57 lines
2.1 KiB
C++
57 lines
2.1 KiB
C++
//===-- CSKYFrameLowering.cpp - CSKY Frame Information ------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the CSKY implementation of TargetFrameLowering class.
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//
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//===----------------------------------------------------------------------===//
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#include "CSKYFrameLowering.h"
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#include "CSKYSubtarget.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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#include "llvm/CodeGen/RegisterScavenging.h"
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#include "llvm/IR/DiagnosticInfo.h"
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#include "llvm/MC/MCDwarf.h"
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using namespace llvm;
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#define DEBUG_TYPE "csky-frame-lowering"
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// Returns the register used to hold the frame pointer.
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static Register getFPReg(const CSKYSubtarget &STI) { return CSKY::R8; }
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// To avoid the BP value clobbered by a function call, we need to choose a
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// callee saved register to save the value.
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static Register getBPReg(const CSKYSubtarget &STI) { return CSKY::R7; }
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bool CSKYFrameLowering::hasFP(const MachineFunction &MF) const {
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const TargetRegisterInfo *RegInfo = MF.getSubtarget().getRegisterInfo();
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const MachineFrameInfo &MFI = MF.getFrameInfo();
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return MF.getTarget().Options.DisableFramePointerElim(MF) ||
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RegInfo->hasStackRealignment(MF) || MFI.hasVarSizedObjects() ||
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MFI.isFrameAddressTaken();
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}
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bool CSKYFrameLowering::hasBP(const MachineFunction &MF) const {
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const MachineFrameInfo &MFI = MF.getFrameInfo();
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return MFI.hasVarSizedObjects();
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}
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void CSKYFrameLowering::emitPrologue(MachineFunction &MF,
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MachineBasicBlock &MBB) const {
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// FIXME: Implement this when we have function calls
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}
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void CSKYFrameLowering::emitEpilogue(MachineFunction &MF,
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MachineBasicBlock &MBB) const {
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// FIXME: Implement this when we have function calls
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} |