180 lines
7.8 KiB
C
180 lines
7.8 KiB
C
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//==-- AArch64FrameLowering.h - TargetFrameLowering for AArch64 --*- C++ -*-==//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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//
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_AARCH64_AARCH64FRAMELOWERING_H
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#define LLVM_LIB_TARGET_AARCH64_AARCH64FRAMELOWERING_H
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#include "llvm/Support/TypeSize.h"
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#include "llvm/CodeGen/TargetFrameLowering.h"
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namespace llvm {
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class AArch64FrameLowering : public TargetFrameLowering {
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public:
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explicit AArch64FrameLowering()
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: TargetFrameLowering(StackGrowsDown, Align(16), 0, Align(16),
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true /*StackRealignable*/) {}
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void resetCFIToInitialState(MachineBasicBlock &MBB) const override;
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MachineBasicBlock::iterator
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eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
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MachineBasicBlock::iterator I) const override;
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/// emitProlog/emitEpilog - These methods insert prolog and epilog code into
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/// the function.
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void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
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void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
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bool enableCFIFixup(MachineFunction &MF) const override;
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bool canUseAsPrologue(const MachineBasicBlock &MBB) const override;
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StackOffset getFrameIndexReference(const MachineFunction &MF, int FI,
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Register &FrameReg) const override;
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StackOffset resolveFrameIndexReference(const MachineFunction &MF, int FI,
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Register &FrameReg, bool PreferFP,
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bool ForSimm) const;
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StackOffset resolveFrameOffsetReference(const MachineFunction &MF,
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int64_t ObjectOffset, bool isFixed,
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bool isSVE, Register &FrameReg,
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bool PreferFP, bool ForSimm) const;
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bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI,
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ArrayRef<CalleeSavedInfo> CSI,
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const TargetRegisterInfo *TRI) const override;
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bool
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restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI,
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MutableArrayRef<CalleeSavedInfo> CSI,
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const TargetRegisterInfo *TRI) const override;
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/// Can this function use the red zone for local allocations.
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bool canUseRedZone(const MachineFunction &MF) const;
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bool hasFP(const MachineFunction &MF) const override;
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bool hasReservedCallFrame(const MachineFunction &MF) const override;
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bool assignCalleeSavedSpillSlots(MachineFunction &MF,
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const TargetRegisterInfo *TRI,
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std::vector<CalleeSavedInfo> &CSI,
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unsigned &MinCSFrameIndex,
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unsigned &MaxCSFrameIndex) const override;
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void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
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RegScavenger *RS) const override;
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/// Returns true if the target will correctly handle shrink wrapping.
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bool enableShrinkWrapping(const MachineFunction &MF) const override {
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return true;
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}
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bool enableStackSlotScavenging(const MachineFunction &MF) const override;
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TargetStackID::Value getStackIDForScalableVectors() const override;
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void processFunctionBeforeFrameFinalized(MachineFunction &MF,
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RegScavenger *RS) const override;
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void
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processFunctionBeforeFrameIndicesReplaced(MachineFunction &MF,
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RegScavenger *RS) const override;
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unsigned getWinEHParentFrameOffset(const MachineFunction &MF) const override;
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unsigned getWinEHFuncletFrameSize(const MachineFunction &MF) const;
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StackOffset
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getFrameIndexReferencePreferSP(const MachineFunction &MF, int FI,
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Register &FrameReg,
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bool IgnoreSPUpdates) const override;
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StackOffset getNonLocalFrameIndexReference(const MachineFunction &MF,
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int FI) const override;
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int getSEHFrameIndexOffset(const MachineFunction &MF, int FI) const;
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bool isSupportedStackID(TargetStackID::Value ID) const override {
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switch (ID) {
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default:
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return false;
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case TargetStackID::Default:
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case TargetStackID::ScalableVector:
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case TargetStackID::NoAlloc:
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return true;
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}
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}
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bool isStackIdSafeForLocalArea(unsigned StackId) const override {
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// We don't support putting SVE objects into the pre-allocated local
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// frame block at the moment.
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return StackId != TargetStackID::ScalableVector;
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}
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void
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orderFrameObjects(const MachineFunction &MF,
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SmallVectorImpl<int> &ObjectsToAllocate) const override;
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private:
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/// Returns true if a homogeneous prolog or epilog code can be emitted
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/// for the size optimization. If so, HOM_Prolog/HOM_Epilog pseudo
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/// instructions are emitted in place. When Exit block is given, this check is
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/// for epilog.
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bool homogeneousPrologEpilog(MachineFunction &MF,
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MachineBasicBlock *Exit = nullptr) const;
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/// Returns true if CSRs should be paired.
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bool producePairRegisters(MachineFunction &MF) const;
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bool shouldCombineCSRLocalStackBump(MachineFunction &MF,
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uint64_t StackBumpBytes) const;
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int64_t estimateSVEStackObjectOffsets(MachineFrameInfo &MF) const;
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int64_t assignSVEStackObjectOffsets(MachineFrameInfo &MF,
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int &MinCSFrameIndex,
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int &MaxCSFrameIndex) const;
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bool shouldCombineCSRLocalStackBumpInEpilogue(MachineBasicBlock &MBB,
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unsigned StackBumpBytes) const;
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void emitCalleeSavedGPRLocations(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBI) const;
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void emitCalleeSavedSVELocations(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBI) const;
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void emitCalleeSavedGPRRestores(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBI) const;
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void emitCalleeSavedSVERestores(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBI) const;
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void allocateStackSpace(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MBBI,
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int64_t RealignmentPadding, StackOffset AllocSize,
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bool NeedsWinCFI, bool *HasWinCFI, bool EmitCFI,
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StackOffset InitialOffset, bool FollowupAllocs) const;
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/// Emit target zero call-used regs.
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void emitZeroCallUsedRegs(BitVector RegsToZero,
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MachineBasicBlock &MBB) const override;
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/// Replace a StackProbe stub (if any) with the actual probe code inline
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void inlineStackProbe(MachineFunction &MF,
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MachineBasicBlock &PrologueMBB) const override;
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void inlineStackProbeFixed(MachineBasicBlock::iterator MBBI,
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Register ScratchReg, int64_t FrameSize,
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StackOffset CFAOffset) const;
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MachineBasicBlock::iterator
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inlineStackProbeLoopExactMultiple(MachineBasicBlock::iterator MBBI,
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int64_t NegProbeSize,
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Register TargetReg) const;
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};
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} // End llvm namespace
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#endif
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