| /* |
| * Copyright (C) 2020 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. |
| */ |
| |
| #ifndef INCLUDE_PERFETTO_TRACING_INTERNAL_INTERCEPTOR_TRACE_WRITER_H_ |
| #define INCLUDE_PERFETTO_TRACING_INTERNAL_INTERCEPTOR_TRACE_WRITER_H_ |
| |
| #include "perfetto/protozero/scattered_heap_buffer.h" |
| #include "perfetto/tracing/interceptor.h" |
| #include "perfetto/tracing/internal/basic_types.h" |
| #include "perfetto/tracing/trace_writer_base.h" |
| #include "protos/perfetto/trace/trace_packet.pbzero.h" |
| |
| namespace perfetto { |
| namespace internal { |
| |
| // A heap-backed trace writer used to reroute trace packets to an interceptor. |
| class InterceptorTraceWriter : public TraceWriterBase { |
| public: |
| InterceptorTraceWriter(std::unique_ptr<InterceptorBase::ThreadLocalState> tls, |
| InterceptorBase::TracePacketCallback packet_callback, |
| DataSourceStaticState* static_state, |
| uint32_t instance_index); |
| ~InterceptorTraceWriter() override; |
| |
| // TraceWriterBase implementation. |
| protozero::MessageHandle<protos::pbzero::TracePacket> NewTracePacket() |
| override; |
| void Flush(std::function<void()> callback = {}) override; |
| uint64_t written() const override; |
| |
| private: |
| std::unique_ptr<InterceptorBase::ThreadLocalState> tls_; |
| InterceptorBase::TracePacketCallback packet_callback_; |
| |
| protozero::HeapBuffered<protos::pbzero::TracePacket> cur_packet_; |
| uint64_t bytes_written_ = 0; |
| |
| // Static state of the data source we are intercepting. |
| DataSourceStaticState* const static_state_; |
| |
| // Index of the data source tracing session which we are intercepting |
| // (0...kMaxDataSourceInstances - 1). Used to look up this interceptor's |
| // session state (i.e., the Interceptor class instance) in the |
| // DataSourceStaticState::instances array. |
| const uint32_t instance_index_; |
| |
| const uint32_t sequence_id_; |
| |
| static std::atomic<uint32_t> next_sequence_id_; |
| }; |
| |
| } // namespace internal |
| } // namespace perfetto |
| |
| #endif // INCLUDE_PERFETTO_TRACING_INTERNAL_INTERCEPTOR_TRACE_WRITER_H_ |