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//===-- 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::ELFCallFrameSize - 8 : 0;
}
};
} // end namespace llvm
#endif
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