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(Type.DOUBLE_TYPE); 81 82 public static final BasicValue REFERENCE_VALUE = new BasicValue(Type.getObjectType("java/lang/Object")); 83 84 public static final BasicValue RETURNADDRESS_VALUE = new BasicValue(Type.VOID_TYPE); 85 86 private final Type type; 87 88 public BasicValue(final Type type) { 89 this.type = type; 90 } 91 92 public Type getType() { 93 return type; 94 } 95 96 public int getSize() { 97 return type == Type.LONG_TYPE || type == Type.DOUBLE_TYPE ? 2 : 1; 98 } 99 100 public boolean isReference() { 101 return type != null 102 && (type.getSort() == Type.OBJECT || type.getSort() == Type.ARRAY); 103 } 104 105 @Override 106 public boolean equals(final Object value) { 107 if (value == this) { 108 return true; 109 } else if (value instanceof BasicValue) { 110 if (type == null) { 111 return ((BasicValue) value).type == null; 112 } else { 113 return type.equals(((BasicValue) value).type); 114 } 115 } else { 116 return false; 117 } 118 } 119 120 @Override 121 public int hashCode() { 122 return type == null ? 0 : type.hashCode(); 123 } 124 125 @Override 126 public String toString() { 127 if (this == UNINITIALIZED_VALUE) { 128 return "."; 129 } else if (this == RETURNADDRESS_VALUE) { 130 return "A"; 131 } else if (this == REFERENCE_VALUE) { 132 return "R"; 133 } else { 134 return type.getDescriptor(); 135 } 136 } 137 }