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) &&
  60       (Encoding & DW_EH_PE_pcrel)) {
  61     SmallString<128> Name;
  62     Mang->getNameWithPrefix(Name, GV, false);
  63   const MCSymbol *Sym = getContext().CreateSymbol(Name);
  64   const MCExpr *Res =
  65     X86MCTargetExpr::Create(Sym, X86MCTargetExpr::GOTPCREL, getContext());
  66   const MCExpr *Four = MCConstantExpr::Create(4, getContext());
  67   return MCBinaryExpr::CreateAdd(Res, Four, getContext());
  68   }
  69
  70   return TargetLoweringObjectFileMachO::
  71     getSymbolForDwarfGlobalReference(GV, Mang, MMI, Encoding);
  72 }
  73
  74 unsigned X8632_ELFTargetObjectFile::getPersonalityEncoding() const {
  75   if (TM.getRelocationModel() == Reloc::PIC_)
  76     return DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4;
  77   else
  78     return DW_EH_PE_absptr;
  79 }
  80
  81 unsigned X8632_ELFTargetObjectFile::getLSDAEncoding() const {
  82   if (TM.getRelocationModel() == Reloc::PIC_)
  83     return DW_EH_PE_pcrel | DW_EH_PE_sdata4;
  84   else
  85     return DW_EH_PE_absptr;
  86 }
  87
  88 unsigned X8632_ELFTargetObjectFile::getFDEEncoding() const {
  89   if (TM.getRelocationModel() == Reloc::PIC_)
  90     return DW_EH_PE_pcrel | DW_EH_PE_sdata4;
  91   else
  92     return DW_EH_PE_absptr;
  93 }
  94
  95 unsigned X8632_ELFTargetObjectFile::getTTypeEncoding() const {
  96   if (TM.getRelocationModel() == Reloc::PIC_)
  97     return DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4;
  98   else
  99     return DW_EH_PE_absptr;
 100 }
 101
 102 unsigned X8664_ELFTargetObjectFile::getPersonalityEncoding() const {
 103   CodeModel::Model Model = TM.getCodeModel();
 104   if (TM.getRelocationModel() == Reloc::PIC_)
 105     return DW_EH_PE_indirect | DW_EH_PE_pcrel | (Model == CodeModel::Small ||
 106                                                  Model == CodeModel::Medium ?
 107                                             DW_EH_PE_sdata4 : DW_EH_PE_sdata8);
 108
 109   if (Model == CodeModel::Small || Model == CodeModel::Medium)
 110     return DW_EH_PE_udata4;
 111
 112   return DW_EH_PE_absptr;
 113 }
 114
 115 unsigned X8664_ELFTargetObjectFile::getLSDAEncoding() const {
 116   CodeModel::Model Model = TM.getCodeModel();
 117   if (TM.getRelocationModel() == Reloc::PIC_)
 118     return DW_EH_PE_pcrel | (Model == CodeModel::Small ?
 119                              DW_EH_PE_sdata4 : DW_EH_PE_sdata8);
 120
 121   if (Model == CodeModel::Small)
 122     return DW_EH_PE_udata4;
 123
 124   return DW_EH_PE_absptr;
 125 }
 126
 127 unsigned X8664_ELFTargetObjectFile::getFDEEncoding() const {
 128   CodeModel::Model Model = TM.getCodeModel();
 129   if (TM.getRelocationModel() == Reloc::PIC_)
 130     return DW_EH_PE_pcrel | (Model == CodeModel::Small ||
 131                              Model == CodeModel::Medium ?
 132                              DW_EH_PE_sdata4 : DW_EH_PE_sdata8);
 133
 134   if (Model == CodeModel::Small || Model == CodeModel::Medium)
 135     return DW_EH_PE_udata4;
 136
 137   return DW_EH_PE_absptr;
 138 }
 139
 140 unsigned X8664_ELFTargetObjectFile::getTTypeEncoding() const {
 141   CodeModel::Model Model = TM.getCodeModel();
 142   if (TM.getRelocationModel() == Reloc::PIC_)
 143     return DW_EH_PE_indirect | DW_EH_PE_pcrel | (Model == CodeModel::Small ||
 144                                                  Model == CodeModel::Medium ?
 145                                             DW_EH_PE_sdata4 : DW_EH_PE_sdata8);
 146
 147   if (Model == CodeModel::Small)
 148     return DW_EH_PE_udata4;
 149
 150   return DW_EH_PE_absptr;
 151 }
 152
 153 unsigned X8632_MachoTargetObjectFile::getPersonalityEncoding() const {
 154   return DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4;
 155 }
 156
 157 unsigned X8632_MachoTargetObjectFile::getLSDAEncoding() const {
 158   return DW_EH_PE_pcrel | DW_EH_PE_sdata4;
 159 }
 160
 161 unsigned X8632_MachoTargetObjectFile::getFDEEncoding() const {
 162   return DW_EH_PE_pcrel | DW_EH_PE_sdata4;
 163 }
 164
 165 unsigned X8632_MachoTargetObjectFile::getTTypeEncoding() const {
 166   return DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4;
 167 }
 168
 169 unsigned X8664_MachoTargetObjectFile::getPersonalityEncoding() const {
 170   return DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4;
 171 }
 172
 173 unsigned X8664_MachoTargetObjectFile::getLSDAEncoding() const {
 174   return DW_EH_PE_pcrel | DW_EH_PE_sdata4;
 175 }
 176
 177 unsigned X8664_MachoTargetObjectFile::getFDEEncoding() const {
 178   return DW_EH_PE_pcrel | DW_EH_PE_sdata4;
 179 }
 180
 181 unsigned X8664_MachoTargetObjectFile::getTTypeEncoding() const {
 182   return DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4;
 183 }