1 package org.apache.bcel.generic;
2
3 /* ====================================================================
4 * The Apache Software License, Version 1.1
5 *
6 * Copyright (c) 2001 The Apache Software Foundation. All rights
7 * reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
19 * distribution.
20 *
21 * 3. The end-user documentation included with the redistribution,
22 * if any, must include the following acknowledgment:
23 * "This product includes software developed by the
24 * Apache Software Foundation (http://www.apache.org/)."
25 * Alternately, this acknowledgment may appear in the software itself,
26 * if and wherever such third-party acknowledgments normally appear.
27 *
28 * 4. The names "Apache" and "Apache Software Foundation" and
29 * "Apache BCEL" must not be used to endorse or promote products
30 * derived from this software without prior written permission. For
31 * written permission, please contact apache@apache.org.
32 *
33 * 5. Products derived from this software may not be called "Apache",
34 * "Apache BCEL", nor may "Apache" appear in their name, without
35 * prior written permission of the Apache Software Foundation.
36 *
37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
40 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
41 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
43 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
44 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
45 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
46 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
47 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48 * SUCH DAMAGE.
49 * ====================================================================
50 *
51 * This software consists of voluntary contributions made by many
52 * individuals on behalf of the Apache Software Foundation. For more
53 * information on the Apache Software Foundation, please see
54 * <http://www.apache.org/>.
55 */
56
57 /***
58 * LDC2_W - Push long or double from constant pool
59 *
60 * <PRE>Stack: ... -> ..., item.word1, item.word2</PRE>
61 *
62 * @version $Id: LDC2_W.java,v 1.1.1.1 2001/10/29 20:00:21 jvanzyl Exp $
63 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
64 */
65 public class LDC2_W extends CPInstruction
66 implements PushInstruction, TypedInstruction {
67 /***
68 * Empty constructor needed for the Class.newInstance() statement in
69 * Instruction.readInstruction(). Not to be used otherwise.
70 */
71 LDC2_W() {}
72
73 public LDC2_W(int index) {
74 super(org.apache.bcel.Constants.LDC2_W, index);
75 }
76
77 public Type getType(ConstantPoolGen cpg) {
78 switch(cpg.getConstantPool().getConstant(index).getTag()) {
79 case org.apache.bcel.Constants.CONSTANT_Long: return Type.LONG;
80 case org.apache.bcel.Constants.CONSTANT_Double: return Type.DOUBLE;
81 default: // Never reached
82 throw new RuntimeException("Unknown constant type " + opcode);
83 }
84 }
85
86 public Number getValue(ConstantPoolGen cpg) {
87 org.apache.bcel.classfile.Constant c = cpg.getConstantPool().getConstant(index);
88
89 switch(c.getTag()) {
90 case org.apache.bcel.Constants.CONSTANT_Long:
91 return new Long(((org.apache.bcel.classfile.ConstantLong)c).getBytes());
92
93 case org.apache.bcel.Constants.CONSTANT_Double:
94 return new Double(((org.apache.bcel.classfile.ConstantDouble)c).getBytes());
95
96 default: // Never reached
97 throw new RuntimeException("Unknown or invalid constant type at " + index);
98 }
99 }
100
101 /***
102 * Call corresponding visitor method(s). The order is:
103 * Call visitor methods of implemented interfaces first, then
104 * call methods according to the class hierarchy in descending order,
105 * i.e., the most specific visitXXX() call comes last.
106 *
107 * @param v Visitor object
108 */
109 public void accept(Visitor v) {
110 v.visitStackProducer(this);
111 v.visitPushInstruction(this);
112 v.visitTypedInstruction(this);
113 v.visitCPInstruction(this);
114 v.visitLDC2_W(this);
115 }
116 }
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