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 */ 026public class LDC2_W extends CPInstruction implements PushInstruction { 027 028 /** 029 * Empty constructor needed for Instruction.readInstruction. 030 * Not to be used otherwise. 031 */ 032 LDC2_W() { 033 } 034 035 036 public LDC2_W(final int index) { 037 super(org.apache.bcel.Const.LDC2_W, index); 038 } 039 040 041 @Override 042 public Type getType( final ConstantPoolGen cpg ) { 043 switch (cpg.getConstantPool().getConstant(super.getIndex()).getTag()) { 044 case org.apache.bcel.Const.CONSTANT_Long: 045 return Type.LONG; 046 case org.apache.bcel.Const.CONSTANT_Double: 047 return Type.DOUBLE; 048 default: // Never reached 049 throw new RuntimeException("Unknown constant type " + super.getOpcode()); 050 } 051 } 052 053 054 public Number getValue( final ConstantPoolGen cpg ) { 055 final org.apache.bcel.classfile.Constant c = cpg.getConstantPool().getConstant(super.getIndex()); 056 switch (c.getTag()) { 057 case org.apache.bcel.Const.CONSTANT_Long: 058 return Long.valueOf(((org.apache.bcel.classfile.ConstantLong) c).getBytes()); 059 case org.apache.bcel.Const.CONSTANT_Double: 060 return new Double(((org.apache.bcel.classfile.ConstantDouble) c).getBytes()); 061 default: // Never reached 062 throw new RuntimeException("Unknown or invalid constant type at " + super.getIndex()); 063 } 064 } 065 066 067 /** 068 * Call corresponding visitor method(s). The order is: 069 * Call visitor methods of implemented interfaces first, then 070 * call methods according to the class hierarchy in descending order, 071 * i.e., the most specific visitXXX() call comes last. 072 * 073 * @param v Visitor object 074 */ 075 @Override 076 public void accept( final Visitor v ) { 077 v.visitStackProducer(this); 078 v.visitPushInstruction(this); 079 v.visitTypedInstruction(this); 080 v.visitCPInstruction(this); 081 v.visitLDC2_W(this); 082 } 083}