lib/Target/BPF/BPFFrameLowering.h

   1 //===-- BPFFrameLowering.h - Define frame lowering for BPF -----*- C++ -*--===//
   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 class implements BPF-specific bits of TargetFrameLowering class.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #ifndef LLVM_LIB_TARGET_BPF_BPFFRAMELOWERING_H
  14 #define LLVM_LIB_TARGET_BPF_BPFFRAMELOWERING_H
  15
  16 #include "llvm/CodeGen/TargetFrameLowering.h"
  17
  18 namespace llvm {
  19 class BPFSubtarget;
  20
  21 class BPFFrameLowering : public TargetFrameLowering {
  22 public:
  23   explicit BPFFrameLowering(const BPFSubtarget &sti)
  24       : TargetFrameLowering(TargetFrameLowering::StackGrowsDown, 8, 0) {}
  25
  26   void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
  27   void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
  28
  29   bool hasFP(const MachineFunction &MF) const override;
  30   void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
  31                             RegScavenger *RS) const override;
  32
  33   MachineBasicBlock::iterator
  34   eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
  35                                 MachineBasicBlock::iterator MI) const override {
  36     return MBB.erase(MI);
  37   }
  38 };
  39 }
  40 #endif