1*81ad6265SDimitry Andric //===-- LoongArchFrameLowering.cpp - LoongArch Frame Information -*- C++ -*-==// 2*81ad6265SDimitry Andric // 3*81ad6265SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4*81ad6265SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 5*81ad6265SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6*81ad6265SDimitry Andric // 7*81ad6265SDimitry Andric //===----------------------------------------------------------------------===// 8*81ad6265SDimitry Andric // 9*81ad6265SDimitry Andric // This file contains the LoongArch implementation of TargetFrameLowering class. 10*81ad6265SDimitry Andric // 11*81ad6265SDimitry Andric //===----------------------------------------------------------------------===// 12*81ad6265SDimitry Andric 13*81ad6265SDimitry Andric #include "LoongArchFrameLowering.h" 14*81ad6265SDimitry Andric #include "LoongArchSubtarget.h" 15*81ad6265SDimitry Andric #include "llvm/CodeGen/MachineFrameInfo.h" 16*81ad6265SDimitry Andric #include "llvm/CodeGen/MachineFunction.h" 17*81ad6265SDimitry Andric #include "llvm/CodeGen/MachineInstrBuilder.h" 18*81ad6265SDimitry Andric #include "llvm/CodeGen/MachineRegisterInfo.h" 19*81ad6265SDimitry Andric #include "llvm/CodeGen/RegisterScavenging.h" 20*81ad6265SDimitry Andric #include "llvm/IR/DiagnosticInfo.h" 21*81ad6265SDimitry Andric #include "llvm/MC/MCDwarf.h" 22*81ad6265SDimitry Andric 23*81ad6265SDimitry Andric using namespace llvm; 24*81ad6265SDimitry Andric 25*81ad6265SDimitry Andric #define DEBUG_TYPE "loongarch-frame-lowering" 26*81ad6265SDimitry Andric 27*81ad6265SDimitry Andric // Return true if the specified function should have a dedicated frame 28*81ad6265SDimitry Andric // pointer register. This is true if frame pointer elimination is 29*81ad6265SDimitry Andric // disabled, if it needs dynamic stack realignment, if the function has 30*81ad6265SDimitry Andric // variable sized allocas, or if the frame address is taken. 31*81ad6265SDimitry Andric bool LoongArchFrameLowering::hasFP(const MachineFunction &MF) const { 32*81ad6265SDimitry Andric const TargetRegisterInfo *RegInfo = MF.getSubtarget().getRegisterInfo(); 33*81ad6265SDimitry Andric 34*81ad6265SDimitry Andric const MachineFrameInfo &MFI = MF.getFrameInfo(); 35*81ad6265SDimitry Andric return MF.getTarget().Options.DisableFramePointerElim(MF) || 36*81ad6265SDimitry Andric RegInfo->hasStackRealignment(MF) || MFI.hasVarSizedObjects() || 37*81ad6265SDimitry Andric MFI.isFrameAddressTaken(); 38*81ad6265SDimitry Andric } 39*81ad6265SDimitry Andric 40*81ad6265SDimitry Andric bool LoongArchFrameLowering::hasBP(const MachineFunction &MF) const { 41*81ad6265SDimitry Andric const MachineFrameInfo &MFI = MF.getFrameInfo(); 42*81ad6265SDimitry Andric const TargetRegisterInfo *TRI = STI.getRegisterInfo(); 43*81ad6265SDimitry Andric 44*81ad6265SDimitry Andric return MFI.hasVarSizedObjects() && TRI->hasStackRealignment(MF); 45*81ad6265SDimitry Andric } 46*81ad6265SDimitry Andric 47*81ad6265SDimitry Andric void LoongArchFrameLowering::emitPrologue(MachineFunction &MF, 48*81ad6265SDimitry Andric MachineBasicBlock &MBB) const { 49*81ad6265SDimitry Andric // TODO: Implement this when we have function calls 50*81ad6265SDimitry Andric } 51*81ad6265SDimitry Andric 52*81ad6265SDimitry Andric void LoongArchFrameLowering::emitEpilogue(MachineFunction &MF, 53*81ad6265SDimitry Andric MachineBasicBlock &MBB) const { 54*81ad6265SDimitry Andric // TODO: Implement this when we have function calls 55*81ad6265SDimitry Andric } 56