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