1 //===-- RISCVFrameLowering.h - Define frame lowering for RISCV -*- 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 // This class implements RISCV-specific bits of TargetFrameLowering class. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_LIB_TARGET_RISCV_RISCVFRAMELOWERING_H 15 #define LLVM_LIB_TARGET_RISCV_RISCVFRAMELOWERING_H 16 17 #include "llvm/CodeGen/TargetFrameLowering.h" 18 19 namespace llvm { 20 class RISCVSubtarget; 21 22 class RISCVFrameLowering : public TargetFrameLowering { 23 public: 24 explicit RISCVFrameLowering(const RISCVSubtarget &STI) 25 : TargetFrameLowering(StackGrowsDown, 26 /*StackAlignment=*/16, 27 /*LocalAreaOffset=*/0), 28 STI(STI) {} 29 30 void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override; 31 void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override; 32 33 int getFrameIndexReference(const MachineFunction &MF, int FI, 34 unsigned &FrameReg) const override; 35 36 void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs, 37 RegScavenger *RS) const override; 38 39 void processFunctionBeforeFrameFinalized(MachineFunction &MF, 40 RegScavenger *RS) const override; 41 42 bool hasFP(const MachineFunction &MF) const override; 43 44 bool hasReservedCallFrame(const MachineFunction &MF) const override; 45 MachineBasicBlock::iterator 46 eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB, 47 MachineBasicBlock::iterator MI) const override; 48 49 protected: 50 const RISCVSubtarget &STI; 51 52 private: 53 void determineFrameLayout(MachineFunction &MF) const; 54 void adjustReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI, 55 const DebugLoc &DL, unsigned DestReg, unsigned SrcReg, 56 int64_t Val, MachineInstr::MIFlag Flag) const; 57 }; 58 } 59 #endif 60
