BPFFrameLowering.h

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//===-- BPFFrameLowering.h - Define frame lowering for BPF -----*- 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 class implements BPF-specific bits of TargetFrameLowering class.
//
//===----------------------------------------------------------------------===//
 
#ifndef LLVM_LIB_TARGET_BPF_BPFFRAMELOWERING_H
#define LLVM_LIB_TARGET_BPF_BPFFRAMELOWERING_H
 
#include "llvm/CodeGen/TargetFrameLowering.h"
 
namespace llvm {
class BPFSubtarget;
 
class BPFFrameLowering : public TargetFrameLowering {
public:
  explicit BPFFrameLowering(const BPFSubtarget &sti)
      : TargetFrameLowering(TargetFrameLowering::StackGrowsDown, Align(8), 0) {}
 
  void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
  void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
 
  void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
                            RegScavenger *RS) const override;
 
  MachineBasicBlock::iterator
  eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
                                MachineBasicBlock::iterator MI) const override {
    return MBB.erase(MI);
  }
 
  StackOffset getFrameIndexReference(const MachineFunction &MF, int FI,
                                     Register &FrameReg) const override;
 
protected:
  bool hasFPImpl(const MachineFunction &MF) const override;
};
}
#endif