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1 //==-- AArch64FrameLowering.h - TargetFrameLowering for AArch64 --*- 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 //
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #ifndef LLVM_LIB_TARGET_AARCH64_AARCH64FRAMELOWERING_H
15 #define LLVM_LIB_TARGET_AARCH64_AARCH64FRAMELOWERING_H
16 
17 #include "llvm/Target/TargetFrameLowering.h"
18 
19 namespace llvm {
20 
21 class AArch64FrameLowering : public TargetFrameLowering {
22 public:
AArch64FrameLowering()23   explicit AArch64FrameLowering()
24       : TargetFrameLowering(StackGrowsDown, 16, 0, 16,
25                             true /*StackRealignable*/) {}
26 
27   void emitCalleeSavedFrameMoves(MachineBasicBlock &MBB,
28                                  MachineBasicBlock::iterator MBBI,
29                                  unsigned FramePtr) const;
30 
31   void eliminateCallFramePseudoInstr(MachineFunction &MF,
32                                   MachineBasicBlock &MBB,
33                                   MachineBasicBlock::iterator I) const override;
34 
35   /// emitProlog/emitEpilog - These methods insert prolog and epilog code into
36   /// the function.
37   void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
38   void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
39 
40   int getFrameIndexReference(const MachineFunction &MF, int FI,
41                              unsigned &FrameReg) const override;
42   int resolveFrameIndexReference(const MachineFunction &MF, int FI,
43                                  unsigned &FrameReg,
44                                  bool PreferFP = false) const;
45   bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
46                                  MachineBasicBlock::iterator MI,
47                                  const std::vector<CalleeSavedInfo> &CSI,
48                                  const TargetRegisterInfo *TRI) const override;
49 
50   bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
51                                   MachineBasicBlock::iterator MI,
52                                   const std::vector<CalleeSavedInfo> &CSI,
53                                   const TargetRegisterInfo *TRI) const override;
54 
55   /// \brief Can this function use the red zone for local allocations.
56   bool canUseRedZone(const MachineFunction &MF) const;
57 
58   bool hasFP(const MachineFunction &MF) const override;
59   bool hasReservedCallFrame(const MachineFunction &MF) const override;
60 
61   void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
62                             RegScavenger *RS) const override;
63 
64   /// Returns true if the target will correctly handle shrink wrapping.
enableShrinkWrapping(const MachineFunction & MF)65   bool enableShrinkWrapping(const MachineFunction &MF) const override {
66     return true;
67   }
68 };
69 
70 } // End llvm namespace
71 
72 #endif
73