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/ADT/StringExtras.h" 11 #include "llvm/BinaryFormat/COFF.h" 12 #include "llvm/BinaryFormat/Dwarf.h" 13 #include "llvm/CodeGen/TargetLowering.h" 14 #include "llvm/IR/Mangler.h" 15 #include "llvm/IR/Operator.h" 16 #include "llvm/MC/MCContext.h" 17 #include "llvm/MC/MCExpr.h" 18 #include "llvm/MC/MCSectionCOFF.h" 19 #include "llvm/MC/MCSectionELF.h" 20 #include "llvm/MC/MCValue.h" 21 #include "llvm/Target/TargetMachine.h" 22 23 using namespace llvm; 24 using namespace dwarf; 25 26 const MCExpr *X86_64MachoTargetObjectFile::getTTypeGlobalReference( 27 const GlobalValue *GV, unsigned Encoding, const TargetMachine &TM, 28 MachineModuleInfo *MMI, MCStreamer &Streamer) const { 29 30 // On Darwin/X86-64, we can reference dwarf symbols with foo@GOTPCREL+4, which 31 // is an indirect pc-relative reference. 32 if ((Encoding & DW_EH_PE_indirect) && (Encoding & DW_EH_PE_pcrel)) { 33 const MCSymbol *Sym = TM.getSymbol(GV); 34 const MCExpr *Res = 35 MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_GOTPCREL, getContext()); 36 const MCExpr *Four = MCConstantExpr::create(4, getContext()); 37 return MCBinaryExpr::createAdd(Res, Four, getContext()); 38 } 39 40 return TargetLoweringObjectFileMachO::getTTypeGlobalReference( 41 GV, Encoding, TM, MMI, Streamer); 42 } 43 44 MCSymbol *X86_64MachoTargetObjectFile::getCFIPersonalitySymbol( 45 const GlobalValue *GV, const TargetMachine &TM, 46 MachineModuleInfo *MMI) const { 47 return TM.getSymbol(GV); 48 } 49 50 const MCExpr *X86_64MachoTargetObjectFile::getIndirectSymViaGOTPCRel( 51 const GlobalValue *GV, const MCSymbol *Sym, const MCValue &MV, 52 int64_t Offset, MachineModuleInfo *MMI, MCStreamer &Streamer) const { 53 // On Darwin/X86-64, we need to use foo@GOTPCREL+4 to access the got entry 54 // from a data section. In case there's an additional offset, then use 55 // foo@GOTPCREL+4+<offset>. 56 unsigned FinalOff = Offset+MV.getConstant()+4; 57 const MCExpr *Res = 58 MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_GOTPCREL, getContext()); 59 const MCExpr *Off = MCConstantExpr::create(FinalOff, getContext()); 60 return MCBinaryExpr::createAdd(Res, Off, getContext()); 61 } 62 63 const MCExpr *X86ELFTargetObjectFile::getDebugThreadLocalSymbol( 64 const MCSymbol *Sym) const { 65 return MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_DTPOFF, getContext()); 66 } 67