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.IOException;
22
23 import org.apache.bcel.util.ByteSequence;
24
25 /**
26 * LDC_W - Push item from constant pool (wide index)
27 *
28 * <pre>
29 * Stack: ... -> ..., item.word1, item.word2
30 * </pre>
31 */
32 public class LDC_W extends LDC {
33
34 /**
35 * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.
36 */
37 LDC_W() {
38 }
39
40 /**
41 * Constructs an LDC_W instruction.
42 *
43 * @param index index into constant pool.
44 */
45 public LDC_W(final int index) {
46 super(index);
47 }
48
49 /**
50 * Reads needed data (that is, index) from file.
51 */
52 @Override
53 protected void initFromFile(final ByteSequence bytes, final boolean wide) throws IOException {
54 setIndex(bytes.readUnsignedShort());
55 // Override just in case it has been changed
56 super.setOpcode(org.apache.bcel.Const.LDC_W);
57 super.setLength(3);
58 }
59 }