1. package com.sun.org.apache.bcel.internal.generic;
  2. /* ====================================================================
  3. * The Apache Software License, Version 1.1
  4. *
  5. * Copyright (c) 2001 The Apache Software Foundation. All rights
  6. * reserved.
  7. *
  8. * Redistribution and use in source and binary forms, with or without
  9. * modification, are permitted provided that the following conditions
  10. * are met:
  11. *
  12. * 1. Redistributions of source code must retain the above copyright
  13. * notice, this list of conditions and the following disclaimer.
  14. *
  15. * 2. Redistributions in binary form must reproduce the above copyright
  16. * notice, this list of conditions and the following disclaimer in
  17. * the documentation and/or other materials provided with the
  18. * distribution.
  19. *
  20. * 3. The end-user documentation included with the redistribution,
  21. * if any, must include the following acknowledgment:
  22. * "This product includes software developed by the
  23. * Apache Software Foundation (http://www.apache.org/)."
  24. * Alternately, this acknowledgment may appear in the software itself,
  25. * if and wherever such third-party acknowledgments normally appear.
  26. *
  27. * 4. The names "Apache" and "Apache Software Foundation" and
  28. * "Apache BCEL" must not be used to endorse or promote products
  29. * derived from this software without prior written permission. For
  30. * written permission, please contact apache@apache.org.
  31. *
  32. * 5. Products derived from this software may not be called "Apache",
  33. * "Apache BCEL", nor may "Apache" appear in their name, without
  34. * prior written permission of the Apache Software Foundation.
  35. *
  36. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
  37. * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  38. * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  39. * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
  40. * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  41. * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  42. * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  43. * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  44. * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  45. * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  46. * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  47. * SUCH DAMAGE.
  48. * ====================================================================
  49. *
  50. * This software consists of voluntary contributions made by many
  51. * individuals on behalf of the Apache Software Foundation. For more
  52. * information on the Apache Software Foundation, please see
  53. * <http://www.apache.org/>.
  54. */
  55. import com.sun.org.apache.bcel.internal.Constants;
  56. import com.sun.org.apache.bcel.internal.ExceptionConstants;
  57. /**
  58. * Super class for the xRETURN family of instructions.
  59. *
  60. * @version $Id: ReturnInstruction.java,v 1.1.1.1 2001/10/29 20:00:26 jvanzyl Exp $
  61. * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
  62. */
  63. public abstract class ReturnInstruction extends Instruction
  64. implements ExceptionThrower, TypedInstruction, StackConsumer {
  65. /**
  66. * Empty constructor needed for the Class.newInstance() statement in
  67. * Instruction.readInstruction(). Not to be used otherwise.
  68. */
  69. ReturnInstruction() {}
  70. /**
  71. * @param opcode of instruction
  72. */
  73. protected ReturnInstruction(short opcode) {
  74. super(opcode, (short)1);
  75. }
  76. public Type getType() {
  77. switch(opcode) {
  78. case Constants.IRETURN: return Type.INT;
  79. case Constants.LRETURN: return Type.LONG;
  80. case Constants.FRETURN: return Type.FLOAT;
  81. case Constants.DRETURN: return Type.DOUBLE;
  82. case Constants.ARETURN: return Type.OBJECT;
  83. case Constants.RETURN: return Type.VOID;
  84. default: // Never reached
  85. throw new ClassGenException("Unknown type " + opcode);
  86. }
  87. }
  88. public Class[] getExceptions() {
  89. return new Class[] { ExceptionConstants.ILLEGAL_MONITOR_STATE };
  90. }
  91. /** @return type associated with the instruction
  92. */
  93. public Type getType(ConstantPoolGen cp) {
  94. return getType();
  95. }
  96. }