View Javadoc

    1   /*
    2    * Copyright  2000-2004 The Apache Software Foundation
    3    *
    4    *  Licensed under the Apache License, Version 2.0 (the "License");
    5    *  you may not use this file except in compliance with the License.
    6    *  You may obtain a copy of the License at
    7    *
    8    *      http://www.apache.org/licenses/LICENSE-2.0
    9    *
    10   *  Unless required by applicable law or agreed to in writing, software
    11   *  distributed under the License is distributed on an "AS IS" BASIS,
    12   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   *  See the License for the specific language governing permissions and
    14   *  limitations under the License.
    15   *
    16   */
    17  package org.apache.bcel.generic;
    18
    19  import org.apache.bcel.Constants;
    20
    21  /***
    22   * Super class for the family of arithmetic instructions.
    23   *
    24   * @version $Id: ArithmeticInstruction.java 386056 2006-03-15 11:31:56Z tcurdt $
    25   * @author  <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A>
    26   */
    27  public abstract class ArithmeticInstruction extends Instruction implements TypedInstruction,
    28          StackProducer, StackConsumer {
    29
    30      /***
    31       * Empty constructor needed for the Class.newInstance() statement in
    32       * Instruction.readInstruction(). Not to be used otherwise.
    33       */
    34      ArithmeticInstruction() {
    35      }
    36
    37
    38      /***
    39       * @param opcode of instruction
    40       */
    41      protected ArithmeticInstruction(short opcode) {
    42          super(opcode, (short) 1);
    43      }
    44
    45
    46      /*** @return type associated with the instruction
    47       */
    48      public Type getType( ConstantPoolGen cp ) {
    49          switch (opcode) {
    50              case Constants.DADD:
    51              case Constants.DDIV:
    52              case Constants.DMUL:
    53              case Constants.DNEG:
    54              case Constants.DREM:
    55              case Constants.DSUB:
    56                  return Type.DOUBLE;
    57              case Constants.FADD:
    58              case Constants.FDIV:
    59              case Constants.FMUL:
    60              case Constants.FNEG:
    61              case Constants.FREM:
    62              case Constants.FSUB:
    63                  return Type.FLOAT;
    64              case Constants.IADD:
    65              case Constants.IAND:
    66              case Constants.IDIV:
    67              case Constants.IMUL:
    68              case Constants.INEG:
    69              case Constants.IOR:
    70              case Constants.IREM:
    71              case Constants.ISHL:
    72              case Constants.ISHR:
    73              case Constants.ISUB:
    74              case Constants.IUSHR:
    75              case Constants.IXOR:
    76                  return Type.INT;
    77              case Constants.LADD:
    78              case Constants.LAND:
    79              case Constants.LDIV:
    80              case Constants.LMUL:
    81              case Constants.LNEG:
    82              case Constants.LOR:
    83              case Constants.LREM:
    84              case Constants.LSHL:
    85              case Constants.LSHR:
    86              case Constants.LSUB:
    87              case Constants.LUSHR:
    88              case Constants.LXOR:
    89                  return Type.LONG;
    90              default: // Never reached
    91                  throw new ClassGenException("Unknown type " + opcode);
    92          }
    93      }
    94  }