// This function is deprecated and replaced with android_lookupEventTag_len
// since it will cause the map to change from Shared and backed by a file,
// to Private Dirty and backed up by swap, albeit highly compressible. By
// deprecating this function everywhere, we save 100s of MB of memory space.
LIBLOG_ABI_PUBLIC const char* android_lookupEventTag(const EventTagMap* map,
unsigned int tag) {
size_t len;
const char* tagStr = android_lookupEventTag_len(map, &len, tag);
if (!tagStr) return tagStr;
char* cp = const_cast<char*>(tagStr);
cp += len;
if (*cp) *cp = '\0'; // Trigger copy on write :-( and why deprecated.
return tagStr;
}
/*
* Measure the time it takes for android_lookupEventTag_len
*/
static void BM_lookupEventTag(benchmark::State& state) {
prechargeEventMap();
std::unordered_set<uint32_t>::const_iterator it = set.begin();
while (state.KeepRunning()) {
size_t len;
android_lookupEventTag_len(map, &len, (*it));
++it;
if (it == set.end()) it = set.begin();
}
}
static void BM_lookupEventTag_NOT(benchmark::State& state) {
prechargeEventMap();
while (set.find(notTag) != set.end()) {
++notTag;
if (notTag >= USHRT_MAX) notTag = 1;
}
while (state.KeepRunning()) {
size_t len;
android_lookupEventTag_len(map, &len, notTag);
}
++notTag;
if (notTag >= USHRT_MAX) notTag = 1;
}
static bool prechargeEventMap() {
if (map) return true;
fprintf(stderr, "Precharge: start\n");
map = android_openEventTagMap(NULL);
for (uint32_t tag = 1; tag < USHRT_MAX; ++tag) {
size_t len;
if (android_lookupEventTag_len(map, &len, tag) == NULL) continue;
set.insert(tag);
}
fprintf(stderr, "Precharge: stop %zu\n", set.size());
return true;
}
/*
* Measure the time it takes for android_lookupEventTagNum plus above
*/
static void BM_lookupEventTagNum(benchmark::State& state) {
prechargeEventMap();
std::unordered_set<uint32_t>::const_iterator it = set.begin();
while (state.KeepRunning()) {
size_t len;
const char* name = android_lookupEventTag_len(map, &len, (*it));
std::string Name(name, len);
const char* format = android_lookupEventFormat_len(map, &len, (*it));
std::string Format(format, len);
state.ResumeTiming();
android_lookupEventTagNum(map, Name.c_str(), Format.c_str(),
ANDROID_LOG_UNKNOWN);
state.PauseTiming();
++it;
if (it == set.end()) it = set.begin();
}
}
static void BM_lookupEventTagNum_logd_existing(benchmark::State& state) {
prechargeEventMap();
std::unordered_set<uint32_t>::const_iterator it = set.begin();
while (state.KeepRunning()) {
size_t len;
const char* name = android_lookupEventTag_len(map, &len, (*it));
std::string Name(name, len);
const char* format = android_lookupEventFormat_len(map, &len, (*it));
std::string Format(format, len);
char buffer[256];
snprintf(buffer, sizeof(buffer), "getEventTag name=%s format=\"%s\"",
Name.c_str(), Format.c_str());
state.ResumeTiming();
send_to_control(buffer, sizeof(buffer));
state.PauseTiming();
++it;
if (it == set.end()) it = set.begin();
}
}
/**
* Convert a binary log entry to ASCII form.
*
* For convenience we mimic the processLogBuffer API. There is no
* pre-defined output length for the binary data, since we're free to format
* it however we choose, which means we can't really use a fixed-size buffer
* here.
*/
LIBLOG_ABI_PUBLIC int android_log_processBinaryLogBuffer(
struct logger_entry *buf,
AndroidLogEntry *entry,
const EventTagMap *map,
char *messageBuf, int messageBufLen)
{
size_t inCount;
unsigned int tagIndex;
const unsigned char* eventData;
entry->tv_sec = buf->sec;
entry->tv_nsec = buf->nsec;
entry->priority = ANDROID_LOG_INFO;
entry->uid = -1;
entry->pid = buf->pid;
entry->tid = buf->tid;
/*
* Pull the tag out, fill in some additional details based on incoming
* buffer version (v3 adds lid, v4 adds uid).
*/
eventData = (const unsigned char*) buf->msg;
struct logger_entry_v2 *buf2 = (struct logger_entry_v2 *)buf;
if (buf2->hdr_size) {
if ((buf2->hdr_size < sizeof(((struct log_msg *)NULL)->entry_v1)) ||
(buf2->hdr_size > sizeof(((struct log_msg *)NULL)->entry))) {
fprintf(stderr, "+++ LOG: entry illegal hdr_size\n");
return -1;
}
eventData = ((unsigned char *)buf2) + buf2->hdr_size;
if ((buf2->hdr_size >= sizeof(struct logger_entry_v3)) &&
(((struct logger_entry_v3 *)buf)->lid == LOG_ID_SECURITY)) {
entry->priority = ANDROID_LOG_WARN;
}
if (buf2->hdr_size >= sizeof(struct logger_entry_v4)) {
entry->uid = ((struct logger_entry_v4 *)buf)->uid;
}
}
inCount = buf->len;
if (inCount < 4)
return -1;
tagIndex = get4LE(eventData);
eventData += 4;
inCount -= 4;
entry->tagLen = 0;
if (map != NULL) {
entry->tag = android_lookupEventTag_len(map, &entry->tagLen, tagIndex);
} else {
entry->tag = NULL;
}
/*
* If we don't have a map, or didn't find the tag number in the map,
* stuff a generated tag value into the start of the output buffer and
* shift the buffer pointers down.
*/
if (entry->tag == NULL) {
size_t tagLen;
tagLen = snprintf(messageBuf, messageBufLen, "[%d]", tagIndex);
if (tagLen >= (size_t)messageBufLen) {
tagLen = messageBufLen - 1;
}
entry->tag = messageBuf;
entry->tagLen = tagLen;
messageBuf += tagLen + 1;
messageBufLen -= tagLen + 1;
}
/*
* Format the event log data into the buffer.
*/
char* outBuf = messageBuf;
size_t outRemaining = messageBufLen-1; /* leave one for nul byte */
int result;
result = android_log_printBinaryEvent(&eventData, &inCount, &outBuf,
&outRemaining);
if (result < 0) {
fprintf(stderr, "Binary log entry conversion failed\n");
return -1;
} else if (result == 1) {
if (outBuf > messageBuf) {
/* leave an indicator */
*(outBuf-1) = '!';
} else {
/* no room to output anything at all */
*outBuf++ = '!';
outRemaining--;
}
/* pretend we ate all the data */
inCount = 0;
}
/* eat the silly terminating '\n' */
if (inCount == 1 && *eventData == '\n') {
eventData++;
inCount--;
}
if (inCount != 0) {
fprintf(stderr,
"Warning: leftover binary log data (%zu bytes)\n", inCount);
}
/*
* Terminate the buffer. The NUL byte does not count as part of
* entry->messageLen.
*/
*outBuf = '\0';
entry->messageLen = outBuf - messageBuf;
assert(entry->messageLen == (messageBufLen-1) - outRemaining);
entry->message = messageBuf;
return 0;
}
