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
18namespace llvm {
19class LoongArchSubtarget;
20
21class LoongArchFrameLowering : public TargetFrameLowering {
22  const LoongArchSubtarget &STI;
23
24public:
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
58private:
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