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//==-- AArch64FrameLowering.h - TargetFrameLowering for AArch64 --*- C++ -*-==//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#include "llvm/Support/TypeSize.h"
#include "llvm/CodeGen/TargetFrameLowering.h"
namespace llvm {
class MCCFIInstruction;
class AArch64FrameLowering : public TargetFrameLowering {
explicit AArch64FrameLowering()
: TargetFrameLowering(StackGrowsDown, Align(16), 0, Align(16),
true /*StackRealignable*/) {}
emitCalleeSavedFrameMoves(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MBBI) const override;
eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator I) const override;
/// 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;
bool canUseAsPrologue(const MachineBasicBlock &MBB) const override;
StackOffset getFrameIndexReference(const MachineFunction &MF, int FI,
Register &FrameReg) const override;
StackOffset resolveFrameIndexReference(const MachineFunction &MF, int FI,
Register &FrameReg, bool PreferFP,
bool ForSimm) const;
StackOffset resolveFrameOffsetReference(const MachineFunction &MF,
int64_t ObjectOffset, bool isFixed,
bool isSVE, Register &FrameReg,
bool PreferFP, bool ForSimm) const;
bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
ArrayRef<CalleeSavedInfo> CSI,
const TargetRegisterInfo *TRI) const override;
restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
MutableArrayRef<CalleeSavedInfo> CSI,
const TargetRegisterInfo *TRI) const override;
/// Can this function use the red zone for local allocations.
bool canUseRedZone(const MachineFunction &MF) const;
bool hasFP(const MachineFunction &MF) const override;
bool hasReservedCallFrame(const MachineFunction &MF) const override;
assignCalleeSavedSpillSlots(MachineFunction &MF,
const TargetRegisterInfo *TRI,
std::vector<CalleeSavedInfo> &CSI) const override;
void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
RegScavenger *RS) const override;
/// Returns true if the target will correctly handle shrink wrapping.
bool enableShrinkWrapping(const MachineFunction &MF) const override {
return true;
bool enableStackSlotScavenging(const MachineFunction &MF) const override;
TargetStackID::Value getStackIDForScalableVectors() const override;
void processFunctionBeforeFrameFinalized(MachineFunction &MF,
RegScavenger *RS) const override;
processFunctionBeforeFrameIndicesReplaced(MachineFunction &MF,
RegScavenger *RS) const override;
unsigned getWinEHParentFrameOffset(const MachineFunction &MF) const override;
unsigned getWinEHFuncletFrameSize(const MachineFunction &MF) const;
getFrameIndexReferencePreferSP(const MachineFunction &MF, int FI,
Register &FrameReg,
bool IgnoreSPUpdates) const override;
StackOffset getNonLocalFrameIndexReference(const MachineFunction &MF,
int FI) const override;
int getSEHFrameIndexOffset(const MachineFunction &MF, int FI) const;
bool isSupportedStackID(TargetStackID::Value ID) const override {
switch (ID) {
return false;
case TargetStackID::Default:
case TargetStackID::ScalableVector:
case TargetStackID::NoAlloc:
return true;
bool isStackIdSafeForLocalArea(unsigned StackId) const override {
// We don't support putting SVE objects into the pre-allocated local
// frame block at the moment.
return StackId != TargetStackID::ScalableVector;
orderFrameObjects(const MachineFunction &MF,
SmallVectorImpl<int> &ObjectsToAllocate) const override;
/// Returns true if a homogeneous prolog or epilog code can be emitted
/// for the size optimization. If so, HOM_Prolog/HOM_Epilog pseudo
/// instructions are emitted in place. When Exit block is given, this check is
/// for epilog.
bool homogeneousPrologEpilog(MachineFunction &MF,
MachineBasicBlock *Exit = nullptr) const;
/// Returns true if CSRs should be paired.
bool producePairRegisters(MachineFunction &MF) const;
bool shouldCombineCSRLocalStackBump(MachineFunction &MF,
uint64_t StackBumpBytes) const;
int64_t estimateSVEStackObjectOffsets(MachineFrameInfo &MF) const;
int64_t assignSVEStackObjectOffsets(MachineFrameInfo &MF,
int &MinCSFrameIndex,
int &MaxCSFrameIndex) const;
createDefCFAExpressionFromSP(const TargetRegisterInfo &TRI,
const StackOffset &OffsetFromSP) const;
MCCFIInstruction createCfaOffset(const TargetRegisterInfo &MRI, unsigned DwarfReg,
const StackOffset &OffsetFromDefCFA) const;
bool shouldCombineCSRLocalStackBumpInEpilogue(MachineBasicBlock &MBB,
unsigned StackBumpBytes) const;
} // End llvm namespace