| /* |
| * Copyright (C) 2018 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "src/tracing/core/trace_writer_for_testing.h" |
| |
| #include "perfetto/base/logging.h" |
| #include "perfetto/ext/base/utils.h" |
| #include "perfetto/protozero/message.h" |
| #include "protos/perfetto/trace/trace.pbzero.h" |
| #include "protos/perfetto/trace/trace_packet.pbzero.h" |
| |
| namespace perfetto { |
| |
| TraceWriterForTesting::TraceWriterForTesting() |
| : delegate_(static_cast<size_t>(base::kPageSize), |
| static_cast<size_t>(base::kPageSize)), |
| stream_(&delegate_) { |
| delegate_.set_writer(&stream_); |
| cur_packet_.reset(new protos::pbzero::TracePacket()); |
| cur_packet_->Finalize(); // To avoid the DCHECK in NewTracePacket(). |
| } |
| |
| TraceWriterForTesting::~TraceWriterForTesting() {} |
| |
| void TraceWriterForTesting::Flush(std::function<void()> callback) { |
| // Flush() cannot be called in the middle of a TracePacket. |
| PERFETTO_CHECK(cur_packet_->is_finalized()); |
| |
| if (callback) |
| callback(); |
| } |
| |
| std::vector<protos::gen::TracePacket> |
| TraceWriterForTesting::GetAllTracePackets() { |
| PERFETTO_CHECK(cur_packet_->is_finalized()); |
| |
| std::vector<uint8_t> buffer = delegate_.StitchSlices(); |
| protozero::ProtoDecoder trace(buffer.data(), buffer.size()); |
| std::vector<protos::gen::TracePacket> ret; |
| for (auto fld = trace.ReadField(); fld.valid(); fld = trace.ReadField()) { |
| PERFETTO_CHECK(fld.id() == protos::pbzero::Trace::kPacketFieldNumber); |
| protos::gen::TracePacket packet; |
| packet.ParseFromArray(fld.data(), fld.size()); |
| ret.emplace_back(std::move(packet)); |
| } |
| PERFETTO_CHECK(trace.bytes_left() == 0); |
| return ret; |
| } |
| |
| protos::gen::TracePacket TraceWriterForTesting::GetOnlyTracePacket() { |
| auto packets = GetAllTracePackets(); |
| PERFETTO_CHECK(packets.size() == 1); |
| return packets[0]; |
| } |
| |
| TraceWriterForTesting::TracePacketHandle |
| TraceWriterForTesting::NewTracePacket() { |
| // If we hit this, the caller is calling NewTracePacket() without having |
| // finalized the previous packet. |
| PERFETTO_DCHECK(cur_packet_->is_finalized()); |
| cur_packet_->Reset(&stream_); |
| |
| // Instead of storing the contents of the TracePacket directly in the backing |
| // buffer like the real trace writers, we prepend the proto preamble to make |
| // the buffer contents parsable as a sequence of TracePacket protos. |
| |
| uint8_t data[protozero::proto_utils::kMaxTagEncodedSize]; |
| uint8_t* data_end = protozero::proto_utils::WriteVarInt( |
| protozero::proto_utils::MakeTagLengthDelimited( |
| protos::pbzero::Trace::kPacketFieldNumber), |
| data); |
| stream_.WriteBytes(data, static_cast<uint32_t>(data_end - data)); |
| |
| auto packet = TraceWriter::TracePacketHandle(cur_packet_.get()); |
| packet->set_size_field( |
| stream_.ReserveBytes(protozero::proto_utils::kMessageLengthFieldSize)); |
| return packet; |
| } |
| |
| WriterID TraceWriterForTesting::writer_id() const { |
| return 0; |
| } |
| |
| uint64_t TraceWriterForTesting::written() const { |
| return 0; |
| } |
| |
| } // namespace perfetto |