1 /*
2 * Copyright (C) 2017 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/ext/tracing/core/trace_packet.h"
18
19 #include "perfetto/base/logging.h"
20 #include "perfetto/protozero/proto_utils.h"
21
22 namespace perfetto {
23
24 TracePacket::TracePacket() = default;
25 TracePacket::~TracePacket() = default;
26
TracePacket(TracePacket && other)27 TracePacket::TracePacket(TracePacket&& other) noexcept {
28 *this = std::move(other);
29 }
30
operator =(TracePacket && other)31 TracePacket& TracePacket::operator=(TracePacket&& other) {
32 slices_ = std::move(other.slices_);
33 other.slices_.clear();
34 size_ = other.size_;
35 other.size_ = 0;
36 buffer_index_for_stats_ = other.buffer_index_for_stats_;
37 other.buffer_index_for_stats_ = 0;
38 return *this;
39 }
40
AddSlice(Slice slice)41 void TracePacket::AddSlice(Slice slice) {
42 size_ += slice.size;
43 slices_.push_back(std::move(slice));
44 }
45
AddSlice(const void * start,size_t size)46 void TracePacket::AddSlice(const void* start, size_t size) {
47 size_ += size;
48 slices_.emplace_back(start, size);
49 }
50
GetProtoPreamble()51 std::tuple<char*, size_t> TracePacket::GetProtoPreamble() {
52 using protozero::proto_utils::MakeTagLengthDelimited;
53 using protozero::proto_utils::WriteVarInt;
54 uint8_t* ptr = reinterpret_cast<uint8_t*>(&preamble_[0]);
55
56 constexpr uint8_t tag = MakeTagLengthDelimited(kPacketFieldNumber);
57 static_assert(tag < 0x80, "TracePacket tag should fit in one byte");
58 *(ptr++) = tag;
59
60 ptr = WriteVarInt(size(), ptr);
61 size_t preamble_size = reinterpret_cast<uintptr_t>(ptr) -
62 reinterpret_cast<uintptr_t>(&preamble_[0]);
63 PERFETTO_DCHECK(preamble_size <= sizeof(preamble_));
64 return std::make_tuple(&preamble_[0], preamble_size);
65 }
66
GetRawBytesForTesting()67 std::string TracePacket::GetRawBytesForTesting() {
68 std::string data;
69 data.resize(size());
70 size_t pos = 0;
71 for (const Slice& slice : slices()) {
72 PERFETTO_CHECK(pos + slice.size <= data.size());
73 memcpy(&data[pos], slice.start, slice.size);
74 pos += slice.size;
75 }
76 return data;
77 }
78
79 } // namespace perfetto
80