// Copyright (c) 2019 PaddlePaddle 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.

#include "paddle/fluid/lite/core/op_registry.h"
#include "paddle/fluid/lite/core/type_system.h"

namespace paddle {
namespace lite {
namespace kernels {
namespace host {

class FetchCompute
    : public KernelLite<TARGET(kHost), PRECISION(kAny), DATALAYOUT(kAny)> {
 public:
  using param_t = operators::FeedParam;

  void Run() override {
    auto& param = Param<operators::FetchParam>();
    auto* fetch_list = param.fetch_list;
    if (fetch_list->size() <= static_cast<size_t>(param.col)) {
      fetch_list->resize(param.col + 1);
    }

    auto& dst = fetch_list->at(param.col);
    dst.ShareDataWith(*param.input);
  }
};

}  // namespace host
}  // namespace kernels
}  // namespace lite
}  // namespace paddle

REGISTER_LITE_KERNEL(fetch, kHost, kAny, kAny,
                     paddle::lite::kernels::host::FetchCompute, def)
    .BindInput("X", {paddle::lite::Type::Get<paddle::lite::TensorAnyTy>(
                        TARGET(kHost))})
    .BindOutput("Out", {paddle::lite::Type::Get<paddle::lite::TensorListAnyTy>(
                           TARGET(kHost))})
    .Finalize();