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/*
* Copyright (c) 2020 Samsung Electronics Co., Ltd. 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 __ONERT_BACKEND_BUILTIN_BACKEND_H__
#define __ONERT_BACKEND_BUILTIN_BACKEND_H__
#include "BackendContext.h"
#include "Config.h"
#include "KernelGenerator.h"
#include "TensorBuilder.h"
#include "Tensor.h"
#include <backend/Backend.h>
#include <memory>
namespace onert
{
namespace backend
{
namespace builtin
{
class Backend : public ::onert::backend::Backend
{
public:
Backend() : _config{std::make_shared<Config>()} {}
std::shared_ptr<IConfig> config() const override { return _config; }
std::unique_ptr<onert::backend::BackendContext> newContext(ContextData &&data) const override
{
auto context = std::make_unique<BackendContext>(this, std::move(data));
// ControlFlow backend may not build tensors for itself because the backend's operation uses
// tensors of other baceknd instead
// But the backend builds tensors in case of that the controlflow operation may have constant
// input or that consecutive controflow operations exist. We have to make them not to be built
// later
// 1. Constant input
// These tensors cannot be dynamic tensor, so let's do it as follows:
// - always skip copying
// - if it is operation's input in child subgraph: register "use" as constant input of the
// operations in child subgraph
// - if it is child subgraph's output: register "use" as constant input of the operations
// using it
// 2. Consecutive controflow operation's intermediate tensor
// These tensors can be dynamic tensor and this is complicated to support without copying. But
// there is no such case until now, let's support it later
// TODO Remove TensorBuilder and ConstantInitializer
// TODO Support Consecutive controflow operation's intermediate tensor
auto tr = std::make_shared<TensorRegistry>();
auto tb = std::make_shared<TensorBuilder>(tr);
context->tensor_registry = tr;
context->tensor_builder = tb;
context->kernel_gen = std::make_shared<KernelGenerator>(
*context->graph(), tb->dynamicTensorManager(), tr, context->external_context());
return context;
}
private:
std::shared_ptr<IConfig> _config;
};
} // namespace builtin
} // namespace backend
} // namespace onert
#endif // __ONERT_BACKEND_BUILTIN_BACKEND_H__
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