lib/Target/Sparc/SparcFrameLowering.h

   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