40   class Loop {
42     Loop* parent() const { return parent_; }  in parent()
43     const ZoneVector<Loop*>& children() const { return children_; }  in children()
54     explicit Loop(Zone* zone)  in Loop()  function
62     Loop* parent_;
64     ZoneVector<Loop*> children_;
72   Loop* ContainingLoop(Node* node) {  in ContainingLoop()
80   bool Contains(Loop* loop, Node* node) {  in Contains()
81     for (Loop* c = ContainingLoop(node); c != nullptr; c = c->parent_) {  in Contains()
88   const ZoneVector<Loop*>& outer_loops() const { return outer_loops_; }  in outer_loops()
91   int LoopNum(Loop* loop) const {  in LoopNum()
96   NodeRange HeaderNodes(Loop* loop) {  in HeaderNodes()
102   Node* HeaderNode(Loop* loop);
105   NodeRange BodyNodes(Loop* loop) {  in BodyNodes()
111   NodeRange ExitNodes(Loop* loop) {  in ExitNodes()
117   NodeRange LoopNodes(Loop* loop) {  in LoopNodes()
123   Node* GetLoopControl(Loop* loop) {  in GetLoopControl()
136   Loop* NewLoop() {  in NewLoop()
137     all_loops_.push_back(Loop(zone_));  in NewLoop()
138     Loop* result = &all_loops_.back();  in NewLoop()
142   void SetParent(Loop* parent, Loop* child) {  in SetParent()
153   ZoneVector<Loop*> outer_loops_;
154   ZoneVector<Loop> all_loops_;