SparcFrameLowering.h

Go to the documentation of this file.

//===-- SparcFrameLowering.h - Define frame lowering for Sparc --*- 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
//
//===----------------------------------------------------------------------===//
//
//
//
//===----------------------------------------------------------------------===//
 
#ifndef LLVM_LIB_TARGET_SPARC_SPARCFRAMELOWERING_H
#define LLVM_LIB_TARGET_SPARC_SPARCFRAMELOWERING_H
 
#include "Sparc.h"
#include "llvm/CodeGen/TargetFrameLowering.h"
#include "llvm/Support/TypeSize.h"
 
namespace llvm {
 
class SparcSubtarget;
class SparcFrameLowering : public TargetFrameLowering {
  const SparcSubtarget &STI;
 
public:
  explicit SparcFrameLowering(const SparcSubtarget &ST);
 
  /// 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 hasReservedCallFrame(const MachineFunction &MF) const override;
  void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
                            RegScavenger *RS = nullptr) const override;
 
  StackOffset getFrameIndexReference(const MachineFunction &MF, int FI,
                                     Register &FrameReg) const override;
 
  /// targetHandlesStackFrameRounding - Returns true if the target is
  /// responsible for rounding up the stack frame (probably at emitPrologue
  /// time).
  bool targetHandlesStackFrameRounding() const override { return true; }
 
  void processFunctionBeforeFrameFinalized(MachineFunction &MF,
                                           RegScavenger *RS) const override;
 
protected:
  bool hasFPImpl(const MachineFunction &MF) const override;
 
private:
  // Remap input registers to output registers for leaf procedure.
  void remapRegsForLeafProc(MachineFunction &MF) const;
 
  // Returns true if MF is a leaf procedure.
  bool isLeafProc(MachineFunction &MF) const;
 
 
  // Emits code for adjusting SP in function prologue/epilogue.
  void emitSPAdjustment(MachineFunction &MF, MachineBasicBlock &MBB,
                        MachineBasicBlock::iterator MBBI, const DebugLoc &dl,
                        int NumBytes, unsigned ADDrr, unsigned ADDri) const;
};
 
} // End llvm namespace
 
#endif