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/*
* 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.Config;
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 (Config.LOGV)
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);
}
}
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