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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 __LOCO_IR_USE_H__
#define __LOCO_IR_USE_H__
#include "loco/IR/Node.forward.h"
namespace loco
{
/**
* @brief The edge between a node definition and its user.
*
* Note that this "Use" denotes **one** edge between a node and its users,
* and thus there are unique node and user for each Use.
*
* There will be multiple "Use" edges for the same node if there are multiple
* users.
*
* This class design is heavily inspired from "Use" class in LLVM.
*/
class Use final
{
public:
/**
* @brief Construct Use with its user
* @note user SHOULD BE set on construction.
*/
Use(Node *user) : _user{user}
{
// DO NOTHING
}
Use(const Use &) = delete;
Use(Use &&) = delete;
~Use()
{
// Unlink itself from the node
node(nullptr);
}
public:
Node *node(void) const { return _node; }
void node(Node *node);
public:
Node *user(void) const { return _user; }
private:
Node *_node{nullptr};
Node *_user{nullptr};
};
} // namespace loco
#endif // __LOCO_IR_USE_H__
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