Java example source code file (Edge.java)

This example Java source code file (Edge.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

edge, exception, label, normal

The Edge.java Java example source code

/***
 * 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 clojure.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;
}