- SchedulingPref(Sched::None),
- isDepthCurrent(false), isHeightCurrent(false), Depth(0), Height(0),
- CopyDstRC(NULL), CopySrcRC(NULL) {}
+ isUnbuffered(false), hasReservedResource(false),
+ SchedulingPref(Sched::None), isDepthCurrent(false),
+ isHeightCurrent(false), Depth(0), Height(0), TopReadyCycle(0),
+ BotReadyCycle(0), CopyDstRC(nullptr), CopySrcRC(nullptr) {}
+
+ /// \brief Boundary nodes are placeholders for the boundary of the
+ /// scheduling region.
+ ///
+ /// BoundaryNodes can have DAG edges, including Data edges, but they do not
+ /// correspond to schedulable entities (e.g. instructions) and do not have a
+ /// valid ID. Consequently, always check for boundary nodes before accessing
+ /// an assoicative data structure keyed on node ID.
+ bool isBoundaryNode() const { return NodeNum == BoundaryID; }