xref: /aosp_15_r20/external/perfetto/src/shared_lib/intern_map.cc (revision 6dbdd20afdafa5e3ca9b8809fa73465d530080dc)

/*
 * Copyright (C) 2023 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/shared_lib/intern_map.h"

namespace perfetto {
InternMap::InternMap() = default;

InternMap::~InternMap() = default;

InternMap::FindOrAssignRes InternMap::FindOrAssign(int32_t type,
                                                   const void* value,
                                                   size_t value_size) {
  // This would be more efficient with heterogeneous lookups, but C++17 doesn't
  // support that.
  auto* it = map_.Find(Key::NonOwning(type, value, value_size));
  if (it != nullptr) {
    return {*it, false};
  }
  uint64_t iid = ++last_iid_by_type_[type];
  it = map_.Insert(Key::Owning(type, value, value_size), iid).first;
  return {iid, true};
}

}  // namespace perfetto