1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.bcel.generic;
18
19 /**
20 * LDC2_W - Push long or double from constant pool
21 *
22 * <PRE>
23 * Stack: ... -> ..., item.word1, item.word2
24 * </PRE>
25 */
26 public class LDC2_W extends CPInstruction implements PushInstruction {
27
28 /**
29 * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.
30 */
31 LDC2_W() {
32 }
33
34 public LDC2_W(final int index) {
35 super(org.apache.bcel.Const.LDC2_W, index);
36 }
37
38 /**
39 * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call
40 * methods according to the class hierarchy in descending order, i.e., the most specific visitXXX() call comes last.
41 *
42 * @param v Visitor object
43 */
44 @Override
45 public void accept(final Visitor v) {
46 v.visitStackProducer(this);
47 v.visitPushInstruction(this);
48 v.visitTypedInstruction(this);
49 v.visitCPInstruction(this);
50 v.visitLDC2_W(this);
51 }
52
53 @Override
54 public Type getType(final ConstantPoolGen cpg) {
55 switch (cpg.getConstantPool().getConstant(super.getIndex()).getTag()) {
56 case org.apache.bcel.Const.CONSTANT_Long:
57 return Type.LONG;
58 case org.apache.bcel.Const.CONSTANT_Double:
59 return Type.DOUBLE;
60 default: // Never reached
61 throw new IllegalArgumentException("Unknown constant type " + super.getOpcode());
62 }
63 }
64
65 public Number getValue(final ConstantPoolGen cpg) {
66 final org.apache.bcel.classfile.Constant c = cpg.getConstantPool().getConstant(super.getIndex());
67 switch (c.getTag()) {
68 case org.apache.bcel.Const.CONSTANT_Long:
69 return Long.valueOf(((org.apache.bcel.classfile.ConstantLong) c).getBytes());
70 case org.apache.bcel.Const.CONSTANT_Double:
71 return Double.valueOf(((org.apache.bcel.classfile.ConstantDouble) c).getBytes());
72 default: // Never reached
73 throw new IllegalArgumentException("Unknown or invalid constant type at " + super.getIndex());
74 }
75 }
76 }