MachineInstrBuilder.h | Explore in Territory

//===- CodeGen/MachineInstrBuilder.h - Simplify creation of MIs --*- 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 exposes a function named BuildMI, which is useful for dramatically
// simplifying how MachineInstr's are created.  It allows use of code like this:
//
//   MIMetadata MIMD(MI);  // Propagates DebugLoc and other metadata
//   M = BuildMI(MBB, MI, MIMD, TII.get(X86::ADD8rr), Dst)
//           .addReg(argVal1)
//           .addReg(argVal2);
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_CODEGEN_MACHINEINSTRBUILDER_H
#define LLVM_CODEGEN_MACHINEINSTRBUILDER_H

#include "llvm/ADT/ArrayRef.h"
#include "llvm/CodeGen/GlobalISel/Utils.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineInstrBundle.h"
#include "llvm/CodeGen/MachineOperand.h"
#include "llvm/CodeGen/TargetRegisterInfo.h"
#include "llvm/IR/InstrTypes.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/Support/ErrorHandling.h"
#include <cassert>
#include <cstdint>

namespace llvm {

class MCInstrDesc;
class MDNode;

namespace RegState {

// Keep this in sync with the table in MIRLangRef.rst.
enum { … };

} // end namespace RegState

class MachineInstrBuilder { … };

/// Set of metadata that should be preserved when using BuildMI(). This provides
/// a more convenient way of preserving DebugLoc, PCSections and MMRA.
class MIMetadata { … };

/// Builder interface. Specify how to create the initial instruction itself.
inline MachineInstrBuilder BuildMI(MachineFunction &MF, const MIMetadata &MIMD,
                                   const MCInstrDesc &MCID) { … }

/// This version of the builder sets up the first operand as a
/// destination virtual register.
inline MachineInstrBuilder BuildMI(MachineFunction &MF, const MIMetadata &MIMD,
                                   const MCInstrDesc &MCID, Register DestReg) { … }

/// This version of the builder inserts the newly-built instruction before
/// the given position in the given MachineBasicBlock, and sets up the first
/// operand as a destination virtual register.
inline MachineInstrBuilder BuildMI(MachineBasicBlock &BB,
                                   MachineBasicBlock::iterator I,
                                   const MIMetadata &MIMD,
                                   const MCInstrDesc &MCID, Register DestReg) { … }

/// This version of the builder inserts the newly-built instruction before
/// the given position in the given MachineBasicBlock, and sets up the first
/// operand as a destination virtual register.
///
/// If \c I is inside a bundle, then the newly inserted \a MachineInstr is
/// added to the same bundle.
inline MachineInstrBuilder BuildMI(MachineBasicBlock &BB,
                                   MachineBasicBlock::instr_iterator I,
                                   const MIMetadata &MIMD,
                                   const MCInstrDesc &MCID, Register DestReg) { … }

inline MachineInstrBuilder BuildMI(MachineBasicBlock &BB, MachineInstr &I,
                                   const MIMetadata &MIMD,
                                   const MCInstrDesc &MCID, Register DestReg) { … }

inline MachineInstrBuilder BuildMI(MachineBasicBlock &BB, MachineInstr *I,
                                   const MIMetadata &MIMD,
                                   const MCInstrDesc &MCID, Register DestReg) { … }

/// This version of the builder inserts the newly-built instruction before the
/// given position in the given MachineBasicBlock, and does NOT take a
/// destination register.
inline MachineInstrBuilder BuildMI(MachineBasicBlock &BB,
                                   MachineBasicBlock::iterator I,
                                   const MIMetadata &MIMD,
                                   const MCInstrDesc &MCID) { … }

inline MachineInstrBuilder BuildMI(MachineBasicBlock &BB,
                                   MachineBasicBlock::instr_iterator I,
                                   const MIMetadata &MIMD,
                                   const MCInstrDesc &MCID) { … }

inline MachineInstrBuilder BuildMI(MachineBasicBlock &BB, MachineInstr &I,
                                   const MIMetadata &MIMD,
                                   const MCInstrDesc &MCID) { … }

inline MachineInstrBuilder BuildMI(MachineBasicBlock &BB, MachineInstr *I,
                                   const MIMetadata &MIMD,
                                   const MCInstrDesc &MCID) { … }

/// This version of the builder inserts the newly-built instruction at the end
/// of the given MachineBasicBlock, and does NOT take a destination register.
inline MachineInstrBuilder BuildMI(MachineBasicBlock *BB,
                                   const MIMetadata &MIMD,
                                   const MCInstrDesc &MCID) { … }

/// This version of the builder inserts the newly-built instruction at the
/// end of the given MachineBasicBlock, and sets up the first operand as a
/// destination virtual register.
inline MachineInstrBuilder BuildMI(MachineBasicBlock *BB,
                                   const MIMetadata &MIMD,
                                   const MCInstrDesc &MCID, Register DestReg) { … }

/// This version of the builder builds a DBG_VALUE intrinsic
/// for either a value in a register or a register-indirect
/// address.  The convention is that a DBG_VALUE is indirect iff the
/// second operand is an immediate.
MachineInstrBuilder BuildMI(MachineFunction &MF, const DebugLoc &DL,
                            const MCInstrDesc &MCID, bool IsIndirect,
                            Register Reg, const MDNode *Variable,
                            const MDNode *Expr);

/// This version of the builder builds a DBG_VALUE or DBG_VALUE_LIST intrinsic
/// for a MachineOperand.
MachineInstrBuilder BuildMI(MachineFunction &MF, const DebugLoc &DL,
                            const MCInstrDesc &MCID, bool IsIndirect,
                            ArrayRef<MachineOperand> MOs,
                            const MDNode *Variable, const MDNode *Expr);

/// This version of the builder builds a DBG_VALUE intrinsic
/// for either a value in a register or a register-indirect
/// address and inserts it at position I.
MachineInstrBuilder BuildMI(MachineBasicBlock &BB,
                            MachineBasicBlock::iterator I, const DebugLoc &DL,
                            const MCInstrDesc &MCID, bool IsIndirect,
                            Register Reg, const MDNode *Variable,
                            const MDNode *Expr);

/// This version of the builder builds a DBG_VALUE, DBG_INSTR_REF, or
/// DBG_VALUE_LIST intrinsic for a machine operand and inserts it at position I.
MachineInstrBuilder BuildMI(MachineBasicBlock &BB,
                            MachineBasicBlock::iterator I, const DebugLoc &DL,
                            const MCInstrDesc &MCID, bool IsIndirect,
                            ArrayRef<MachineOperand> MOs,
                            const MDNode *Variable, const MDNode *Expr);

/// Clone a DBG_VALUE whose value has been spilled to FrameIndex.
MachineInstr *buildDbgValueForSpill(MachineBasicBlock &BB,
                                    MachineBasicBlock::iterator I,
                                    const MachineInstr &Orig, int FrameIndex,
                                    Register SpillReg);
MachineInstr *buildDbgValueForSpill(
    MachineBasicBlock &BB, MachineBasicBlock::iterator I,
    const MachineInstr &Orig, int FrameIndex,
    const SmallVectorImpl<const MachineOperand *> &SpilledOperands);

/// Update a DBG_VALUE whose value has been spilled to FrameIndex. Useful when
/// modifying an instruction in place while iterating over a basic block.
void updateDbgValueForSpill(MachineInstr &Orig, int FrameIndex, Register Reg);

inline unsigned getDefRegState(bool B) { … }
inline unsigned getImplRegState(bool B) { … }
inline unsigned getKillRegState(bool B) { … }
inline unsigned getDeadRegState(bool B) { … }
inline unsigned getUndefRegState(bool B) { … }
inline unsigned getInternalReadRegState(bool B) { … }
inline unsigned getDebugRegState(bool B) { … }
inline unsigned getRenamableRegState(bool B) { … }

/// Get all register state flags from machine operand \p RegOp.
inline unsigned getRegState(const MachineOperand &RegOp) { … }

/// Helper class for constructing bundles of MachineInstrs.
///
/// MIBundleBuilder can create a bundle from scratch by inserting new
/// MachineInstrs one at a time, or it can create a bundle from a sequence of
/// existing MachineInstrs in a basic block.
class MIBundleBuilder { … };

} // end namespace llvm

#endif // LLVM_CODEGEN_MACHINEINSTRBUILDER_H
llvm/llvm/include/llvm/CodeGen/MachineInstrBuilder.h
