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46 lines
1.3 KiB
C++
46 lines
1.3 KiB
C++
//===- DerivedUser.h - Base for non-IR Users --------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_IR_DERIVEDUSER_H
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#define LLVM_IR_DERIVEDUSER_H
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#include "llvm/IR/User.h"
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namespace llvm {
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class Type;
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class Use;
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/// Extension point for the Value hierarchy. All classes outside of lib/IR
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/// that wish to inherit from User should instead inherit from DerivedUser
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/// instead. Inheriting from this class is discouraged.
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///
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/// Generally speaking, Value is the base of a closed class hierarchy
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/// that can't be extended by code outside of lib/IR. This class creates a
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/// loophole that allows classes outside of lib/IR to extend User to leverage
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/// its use/def list machinery.
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class DerivedUser : public User {
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protected:
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using DeleteValueTy = void (*)(DerivedUser *);
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private:
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friend class Value;
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DeleteValueTy DeleteValue;
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public:
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DerivedUser(Type *Ty, unsigned VK, Use *U, unsigned NumOps,
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DeleteValueTy DeleteValue)
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: User(Ty, VK, U, NumOps), DeleteValue(DeleteValue) {}
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};
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} // end namespace llvm
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#endif // LLVM_IR_DERIVEDUSER_H
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