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 #pragma once
18 
19 #include <utils/Errors.h>
20 #include <utils/Singleton.h>
21 
22 #include <cstdint>
23 #include <string_view>
24 
25 namespace android {
26 
27 class EventLog : public Singleton<EventLog> {
28 
29 public:
30     static void logFrameDurations(const std::string_view& name, const int32_t* durations,
31                                   size_t numDurations);
32 
33 protected:
34     EventLog();
35 
36 private:
37     /*
38      * EventLogBuffer is a helper class to construct an in-memory event log
39      * tag. In this version the buffer is not dynamic, so write operation can
40      * fail if there is not enough space in the temporary buffer.
41      * Once constructed, the buffer can be logger by calling the log()
42      * method.
43      */
44 
45     class TagBuffer {
46         enum { STORAGE_MAX_SIZE = 128 };
47         int32_t mPos;
48         int32_t mTag;
49         bool mOverflow;
50         char mStorage[STORAGE_MAX_SIZE];
51     public:
52         explicit TagBuffer(int32_t tag);
53 
54         void startList(int8_t count);
55         void endList();
56 
57         void writeInt32(int32_t);
58         void writeInt64(int64_t);
59         void writeString(const std::string_view&);
60 
61         void log();
62     };
63 
64     friend class Singleton<EventLog>;
65     EventLog(const EventLog&);
66     EventLog& operator =(const EventLog&);
67 
68     enum { LOGTAG_SF_FRAME_DUR = 60100 };
69     void doLogFrameDurations(const std::string_view& name, const int32_t* durations,
70                              size_t numDurations);
71 };
72 
73 } // namespace android
74