| /* |
| * 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/null_trace_writer.h" |
| |
| #include "perfetto/base/logging.h" |
| #include "perfetto/base/utils.h" |
| |
| #include "perfetto/protozero/message.h" |
| |
| #include "perfetto/trace/trace_packet.pbzero.h" |
| |
| namespace perfetto { |
| |
| NullTraceWriter::NullTraceWriter() |
| : delegate_(base::kPageSize), stream_(&delegate_) { |
| cur_packet_.reset(new protos::pbzero::TracePacket()); |
| cur_packet_->Finalize(); // To avoid the DCHECK in NewTracePacket(). |
| } |
| |
| NullTraceWriter::~NullTraceWriter() {} |
| |
| void NullTraceWriter::Flush(std::function<void()> callback) { |
| // Flush() cannot be called in the middle of a TracePacket. |
| PERFETTO_CHECK(cur_packet_->is_finalized()); |
| |
| if (callback) |
| callback(); |
| } |
| |
| NullTraceWriter::TracePacketHandle NullTraceWriter::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_); |
| return TraceWriter::TracePacketHandle(cur_packet_.get()); |
| } |
| |
| WriterID NullTraceWriter::writer_id() const { |
| return 0; |
| } |
| |
| } // namespace perfetto |