/***
 * ASM: a very small and fast Java bytecode manipulation framework Copyright (c) 2000-2011 INRIA,
 * France Telecom All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted
 * provided that the following conditions are met: 1. Redistributions of source code must retain the
 * above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions
 * in binary form must reproduce the above copyright notice, this list of conditions and the
 * following disclaimer in the documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the copyright holders nor the names of its contributors may be used to
 * endorse or promote products derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
 * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.googlecode.aviator.asm;

/**
 * An edge in the control flow graph of a method body. See {@link Label Label}.
 *
 * @author Eric Bruneton
 */
class Edge {

  /**
   * Denotes a normal control flow graph edge.
   */
  static final int NORMAL = 0;

  /**
   * Denotes a control flow graph edge corresponding to an exception handler. More precisely any
   * {@link Edge} whose {@link #info} is strictly positive corresponds to an exception handler. The
   * actual value of {@link #info} is the index, in the {@link ClassWriter} type table, of the
   * exception that is catched.
   */
  static final int EXCEPTION = 0x7FFFFFFF;

  /**
   * Information about this control flow graph edge. If {@link ClassWriter#COMPUTE_MAXS} is used
   * this field is the (relative) stack size in the basic block from which this edge originates.
   * This size is equal to the stack size at the "jump" instruction to which this edge corresponds,
   * relatively to the stack size at the beginning of the originating basic block. If
   * {@link ClassWriter#COMPUTE_FRAMES} is used, this field is the kind of this control flow graph
   * edge (i.e. NORMAL or EXCEPTION).
   */
  int info;

  /**
   * The successor block of the basic block from which this edge originates.
   */
  Label successor;

  /**
   * The next edge in the list of successors of the originating basic block. See
   * {@link Label#successors successors}.
   */
  Edge next;
}
