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1   /*
2    * reserved comment block
3    * DO NOT REMOVE OR ALTER!
4    */
5   package com.sun.org.apache.bcel.internal.generic;
6   
7   /* ====================================================================
8    * The Apache Software License, Version 1.1
9    *
10   * Copyright (c) 2001 The Apache Software Foundation.  All rights
11   * reserved.
12   *
13   * Redistribution and use in source and binary forms, with or without
14   * modification, are permitted provided that the following conditions
15   * are met:
16   *
17   * 1. Redistributions of source code must retain the above copyright
18   *    notice, this list of conditions and the following disclaimer.
19   *
20   * 2. Redistributions in binary form must reproduce the above copyright
21   *    notice, this list of conditions and the following disclaimer in
22   *    the documentation and/or other materials provided with the
23   *    distribution.
24   *
25   * 3. The end-user documentation included with the redistribution,
26   *    if any, must include the following acknowledgment:
27   *       "This product includes software developed by the
28   *        Apache Software Foundation (http://www.apache.org/)."
29   *    Alternately, this acknowledgment may appear in the software itself,
30   *    if and wherever such third-party acknowledgments normally appear.
31   *
32   * 4. The names "Apache" and "Apache Software Foundation" and
33   *    "Apache BCEL" must not be used to endorse or promote products
34   *    derived from this software without prior written permission. For
35   *    written permission, please contact apache@apache.org.
36   *
37   * 5. Products derived from this software may not be called "Apache",
38   *    "Apache BCEL", nor may "Apache" appear in their name, without
39   *    prior written permission of the Apache Software Foundation.
40   *
41   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
42   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
43   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
44   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
45   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
46   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
47   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
48   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
49   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
50   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
51   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
52   * SUCH DAMAGE.
53   * ====================================================================
54   *
55   * This software consists of voluntary contributions made by many
56   * individuals on behalf of the Apache Software Foundation.  For more
57   * information on the Apache Software Foundation, please see
58   * <http://www.apache.org/>.
59   */
60  
61  /**
62   * LDC2_W - Push long or double from constant pool
63   *
64   * <PRE>Stack: ... -&gt; ..., item.word1, item.word2</PRE>
65   *
66   * @author  <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
67   */
68  public class LDC2_W extends CPInstruction
69    implements PushInstruction, TypedInstruction {
70    /**
71     * Empty constructor needed for the Class.newInstance() statement in
72     * Instruction.readInstruction(). Not to be used otherwise.
73     */
74    LDC2_W() {}
75  
76    public LDC2_W(int index) {
77      super(com.sun.org.apache.bcel.internal.Constants.LDC2_W, index);
78    }
79  
80    public Type getType(ConstantPoolGen cpg) {
81      switch(cpg.getConstantPool().getConstant(index).getTag()) {
82      case com.sun.org.apache.bcel.internal.Constants.CONSTANT_Long:   return Type.LONG;
83      case com.sun.org.apache.bcel.internal.Constants.CONSTANT_Double: return Type.DOUBLE;
84      default: // Never reached
85        throw new RuntimeException("Unknown constant type " + opcode);
86      }
87    }
88  
89    public Number getValue(ConstantPoolGen cpg) {
90      com.sun.org.apache.bcel.internal.classfile.Constant c = cpg.getConstantPool().getConstant(index);
91  
92      switch(c.getTag()) {
93      case com.sun.org.apache.bcel.internal.Constants.CONSTANT_Long:
94          return new Long(((com.sun.org.apache.bcel.internal.classfile.ConstantLong)c).getBytes());
95  
96      case com.sun.org.apache.bcel.internal.Constants.CONSTANT_Double:
97          return new Double(((com.sun.org.apache.bcel.internal.classfile.ConstantDouble)c).getBytes());
98  
99      default: // Never reached
100       throw new RuntimeException("Unknown or invalid constant type at " + index);
101       }
102   }
103 
104   /**
105    * Call corresponding visitor method(s). The order is:
106    * Call visitor methods of implemented interfaces first, then
107    * call methods according to the class hierarchy in descending order,
108    * i.e., the most specific visitXXX() call comes last.
109    *
110    * @param v Visitor object
111    */
112   public void accept(Visitor v) {
113     v.visitStackProducer(this);
114     v.visitPushInstruction(this);
115     v.visitTypedInstruction(this);
116     v.visitCPInstruction(this);
117     v.visitLDC2_W(this);
118   }
119 }