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 020import org.apache.bcel.Const; 021 022/** 023 * Super class for the x2y family of instructions. 024 * 025 */ 026public abstract class ConversionInstruction extends Instruction implements TypedInstruction, 027 StackProducer, StackConsumer { 028 029 /** 030 * Empty constructor needed for Instruction.readInstruction. 031 * Not to be used otherwise. 032 */ 033 ConversionInstruction() { 034 } 035 036 037 /** 038 * @param opcode opcode of instruction 039 */ 040 protected ConversionInstruction(final short opcode) { 041 super(opcode, (short) 1); 042 } 043 044 045 /** @return type associated with the instruction 046 */ 047 @Override 048 public Type getType( final ConstantPoolGen cp ) { 049 final short _opcode = super.getOpcode(); 050 switch (_opcode) { 051 case Const.D2I: 052 case Const.F2I: 053 case Const.L2I: 054 return Type.INT; 055 case Const.D2F: 056 case Const.I2F: 057 case Const.L2F: 058 return Type.FLOAT; 059 case Const.D2L: 060 case Const.F2L: 061 case Const.I2L: 062 return Type.LONG; 063 case Const.F2D: 064 case Const.I2D: 065 case Const.L2D: 066 return Type.DOUBLE; 067 case Const.I2B: 068 return Type.BYTE; 069 case Const.I2C: 070 return Type.CHAR; 071 case Const.I2S: 072 return Type.SHORT; 073 default: // Never reached 074 throw new ClassGenException("Unknown type " + _opcode); 075 } 076 } 077}