LanaiFrameLowering.h

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//===-- LanaiFrameLowering.h - Define frame lowering for Lanai --*- 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 Lanai-specific bits of TargetFrameLowering class.
//
//===----------------------------------------------------------------------===//
 
#ifndef LLVM_LIB_TARGET_LANAI_LANAIFRAMELOWERING_H
#define LLVM_LIB_TARGET_LANAI_LANAIFRAMELOWERING_H
 
#include "llvm/CodeGen/TargetFrameLowering.h"
 
namespace llvm {
 
class BitVector;
class LanaiSubtarget;
 
class LanaiFrameLowering : public TargetFrameLowering {
private:
  void determineFrameLayout(MachineFunction &MF) const;
  void replaceAdjDynAllocPseudo(MachineFunction &MF) const;
 
protected:
  const LanaiSubtarget &STI;
 
public:
  explicit LanaiFrameLowering(const LanaiSubtarget &Subtarget)
      : TargetFrameLowering(StackGrowsDown,
                            /*StackAlignment=*/Align(8),
                            /*LocalAreaOffset=*/0),
        STI(Subtarget) {}
 
  // emitProlog/emitEpilog - These methods insert prolog and epilog code into
  // the function.
  void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
  void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
 
  MachineBasicBlock::iterator
  eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
                                MachineBasicBlock::iterator I) const override;
 
  bool hasFP(const MachineFunction & /*MF*/) const override { return true; }
 
  void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
                            RegScavenger *RS = nullptr) const override;
};
 
} // namespace llvm
 
#endif // LLVM_LIB_TARGET_LANAI_LANAIFRAMELOWERING_H