1 files changed, 71 insertions, 0 deletions
diff --git a/compiler/loco/include/loco/IR/Use.h b/compiler/loco/include/loco/IR/Use.h
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+++ b/compiler/loco/include/loco/IR/Use.h
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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__