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-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "X86TargetObjectFile.h" 10 #include "llvm/BinaryFormat/Dwarf.h" 11 #include "llvm/MC/MCExpr.h" 12 #include "llvm/MC/MCValue.h" 13 #include "llvm/Target/TargetMachine.h" 14 15 using namespace llvm; 16 using namespace dwarf; 17 18 const MCExpr *X86_64MachoTargetObjectFile::getTTypeGlobalReference( 19 const GlobalValue *GV, unsigned Encoding, const TargetMachine &TM, 20 MachineModuleInfo *MMI, MCStreamer &Streamer) const { 21 22 // On Darwin/X86-64, we can reference dwarf symbols with foo@GOTPCREL+4, which 23 // is an indirect pc-relative reference. 24 if ((Encoding & DW_EH_PE_indirect) && (Encoding & DW_EH_PE_pcrel)) { 25 const MCSymbol *Sym = TM.getSymbol(GV); 26 const MCExpr *Res = 27 MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_GOTPCREL, getContext()); 28 const MCExpr *Four = MCConstantExpr::create(4, getContext()); 29 return MCBinaryExpr::createAdd(Res, Four, getContext()); 30 } 31 32 return TargetLoweringObjectFileMachO::getTTypeGlobalReference( 33 GV, Encoding, TM, MMI, Streamer); 34 } 35 36 MCSymbol *X86_64MachoTargetObjectFile::getCFIPersonalitySymbol( 37 const GlobalValue *GV, const TargetMachine &TM, 38 MachineModuleInfo *MMI) const { 39 return TM.getSymbol(GV); 40 } 41 42 const MCExpr *X86_64MachoTargetObjectFile::getIndirectSymViaGOTPCRel( 43 const GlobalValue *GV, const MCSymbol *Sym, const MCValue &MV, 44 int64_t Offset, MachineModuleInfo *MMI, MCStreamer &Streamer) const { 45 // On Darwin/X86-64, we need to use foo@GOTPCREL+4 to access the got entry 46 // from a data section. In case there's an additional offset, then use 47 // foo@GOTPCREL+4+<offset>. 48 unsigned FinalOff = Offset+MV.getConstant()+4; 49 const MCExpr *Res = 50 MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_GOTPCREL, getContext()); 51 const MCExpr *Off = MCConstantExpr::create(FinalOff, getContext()); 52 return MCBinaryExpr::createAdd(Res, Off, getContext()); 53 } 54 55 const MCExpr *X86ELFTargetObjectFile::getDebugThreadLocalSymbol( 56 const MCSymbol *Sym) const { 57 return MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_DTPOFF, getContext()); 58 } 59