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Java > Open Source Codes > com > tc > asm > tree > JumpInsnNode


1 /***
2  * ASM: a very small and fast Java bytecode manipulation framework
3  * Copyright (c) 2000-2005 INRIA, France Telecom
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 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  */
30 package com.tc.asm.tree;
31
32 import com.tc.asm.Label;
33 import com.tc.asm.MethodVisitor;
34
35 /**
36  * A node that represents a jump instruction. A jump instruction is an
37  * instruction that may jump to another instruction.
38  *
39  * @author Eric Bruneton
40  */
41 public class JumpInsnNode extends AbstractInsnNode {
42
43     /**
44      * The operand of this instruction. This operand is a label that designates
45      * the instruction to which this instruction may jump.
46      */
47     public Label label;
48
49     /**
50      * Constructs a new {@link JumpInsnNode}.
51      *
52      * @param opcode the opcode of the type instruction to be constructed. This
53      * opcode must be IFEQ, IFNE, IFLT, IFGE, IFGT, IFLE, IF_ICMPEQ,
54      * IF_ICMPNE, IF_ICMPLT, IF_ICMPGE, IF_ICMPGT, IF_ICMPLE, IF_ACMPEQ,
55      * IF_ACMPNE, GOTO, JSR, IFNULL or IFNONNULL.
56      * @param label the operand of the instruction to be constructed. This
57      * operand is a label that designates the instruction to which the
58      * jump instruction may jump.
59      */
60     public JumpInsnNode(final int opcode, final Label label) {
61         super(opcode);
62         this.label = label;
63     }
64
65     /**
66      * Sets the opcode of this instruction.
67      *
68      * @param opcode the new instruction opcode. This opcode must be IFEQ, IFNE,
69      * IFLT, IFGE, IFGT, IFLE, IF_ICMPEQ, IF_ICMPNE, IF_ICMPLT,
70      * IF_ICMPGE, IF_ICMPGT, IF_ICMPLE, IF_ACMPEQ, IF_ACMPNE, GOTO, JSR,
71      * IFNULL or IFNONNULL.
72      */
73     public void setOpcode(final int opcode) {
74         this.opcode = opcode;
75     }
76
77     public void accept(final MethodVisitor mv) {
78         mv.visitJumpInsn(opcode, label);
79     }
80
81     public int getType() {
82         return JUMP_INSN;
83     }
84 }
85
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