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 family of arithmetic instructions. 024 * 025 */ 026public abstract class ArithmeticInstruction extends Instruction implements TypedInstruction, StackProducer, StackConsumer { 027 028 /** 029 * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise. 030 */ 031 ArithmeticInstruction() { 032 } 033 034 /** 035 * @param opcode of instruction 036 */ 037 protected ArithmeticInstruction(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.DADD: 049 case Const.DDIV: 050 case Const.DMUL: 051 case Const.DNEG: 052 case Const.DREM: 053 case Const.DSUB: 054 return Type.DOUBLE; 055 case Const.FADD: 056 case Const.FDIV: 057 case Const.FMUL: 058 case Const.FNEG: 059 case Const.FREM: 060 case Const.FSUB: 061 return Type.FLOAT; 062 case Const.IADD: 063 case Const.IAND: 064 case Const.IDIV: 065 case Const.IMUL: 066 case Const.INEG: 067 case Const.IOR: 068 case Const.IREM: 069 case Const.ISHL: 070 case Const.ISHR: 071 case Const.ISUB: 072 case Const.IUSHR: 073 case Const.IXOR: 074 return Type.INT; 075 case Const.LADD: 076 case Const.LAND: 077 case Const.LDIV: 078 case Const.LMUL: 079 case Const.LNEG: 080 case Const.LOR: 081 case Const.LREM: 082 case Const.LSHL: 083 case Const.LSHR: 084 case Const.LSUB: 085 case Const.LUSHR: 086 case Const.LXOR: 087 return Type.LONG; 088 default: // Never reached 089 throw new ClassGenException("Unknown type " + opcode); 090 } 091 } 092}