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1   /*
2    * Copyright (c) 2005, 2009, 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   */
60  package 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   */
67  class 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 }