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
getTTypeGlobalReference(const GlobalValue * GV,unsigned Encoding,const TargetMachine & TM,MachineModuleInfo * MMI,MCStreamer & Streamer) const26 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
getCFIPersonalitySymbol(const GlobalValue * GV,const TargetMachine & TM,MachineModuleInfo * MMI) const44 MCSymbol *X86_64MachoTargetObjectFile::getCFIPersonalitySymbol(
45 const GlobalValue *GV, const TargetMachine &TM,
46 MachineModuleInfo *MMI) const {
47 return TM.getSymbol(GV);
48 }
49
getIndirectSymViaGOTPCRel(const GlobalValue * GV,const MCSymbol * Sym,const MCValue & MV,int64_t Offset,MachineModuleInfo * MMI,MCStreamer & Streamer) const50 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
getDebugThreadLocalSymbol(const MCSymbol * Sym) const63 const MCExpr *X86ELFTargetObjectFile::getDebugThreadLocalSymbol(
64 const MCSymbol *Sym) const {
65 return MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_DTPOFF, getContext());
66 }
67