| //==-- AArch64FrameLowering.h - TargetFrameLowering for AArch64 --*- 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_AARCH64_AARCH64FRAMELOWERING_H |
| #define LLVM_LIB_TARGET_AARCH64_AARCH64FRAMELOWERING_H |
| |
| #include "llvm/Support/TypeSize.h" |
| #include "llvm/CodeGen/TargetFrameLowering.h" |
| |
| namespace llvm { |
| |
| class MCCFIInstruction; |
| |
| class AArch64FrameLowering : public TargetFrameLowering { |
| public: |
| explicit AArch64FrameLowering() |
| : TargetFrameLowering(StackGrowsDown, Align(16), 0, Align(16), |
| true /*StackRealignable*/) {} |
| |
| void |
| emitCalleeSavedFrameMoves(MachineBasicBlock &MBB, |
| MachineBasicBlock::iterator MBBI) const override; |
| |
| MachineBasicBlock::iterator |
| 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; |
| |
| bool |
| 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; |
| |
| bool assignCalleeSavedSpillSlots(MachineFunction &MF, |
| const TargetRegisterInfo *TRI, |
| std::vector<CalleeSavedInfo> &CSI, |
| unsigned &MinCSFrameIndex, |
| unsigned &MaxCSFrameIndex) 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; |
| |
| void |
| processFunctionBeforeFrameIndicesReplaced(MachineFunction &MF, |
| RegScavenger *RS) const override; |
| |
| unsigned getWinEHParentFrameOffset(const MachineFunction &MF) const override; |
| |
| unsigned getWinEHFuncletFrameSize(const MachineFunction &MF) const; |
| |
| StackOffset |
| 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) { |
| default: |
| 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; |
| } |
| |
| void |
| orderFrameObjects(const MachineFunction &MF, |
| SmallVectorImpl<int> &ObjectsToAllocate) const override; |
| |
| private: |
| /// 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; |
| MCCFIInstruction |
| 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 |
| |
| #endif |