Record.java revision 9066cfe9886ac131c34d59ed0e2d287b0e3c0087 
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 */
20class Record {
21
22    enum Type {
23        /** Start of initialization. */
24        START_LOAD,
25
26        /** End of initialization. */
27        END_LOAD,
28
29        /** Start of initialization. */
30        START_INIT,
31
32        /** End of initialization. */
33        END_INIT
34    }
35
36    /** Parent process ID. */
37    final int ppid;
38
39    /** Process ID. */
40    final int pid;
41
42    /** Thread ID. */
43    final int tid;
44
45    /** Process name. */
46    final String processName;
47
48    /** Class loader pointer. */
49    final int classLoader;
50
51    /** Type of record. */
52    final Type type;
53
54    /** Name of loaded class. */
55    final String className;
56
57    /** Record time (ns). */
58    final long time;
59
60    /** Source file line# */
61    int sourceLineNumber;
62
63    /**
64     * Parses a line from the loaded-classes file.
65     */
66    Record(String line, int lineNum) {
67        char typeChar = line.charAt(0);
68        switch (typeChar) {
69            case '>': type = Type.START_LOAD; break;
70            case '<': type = Type.END_LOAD; break;
71            case '+': type = Type.START_INIT; break;
72            case '-': type = Type.END_INIT; break;
73            default: throw new AssertionError("Bad line: " + line);
74        }
75
76        sourceLineNumber = lineNum;
77
78        line = line.substring(1);
79        String[] parts = line.split(":");
80
81        ppid = Integer.parseInt(parts[0]);
82        pid = Integer.parseInt(parts[1]);
83        tid = Integer.parseInt(parts[2]);
84
85        processName = decode(parts[3]).intern();
86
87        classLoader = Integer.parseInt(parts[4]);
88        className = vmTypeToLanguage(decode(parts[5])).intern();
89
90        time = Long.parseLong(parts[6]);
91    }
92
93    /**
94     * Decode any escaping that may have been written to the log line.
95     *
96     * Supports unicode-style escaping:  \\uXXXX = character in hex
97     *
98     * @param rawField the field as it was written into the log
99     * @result the same field with any escaped characters replaced
100     */
101    String decode(String rawField) {
102        String result = rawField;
103        int offset = result.indexOf("\\u");
104        while (offset >= 0) {
105            String before = result.substring(0, offset);
106            String escaped = result.substring(offset+2, offset+6);
107            String after = result.substring(offset+6);
108
109            result = String.format("%s%c%s", before, Integer.parseInt(escaped, 16), after);
110
111            // find another but don't recurse
112            offset = result.indexOf("\\u", offset + 1);
113        }
114        return result;
115    }
116
117    /**
118     * Converts a VM-style name to a language-style name.
119     */
120    String vmTypeToLanguage(String typeName) {
121        // if the typename is (null), just return it as-is.  This is probably in dexopt and
122        // will be discarded anyway.  NOTE: This corresponds to the case in dalvik/vm/oo/Class.c
123        // where dvmLinkClass() returns false and we clean up and exit.
124        if ("(null)".equals(typeName)) {
125            return typeName;
126        }
127
128        if (!typeName.startsWith("L") || !typeName.endsWith(";") ) {
129            throw new AssertionError("Bad name: " + typeName + " in line " + sourceLineNumber);
130        }
131
132        typeName = typeName.substring(1, typeName.length() - 1);
133        return typeName.replace("/", ".");
134    }
135}
136