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      1 /*
      2  * Copyright (C) 2008 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 /**
     18  * One line from the loaded-classes file.
     19  */
     20 class Record {
     21 
     22     /**
     23      * The delimiter character we use, {@code :}, conflicts with some other
     24      * names. In that case, manually replace the delimiter with something else.
     25      */
     26     private static final String[] REPLACE_CLASSES = {
     27             "com.google.android.apps.maps:FriendService",
     28             "com.google.android.apps.maps\\u003AFriendService",
     29             "com.google.android.apps.maps:driveabout",
     30             "com.google.android.apps.maps\\u003Adriveabout",
     31             "com.google.android.apps.maps:LocationFriendService",
     32             "com.google.android.apps.maps\\u003ALocationFriendService",
     33     };
     34 
     35     enum Type {
     36         /** Start of initialization. */
     37         START_LOAD,
     38 
     39         /** End of initialization. */
     40         END_LOAD,
     41 
     42         /** Start of initialization. */
     43         START_INIT,
     44 
     45         /** End of initialization. */
     46         END_INIT
     47     }
     48 
     49     /** Parent process ID. */
     50     final int ppid;
     51 
     52     /** Process ID. */
     53     final int pid;
     54 
     55     /** Thread ID. */
     56     final int tid;
     57 
     58     /** Process name. */
     59     final String processName;
     60 
     61     /** Class loader pointer. */
     62     final int classLoader;
     63 
     64     /** Type of record. */
     65     final Type type;
     66 
     67     /** Name of loaded class. */
     68     final String className;
     69 
     70     /** Record time (ns). */
     71     final long time;
     72 
     73     /** Source file line# */
     74     int sourceLineNumber;
     75 
     76     /**
     77      * Parses a line from the loaded-classes file.
     78      */
     79     Record(String line, int lineNum) {
     80         char typeChar = line.charAt(0);
     81         switch (typeChar) {
     82             case '>': type = Type.START_LOAD; break;
     83             case '<': type = Type.END_LOAD; break;
     84             case '+': type = Type.START_INIT; break;
     85             case '-': type = Type.END_INIT; break;
     86             default: throw new AssertionError("Bad line: " + line);
     87         }
     88 
     89         sourceLineNumber = lineNum;
     90 
     91         for (int i = 0; i < REPLACE_CLASSES.length; i+= 2) {
     92             line = line.replace(REPLACE_CLASSES[i], REPLACE_CLASSES[i+1]);
     93         }
     94 
     95         line = line.substring(1);
     96         String[] parts = line.split(":");
     97 
     98         ppid = Integer.parseInt(parts[0]);
     99         pid = Integer.parseInt(parts[1]);
    100         tid = Integer.parseInt(parts[2]);
    101 
    102         processName = decode(parts[3]).intern();
    103 
    104         classLoader = Integer.parseInt(parts[4]);
    105         className = vmTypeToLanguage(decode(parts[5])).intern();
    106 
    107         time = Long.parseLong(parts[6]);
    108     }
    109 
    110     /**
    111      * Decode any escaping that may have been written to the log line.
    112      *
    113      * Supports unicode-style escaping:  \\uXXXX = character in hex
    114      *
    115      * @param rawField the field as it was written into the log
    116      * @result the same field with any escaped characters replaced
    117      */
    118     String decode(String rawField) {
    119         String result = rawField;
    120         int offset = result.indexOf("\\u");
    121         while (offset >= 0) {
    122             String before = result.substring(0, offset);
    123             String escaped = result.substring(offset+2, offset+6);
    124             String after = result.substring(offset+6);
    125 
    126             result = String.format("%s%c%s", before, Integer.parseInt(escaped, 16), after);
    127 
    128             // find another but don't recurse
    129             offset = result.indexOf("\\u", offset + 1);
    130         }
    131         return result;
    132     }
    133 
    134     /**
    135      * Converts a VM-style name to a language-style name.
    136      */
    137     String vmTypeToLanguage(String typeName) {
    138         // if the typename is (null), just return it as-is.  This is probably in dexopt and
    139         // will be discarded anyway.  NOTE: This corresponds to the case in dalvik/vm/oo/Class.c
    140         // where dvmLinkClass() returns false and we clean up and exit.
    141         if ("(null)".equals(typeName)) {
    142             return typeName;
    143         }
    144 
    145         if (!typeName.startsWith("L") || !typeName.endsWith(";") ) {
    146             throw new AssertionError("Bad name: " + typeName + " in line " + sourceLineNumber);
    147         }
    148 
    149         typeName = typeName.substring(1, typeName.length() - 1);
    150         return typeName.replace("/", ".");
    151     }
    152 }
    153