1/*
2 * Copyright (c) 2005, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26/*
27 * This file is available under and governed by the GNU General Public
28 * License version 2 only, as published by the Free Software Foundation.
29 * However, the following notice accompanied the original version of this
30 * file:
31 *
32 * ASM: a very small and fast Java bytecode manipulation framework
33 * Copyright (c) 2000-2007 INRIA, France Telecom
34 * All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 * 1. Redistributions of source code must retain the above copyright
40 *    notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 *    notice, this list of conditions and the following disclaimer in the
43 *    documentation and/or other materials provided with the distribution.
44 * 3. Neither the name of the copyright holders nor the names of its
45 *    contributors may be used to endorse or promote products derived from
46 *    this software without specific prior written permission.
47 *
48 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
49 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
52 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
53 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
54 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
55 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
56 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
57 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
58 * THE POSSIBILITY OF SUCH DAMAGE.
59 */
60package com.sun.xml.internal.ws.org.objectweb.asm;
61
62/**
63 * An edge in the control flow graph of a method body. See {@link Label Label}.
64 *
65 * @author Eric Bruneton
66 */
67class Edge {
68
69    /**
70     * Denotes a normal control flow graph edge.
71     */
72    static final int NORMAL = 0;
73
74    /**
75     * Denotes a control flow graph edge corresponding to an exception handler.
76     * More precisely any {@link Edge} whose {@link #info} is strictly positive
77     * corresponds to an exception handler. The actual value of {@link #info} is
78     * the index, in the {@link ClassWriter} type table, of the exception that
79     * is catched.
80     */
81    static final int EXCEPTION = 0x7FFFFFFF;
82
83    /**
84     * Information about this control flow graph edge. If
85     * {@link ClassWriter#COMPUTE_MAXS} is used this field is the (relative)
86     * stack size in the basic block from which this edge originates. This size
87     * is equal to the stack size at the "jump" instruction to which this edge
88     * corresponds, relatively to the stack size at the beginning of the
89     * originating basic block. If {@link ClassWriter#COMPUTE_FRAMES} is used,
90     * this field is the kind of this control flow graph edge (i.e. NORMAL or
91     * EXCEPTION).
92     */
93    int info;
94
95    /**
96     * The successor block of the basic block from which this edge originates.
97     */
98    Label successor;
99
100    /**
101     * The next edge in the list of successors of the originating basic block.
102     * See {@link Label#successors successors}.
103     */
104    Edge next;
105}
106