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 "MCTargetDesc/SystemZMCTargetDesc.h" 13 #include "llvm/ADT/IndexedMap.h" 14 #include "llvm/CodeGen/TargetFrameLowering.h" 15 #include "llvm/Support/TypeSize.h" 16 17 namespace llvm { 18 class SystemZTargetMachine; 19 class SystemZSubtarget; 20 21 class SystemZFrameLowering : public TargetFrameLowering { 22 23 public: 24 SystemZFrameLowering(StackDirection D, Align StackAl, int LAO, Align TransAl, 25 bool StackReal); 26 27 static std::unique_ptr<SystemZFrameLowering> 28 create(const SystemZSubtarget &STI); 29 30 // Override TargetFrameLowering. isFPCloseToIncomingSP()31 bool isFPCloseToIncomingSP() const override { return false; } 32 bool hasReservedCallFrame(const MachineFunction &MF) const override; 33 MachineBasicBlock::iterator 34 eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB, 35 MachineBasicBlock::iterator MI) const override; 36 }; 37 38 class SystemZELFFrameLowering : public SystemZFrameLowering { 39 IndexedMap<unsigned> RegSpillOffsets; 40 41 public: 42 SystemZELFFrameLowering(); 43 44 // Override TargetFrameLowering. isFPCloseToIncomingSP()45 bool isFPCloseToIncomingSP() const override { return false; } 46 bool 47 assignCalleeSavedSpillSlots(MachineFunction &MF, 48 const TargetRegisterInfo *TRI, 49 std::vector<CalleeSavedInfo> &CSI) const override; 50 void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs, 51 RegScavenger *RS) const override; 52 bool spillCalleeSavedRegisters(MachineBasicBlock &MBB, 53 MachineBasicBlock::iterator MBBI, 54 ArrayRef<CalleeSavedInfo> CSI, 55 const TargetRegisterInfo *TRI) const override; 56 bool 57 restoreCalleeSavedRegisters(MachineBasicBlock &MBB, 58 MachineBasicBlock::iterator MBBII, 59 MutableArrayRef<CalleeSavedInfo> CSI, 60 const TargetRegisterInfo *TRI) const override; 61 void processFunctionBeforeFrameFinalized(MachineFunction &MF, 62 RegScavenger *RS) const override; 63 void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override; 64 void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override; 65 void inlineStackProbe(MachineFunction &MF, 66 MachineBasicBlock &PrologMBB) const override; 67 bool hasFP(const MachineFunction &MF) const override; 68 StackOffset getFrameIndexReference(const MachineFunction &MF, int FI, 69 Register &FrameReg) const override; 70 71 // Return the byte offset from the incoming stack pointer of Reg's 72 // ABI-defined save slot. Return 0 if no slot is defined for Reg. Adjust 73 // the offset in case MF has packed-stack. 74 unsigned getRegSpillOffset(MachineFunction &MF, Register Reg) const; 75 76 bool usePackedStack(MachineFunction &MF) const; 77 78 // Return the offset of the backchain. getBackchainOffset(MachineFunction & MF)79 unsigned getBackchainOffset(MachineFunction &MF) const { 80 // The back chain is stored topmost with packed-stack. 81 return usePackedStack(MF) ? SystemZMC::ELFCallFrameSize - 8 : 0; 82 } 83 84 // Get or create the frame index of where the old frame pointer is stored. 85 int getOrCreateFramePointerSaveIndex(MachineFunction &MF) const; 86 }; 87 88 class SystemZXPLINKFrameLowering : public SystemZFrameLowering { 89 public: 90 SystemZXPLINKFrameLowering(); 91 92 void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override; 93 94 void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override; 95 96 bool hasFP(const MachineFunction &MF) const override; 97 }; 98 } // end namespace llvm 99 100 #endif 101