1 //===-- SparcFrameLowering.h - Define frame lowering for Sparc --*- 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 //
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #ifndef LLVM_LIB_TARGET_SPARC_SPARCFRAMELOWERING_H
14 #define LLVM_LIB_TARGET_SPARC_SPARCFRAMELOWERING_H
15 
16 #include "Sparc.h"
17 #include "llvm/CodeGen/TargetFrameLowering.h"
18 
19 namespace llvm {
20 
21 class SparcSubtarget;
22 class SparcFrameLowering : public TargetFrameLowering {
23 public:
24   explicit SparcFrameLowering(const SparcSubtarget &ST);
25 
26   /// emitProlog/emitEpilog - These methods insert prolog and epilog code into
27   /// the function.
28   void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
29   void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
30 
31   MachineBasicBlock::iterator
32   eliminateCallFramePseudoInstr(MachineFunction &MF,
33                                 MachineBasicBlock &MBB,
34                                 MachineBasicBlock::iterator I) const override;
35 
36   bool hasReservedCallFrame(const MachineFunction &MF) const override;
37   bool hasFP(const MachineFunction &MF) const override;
38   void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
39                             RegScavenger *RS = nullptr) const override;
40 
41   int getFrameIndexReference(const MachineFunction &MF, int FI,
42                              unsigned &FrameReg) const override;
43 
44   /// targetHandlesStackFrameRounding - Returns true if the target is
45   /// responsible for rounding up the stack frame (probably at emitPrologue
46   /// time).
47   bool targetHandlesStackFrameRounding() const override { return true; }
48 
49 private:
50   // Remap input registers to output registers for leaf procedure.
51   void remapRegsForLeafProc(MachineFunction &MF) const;
52 
53   // Returns true if MF is a leaf procedure.
54   bool isLeafProc(MachineFunction &MF) const;
55 
56 
57   // Emits code for adjusting SP in function prologue/epilogue.
58   void emitSPAdjustment(MachineFunction &MF,
59                         MachineBasicBlock &MBB,
60                         MachineBasicBlock::iterator MBBI,
61                         int NumBytes, unsigned ADDrr, unsigned ADDri) const;
62 
63 };
64 
65 } // End llvm namespace
66 
67 #endif
68