lib/Target/BPF/BPFFrameLowering.cpp

   1 //===-- BPFFrameLowering.cpp - BPF Frame Information ----------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file contains the BPF implementation of TargetFrameLowering class.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "BPFFrameLowering.h"
  15 #include "BPFInstrInfo.h"
  16 #include "BPFSubtarget.h"
  17 #include "llvm/CodeGen/MachineFrameInfo.h"
  18 #include "llvm/CodeGen/MachineFunction.h"
  19 #include "llvm/CodeGen/MachineInstrBuilder.h"
  20 #include "llvm/CodeGen/MachineRegisterInfo.h"
  21
  22 using namespace llvm;
  23
  24 bool BPFFrameLowering::hasFP(const MachineFunction &MF) const { return true; }
  25
  26 void BPFFrameLowering::emitPrologue(MachineFunction &MF,
  27                                     MachineBasicBlock &MBB) const {}
  28
  29 void BPFFrameLowering::emitEpilogue(MachineFunction &MF,
  30                                     MachineBasicBlock &MBB) const {}
  31
  32 void BPFFrameLowering::determineCalleeSaves(MachineFunction &MF,
  33                                             BitVector &SavedRegs,
  34                                             RegScavenger *RS) const {
  35   TargetFrameLowering::determineCalleeSaves(MF, SavedRegs, RS);
  36   SavedRegs.reset(BPF::R6);
  37   SavedRegs.reset(BPF::R7);
  38   SavedRegs.reset(BPF::R8);
  39   SavedRegs.reset(BPF::R9);
  40 }