| //===-- SystemZFrameLowering.h - Frame lowering for SystemZ -----*- C++ -*-===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZFRAMELOWERING_H |
| #define LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZFRAMELOWERING_H |
| |
| #include "MCTargetDesc/SystemZMCTargetDesc.h" |
| #include "llvm/ADT/IndexedMap.h" |
| #include "llvm/CodeGen/TargetFrameLowering.h" |
| #include "llvm/Support/TypeSize.h" |
| |
| namespace llvm { |
| class SystemZTargetMachine; |
| class SystemZSubtarget; |
| |
| class SystemZFrameLowering : public TargetFrameLowering { |
| IndexedMap<unsigned> RegSpillOffsets; |
| |
| public: |
| SystemZFrameLowering(); |
| |
| // Override TargetFrameLowering. |
| bool isFPCloseToIncomingSP() const override { return false; } |
| bool |
| assignCalleeSavedSpillSlots(MachineFunction &MF, |
| const TargetRegisterInfo *TRI, |
| std::vector<CalleeSavedInfo> &CSI) const override; |
| void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs, |
| RegScavenger *RS) const override; |
| bool spillCalleeSavedRegisters(MachineBasicBlock &MBB, |
| MachineBasicBlock::iterator MBBI, |
| ArrayRef<CalleeSavedInfo> CSI, |
| const TargetRegisterInfo *TRI) const override; |
| bool |
| restoreCalleeSavedRegisters(MachineBasicBlock &MBB, |
| MachineBasicBlock::iterator MBBII, |
| MutableArrayRef<CalleeSavedInfo> CSI, |
| const TargetRegisterInfo *TRI) const override; |
| void processFunctionBeforeFrameFinalized(MachineFunction &MF, |
| RegScavenger *RS) const override; |
| void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override; |
| void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override; |
| void inlineStackProbe(MachineFunction &MF, |
| MachineBasicBlock &PrologMBB) const override; |
| bool hasFP(const MachineFunction &MF) const override; |
| bool hasReservedCallFrame(const MachineFunction &MF) const override; |
| StackOffset getFrameIndexReference(const MachineFunction &MF, int FI, |
| Register &FrameReg) const override; |
| MachineBasicBlock::iterator |
| eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB, |
| MachineBasicBlock::iterator MI) const override; |
| |
| // Return the byte offset from the incoming stack pointer of Reg's |
| // ABI-defined save slot. Return 0 if no slot is defined for Reg. Adjust |
| // the offset in case MF has packed-stack. |
| unsigned getRegSpillOffset(MachineFunction &MF, Register Reg) const; |
| |
| // Get or create the frame index of where the old frame pointer is stored. |
| int getOrCreateFramePointerSaveIndex(MachineFunction &MF) const; |
| |
| bool usePackedStack(MachineFunction &MF) const; |
| |
| // Return the offset of the backchain. |
| unsigned getBackchainOffset(MachineFunction &MF) const { |
| // The back chain is stored topmost with packed-stack. |
| return usePackedStack(MF) ? SystemZMC::CallFrameSize - 8 : 0; |
| } |
| }; |
| } // end namespace llvm |
| |
| #endif |