1 //==-- AArch64FrameLowering.h - TargetFrameLowering for AArch64 --*- C++ -*-==// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_LIB_TARGET_AARCH64_AARCH64FRAMELOWERING_H 15 #define LLVM_LIB_TARGET_AARCH64_AARCH64FRAMELOWERING_H 16 17 #include "llvm/Target/TargetFrameLowering.h" 18 19 namespace llvm { 20 21 class AArch64FrameLowering : public TargetFrameLowering { 22 public: 23 explicit AArch64FrameLowering() 24 : TargetFrameLowering(StackGrowsDown, 16, 0, 16, 25 true /*StackRealignable*/) {} 26 27 void emitCalleeSavedFrameMoves(MachineBasicBlock &MBB, 28 MachineBasicBlock::iterator MBBI) const; 29 30 MachineBasicBlock::iterator 31 eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB, 32 MachineBasicBlock::iterator I) const override; 33 34 /// emitProlog/emitEpilog - These methods insert prolog and epilog code into 35 /// the function. 36 void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override; 37 void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override; 38 39 bool canUseAsPrologue(const MachineBasicBlock &MBB) const override; 40 41 int getFrameIndexReference(const MachineFunction &MF, int FI, 42 unsigned &FrameReg) const override; 43 int resolveFrameIndexReference(const MachineFunction &MF, int FI, 44 unsigned &FrameReg, 45 bool PreferFP = false) const; 46 bool spillCalleeSavedRegisters(MachineBasicBlock &MBB, 47 MachineBasicBlock::iterator MI, 48 const std::vector<CalleeSavedInfo> &CSI, 49 const TargetRegisterInfo *TRI) const override; 50 51 bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB, 52 MachineBasicBlock::iterator MI, 53 const std::vector<CalleeSavedInfo> &CSI, 54 const TargetRegisterInfo *TRI) const override; 55 56 /// \brief Can this function use the red zone for local allocations. 57 bool canUseRedZone(const MachineFunction &MF) const; 58 59 bool hasFP(const MachineFunction &MF) const override; 60 bool hasReservedCallFrame(const MachineFunction &MF) const override; 61 62 void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs, 63 RegScavenger *RS) const override; 64 65 /// Returns true if the target will correctly handle shrink wrapping. 66 bool enableShrinkWrapping(const MachineFunction &MF) const override { 67 return true; 68 } 69 70 bool enableStackSlotScavenging(const MachineFunction &MF) const override; 71 72 private: 73 bool shouldCombineCSRLocalStackBump(MachineFunction &MF, 74 unsigned StackBumpBytes) const; 75 }; 76 77 } // End llvm namespace 78 79 #endif 80
