1 /*
2 * Copyright (C) 2019 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 "perfetto/tracing/event_context.h"
18
19 #include "protos/perfetto/trace/interned_data/interned_data.pbzero.h"
20 #include "protos/perfetto/trace/track_event/track_event.pbzero.h"
21
22 namespace perfetto {
23
EventContext(EventContext::TracePacketHandle trace_packet,internal::TrackEventIncrementalState * incremental_state)24 EventContext::EventContext(
25 EventContext::TracePacketHandle trace_packet,
26 internal::TrackEventIncrementalState* incremental_state)
27 : trace_packet_(std::move(trace_packet)),
28 event_(trace_packet_->set_track_event()),
29 incremental_state_(incremental_state) {}
30
~EventContext()31 EventContext::~EventContext() {
32 if (!trace_packet_)
33 return;
34
35 // When the track event is finalized (i.e., the context is destroyed), we
36 // should flush any newly seen interned data to the trace. The data has
37 // earlier been written to a heap allocated protobuf message
38 // (|serialized_interned_data|). Here we just need to flush it to the main
39 // trace.
40 auto& serialized_interned_data = incremental_state_->serialized_interned_data;
41 if (PERFETTO_LIKELY(serialized_interned_data.empty()))
42 return;
43
44 auto ranges = serialized_interned_data.GetRanges();
45 trace_packet_->AppendScatteredBytes(
46 perfetto::protos::pbzero::TracePacket::kInternedDataFieldNumber,
47 &ranges[0], ranges.size());
48
49 // Reset the message but keep one buffer allocated for future use.
50 serialized_interned_data.Reset();
51 }
52
53 } // namespace perfetto
54