1 //===-- CSKYFrameLowering.h - Define frame lowering for CSKY -*- 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 CSKY-specific bits of TargetFrameLowering class. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #ifndef LLVM_LIB_TARGET_CSKY_CSKYFRAMELOWERING_H 14 #define LLVM_LIB_TARGET_CSKY_CSKYFRAMELOWERING_H 15 16 #include "llvm/CodeGen/TargetFrameLowering.h" 17 18 namespace llvm { 19 class CSKYSubtarget; 20 21 class CSKYFrameLowering : public TargetFrameLowering { 22 const CSKYSubtarget &STI; 23 24 void determineFrameLayout(MachineFunction &MF) const; 25 void adjustReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI, 26 const DebugLoc &DL, Register DestReg, Register SrcReg, 27 int64_t Val, MachineInstr::MIFlag Flag) const; 28 29 public: 30 explicit CSKYFrameLowering(const CSKYSubtarget &STI) 31 : TargetFrameLowering(StackGrowsDown, 32 /*StackAlignment=*/Align(4), 33 /*LocalAreaOffset=*/0), 34 STI(STI) {} 35 36 void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override; 37 void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override; 38 39 StackOffset getFrameIndexReference(const MachineFunction &MF, int FI, 40 Register &FrameReg) const override; 41 42 void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs, 43 RegScavenger *RS) const override; 44 45 bool assignCalleeSavedSpillSlots( 46 MachineFunction &MF, const TargetRegisterInfo *TRI, 47 std::vector<CalleeSavedInfo> &CSI) const override { 48 49 std::reverse(CSI.begin(), CSI.end()); 50 51 return false; 52 } 53 54 bool spillCalleeSavedRegisters(MachineBasicBlock &MBB, 55 MachineBasicBlock::iterator MI, 56 ArrayRef<CalleeSavedInfo> CSI, 57 const TargetRegisterInfo *TRI) const override; 58 bool 59 restoreCalleeSavedRegisters(MachineBasicBlock &MBB, 60 MachineBasicBlock::iterator MI, 61 MutableArrayRef<CalleeSavedInfo> CSI, 62 const TargetRegisterInfo *TRI) const override; 63 64 bool hasFP(const MachineFunction &MF) const override; 65 bool hasBP(const MachineFunction &MF) const; 66 67 bool hasReservedCallFrame(const MachineFunction &MF) const override; 68 69 MachineBasicBlock::iterator 70 eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB, 71 MachineBasicBlock::iterator MI) const override; 72 }; 73 } // namespace llvm 74 #endif 75