llvm/llvm/include/llvm/MC/MCInstrDesc.h

//===-- llvm/MC/MCInstrDesc.h - Instruction Descriptors -*- 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 MCOperandInfo and MCInstrDesc classes, which
// are used to describe target instructions and their operands.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_MC_MCINSTRDESC_H
#define LLVM_MC_MCINSTRDESC_H

#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/iterator_range.h"
#include "llvm/MC/MCRegister.h"

namespace llvm {
class MCRegisterInfo;

class MCInst;

//===----------------------------------------------------------------------===//
// Machine Operand Flags and Description
//===----------------------------------------------------------------------===//

namespace MCOI {
/// Operand constraints. These are encoded in 16 bits with one of the
/// low-order 3 bits specifying that a constraint is present and the
/// corresponding high-order hex digit specifying the constraint value.
/// This allows for a maximum of 3 constraints.
enum OperandConstraint { … };

// Define a macro to produce each constraint value.
#define MCOI_TIED_TO(op) …

#define MCOI_EARLY_CLOBBER …

/// These are flags set on operands, but should be considered
/// private, all access should go through the MCOperandInfo accessors.
/// See the accessors for a description of what these are.
enum OperandFlags { … };

/// Operands are tagged with one of the values of this enum.
enum OperandType { … };

} // namespace MCOI

/// This holds information about one operand of a machine instruction,
/// indicating the register class for register operands, etc.
class MCOperandInfo { … };

//===----------------------------------------------------------------------===//
// Machine Instruction Flags and Description
//===----------------------------------------------------------------------===//

namespace MCID {
/// These should be considered private to the implementation of the
/// MCInstrDesc class.  Clients should use the predicate methods on MCInstrDesc,
/// not use these directly.  These all correspond to bitfields in the
/// MCInstrDesc::Flags field.
enum Flag { … };
} // namespace MCID

/// Describe properties that are true of each instruction in the target
/// description file.  This captures information about side effects, register
/// use and many other things.  There is one instance of this struct for each
/// target instruction class, and the MachineInstr class points to this struct
/// directly to describe itself.
class MCInstrDesc { … };

} // end namespace llvm

#endif