src/trace_processor/proto_trace_tokenizer.h

/*
 * 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.
 */

#ifndef SRC_TRACE_PROCESSOR_PROTO_TRACE_TOKENIZER_H_
#define SRC_TRACE_PROCESSOR_PROTO_TRACE_TOKENIZER_H_

#include <stdint.h>

#include <memory>
#include <vector>

#include "src/trace_processor/chunked_trace_reader.h"

namespace perfetto {
namespace trace_processor {

class TraceProcessorContext;
class TraceBlobView;
class TraceSorter;

// Reads a protobuf trace in chunks and extracts boundaries of trace packets
// (or subfields, for the case of ftrace) with their timestamps.
class ProtoTraceTokenizer : public ChunkedTraceReader {
 public:
  // |reader| is the abstract method of getting chunks of size |chunk_size_b|
  // from a trace file with these chunks parsed into |trace|.
  explicit ProtoTraceTokenizer(TraceProcessorContext*);
  ~ProtoTraceTokenizer() override;

  // ChunkedTraceReader implementation.
  bool Parse(std::unique_ptr<uint8_t[]>, size_t size) override;

 private:
  void ParseInternal(std::unique_ptr<uint8_t[]> owned_buf,
                     uint8_t* data,
                     size_t size);
  void ParsePacket(TraceBlobView);
  void ParseFtraceBundle(TraceBlobView);
  void ParseFtraceEvent(uint32_t cpu, TraceBlobView);

  TraceSorter* const trace_sorter_;

  // Used to glue together trace packets that span across two (or more)
  // Parse() boundaries.
  std::vector<uint8_t> partial_buf_;

  // Temporary. Currently trace packets do not have a timestamp, so the
  // timestamp given is last_timestamp.
  int64_t last_timestamp_ = 0;
};

}  // namespace trace_processor
}  // namespace perfetto

#endif  // SRC_TRACE_PROCESSOR_PROTO_TRACE_TOKENIZER_H_