BPFFrameLowering.cpp

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//===-- BPFFrameLowering.cpp - BPF Frame Information ----------------------===//
//
// 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 contains the BPF implementation of TargetFrameLowering class.
//
//===----------------------------------------------------------------------===//
 
#include "BPFFrameLowering.h"
#include "BPFSubtarget.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
 
using namespace llvm;
 
bool BPFFrameLowering::hasFPImpl(const MachineFunction &MF) const {
  return true;
}
 
void BPFFrameLowering::emitPrologue(MachineFunction &MF,
                                    MachineBasicBlock &MBB) const {}
 
void BPFFrameLowering::emitEpilogue(MachineFunction &MF,
                                    MachineBasicBlock &MBB) const {}
 
void BPFFrameLowering::determineCalleeSaves(MachineFunction &MF,
                                            BitVector &SavedRegs,
                                            RegScavenger *RS) const {
  TargetFrameLowering::determineCalleeSaves(MF, SavedRegs, RS);
  SavedRegs.reset(BPF::R6);
  SavedRegs.reset(BPF::R7);
  SavedRegs.reset(BPF::R8);
  SavedRegs.reset(BPF::R9);
}
 
StackOffset BPFFrameLowering::getFrameIndexReference(const MachineFunction &MF,
                                                     int FI,
                                                     Register &FrameReg) const {
  const MachineFrameInfo &MFI = MF.getFrameInfo();
  const TargetRegisterInfo *RI = MF.getSubtarget().getRegisterInfo();
 
  FrameReg = RI->getFrameRegister(MF);
 
  return StackOffset::getFixed(MFI.getObjectOffset(FI));
}