lib/Target/ARM/ARMTargetObjectFile.cpp

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

#include "ARMTargetObjectFile.h"
#include "ARMSubtarget.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCSectionELF.h"
#include "llvm/Support/Dwarf.h"
#include "llvm/Support/ELF.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/ADT/StringExtras.h"
using namespace llvm;
using namespace dwarf;

//===----------------------------------------------------------------------===//
//                               ELF Target
//===----------------------------------------------------------------------===//

void ARMElfTargetObjectFile::Initialize(MCContext &Ctx,
                                        const TargetMachine &TM) {
  TargetLoweringObjectFileELF::Initialize(Ctx, TM);
  isAAPCS_ABI = TM.getSubtarget<ARMSubtarget>().isAAPCS_ABI();

  if (isAAPCS_ABI) {
    StaticCtorSection =
      getContext().getELFSection(".init_array", ELF::SHT_INIT_ARRAY,
                                 ELF::SHF_WRITE |
                                 ELF::SHF_ALLOC,
                                 SectionKind::getDataRel());
    StaticDtorSection =
      getContext().getELFSection(".fini_array", ELF::SHT_FINI_ARRAY,
                                 ELF::SHF_WRITE |
                                 ELF::SHF_ALLOC,
                                 SectionKind::getDataRel());
    LSDASection = NULL;
  }

  AttributesSection =
    getContext().getELFSection(".ARM.attributes",
                               ELF::SHT_ARM_ATTRIBUTES,
                               0,
                               SectionKind::getMetadata());
}

const MCSection *
ARMElfTargetObjectFile::getStaticCtorSection(unsigned Priority) const {
  if (!isAAPCS_ABI)
    return TargetLoweringObjectFileELF::getStaticCtorSection(Priority);

  if (Priority == 65535)
    return StaticCtorSection;

  // Emit ctors in priority order.
  std::string Name = std::string(".init_array.") + utostr(Priority);
  return getContext().getELFSection(Name, ELF::SHT_INIT_ARRAY,
                                    ELF::SHF_ALLOC | ELF::SHF_WRITE,
                                    SectionKind::getDataRel());
}

const MCSection *
ARMElfTargetObjectFile::getStaticDtorSection(unsigned Priority) const {
  if (!isAAPCS_ABI)
    return TargetLoweringObjectFileELF::getStaticDtorSection(Priority);

  if (Priority == 65535)
    return StaticDtorSection;

  // Emit dtors in priority order.
  std::string Name = std::string(".fini_array.") + utostr(Priority);
  return getContext().getELFSection(Name, ELF::SHT_FINI_ARRAY,
                                    ELF::SHF_ALLOC | ELF::SHF_WRITE,
                                    SectionKind::getDataRel());
}