lib/Target/X86/X86TargetObjectFile.cpp

   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
  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 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
  63 const MCExpr *X86ELFTargetObjectFile::getDebugThreadLocalSymbol(
  64     const MCSymbol *Sym) const {
  65   return MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_DTPOFF, getContext());
  66 }
  67
  68 void
  69 X86FreeBSDTargetObjectFile::Initialize(MCContext &Ctx,
  70                                        const TargetMachine &TM) {
  71   TargetLoweringObjectFileELF::Initialize(Ctx, TM);
  72   InitializeELF(TM.Options.UseInitArray);
  73 }
  74
  75 void
  76 X86FuchsiaTargetObjectFile::Initialize(MCContext &Ctx,
  77                                        const TargetMachine &TM) {
  78   TargetLoweringObjectFileELF::Initialize(Ctx, TM);
  79   InitializeELF(TM.Options.UseInitArray);
  80 }
  81
  82 void
  83 X86LinuxNaClTargetObjectFile::Initialize(MCContext &Ctx,
  84                                          const TargetMachine &TM) {
  85   TargetLoweringObjectFileELF::Initialize(Ctx, TM);
  86   InitializeELF(TM.Options.UseInitArray);
  87 }
  88
  89 void X86SolarisTargetObjectFile::Initialize(MCContext &Ctx,
  90                                             const TargetMachine &TM) {
  91   TargetLoweringObjectFileELF::Initialize(Ctx, TM);
  92   InitializeELF(TM.Options.UseInitArray);
  93 }