lib/Target/SystemZ/SystemZFrameLowering.h

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