lib/Target/X86/X86TargetObjectFile.cpp

   1 //===-- llvm/Target/X86/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 "X86MCTargetExpr.h"
  11 #include "X86TargetObjectFile.h"
  12 #include "X86TargetMachine.h"
  13 #include "llvm/CodeGen/MachineModuleInfoImpls.h"
  14 #include "llvm/MC/MCContext.h"
  15 #include "llvm/Target/Mangler.h"
  16 #include "llvm/ADT/SmallString.h"
  17 #include "llvm/Support/Dwarf.h"
  18 using namespace llvm;
  19 using namespace dwarf;
  20
  21 const MCExpr *X8664_MachoTargetObjectFile::
  22 getSymbolForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
  23                                  MachineModuleInfo *MMI,
  24                                  unsigned Encoding) const {
  25
  26   // On Darwin/X86-64, we can reference dwarf symbols with foo@GOTPCREL+4, which
  27   // is an indirect pc-relative reference.
  28   if (Encoding & (DW_EH_PE_indirect | DW_EH_PE_pcrel)) {
  29     SmallString<128> Name;
  30     Mang->getNameWithPrefix(Name, GV, false);
  31     const MCSymbol *Sym;
  32     if (GV->hasPrivateLinkage())
  33       Sym = getContext().GetOrCreateTemporarySymbol(Name);
  34     else
  35       Sym = getContext().GetOrCreateSymbol(Name);
  36     const MCExpr *Res =
  37       X86MCTargetExpr::Create(Sym, X86MCTargetExpr::GOTPCREL, getContext());
  38     const MCExpr *Four = MCConstantExpr::Create(4, getContext());
  39     return MCBinaryExpr::CreateAdd(Res, Four, getContext());
  40   }
  41
  42   return TargetLoweringObjectFileMachO::
  43     getSymbolForDwarfGlobalReference(GV, Mang, MMI, Encoding);
  44 }
  45
  46 unsigned X8632_ELFTargetObjectFile::getPersonalityEncoding() const {
  47   if (TM.getRelocationModel() == Reloc::PIC_)
  48     return DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4;
  49   else
  50     return DW_EH_PE_absptr;
  51 }
  52
  53 unsigned X8632_ELFTargetObjectFile::getLSDAEncoding() const {
  54   if (TM.getRelocationModel() == Reloc::PIC_)
  55     return DW_EH_PE_pcrel | DW_EH_PE_sdata4;
  56   else
  57     return DW_EH_PE_absptr;
  58 }
  59
  60 unsigned X8632_ELFTargetObjectFile::getFDEEncoding() const {
  61   if (TM.getRelocationModel() == Reloc::PIC_)
  62     return DW_EH_PE_pcrel | DW_EH_PE_sdata4;
  63   else
  64     return DW_EH_PE_absptr;
  65 }
  66
  67 unsigned X8632_ELFTargetObjectFile::getTTypeEncoding() const {
  68   if (TM.getRelocationModel() == Reloc::PIC_)
  69     return DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4;
  70   else
  71     return DW_EH_PE_absptr;
  72 }
  73
  74 unsigned X8664_ELFTargetObjectFile::getPersonalityEncoding() const {
  75   CodeModel::Model Model = TM.getCodeModel();
  76   if (TM.getRelocationModel() == Reloc::PIC_)
  77     return DW_EH_PE_indirect | DW_EH_PE_pcrel | (Model == CodeModel::Small ||
  78                                                  Model == CodeModel::Medium ?
  79                                             DW_EH_PE_sdata4 : DW_EH_PE_sdata8);
  80
  81   if (Model == CodeModel::Small || Model == CodeModel::Medium)
  82     return DW_EH_PE_udata4;
  83
  84   return DW_EH_PE_absptr;
  85 }
  86
  87 unsigned X8664_ELFTargetObjectFile::getLSDAEncoding() const {
  88   CodeModel::Model Model = TM.getCodeModel();
  89   if (TM.getRelocationModel() == Reloc::PIC_)
  90     return DW_EH_PE_pcrel | (Model == CodeModel::Small ?
  91                              DW_EH_PE_sdata4 : DW_EH_PE_sdata8);
  92
  93   if (Model == CodeModel::Small)
  94     return DW_EH_PE_udata4;
  95
  96   return DW_EH_PE_absptr;
  97 }
  98
  99 unsigned X8664_ELFTargetObjectFile::getFDEEncoding() const {
 100   CodeModel::Model Model = TM.getCodeModel();
 101   if (TM.getRelocationModel() == Reloc::PIC_)
 102     return DW_EH_PE_pcrel | (Model == CodeModel::Small ||
 103                              Model == CodeModel::Medium ?
 104                              DW_EH_PE_sdata4 : DW_EH_PE_sdata8);
 105
 106   if (Model == CodeModel::Small || Model == CodeModel::Medium)
 107     return DW_EH_PE_udata4;
 108
 109   return DW_EH_PE_absptr;
 110 }
 111
 112 unsigned X8664_ELFTargetObjectFile::getTTypeEncoding() const {
 113   CodeModel::Model Model = TM.getCodeModel();
 114   if (TM.getRelocationModel() == Reloc::PIC_)
 115     return DW_EH_PE_indirect | DW_EH_PE_pcrel | (Model == CodeModel::Small ||
 116                                                  Model == CodeModel::Medium ?
 117                                             DW_EH_PE_sdata4 : DW_EH_PE_sdata8);
 118
 119   if (Model == CodeModel::Small)
 120     return DW_EH_PE_udata4;
 121
 122   return DW_EH_PE_absptr;
 123 }