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
getTTypeGlobalReference(const GlobalValue * GV,unsigned Encoding,const TargetMachine & TM,MachineModuleInfo * MMI,MCStreamer & Streamer) const18 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
getCFIPersonalitySymbol(const GlobalValue * GV,const TargetMachine & TM,MachineModuleInfo * MMI) const36 MCSymbol *X86_64MachoTargetObjectFile::getCFIPersonalitySymbol(
37 const GlobalValue *GV, const TargetMachine &TM,
38 MachineModuleInfo *MMI) const {
39 return TM.getSymbol(GV);
40 }
41
getIndirectSymViaGOTPCRel(const GlobalValue * GV,const MCSymbol * Sym,const MCValue & MV,int64_t Offset,MachineModuleInfo * MMI,MCStreamer & Streamer) const42 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
getDebugThreadLocalSymbol(const MCSymbol * Sym) const55 const MCExpr *X86ELFTargetObjectFile::getDebugThreadLocalSymbol(
56 const MCSymbol *Sym) const {
57 return MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_DTPOFF, getContext());
58 }
59