1 //=- LoongArchFrameLowering.h - TargetFrameLowering for LoongArch -*- C++ -*--// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This class implements LoongArch-specific bits of TargetFrameLowering class. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #ifndef LLVM_LIB_TARGET_LOONGARCH_LOONGARCHFRAMELOWERING_H 14 #define LLVM_LIB_TARGET_LOONGARCH_LOONGARCHFRAMELOWERING_H 15 16 #include "llvm/CodeGen/TargetFrameLowering.h" 17 18 namespace llvm { 19 class LoongArchSubtarget; 20 21 class LoongArchFrameLowering : public TargetFrameLowering { 22 const LoongArchSubtarget &STI; 23 24 public: 25 explicit LoongArchFrameLowering(const LoongArchSubtarget &STI) 26 : TargetFrameLowering(StackGrowsDown, 27 /*StackAlignment=*/Align(16), 28 /*LocalAreaOffset=*/0), 29 STI(STI) {} 30 31 void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override; 32 void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override; 33 34 void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs, 35 RegScavenger *RS) const override; 36 37 void processFunctionBeforeFrameFinalized(MachineFunction &MF, 38 RegScavenger *RS) const override; 39 40 bool hasReservedCallFrame(const MachineFunction &MF) const override; 41 MachineBasicBlock::iterator 42 eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB, 43 MachineBasicBlock::iterator MI) const override; 44 bool spillCalleeSavedRegisters(MachineBasicBlock &MBB, 45 MachineBasicBlock::iterator MI, 46 ArrayRef<CalleeSavedInfo> CSI, 47 const TargetRegisterInfo *TRI) const override; 48 49 StackOffset getFrameIndexReference(const MachineFunction &MF, int FI, 50 Register &FrameReg) const override; 51 52 bool hasFP(const MachineFunction &MF) const override; 53 bool hasBP(const MachineFunction &MF) const; 54 55 uint64_t getFirstSPAdjustAmount(const MachineFunction &MF, 56 bool IsPrologue = false) const; 57 58 private: 59 void determineFrameLayout(MachineFunction &MF) const; 60 void adjustReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI, 61 const DebugLoc &DL, Register DestReg, Register SrcReg, 62 int64_t Val, MachineInstr::MIFlag Flag) const; 63 }; 64 } // end namespace llvm 65 #endif // LLVM_LIB_TARGET_LOONGARCH_LOONGARCHFRAMELOWERING_H 66