package org.apache.bcel.generic;

/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2001 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
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 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation" and
 *    "Apache BCEL" must not be used to endorse or promote products
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 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */
import org.apache.bcel.Constants;
/**
 * Super class for the family of arithmetic instructions.
 *
 * @version $Id: ArithmeticInstruction.java,v 1.1 2005/12/16 14:11:24 andos Exp $
 * @author  <A HREF="mailto:[email protected]">M. Dahm</A>
 */
public abstract class ArithmeticInstruction extends Instruction
  implements TypedInstruction, StackProducer, StackConsumer {
  /**
   * Empty constructor needed for the Class.newInstance() statement in
   * Instruction.readInstruction(). Not to be used otherwise.
   */
  ArithmeticInstruction() {}

  /**
   * @param opcode of instruction
   */
  protected ArithmeticInstruction(short opcode) {
    super(opcode, (short)1);
  }

  /** @return type associated with the instruction
   */
  public Type getType(ConstantPoolGen cp) {
    switch(opcode) {
    case Constants.DADD: case Constants.DDIV: case Constants.DMUL:
    case Constants.DNEG: case Constants.DREM: case Constants.DSUB:
      return Type.DOUBLE;

    case Constants.FADD: case Constants.FDIV: case Constants.FMUL:
    case Constants.FNEG: case Constants.FREM: case Constants.FSUB:
      return Type.FLOAT;

    case Constants.IADD: case Constants.IAND: case Constants.IDIV:
    case Constants.IMUL: case Constants.INEG: case Constants.IOR: case Constants.IREM:
    case Constants.ISHL: case Constants.ISHR: case Constants.ISUB:
    case Constants.IUSHR: case Constants.IXOR:
      return Type.INT;

    case Constants.LADD: case Constants.LAND: case Constants.LDIV:
    case Constants.LMUL: case Constants.LNEG: case Constants.LOR: case Constants.LREM:
    case Constants.LSHL: case Constants.LSHR: case Constants.LSUB:
    case Constants.LUSHR: case Constants.LXOR:
      return Type.LONG;

    default: // Never reached
      throw new ClassGenException("Unknown type " + opcode);
    }
  }
}