lib/Target/Sparc/SparcFrameLowering.h

   1 //===-- SparcFrameLowering.h - Define frame lowering for Sparc --*- 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_SPARC_SPARCFRAMELOWERING_H
  15 #define LLVM_LIB_TARGET_SPARC_SPARCFRAMELOWERING_H
  16
  17 #include "Sparc.h"
  18 #include "llvm/CodeGen/TargetFrameLowering.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   int getFrameIndexReference(const MachineFunction &MF, int FI,
  43                              unsigned &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).
  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