+ inline void toNext() {
+ do {
+ std::pair<PointerIntTy, ChildItTy> &Top = VisitStack.back();
+ NodeType *Node = Top.first.getPointer();
+ ChildItTy &It = Top.second;
+ if (!Top.first.getInt()) {
+ // now retrieve the real begin of the children before we dive in
+ It = GT::child_begin(Node);
+ Top.first.setInt(1);
+ }
+
+ while (It != GT::child_end(Node)) {
+ NodeType *Next = *It++;
+ // Has our next sibling been visited?
+ if (Next && this->Visited.insert(Next).second) {
+ // No, do it now.
+ VisitStack.push_back(
+ std::make_pair(PointerIntTy(Next, 0), GT::child_begin(Next)));
+ return;
+ }
+ }
+
+ // Oops, ran out of successors... go up a level on the stack.
+ VisitStack.pop_back();
+ } while (!VisitStack.empty());
+ }
+