lib/CodeGen/TargetLoweringObjectFileImpl.cpp

   1 //===-- llvm/CodeGen/TargetLoweringObjectFileImpl.cpp - Object File 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 // This file implements classes used to handle lowerings specific to common
  11 // object file formats.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
  16 #include "llvm/Constants.h"
  17 #include "llvm/DerivedTypes.h"
  18 #include "llvm/Function.h"
  19 #include "llvm/GlobalVariable.h"
  20 #include "llvm/CodeGen/MachineModuleInfoImpls.h"
  21 #include "llvm/MC/MCContext.h"
  22 #include "llvm/MC/MCExpr.h"
  23 #include "llvm/MC/MCSectionMachO.h"
  24 #include "llvm/MC/MCSectionELF.h"
  25 #include "llvm/MC/MCSectionCOFF.h"
  26 #include "llvm/MC/MCStreamer.h"
  27 #include "llvm/MC/MCSymbol.h"
  28 #include "llvm/Target/Mangler.h"
  29 #include "llvm/Target/TargetData.h"
  30 #include "llvm/Target/TargetMachine.h"
  31 #include "llvm/Target/TargetOptions.h"
  32 #include "llvm/Support/Dwarf.h"
  33 #include "llvm/Support/ELF.h"
  34 #include "llvm/Support/ErrorHandling.h"
  35 #include "llvm/Support/raw_ostream.h"
  36 #include "llvm/ADT/SmallString.h"
  37 #include "llvm/ADT/StringExtras.h"
  38 #include "llvm/ADT/Triple.h"
  39 using namespace llvm;
  40 using namespace dwarf;
  41
  42 //===----------------------------------------------------------------------===//
  43 //                                  ELF
  44 //===----------------------------------------------------------------------===//
  45
  46 void TargetLoweringObjectFileELF::Initialize(MCContext &Ctx,
  47                                              const TargetMachine &TM) {
  48   TargetLoweringObjectFile::Initialize(Ctx, TM);
  49
  50   BSSSection =
  51     getContext().getELFSection(".bss", ELF::SHT_NOBITS,
  52                                ELF::SHF_WRITE |ELF::SHF_ALLOC,
  53                                SectionKind::getBSS());
  54
  55   TextSection =
  56     getContext().getELFSection(".text", ELF::SHT_PROGBITS,
  57                                ELF::SHF_EXECINSTR |
  58                                ELF::SHF_ALLOC,
  59                                SectionKind::getText());
  60
  61   DataSection =
  62     getContext().getELFSection(".data", ELF::SHT_PROGBITS,
  63                                ELF::SHF_WRITE |ELF::SHF_ALLOC,
  64                                SectionKind::getDataRel());
  65
  66   ReadOnlySection =
  67     getContext().getELFSection(".rodata", ELF::SHT_PROGBITS,
  68                                ELF::SHF_ALLOC,
  69                                SectionKind::getReadOnly());
  70
  71   TLSDataSection =
  72     getContext().getELFSection(".tdata", ELF::SHT_PROGBITS,
  73                                ELF::SHF_ALLOC | ELF::SHF_TLS |
  74                                ELF::SHF_WRITE,
  75                                SectionKind::getThreadData());
  76
  77   TLSBSSSection =
  78     getContext().getELFSection(".tbss", ELF::SHT_NOBITS,
  79                                ELF::SHF_ALLOC | ELF::SHF_TLS |
  80                                ELF::SHF_WRITE,
  81                                SectionKind::getThreadBSS());
  82
  83   DataRelSection =
  84     getContext().getELFSection(".data.rel", ELF::SHT_PROGBITS,
  85                                ELF::SHF_ALLOC |ELF::SHF_WRITE,
  86                                SectionKind::getDataRel());
  87
  88   DataRelLocalSection =
  89     getContext().getELFSection(".data.rel.local", ELF::SHT_PROGBITS,
  90                                ELF::SHF_ALLOC |ELF::SHF_WRITE,
  91                                SectionKind::getDataRelLocal());
  92
  93   DataRelROSection =
  94     getContext().getELFSection(".data.rel.ro", ELF::SHT_PROGBITS,
  95                                ELF::SHF_ALLOC |ELF::SHF_WRITE,
  96                                SectionKind::getReadOnlyWithRel());
  97
  98   DataRelROLocalSection =
  99     getContext().getELFSection(".data.rel.ro.local", ELF::SHT_PROGBITS,
 100                                ELF::SHF_ALLOC |ELF::SHF_WRITE,
 101                                SectionKind::getReadOnlyWithRelLocal());
 102
 103   MergeableConst4Section =
 104     getContext().getELFSection(".rodata.cst4", ELF::SHT_PROGBITS,
 105                                ELF::SHF_ALLOC |ELF::SHF_MERGE,
 106                                SectionKind::getMergeableConst4());
 107
 108   MergeableConst8Section =
 109     getContext().getELFSection(".rodata.cst8", ELF::SHT_PROGBITS,
 110                                ELF::SHF_ALLOC |ELF::SHF_MERGE,
 111                                SectionKind::getMergeableConst8());
 112
 113   MergeableConst16Section =
 114     getContext().getELFSection(".rodata.cst16", ELF::SHT_PROGBITS,
 115                                ELF::SHF_ALLOC |ELF::SHF_MERGE,
 116                                SectionKind::getMergeableConst16());
 117
 118   StaticCtorSection =
 119     getContext().getELFSection(".ctors", ELF::SHT_PROGBITS,
 120                                ELF::SHF_ALLOC |ELF::SHF_WRITE,
 121                                SectionKind::getDataRel());
 122
 123   StaticDtorSection =
 124     getContext().getELFSection(".dtors", ELF::SHT_PROGBITS,
 125                                ELF::SHF_ALLOC |ELF::SHF_WRITE,
 126                                SectionKind::getDataRel());
 127
 128   // Exception Handling Sections.
 129
 130   // FIXME: We're emitting LSDA info into a readonly section on ELF, even though
 131   // it contains relocatable pointers.  In PIC mode, this is probably a big
 132   // runtime hit for C++ apps.  Either the contents of the LSDA need to be
 133   // adjusted or this should be a data section.
 134   LSDASection =
 135     getContext().getELFSection(".gcc_except_table", ELF::SHT_PROGBITS,
 136                                ELF::SHF_ALLOC,
 137                                SectionKind::getReadOnly());
 138   // Debug Info Sections.
 139   DwarfAbbrevSection =
 140     getContext().getELFSection(".debug_abbrev", ELF::SHT_PROGBITS, 0,
 141                                SectionKind::getMetadata());
 142   DwarfInfoSection =
 143     getContext().getELFSection(".debug_info", ELF::SHT_PROGBITS, 0,
 144                                SectionKind::getMetadata());
 145   DwarfLineSection =
 146     getContext().getELFSection(".debug_line", ELF::SHT_PROGBITS, 0,
 147                                SectionKind::getMetadata());
 148   DwarfFrameSection =
 149     getContext().getELFSection(".debug_frame", ELF::SHT_PROGBITS, 0,
 150                                SectionKind::getMetadata());
 151   DwarfPubNamesSection =
 152     getContext().getELFSection(".debug_pubnames", ELF::SHT_PROGBITS, 0,
 153                                SectionKind::getMetadata());
 154   DwarfPubTypesSection =
 155     getContext().getELFSection(".debug_pubtypes", ELF::SHT_PROGBITS, 0,
 156                                SectionKind::getMetadata());
 157   DwarfStrSection =
 158     getContext().getELFSection(".debug_str", ELF::SHT_PROGBITS, 0,
 159                                SectionKind::getMetadata());
 160   DwarfLocSection =
 161     getContext().getELFSection(".debug_loc", ELF::SHT_PROGBITS, 0,
 162                                SectionKind::getMetadata());
 163   DwarfARangesSection =
 164     getContext().getELFSection(".debug_aranges", ELF::SHT_PROGBITS, 0,
 165                                SectionKind::getMetadata());
 166   DwarfRangesSection =
 167     getContext().getELFSection(".debug_ranges", ELF::SHT_PROGBITS, 0,
 168                                SectionKind::getMetadata());
 169   DwarfMacroInfoSection =
 170     getContext().getELFSection(".debug_macinfo", ELF::SHT_PROGBITS, 0,
 171                                SectionKind::getMetadata());
 172 }
 173
 174 const MCSection *TargetLoweringObjectFileELF::getEHFrameSection() const {
 175   return getContext().getELFSection(".eh_frame", ELF::SHT_PROGBITS,
 176                                     ELF::SHF_ALLOC,
 177                                     SectionKind::getDataRel());
 178 }
 179
 180 MCSymbol *
 181 TargetLoweringObjectFileELF::getPersonalityPICSymbol(StringRef Name) const {
 182   Twine FullName = StringRef("DW.ref.") + Name;
 183   return getContext().GetOrCreateSymbol(FullName);
 184 }
 185
 186 void TargetLoweringObjectFileELF::emitPersonalityValue(MCStreamer &Streamer,
 187                                                        const TargetMachine &TM,
 188                                                    const MCSymbol *Sym) const {
 189     MCSymbol *Label = getPersonalityPICSymbol(Sym->getName());
 190     Streamer.EmitSymbolAttribute(Label, MCSA_Hidden);
 191     Streamer.EmitSymbolAttribute(Label, MCSA_Weak);
 192     Twine SectionName = StringRef(".data.") + Label->getName();
 193     SmallString<64> NameData;
 194     SectionName.toVector(NameData);
 195     unsigned Flags = ELF::SHF_ALLOC | ELF::SHF_WRITE | ELF::SHF_GROUP;
 196     const MCSection *Sec = getContext().getELFSection(NameData,
 197                                                       ELF::SHT_PROGBITS,
 198                                                       Flags,
 199                                                       SectionKind::getDataRel(),
 200                                                       0, Label->getName());
 201     Streamer.SwitchSection(Sec);
 202     Streamer.EmitValueToAlignment(8);
 203     Streamer.EmitSymbolAttribute(Label, MCSA_ELF_TypeObject);
 204     const MCExpr *E = MCConstantExpr::Create(8, getContext());
 205     Streamer.EmitELFSize(Label, E);
 206     Streamer.EmitLabel(Label);
 207
 208     unsigned Size = TM.getTargetData()->getPointerSize();
 209     Streamer.EmitSymbolValue(Sym, Size);
 210 }
 211
 212 static SectionKind
 213 getELFKindForNamedSection(StringRef Name, SectionKind K) {
 214   // FIXME: Why is this here? Codegen is should not be in the business
 215   // of figuring section flags. If the user wrote section(".eh_frame"),
 216   // we should just pass that to MC which will defer to the assembly
 217   // or use its default if producing an object file.
 218   if (Name.empty() || Name[0] != '.') return K;
 219
 220   // Some lame default implementation based on some magic section names.
 221   if (Name == ".bss" ||
 222       Name.startswith(".bss.") ||
 223       Name.startswith(".gnu.linkonce.b.") ||
 224       Name.startswith(".llvm.linkonce.b.") ||
 225       Name == ".sbss" ||
 226       Name.startswith(".sbss.") ||
 227       Name.startswith(".gnu.linkonce.sb.") ||
 228       Name.startswith(".llvm.linkonce.sb."))
 229     return SectionKind::getBSS();
 230
 231   if (Name == ".tdata" ||
 232       Name.startswith(".tdata.") ||
 233       Name.startswith(".gnu.linkonce.td.") ||
 234       Name.startswith(".llvm.linkonce.td."))
 235     return SectionKind::getThreadData();
 236
 237   if (Name == ".tbss" ||
 238       Name.startswith(".tbss.") ||
 239       Name.startswith(".gnu.linkonce.tb.") ||
 240       Name.startswith(".llvm.linkonce.tb."))
 241     return SectionKind::getThreadBSS();
 242
 243   if (Name == ".eh_frame")
 244     return SectionKind::getDataRel();
 245
 246   return K;
 247 }
 248
 249
 250 static unsigned getELFSectionType(StringRef Name, SectionKind K) {
 251
 252   if (Name == ".init_array")
 253     return ELF::SHT_INIT_ARRAY;
 254
 255   if (Name == ".fini_array")
 256     return ELF::SHT_FINI_ARRAY;
 257
 258   if (Name == ".preinit_array")
 259     return ELF::SHT_PREINIT_ARRAY;
 260
 261   if (K.isBSS() || K.isThreadBSS())
 262     return ELF::SHT_NOBITS;
 263
 264   return ELF::SHT_PROGBITS;
 265 }
 266
 267
 268 static unsigned
 269 getELFSectionFlags(SectionKind K) {
 270   unsigned Flags = 0;
 271
 272   if (!K.isMetadata())
 273     Flags |= ELF::SHF_ALLOC;
 274
 275   if (K.isText())
 276     Flags |= ELF::SHF_EXECINSTR;
 277
 278   if (K.isWriteable())
 279     Flags |= ELF::SHF_WRITE;
 280
 281   if (K.isThreadLocal())
 282     Flags |= ELF::SHF_TLS;
 283
 284   // K.isMergeableConst() is left out to honour PR4650
 285   if (K.isMergeableCString() || K.isMergeableConst4() ||
 286       K.isMergeableConst8() || K.isMergeableConst16())
 287     Flags |= ELF::SHF_MERGE;
 288
 289   if (K.isMergeableCString())
 290     Flags |= ELF::SHF_STRINGS;
 291
 292   return Flags;
 293 }
 294
 295
 296 const MCSection *TargetLoweringObjectFileELF::
 297 getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
 298                          Mangler *Mang, const TargetMachine &TM) const {
 299   StringRef SectionName = GV->getSection();
 300
 301   // Infer section flags from the section name if we can.
 302   Kind = getELFKindForNamedSection(SectionName, Kind);
 303
 304   return getContext().getELFSection(SectionName,
 305                                     getELFSectionType(SectionName, Kind),
 306                                     getELFSectionFlags(Kind), Kind);
 307 }
 308
 309 /// getSectionPrefixForGlobal - Return the section prefix name used by options
 310 /// FunctionsSections and DataSections.
 311 static const char *getSectionPrefixForGlobal(SectionKind Kind) {
 312   if (Kind.isText())                 return ".text.";
 313   if (Kind.isReadOnly())             return ".rodata.";
 314
 315   if (Kind.isThreadData())           return ".tdata.";
 316   if (Kind.isThreadBSS())            return ".tbss.";
 317
 318   if (Kind.isDataNoRel())            return ".data.";
 319   if (Kind.isDataRelLocal())         return ".data.rel.local.";
 320   if (Kind.isDataRel())              return ".data.rel.";
 321   if (Kind.isReadOnlyWithRelLocal()) return ".data.rel.ro.local.";
 322
 323   assert(Kind.isReadOnlyWithRel() && "Unknown section kind");
 324   return ".data.rel.ro.";
 325 }
 326
 327
 328 const MCSection *TargetLoweringObjectFileELF::
 329 SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
 330                        Mangler *Mang, const TargetMachine &TM) const {
 331   // If we have -ffunction-section or -fdata-section then we should emit the
 332   // global value to a uniqued section specifically for it.
 333   bool EmitUniquedSection;
 334   if (Kind.isText())
 335     EmitUniquedSection = TM.getFunctionSections();
 336   else
 337     EmitUniquedSection = TM.getDataSections();
 338
 339   // If this global is linkonce/weak and the target handles this by emitting it
 340   // into a 'uniqued' section name, create and return the section now.
 341   if ((GV->isWeakForLinker() || EmitUniquedSection) &&
 342       !Kind.isCommon() && !Kind.isBSS()) {
 343     const char *Prefix;
 344     Prefix = getSectionPrefixForGlobal(Kind);
 345
 346     SmallString<128> Name(Prefix, Prefix+strlen(Prefix));
 347     MCSymbol *Sym = Mang->getSymbol(GV);
 348     Name.append(Sym->getName().begin(), Sym->getName().end());
 349     StringRef Group = "";
 350     unsigned Flags = getELFSectionFlags(Kind);
 351     if (GV->isWeakForLinker()) {
 352       Group = Sym->getName();
 353       Flags |= ELF::SHF_GROUP;
 354     }
 355
 356     return getContext().getELFSection(Name.str(),
 357                                       getELFSectionType(Name.str(), Kind),
 358                                       Flags, Kind, 0, Group);
 359   }
 360
 361   if (Kind.isText()) return TextSection;
 362
 363   if (Kind.isMergeable1ByteCString() ||
 364       Kind.isMergeable2ByteCString() ||
 365       Kind.isMergeable4ByteCString()) {
 366
 367     // We also need alignment here.
 368     // FIXME: this is getting the alignment of the character, not the
 369     // alignment of the global!
 370     unsigned Align =
 371       TM.getTargetData()->getPreferredAlignment(cast<GlobalVariable>(GV));
 372
 373     const char *SizeSpec = ".rodata.str1.";
 374     if (Kind.isMergeable2ByteCString())
 375       SizeSpec = ".rodata.str2.";
 376     else if (Kind.isMergeable4ByteCString())
 377       SizeSpec = ".rodata.str4.";
 378     else
 379       assert(Kind.isMergeable1ByteCString() && "unknown string width");
 380
 381
 382     std::string Name = SizeSpec + utostr(Align);
 383     return getContext().getELFSection(Name, ELF::SHT_PROGBITS,
 384                                       ELF::SHF_ALLOC |
 385                                       ELF::SHF_MERGE |
 386                                       ELF::SHF_STRINGS,
 387                                       Kind);
 388   }
 389
 390   if (Kind.isMergeableConst()) {
 391     if (Kind.isMergeableConst4() && MergeableConst4Section)
 392       return MergeableConst4Section;
 393     if (Kind.isMergeableConst8() && MergeableConst8Section)
 394       return MergeableConst8Section;
 395     if (Kind.isMergeableConst16() && MergeableConst16Section)
 396       return MergeableConst16Section;
 397     return ReadOnlySection;  // .const
 398   }
 399
 400   if (Kind.isReadOnly())             return ReadOnlySection;
 401
 402   if (Kind.isThreadData())           return TLSDataSection;
 403   if (Kind.isThreadBSS())            return TLSBSSSection;
 404
 405   // Note: we claim that common symbols are put in BSSSection, but they are
 406   // really emitted with the magic .comm directive, which creates a symbol table
 407   // entry but not a section.
 408   if (Kind.isBSS() || Kind.isCommon()) return BSSSection;
 409
 410   if (Kind.isDataNoRel())            return DataSection;
 411   if (Kind.isDataRelLocal())         return DataRelLocalSection;
 412   if (Kind.isDataRel())              return DataRelSection;
 413   if (Kind.isReadOnlyWithRelLocal()) return DataRelROLocalSection;
 414
 415   assert(Kind.isReadOnlyWithRel() && "Unknown section kind");
 416   return DataRelROSection;
 417 }
 418
 419 /// getSectionForConstant - Given a mergeable constant with the
 420 /// specified size and relocation information, return a section that it
 421 /// should be placed in.
 422 const MCSection *TargetLoweringObjectFileELF::
 423 getSectionForConstant(SectionKind Kind) const {
 424   if (Kind.isMergeableConst4() && MergeableConst4Section)
 425     return MergeableConst4Section;
 426   if (Kind.isMergeableConst8() && MergeableConst8Section)
 427     return MergeableConst8Section;
 428   if (Kind.isMergeableConst16() && MergeableConst16Section)
 429     return MergeableConst16Section;
 430   if (Kind.isReadOnly())
 431     return ReadOnlySection;
 432
 433   if (Kind.isReadOnlyWithRelLocal()) return DataRelROLocalSection;
 434   assert(Kind.isReadOnlyWithRel() && "Unknown section kind");
 435   return DataRelROSection;
 436 }
 437
 438 const MCExpr *TargetLoweringObjectFileELF::
 439 getExprForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
 440                                MachineModuleInfo *MMI,
 441                                unsigned Encoding, MCStreamer &Streamer) const {
 442
 443   if (Encoding & dwarf::DW_EH_PE_indirect) {
 444     MachineModuleInfoELF &ELFMMI = MMI->getObjFileInfo<MachineModuleInfoELF>();
 445
 446     SmallString<128> Name;
 447     Mang->getNameWithPrefix(Name, GV, true);
 448     Name += ".DW.stub";
 449
 450     // Add information about the stub reference to ELFMMI so that the stub
 451     // gets emitted by the asmprinter.
 452     MCSymbol *SSym = getContext().GetOrCreateSymbol(Name.str());
 453     MachineModuleInfoImpl::StubValueTy &StubSym = ELFMMI.getGVStubEntry(SSym);
 454     if (StubSym.getPointer() == 0) {
 455       MCSymbol *Sym = Mang->getSymbol(GV);
 456       StubSym = MachineModuleInfoImpl::StubValueTy(Sym, !GV->hasLocalLinkage());
 457     }
 458
 459     return TargetLoweringObjectFile::
 460       getExprForDwarfReference(SSym, Mang, MMI,
 461                                Encoding & ~dwarf::DW_EH_PE_indirect, Streamer);
 462   }
 463
 464   return TargetLoweringObjectFile::
 465     getExprForDwarfGlobalReference(GV, Mang, MMI, Encoding, Streamer);
 466 }
 467
 468 //===----------------------------------------------------------------------===//
 469 //                                 MachO
 470 //===----------------------------------------------------------------------===//
 471
 472 void TargetLoweringObjectFileMachO::Initialize(MCContext &Ctx,
 473                                                const TargetMachine &TM) {
 474   // _foo.eh symbols are currently always exported so that the linker knows
 475   // about them.  This is not necessary on 10.6 and later, but it
 476   // doesn't hurt anything.
 477   // FIXME: I need to get this from Triple.
 478   IsFunctionEHSymbolGlobal = true;
 479   IsFunctionEHFrameSymbolPrivate = false;
 480   SupportsWeakOmittedEHFrame = false;
 481
 482   // .comm doesn't support alignment before Leopard.
 483   Triple T(((LLVMTargetMachine&)TM).getTargetTriple());
 484   if (T.isMacOSX() && T.isMacOSXVersionLT(10, 5))
 485     CommDirectiveSupportsAlignment = false;
 486
 487   TargetLoweringObjectFile::Initialize(Ctx, TM);
 488
 489   TextSection // .text
 490     = getContext().getMachOSection("__TEXT", "__text",
 491                                    MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
 492                                    SectionKind::getText());
 493   DataSection // .data
 494     = getContext().getMachOSection("__DATA", "__data", 0,
 495                                    SectionKind::getDataRel());
 496
 497   TLSDataSection // .tdata
 498     = getContext().getMachOSection("__DATA", "__thread_data",
 499                                    MCSectionMachO::S_THREAD_LOCAL_REGULAR,
 500                                    SectionKind::getDataRel());
 501   TLSBSSSection // .tbss
 502     = getContext().getMachOSection("__DATA", "__thread_bss",
 503                                    MCSectionMachO::S_THREAD_LOCAL_ZEROFILL,
 504                                    SectionKind::getThreadBSS());
 505
 506   // TODO: Verify datarel below.
 507   TLSTLVSection // .tlv
 508     = getContext().getMachOSection("__DATA", "__thread_vars",
 509                                    MCSectionMachO::S_THREAD_LOCAL_VARIABLES,
 510                                    SectionKind::getDataRel());
 511
 512   TLSThreadInitSection
 513     = getContext().getMachOSection("__DATA", "__thread_init",
 514                           MCSectionMachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS,
 515                           SectionKind::getDataRel());
 516
 517   CStringSection // .cstring
 518     = getContext().getMachOSection("__TEXT", "__cstring",
 519                                    MCSectionMachO::S_CSTRING_LITERALS,
 520                                    SectionKind::getMergeable1ByteCString());
 521   UStringSection
 522     = getContext().getMachOSection("__TEXT","__ustring", 0,
 523                                    SectionKind::getMergeable2ByteCString());
 524   FourByteConstantSection // .literal4
 525     = getContext().getMachOSection("__TEXT", "__literal4",
 526                                    MCSectionMachO::S_4BYTE_LITERALS,
 527                                    SectionKind::getMergeableConst4());
 528   EightByteConstantSection // .literal8
 529     = getContext().getMachOSection("__TEXT", "__literal8",
 530                                    MCSectionMachO::S_8BYTE_LITERALS,
 531                                    SectionKind::getMergeableConst8());
 532
 533   // ld_classic doesn't support .literal16 in 32-bit mode, and ld64 falls back
 534   // to using it in -static mode.
 535   SixteenByteConstantSection = 0;
 536   if (TM.getRelocationModel() != Reloc::Static &&
 537       TM.getTargetData()->getPointerSize() == 32)
 538     SixteenByteConstantSection =   // .literal16
 539       getContext().getMachOSection("__TEXT", "__literal16",
 540                                    MCSectionMachO::S_16BYTE_LITERALS,
 541                                    SectionKind::getMergeableConst16());
 542
 543   ReadOnlySection  // .const
 544     = getContext().getMachOSection("__TEXT", "__const", 0,
 545                                    SectionKind::getReadOnly());
 546
 547   TextCoalSection
 548     = getContext().getMachOSection("__TEXT", "__textcoal_nt",
 549                                    MCSectionMachO::S_COALESCED |
 550                                    MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
 551                                    SectionKind::getText());
 552   ConstTextCoalSection
 553     = getContext().getMachOSection("__TEXT", "__const_coal",
 554                                    MCSectionMachO::S_COALESCED,
 555                                    SectionKind::getReadOnly());
 556   ConstDataSection  // .const_data
 557     = getContext().getMachOSection("__DATA", "__const", 0,
 558                                    SectionKind::getReadOnlyWithRel());
 559   DataCoalSection
 560     = getContext().getMachOSection("__DATA","__datacoal_nt",
 561                                    MCSectionMachO::S_COALESCED,
 562                                    SectionKind::getDataRel());
 563   DataCommonSection
 564     = getContext().getMachOSection("__DATA","__common",
 565                                    MCSectionMachO::S_ZEROFILL,
 566                                    SectionKind::getBSS());
 567   DataBSSSection
 568     = getContext().getMachOSection("__DATA","__bss", MCSectionMachO::S_ZEROFILL,
 569                                    SectionKind::getBSS());
 570
 571
 572   LazySymbolPointerSection
 573     = getContext().getMachOSection("__DATA", "__la_symbol_ptr",
 574                                    MCSectionMachO::S_LAZY_SYMBOL_POINTERS,
 575                                    SectionKind::getMetadata());
 576   NonLazySymbolPointerSection
 577     = getContext().getMachOSection("__DATA", "__nl_symbol_ptr",
 578                                    MCSectionMachO::S_NON_LAZY_SYMBOL_POINTERS,
 579                                    SectionKind::getMetadata());
 580
 581   if (TM.getRelocationModel() == Reloc::Static) {
 582     StaticCtorSection
 583       = getContext().getMachOSection("__TEXT", "__constructor", 0,
 584                                      SectionKind::getDataRel());
 585     StaticDtorSection
 586       = getContext().getMachOSection("__TEXT", "__destructor", 0,
 587                                      SectionKind::getDataRel());
 588   } else {
 589     StaticCtorSection
 590       = getContext().getMachOSection("__DATA", "__mod_init_func",
 591                                      MCSectionMachO::S_MOD_INIT_FUNC_POINTERS,
 592                                      SectionKind::getDataRel());
 593     StaticDtorSection
 594       = getContext().getMachOSection("__DATA", "__mod_term_func",
 595                                      MCSectionMachO::S_MOD_TERM_FUNC_POINTERS,
 596                                      SectionKind::getDataRel());
 597   }
 598
 599   // Exception Handling.
 600   LSDASection = getContext().getMachOSection("__TEXT", "__gcc_except_tab", 0,
 601                                              SectionKind::getReadOnlyWithRel());
 602   // Debug Information.
 603   DwarfAbbrevSection =
 604     getContext().getMachOSection("__DWARF", "__debug_abbrev",
 605                                  MCSectionMachO::S_ATTR_DEBUG,
 606                                  SectionKind::getMetadata());
 607   DwarfInfoSection =
 608     getContext().getMachOSection("__DWARF", "__debug_info",
 609                                  MCSectionMachO::S_ATTR_DEBUG,
 610                                  SectionKind::getMetadata());
 611   DwarfLineSection =
 612     getContext().getMachOSection("__DWARF", "__debug_line",
 613                                  MCSectionMachO::S_ATTR_DEBUG,
 614                                  SectionKind::getMetadata());
 615   DwarfFrameSection =
 616     getContext().getMachOSection("__DWARF", "__debug_frame",
 617                                  MCSectionMachO::S_ATTR_DEBUG,
 618                                  SectionKind::getMetadata());
 619   DwarfPubNamesSection =
 620     getContext().getMachOSection("__DWARF", "__debug_pubnames",
 621                                  MCSectionMachO::S_ATTR_DEBUG,
 622                                  SectionKind::getMetadata());
 623   DwarfPubTypesSection =
 624     getContext().getMachOSection("__DWARF", "__debug_pubtypes",
 625                                  MCSectionMachO::S_ATTR_DEBUG,
 626                                  SectionKind::getMetadata());
 627   DwarfStrSection =
 628     getContext().getMachOSection("__DWARF", "__debug_str",
 629                                  MCSectionMachO::S_ATTR_DEBUG,
 630                                  SectionKind::getMetadata());
 631   DwarfLocSection =
 632     getContext().getMachOSection("__DWARF", "__debug_loc",
 633                                  MCSectionMachO::S_ATTR_DEBUG,
 634                                  SectionKind::getMetadata());
 635   DwarfARangesSection =
 636     getContext().getMachOSection("__DWARF", "__debug_aranges",
 637                                  MCSectionMachO::S_ATTR_DEBUG,
 638                                  SectionKind::getMetadata());
 639   DwarfRangesSection =
 640     getContext().getMachOSection("__DWARF", "__debug_ranges",
 641                                  MCSectionMachO::S_ATTR_DEBUG,
 642                                  SectionKind::getMetadata());
 643   DwarfMacroInfoSection =
 644     getContext().getMachOSection("__DWARF", "__debug_macinfo",
 645                                  MCSectionMachO::S_ATTR_DEBUG,
 646                                  SectionKind::getMetadata());
 647   DwarfDebugInlineSection =
 648     getContext().getMachOSection("__DWARF", "__debug_inlined",
 649                                  MCSectionMachO::S_ATTR_DEBUG,
 650                                  SectionKind::getMetadata());
 651
 652   TLSExtraDataSection = TLSTLVSection;
 653 }
 654
 655 const MCSection *TargetLoweringObjectFileMachO::getEHFrameSection() const {
 656   return getContext().getMachOSection("__TEXT", "__eh_frame",
 657                                       MCSectionMachO::S_COALESCED |
 658                                       MCSectionMachO::S_ATTR_NO_TOC |
 659                                       MCSectionMachO::S_ATTR_STRIP_STATIC_SYMS |
 660                                       MCSectionMachO::S_ATTR_LIVE_SUPPORT,
 661                                       SectionKind::getReadOnly());
 662 }
 663
 664 const MCSection *TargetLoweringObjectFileMachO::
 665 getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
 666                          Mangler *Mang, const TargetMachine &TM) const {
 667   // Parse the section specifier and create it if valid.
 668   StringRef Segment, Section;
 669   unsigned TAA = 0, StubSize = 0;
 670   bool TAAParsed;
 671   std::string ErrorCode =
 672     MCSectionMachO::ParseSectionSpecifier(GV->getSection(), Segment, Section,
 673                                           TAA, TAAParsed, StubSize);
 674   if (!ErrorCode.empty()) {
 675     // If invalid, report the error with report_fatal_error.
 676     report_fatal_error("Global variable '" + GV->getNameStr() +
 677                       "' has an invalid section specifier '" + GV->getSection()+
 678                       "': " + ErrorCode + ".");
 679     // Fall back to dropping it into the data section.
 680     return DataSection;
 681   }
 682
 683   // Get the section.
 684   const MCSectionMachO *S =
 685     getContext().getMachOSection(Segment, Section, TAA, StubSize, Kind);
 686
 687   // If TAA wasn't set by ParseSectionSpecifier() above,
 688   // use the value returned by getMachOSection() as a default.
 689   if (!TAAParsed)
 690     TAA = S->getTypeAndAttributes();
 691
 692   // Okay, now that we got the section, verify that the TAA & StubSize agree.
 693   // If the user declared multiple globals with different section flags, we need
 694   // to reject it here.
 695   if (S->getTypeAndAttributes() != TAA || S->getStubSize() != StubSize) {
 696     // If invalid, report the error with report_fatal_error.
 697     report_fatal_error("Global variable '" + GV->getNameStr() +
 698                       "' section type or attributes does not match previous"
 699                       " section specifier");
 700   }
 701
 702   return S;
 703 }
 704
 705 const MCSection *TargetLoweringObjectFileMachO::
 706 SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
 707                        Mangler *Mang, const TargetMachine &TM) const {
 708
 709   // Handle thread local data.
 710   if (Kind.isThreadBSS()) return TLSBSSSection;
 711   if (Kind.isThreadData()) return TLSDataSection;
 712
 713   if (Kind.isText())
 714     return GV->isWeakForLinker() ? TextCoalSection : TextSection;
 715
 716   // If this is weak/linkonce, put this in a coalescable section, either in text
 717   // or data depending on if it is writable.
 718   if (GV->isWeakForLinker()) {
 719     if (Kind.isReadOnly())
 720       return ConstTextCoalSection;
 721     return DataCoalSection;
 722   }
 723
 724   // FIXME: Alignment check should be handled by section classifier.
 725   if (Kind.isMergeable1ByteCString() &&
 726       TM.getTargetData()->getPreferredAlignment(cast<GlobalVariable>(GV)) < 32)
 727     return CStringSection;
 728
 729   // Do not put 16-bit arrays in the UString section if they have an
 730   // externally visible label, this runs into issues with certain linker
 731   // versions.
 732   if (Kind.isMergeable2ByteCString() && !GV->hasExternalLinkage() &&
 733       TM.getTargetData()->getPreferredAlignment(cast<GlobalVariable>(GV)) < 32)
 734     return UStringSection;
 735
 736   if (Kind.isMergeableConst()) {
 737     if (Kind.isMergeableConst4())
 738       return FourByteConstantSection;
 739     if (Kind.isMergeableConst8())
 740       return EightByteConstantSection;
 741     if (Kind.isMergeableConst16() && SixteenByteConstantSection)
 742       return SixteenByteConstantSection;
 743   }
 744
 745   // Otherwise, if it is readonly, but not something we can specially optimize,
 746   // just drop it in .const.
 747   if (Kind.isReadOnly())
 748     return ReadOnlySection;
 749
 750   // If this is marked const, put it into a const section.  But if the dynamic
 751   // linker needs to write to it, put it in the data segment.
 752   if (Kind.isReadOnlyWithRel())
 753     return ConstDataSection;
 754
 755   // Put zero initialized globals with strong external linkage in the
 756   // DATA, __common section with the .zerofill directive.
 757   if (Kind.isBSSExtern())
 758     return DataCommonSection;
 759
 760   // Put zero initialized globals with local linkage in __DATA,__bss directive
 761   // with the .zerofill directive (aka .lcomm).
 762   if (Kind.isBSSLocal())
 763     return DataBSSSection;
 764
 765   // Otherwise, just drop the variable in the normal data section.
 766   return DataSection;
 767 }
 768
 769 const MCSection *
 770 TargetLoweringObjectFileMachO::getSectionForConstant(SectionKind Kind) const {
 771   // If this constant requires a relocation, we have to put it in the data
 772   // segment, not in the text segment.
 773   if (Kind.isDataRel() || Kind.isReadOnlyWithRel())
 774     return ConstDataSection;
 775
 776   if (Kind.isMergeableConst4())
 777     return FourByteConstantSection;
 778   if (Kind.isMergeableConst8())
 779     return EightByteConstantSection;
 780   if (Kind.isMergeableConst16() && SixteenByteConstantSection)
 781     return SixteenByteConstantSection;
 782   return ReadOnlySection;  // .const
 783 }
 784
 785 /// shouldEmitUsedDirectiveFor - This hook allows targets to selectively decide
 786 /// not to emit the UsedDirective for some symbols in llvm.used.
 787 // FIXME: REMOVE this (rdar://7071300)
 788 bool TargetLoweringObjectFileMachO::
 789 shouldEmitUsedDirectiveFor(const GlobalValue *GV, Mangler *Mang) const {
 790   /// On Darwin, internally linked data beginning with "L" or "l" does not have
 791   /// the directive emitted (this occurs in ObjC metadata).
 792   if (!GV) return false;
 793
 794   // Check whether the mangled name has the "Private" or "LinkerPrivate" prefix.
 795   if (GV->hasLocalLinkage() && !isa<Function>(GV)) {
 796     // FIXME: ObjC metadata is currently emitted as internal symbols that have
 797     // \1L and \0l prefixes on them.  Fix them to be Private/LinkerPrivate and
 798     // this horrible hack can go away.
 799     MCSymbol *Sym = Mang->getSymbol(GV);
 800     if (Sym->getName()[0] == 'L' || Sym->getName()[0] == 'l')
 801       return false;
 802   }
 803
 804   return true;
 805 }
 806
 807 const MCExpr *TargetLoweringObjectFileMachO::
 808 getExprForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
 809                                MachineModuleInfo *MMI, unsigned Encoding,
 810                                MCStreamer &Streamer) const {
 811   // The mach-o version of this method defaults to returning a stub reference.
 812
 813   if (Encoding & DW_EH_PE_indirect) {
 814     MachineModuleInfoMachO &MachOMMI =
 815       MMI->getObjFileInfo<MachineModuleInfoMachO>();
 816
 817     SmallString<128> Name;
 818     Mang->getNameWithPrefix(Name, GV, true);
 819     Name += "$non_lazy_ptr";
 820
 821     // Add information about the stub reference to MachOMMI so that the stub
 822     // gets emitted by the asmprinter.
 823     MCSymbol *SSym = getContext().GetOrCreateSymbol(Name.str());
 824     MachineModuleInfoImpl::StubValueTy &StubSym = MachOMMI.getGVStubEntry(SSym);
 825     if (StubSym.getPointer() == 0) {
 826       MCSymbol *Sym = Mang->getSymbol(GV);
 827       StubSym = MachineModuleInfoImpl::StubValueTy(Sym, !GV->hasLocalLinkage());
 828     }
 829
 830     return TargetLoweringObjectFile::
 831       getExprForDwarfReference(SSym, Mang, MMI,
 832                                Encoding & ~dwarf::DW_EH_PE_indirect, Streamer);
 833   }
 834
 835   return TargetLoweringObjectFile::
 836     getExprForDwarfGlobalReference(GV, Mang, MMI, Encoding, Streamer);
 837 }
 838
 839 unsigned TargetLoweringObjectFileMachO::getPersonalityEncoding() const {
 840   return DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4;
 841 }
 842
 843 unsigned TargetLoweringObjectFileMachO::getLSDAEncoding() const {
 844   return DW_EH_PE_pcrel;
 845 }
 846
 847 unsigned TargetLoweringObjectFileMachO::getFDEEncoding() const {
 848   return DW_EH_PE_pcrel;
 849 }
 850
 851 unsigned TargetLoweringObjectFileMachO::getTTypeEncoding() const {
 852   return DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4;
 853 }
 854
 855 //===----------------------------------------------------------------------===//
 856 //                                  COFF
 857 //===----------------------------------------------------------------------===//
 858
 859 void TargetLoweringObjectFileCOFF::Initialize(MCContext &Ctx,
 860                                               const TargetMachine &TM) {
 861   TargetLoweringObjectFile::Initialize(Ctx, TM);
 862   TextSection =
 863     getContext().getCOFFSection(".text",
 864                                 COFF::IMAGE_SCN_CNT_CODE |
 865                                 COFF::IMAGE_SCN_MEM_EXECUTE |
 866                                 COFF::IMAGE_SCN_MEM_READ,
 867                                 SectionKind::getText());
 868   DataSection =
 869     getContext().getCOFFSection(".data",
 870                                 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 871                                 COFF::IMAGE_SCN_MEM_READ |
 872                                 COFF::IMAGE_SCN_MEM_WRITE,
 873                                 SectionKind::getDataRel());
 874   ReadOnlySection =
 875     getContext().getCOFFSection(".rdata",
 876                                 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 877                                 COFF::IMAGE_SCN_MEM_READ,
 878                                 SectionKind::getReadOnly());
 879   StaticCtorSection =
 880     getContext().getCOFFSection(".ctors",
 881                                 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 882                                 COFF::IMAGE_SCN_MEM_READ |
 883                                 COFF::IMAGE_SCN_MEM_WRITE,
 884                                 SectionKind::getDataRel());
 885   StaticDtorSection =
 886     getContext().getCOFFSection(".dtors",
 887                                 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 888                                 COFF::IMAGE_SCN_MEM_READ |
 889                                 COFF::IMAGE_SCN_MEM_WRITE,
 890                                 SectionKind::getDataRel());
 891
 892   // FIXME: We're emitting LSDA info into a readonly section on COFF, even
 893   // though it contains relocatable pointers.  In PIC mode, this is probably a
 894   // big runtime hit for C++ apps.  Either the contents of the LSDA need to be
 895   // adjusted or this should be a data section.
 896   LSDASection =
 897     getContext().getCOFFSection(".gcc_except_table",
 898                                 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 899                                 COFF::IMAGE_SCN_MEM_READ,
 900                                 SectionKind::getReadOnly());
 901   // Debug info.
 902   DwarfAbbrevSection =
 903     getContext().getCOFFSection(".debug_abbrev",
 904                                 COFF::IMAGE_SCN_MEM_DISCARDABLE |
 905                                 COFF::IMAGE_SCN_MEM_READ,
 906                                 SectionKind::getMetadata());
 907   DwarfInfoSection =
 908     getContext().getCOFFSection(".debug_info",
 909                                 COFF::IMAGE_SCN_MEM_DISCARDABLE |
 910                                 COFF::IMAGE_SCN_MEM_READ,
 911                                 SectionKind::getMetadata());
 912   DwarfLineSection =
 913     getContext().getCOFFSection(".debug_line",
 914                                 COFF::IMAGE_SCN_MEM_DISCARDABLE |
 915                                 COFF::IMAGE_SCN_MEM_READ,
 916                                 SectionKind::getMetadata());
 917   DwarfFrameSection =
 918     getContext().getCOFFSection(".debug_frame",
 919                                 COFF::IMAGE_SCN_MEM_DISCARDABLE |
 920                                 COFF::IMAGE_SCN_MEM_READ,
 921                                 SectionKind::getMetadata());
 922   DwarfPubNamesSection =
 923     getContext().getCOFFSection(".debug_pubnames",
 924                                 COFF::IMAGE_SCN_MEM_DISCARDABLE |
 925                                 COFF::IMAGE_SCN_MEM_READ,
 926                                 SectionKind::getMetadata());
 927   DwarfPubTypesSection =
 928     getContext().getCOFFSection(".debug_pubtypes",
 929                                 COFF::IMAGE_SCN_MEM_DISCARDABLE |
 930                                 COFF::IMAGE_SCN_MEM_READ,
 931                                 SectionKind::getMetadata());
 932   DwarfStrSection =
 933     getContext().getCOFFSection(".debug_str",
 934                                 COFF::IMAGE_SCN_MEM_DISCARDABLE |
 935                                 COFF::IMAGE_SCN_MEM_READ,
 936                                 SectionKind::getMetadata());
 937   DwarfLocSection =
 938     getContext().getCOFFSection(".debug_loc",
 939                                 COFF::IMAGE_SCN_MEM_DISCARDABLE |
 940                                 COFF::IMAGE_SCN_MEM_READ,
 941                                 SectionKind::getMetadata());
 942   DwarfARangesSection =
 943     getContext().getCOFFSection(".debug_aranges",
 944                                 COFF::IMAGE_SCN_MEM_DISCARDABLE |
 945                                 COFF::IMAGE_SCN_MEM_READ,
 946                                 SectionKind::getMetadata());
 947   DwarfRangesSection =
 948     getContext().getCOFFSection(".debug_ranges",
 949                                 COFF::IMAGE_SCN_MEM_DISCARDABLE |
 950                                 COFF::IMAGE_SCN_MEM_READ,
 951                                 SectionKind::getMetadata());
 952   DwarfMacroInfoSection =
 953     getContext().getCOFFSection(".debug_macinfo",
 954                                 COFF::IMAGE_SCN_MEM_DISCARDABLE |
 955                                 COFF::IMAGE_SCN_MEM_READ,
 956                                 SectionKind::getMetadata());
 957
 958   DrectveSection =
 959     getContext().getCOFFSection(".drectve",
 960                                 COFF::IMAGE_SCN_LNK_INFO,
 961                                 SectionKind::getMetadata());
 962 }
 963
 964 const MCSection *TargetLoweringObjectFileCOFF::getEHFrameSection() const {
 965   return getContext().getCOFFSection(".eh_frame",
 966                                      COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 967                                      COFF::IMAGE_SCN_MEM_READ |
 968                                      COFF::IMAGE_SCN_MEM_WRITE,
 969                                      SectionKind::getDataRel());
 970 }
 971
 972
 973 static unsigned
 974 getCOFFSectionFlags(SectionKind K) {
 975   unsigned Flags = 0;
 976
 977   if (K.isMetadata())
 978     Flags |=
 979       COFF::IMAGE_SCN_MEM_DISCARDABLE;
 980   else if (K.isText())
 981     Flags |=
 982       COFF::IMAGE_SCN_MEM_EXECUTE |
 983       COFF::IMAGE_SCN_MEM_READ |
 984       COFF::IMAGE_SCN_CNT_CODE;
 985   else if (K.isBSS ())
 986     Flags |=
 987       COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA |
 988       COFF::IMAGE_SCN_MEM_READ |
 989       COFF::IMAGE_SCN_MEM_WRITE;
 990   else if (K.isReadOnly())
 991     Flags |=
 992       COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 993       COFF::IMAGE_SCN_MEM_READ;
 994   else if (K.isWriteable())
 995     Flags |=
 996       COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 997       COFF::IMAGE_SCN_MEM_READ |
 998       COFF::IMAGE_SCN_MEM_WRITE;
 999
1000   return Flags;
1001 }
1002
1003 const MCSection *TargetLoweringObjectFileCOFF::
1004 getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
1005                          Mangler *Mang, const TargetMachine &TM) const {
1006   return getContext().getCOFFSection(GV->getSection(),
1007                                      getCOFFSectionFlags(Kind),
1008                                      Kind);
1009 }
1010
1011 static const char *getCOFFSectionPrefixForUniqueGlobal(SectionKind Kind) {
1012   if (Kind.isText())
1013     return ".text$";
1014   if (Kind.isBSS ())
1015     return ".bss$";
1016   if (Kind.isWriteable())
1017     return ".data$";
1018   return ".rdata$";
1019 }
1020
1021
1022 const MCSection *TargetLoweringObjectFileCOFF::
1023 SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
1024                        Mangler *Mang, const TargetMachine &TM) const {
1025   assert(!Kind.isThreadLocal() && "Doesn't support TLS");
1026
1027   // If this global is linkonce/weak and the target handles this by emitting it
1028   // into a 'uniqued' section name, create and return the section now.
1029   if (GV->isWeakForLinker()) {
1030     const char *Prefix = getCOFFSectionPrefixForUniqueGlobal(Kind);
1031     SmallString<128> Name(Prefix, Prefix+strlen(Prefix));
1032     MCSymbol *Sym = Mang->getSymbol(GV);
1033     Name.append(Sym->getName().begin() + 1, Sym->getName().end());
1034
1035     unsigned Characteristics = getCOFFSectionFlags(Kind);
1036
1037     Characteristics |= COFF::IMAGE_SCN_LNK_COMDAT;
1038
1039     return getContext().getCOFFSection(Name.str(), Characteristics,
1040                           COFF::IMAGE_COMDAT_SELECT_ANY, Kind);
1041   }
1042
1043   if (Kind.isText())
1044     return getTextSection();
1045
1046   return getDataSection();
1047 }
1048