KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > oracle > toplink > libraries > asm > tree > analysis > DataflowValue


1 /***
2  * ASM: a very small and fast Java bytecode manipulation framework
3  * Copyright (c) 2000,2002,2003 INRIA, France Telecom
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  * notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  * notice, this list of conditions and the following disclaimer in the
13  * documentation and/or other materials provided with the distribution.
14  * 3. Neither the name of the copyright holders nor the names of its
15  * contributors may be used to endorse or promote products derived from
16  * this software without specific prior written permission.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
28  * THE POSSIBILITY OF SUCH DAMAGE.
29  */
30
31 package oracle.toplink.libraries.asm.tree.analysis;
32
33 import java.util.Collections JavaDoc;
34 import java.util.HashSet JavaDoc;
35 import java.util.Set JavaDoc;
36
37 import oracle.toplink.libraries.asm.tree.AbstractInsnNode;
38
39 /**
40  * A {@link Value} that is represented by its type in a two types type system.
41  * This type system distinguishes the ONEWORD and TWOWORDS types.
42  *
43  * @author Eric Bruneton
44  */
45
46 public class DataflowValue implements Value {
47
48   /**
49    * The size of this value.
50    */
51   
52   public final int size;
53   
54   /**
55    * The instructions that can produce this value. For example, for the Java
56    * code below, the instructions that can produce the value of <tt>i</tt>
57    * at line 5 are the txo ISTORE instructions at line 1 and 3:
58    * <pre>
59    * 1: i = 0;
60    * 2: if (...) {
61    * 3: i = 1;
62    * 4: }
63    * 5: return i;
64    * </pre>
65    * This field is a set of {@link AbstractInsnNode} objects.
66    */
67   
68   public final Set JavaDoc insns;
69   
70   public DataflowValue (final int size) {
71     this(size, Collections.EMPTY_SET);
72   }
73   
74   public DataflowValue (final int size, final AbstractInsnNode insn) {
75     this.size = size;
76     this.insns = new HashSet JavaDoc();
77     this.insns.add(insn);
78   }
79   
80   public DataflowValue (final int size, final Set JavaDoc insns) {
81     this.size = size;
82     this.insns = insns;
83   }
84   
85   public int getSize () {
86     return size;
87   }
88
89   public boolean equals (final Value value) {
90     DataflowValue v = (DataflowValue)value;
91     return size == v.size && insns.equals(v.insns);
92   }
93 }
94
Popular Tags