1 //===-- LanaiFrameLowering.h - Define frame lowering for Lanai --*- 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 Lanai-specific bits of TargetFrameLowering class.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #ifndef LLVM_LIB_TARGET_LANAI_LANAIFRAMELOWERING_H
14 #define LLVM_LIB_TARGET_LANAI_LANAIFRAMELOWERING_H
15 
16 #include "llvm/CodeGen/TargetFrameLowering.h"
17 
18 namespace llvm {
19 
20 class BitVector;
21 class LanaiSubtarget;
22 
23 class LanaiFrameLowering : public TargetFrameLowering {
24 private:
25   void determineFrameLayout(MachineFunction &MF) const;
26   void replaceAdjDynAllocPseudo(MachineFunction &MF) const;
27 
28 protected:
29   const LanaiSubtarget &STI;
30 
31 public:
32   explicit LanaiFrameLowering(const LanaiSubtarget &Subtarget)
33       : TargetFrameLowering(StackGrowsDown,
34                             /*StackAlignment=*/8,
35                             /*LocalAreaOffset=*/0),
36         STI(Subtarget) {}
37 
38   // emitProlog/emitEpilog - These methods insert prolog and epilog code into
39   // the function.
40   void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
41   void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
42 
43   MachineBasicBlock::iterator
44   eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
45                                 MachineBasicBlock::iterator I) const override;
46 
47   bool hasFP(const MachineFunction & /*MF*/) const override { return true; }
48 
49   void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
50                             RegScavenger *RS = nullptr) const override;
51 };
52 
53 } // namespace llvm
54 
55 #endif // LLVM_LIB_TARGET_LANAI_LANAIFRAMELOWERING_H
56