lib/Target/X86/X86TargetObjectFile.cpp

//===-- llvm/Target/X86/X86TargetObjectFile.cpp - X86 Object Info ---------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#include "X86MCTargetExpr.h"
#include "X86TargetObjectFile.h"
#include "X86TargetMachine.h"
#include "llvm/CodeGen/MachineModuleInfoImpls.h"
#include "llvm/MC/MCContext.h"
#include "llvm/Target/Mangler.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Support/Dwarf.h"
using namespace llvm;
using namespace dwarf;

const MCExpr *X8632_MachoTargetObjectFile::
getSymbolForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
                             MachineModuleInfo *MMI, unsigned Encoding) const {
  // The mach-o version of this method defaults to returning a stub reference.

  if (Encoding & DW_EH_PE_indirect) {
    MachineModuleInfoMachO &MachOMMI =
      MMI->getObjFileInfo<MachineModuleInfoMachO>();

    SmallString<128> Name;
    Mang->getNameWithPrefix(Name, GV, true);
    Name += "$non_lazy_ptr";

    // Add information about the stub reference to MachOMMI so that the stub
    // gets emitted by the asmprinter.
    MCSymbol *Sym = getContext().GetOrCreateSymbol(Name.str());
    MCSymbol *&StubSym = MachOMMI.getGVStubEntry(Sym);
    if (StubSym == 0) {
      Name.clear();
      Mang->getNameWithPrefix(Name, GV, false);
      StubSym = getContext().GetOrCreateSymbol(Name.str());
    }

    return TargetLoweringObjectFile::
      getSymbolForDwarfReference(Sym, MMI,
                                 Encoding & ~dwarf::DW_EH_PE_indirect);
  }

  return TargetLoweringObjectFileMachO::
    getSymbolForDwarfGlobalReference(GV, Mang, MMI, Encoding);
}

const MCExpr *X8664_MachoTargetObjectFile::
getSymbolForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
                           MachineModuleInfo *MMI, unsigned Encoding) const {

  // On Darwin/X86-64, we can reference dwarf symbols with foo@GOTPCREL+4, which
  // is an indirect pc-relative reference.
  if ((Encoding & DW_EH_PE_indirect) &&
      (Encoding & DW_EH_PE_pcrel)) {
    SmallString<128> Name;
    Mang->getNameWithPrefix(Name, GV, false);
  const MCSymbol *Sym = getContext().CreateSymbol(Name);
  const MCExpr *Res =
    X86MCTargetExpr::Create(Sym, X86MCTargetExpr::GOTPCREL, getContext());
  const MCExpr *Four = MCConstantExpr::Create(4, getContext());
  return MCBinaryExpr::CreateAdd(Res, Four, getContext());
  }

  return TargetLoweringObjectFileMachO::
    getSymbolForDwarfGlobalReference(GV, Mang, MMI, Encoding);
}

unsigned X8632_ELFTargetObjectFile::getPersonalityEncoding() const {
  if (TM.getRelocationModel() == Reloc::PIC_)
    return DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4;
  else
    return DW_EH_PE_absptr;
}

unsigned X8632_ELFTargetObjectFile::getLSDAEncoding() const {
  if (TM.getRelocationModel() == Reloc::PIC_)
    return DW_EH_PE_pcrel | DW_EH_PE_sdata4;
  else
    return DW_EH_PE_absptr;
}

unsigned X8632_ELFTargetObjectFile::getFDEEncoding() const {
  if (TM.getRelocationModel() == Reloc::PIC_)
    return DW_EH_PE_pcrel | DW_EH_PE_sdata4;
  else
    return DW_EH_PE_absptr;
}

unsigned X8632_ELFTargetObjectFile::getTTypeEncoding() const {
  if (TM.getRelocationModel() == Reloc::PIC_)
    return DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4;
  else
    return DW_EH_PE_absptr;
}

unsigned X8664_ELFTargetObjectFile::getPersonalityEncoding() const {
  CodeModel::Model Model = TM.getCodeModel();
  if (TM.getRelocationModel() == Reloc::PIC_)
    return DW_EH_PE_indirect | DW_EH_PE_pcrel | (Model == CodeModel::Small ||
                                                 Model == CodeModel::Medium ?
                                            DW_EH_PE_sdata4 : DW_EH_PE_sdata8);

  if (Model == CodeModel::Small || Model == CodeModel::Medium)
    return DW_EH_PE_udata4;

  return DW_EH_PE_absptr;
}

unsigned X8664_ELFTargetObjectFile::getLSDAEncoding() const {
  CodeModel::Model Model = TM.getCodeModel();
  if (TM.getRelocationModel() == Reloc::PIC_)
    return DW_EH_PE_pcrel | (Model == CodeModel::Small ?
                             DW_EH_PE_sdata4 : DW_EH_PE_sdata8);

  if (Model == CodeModel::Small)
    return DW_EH_PE_udata4;

  return DW_EH_PE_absptr;
}

unsigned X8664_ELFTargetObjectFile::getFDEEncoding() const {
  CodeModel::Model Model = TM.getCodeModel();
  if (TM.getRelocationModel() == Reloc::PIC_)
    return DW_EH_PE_pcrel | (Model == CodeModel::Small ||
                             Model == CodeModel::Medium ?
                             DW_EH_PE_sdata4 : DW_EH_PE_sdata8);

  if (Model == CodeModel::Small || Model == CodeModel::Medium)
    return DW_EH_PE_udata4;

  return DW_EH_PE_absptr;
}

unsigned X8664_ELFTargetObjectFile::getTTypeEncoding() const {
  CodeModel::Model Model = TM.getCodeModel();
  if (TM.getRelocationModel() == Reloc::PIC_)
    return DW_EH_PE_indirect | DW_EH_PE_pcrel | (Model == CodeModel::Small ||
                                                 Model == CodeModel::Medium ?
                                            DW_EH_PE_sdata4 : DW_EH_PE_sdata8);

  if (Model == CodeModel::Small)
    return DW_EH_PE_udata4;

  return DW_EH_PE_absptr;
}

unsigned X8632_MachoTargetObjectFile::getPersonalityEncoding() const {
  return DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4;
}

unsigned X8632_MachoTargetObjectFile::getLSDAEncoding() const {
  return DW_EH_PE_pcrel | DW_EH_PE_sdata4;
}

unsigned X8632_MachoTargetObjectFile::getFDEEncoding() const {
  return DW_EH_PE_pcrel | DW_EH_PE_sdata4;
}

unsigned X8632_MachoTargetObjectFile::getTTypeEncoding() const {
  return DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4;
}

unsigned X8664_MachoTargetObjectFile::getPersonalityEncoding() const {
  return DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4;
}

unsigned X8664_MachoTargetObjectFile::getLSDAEncoding() const {
  return DW_EH_PE_pcrel | DW_EH_PE_sdata4;
}

unsigned X8664_MachoTargetObjectFile::getFDEEncoding() const {
  return DW_EH_PE_pcrel | DW_EH_PE_sdata4;
}

unsigned X8664_MachoTargetObjectFile::getTTypeEncoding() const {
  return DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4;
}