Initial Commit

thirdparty/capstone/suite/synctools/tablegen/include/llvm/IR/DerivedUser.h

@@ -0,0 +1,44 @@
+//===- DerivedUser.h - Base for non-IR Users --------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_IR_DERIVEDUSER_H
+#define LLVM_IR_DERIVEDUSER_H
+
+#include "llvm/IR/User.h"
+
+namespace llvm {
+
+class Type;
+class Use;
+
+/// Extension point for the Value hierarchy. All classes outside of lib/IR
+/// that wish to inherit from User should instead inherit from DerivedUser
+/// instead. Inheriting from this class is discouraged.
+///
+/// Generally speaking, Value is the base of a closed class hierarchy
+/// that can't be extended by code outside of lib/IR. This class creates a
+/// loophole that allows classes outside of lib/IR to extend User to leverage
+/// its use/def list machinery.
+class DerivedUser : public User {
+protected:
+  using  DeleteValueTy = void (*)(DerivedUser *);
+
+private:
+  friend class Value;
+
+  DeleteValueTy DeleteValue;
+
+public:
+  DerivedUser(Type *Ty, unsigned VK, Use *U, unsigned NumOps,
+              DeleteValueTy DeleteValue)
+      : User(Ty, VK, U, NumOps), DeleteValue(DeleteValue) {}
+};
+
+} // end namespace llvm
+
+#endif // LLVM_IR_DERIVEDUSER_H