74 lines · cpp
1//===-- X86TargetObjectFile.cpp - X86 Object Info -------------------------===//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-exception6//7//===----------------------------------------------------------------------===//8 9#include "X86TargetObjectFile.h"10#include "MCTargetDesc/X86MCAsmInfo.h"11#include "llvm/BinaryFormat/Dwarf.h"12#include "llvm/MC/MCExpr.h"13#include "llvm/MC/MCValue.h"14#include "llvm/Target/TargetMachine.h"15 16using namespace llvm;17using namespace dwarf;18 19const MCExpr *X86_64MachoTargetObjectFile::getTTypeGlobalReference(20 const GlobalValue *GV, unsigned Encoding, const TargetMachine &TM,21 MachineModuleInfo *MMI, MCStreamer &Streamer) const {22 23 // On Darwin/X86-64, we can reference dwarf symbols with foo@GOTPCREL+4, which24 // is an indirect pc-relative reference.25 if ((Encoding & DW_EH_PE_indirect) && (Encoding & DW_EH_PE_pcrel)) {26 const MCSymbol *Sym = TM.getSymbol(GV);27 const MCExpr *Res =28 MCSymbolRefExpr::create(Sym, X86::S_GOTPCREL, getContext());29 const MCExpr *Four = MCConstantExpr::create(4, getContext());30 return MCBinaryExpr::createAdd(Res, Four, getContext());31 }32 33 return TargetLoweringObjectFileMachO::getTTypeGlobalReference(34 GV, Encoding, TM, MMI, Streamer);35}36 37MCSymbol *X86_64MachoTargetObjectFile::getCFIPersonalitySymbol(38 const GlobalValue *GV, const TargetMachine &TM,39 MachineModuleInfo *MMI) const {40 return TM.getSymbol(GV);41}42 43const MCExpr *X86_64MachoTargetObjectFile::getIndirectSymViaGOTPCRel(44 const GlobalValue *GV, const MCSymbol *Sym, const MCValue &MV,45 int64_t Offset, MachineModuleInfo *MMI, MCStreamer &Streamer) const {46 // On Darwin/X86-64, we need to use foo@GOTPCREL+4 to access the got entry47 // from a data section. In case there's an additional offset, then use48 // foo@GOTPCREL+4+<offset>.49 unsigned FinalOff = Offset+MV.getConstant()+4;50 const MCExpr *Res =51 MCSymbolRefExpr::create(Sym, X86::S_GOTPCREL, getContext());52 const MCExpr *Off = MCConstantExpr::create(FinalOff, getContext());53 return MCBinaryExpr::createAdd(Res, Off, getContext());54}55 56X86ELFTargetObjectFile::X86ELFTargetObjectFile() {57 PLTRelativeSpecifier = X86::S_PLT;58}59 60const MCExpr *X86ELFTargetObjectFile::getDebugThreadLocalSymbol(61 const MCSymbol *Sym) const {62 return MCSymbolRefExpr::create(Sym, X86::S_DTPOFF, getContext());63}64 65const MCExpr *X86_64ELFTargetObjectFile::getIndirectSymViaGOTPCRel(66 const GlobalValue *GV, const MCSymbol *Sym, const MCValue &MV,67 int64_t Offset, MachineModuleInfo *MMI, MCStreamer &Streamer) const {68 int64_t FinalOffset = Offset + MV.getConstant();69 const MCExpr *Res =70 MCSymbolRefExpr::create(Sym, X86::S_GOTPCREL, getContext());71 const MCExpr *Off = MCConstantExpr::create(FinalOffset, getContext());72 return MCBinaryExpr::createAdd(Res, Off, getContext());73}74