01: /***
02: * ASM: a very small and fast Java bytecode manipulation framework
03: * Copyright (c) 2000-2005 INRIA, France Telecom
04: * All rights reserved.
05: *
06: * Redistribution and use in source and binary forms, with or without
07: * modification, are permitted provided that the following conditions
08: * are met:
09: * 1. Redistributions of source code must retain the above copyright
10: * notice, this list of conditions and the following disclaimer.
11: * 2. Redistributions in binary form must reproduce the above copyright
12: * notice, this list of conditions and the following disclaimer in the
13: * documentation and/or other materials provided with the distribution.
14: * 3. Neither the name of the copyright holders nor the names of its
15: * contributors may be used to endorse or promote products derived from
16: * this software without specific prior written permission.
17: *
18: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19: * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21: * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
22: * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
28: * THE POSSIBILITY OF SUCH DAMAGE.
29: */package org.objectweb.asm;
30:
31: /**
32: * An edge in the control flow graph of a method body. See {@link Label Label}.
33: *
34: * @author Eric Bruneton
35: */
36: class Edge {
37:
38: /**
39: * Denotes a control flow graph edge corresponding to a JSR instruction.
40: */
41: final static int JSR = -1;
42:
43: /**
44: * Denotes a normal control flow graph edge.
45: */
46: final static int NORMAL = 0;
47:
48: /**
49: * Denotes a control flow graph edge corresponding to an exception handler.
50: * More precisely any {@link Edge} whose {@link #info} is strictly positive
51: * corresponds to an exception handler. The actual value of {@link #info} is
52: * the index, in the {@link ClassWriter} type table, of the exception that
53: * is catched.
54: */
55: final static int EXCEPTION = 1;
56:
57: /**
58: * Information about this control flow graph edge. If
59: * {@link ClassWriter#COMPUTE_MAXS} is used this field is the (relative)
60: * stack size in the basic block from which this edge originates. This size
61: * is equal to the stack size at the "jump" instruction to which this edge
62: * corresponds, relatively to the stack size at the beginning of the
63: * originating basic block. If {@link ClassWriter#COMPUTE_FRAMES} is used,
64: * this field is the kind of this control flow graph edge (i.e. JSR, NORMAL
65: * or EXCEPTION).
66: */
67: int info;
68:
69: /**
70: * The successor block of the basic block from which this edge originates.
71: */
72: Label successor;
73:
74: /**
75: * The next edge in the list of successors of the originating basic block.
76: * See {@link Label#successors successors}.
77: */
78: Edge next;
79: }
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