001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 * 017 */ 018package org.apache.bcel.generic; 019 020/** 021 * LDC2_W - Push long or double from constant pool 022 * 023 * <PRE>Stack: ... -> ..., item.word1, item.word2</PRE> 024 * 025 * @version $Id: LDC2_W.java 1812166 2017-10-13 23:48:11Z ggregory $ 026 */ 027public class LDC2_W extends CPInstruction implements PushInstruction { 028 029 /** 030 * Empty constructor needed for Instruction.readInstruction. 031 * Not to be used otherwise. 032 */ 033 LDC2_W() { 034 } 035 036 037 public LDC2_W(final int index) { 038 super(org.apache.bcel.Const.LDC2_W, index); 039 } 040 041 042 @Override 043 public Type getType( final ConstantPoolGen cpg ) { 044 switch (cpg.getConstantPool().getConstant(super.getIndex()).getTag()) { 045 case org.apache.bcel.Const.CONSTANT_Long: 046 return Type.LONG; 047 case org.apache.bcel.Const.CONSTANT_Double: 048 return Type.DOUBLE; 049 default: // Never reached 050 throw new RuntimeException("Unknown constant type " + super.getOpcode()); 051 } 052 } 053 054 055 public Number getValue( final ConstantPoolGen cpg ) { 056 final org.apache.bcel.classfile.Constant c = cpg.getConstantPool().getConstant(super.getIndex()); 057 switch (c.getTag()) { 058 case org.apache.bcel.Const.CONSTANT_Long: 059 return Long.valueOf(((org.apache.bcel.classfile.ConstantLong) c).getBytes()); 060 case org.apache.bcel.Const.CONSTANT_Double: 061 return new Double(((org.apache.bcel.classfile.ConstantDouble) c).getBytes()); 062 default: // Never reached 063 throw new RuntimeException("Unknown or invalid constant type at " + super.getIndex()); 064 } 065 } 066 067 068 /** 069 * Call corresponding visitor method(s). The order is: 070 * Call visitor methods of implemented interfaces first, then 071 * call methods according to the class hierarchy in descending order, 072 * i.e., the most specific visitXXX() call comes last. 073 * 074 * @param v Visitor object 075 */ 076 @Override 077 public void accept( final Visitor v ) { 078 v.visitStackProducer(this); 079 v.visitPushInstruction(this); 080 v.visitTypedInstruction(this); 081 v.visitCPInstruction(this); 082 v.visitLDC2_W(this); 083 } 084}