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 /**
22 * LDC2_W - Push long or double from constant pool
23 *
24 * <pre>
25 * Stack: ... -> ..., item.word1, item.word2
26 * </pre>
27 */
28 public class LDC2_W extends CPInstruction implements PushInstruction {
29
30 /**
31 * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.
32 */
33 LDC2_W() {
34 }
35
36 /**
37 * Constructs an LDC2_W instruction.
38 *
39 * @param index index into constant pool.
40 */
41 public LDC2_W(final int index) {
42 super(org.apache.bcel.Const.LDC2_W, index);
43 }
44
45 /**
46 * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call
47 * methods according to the class hierarchy in descending order, that is, the most specific visitXXX() call comes last.
48 *
49 * @param v Visitor object.
50 */
51 @Override
52 public void accept(final Visitor v) {
53 v.visitStackProducer(this);
54 v.visitPushInstruction(this);
55 v.visitTypedInstruction(this);
56 v.visitCPInstruction(this);
57 v.visitLDC2_W(this);
58 }
59
60 @Override
61 public Type getType(final ConstantPoolGen cpg) {
62 switch (cpg.getConstantPool().getConstant(super.getIndex()).getTag()) {
63 case org.apache.bcel.Const.CONSTANT_Long:
64 return Type.LONG;
65 case org.apache.bcel.Const.CONSTANT_Double:
66 return Type.DOUBLE;
67 default: // Never reached
68 throw new IllegalArgumentException("Unknown constant type " + super.getOpcode());
69 }
70 }
71
72 /**
73 * Gets the constant value from the constant pool.
74 *
75 * @param cpg constant pool generator.
76 * @return The constant value as a Number.
77 */
78 public Number getValue(final ConstantPoolGen cpg) {
79 final org.apache.bcel.classfile.Constant c = cpg.getConstantPool().getConstant(super.getIndex());
80 switch (c.getTag()) {
81 case org.apache.bcel.Const.CONSTANT_Long:
82 return Long.valueOf(((org.apache.bcel.classfile.ConstantLong) c).getBytes());
83 case org.apache.bcel.Const.CONSTANT_Double:
84 return Double.valueOf(((org.apache.bcel.classfile.ConstantDouble) c).getBytes());
85 default: // Never reached
86 throw new IllegalArgumentException("Unknown or invalid constant type at " + super.getIndex());
87 }
88 }
89 }