Class Edge


  • final class Edge
    extends java.lang.Object
    An edge in the control flow graph of a method. Each node of this graph is a basic block, represented with the Label corresponding to its first instruction. Each edge goes from one node to another, i.e. from one basic block to another (called the predecessor and successor blocks, respectively). An edge corresponds either to a jump or ret instruction or to an exception handler.
    See Also:
    Label
    • Field Summary

      Fields 
      Modifier and Type Field Description
      (package private) static int EXCEPTION
      A control flow graph edge corresponding to an exception handler.
      (package private) int info
      Information about this control flow graph edge.
      (package private) static int JUMP
      A control flow graph edge corresponding to a jump or ret instruction.
      (package private) Edge nextEdge
      The next edge in the list of outgoing edges of a basic block.
      (package private) Label successor
      The successor block of this control flow graph edge.
    • Constructor Summary

      Constructors 
      Constructor Description
      Edge​(int info, Label successor, Edge nextEdge)
      Constructs a new Edge.
    • Method Summary

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    • Field Detail

      • info

        final int info
        Information about this control flow graph edge.
        • If ClassWriter.COMPUTE_MAXS is used, this field contains either a stack size delta (for an edge corresponding to a jump instruction), or the value EXCEPTION (for an edge corresponding to an exception handler). The stack size delta is the stack size just after the jump instruction, minus the stack size at the beginning of the predecessor basic block, i.e. the one containing the jump instruction.
        • If ClassWriter.COMPUTE_FRAMES is used, this field contains either the value JUMP (for an edge corresponding to a jump instruction), or the index, in the ClassWriter type table, of the exception type that is handled (for an edge corresponding to an exception handler).
      • successor

        final Label successor
        The successor block of this control flow graph edge.
    • Constructor Detail

      • Edge

        Edge​(int info,
             Label successor,
             Edge nextEdge)
        Constructs a new Edge.
        Parameters:
        info - see info.
        successor - see successor.
        nextEdge - see nextEdge.