1 /*
   2  * Copyright (c) 2015, 2016, 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 package jdk.internal.jimage.decompressor;
  26 
  27 import java.util.ArrayList;
  28 import java.util.List;
  29 
  30 /**
  31  *
  32  * A descriptor parser used to extract java type strings from
  33  * UTF_8 descriptors.
  34  *
  35  * @implNote This class needs to maintain JDK 8 source compatibility.
  36  *
  37  * It is used internally in the JDK to implement jimage/jrtfs access,
  38  * but also compiled and delivered as part of the jrtfs.jar to support access
  39  * to the jimage file provided by the shipped JDK by tools running on JDK 8.
  40  */
  41 public class SignatureParser {
  42 
  43    public static class ParseResult {
  44 
  45         public final List<String> types = new ArrayList<>();
  46         public String formatted;
  47         private ParseResult() {}
  48     }
  49 
  50     private SignatureParser() {}
  51 
  52     public static String reconstruct(String formatted, List<String> arguments) {
  53         int arg_index = 0;
  54         char[] chars = formatted.toCharArray();
  55         StringBuilder out = new StringBuilder();
  56 
  57         for (int i = 0; i < chars.length; i++) {
  58             char c = chars[i];
  59             out.append(c);
  60             switch (c) {
  61                 case 'L': {
  62                     String pkg = arguments.get(arg_index);
  63                     if(!pkg.isEmpty()) {
  64                         out.append(pkg).append("/");
  65                     }
  66                     arg_index+=1;
  67                     out.append(arguments.get(arg_index));
  68                     arg_index+=1;
  69                     break;
  70                 }
  71                 default: {
  72                     break;
  73                 }
  74             }
  75         }
  76         return out.toString();
  77     }
  78 
  79     public static ParseResult parseSignatureDescriptor(String str) {
  80         ParseResult res = new ParseResult();
  81         char[] chars = str.toCharArray();
  82         StringBuilder type = null;
  83         StringBuilder formatted = new StringBuilder();
  84         for (int i = 0; i < chars.length; i++) {
  85             char c = chars[i];
  86             switch (c) {
  87                 case ';':
  88                 case ':':
  89                 case '<': {
  90                     if(type != null) {
  91                         String fullName = type.toString();
  92                         int endIndex = fullName.lastIndexOf("/");
  93                         String clazz = fullName;
  94                         String pkg = "";
  95                         if(endIndex != -1) {
  96                             pkg = fullName.substring(0, endIndex);
  97                             clazz = fullName.substring(endIndex+1);
  98                         }
  99                         res.types.add(pkg);
 100                         res.types.add(clazz);
 101                     }
 102                     formatted.append(c);
 103 
 104                     type = null;
 105                     break;
 106                 }
 107                 case 'L': {
 108                     if(type == null) {
 109                         type = new StringBuilder();
 110                         formatted.append(c);
 111                     } else {
 112                         type.append(c);
 113                     }
 114                     break;
 115                 }
 116                 default: {
 117                     if(type == null) {
 118                         formatted.append(c);
 119                     } else {
 120                         type.append(c);
 121                     }
 122                     break;
 123                 }
 124             }
 125         }
 126         res.formatted = formatted.toString();
 127         return res;
 128     }
 129 }