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+/*
+ * Copyright (c) 2019 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 __TFL_EXPORTER_UTILS_H__
+#define __TFL_EXPORTER_UTILS_H__
+
+#include "ExporterUtils.h"
+
+#include "schema_generated.h"
+
+#include "Dialect/IR/TFLNodes.h"
+
+#include <loco.h>
+
+#include <unordered_map>
+
+namespace exo
+{
+namespace tflite_detail
+{
+
+struct OpCode
+{
+ tflite::BuiltinOperator opcode;
+
+ bool operator==(const OpCode &rhs) const { return opcode == rhs.opcode; }
+};
+
+} // namespace tflite_detail
+} // namespace exo
+
+namespace exo
+{
+
+tflite::ActivationFunctionType to_tflite_actfunc(locoex::FusedActFunc func);
+
+} // namespace exo
+
+namespace std
+{
+
+template <> struct hash<exo::tflite_detail::OpCode>
+{
+ size_t operator()(const exo::tflite_detail::OpCode &x) const { return hash<int>()(x.opcode); }
+};
+
+} // namespace std
+
+namespace exo
+{
+namespace tflite_detail
+{
+
+/**
+ * @breif Record the information of T/F Lite SubGraph and its mapping to loco
+ */
+struct SubGraphContext
+{
+ /// @brief SubGraph input tensor id
+ std::vector<int32_t> _inputs;
+ /// @brief SubGraph output tensor id
+ std::vector<int32_t> _outputs;
+};
+
+// Prerequisites for tflite::Model object creation
+struct SerializedModelData final : public SubGraphContext
+{
+ SerializedModelData() = default;
+ SerializedModelData(const SerializedModelData &) = delete;
+
+ std::unordered_map<OpCode, uint32_t> _operator_codes;
+ std::unordered_map<OpCode, std::string> _custom_operator_codes;
+ std::vector<flatbuffers::Offset<tflite::Operator>> _operators;
+ std::vector<flatbuffers::Offset<tflite::Tensor>> _tensors;
+ std::vector<flatbuffers::Offset<tflite::Buffer>> _buffers;
+
+ // Graph input and output names
+ std::unordered_map<loco::Pull *, std::string> _pull_to_name;
+ std::unordered_map<loco::Push *, std::string> _push_to_name;
+
+ /**
+ * @brief if opcode is not registered in table of opcodes add it
+ * @param builtin_code
+ * @return idx of opcode in table of opcodes (see schema)
+ */
+ uint32_t registerBuiltinOpcode(tflite::BuiltinOperator builtin_code);
+ uint32_t registerCustomOpcode(const std::string &custom_op);
+};
+
+tflite::Padding getOpPadding(const loco::Padding2D *pad, const loco::Stride<2> *stride,
+ const ShapeDescription &ifm, const ShapeDescription &ofm);
+tflite::Padding getOpPadding(const locoex::Padding pad);
+
+/// @brief Register graph input and output names to SerializedModelData
+void registerGraphIOName(loco::Graph *graph, SerializedModelData &gd);
+
+using TFLTensorIndex = int32_t;
+
+void set_tensor_index(loco::Node *node, const TFLTensorIndex &tensor_id);
+TFLTensorIndex get_tensor_index(loco::Node *node);
+
+} // namespace tflite_detail
+} // namespace exo
+
+#endif // __TFL_EXPORTER_UTILS_H__