1 files changed, 63 insertions, 0 deletions
diff --git a/compiler/coco/core/include/coco/IR/BlockIndex.h b/compiler/coco/core/include/coco/IR/BlockIndex.h
new file mode 100644
index 000000000..7deabf488
--- /dev/null
+++ b/compiler/coco/core/include/coco/IR/BlockIndex.h
@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 2018 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 __COCO_IR_BLOCK_INDEX_H__
+#define __COCO_IR_BLOCK_INDEX_H__
+
+#include <cstdint>
+
+namespace coco
+{
+
+/**
+ * @brief A BlockIndex denotes the index of a block in a block list
+ */
+class BlockIndex final
+{
+private:
+  static const uint32_t undefined = 0xffffffff;
+
+public:
+  BlockIndex() : _value{undefined}
+  {
+    // DO NOTHING
+  }
+
+public:
+  BlockIndex(uint32_t value) { set(value); }
+
+public:
+  bool valid(void) const { return _value != undefined; }
+
+public:
+  uint32_t value(void) const { return _value; }
+
+public:
+  void set(uint32_t value);
+  void reset(void) { _value = undefined; }
+
+private:
+  uint32_t _value;
+};
+
+static inline bool operator<(const BlockIndex &lhs, const BlockIndex &rhs)
+{
+  return lhs.value() < rhs.value();
+}
+
+} // namespace coco
+
+#endif // __COCO_IR_BLOCK_INDEX_H__