2 * Copyright (c) 2020 Samsung Electronics Co., Ltd. All Rights Reserved
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #ifndef __ONERT_BACKEND_CONTROLFLOW_BACKEND_H__
18 #define __ONERT_BACKEND_CONTROLFLOW_BACKEND_H__
21 #include "ConstantInitializer.h"
22 #include "KernelGenerator.h"
23 #include "TensorBuilder.h"
25 #include <backend/Backend.h>
36 class Backend : public ::onert::backend::Backend
39 Backend() : _config{std::make_shared<Config>()} {}
41 std::shared_ptr<IConfig> config() const override { return _config; }
43 std::unique_ptr<BackendContext> newContext(const ir::Graph &graph,
44 const std::shared_ptr<custom::IKernelBuilder> &,
47 const auto &operands = graph.operands();
48 auto context = std::make_unique<BackendContext>(this, &graph);
49 // ControlFlow backend may not build tensors for itself because the backend's operation uses
50 // tensors of other baceknd instead
51 // But the backend builds tensors in case of that the controlflow operation may have constant
52 // input or that consecutive controflow operations exist. We have to make them not to be built
55 // These tensors cannot be dynamic tensor, so let's do it as follows:
56 // - always skip copying
57 // - if it is operation's input in child subgraph: register "use" as constant input of the
58 // operations in child subgraph
59 // - if it is child subgraph's output: register "use" as constant input of the operations
61 // 2. Consecutive controflow operation's intermediate tensor
62 // These tensors can be dynamic tensor and this is complicated to support without copying. But
63 // there is no such case until now, let's support it later
64 // TODO Remove TensorBuilder and ConstantInitializer
65 // TODO Support Consecutive controflow operation's intermediate tensor
66 auto tb = std::make_shared<TensorBuilder>();
67 context->tensor_builder = tb;
68 context->constant_initializer = std::make_shared<ConstantInitializer>(operands, tb);
69 context->kernel_gen = std::make_shared<KernelGenerator>(graph, tb);
70 context->tensor_register = nullptr;
71 context->optimizer = nullptr;
76 std::shared_ptr<IConfig> _config;
79 } // namespace controlflow
80 } // namespace backend
83 #endif // __ONERT_BACKEND_CONTROLFLOW_BACKEND_H__