Cpu0FrameLowering.cpp

// Copyright 2022 All Rights Reserved.
// Author: lanzongwei541@gmail.com (lanzongwei)
//
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//===-- Cpu0FrameLowering.cpp - Frame Information for Cpu0 ------*- C++ -*-===//
//
// This file contains the Cpu0 implementation of TargetFrameLowering class.
//
//===----------------------------------------------------------------------===//

#include "Cpu0FrameLowering.h"

#include "Cpu0InstrInfo.h"
#include "Cpu0MachineFunction.h"
#include "Cpu0Subtarget.h"

#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/Function.h"
#include "llvm/Target/TargetOptions.h"

using namespace llvm;

const Cpu0FrameLowering *Cpu0FrameLowering::create(const Cpu0Subtarget &ST) {
  return llvm::createCpu0SEFrameLowering(ST);
}

// Reture true if the specified function should have a dedicated frame pointer
// register. This is true if the function has variable sized allocas,
// if it needs dynamic stack realignment, if frame pointer elimination is
// disabled, or if the frame address is taken.
bool Cpu0FrameLowering::hasFP(const MachineFunction &MF) const {
  const MachineFrameInfo &MFI = MF.getFrameInfo();
  const TargetRegisterInfo *TRI = STI.getRegisterInfo();

  return MF.getTarget().Options.DisableFramePointerElim(MF) ||
         MFI.hasVarSizedObjects() || MFI.isFrameAddressTaken() ||
         TRI->hasStackRealignment(MF);
}