/* Copyright 2017 The TensorFlow Authors. All Rights Reserved.

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 TENSORFLOW_COMPILER_XLA_SERVICE_HUMAN_READABLE_PROFILE_BUILDER_H_
#define TENSORFLOW_COMPILER_XLA_SERVICE_HUMAN_READABLE_PROFILE_BUILDER_H_

#include <vector>

#include "tensorflow/compiler/xla/types.h"
#include "tensorflow/core/lib/core/stringpiece.h"
#include "tensorflow/core/platform/logging.h"
#include "tensorflow/core/platform/types.h"

namespace xla {

// HumanReadableProfileBuilder helps you create a textual profile of a
// computation, suitable for consumption by humans.
class HumanReadableProfileBuilder {
 public:
  explicit HumanReadableProfileBuilder(tensorflow::StringPiece computation_name,
                                       int64 total_cycles,
                                       double clock_rate_ghz)
      : computation_name_(std::string(computation_name)),
        total_cycles_(total_cycles),
        clock_rate_ghz_(clock_rate_ghz) {
    CHECK_GE(clock_rate_ghz, 1e-9);
  }

  int64 total_cycles() const { return total_cycles_; }

  // Adds an operation to the profile.  If you don't know the number of
  // floating-point ops or bytes touched by the op, or if you don't know how
  // fast it would run optimally, pass -1 for that param.
  void AddOp(tensorflow::StringPiece op_name,
             tensorflow::StringPiece short_name,
             tensorflow::StringPiece category, int64 cycles, int64 flop_count,
             int64 transcendental_count, int64 bytes_accessed,
             float optimal_seconds) {
    op_infos_.push_back({std::string(op_name), std::string(short_name),
                         std::string(category), cycles, flop_count,
                         transcendental_count, bytes_accessed,
                         optimal_seconds});
  }

  // Gets the human-readable profile.
  string ToString() const;

 private:
  struct OpInfo {
    string name;
    string short_name;
    string category;
    int64 cycles;
    int64 flop_count;  // -1 if unknown
    int64 transcendental_count;
    int64 bytes_accessed;   // -1 if unknown
    float optimal_seconds;  // -1 if unknown
  };

  double CyclesToSeconds(int64 cycles) const {
    return cycles / clock_rate_ghz_ / 1e9;
  }
  double CyclesToMicroseconds(int64 cycles) const {
    return cycles / clock_rate_ghz_ / 1000.0;
  }

  string computation_name_;
  int64 total_cycles_;
  double clock_rate_ghz_;
  std::vector<OpInfo> op_infos_;
};

}  // namespace xla

#endif  // TENSORFLOW_COMPILER_XLA_SERVICE_HUMAN_READABLE_PROFILE_BUILDER_H_
