third_party/perfetto/src/tracing/data_source.cc

/*
 * Copyright (C) 2019 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 "perfetto/tracing/data_source.h"
#include "perfetto/base/logging.h"

namespace perfetto {

DataSourceBase::StopArgs::~StopArgs() = default;
DataSourceBase::FlushArgs::~FlushArgs() = default;
DataSourceBase::~DataSourceBase() = default;
void DataSourceBase::OnSetup(const SetupArgs&) {}
void DataSourceBase::OnStart(const StartArgs&) {}
void DataSourceBase::OnStop(const StopArgs&) {}
void DataSourceBase::WillClearIncrementalState(
    const ClearIncrementalStateArgs&) {}
void DataSourceBase::OnFlush(const FlushArgs&) {}

namespace internal {

void DataSourceType::PopulateTlsInst(
    DataSourceInstanceThreadLocalState* tls_inst,
    DataSourceState* instance_state,
    uint32_t instance_index) {
  auto* tracing_impl = TracingMuxer::Get();
  tls_inst->muxer_id_for_testing = instance_state->muxer_id_for_testing;
  tls_inst->backend_id = instance_state->backend_id;
  tls_inst->backend_connection_id = instance_state->backend_connection_id;
  tls_inst->buffer_id = instance_state->buffer_id;
  tls_inst->startup_target_buffer_reservation =
      instance_state->startup_target_buffer_reservation.load(
          std::memory_order_relaxed);
  tls_inst->data_source_instance_id = instance_state->data_source_instance_id;
  tls_inst->is_intercepted = instance_state->interceptor_id != 0;
  tls_inst->trace_writer = tracing_impl->CreateTraceWriter(
      &state_, instance_index, instance_state, buffer_exhausted_policy_);
  if (create_incremental_state_fn_) {
    PERFETTO_DCHECK(!tls_inst->incremental_state);
    CreateIncrementalState(tls_inst, instance_index);
  }
  if (create_custom_tls_fn_) {
    tls_inst->data_source_custom_tls =
        create_custom_tls_fn_(tls_inst, instance_index, user_arg_);
  }
  // Even in the case of out-of-IDs, SharedMemoryArbiterImpl returns a
  // NullTraceWriter. The returned pointer should never be null.
  PERFETTO_DCHECK(tls_inst->trace_writer);
}

}  // namespace internal
}  // namespace perfetto