contrib/llvm/lib/Target/ARM/ARMTargetObjectFile.cpp

   1 //===-- llvm/Target/ARMTargetObjectFile.cpp - ARM Object Info Impl --------===//
   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 "ARMTargetObjectFile.h"
  11 #include "ARMSubtarget.h"
  12 #include "llvm/MC/MCContext.h"
  13 #include "llvm/MC/MCSectionELF.h"
  14 #include "llvm/Support/Dwarf.h"
  15 #include "llvm/Support/ELF.h"
  16 #include "llvm/Target/TargetMachine.h"
  17 #include "llvm/ADT/StringExtras.h"
  18 using namespace llvm;
  19 using namespace dwarf;
  20
  21 //===----------------------------------------------------------------------===//
  22 //                               ELF Target
  23 //===----------------------------------------------------------------------===//
  24
  25 void ARMElfTargetObjectFile::Initialize(MCContext &Ctx,
  26                                         const TargetMachine &TM) {
  27   TargetLoweringObjectFileELF::Initialize(Ctx, TM);
  28   isAAPCS_ABI = TM.getSubtarget<ARMSubtarget>().isAAPCS_ABI();
  29
  30   if (isAAPCS_ABI) {
  31     StaticCtorSection =
  32       getContext().getELFSection(".init_array", ELF::SHT_INIT_ARRAY,
  33                                  ELF::SHF_WRITE |
  34                                  ELF::SHF_ALLOC,
  35                                  SectionKind::getDataRel());
  36     StaticDtorSection =
  37       getContext().getELFSection(".fini_array", ELF::SHT_FINI_ARRAY,
  38                                  ELF::SHF_WRITE |
  39                                  ELF::SHF_ALLOC,
  40                                  SectionKind::getDataRel());
  41     LSDASection = NULL;
  42   }
  43
  44   AttributesSection =
  45     getContext().getELFSection(".ARM.attributes",
  46                                ELF::SHT_ARM_ATTRIBUTES,
  47                                0,
  48                                SectionKind::getMetadata());
  49 }
  50
  51 const MCSection *
  52 ARMElfTargetObjectFile::getStaticCtorSection(unsigned Priority) const {
  53   if (!isAAPCS_ABI)
  54     return TargetLoweringObjectFileELF::getStaticCtorSection(Priority);
  55
  56   if (Priority == 65535)
  57     return StaticCtorSection;
  58
  59   // Emit ctors in priority order.
  60   std::string Name = std::string(".init_array.") + utostr(Priority);
  61   return getContext().getELFSection(Name, ELF::SHT_INIT_ARRAY,
  62                                     ELF::SHF_ALLOC | ELF::SHF_WRITE,
  63                                     SectionKind::getDataRel());
  64 }
  65
  66 const MCSection *
  67 ARMElfTargetObjectFile::getStaticDtorSection(unsigned Priority) const {
  68   if (!isAAPCS_ABI)
  69     return TargetLoweringObjectFileELF::getStaticDtorSection(Priority);
  70
  71   if (Priority == 65535)
  72     return StaticDtorSection;
  73
  74   // Emit dtors in priority order.
  75   std::string Name = std::string(".fini_array.") + utostr(Priority);
  76   return getContext().getELFSection(Name, ELF::SHT_FINI_ARRAY,
  77                                     ELF::SHF_ALLOC | ELF::SHF_WRITE,
  78                                     SectionKind::getDataRel());
  79 }