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> 024 * Stack: ... -> ..., item.word1, item.word2 025 * </PRE> 026 * 027 */ 028public class LDC2_W extends CPInstruction implements PushInstruction { 029 030 /** 031 * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise. 032 */ 033 LDC2_W() { 034 } 035 036 public LDC2_W(final int index) { 037 super(org.apache.bcel.Const.LDC2_W, index); 038 } 039 040 /** 041 * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call 042 * methods according to the class hierarchy in descending order, i.e., the most specific visitXXX() call comes last. 043 * 044 * @param v Visitor object 045 */ 046 @Override 047 public void accept(final Visitor v) { 048 v.visitStackProducer(this); 049 v.visitPushInstruction(this); 050 v.visitTypedInstruction(this); 051 v.visitCPInstruction(this); 052 v.visitLDC2_W(this); 053 } 054 055 @Override 056 public Type getType(final ConstantPoolGen cpg) { 057 switch (cpg.getConstantPool().getConstant(super.getIndex()).getTag()) { 058 case org.apache.bcel.Const.CONSTANT_Long: 059 return Type.LONG; 060 case org.apache.bcel.Const.CONSTANT_Double: 061 return Type.DOUBLE; 062 default: // Never reached 063 throw new IllegalArgumentException("Unknown constant type " + super.getOpcode()); 064 } 065 } 066 067 public Number getValue(final ConstantPoolGen cpg) { 068 final org.apache.bcel.classfile.Constant c = cpg.getConstantPool().getConstant(super.getIndex()); 069 switch (c.getTag()) { 070 case org.apache.bcel.Const.CONSTANT_Long: 071 return Long.valueOf(((org.apache.bcel.classfile.ConstantLong) c).getBytes()); 072 case org.apache.bcel.Const.CONSTANT_Double: 073 return Double.valueOf(((org.apache.bcel.classfile.ConstantDouble) c).getBytes()); 074 default: // Never reached 075 throw new IllegalArgumentException("Unknown or invalid constant type at " + super.getIndex()); 076 } 077 } 078}