/*
 * 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.
 */

#ifndef SRC_TRACE_PROCESSOR_IMPORTERS_COMMON_STACK_PROFILE_TRACKER_H_
#define SRC_TRACE_PROCESSOR_IMPORTERS_COMMON_STACK_PROFILE_TRACKER_H_

#include <cstddef>
#include <cstdint>
#include <optional>

#include "perfetto/ext/base/flat_hash_map.h"
#include "perfetto/ext/base/murmur_hash.h"
#include "src/trace_processor/storage/trace_storage.h"
#include "src/trace_processor/tables/profiler_tables_py.h"

namespace perfetto::trace_processor {

class TraceProcessorContext;

class StackProfileTracker {
 public:
  explicit StackProfileTracker(TraceProcessorContext* context)
      : context_(context) {}

  CallsiteId InternCallsite(std::optional<CallsiteId> parent_callsite_id,
                            FrameId frame_id,
                            uint32_t depth);

 private:
  struct Hasher {
    size_t operator()(const tables::StackProfileCallsiteTable::Row& r) const {
      return base::MurmurHashCombine(r.depth, r.parent_id, r.frame_id);
    }
  };
  TraceProcessorContext* const context_;
  base::FlatHashMap<tables::StackProfileCallsiteTable::Row, CallsiteId, Hasher>
      callsite_unique_row_index_;
};

}  // namespace perfetto::trace_processor

#endif  // SRC_TRACE_PROCESSOR_IMPORTERS_COMMON_STACK_PROFILE_TRACKER_H_
