1 /*
   2  * reserved comment block
   3  * DO NOT REMOVE OR ALTER!
   4  */
   5 /*
   6  * Licensed to the Apache Software Foundation (ASF) under one or more
   7  * contributor license agreements.  See the NOTICE file distributed with
   8  * this work for additional information regarding copyright ownership.
   9  * The ASF licenses this file to You under the Apache License, Version 2.0
  10  * (the "License"); you may not use this file except in compliance with
  11  * the License.  You may obtain a copy of the License at
  12  *
  13  *      http://www.apache.org/licenses/LICENSE-2.0
  14  *
  15  * Unless required by applicable law or agreed to in writing, software
  16  * distributed under the License is distributed on an "AS IS" BASIS,
  17  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  18  * See the License for the specific language governing permissions and
  19  * limitations under the License.
  20  */
  21 
  22 package com.sun.org.apache.bcel.internal.generic;
  23 
  24 import com.sun.org.apache.bcel.internal.Constants;
  25 import com.sun.org.apache.bcel.internal.ExceptionConstants;
  26 
  27 /**
  28  * Super class for the xRETURN family of instructions.
  29  *
  30  * @author  <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
  31  */
  32 public abstract class ReturnInstruction extends Instruction
  33   implements ExceptionThrower, TypedInstruction, StackConsumer {
  34   /**
  35    * Empty constructor needed for the Class.newInstance() statement in
  36    * Instruction.readInstruction(). Not to be used otherwise.
  37    */
  38   ReturnInstruction() {}
  39 
  40   /**
  41    * @param opcode of instruction
  42    */
  43   protected ReturnInstruction(short opcode) {
  44     super(opcode, (short)1);
  45   }
  46 
  47   public Type getType() {
  48     switch(opcode) {
  49       case Constants.IRETURN: return Type.INT;
  50       case Constants.LRETURN: return Type.LONG;
  51       case Constants.FRETURN: return Type.FLOAT;
  52       case Constants.DRETURN: return Type.DOUBLE;
  53       case Constants.ARETURN: return Type.OBJECT;
  54       case Constants.RETURN:  return Type.VOID;
  55 
  56     default: // Never reached
  57       throw new ClassGenException("Unknown type " + opcode);
  58     }
  59   }
  60 
  61   public Class[] getExceptions() {
  62     return new Class[] { ExceptionConstants.ILLEGAL_MONITOR_STATE };
  63   }
  64 
  65   /** @return type associated with the instruction
  66    */
  67   public Type getType(ConstantPoolGen cp) {
  68     return getType();
  69   }
  70 }