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   bool enableShrinkWrapping(const MachineFunction &MF) const override;
59 
60 private:
61   void determineFrameLayout(MachineFunction &MF) const;
62   void adjustReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI,
63                  const DebugLoc &DL, Register DestReg, Register SrcReg,
64                  int64_t Val, MachineInstr::MIFlag Flag) const;
65 };
66 } // end namespace llvm
67 #endif // LLVM_LIB_TARGET_LOONGARCH_LOONGARCHFRAMELOWERING_H
68