2 * Copyright (C) 2008 The Android Open Source Project
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
18 * Handle Dalvik Debug Monitor requests and events.
20 * Remember that all DDM traffic is big-endian since it travels over the
29 * "buf" contains a full JDWP packet, possibly with multiple chunks. We
30 * need to process each, accumulate the replies, and ship the whole thing
33 * Returns "true" if we have a reply. The reply buffer is newly allocated,
34 * and includes the chunk type/length, followed by the data.
36 * TODO: we currently assume that the request and reply include a single
37 * chunk. If this becomes inconvenient we will need to adapt.
39 bool dvmDdmHandlePacket(const u1* buf, int dataLen, u1** pReplyBuf,
42 Thread* self = dvmThreadSelf();
43 const int kChunkHdrLen = 8;
44 ArrayObject* dataArray = NULL;
50 if (!dvmIsClassInitialized(gDvm.classOrgApacheHarmonyDalvikDdmcChunk)) {
51 if (!dvmInitClass(gDvm.classOrgApacheHarmonyDalvikDdmcChunk)) {
52 dvmLogExceptionStackTrace();
53 dvmClearException(self);
59 * The chunk handlers are written in the Java programming language, so
60 * we need to convert the buffer to a byte array.
62 dataArray = dvmAllocPrimitiveArray('B', dataLen, ALLOC_DEFAULT);
63 if (dataArray == NULL) {
64 ALOGW("array alloc failed (%d)", dataLen);
65 dvmClearException(self);
68 memcpy(dataArray->contents, buf, dataLen);
71 * Run through and find all chunks. [Currently just find the first.]
73 unsigned int offset, length, type;
74 type = get4BE((u1*)dataArray->contents + 0);
75 length = get4BE((u1*)dataArray->contents + 4);
76 offset = kChunkHdrLen;
77 if (offset+length > (unsigned int) dataLen) {
78 ALOGW("WARNING: bad chunk found (len=%u pktLen=%d)", length, dataLen);
86 dvmCallMethod(self, gDvm.methDalvikDdmcServer_dispatch, NULL, &callRes,
87 type, dataArray, offset, length);
88 if (dvmCheckException(self)) {
89 ALOGI("Exception thrown by dispatcher for 0x%08x", type);
90 dvmLogExceptionStackTrace();
91 dvmClearException(self);
95 ArrayObject* replyData;
96 chunk = (Object*) callRes.l;
100 /* not strictly necessary -- we don't alloc from managed heap here */
101 dvmAddTrackedAlloc(chunk, self);
104 * Pull the pieces out of the chunk. We copy the results into a
105 * newly-allocated buffer that the caller can free. We don't want to
106 * continue using the Chunk object because nothing has a reference to it.
108 * We could avoid this by returning type/data/offset/length and having
109 * the caller be aware of the object lifetime issues, but that
110 * integrates the JDWP code more tightly into the VM, and doesn't work
111 * if we have responses for multiple chunks.
113 * So we're pretty much stuck with copying data around multiple times.
115 type = dvmGetFieldInt(chunk, gDvm.offDalvikDdmcChunk_type);
117 (ArrayObject*) dvmGetFieldObject(chunk, gDvm.offDalvikDdmcChunk_data);
118 offset = dvmGetFieldInt(chunk, gDvm.offDalvikDdmcChunk_offset);
119 length = dvmGetFieldInt(chunk, gDvm.offDalvikDdmcChunk_length);
121 ALOGV("DDM reply: type=0x%08x data=%p offset=%d length=%d",
122 type, replyData, offset, length);
124 if (length == 0 || replyData == NULL)
126 if (offset + length > replyData->length) {
127 ALOGW("WARNING: chunk off=%d len=%d exceeds reply array len %d",
128 offset, length, replyData->length);
133 reply = (u1*) malloc(length + kChunkHdrLen);
135 ALOGW("malloc %d failed", length+kChunkHdrLen);
138 set4BE(reply + 0, type);
139 set4BE(reply + 4, length);
140 memcpy(reply+kChunkHdrLen, (const u1*)replyData->contents + offset, length);
143 *pReplyLen = length + kChunkHdrLen;
146 ALOGV("dvmHandleDdm returning type=%.4s buf=%p len=%d",
147 (char*) reply, reply, length);
150 dvmReleaseTrackedAlloc((Object*) dataArray, self);
151 dvmReleaseTrackedAlloc(chunk, self);
155 /* defined in org.apache.harmony.dalvik.ddmc.DdmServer */
157 #define DISCONNECTED 2
160 * Broadcast an event to all handlers.
162 static void broadcast(int event)
164 Thread* self = dvmThreadSelf();
166 if (self->status != THREAD_RUNNING) {
167 ALOGE("ERROR: DDM broadcast with thread status=%d", self->status);
171 if (!dvmIsClassInitialized(gDvm.classOrgApacheHarmonyDalvikDdmcDdmServer)) {
172 if (!dvmInitClass(gDvm.classOrgApacheHarmonyDalvikDdmcDdmServer)) {
173 dvmLogExceptionStackTrace();
174 dvmClearException(self);
180 dvmCallMethod(self, gDvm.methDalvikDdmcServer_broadcast, NULL, &unused,
182 if (dvmCheckException(self)) {
183 ALOGI("Exception thrown by broadcast(%d)", event);
184 dvmLogExceptionStackTrace();
185 dvmClearException(self);
191 * First DDM packet has arrived over JDWP. Notify the press.
193 * We can do some initialization here too.
195 void dvmDdmConnected()
199 ALOGV("Broadcasting DDM connect");
200 broadcast(CONNECTED);
204 * JDWP connection has dropped.
208 void dvmDdmDisconnected()
210 ALOGV("Broadcasting DDM disconnect");
211 broadcast(DISCONNECTED);
213 gDvm.ddmThreadNotification = false;
218 * Turn thread notification on or off.
220 void dvmDdmSetThreadNotification(bool enable)
223 * We lock the thread list to avoid sending duplicate events or missing
224 * a thread change. We should be okay holding this lock while sending
225 * the messages out. (We have to hold it while accessing a live thread.)
227 dvmLockThreadList(NULL);
228 gDvm.ddmThreadNotification = enable;
232 for (thread = gDvm.threadList; thread != NULL; thread = thread->next) {
233 //ALOGW("notify %d", thread->threadId);
234 dvmDdmSendThreadNotification(thread, true);
238 dvmUnlockThreadList();
242 * Send a notification when a thread starts or stops.
244 * Because we broadcast the full set of threads when the notifications are
245 * first enabled, it's possible for "thread" to be actively executing.
247 void dvmDdmSendThreadNotification(Thread* thread, bool started)
249 if (!gDvm.ddmThreadNotification) {
253 StringObject* nameObj = NULL;
254 Object* threadObj = thread->threadObj;
256 if (threadObj != NULL) {
257 nameObj = (StringObject*)
258 dvmGetFieldObject(threadObj, gDvm.offJavaLangThread_name);
269 type = CHUNK_TYPE("THCR");
271 if (nameObj != NULL) {
272 stringLen = nameObj->length();
273 chars = nameObj->chars();
279 /* leave room for the two integer fields */
280 if (stringLen > (sizeof(buf) - sizeof(u4)*2) / 2) {
281 stringLen = (sizeof(buf) - sizeof(u4)*2) / 2;
283 len = stringLen*2 + sizeof(u4)*2;
285 set4BE(&buf[0x00], thread->threadId);
286 set4BE(&buf[0x04], stringLen);
288 /* copy the UTF-16 string, transforming to big-endian */
289 outChars = (u2*)(void*)&buf[0x08];
290 while (stringLen--) {
291 set2BE((u1*) (outChars++), *chars++);
294 type = CHUNK_TYPE("THDE");
298 set4BE(&buf[0x00], thread->threadId);
301 dvmDbgDdmSendChunk(type, len, buf);
305 * Send a notification when a thread's name changes.
307 void dvmDdmSendThreadNameChange(int threadId, StringObject* newName)
309 if (!gDvm.ddmThreadNotification) {
313 size_t stringLen = newName->length();
314 const u2* chars = newName->chars();
322 int bufLen = 4 + 4 + (stringLen * 2);
325 set4BE(&buf[0x00], threadId);
326 set4BE(&buf[0x04], stringLen);
327 u2* outChars = (u2*)(void*)&buf[0x08];
328 while (stringLen--) {
329 set2BE((u1*) (outChars++), *chars++);
332 dvmDbgDdmSendChunk(CHUNK_TYPE("THNM"), bufLen, buf);
336 * Generate the contents of a THST chunk. The data encompasses all known
341 * (1b) bytes per entry
343 * Then, for each thread:
351 * The length fields exist in anticipation of adding additional fields
352 * without wanting to break ddms or bump the full protocol version. I don't
353 * think it warrants full versioning. They might be extraneous and could
354 * be removed from a future version.
356 * Returns a new byte[] with the data inside, or NULL on failure. The
357 * caller must call dvmReleaseTrackedAlloc() on the array.
359 ArrayObject* dvmDdmGenerateThreadStats()
361 const int kHeaderLen = 4;
362 const int kBytesPerEntry = 18;
364 dvmLockThreadList(NULL);
368 for (thread = gDvm.threadList; thread != NULL; thread = thread->next)
372 * Create a temporary buffer. We can't perform heap allocation with
373 * the thread list lock held (could cause a GC). The output is small
374 * enough to sit on the stack.
376 int bufLen = kHeaderLen + threadCount * kBytesPerEntry;
380 set1(buf+0, kHeaderLen);
381 set1(buf+1, kBytesPerEntry);
382 set2BE(buf+2, (u2) threadCount);
385 for (thread = gDvm.threadList; thread != NULL; thread = thread->next) {
386 bool isDaemon = false;
388 ProcStatData procStatData;
389 if (!dvmGetThreadStats(&procStatData, thread->systemTid)) {
390 /* failed; show zero */
391 memset(&procStatData, 0, sizeof(procStatData));
394 Object* threadObj = thread->threadObj;
395 if (threadObj != NULL) {
396 isDaemon = dvmGetFieldBoolean(threadObj,
397 gDvm.offJavaLangThread_daemon);
400 set4BE(buf+0, thread->threadId);
401 set1(buf+4, thread->status);
402 set4BE(buf+5, thread->systemTid);
403 set4BE(buf+9, procStatData.utime);
404 set4BE(buf+13, procStatData.stime);
405 set1(buf+17, isDaemon);
407 buf += kBytesPerEntry;
409 dvmUnlockThreadList();
413 * Create a byte array to hold the data.
415 ArrayObject* arrayObj = dvmAllocPrimitiveArray('B', bufLen, ALLOC_DEFAULT);
416 if (arrayObj != NULL)
417 memcpy(arrayObj->contents, tmpBuf, bufLen);
423 * Find the specified thread and return its stack trace as an array of
424 * StackTraceElement objects.
426 ArrayObject* dvmDdmGetStackTraceById(u4 threadId)
428 Thread* self = dvmThreadSelf();
432 dvmLockThreadList(self);
434 for (thread = gDvm.threadList; thread != NULL; thread = thread->next) {
435 if (thread->threadId == threadId)
438 if (thread == NULL) {
439 ALOGI("dvmDdmGetStackTraceById: threadid=%d not found", threadId);
440 dvmUnlockThreadList();
445 * Suspend the thread, pull out the stack trace, then resume the thread
446 * and release the thread list lock. If we're being asked to examine
447 * our own stack trace, skip the suspend/resume.
451 dvmSuspendThread(thread);
452 traceBuf = dvmFillInStackTraceRaw(thread, &stackDepth);
454 dvmResumeThread(thread);
455 dvmUnlockThreadList();
458 * Convert the raw buffer into an array of StackTraceElement.
460 ArrayObject* trace = dvmGetStackTraceRaw(traceBuf, stackDepth);
466 * Gather up the allocation data and copy it into a byte[].
468 * Returns NULL on failure with an exception raised.
470 ArrayObject* dvmDdmGetRecentAllocations()
475 if (!dvmGenerateTrackedAllocationReport(&data, &len)) {
477 dvmThrowOutOfMemoryError("recent alloc native");
481 ArrayObject* arrayObj = dvmAllocPrimitiveArray('B', len, ALLOC_DEFAULT);
482 if (arrayObj != NULL)
483 memcpy(arrayObj->contents, data, len);