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 "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, which
24 // 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(Symbol: Sym, specifier: X86::S_GOTPCREL, Ctx&: getContext());
29 const MCExpr *Four = MCConstantExpr::create(Value: 4, Ctx&: getContext());
30 return MCBinaryExpr::createAdd(LHS: Res, RHS: Four, Ctx&: 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 entry
47 // from a data section. In case there's an additional offset, then use
48 // foo@GOTPCREL+4+<offset>.
49 unsigned FinalOff = Offset+MV.getConstant()+4;
50 const MCExpr *Res =
51 MCSymbolRefExpr::create(Symbol: Sym, specifier: X86::S_GOTPCREL, Ctx&: getContext());
52 const MCExpr *Off = MCConstantExpr::create(Value: FinalOff, Ctx&: getContext());
53 return MCBinaryExpr::createAdd(LHS: Res, RHS: Off, Ctx&: 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(Symbol: Sym, specifier: X86::S_DTPOFF, Ctx&: 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(Symbol: Sym, specifier: X86::S_GOTPCREL, Ctx&: getContext());
71 const MCExpr *Off = MCConstantExpr::create(Value: FinalOffset, Ctx&: getContext());
72 return MCBinaryExpr::createAdd(LHS: Res, RHS: Off, Ctx&: getContext());
73}
74