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    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 x2y family of instructions.
    23   *
    24   * @version $Id: ConversionInstruction.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 ConversionInstruction 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      ConversionInstruction() {
    35      }
    36
    37
    38      /***
    39       * @param opcode opcode of instruction
    40       */
    41      protected ConversionInstruction(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.D2I:
    51              case Constants.F2I:
    52              case Constants.L2I:
    53                  return Type.INT;
    54              case Constants.D2F:
    55              case Constants.I2F:
    56              case Constants.L2F:
    57                  return Type.FLOAT;
    58              case Constants.D2L:
    59              case Constants.F2L:
    60              case Constants.I2L:
    61                  return Type.LONG;
    62              case Constants.F2D:
    63              case Constants.I2D:
    64              case Constants.L2D:
    65                  return Type.DOUBLE;
    66              case Constants.I2B:
    67                  return Type.BYTE;
    68              case Constants.I2C:
    69                  return Type.CHAR;
    70              case Constants.I2S:
    71                  return Type.SHORT;
    72              default: // Never reached
    73                  throw new ClassGenException("Unknown type " + opcode);
    74          }
    75      }
    76  }