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 *X8632_MachoTargetObjectFile::
  22 getSymbolForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
  23                              MachineModuleInfo *MMI, unsigned Encoding) const {
  24   // The mach-o version of this method defaults to returning a stub reference.
  25
  26   if (Encoding & DW_EH_PE_indirect) {
  27     MachineModuleInfoMachO &MachOMMI =
  28       MMI->getObjFileInfo<MachineModuleInfoMachO>();
  29
  30     SmallString<128> Name;
  31     Mang->getNameWithPrefix(Name, GV, true);
  32     Name += "$non_lazy_ptr";
  33
  34     // Add information about the stub reference to MachOMMI so that the stub
  35     // gets emitted by the asmprinter.
  36     MCSymbol *Sym = getContext().GetOrCreateSymbol(Name.str());
  37     MCSymbol *&StubSym = MachOMMI.getGVStubEntry(Sym);
  38     if (StubSym == 0) {
  39       Name.clear();
  40       Mang->getNameWithPrefix(Name, GV, false);
  41       StubSym = getContext().GetOrCreateSymbol(Name.str());
  42     }
  43
  44     return TargetLoweringObjectFile::
  45       getSymbolForDwarfReference(Sym, MMI,
  46                                  Encoding & ~dwarf::DW_EH_PE_indirect);
  47   }
  48
  49   return TargetLoweringObjectFileMachO::
  50     getSymbolForDwarfGlobalReference(GV, Mang, MMI, Encoding);
  51 }
  52
  53 const MCExpr *X8664_MachoTargetObjectFile::
  54 getSymbolForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
  55                            MachineModuleInfo *MMI, unsigned Encoding) const {
  56
  57   // On Darwin/X86-64, we can reference dwarf symbols with foo@GOTPCREL+4, which
  58   // is an indirect pc-relative reference.
  59   if (Encoding & (DW_EH_PE_indirect | DW_EH_PE_pcrel)) {
  60     SmallString<128> Name;
  61     Mang->getNameWithPrefix(Name, GV, false);
  62     const MCSymbol *Sym = getContext().GetOrCreateSymbol(Name);
  63     const MCExpr *Res =
  64       X86MCTargetExpr::Create(Sym, X86MCTargetExpr::GOTPCREL, getContext());
  65     const MCExpr *Four = MCConstantExpr::Create(4, getContext());
  66     return MCBinaryExpr::CreateAdd(Res, Four, getContext());
  67   }
  68
  69   return TargetLoweringObjectFileMachO::
  70     getSymbolForDwarfGlobalReference(GV, Mang, MMI, Encoding);
  71 }
  72
  73 unsigned X8632_ELFTargetObjectFile::getPersonalityEncoding() const {
  74   if (TM.getRelocationModel() == Reloc::PIC_)
  75     return DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4;
  76   else
  77     return DW_EH_PE_absptr;
  78 }
  79
  80 unsigned X8632_ELFTargetObjectFile::getLSDAEncoding() const {
  81   if (TM.getRelocationModel() == Reloc::PIC_)
  82     return DW_EH_PE_pcrel | DW_EH_PE_sdata4;
  83   else
  84     return DW_EH_PE_absptr;
  85 }
  86
  87 unsigned X8632_ELFTargetObjectFile::getFDEEncoding() const {
  88   if (TM.getRelocationModel() == Reloc::PIC_)
  89     return DW_EH_PE_pcrel | DW_EH_PE_sdata4;
  90   else
  91     return DW_EH_PE_absptr;
  92 }
  93
  94 unsigned X8632_ELFTargetObjectFile::getTTypeEncoding() const {
  95   if (TM.getRelocationModel() == Reloc::PIC_)
  96     return DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4;
  97   else
  98     return DW_EH_PE_absptr;
  99 }
 100
 101 unsigned X8664_ELFTargetObjectFile::getPersonalityEncoding() const {
 102   CodeModel::Model Model = TM.getCodeModel();
 103   if (TM.getRelocationModel() == Reloc::PIC_)
 104     return DW_EH_PE_indirect | DW_EH_PE_pcrel | (Model == CodeModel::Small ||
 105                                                  Model == CodeModel::Medium ?
 106                                             DW_EH_PE_sdata4 : DW_EH_PE_sdata8);
 107
 108   if (Model == CodeModel::Small || Model == CodeModel::Medium)
 109     return DW_EH_PE_udata4;
 110
 111   return DW_EH_PE_absptr;
 112 }
 113
 114 unsigned X8664_ELFTargetObjectFile::getLSDAEncoding() const {
 115   CodeModel::Model Model = TM.getCodeModel();
 116   if (TM.getRelocationModel() == Reloc::PIC_)
 117     return DW_EH_PE_pcrel | (Model == CodeModel::Small ?
 118                              DW_EH_PE_sdata4 : DW_EH_PE_sdata8);
 119
 120   if (Model == CodeModel::Small)
 121     return DW_EH_PE_udata4;
 122
 123   return DW_EH_PE_absptr;
 124 }
 125
 126 unsigned X8664_ELFTargetObjectFile::getFDEEncoding() const {
 127   CodeModel::Model Model = TM.getCodeModel();
 128   if (TM.getRelocationModel() == Reloc::PIC_)
 129     return DW_EH_PE_pcrel | (Model == CodeModel::Small ||
 130                              Model == CodeModel::Medium ?
 131                              DW_EH_PE_sdata4 : DW_EH_PE_sdata8);
 132
 133   if (Model == CodeModel::Small || Model == CodeModel::Medium)
 134     return DW_EH_PE_udata4;
 135
 136   return DW_EH_PE_absptr;
 137 }
 138
 139 unsigned X8664_ELFTargetObjectFile::getTTypeEncoding() const {
 140   CodeModel::Model Model = TM.getCodeModel();
 141   if (TM.getRelocationModel() == Reloc::PIC_)
 142     return DW_EH_PE_indirect | DW_EH_PE_pcrel | (Model == CodeModel::Small ||
 143                                                  Model == CodeModel::Medium ?
 144                                             DW_EH_PE_sdata4 : DW_EH_PE_sdata8);
 145
 146   if (Model == CodeModel::Small)
 147     return DW_EH_PE_udata4;
 148
 149   return DW_EH_PE_absptr;
 150 }
 151
 152 unsigned X8632_MachoTargetObjectFile::getPersonalityEncoding() const {
 153   return DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4;
 154 }
 155
 156 unsigned X8632_MachoTargetObjectFile::getLSDAEncoding() const {
 157   return DW_EH_PE_pcrel;
 158 }
 159
 160 unsigned X8632_MachoTargetObjectFile::getFDEEncoding() const {
 161   return DW_EH_PE_pcrel;
 162 }
 163
 164 unsigned X8632_MachoTargetObjectFile::getTTypeEncoding() const {
 165   return DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4;
 166 }
 167
 168 unsigned X8664_MachoTargetObjectFile::getPersonalityEncoding() const {
 169   return DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4;
 170 }
 171
 172 unsigned X8664_MachoTargetObjectFile::getLSDAEncoding() const {
 173   return DW_EH_PE_pcrel;
 174 }
 175
 176 unsigned X8664_MachoTargetObjectFile::getFDEEncoding() const {
 177   return DW_EH_PE_pcrel;
 178 }
 179
 180 unsigned X8664_MachoTargetObjectFile::getTTypeEncoding() const {
 181   return DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4;
 182 }