| /* |
| * Copyright (c) 2008, 2011, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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| */ |
| |
| package sun.invoke.anon; |
| |
| /** |
| * A visitor called by {@link ConstantPoolParser#parse(ConstantPoolVisitor)} |
| * when a constant pool entry is parsed. |
| * <p> |
| * A visit* method is called when a constant pool entry is parsed. |
| * The first argument is always the constant pool index. |
| * The second argument is always the constant pool tag, |
| * even for methods like {@link #visitUTF8(int, byte, String)} which only apply to one tag. |
| * String arguments refer to Utf8 or NameAndType entries declared elsewhere, |
| * and are always accompanied by the indexes of those entries. |
| * <p> |
| * The order of the calls to the visit* methods is not necessarily related |
| * to the order of the entries in the constant pool. |
| * If one entry has a reference to another entry, the latter (lower-level) |
| * entry will be visited first. |
| * <p> |
| * The following table shows the relation between constant pool entry |
| * types and the corresponding visit* methods: |
| * |
| * <table border=1 cellpadding=5 summary="constant pool visitor methods"> |
| * <tr><th>Tag(s)</th><th>Method</th></tr> |
| * <tr> |
| * <td>{@link #CONSTANT_Utf8}</td> |
| * <td>{@link #visitUTF8(int, byte, String)}</td> |
| * </tr><tr> |
| * <td>{@link #CONSTANT_Integer}, {@link #CONSTANT_Float}, |
| * {@link #CONSTANT_Long}, {@link #CONSTANT_Double}</td> |
| * <td>{@link #visitConstantValue(int, byte, Object)}</td> |
| * </tr><tr> |
| * <td>{@link #CONSTANT_String}, {@link #CONSTANT_Class}</td> |
| * <td>{@link #visitConstantString(int, byte, String, int)}</td> |
| * </tr><tr> |
| * <td>{@link #CONSTANT_NameAndType}</td> |
| * <td>{@link #visitDescriptor(int, byte, String, String, int, int)}</td> |
| * </tr><tr> |
| * <td>{@link #CONSTANT_Fieldref}, |
| * {@link #CONSTANT_Methodref}, |
| * {@link #CONSTANT_InterfaceMethodref}</td> |
| * <td>{@link #visitMemberRef(int, byte, String, String, String, int, int)}</td> |
| * </tr> |
| * </table> |
| * |
| * @see ConstantPoolPatch |
| * @author Remi Forax |
| * @author jrose |
| */ |
| public class ConstantPoolVisitor { |
| /** Called each time an UTF8 constant pool entry is found. |
| * @param index the constant pool index |
| * @param tag always {@link #CONSTANT_Utf8} |
| * @param utf8 string encoded in modified UTF-8 format passed as a {@code String} |
| * |
| * @see ConstantPoolPatch#putUTF8(int, String) |
| */ |
| public void visitUTF8(int index, byte tag, String utf8) { |
| // do nothing |
| } |
| |
| /** Called for each constant pool entry that encodes an integer, |
| * a float, a long, or a double. |
| * Constant strings and classes are not managed by this method but |
| * by {@link #visitConstantString(int, byte, String, int)}. |
| * |
| * @param index the constant pool index |
| * @param tag one of {@link #CONSTANT_Integer}, |
| * {@link #CONSTANT_Float}, |
| * {@link #CONSTANT_Long}, |
| * or {@link #CONSTANT_Double} |
| * @param value encoded value |
| * |
| * @see ConstantPoolPatch#putConstantValue(int, Object) |
| */ |
| public void visitConstantValue(int index, byte tag, Object value) { |
| // do nothing |
| } |
| |
| /** Called for each constant pool entry that encodes a string or a class. |
| * @param index the constant pool index |
| * @param tag one of {@link #CONSTANT_String}, |
| * {@link #CONSTANT_Class}, |
| * @param name string body or class name (using dot separator) |
| * @param nameIndex the index of the Utf8 string for the name |
| * |
| * @see ConstantPoolPatch#putConstantValue(int, byte, Object) |
| */ |
| public void visitConstantString(int index, byte tag, |
| String name, int nameIndex) { |
| // do nothing |
| } |
| |
| /** Called for each constant pool entry that encodes a name and type. |
| * @param index the constant pool index |
| * @param tag always {@link #CONSTANT_NameAndType} |
| * @param memberName a field or method name |
| * @param signature the member signature |
| * @param memberNameIndex index of the Utf8 string for the member name |
| * @param signatureIndex index of the Utf8 string for the signature |
| * |
| * @see ConstantPoolPatch#putDescriptor(int, String, String) |
| */ |
| public void visitDescriptor(int index, byte tag, |
| String memberName, String signature, |
| int memberNameIndex, int signatureIndex) { |
| // do nothing |
| } |
| |
| /** Called for each constant pool entry that encodes a field or method. |
| * @param index the constant pool index |
| * @param tag one of {@link #CONSTANT_Fieldref}, |
| * or {@link #CONSTANT_Methodref}, |
| * or {@link #CONSTANT_InterfaceMethodref} |
| * @param className the class name (using dot separator) |
| * @param memberName name of the field or method |
| * @param signature the field or method signature |
| * @param classNameIndex index of the Utf8 string for the class name |
| * @param descriptorIndex index of the NameAndType descriptor constant |
| * |
| * @see ConstantPoolPatch#putMemberRef(int, byte, String, String, String) |
| */ |
| public void visitMemberRef(int index, byte tag, |
| String className, String memberName, String signature, |
| int classNameIndex, int descriptorIndex) { |
| // do nothing |
| } |
| |
| public static final byte |
| CONSTANT_None = 0, |
| CONSTANT_Utf8 = 1, |
| //CONSTANT_Unicode = 2, /* unused */ |
| CONSTANT_Integer = 3, |
| CONSTANT_Float = 4, |
| CONSTANT_Long = 5, |
| CONSTANT_Double = 6, |
| CONSTANT_Class = 7, |
| CONSTANT_String = 8, |
| CONSTANT_Fieldref = 9, |
| CONSTANT_Methodref = 10, |
| CONSTANT_InterfaceMethodref = 11, |
| CONSTANT_NameAndType = 12; |
| |
| private static String[] TAG_NAMES = { |
| "Empty", |
| "Utf8", |
| null, //"Unicode", |
| "Integer", |
| "Float", |
| "Long", |
| "Double", |
| "Class", |
| "String", |
| "Fieldref", |
| "Methodref", |
| "InterfaceMethodref", |
| "NameAndType" |
| }; |
| |
| public static String tagName(byte tag) { |
| String name = null; |
| if ((tag & 0xFF) < TAG_NAMES.length) |
| name = TAG_NAMES[tag]; |
| if (name == null) |
| name = "Unknown#"+(tag&0xFF); |
| return name; |
| } |
| } |
