// ASM: a very small and fast Java bytecode manipulation framework
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package org.springframework.asm;

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.
Author:
Eric Bruneton
See Also:
Label/**
 * 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 Label
 * @author Eric Bruneton
 */
final class Edge {

  
A control flow graph edge corresponding to a jump or ret instruction. Only used with ClassWriter.COMPUTE_FRAMES. /**
   * A control flow graph edge corresponding to a jump or ret instruction. Only used with {@link
   * ClassWriter#COMPUTE_FRAMES}.
   */
  static final int JUMP = 0;

  
A control flow graph edge corresponding to an exception handler. Only used with ClassWriter.COMPUTE_MAXS. /**
   * A control flow graph edge corresponding to an exception handler. Only used with {@link
   * ClassWriter#COMPUTE_MAXS}.
   */
  static final int EXCEPTION = 0x7FFFFFFF;

  
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). 
/**
   * Information about this control flow graph edge.
   *
   * <ul>
   *   <li>If {@link 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.
   *   <li>If {@link 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 {@link
   *       ClassWriter} type table, of the exception type that is handled (for an edge corresponding
   *       to an exception handler).
   * </ul>
   */
  final int info;

  
The successor block of this control flow graph edge. /** The successor block of this control flow graph edge. */
  final Label successor;

  
The next edge in the list of outgoing edges of a basic block. See Label.outgoingEdges. /**
   * The next edge in the list of outgoing edges of a basic block. See {@link Label#outgoingEdges}.
   */
  Edge nextEdge;

  
Constructs a new Edge.
Params:
info – see info.
successor – see successor.
nextEdge – see nextEdge./**
   * Constructs a new Edge.
   *
   * @param info see {@link #info}.
   * @param successor see {@link #successor}.
   * @param nextEdge see {@link #nextEdge}.
   */
  Edge(final int info, final Label successor, final Edge nextEdge) {
    this.info = info;
    this.successor = successor;
    this.nextEdge = nextEdge;
  }
}