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.Config; 24 import android.util.Log; 25 import java.nio.ByteBuffer; 26 27 /** 28 * Handle thread-related traffic. 29 */ 30 public class DdmHandleThread extends ChunkHandler { 31 32 public static final int CHUNK_THEN = type("THEN"); 33 public static final int CHUNK_THCR = type("THCR"); 34 public static final int CHUNK_THDE = type("THDE"); 35 public static final int CHUNK_THST = type("THST"); 36 public static final int CHUNK_STKL = type("STKL"); 37 38 private static DdmHandleThread mInstance = new DdmHandleThread(); 39 40 41 /* singleton, do not instantiate */ DdmHandleThread()42 private DdmHandleThread() {} 43 44 /** 45 * Register for the messages we're interested in. 46 */ register()47 public static void register() { 48 DdmServer.registerHandler(CHUNK_THEN, mInstance); 49 DdmServer.registerHandler(CHUNK_THST, mInstance); 50 DdmServer.registerHandler(CHUNK_STKL, mInstance); 51 } 52 53 /** 54 * Called when the DDM server connects. The handler is allowed to 55 * send messages to the server. 56 */ connected()57 public void connected() {} 58 59 /** 60 * Called when the DDM server disconnects. Can be used to disable 61 * periodic transmissions or clean up saved state. 62 */ disconnected()63 public void disconnected() {} 64 65 /** 66 * Handle a chunk of data. 67 */ handleChunk(Chunk request)68 public Chunk handleChunk(Chunk request) { 69 if (Config.LOGV) 70 Log.v("ddm-thread", "Handling " + name(request.type) + " chunk"); 71 int type = request.type; 72 73 if (type == CHUNK_THEN) { 74 return handleTHEN(request); 75 } else if (type == CHUNK_THST) { 76 return handleTHST(request); 77 } else if (type == CHUNK_STKL) { 78 return handleSTKL(request); 79 } else { 80 throw new RuntimeException("Unknown packet " 81 + ChunkHandler.name(type)); 82 } 83 } 84 85 /* 86 * Handle a "THread notification ENable" request. 87 */ handleTHEN(Chunk request)88 private Chunk handleTHEN(Chunk request) { 89 ByteBuffer in = wrapChunk(request); 90 91 boolean enable = (in.get() != 0); 92 //Log.i("ddm-thread", "Thread notify enable: " + enable); 93 94 DdmVmInternal.threadNotify(enable); 95 return null; // empty response 96 } 97 98 /* 99 * Handle a "THread STatus" request. This is constructed by the VM. 100 */ handleTHST(Chunk request)101 private Chunk handleTHST(Chunk request) { 102 ByteBuffer in = wrapChunk(request); 103 // currently nothing to read from "in" 104 105 //Log.d("ddm-thread", "Thread status request"); 106 107 byte[] status = DdmVmInternal.getThreadStats(); 108 if (status != null) 109 return new Chunk(CHUNK_THST, status, 0, status.length); 110 else 111 return createFailChunk(1, "Can't build THST chunk"); 112 } 113 114 /* 115 * Handle a STacK List request. 116 * 117 * This is done by threadId, which isn't great since those are 118 * recycled. We need a thread serial ID. The Linux tid is an okay 119 * answer as it's unlikely to recycle at the exact wrong moment. 120 * However, we're using the short threadId in THST messages, so we 121 * use them here for consistency. (One thought is to keep the current 122 * thread ID in the low 16 bits and somehow serialize the top 16 bits.) 123 */ handleSTKL(Chunk request)124 private Chunk handleSTKL(Chunk request) { 125 ByteBuffer in = wrapChunk(request); 126 int threadId; 127 128 threadId = in.getInt(); 129 130 //Log.d("ddm-thread", "Stack list request " + threadId); 131 132 StackTraceElement[] trace = DdmVmInternal.getStackTraceById(threadId); 133 if (trace == null) { 134 return createFailChunk(1, "Stack trace unavailable"); 135 } else { 136 return createStackChunk(trace, threadId); 137 } 138 } 139 140 /* 141 * Serialize a StackTraceElement[] into an STKL chunk. 142 * 143 * We include the threadId in the response so the other side doesn't have 144 * to match up requests and responses as carefully. 145 */ createStackChunk(StackTraceElement[] trace, int threadId)146 private Chunk createStackChunk(StackTraceElement[] trace, int threadId) { 147 int bufferSize = 0; 148 149 bufferSize += 4; // version, flags, whatever 150 bufferSize += 4; // thread ID 151 bufferSize += 4; // frame count 152 for (StackTraceElement elem : trace) { 153 bufferSize += 4 + elem.getClassName().length() * 2; 154 bufferSize += 4 + elem.getMethodName().length() * 2; 155 bufferSize += 4; 156 if (elem.getFileName() != null) 157 bufferSize += elem.getFileName().length() * 2; 158 bufferSize += 4; // line number 159 } 160 161 ByteBuffer out = ByteBuffer.allocate(bufferSize); 162 out.putInt(0); 163 out.putInt(threadId); 164 out.putInt(trace.length); 165 for (StackTraceElement elem : trace) { 166 out.putInt(elem.getClassName().length()); 167 putString(out, elem.getClassName()); 168 out.putInt(elem.getMethodName().length()); 169 putString(out, elem.getMethodName()); 170 if (elem.getFileName() != null) { 171 out.putInt(elem.getFileName().length()); 172 putString(out, elem.getFileName()); 173 } else { 174 out.putInt(0); 175 } 176 out.putInt(elem.getLineNumber()); 177 } 178 179 return new Chunk(CHUNK_STKL, out); 180 } 181 } 182 183