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      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/Target/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
     69