llvm/llvm/include/llvm/IR/OperandTraits.h

//===-- llvm/OperandTraits.h - OperandTraits class definition ---*- 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
//
//===----------------------------------------------------------------------===//
//
// This file defines the traits classes that are handy for enforcing the correct
// layout of various User subclasses. It also provides the means for accessing
// the operands in the most efficient manner.
//

#ifndef LLVM_IR_OPERANDTRAITS_H
#define LLVM_IR_OPERANDTRAITS_H

#include "llvm/IR/User.h"

namespace llvm {

//===----------------------------------------------------------------------===//
//                          FixedNumOperand Trait Class
//===----------------------------------------------------------------------===//

/// FixedNumOperandTraits - determine the allocation regime of the Use array
/// when it is a prefix to the User object, and the number of Use objects is
/// known at compile time.

template <typename SubClass, unsigned ARITY>
struct FixedNumOperandTraits { … };

//===----------------------------------------------------------------------===//
//                          OptionalOperand Trait Class
//===----------------------------------------------------------------------===//

/// OptionalOperandTraits - when the number of operands may change at runtime.
/// Naturally it may only decrease, because the allocations may not change.

template <typename SubClass, unsigned ARITY = 1>
struct OptionalOperandTraits : public FixedNumOperandTraits<SubClass, ARITY> { … };

//===----------------------------------------------------------------------===//
//                          VariadicOperand Trait Class
//===----------------------------------------------------------------------===//

/// VariadicOperandTraits - determine the allocation regime of the Use array
/// when it is a prefix to the User object, and the number of Use objects is
/// only known at allocation time.

template <typename SubClass> struct VariadicOperandTraits { … };

//===----------------------------------------------------------------------===//
//                          HungoffOperand Trait Class
//===----------------------------------------------------------------------===//

/// HungoffOperandTraits - determine the allocation regime of the Use array
/// when it is not a prefix to the User object, but allocated at an unrelated
/// heap address.
///
/// This is the traits class that is needed when the Use array must be
/// resizable.

struct HungoffOperandTraits { … };

/// Macro for generating in-class operand accessor declarations.
/// It should only be called in the public section of the interface.
///
#define DECLARE_TRANSPARENT_OPERAND_ACCESSORS(VALUECLASS) …

/// Macro for generating out-of-class operand accessor definitions
#define DEFINE_TRANSPARENT_OPERAND_ACCESSORS(CLASS, VALUECLASS) …


} // End llvm namespace

#endif