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 "SystemZInstrBuilder.h" 14 #include "SystemZMachineFunctionInfo.h" 15 #include "llvm/ADT/IndexedMap.h" 16 #include "llvm/CodeGen/TargetFrameLowering.h" 17 #include "llvm/Support/TypeSize.h" 18 19 namespace llvm { 20 class SystemZTargetMachine; 21 class SystemZSubtarget; 22 23 class SystemZFrameLowering : public TargetFrameLowering { 24 public: 25 SystemZFrameLowering(StackDirection D, Align StackAl, int LAO, Align TransAl, 26 bool StackReal); 27 28 static std::unique_ptr<SystemZFrameLowering> 29 create(const SystemZSubtarget &STI); 30 31 // Override TargetFrameLowering. 32 bool isFPCloseToIncomingSP() const override { return false; } 33 bool hasReservedCallFrame(const MachineFunction &MF) const override; 34 MachineBasicBlock::iterator 35 eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB, 36 MachineBasicBlock::iterator MI) const override; 37 }; 38 39 class SystemZELFFrameLowering : public SystemZFrameLowering { 40 IndexedMap<unsigned> RegSpillOffsets; 41 42 public: 43 SystemZELFFrameLowering(); 44 45 // Override TargetFrameLowering. 46 bool isFPCloseToIncomingSP() const override { return false; } 47 bool 48 assignCalleeSavedSpillSlots(MachineFunction &MF, 49 const TargetRegisterInfo *TRI, 50 std::vector<CalleeSavedInfo> &CSI) const override; 51 void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs, 52 RegScavenger *RS) const override; 53 bool spillCalleeSavedRegisters(MachineBasicBlock &MBB, 54 MachineBasicBlock::iterator MBBI, 55 ArrayRef<CalleeSavedInfo> CSI, 56 const TargetRegisterInfo *TRI) const override; 57 bool 58 restoreCalleeSavedRegisters(MachineBasicBlock &MBB, 59 MachineBasicBlock::iterator MBBII, 60 MutableArrayRef<CalleeSavedInfo> CSI, 61 const TargetRegisterInfo *TRI) const override; 62 void processFunctionBeforeFrameFinalized(MachineFunction &MF, 63 RegScavenger *RS) const override; 64 void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override; 65 void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override; 66 void inlineStackProbe(MachineFunction &MF, 67 MachineBasicBlock &PrologMBB) const override; 68 bool hasFP(const MachineFunction &MF) const override; 69 StackOffset getFrameIndexReference(const MachineFunction &MF, int FI, 70 Register &FrameReg) const override; 71 72 // Return the byte offset from the incoming stack pointer of Reg's 73 // ABI-defined save slot. Return 0 if no slot is defined for Reg. Adjust 74 // the offset in case MF has packed-stack. 75 unsigned getRegSpillOffset(MachineFunction &MF, Register Reg) const; 76 77 bool usePackedStack(MachineFunction &MF) const; 78 79 // Return the offset of the backchain. 80 unsigned getBackchainOffset(MachineFunction &MF) const { 81 // The back chain is stored topmost with packed-stack. 82 return usePackedStack(MF) ? SystemZMC::ELFCallFrameSize - 8 : 0; 83 } 84 85 // Get or create the frame index of where the old frame pointer is stored. 86 int getOrCreateFramePointerSaveIndex(MachineFunction &MF) const; 87 }; 88 89 class SystemZXPLINKFrameLowering : public SystemZFrameLowering { 90 IndexedMap<unsigned> RegSpillOffsets; 91 92 public: 93 SystemZXPLINKFrameLowering(); 94 95 bool 96 assignCalleeSavedSpillSlots(MachineFunction &MF, 97 const TargetRegisterInfo *TRI, 98 std::vector<CalleeSavedInfo> &CSI) const override; 99 100 void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs, 101 RegScavenger *RS) const override; 102 103 bool spillCalleeSavedRegisters(MachineBasicBlock &MBB, 104 MachineBasicBlock::iterator MBBI, 105 ArrayRef<CalleeSavedInfo> CSI, 106 const TargetRegisterInfo *TRI) const override; 107 108 void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override; 109 110 void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override; 111 112 bool hasFP(const MachineFunction &MF) const override; 113 }; 114 } // end namespace llvm 115 116 #endif 117