/*
 * 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/*
 * This file is available under and governed by the GNU General Public
 * License version 2 only, as published by the Free Software Foundation.
 * However, the following notice accompanied the original version of this
 * file:
 *
 * ASM: a very small and fast Java bytecode manipulation framework
 * Copyright (c) 2000-2011 INRIA, France Telecom
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the copyright holders nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */
package jdk.internal.org.objectweb.asm.signature;

A type signature parser to make a signature visitor visit an existing signature.
Author:Thomas Hallgren, Eric Bruneton
/** * A type signature parser to make a signature visitor visit an existing * signature. * * @author Thomas Hallgren * @author Eric Bruneton */
public class SignatureReader {
The signature to be read.
/** * The signature to be read. */
private final String signature;
Constructs a SignatureReader for the given signature.
Params:
  • signature – A ClassSignature, MethodTypeSignature, or FieldTypeSignature.
/** * Constructs a {@link SignatureReader} for the given signature. * * @param signature * A <i>ClassSignature</i>, <i>MethodTypeSignature</i>, or * <i>FieldTypeSignature</i>. */
public SignatureReader(final String signature) { this.signature = signature; }
Makes the given visitor visit the signature of this SignatureReader. This signature is the one specified in the constructor (see SignatureReader). This method is intended to be called on a SignatureReader that was created using a ClassSignature (such as the signature parameter of the ClassVisitor.visit method) or a MethodTypeSignature (such as the signature parameter of the ClassVisitor.visitMethod method).
Params:
  • v – the visitor that must visit this signature.
/** * Makes the given visitor visit the signature of this * {@link SignatureReader}. This signature is the one specified in the * constructor (see {@link #SignatureReader(String) SignatureReader}). This * method is intended to be called on a {@link SignatureReader} that was * created using a <i>ClassSignature</i> (such as the <code>signature</code> * parameter of the {@link jdk.internal.org.objectweb.asm.ClassVisitor#visit * ClassVisitor.visit} method) or a <i>MethodTypeSignature</i> (such as the * <code>signature</code> parameter of the * {@link jdk.internal.org.objectweb.asm.ClassVisitor#visitMethod * ClassVisitor.visitMethod} method). * * @param v * the visitor that must visit this signature. */
public void accept(final SignatureVisitor v) { String signature = this.signature; int len = signature.length(); int pos; char c; if (signature.charAt(0) == '<') { pos = 2; do { int end = signature.indexOf(':', pos); v.visitFormalTypeParameter(signature.substring(pos - 1, end)); pos = end + 1; c = signature.charAt(pos); if (c == 'L' || c == '[' || c == 'T') { pos = parseType(signature, pos, v.visitClassBound()); } while ((c = signature.charAt(pos++)) == ':') { pos = parseType(signature, pos, v.visitInterfaceBound()); } } while (c != '>'); } else { pos = 0; } if (signature.charAt(pos) == '(') { pos++; while (signature.charAt(pos) != ')') { pos = parseType(signature, pos, v.visitParameterType()); } pos = parseType(signature, pos + 1, v.visitReturnType()); while (pos < len) { pos = parseType(signature, pos + 1, v.visitExceptionType()); } } else { pos = parseType(signature, pos, v.visitSuperclass()); while (pos < len) { pos = parseType(signature, pos, v.visitInterface()); } } }
Makes the given visitor visit the signature of this SignatureReader. This signature is the one specified in the constructor (see SignatureReader). This method is intended to be called on a SignatureReader that was created using a FieldTypeSignature, such as the signature parameter of the ClassVisitor.visitField or MethodVisitor.visitLocalVariable methods.
Params:
  • v – the visitor that must visit this signature.
/** * Makes the given visitor visit the signature of this * {@link SignatureReader}. This signature is the one specified in the * constructor (see {@link #SignatureReader(String) SignatureReader}). This * method is intended to be called on a {@link SignatureReader} that was * created using a <i>FieldTypeSignature</i>, such as the * <code>signature</code> parameter of the * {@link jdk.internal.org.objectweb.asm.ClassVisitor#visitField ClassVisitor.visitField} * or {@link jdk.internal.org.objectweb.asm.MethodVisitor#visitLocalVariable * MethodVisitor.visitLocalVariable} methods. * * @param v * the visitor that must visit this signature. */
public void acceptType(final SignatureVisitor v) { parseType(this.signature, 0, v); }
Parses a field type signature and makes the given visitor visit it.
Params:
  • signature – a string containing the signature that must be parsed.
  • pos – index of the first character of the signature to parsed.
  • v – the visitor that must visit this signature.
Returns:the index of the first character after the parsed signature.
/** * Parses a field type signature and makes the given visitor visit it. * * @param signature * a string containing the signature that must be parsed. * @param pos * index of the first character of the signature to parsed. * @param v * the visitor that must visit this signature. * @return the index of the first character after the parsed signature. */
private static int parseType(final String signature, int pos, final SignatureVisitor v) { char c; int start, end; boolean visited, inner; String name; switch (c = signature.charAt(pos++)) { case 'Z': case 'C': case 'B': case 'S': case 'I': case 'F': case 'J': case 'D': case 'V': v.visitBaseType(c); return pos; case '[': return parseType(signature, pos, v.visitArrayType()); case 'T': end = signature.indexOf(';', pos); v.visitTypeVariable(signature.substring(pos, end)); return end + 1; default: // case 'L': start = pos; visited = false; inner = false; for (;;) { switch (c = signature.charAt(pos++)) { case '.': case ';': if (!visited) { name = signature.substring(start, pos - 1); if (inner) { v.visitInnerClassType(name); } else { v.visitClassType(name); } } if (c == ';') { v.visitEnd(); return pos; } start = pos; visited = false; inner = true; break; case '<': name = signature.substring(start, pos - 1); if (inner) { v.visitInnerClassType(name); } else { v.visitClassType(name); } visited = true; top: for (;;) { switch (c = signature.charAt(pos)) { case '>': break top; case '*': ++pos; v.visitTypeArgument(); break; case '+': case '-': pos = parseType(signature, pos + 1, v.visitTypeArgument(c)); break; default: pos = parseType(signature, pos, v.visitTypeArgument('=')); break; } } } } } } }