1 /*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
3 *
4 * This code is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 only, as
6 * published by the Free Software Foundation. Oracle designates this
7 * particular file as subject to the "Classpath" exception as provided
8 * by Oracle in the LICENSE file that accompanied this code.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 */
24
25 /*
26 * This file is available under and governed by the GNU General Public
27 * License version 2 only, as published by the Free Software Foundation.
28 * However, the following notice accompanied the original version of this
29 * file:
30 *
31 * ASM: a very small and fast Java bytecode manipulation framework
32 * Copyright (c) 2000-2011 INRIA, France Telecom
33 * All rights reserved.
34 *
35 * Redistribution and use in source and binary forms, with or without
36 * modification, are permitted provided that the following conditions
37 * are met:
38 * 1. Redistributions of source code must retain the above copyright
39 * notice, this list of conditions and the following disclaimer.
40 * 2. Redistributions in binary form must reproduce the above copyright
41 * notice, this list of conditions and the following disclaimer in the
42 * documentation and/or other materials provided with the distribution.
43 * 3. Neither the name of the copyright holders nor the names of its
44 * contributors may be used to endorse or promote products derived from
45 * this software without specific prior written permission.
46 *
47 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
48 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
49 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
50 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
51 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
52 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
53 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
54 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
55 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
56 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
57 * THE POSSIBILITY OF SUCH DAMAGE.
58 */
59 package jdk.internal.org.objectweb.asm.tree.analysis;
60
61 import jdk.internal.org.objectweb.asm.Type;
62
63 /**
64 * A {@link Value} that is represented by its type in a seven types type system.
65 * This type system distinguishes the UNINITIALZED, INT, FLOAT, LONG, DOUBLE,
66 * REFERENCE and RETURNADDRESS types.
67 *
68 * @author Eric Bruneton
69 */
70 public class BasicValue implements Value {
71
72 public static final BasicValue UNINITIALIZED_VALUE = new BasicValue(null);
73
74 public static final BasicValue INT_VALUE = new BasicValue(Type.INT_TYPE);
75
76 public static final BasicValue FLOAT_VALUE = new BasicValue(Type.FLOAT_TYPE);
77
78 public static final BasicValue LONG_VALUE = new BasicValue(Type.LONG_TYPE);
79
80 public static final BasicValue DOUBLE_VALUE = new BasicValue(
81 Type.DOUBLE_TYPE);
82
83 public static final BasicValue REFERENCE_VALUE = new BasicValue(
84 Type.getObjectType("java/lang/Object"));
85
86 public static final BasicValue RETURNADDRESS_VALUE = new BasicValue(
87 Type.VOID_TYPE);
88
89 private final Type type;
90
91 public BasicValue(final Type type) {
92 this.type = type;
93 }
94
95 public Type getType() {
96 return type;
97 }
98
99 public int getSize() {
100 return type == Type.LONG_TYPE || type == Type.DOUBLE_TYPE ? 2 : 1;
101 }
102
103 public boolean isReference() {
104 return type != null
105 && (type.getSort() == Type.OBJECT || type.getSort() == Type.ARRAY);
106 }
107
108 @Override
109 public boolean equals(final Object value) {
110 if (value == this) {
111 return true;
112 } else if (value instanceof BasicValue) {
113 if (type == null) {
114 return ((BasicValue) value).type == null;
115 } else {
116 return type.equals(((BasicValue) value).type);
117 }
118 } else {
119 return false;
120 }
121 }
122
123 @Override
124 public int hashCode() {
125 return type == null ? 0 : type.hashCode();
126 }
127
128 @Override
129 public String toString() {
130 if (this == UNINITIALIZED_VALUE) {
131 return ".";
132 } else if (this == RETURNADDRESS_VALUE) {
133 return "A";
134 } else if (this == REFERENCE_VALUE) {
135 return "R";
136 } else {
137 return type.getDescriptor();
138 }
139 }
140 }