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 SYSTEMZFRAMELOWERING_H 11 #define SYSTEMZFRAMELOWERING_H 12 13 #include "llvm/ADT/IndexedMap.h" 14 #include "llvm/Target/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 processFunctionBeforeCalleeSavedScan(MachineFunction &MF, 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 const 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) const override; 44 void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override; 45 bool hasFP(const MachineFunction &MF) const override; 46 int getFrameIndexOffset(const MachineFunction &MF, int FI) const override; 47 bool hasReservedCallFrame(const MachineFunction &MF) const override; 48 void eliminateCallFramePseudoInstr(MachineFunction &MF, 49 MachineBasicBlock &MBB, 50 MachineBasicBlock::iterator MI) const 51 override; 52 53 // Return the number of bytes in the callee-allocated part of the frame. 54 uint64_t getAllocatedStackSize(const MachineFunction &MF) const; 55 56 // Return the byte offset from the incoming stack pointer of Reg's 57 // ABI-defined save slot. Return 0 if no slot is defined for Reg. 58 unsigned getRegSpillOffset(unsigned Reg) const { 59 return RegSpillOffsets[Reg]; 60 } 61 }; 62 } // end namespace llvm 63 64 #endif 65
