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 /** 25 * LDC2_W - Push long or double from constant pool 26 * 27 * <PRE>Stack: ... -> ..., item.word1, item.word2</PRE> 28 * 29 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A> 30 */ 31 public class LDC2_W extends CPInstruction 32 implements PushInstruction, TypedInstruction { 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 public LDC2_W(int index) { 40 super(com.sun.org.apache.bcel.internal.Constants.LDC2_W, index); 41 } 42 43 public Type getType(ConstantPoolGen cpg) { 44 switch(cpg.getConstantPool().getConstant(index).getTag()) { 45 case com.sun.org.apache.bcel.internal.Constants.CONSTANT_Long: return Type.LONG; 46 case com.sun.org.apache.bcel.internal.Constants.CONSTANT_Double: return Type.DOUBLE; 47 default: // Never reached 48 throw new RuntimeException("Unknown constant type " + opcode); 49 } 50 } 51 52 public Number getValue(ConstantPoolGen cpg) { 53 com.sun.org.apache.bcel.internal.classfile.Constant c = cpg.getConstantPool().getConstant(index); 54 55 switch(c.getTag()) { 56 case com.sun.org.apache.bcel.internal.Constants.CONSTANT_Long: 57 return Long.valueOf(((com.sun.org.apache.bcel.internal.classfile.ConstantLong)c).getBytes()); 58 59 case com.sun.org.apache.bcel.internal.Constants.CONSTANT_Double: 60 return Double.valueOf(((com.sun.org.apache.bcel.internal.classfile.ConstantDouble)c).getBytes()); 61 62 default: // Never reached 63 throw new RuntimeException("Unknown or invalid constant type at " + index); 64 } 65 } 66 67 /** 68 * Call corresponding visitor method(s). The order is: 69 * Call visitor methods of implemented interfaces first, then 70 * call methods according to the class hierarchy in descending order, 71 * i.e., the most specific visitXXX() call comes last. 72 * 73 * @param v Visitor object 74 */ 75 public void accept(Visitor v) { 76 v.visitStackProducer(this); 77 v.visitPushInstruction(this); 78 v.visitTypedInstruction(this); 79 v.visitCPInstruction(this); 80 v.visitLDC2_W(this); 81 } 82 }