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 unsigned X8632_ELFTargetObjectFile::getPersonalityEncoding() const {
  42   if (TM.getRelocationModel() == Reloc::PIC_)
  43     return DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4;
  44   else
  45     return DW_EH_PE_absptr;
  46 }
  47
  48 unsigned X8632_ELFTargetObjectFile::getLSDAEncoding() const {
  49   if (TM.getRelocationModel() == Reloc::PIC_)
  50     return DW_EH_PE_pcrel | DW_EH_PE_sdata4;
  51   else
  52     return DW_EH_PE_absptr;
  53 }
  54
  55 unsigned X8632_ELFTargetObjectFile::getFDEEncoding() const {
  56   if (TM.getRelocationModel() == Reloc::PIC_)
  57     return DW_EH_PE_pcrel | DW_EH_PE_sdata4;
  58   else
  59     return DW_EH_PE_absptr;
  60 }
  61
  62 unsigned X8632_ELFTargetObjectFile::getTTypeEncoding() const {
  63   if (TM.getRelocationModel() == Reloc::PIC_)
  64     return DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4;
  65   else
  66     return DW_EH_PE_absptr;
  67 }
  68
  69 unsigned X8664_ELFTargetObjectFile::getPersonalityEncoding() const {
  70   CodeModel::Model Model = TM.getCodeModel();
  71   if (TM.getRelocationModel() == Reloc::PIC_)
  72     return DW_EH_PE_indirect | DW_EH_PE_pcrel | (Model == CodeModel::Small ||
  73                                                  Model == CodeModel::Medium ?
  74                                             DW_EH_PE_sdata4 : DW_EH_PE_sdata8);
  75
  76   if (Model == CodeModel::Small || Model == CodeModel::Medium)
  77     return DW_EH_PE_udata4;
  78
  79   return DW_EH_PE_absptr;
  80 }
  81
  82 unsigned X8664_ELFTargetObjectFile::getLSDAEncoding() const {
  83   CodeModel::Model Model = TM.getCodeModel();
  84   if (TM.getRelocationModel() == Reloc::PIC_)
  85     return DW_EH_PE_pcrel | (Model == CodeModel::Small ?
  86                              DW_EH_PE_sdata4 : DW_EH_PE_sdata8);
  87
  88   if (Model == CodeModel::Small)
  89     return DW_EH_PE_udata4;
  90
  91   return DW_EH_PE_absptr;
  92 }
  93
  94 unsigned X8664_ELFTargetObjectFile::getFDEEncoding() const {
  95   CodeModel::Model Model = TM.getCodeModel();
  96   if (TM.getRelocationModel() == Reloc::PIC_)
  97     return DW_EH_PE_pcrel | (Model == CodeModel::Small ||
  98                              Model == CodeModel::Medium ?
  99                              DW_EH_PE_sdata4 : DW_EH_PE_sdata8);
 100
 101   if (Model == CodeModel::Small || Model == CodeModel::Medium)
 102     return DW_EH_PE_udata4;
 103
 104   return DW_EH_PE_absptr;
 105 }
 106
 107 unsigned X8664_ELFTargetObjectFile::getTTypeEncoding() const {
 108   CodeModel::Model Model = TM.getCodeModel();
 109   if (TM.getRelocationModel() == Reloc::PIC_)
 110     return DW_EH_PE_indirect | DW_EH_PE_pcrel | (Model == CodeModel::Small ||
 111                                                  Model == CodeModel::Medium ?
 112                                             DW_EH_PE_sdata4 : DW_EH_PE_sdata8);
 113
 114   if (Model == CodeModel::Small)
 115     return DW_EH_PE_udata4;
 116
 117   return DW_EH_PE_absptr;
 118 }