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