X86TargetObjectFile.cpp revision 341825 
1//===-- X86TargetObjectFile.cpp - X86 Object Info -------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10#include "X86TargetObjectFile.h"
11#include "llvm/ADT/StringExtras.h"
12#include "llvm/BinaryFormat/COFF.h"
13#include "llvm/BinaryFormat/Dwarf.h"
14#include "llvm/CodeGen/TargetLowering.h"
15#include "llvm/IR/Mangler.h"
16#include "llvm/IR/Operator.h"
17#include "llvm/MC/MCContext.h"
18#include "llvm/MC/MCExpr.h"
19#include "llvm/MC/MCSectionCOFF.h"
20#include "llvm/MC/MCSectionELF.h"
21#include "llvm/MC/MCValue.h"
22
23using namespace llvm;
24using namespace dwarf;
25
26const 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
44MCSymbol *X86_64MachoTargetObjectFile::getCFIPersonalitySymbol(
45    const GlobalValue *GV, const TargetMachine &TM,
46    MachineModuleInfo *MMI) const {
47  return TM.getSymbol(GV);
48}
49
50const MCExpr *X86_64MachoTargetObjectFile::getIndirectSymViaGOTPCRel(
51    const MCSymbol *Sym, const MCValue &MV, int64_t Offset,
52    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
63const MCExpr *X86ELFTargetObjectFile::getDebugThreadLocalSymbol(
64    const MCSymbol *Sym) const {
65  return MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_DTPOFF, getContext());
66}
67
68void
69X86FreeBSDTargetObjectFile::Initialize(MCContext &Ctx,
70                                       const TargetMachine &TM) {
71  TargetLoweringObjectFileELF::Initialize(Ctx, TM);
72  InitializeELF(TM.Options.UseInitArray);
73}
74
75void
76X86FuchsiaTargetObjectFile::Initialize(MCContext &Ctx,
77                                       const TargetMachine &TM) {
78  TargetLoweringObjectFileELF::Initialize(Ctx, TM);
79  InitializeELF(TM.Options.UseInitArray);
80}
81
82void
83X86LinuxNaClTargetObjectFile::Initialize(MCContext &Ctx,
84                                         const TargetMachine &TM) {
85  TargetLoweringObjectFileELF::Initialize(Ctx, TM);
86  InitializeELF(TM.Options.UseInitArray);
87}
88
89void X86SolarisTargetObjectFile::Initialize(MCContext &Ctx,
90                                            const TargetMachine &TM) {
91  TargetLoweringObjectFileELF::Initialize(Ctx, TM);
92  InitializeELF(TM.Options.UseInitArray);
93}
94