1 /* 2 * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved. 3 */ 4 /* 5 * Licensed to the Apache Software Foundation (ASF) under one or more 6 * contributor license agreements. See the NOTICE file distributed with 7 * this work for additional information regarding copyright ownership. 8 * The ASF licenses this file to You under the Apache License, Version 2.0 9 * (the "License"); you may not use this file except in compliance with 10 * the License. You may obtain a copy of the License at 11 * 12 * http://www.apache.org/licenses/LICENSE-2.0 13 * 14 * Unless required by applicable law or agreed to in writing, software 15 * distributed under the License is distributed on an "AS IS" BASIS, 16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 17 * See the License for the specific language governing permissions and 18 * limitations under the License. 19 */ 20 21 package com.sun.org.apache.bcel.internal.generic; 22 23 /** 24 * LDC2_W - Push long or double from constant pool 25 * 26 * <PRE>Stack: ... -> ..., item.word1, item.word2</PRE> 27 * 28 * @version $Id: LDC2_W.java 1749603 2016-06-21 20:50:19Z ggregory $ 29 * @LastModified: Nov 2017 30 */ 31 public class LDC2_W extends CPInstruction implements PushInstruction { 32 33 /** 34 * Empty constructor needed for the Class.newInstance() statement in 35 * Instruction.readInstruction(). Not to be used otherwise. 36 */ 37 LDC2_W() { 38 } 39 40 41 public LDC2_W(final int index) { 42 super(com.sun.org.apache.bcel.internal.Const.LDC2_W, index); 43 } 44 45 46 @Override 47 public Type getType( final ConstantPoolGen cpg ) { 48 switch (cpg.getConstantPool().getConstant(super.getIndex()).getTag()) { 49 case com.sun.org.apache.bcel.internal.Const.CONSTANT_Long: 50 return Type.LONG; 51 case com.sun.org.apache.bcel.internal.Const.CONSTANT_Double: 52 return Type.DOUBLE; 53 default: // Never reached 54 throw new RuntimeException("Unknown constant type " + super.getOpcode()); 55 } 56 } 57 58 59 public Number getValue( final ConstantPoolGen cpg ) { 60 final com.sun.org.apache.bcel.internal.classfile.Constant c = cpg.getConstantPool().getConstant(super.getIndex()); 61 switch (c.getTag()) { 62 case com.sun.org.apache.bcel.internal.Const.CONSTANT_Long: 63 return ((com.sun.org.apache.bcel.internal.classfile.ConstantLong) c).getBytes(); 64 case com.sun.org.apache.bcel.internal.Const.CONSTANT_Double: 65 return ((com.sun.org.apache.bcel.internal.classfile.ConstantDouble) c).getBytes(); 66 default: // Never reached 67 throw new RuntimeException("Unknown or invalid constant type at " + super.getIndex()); 68 } 69 } 70 71 72 /** 73 * Call corresponding visitor method(s). The order is: 74 * Call visitor methods of implemented interfaces first, then 75 * call methods according to the class hierarchy in descending order, 76 * i.e., the most specific visitXXX() call comes last. 77 * 78 * @param v Visitor object 79 */ 80 @Override 81 public void accept( final Visitor v ) { 82 v.visitStackProducer(this); 83 v.visitPushInstruction(this); 84 v.visitTypedInstruction(this); 85 v.visitCPInstruction(this); 86 v.visitLDC2_W(this); 87 } 88 }