1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * https://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19 package org.apache.bcel.generic;
20
21 import java.io.DataOutputStream;
22 import java.io.IOException;
23
24 import org.apache.bcel.util.ByteSequence;
25
26 /**
27 * BIPUSH - Push byte on stack
28 *
29 * <PRE>
30 * Stack: ... -> ..., value
31 * </PRE>
32 */
33 public class BIPUSH extends Instruction implements ConstantPushInstruction {
34
35 private byte b;
36
37 /**
38 * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.
39 */
40 BIPUSH() {
41 }
42
43 /**
44 * Push byte on stack
45 */
46 public BIPUSH(final byte b) {
47 super(org.apache.bcel.Const.BIPUSH, (short) 2);
48 this.b = b;
49 }
50
51 /**
52 * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call
53 * methods according to the class hierarchy in descending order, i.e., the most specific visitXXX() call comes last.
54 *
55 * @param v Visitor object
56 */
57 @Override
58 public void accept(final Visitor v) {
59 v.visitPushInstruction(this);
60 v.visitStackProducer(this);
61 v.visitTypedInstruction(this);
62 v.visitConstantPushInstruction(this);
63 v.visitBIPUSH(this);
64 }
65
66 /**
67 * Dump instruction as byte code to stream out.
68 */
69 @Override
70 public void dump(final DataOutputStream out) throws IOException {
71 super.dump(out);
72 out.writeByte(b);
73 }
74
75 /**
76 * @return Type.BYTE
77 */
78 @Override
79 public Type getType(final ConstantPoolGen cp) {
80 return Type.BYTE;
81 }
82
83 @Override
84 public Number getValue() {
85 return Integer.valueOf(b);
86 }
87
88 /**
89 * Reads needed data (for example index) from file.
90 */
91 @Override
92 protected void initFromFile(final ByteSequence bytes, final boolean wide) throws IOException {
93 super.setLength(2);
94 b = bytes.readByte();
95 }
96
97 /**
98 * @return mnemonic for instruction
99 */
100 @Override
101 public String toString(final boolean verbose) {
102 return super.toString(verbose) + " " + b;
103 }
104 }