| //===- DerivedUser.h - Base for non-IR Users --------------------*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #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 |