1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.ddm;
import org.apache.harmony.dalvik.ddmc.Chunk;
import org.apache.harmony.dalvik.ddmc.ChunkHandler;
import org.apache.harmony.dalvik.ddmc.DdmServer;
import org.apache.harmony.dalvik.ddmc.DdmVmInternal;
import android.util.Log;
import java.nio.ByteBuffer;
/**
* Handle thread-related traffic.
*/
public class DdmHandleThread extends ChunkHandler {
public static final int CHUNK_THEN = type("THEN");
public static final int CHUNK_THCR = type("THCR");
public static final int CHUNK_THDE = type("THDE");
public static final int CHUNK_THST = type("THST");
public static final int CHUNK_STKL = type("STKL");
private static DdmHandleThread mInstance = new DdmHandleThread();
/* singleton, do not instantiate */
private DdmHandleThread() {}
/**
* Register for the messages we're interested in.
*/
public static void register() {
DdmServer.registerHandler(CHUNK_THEN, mInstance);
DdmServer.registerHandler(CHUNK_THST, mInstance);
DdmServer.registerHandler(CHUNK_STKL, mInstance);
}
/**
* Called when the DDM server connects. The handler is allowed to
* send messages to the server.
*/
public void connected() {}
/**
* Called when the DDM server disconnects. Can be used to disable
* periodic transmissions or clean up saved state.
*/
public void disconnected() {}
/**
* Handle a chunk of data.
*/
public Chunk handleChunk(Chunk request) {
if (false)
Log.v("ddm-thread", "Handling " + name(request.type) + " chunk");
int type = request.type;
if (type == CHUNK_THEN) {
return handleTHEN(request);
} else if (type == CHUNK_THST) {
return handleTHST(request);
} else if (type == CHUNK_STKL) {
return handleSTKL(request);
} else {
throw new RuntimeException("Unknown packet "
+ ChunkHandler.name(type));
}
}
/*
* Handle a "THread notification ENable" request.
*/
private Chunk handleTHEN(Chunk request) {
ByteBuffer in = wrapChunk(request);
boolean enable = (in.get() != 0);
//Log.i("ddm-thread", "Thread notify enable: " + enable);
DdmVmInternal.threadNotify(enable);
return null; // empty response
}
/*
* Handle a "THread STatus" request. This is constructed by the VM.
*/
private Chunk handleTHST(Chunk request) {
ByteBuffer in = wrapChunk(request);
// currently nothing to read from "in"
//Log.d("ddm-thread", "Thread status request");
byte[] status = DdmVmInternal.getThreadStats();
if (status != null)
return new Chunk(CHUNK_THST, status, 0, status.length);
else
return createFailChunk(1, "Can't build THST chunk");
}
/*
* Handle a STacK List request.
*
* This is done by threadId, which isn't great since those are
* recycled. We need a thread serial ID. The Linux tid is an okay
* answer as it's unlikely to recycle at the exact wrong moment.
* However, we're using the short threadId in THST messages, so we
* use them here for consistency. (One thought is to keep the current
* thread ID in the low 16 bits and somehow serialize the top 16 bits.)
*/
private Chunk handleSTKL(Chunk request) {
ByteBuffer in = wrapChunk(request);
int threadId;
threadId = in.getInt();
//Log.d("ddm-thread", "Stack list request " + threadId);
StackTraceElement[] trace = DdmVmInternal.getStackTraceById(threadId);
if (trace == null) {
return createFailChunk(1, "Stack trace unavailable");
} else {
return createStackChunk(trace, threadId);
}
}
/*
* Serialize a StackTraceElement[] into an STKL chunk.
*
* We include the threadId in the response so the other side doesn't have
* to match up requests and responses as carefully.
*/
private Chunk createStackChunk(StackTraceElement[] trace, int threadId) {
int bufferSize = 0;
bufferSize += 4; // version, flags, whatever
bufferSize += 4; // thread ID
bufferSize += 4; // frame count
for (StackTraceElement elem : trace) {
bufferSize += 4 + elem.getClassName().length() * 2;
bufferSize += 4 + elem.getMethodName().length() * 2;
bufferSize += 4;
if (elem.getFileName() != null)
bufferSize += elem.getFileName().length() * 2;
bufferSize += 4; // line number
}
ByteBuffer out = ByteBuffer.allocate(bufferSize);
out.putInt(0);
out.putInt(threadId);
out.putInt(trace.length);
for (StackTraceElement elem : trace) {
out.putInt(elem.getClassName().length());
putString(out, elem.getClassName());
out.putInt(elem.getMethodName().length());
putString(out, elem.getMethodName());
if (elem.getFileName() != null) {
out.putInt(elem.getFileName().length());
putString(out, elem.getFileName());
} else {
out.putInt(0);
}
out.putInt(elem.getLineNumber());
}
return new Chunk(CHUNK_STKL, out);
}
}
|
