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 #include "llvm/Support/TypeSize.h"
19 
20 namespace llvm {
21 
22 class SparcSubtarget;
23 class SparcFrameLowering : public TargetFrameLowering {
24 public:
25   explicit SparcFrameLowering(const SparcSubtarget &ST);
26 
27   /// emitProlog/emitEpilog - These methods insert prolog and epilog code into
28   /// the function.
29   void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
30   void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
31 
32   MachineBasicBlock::iterator
33   eliminateCallFramePseudoInstr(MachineFunction &MF,
34                                 MachineBasicBlock &MBB,
35                                 MachineBasicBlock::iterator I) const override;
36 
37   bool hasReservedCallFrame(const MachineFunction &MF) const override;
38   bool hasFP(const MachineFunction &MF) const override;
39   void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
40                             RegScavenger *RS = nullptr) const override;
41 
42   StackOffset getFrameIndexReference(const MachineFunction &MF, int FI,
43                                      Register &FrameReg) const override;
44 
45   /// targetHandlesStackFrameRounding - Returns true if the target is
46   /// responsible for rounding up the stack frame (probably at emitPrologue
47   /// time).
targetHandlesStackFrameRounding()48   bool targetHandlesStackFrameRounding() const override { return true; }
49 
50 private:
51   // Remap input registers to output registers for leaf procedure.
52   void remapRegsForLeafProc(MachineFunction &MF) const;
53 
54   // Returns true if MF is a leaf procedure.
55   bool isLeafProc(MachineFunction &MF) const;
56 
57 
58   // Emits code for adjusting SP in function prologue/epilogue.
59   void emitSPAdjustment(MachineFunction &MF,
60                         MachineBasicBlock &MBB,
61                         MachineBasicBlock::iterator MBBI,
62                         int NumBytes, unsigned ADDrr, unsigned ADDri) const;
63 
64 };
65 
66 } // End llvm namespace
67 
68 #endif
69