new FieldConstraint(n1, n1, e.field));
else {
w.addLast(new FieldConstraint(n1, e.dst, e.field));
e.dst.infields.get(e.field).remove(e);
}
fedges.get(e.field).remove(e);
}
for (Field f : n2.infields.keySet())
for (FieldEdge e : n2.infields.get(f)) {
assert (e.dst == n2);
e.dst = n1;
addInField(n1, f, e);
}
n2.outfields = null;
n2.infields = null;
} else {
HashSet<FieldEdge> fremove = new HashSet<FieldEdge>();
for (Field f : fedges.keySet()) {
Collection<FieldEdge> fed = fedges.get(f);
int size = fed.size();
fremove.clear();
for (FieldEdge e : fed) {
if (e.src == n2) {
if (e.dst == n2) w.addLast(new FieldConstraint(n1, n1, e.field));
else w.addLast(new FieldConstraint(n1, e.dst, e.field));
} else {
if (e.dst == n2) e.dst = n1;
continue;
}
if (!fremove.contains(e)) {
fremove.add(e);
size--;
}
}
fed.removeAll(fremove);
assert (fed.size() == size);
}
}
HashSet<CallEdge> cremove = new HashSet<CallEdge>();
for (Call ce : cedges.keySet()) {
Collection<CallEdge> ced = cedges.get(ce);
cremove.clear();
int size = ced.size();
for (CallEdge e : ced) {
if (e.dst == n2) {
if (e.src == n2) w.addLast(new CallConstraint(n1, n1, e.call));
else w.addLast(new CallConstraint(e.src, n1, e.call));
} else {
if (e.src == n2) e.src = n1;
continue;
}
if (!cremove.contains(e)) {
cremove.add(e);
size--;
}
}
ced.removeAll(cremove);
assert (ced.size() == size);
}
}
