1 files changed, 89 insertions, 0 deletions
diff --git a/compiler/oops/include/oops/UserExn.h b/compiler/oops/include/oops/UserExn.h
new file mode 100644
index 000000000..d0138322d
--- /dev/null
+++ b/compiler/oops/include/oops/UserExn.h
@@ -0,0 +1,89 @@
+/*
+ * 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 __OOPS_USER_EXN_H__
+#define __OOPS_USER_EXN_H__
+
+#include <pepper/str.h>
+
+#include <exception>
+#include <string>
+#include <map>
+
+namespace oops
+{
+
+/**
+ * @brief Exception to user
+ *
+ * Pass msg and one additional info, e.g.,
+ *   ex) UserExn("Unsupported rank", 4);
+ *   ex) UserExn("Unsupported layout", "NHWC");
+ *
+ * Or pass msg with attribute pairs of name & val ,
+ *   ex) UserExn("Node has unsupported layout",
+ *                 "Node", node->name(),
+ *                 "layout", node->layout());
+ */
+class UserExn : public std::exception
+{
+public:
+  UserExn() = delete;
+
+  template <typename... Info> UserExn(const std::string &msg, Info &&... args)
+  {
+    std::stringstream out;
+
+    out << "Error: " << msg + ": ";
+
+    build_info(out, args...);
+
+    _msg = out.str();
+  }
+
+  const char *what() const noexcept override { return _msg.c_str(); };
+
+private:
+  template <typename Attr, typename Val, typename... AttsVals>
+  void build_info(std::stringstream &out, Attr &attr, Val &val, AttsVals &... args)
+  {
+    out << pepper::str(attr, " = ", val);
+    out << ", ";
+
+    build_info(out, args...);
+  }
+
+  template <typename Attr, typename Val>
+  void build_info(std::stringstream &out, Attr &attr, Val &val)
+  {
+    out << pepper::str(attr, " = ", val);
+  }
+
+  void build_info(std::stringstream &) { /* empty */}
+
+  // when only one info of string is provided
+  void build_info(std::stringstream &out, const std::string &val) { out << val; }
+
+  // when only one info of uint32_t is provided
+  void build_info(std::stringstream &out, const uint32_t &val) { out << val; }
+
+private:
+  std::string _msg;
+};
+
+} // namespace oops
+
+#endif // __OOPS_USER_EXN_H__