2 * ASM: a very small and fast Java bytecode manipulation framework
3 * Copyright (c) 2000-2005 INRIA, France Telecom
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
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.
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
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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
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30 package org.objectweb.asm.tree.analysis;
32 import org.objectweb.asm.Type;
35 * A {@link Value} that is represented by its type in a seven types type sytem.
36 * This type system distinguishes the UNINITIALZED, INT, FLOAT, LONG, DOUBLE,
37 * REFERENCE and RETURNADDRESS types.
39 * @author Eric Bruneton
41 public class BasicValue implements Value {
43 public final static Value UNINITIALIZED_VALUE = new BasicValue(null);
45 public final static Value INT_VALUE = new BasicValue(Type.INT_TYPE);
47 public final static Value FLOAT_VALUE = new BasicValue(Type.FLOAT_TYPE);
49 public final static Value LONG_VALUE = new BasicValue(Type.LONG_TYPE);
51 public final static Value DOUBLE_VALUE = new BasicValue(Type.DOUBLE_TYPE);
53 public final static Value REFERENCE_VALUE = new BasicValue(Type.getType("Ljava/lang/Object;"));
55 public final static Value RETURNADDRESS_VALUE = new BasicValue(null);
59 public BasicValue(final Type type) {
63 public Type getType() {
67 public int getSize() {
68 return type == Type.LONG_TYPE || type == Type.DOUBLE_TYPE ? 2 : 1;
71 public boolean isReference() {
73 && (type.getSort() == Type.OBJECT || type.getSort() == Type.ARRAY);
76 public boolean equals(final Object value) {
79 } else if (value instanceof BasicValue) {
81 return ((BasicValue) value).type == null;
83 return type.equals(((BasicValue) value).type);
90 public int hashCode() {
91 return type == null ? 0 : type.hashCode();
94 public String toString() {
95 if (this == UNINITIALIZED_VALUE) {
97 } else if (this == RETURNADDRESS_VALUE) {
99 } else if (this == REFERENCE_VALUE) {
102 return type.getDescriptor();