lib/Target/BPF/BPFFrameLowering.cpp

   1 //===-- BPFFrameLowering.cpp - BPF Frame Information ----------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file contains the BPF implementation of TargetFrameLowering class.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "BPFFrameLowering.h"
  14 #include "BPFInstrInfo.h"
  15 #include "BPFSubtarget.h"
  16 #include "llvm/CodeGen/MachineFrameInfo.h"
  17 #include "llvm/CodeGen/MachineFunction.h"
  18 #include "llvm/CodeGen/MachineInstrBuilder.h"
  19 #include "llvm/CodeGen/MachineRegisterInfo.h"
  20
  21 using namespace llvm;
  22
  23 bool BPFFrameLowering::hasFP(const MachineFunction &MF) const { return true; }
  24
  25 void BPFFrameLowering::emitPrologue(MachineFunction &MF,
  26                                     MachineBasicBlock &MBB) const {}
  27
  28 void BPFFrameLowering::emitEpilogue(MachineFunction &MF,
  29                                     MachineBasicBlock &MBB) const {}
  30
  31 void BPFFrameLowering::determineCalleeSaves(MachineFunction &MF,
  32                                             BitVector &SavedRegs,
  33                                             RegScavenger *RS) const {
  34   TargetFrameLowering::determineCalleeSaves(MF, SavedRegs, RS);
  35   SavedRegs.reset(BPF::R6);
  36   SavedRegs.reset(BPF::R7);
  37   SavedRegs.reset(BPF::R8);
  38   SavedRegs.reset(BPF::R9);
  39 }