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 IndexedMap<unsigned> RegSpillOffsets; 23 24 public: 25 SystemZFrameLowering(); 26 27 // Override TargetFrameLowering. 28 bool isFPCloseToIncomingSP() const override { return false; } 29 bool 30 assignCalleeSavedSpillSlots(MachineFunction &MF, 31 const TargetRegisterInfo *TRI, 32 std::vector<CalleeSavedInfo> &CSI) const override; 33 void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs, 34 RegScavenger *RS) const override; 35 bool spillCalleeSavedRegisters(MachineBasicBlock &MBB, 36 MachineBasicBlock::iterator MBBI, 37 ArrayRef<CalleeSavedInfo> CSI, 38 const TargetRegisterInfo *TRI) const override; 39 bool 40 restoreCalleeSavedRegisters(MachineBasicBlock &MBB, 41 MachineBasicBlock::iterator MBBII, 42 MutableArrayRef<CalleeSavedInfo> CSI, 43 const TargetRegisterInfo *TRI) const override; 44 void processFunctionBeforeFrameFinalized(MachineFunction &MF, 45 RegScavenger *RS) const override; 46 void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override; 47 void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override; 48 void inlineStackProbe(MachineFunction &MF, 49 MachineBasicBlock &PrologMBB) const override; 50 bool hasFP(const MachineFunction &MF) const override; 51 bool hasReservedCallFrame(const MachineFunction &MF) const override; 52 StackOffset getFrameIndexReference(const MachineFunction &MF, int FI, 53 Register &FrameReg) const override; 54 MachineBasicBlock::iterator 55 eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB, 56 MachineBasicBlock::iterator MI) const override; 57 58 // Return the byte offset from the incoming stack pointer of Reg's 59 // ABI-defined save slot. Return 0 if no slot is defined for Reg. Adjust 60 // the offset in case MF has packed-stack. 61 unsigned getRegSpillOffset(MachineFunction &MF, Register Reg) const; 62 63 // Get or create the frame index of where the old frame pointer is stored. 64 int getOrCreateFramePointerSaveIndex(MachineFunction &MF) const; 65 66 bool usePackedStack(MachineFunction &MF) const; 67 68 // Return the offset of the backchain. 69 unsigned getBackchainOffset(MachineFunction &MF) const { 70 // The back chain is stored topmost with packed-stack. 71 return usePackedStack(MF) ? SystemZMC::CallFrameSize - 8 : 0; 72 } 73 }; 74 } // end namespace llvm 75 76 #endif 77