lib/Target/X86/X86TargetObjectFile.cpp

   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
  22 using namespace llvm;
  23 using namespace dwarf;
  24
  25 const MCExpr *X86_64MachoTargetObjectFile::getTTypeGlobalReference(
  26     const GlobalValue *GV, unsigned Encoding, const TargetMachine &TM,
  27     MachineModuleInfo *MMI, MCStreamer &Streamer) const {
  28
  29   // On Darwin/X86-64, we can reference dwarf symbols with foo@GOTPCREL+4, which
  30   // is an indirect pc-relative reference.
  31   if ((Encoding & DW_EH_PE_indirect) && (Encoding & DW_EH_PE_pcrel)) {
  32     const MCSymbol *Sym = TM.getSymbol(GV);
  33     const MCExpr *Res =
  34       MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_GOTPCREL, getContext());
  35     const MCExpr *Four = MCConstantExpr::create(4, getContext());
  36     return MCBinaryExpr::createAdd(Res, Four, getContext());
  37   }
  38
  39   return TargetLoweringObjectFileMachO::getTTypeGlobalReference(
  40       GV, Encoding, TM, MMI, Streamer);
  41 }
  42
  43 MCSymbol *X86_64MachoTargetObjectFile::getCFIPersonalitySymbol(
  44     const GlobalValue *GV, const TargetMachine &TM,
  45     MachineModuleInfo *MMI) const {
  46   return TM.getSymbol(GV);
  47 }
  48
  49 const MCExpr *X86_64MachoTargetObjectFile::getIndirectSymViaGOTPCRel(
  50     const MCSymbol *Sym, const MCValue &MV, int64_t Offset,
  51     MachineModuleInfo *MMI, MCStreamer &Streamer) const {
  52   // On Darwin/X86-64, we need to use foo@GOTPCREL+4 to access the got entry
  53   // from a data section. In case there's an additional offset, then use
  54   // foo@GOTPCREL+4+<offset>.
  55   unsigned FinalOff = Offset+MV.getConstant()+4;
  56   const MCExpr *Res =
  57     MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_GOTPCREL, getContext());
  58   const MCExpr *Off = MCConstantExpr::create(FinalOff, getContext());
  59   return MCBinaryExpr::createAdd(Res, Off, getContext());
  60 }
  61
  62 const MCExpr *X86ELFTargetObjectFile::getDebugThreadLocalSymbol(
  63     const MCSymbol *Sym) const {
  64   return MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_DTPOFF, getContext());
  65 }
  66
  67 void
  68 X86FreeBSDTargetObjectFile::Initialize(MCContext &Ctx,
  69                                        const TargetMachine &TM) {
  70   TargetLoweringObjectFileELF::Initialize(Ctx, TM);
  71   InitializeELF(TM.Options.UseInitArray);
  72 }
  73
  74 void
  75 X86FuchsiaTargetObjectFile::Initialize(MCContext &Ctx,
  76                                        const TargetMachine &TM) {
  77   TargetLoweringObjectFileELF::Initialize(Ctx, TM);
  78   InitializeELF(TM.Options.UseInitArray);
  79 }
  80
  81 void
  82 X86LinuxNaClTargetObjectFile::Initialize(MCContext &Ctx,
  83                                          const TargetMachine &TM) {
  84   TargetLoweringObjectFileELF::Initialize(Ctx, TM);
  85   InitializeELF(TM.Options.UseInitArray);
  86 }
  87
  88 void X86SolarisTargetObjectFile::Initialize(MCContext &Ctx,
  89                                             const TargetMachine &TM) {
  90   TargetLoweringObjectFileELF::Initialize(Ctx, TM);
  91   InitializeELF(TM.Options.UseInitArray);
  92 }