contrib/llvm/lib/Target/SystemZ/SystemZFrameLowering.h

   1 //===-- SystemZFrameLowering.h - Frame lowering for SystemZ -----*- 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 #ifndef LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZFRAMELOWERING_H
  11 #define LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZFRAMELOWERING_H
  12
  13 #include "llvm/ADT/IndexedMap.h"
  14 #include "llvm/CodeGen/TargetFrameLowering.h"
  15
  16 namespace llvm {
  17 class SystemZTargetMachine;
  18 class SystemZSubtarget;
  19
  20 class SystemZFrameLowering : public TargetFrameLowering {
  21   IndexedMap<unsigned> RegSpillOffsets;
  22
  23 public:
  24   SystemZFrameLowering();
  25
  26   // Override TargetFrameLowering.
  27   bool isFPCloseToIncomingSP() const override { return false; }
  28   const SpillSlot *getCalleeSavedSpillSlots(unsigned &NumEntries) const
  29     override;
  30   void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
  31                             RegScavenger *RS) const override;
  32   bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
  33                                  MachineBasicBlock::iterator MBBI,
  34                                  const std::vector<CalleeSavedInfo> &CSI,
  35                                  const TargetRegisterInfo *TRI) const override;
  36   bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
  37                                    MachineBasicBlock::iterator MBBII,
  38                                    std::vector<CalleeSavedInfo> &CSI,
  39                                    const TargetRegisterInfo *TRI) const
  40     override;
  41   void processFunctionBeforeFrameFinalized(MachineFunction &MF,
  42                                            RegScavenger *RS) const override;
  43   void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
  44   void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
  45   bool hasFP(const MachineFunction &MF) const override;
  46   bool hasReservedCallFrame(const MachineFunction &MF) const override;
  47   MachineBasicBlock::iterator
  48   eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
  49                                 MachineBasicBlock::iterator MI) const override;
  50
  51   // Return the byte offset from the incoming stack pointer of Reg's
  52   // ABI-defined save slot.  Return 0 if no slot is defined for Reg.
  53   unsigned getRegSpillOffset(unsigned Reg) const {
  54     return RegSpillOffsets[Reg];
  55   }
  56 };
  57 } // end namespace llvm
  58
  59 #endif