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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
45 lines
1.3 KiB
C++
45 lines
1.3 KiB
C++
//===- DerivedUser.h - Base for non-IR Users --------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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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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