1 /* 2 * Copyright (C) 2007 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 package android.ddm; 18 19 import org.apache.harmony.dalvik.ddmc.Chunk; 20 import org.apache.harmony.dalvik.ddmc.ChunkHandler; 21 import org.apache.harmony.dalvik.ddmc.DdmServer; 22 import org.apache.harmony.dalvik.ddmc.DdmVmInternal; 23 import android.util.Log; 24 import java.nio.ByteBuffer; 25 26 /** 27 * Handle thread-related traffic. 28 */ 29 public class DdmHandleThread extends ChunkHandler { 30 31 public static final int CHUNK_THEN = type("THEN"); 32 public static final int CHUNK_THCR = type("THCR"); 33 public static final int CHUNK_THDE = type("THDE"); 34 public static final int CHUNK_THST = type("THST"); 35 public static final int CHUNK_STKL = type("STKL"); 36 37 private static DdmHandleThread mInstance = new DdmHandleThread(); 38 39 40 /* singleton, do not instantiate */ DdmHandleThread()41 private DdmHandleThread() {} 42 43 /** 44 * Register for the messages we're interested in. 45 */ register()46 public static void register() { 47 DdmServer.registerHandler(CHUNK_THEN, mInstance); 48 DdmServer.registerHandler(CHUNK_THST, mInstance); 49 DdmServer.registerHandler(CHUNK_STKL, mInstance); 50 } 51 52 /** 53 * Called when the DDM server connects. The handler is allowed to 54 * send messages to the server. 55 */ connected()56 public void connected() {} 57 58 /** 59 * Called when the DDM server disconnects. Can be used to disable 60 * periodic transmissions or clean up saved state. 61 */ disconnected()62 public void disconnected() {} 63 64 /** 65 * Handle a chunk of data. 66 */ handleChunk(Chunk request)67 public Chunk handleChunk(Chunk request) { 68 if (false) 69 Log.v("ddm-thread", "Handling " + name(request.type) + " chunk"); 70 int type = request.type; 71 72 if (type == CHUNK_THEN) { 73 return handleTHEN(request); 74 } else if (type == CHUNK_THST) { 75 return handleTHST(request); 76 } else if (type == CHUNK_STKL) { 77 return handleSTKL(request); 78 } else { 79 throw new RuntimeException("Unknown packet " 80 + ChunkHandler.name(type)); 81 } 82 } 83 84 /* 85 * Handle a "THread notification ENable" request. 86 */ handleTHEN(Chunk request)87 private Chunk handleTHEN(Chunk request) { 88 ByteBuffer in = wrapChunk(request); 89 90 boolean enable = (in.get() != 0); 91 //Log.i("ddm-thread", "Thread notify enable: " + enable); 92 93 DdmVmInternal.threadNotify(enable); 94 return null; // empty response 95 } 96 97 /* 98 * Handle a "THread STatus" request. This is constructed by the VM. 99 */ handleTHST(Chunk request)100 private Chunk handleTHST(Chunk request) { 101 ByteBuffer in = wrapChunk(request); 102 // currently nothing to read from "in" 103 104 //Log.d("ddm-thread", "Thread status request"); 105 106 byte[] status = DdmVmInternal.getThreadStats(); 107 if (status != null) 108 return new Chunk(CHUNK_THST, status, 0, status.length); 109 else 110 return createFailChunk(1, "Can't build THST chunk"); 111 } 112 113 /* 114 * Handle a STacK List request. 115 * 116 * This is done by threadId, which isn't great since those are 117 * recycled. We need a thread serial ID. The Linux tid is an okay 118 * answer as it's unlikely to recycle at the exact wrong moment. 119 * However, we're using the short threadId in THST messages, so we 120 * use them here for consistency. (One thought is to keep the current 121 * thread ID in the low 16 bits and somehow serialize the top 16 bits.) 122 */ handleSTKL(Chunk request)123 private Chunk handleSTKL(Chunk request) { 124 ByteBuffer in = wrapChunk(request); 125 int threadId; 126 127 threadId = in.getInt(); 128 129 //Log.d("ddm-thread", "Stack list request " + threadId); 130 131 StackTraceElement[] trace = DdmVmInternal.getStackTraceById(threadId); 132 if (trace == null) { 133 return createFailChunk(1, "Stack trace unavailable"); 134 } else { 135 return createStackChunk(trace, threadId); 136 } 137 } 138 139 /* 140 * Serialize a StackTraceElement[] into an STKL chunk. 141 * 142 * We include the threadId in the response so the other side doesn't have 143 * to match up requests and responses as carefully. 144 */ createStackChunk(StackTraceElement[] trace, int threadId)145 private Chunk createStackChunk(StackTraceElement[] trace, int threadId) { 146 int bufferSize = 0; 147 148 bufferSize += 4; // version, flags, whatever 149 bufferSize += 4; // thread ID 150 bufferSize += 4; // frame count 151 for (StackTraceElement elem : trace) { 152 bufferSize += 4 + elem.getClassName().length() * 2; 153 bufferSize += 4 + elem.getMethodName().length() * 2; 154 bufferSize += 4; 155 if (elem.getFileName() != null) 156 bufferSize += elem.getFileName().length() * 2; 157 bufferSize += 4; // line number 158 } 159 160 ByteBuffer out = ByteBuffer.allocate(bufferSize); 161 out.putInt(0); 162 out.putInt(threadId); 163 out.putInt(trace.length); 164 for (StackTraceElement elem : trace) { 165 out.putInt(elem.getClassName().length()); 166 putString(out, elem.getClassName()); 167 out.putInt(elem.getMethodName().length()); 168 putString(out, elem.getMethodName()); 169 if (elem.getFileName() != null) { 170 out.putInt(elem.getFileName().length()); 171 putString(out, elem.getFileName()); 172 } else { 173 out.putInt(0); 174 } 175 out.putInt(elem.getLineNumber()); 176 } 177 178 return new Chunk(CHUNK_STKL, out); 179 } 180 } 181 182