SourceValue.java revision 674060f01e9090cd21b3c5656cc3204912ad17a6 
1/***
2 * ASM: a very small and fast Java bytecode manipulation framework
3 * Copyright (c) 2000-2007 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 */
30package org.mockito.asm.tree.analysis;
31
32import java.util.Set;
33
34import org.mockito.asm.tree.AbstractInsnNode;
35
36/**
37 * A {@link Value} that is represented by its type in a two types type system.
38 * This type system distinguishes the ONEWORD and TWOWORDS types.
39 *
40 * @author Eric Bruneton
41 */
42public class SourceValue implements Value {
43
44    /**
45     * The size of this value.
46     */
47    public final int size;
48
49    /**
50     * The instructions that can produce this value. For example, for the Java
51     * code below, the instructions that can produce the value of <tt>i</tt>
52     * at line 5 are the txo ISTORE instructions at line 1 and 3:
53     *
54     * <pre>
55     * 1: i = 0;
56     * 2: if (...) {
57     * 3:   i = 1;
58     * 4: }
59     * 5: return i;
60     * </pre>
61     *
62     * This field is a set of {@link AbstractInsnNode} objects.
63     */
64    public final Set insns;
65
66    public SourceValue(final int size) {
67        this(size, SmallSet.EMPTY_SET);
68    }
69
70    public SourceValue(final int size, final AbstractInsnNode insn) {
71        this.size = size;
72        this.insns = new SmallSet(insn, null);
73    }
74
75    public SourceValue(final int size, final Set insns) {
76        this.size = size;
77        this.insns = insns;
78    }
79
80    public int getSize() {
81        return size;
82    }
83
84    public boolean equals(final Object value) {
85        if (!(value instanceof SourceValue)) {
86        	return false;
87        }
88        SourceValue v = (SourceValue) value;
89        return size == v.size && insns.equals(v.insns);
90    }
91
92    public int hashCode() {
93        return insns.hashCode();
94    }
95}
96