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 59