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| 1 | /* | ||
| 2 | * Copyright (c) 2008, 2011, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package sun.invoke.anon; | ||
| 27 | |||
| 28 | /** | ||
| 29 | * A visitor called by {@link ConstantPoolParser#parse(ConstantPoolVisitor)} | ||
| 30 | * when a constant pool entry is parsed. | ||
| 31 | * <p> | ||
| 32 | * A visit* method is called when a constant pool entry is parsed. | ||
| 33 | * The first argument is always the constant pool index. | ||
| 34 | * The second argument is always the constant pool tag, | ||
| 35 | * even for methods like {@link #visitUTF8(int, byte, String)} which only apply to one tag. | ||
| 36 | * String arguments refer to Utf8 or NameAndType entries declared elsewhere, | ||
| 37 | * and are always accompanied by the indexes of those entries. | ||
| 38 | * <p> | ||
| 39 | * The order of the calls to the visit* methods is not necessarily related | ||
| 40 | * to the order of the entries in the constant pool. | ||
| 41 | * If one entry has a reference to another entry, the latter (lower-level) | ||
| 42 | * entry will be visited first. | ||
| 43 | * <p> | ||
| 44 | * The following table shows the relation between constant pool entry | ||
| 45 | * types and the corresponding visit* methods: | ||
| 46 | * | ||
| 47 | * <table border=1 cellpadding=5 summary="constant pool visitor methods"> | ||
| 48 | * <tr><th>Tag(s)</th><th>Method</th></tr> | ||
| 49 | * <tr> | ||
| 50 | * <td>{@link #CONSTANT_Utf8}</td> | ||
| 51 | * <td>{@link #visitUTF8(int, byte, String)}</td> | ||
| 52 | * </tr><tr> | ||
| 53 | * <td>{@link #CONSTANT_Integer}, {@link #CONSTANT_Float}, | ||
| 54 | * {@link #CONSTANT_Long}, {@link #CONSTANT_Double}</td> | ||
| 55 | * <td>{@link #visitConstantValue(int, byte, Object)}</td> | ||
| 56 | * </tr><tr> | ||
| 57 | * <td>{@link #CONSTANT_String}, {@link #CONSTANT_Class}</td> | ||
| 58 | * <td>{@link #visitConstantString(int, byte, String, int)}</td> | ||
| 59 | * </tr><tr> | ||
| 60 | * <td>{@link #CONSTANT_NameAndType}</td> | ||
| 61 | * <td>{@link #visitDescriptor(int, byte, String, String, int, int)}</td> | ||
| 62 | * </tr><tr> | ||
| 63 | * <td>{@link #CONSTANT_Fieldref}, | ||
| 64 | * {@link #CONSTANT_Methodref}, | ||
| 65 | * {@link #CONSTANT_InterfaceMethodref}</td> | ||
| 66 | * <td>{@link #visitMemberRef(int, byte, String, String, String, int, int)}</td> | ||
| 67 | * </tr> | ||
| 68 | * </table> | ||
| 69 | * | ||
| 70 | * @see ConstantPoolPatch | ||
| 71 | * @author Remi Forax | ||
| 72 | * @author jrose | ||
| 73 | */ | ||
| 74 | public class ConstantPoolVisitor { | ||
| 75 | /** Called each time an UTF8 constant pool entry is found. | ||
| 76 | * @param index the constant pool index | ||
| 77 | * @param tag always {@link #CONSTANT_Utf8} | ||
| 78 | * @param utf8 string encoded in modified UTF-8 format passed as a {@code String} | ||
| 79 | * | ||
| 80 | * @see ConstantPoolPatch#putUTF8(int, String) | ||
| 81 | */ | ||
| 82 | public void visitUTF8(int index, byte tag, String utf8) { | ||
| 83 | // do nothing | ||
| 84 | } | ||
| 85 | |||
| 86 | /** Called for each constant pool entry that encodes an integer, | ||
| 87 | * a float, a long, or a double. | ||
| 88 | * Constant strings and classes are not managed by this method but | ||
| 89 | * by {@link #visitConstantString(int, byte, String, int)}. | ||
| 90 | * | ||
| 91 | * @param index the constant pool index | ||
| 92 | * @param tag one of {@link #CONSTANT_Integer}, | ||
| 93 | * {@link #CONSTANT_Float}, | ||
| 94 | * {@link #CONSTANT_Long}, | ||
| 95 | * or {@link #CONSTANT_Double} | ||
| 96 | * @param value encoded value | ||
| 97 | * | ||
| 98 | * @see ConstantPoolPatch#putConstantValue(int, Object) | ||
| 99 | */ | ||
| 100 | public void visitConstantValue(int index, byte tag, Object value) { | ||
| 101 | // do nothing | ||
| 102 | } | ||
| 103 | |||
| 104 | /** Called for each constant pool entry that encodes a string or a class. | ||
| 105 | * @param index the constant pool index | ||
| 106 | * @param tag one of {@link #CONSTANT_String}, | ||
| 107 | * {@link #CONSTANT_Class}, | ||
| 108 | * @param name string body or class name (using dot separator) | ||
| 109 | * @param nameIndex the index of the Utf8 string for the name | ||
| 110 | * | ||
| 111 | * @see ConstantPoolPatch#putConstantValue(int, byte, Object) | ||
| 112 | */ | ||
| 113 | public void visitConstantString(int index, byte tag, | ||
| 114 | String name, int nameIndex) { | ||
| 115 | // do nothing | ||
| 116 | } | ||
| 117 | |||
| 118 | /** Called for each constant pool entry that encodes a name and type. | ||
| 119 | * @param index the constant pool index | ||
| 120 | * @param tag always {@link #CONSTANT_NameAndType} | ||
| 121 | * @param memberName a field or method name | ||
| 122 | * @param signature the member signature | ||
| 123 | * @param memberNameIndex index of the Utf8 string for the member name | ||
| 124 | * @param signatureIndex index of the Utf8 string for the signature | ||
| 125 | * | ||
| 126 | * @see ConstantPoolPatch#putDescriptor(int, String, String) | ||
| 127 | */ | ||
| 128 | public void visitDescriptor(int index, byte tag, | ||
| 129 | String memberName, String signature, | ||
| 130 | int memberNameIndex, int signatureIndex) { | ||
| 131 | // do nothing | ||
| 132 | } | ||
| 133 | |||
| 134 | /** Called for each constant pool entry that encodes a field or method. | ||
| 135 | * @param index the constant pool index | ||
| 136 | * @param tag one of {@link #CONSTANT_Fieldref}, | ||
| 137 | * or {@link #CONSTANT_Methodref}, | ||
| 138 | * or {@link #CONSTANT_InterfaceMethodref} | ||
| 139 | * @param className the class name (using dot separator) | ||
| 140 | * @param memberName name of the field or method | ||
| 141 | * @param signature the field or method signature | ||
| 142 | * @param classNameIndex index of the Utf8 string for the class name | ||
| 143 | * @param descriptorIndex index of the NameAndType descriptor constant | ||
| 144 | * | ||
| 145 | * @see ConstantPoolPatch#putMemberRef(int, byte, String, String, String) | ||
| 146 | */ | ||
| 147 | public void visitMemberRef(int index, byte tag, | ||
| 148 | String className, String memberName, String signature, | ||
| 149 | int classNameIndex, int descriptorIndex) { | ||
| 150 | // do nothing | ||
| 151 | } | ||
| 152 | |||
| 153 | public static final byte | ||
| 154 | CONSTANT_None = 0, | ||
| 155 | CONSTANT_Utf8 = 1, | ||
| 156 | //CONSTANT_Unicode = 2, /* unused */ | ||
| 157 | CONSTANT_Integer = 3, | ||
| 158 | CONSTANT_Float = 4, | ||
| 159 | CONSTANT_Long = 5, | ||
| 160 | CONSTANT_Double = 6, | ||
| 161 | CONSTANT_Class = 7, | ||
| 162 | CONSTANT_String = 8, | ||
| 163 | CONSTANT_Fieldref = 9, | ||
| 164 | CONSTANT_Methodref = 10, | ||
| 165 | CONSTANT_InterfaceMethodref = 11, | ||
| 166 | CONSTANT_NameAndType = 12; | ||
| 167 | |||
| 168 | private static String[] TAG_NAMES = { | ||
| 169 | "Empty", | ||
| 170 | "Utf8", | ||
| 171 | null, //"Unicode", | ||
| 172 | "Integer", | ||
| 173 | "Float", | ||
| 174 | "Long", | ||
| 175 | "Double", | ||
| 176 | "Class", | ||
| 177 | "String", | ||
| 178 | "Fieldref", | ||
| 179 | "Methodref", | ||
| 180 | "InterfaceMethodref", | ||
| 181 | "NameAndType" | ||
| 182 | }; | ||
| 183 | |||
| 184 | public static String tagName(byte tag) { | ||
| 185 | String name = null; | ||
| 186 | if ((tag & 0xFF) < TAG_NAMES.length) | ||
| 187 | name = TAG_NAMES[tag]; | ||
| 188 | if (name == null) | ||
| 189 | name = "Unknown#"+(tag&0xFF); | ||
| 190 | return name; | ||
| 191 | } | ||
| 192 | } | ||