01: /***
02: * ASM: a very small and fast Java bytecode manipulation framework
03: * Copyright (c) 2000-2005 INRIA, France Telecom
04: * All rights reserved.
05: *
06: * Redistribution and use in source and binary forms, with or without
07: * modification, are permitted provided that the following conditions
08: * are met:
09: * 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: */package com.tc.asm.tree.analysis;
30:
31: import java.util.Set;
32:
33: import com.tc.asm.tree.AbstractInsnNode;
34:
35: /**
36: * A {@link Value} that is represented by its type in a two types type system.
37: * This type system distinguishes the ONEWORD and TWOWORDS types.
38: *
39: * @author Eric Bruneton
40: */
41: public class SourceValue implements Value {
42:
43: /**
44: * The size of this value.
45: */
46: public final int size;
47:
48: /**
49: * The instructions that can produce this value. For example, for the Java
50: * code below, the instructions that can produce the value of <tt>i</tt>
51: * at line 5 are the txo ISTORE instructions at line 1 and 3:
52: *
53: * <pre>
54: * 1: i = 0;
55: * 2: if (...) {
56: * 3: i = 1;
57: * 4: }
58: * 5: return i;
59: * </pre>
60: *
61: * This field is a set of {@link AbstractInsnNode} objects.
62: */
63: public final Set insns;
64:
65: public SourceValue(final int size) {
66: this (size, SmallSet.EMPTY_SET);
67: }
68:
69: public SourceValue(final int size, final AbstractInsnNode insn) {
70: this .size = size;
71: this .insns = new SmallSet(insn, null);
72: }
73:
74: public SourceValue(final int size, final Set insns) {
75: this .size = size;
76: this .insns = insns;
77: }
78:
79: public int getSize() {
80: return size;
81: }
82:
83: public boolean equals(final Object value) {
84: SourceValue v = (SourceValue) value;
85: return size == v.size && insns.equals(v.insns);
86: }
87:
88: public int hashCode() {
89: return insns.hashCode();
90: }
91: }
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