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      1 /*
      2  * Copyright 2013 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 #include <stdio.h>
     18 #include <stdlib.h>
     19 #include <cutils/log.h>
     20 #include <utils/String8.h>
     21 
     22 #include "EventLog.h"
     23 
     24 // ---------------------------------------------------------------------------
     25 namespace android {
     26 // ---------------------------------------------------------------------------
     27 
     28 ANDROID_SINGLETON_STATIC_INSTANCE(EventLog)
     29 
     30 
     31 EventLog::EventLog() {
     32 }
     33 
     34 void EventLog::doLogFrameDurations(const String8& window,
     35         const int32_t* durations, size_t numDurations) {
     36     EventLog::TagBuffer buffer(LOGTAG_SF_FRAME_DUR);
     37     buffer.startList(1 + numDurations);
     38     buffer.writeString8(window);
     39     for (size_t i = 0; i < numDurations; i++) {
     40         buffer.writeInt32(durations[i]);
     41     }
     42     buffer.endList();
     43     buffer.log();
     44 }
     45 
     46 void EventLog::logFrameDurations(const String8& window,
     47         const int32_t* durations, size_t numDurations) {
     48     EventLog::getInstance().doLogFrameDurations(window, durations,
     49             numDurations);
     50 }
     51 
     52 // ---------------------------------------------------------------------------
     53 
     54 EventLog::TagBuffer::TagBuffer(int32_t tag)
     55     : mPos(0), mTag(tag), mOverflow(false) {
     56 }
     57 
     58 void EventLog::TagBuffer::log() {
     59     if (mOverflow) {
     60         ALOGW("couldn't log to binary event log: overflow.");
     61     } else if (android_bWriteLog(mTag, mStorage, mPos) < 0) {
     62         ALOGE("couldn't log to EventLog: %s", strerror(errno));
     63     }
     64     // purge the buffer
     65     mPos = 0;
     66     mOverflow = false;
     67 }
     68 
     69 void EventLog::TagBuffer::startList(int8_t count) {
     70     if (mOverflow) return;
     71     const size_t needed = 1 + sizeof(count);
     72     if (mPos + needed > STORAGE_MAX_SIZE) {
     73         mOverflow = true;
     74         return;
     75     }
     76     mStorage[mPos + 0] = EVENT_TYPE_LIST;
     77     mStorage[mPos + 1] = count;
     78     mPos += needed;
     79 }
     80 
     81 void EventLog::TagBuffer::endList() {
     82     if (mOverflow) return;
     83     const size_t needed = 1;
     84     if (mPos + needed > STORAGE_MAX_SIZE) {
     85         mOverflow = true;
     86         return;
     87     }
     88     mStorage[mPos + 0] = '\n';
     89     mPos += needed;
     90 }
     91 
     92 void EventLog::TagBuffer::writeInt32(int32_t value) {
     93     if (mOverflow) return;
     94     const size_t needed = 1 + sizeof(value);
     95     if (mPos + needed > STORAGE_MAX_SIZE) {
     96         mOverflow = true;
     97         return;
     98     }
     99     mStorage[mPos + 0] = EVENT_TYPE_INT;
    100     memcpy(&mStorage[mPos + 1], &value, sizeof(value));
    101     mPos += needed;
    102 }
    103 
    104 void EventLog::TagBuffer::writeInt64(int64_t value) {
    105     if (mOverflow) return;
    106     const size_t needed = 1 + sizeof(value);
    107     if (mPos + needed > STORAGE_MAX_SIZE) {
    108         mOverflow = true;
    109         return;
    110     }
    111     mStorage[mPos + 0] = EVENT_TYPE_LONG;
    112     memcpy(&mStorage[mPos + 1], &value, sizeof(value));
    113     mPos += needed;
    114 }
    115 
    116 void EventLog::TagBuffer::writeString8(const String8& value) {
    117     if (mOverflow) return;
    118     const int32_t stringLen = value.length();
    119     const size_t needed = 1 + sizeof(int32_t) + stringLen;
    120     if (mPos + needed > STORAGE_MAX_SIZE) {
    121         mOverflow = true;
    122         return;
    123     }
    124     mStorage[mPos + 0] = EVENT_TYPE_STRING;
    125     memcpy(&mStorage[mPos + 1], &stringLen, sizeof(int32_t));
    126     memcpy(&mStorage[mPos + 5], value.string(), stringLen);
    127     mPos += needed;
    128 }
    129 
    130 // ---------------------------------------------------------------------------
    131 }// namespace android
    132 
    133 // ---------------------------------------------------------------------------
    134