contrib/llvm/lib/MC/MCObjectFileInfo.cpp

   1 //===-- MCObjectFileInfo.cpp - Object File Information --------------------===//
   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 "llvm/MC/MCObjectFileInfo.h"
  11 #include "llvm/ADT/StringExtras.h"
  12 #include "llvm/ADT/Triple.h"
  13 #include "llvm/MC/MCAsmInfo.h"
  14 #include "llvm/MC/MCContext.h"
  15 #include "llvm/MC/MCSection.h"
  16 #include "llvm/MC/MCSectionCOFF.h"
  17 #include "llvm/MC/MCSectionELF.h"
  18 #include "llvm/MC/MCSectionMachO.h"
  19 #include "llvm/Support/COFF.h"
  20
  21 using namespace llvm;
  22
  23 static bool useCompactUnwind(const Triple &T) {
  24   // Only on darwin.
  25   if (!T.isOSDarwin())
  26     return false;
  27
  28   // aarch64 always has it.
  29   if (T.getArch() == Triple::aarch64)
  30     return true;
  31
  32   // armv7k always has it.
  33   if (T.isWatchABI())
  34     return true;
  35
  36   // Use it on newer version of OS X.
  37   if (T.isMacOSX() && !T.isMacOSXVersionLT(10, 6))
  38     return true;
  39
  40   // And the iOS simulator.
  41   if (T.isiOS() &&
  42       (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86))
  43     return true;
  44
  45   return false;
  46 }
  47
  48 void MCObjectFileInfo::initMachOMCObjectFileInfo(const Triple &T) {
  49   // MachO
  50   SupportsWeakOmittedEHFrame = false;
  51
  52   EHFrameSection = Ctx->getMachOSection(
  53       "__TEXT", "__eh_frame",
  54       MachO::S_COALESCED | MachO::S_ATTR_NO_TOC |
  55           MachO::S_ATTR_STRIP_STATIC_SYMS | MachO::S_ATTR_LIVE_SUPPORT,
  56       SectionKind::getReadOnly());
  57
  58   if (T.isOSDarwin() && T.getArch() == Triple::aarch64)
  59     SupportsCompactUnwindWithoutEHFrame = true;
  60
  61   if (T.isWatchABI())
  62     OmitDwarfIfHaveCompactUnwind = true;
  63
  64   PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel
  65     | dwarf::DW_EH_PE_sdata4;
  66   LSDAEncoding = FDECFIEncoding = dwarf::DW_EH_PE_pcrel;
  67   TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
  68     dwarf::DW_EH_PE_sdata4;
  69
  70   // .comm doesn't support alignment before Leopard.
  71   if (T.isMacOSX() && T.isMacOSXVersionLT(10, 5))
  72     CommDirectiveSupportsAlignment = false;
  73
  74   TextSection // .text
  75     = Ctx->getMachOSection("__TEXT", "__text",
  76                            MachO::S_ATTR_PURE_INSTRUCTIONS,
  77                            SectionKind::getText());
  78   DataSection // .data
  79       = Ctx->getMachOSection("__DATA", "__data", 0, SectionKind::getData());
  80
  81   // BSSSection might not be expected initialized on msvc.
  82   BSSSection = nullptr;
  83
  84   TLSDataSection // .tdata
  85       = Ctx->getMachOSection("__DATA", "__thread_data",
  86                              MachO::S_THREAD_LOCAL_REGULAR,
  87                              SectionKind::getData());
  88   TLSBSSSection // .tbss
  89     = Ctx->getMachOSection("__DATA", "__thread_bss",
  90                            MachO::S_THREAD_LOCAL_ZEROFILL,
  91                            SectionKind::getThreadBSS());
  92
  93   // TODO: Verify datarel below.
  94   TLSTLVSection // .tlv
  95       = Ctx->getMachOSection("__DATA", "__thread_vars",
  96                              MachO::S_THREAD_LOCAL_VARIABLES,
  97                              SectionKind::getData());
  98
  99   TLSThreadInitSection = Ctx->getMachOSection(
 100       "__DATA", "__thread_init", MachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS,
 101       SectionKind::getData());
 102
 103   CStringSection // .cstring
 104     = Ctx->getMachOSection("__TEXT", "__cstring",
 105                            MachO::S_CSTRING_LITERALS,
 106                            SectionKind::getMergeable1ByteCString());
 107   UStringSection
 108     = Ctx->getMachOSection("__TEXT","__ustring", 0,
 109                            SectionKind::getMergeable2ByteCString());
 110   FourByteConstantSection // .literal4
 111     = Ctx->getMachOSection("__TEXT", "__literal4",
 112                            MachO::S_4BYTE_LITERALS,
 113                            SectionKind::getMergeableConst4());
 114   EightByteConstantSection // .literal8
 115     = Ctx->getMachOSection("__TEXT", "__literal8",
 116                            MachO::S_8BYTE_LITERALS,
 117                            SectionKind::getMergeableConst8());
 118
 119   SixteenByteConstantSection // .literal16
 120       = Ctx->getMachOSection("__TEXT", "__literal16",
 121                              MachO::S_16BYTE_LITERALS,
 122                              SectionKind::getMergeableConst16());
 123
 124   ReadOnlySection  // .const
 125     = Ctx->getMachOSection("__TEXT", "__const", 0,
 126                            SectionKind::getReadOnly());
 127
 128   // If the target is not powerpc, map the coal sections to the non-coal
 129   // sections.
 130   //
 131   // "__TEXT/__textcoal_nt" => section "__TEXT/__text"
 132   // "__TEXT/__const_coal"  => section "__TEXT/__const"
 133   // "__DATA/__datacoal_nt" => section "__DATA/__data"
 134   Triple::ArchType ArchTy = T.getArch();
 135
 136   if (ArchTy == Triple::ppc || ArchTy == Triple::ppc64) {
 137     TextCoalSection
 138       = Ctx->getMachOSection("__TEXT", "__textcoal_nt",
 139                              MachO::S_COALESCED |
 140                              MachO::S_ATTR_PURE_INSTRUCTIONS,
 141                              SectionKind::getText());
 142     ConstTextCoalSection
 143       = Ctx->getMachOSection("__TEXT", "__const_coal",
 144                              MachO::S_COALESCED,
 145                              SectionKind::getReadOnly());
 146     DataCoalSection = Ctx->getMachOSection(
 147         "__DATA", "__datacoal_nt", MachO::S_COALESCED, SectionKind::getData());
 148   } else {
 149     TextCoalSection = TextSection;
 150     ConstTextCoalSection = ReadOnlySection;
 151     DataCoalSection = DataSection;
 152   }
 153
 154   ConstDataSection  // .const_data
 155     = Ctx->getMachOSection("__DATA", "__const", 0,
 156                            SectionKind::getReadOnlyWithRel());
 157   DataCommonSection
 158     = Ctx->getMachOSection("__DATA","__common",
 159                            MachO::S_ZEROFILL,
 160                            SectionKind::getBSS());
 161   DataBSSSection
 162     = Ctx->getMachOSection("__DATA","__bss", MachO::S_ZEROFILL,
 163                            SectionKind::getBSS());
 164
 165
 166   LazySymbolPointerSection
 167     = Ctx->getMachOSection("__DATA", "__la_symbol_ptr",
 168                            MachO::S_LAZY_SYMBOL_POINTERS,
 169                            SectionKind::getMetadata());
 170   NonLazySymbolPointerSection
 171     = Ctx->getMachOSection("__DATA", "__nl_symbol_ptr",
 172                            MachO::S_NON_LAZY_SYMBOL_POINTERS,
 173                            SectionKind::getMetadata());
 174
 175   ThreadLocalPointerSection
 176     = Ctx->getMachOSection("__DATA", "__thread_ptr",
 177                            MachO::S_THREAD_LOCAL_VARIABLE_POINTERS,
 178                            SectionKind::getMetadata());
 179
 180   if (!PositionIndependent) {
 181     StaticCtorSection = Ctx->getMachOSection("__TEXT", "__constructor", 0,
 182                                              SectionKind::getData());
 183     StaticDtorSection = Ctx->getMachOSection("__TEXT", "__destructor", 0,
 184                                              SectionKind::getData());
 185   } else {
 186     StaticCtorSection = Ctx->getMachOSection("__DATA", "__mod_init_func",
 187                                              MachO::S_MOD_INIT_FUNC_POINTERS,
 188                                              SectionKind::getData());
 189     StaticDtorSection = Ctx->getMachOSection("__DATA", "__mod_term_func",
 190                                              MachO::S_MOD_TERM_FUNC_POINTERS,
 191                                              SectionKind::getData());
 192   }
 193
 194   // Exception Handling.
 195   LSDASection = Ctx->getMachOSection("__TEXT", "__gcc_except_tab", 0,
 196                                      SectionKind::getReadOnlyWithRel());
 197
 198   COFFDebugSymbolsSection = nullptr;
 199   COFFDebugTypesSection = nullptr;
 200
 201   if (useCompactUnwind(T)) {
 202     CompactUnwindSection =
 203         Ctx->getMachOSection("__LD", "__compact_unwind", MachO::S_ATTR_DEBUG,
 204                              SectionKind::getReadOnly());
 205
 206     if (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86)
 207       CompactUnwindDwarfEHFrameOnly = 0x04000000;  // UNWIND_X86_64_MODE_DWARF
 208     else if (T.getArch() == Triple::aarch64)
 209       CompactUnwindDwarfEHFrameOnly = 0x03000000;  // UNWIND_ARM64_MODE_DWARF
 210     else if (T.getArch() == Triple::arm || T.getArch() == Triple::thumb)
 211       CompactUnwindDwarfEHFrameOnly = 0x04000000;  // UNWIND_ARM_MODE_DWARF
 212   }
 213
 214   // Debug Information.
 215   DwarfAccelNamesSection =
 216       Ctx->getMachOSection("__DWARF", "__apple_names", MachO::S_ATTR_DEBUG,
 217                            SectionKind::getMetadata(), "names_begin");
 218   DwarfAccelObjCSection =
 219       Ctx->getMachOSection("__DWARF", "__apple_objc", MachO::S_ATTR_DEBUG,
 220                            SectionKind::getMetadata(), "objc_begin");
 221   // 16 character section limit...
 222   DwarfAccelNamespaceSection =
 223       Ctx->getMachOSection("__DWARF", "__apple_namespac", MachO::S_ATTR_DEBUG,
 224                            SectionKind::getMetadata(), "namespac_begin");
 225   DwarfAccelTypesSection =
 226       Ctx->getMachOSection("__DWARF", "__apple_types", MachO::S_ATTR_DEBUG,
 227                            SectionKind::getMetadata(), "types_begin");
 228
 229   DwarfAbbrevSection =
 230       Ctx->getMachOSection("__DWARF", "__debug_abbrev", MachO::S_ATTR_DEBUG,
 231                            SectionKind::getMetadata(), "section_abbrev");
 232   DwarfInfoSection =
 233       Ctx->getMachOSection("__DWARF", "__debug_info", MachO::S_ATTR_DEBUG,
 234                            SectionKind::getMetadata(), "section_info");
 235   DwarfLineSection =
 236       Ctx->getMachOSection("__DWARF", "__debug_line", MachO::S_ATTR_DEBUG,
 237                            SectionKind::getMetadata(), "section_line");
 238   DwarfFrameSection =
 239       Ctx->getMachOSection("__DWARF", "__debug_frame", MachO::S_ATTR_DEBUG,
 240                            SectionKind::getMetadata());
 241   DwarfPubNamesSection =
 242       Ctx->getMachOSection("__DWARF", "__debug_pubnames", MachO::S_ATTR_DEBUG,
 243                            SectionKind::getMetadata());
 244   DwarfPubTypesSection =
 245       Ctx->getMachOSection("__DWARF", "__debug_pubtypes", MachO::S_ATTR_DEBUG,
 246                            SectionKind::getMetadata());
 247   DwarfGnuPubNamesSection =
 248       Ctx->getMachOSection("__DWARF", "__debug_gnu_pubn", MachO::S_ATTR_DEBUG,
 249                            SectionKind::getMetadata());
 250   DwarfGnuPubTypesSection =
 251       Ctx->getMachOSection("__DWARF", "__debug_gnu_pubt", MachO::S_ATTR_DEBUG,
 252                            SectionKind::getMetadata());
 253   DwarfStrSection =
 254       Ctx->getMachOSection("__DWARF", "__debug_str", MachO::S_ATTR_DEBUG,
 255                            SectionKind::getMetadata(), "info_string");
 256   DwarfLocSection =
 257       Ctx->getMachOSection("__DWARF", "__debug_loc", MachO::S_ATTR_DEBUG,
 258                            SectionKind::getMetadata(), "section_debug_loc");
 259   DwarfARangesSection =
 260       Ctx->getMachOSection("__DWARF", "__debug_aranges", MachO::S_ATTR_DEBUG,
 261                            SectionKind::getMetadata());
 262   DwarfRangesSection =
 263       Ctx->getMachOSection("__DWARF", "__debug_ranges", MachO::S_ATTR_DEBUG,
 264                            SectionKind::getMetadata(), "debug_range");
 265   DwarfMacinfoSection =
 266       Ctx->getMachOSection("__DWARF", "__debug_macinfo", MachO::S_ATTR_DEBUG,
 267                            SectionKind::getMetadata(), "debug_macinfo");
 268   DwarfDebugInlineSection =
 269       Ctx->getMachOSection("__DWARF", "__debug_inlined", MachO::S_ATTR_DEBUG,
 270                            SectionKind::getMetadata());
 271   DwarfCUIndexSection =
 272       Ctx->getMachOSection("__DWARF", "__debug_cu_index", MachO::S_ATTR_DEBUG,
 273                            SectionKind::getMetadata());
 274   DwarfTUIndexSection =
 275       Ctx->getMachOSection("__DWARF", "__debug_tu_index", MachO::S_ATTR_DEBUG,
 276                            SectionKind::getMetadata());
 277   StackMapSection = Ctx->getMachOSection("__LLVM_STACKMAPS", "__llvm_stackmaps",
 278                                          0, SectionKind::getMetadata());
 279
 280   FaultMapSection = Ctx->getMachOSection("__LLVM_FAULTMAPS", "__llvm_faultmaps",
 281                                          0, SectionKind::getMetadata());
 282
 283   TLSExtraDataSection = TLSTLVSection;
 284 }
 285
 286 void MCObjectFileInfo::initELFMCObjectFileInfo(const Triple &T) {
 287   switch (T.getArch()) {
 288   case Triple::mips:
 289   case Triple::mipsel:
 290     FDECFIEncoding = dwarf::DW_EH_PE_sdata4;
 291     break;
 292   case Triple::mips64:
 293   case Triple::mips64el:
 294     FDECFIEncoding = dwarf::DW_EH_PE_sdata8;
 295     break;
 296   case Triple::x86_64:
 297     FDECFIEncoding = dwarf::DW_EH_PE_pcrel |
 298                      ((CMModel == CodeModel::Large) ? dwarf::DW_EH_PE_sdata8
 299                                                     : dwarf::DW_EH_PE_sdata4);
 300     break;
 301   default:
 302     FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 303     break;
 304   }
 305
 306   switch (T.getArch()) {
 307   case Triple::arm:
 308   case Triple::armeb:
 309   case Triple::thumb:
 310   case Triple::thumbeb:
 311     if (Ctx->getAsmInfo()->getExceptionHandlingType() == ExceptionHandling::ARM)
 312       break;
 313     // Fallthrough if not using EHABI
 314   case Triple::ppc:
 315   case Triple::x86:
 316     PersonalityEncoding = PositionIndependent
 317                               ? dwarf::DW_EH_PE_indirect |
 318                                     dwarf::DW_EH_PE_pcrel |
 319                                     dwarf::DW_EH_PE_sdata4
 320                               : dwarf::DW_EH_PE_absptr;
 321     LSDAEncoding = PositionIndependent
 322                        ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
 323                        : dwarf::DW_EH_PE_absptr;
 324     TTypeEncoding = PositionIndependent
 325                         ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 326                               dwarf::DW_EH_PE_sdata4
 327                         : dwarf::DW_EH_PE_absptr;
 328     break;
 329   case Triple::x86_64:
 330     if (PositionIndependent) {
 331       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 332         ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
 333          ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
 334       LSDAEncoding = dwarf::DW_EH_PE_pcrel |
 335         (CMModel == CodeModel::Small
 336          ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
 337       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 338         ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
 339          ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
 340     } else {
 341       PersonalityEncoding =
 342         (CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
 343         ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
 344       LSDAEncoding = (CMModel == CodeModel::Small)
 345         ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
 346       TTypeEncoding = (CMModel == CodeModel::Small)
 347         ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
 348     }
 349     break;
 350   case Triple::hexagon:
 351     PersonalityEncoding = dwarf::DW_EH_PE_absptr;
 352     LSDAEncoding = dwarf::DW_EH_PE_absptr;
 353     FDECFIEncoding = dwarf::DW_EH_PE_absptr;
 354     TTypeEncoding = dwarf::DW_EH_PE_absptr;
 355     if (PositionIndependent) {
 356       PersonalityEncoding |= dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel;
 357       LSDAEncoding |= dwarf::DW_EH_PE_pcrel;
 358       FDECFIEncoding |= dwarf::DW_EH_PE_pcrel;
 359       TTypeEncoding |= dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel;
 360     }
 361     break;
 362   case Triple::aarch64:
 363   case Triple::aarch64_be:
 364     // The small model guarantees static code/data size < 4GB, but not where it
 365     // will be in memory. Most of these could end up >2GB away so even a signed
 366     // pc-relative 32-bit address is insufficient, theoretically.
 367     if (PositionIndependent) {
 368       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 369         dwarf::DW_EH_PE_sdata8;
 370       LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8;
 371       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 372         dwarf::DW_EH_PE_sdata8;
 373     } else {
 374       PersonalityEncoding = dwarf::DW_EH_PE_absptr;
 375       LSDAEncoding = dwarf::DW_EH_PE_absptr;
 376       TTypeEncoding = dwarf::DW_EH_PE_absptr;
 377     }
 378     break;
 379   case Triple::lanai:
 380     LSDAEncoding = dwarf::DW_EH_PE_absptr;
 381     PersonalityEncoding = dwarf::DW_EH_PE_absptr;
 382     TTypeEncoding = dwarf::DW_EH_PE_absptr;
 383     break;
 384   case Triple::mips:
 385   case Triple::mipsel:
 386   case Triple::mips64:
 387   case Triple::mips64el:
 388     // MIPS uses indirect pointer to refer personality functions and types, so
 389     // that the eh_frame section can be read-only. DW.ref.personality will be
 390     // generated for relocation.
 391     PersonalityEncoding = dwarf::DW_EH_PE_indirect;
 392     // FIXME: The N64 ABI probably ought to use DW_EH_PE_sdata8 but we can't
 393     //        identify N64 from just a triple.
 394     TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 395                     dwarf::DW_EH_PE_sdata4;
 396     // We don't support PC-relative LSDA references in GAS so we use the default
 397     // DW_EH_PE_absptr for those.
 398     break;
 399   case Triple::ppc64:
 400   case Triple::ppc64le:
 401     PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 402       dwarf::DW_EH_PE_udata8;
 403     LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
 404     TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 405       dwarf::DW_EH_PE_udata8;
 406     break;
 407   case Triple::sparcel:
 408   case Triple::sparc:
 409     if (PositionIndependent) {
 410       LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 411       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 412         dwarf::DW_EH_PE_sdata4;
 413       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 414         dwarf::DW_EH_PE_sdata4;
 415     } else {
 416       LSDAEncoding = dwarf::DW_EH_PE_absptr;
 417       PersonalityEncoding = dwarf::DW_EH_PE_absptr;
 418       TTypeEncoding = dwarf::DW_EH_PE_absptr;
 419     }
 420     break;
 421   case Triple::sparcv9:
 422     LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 423     if (PositionIndependent) {
 424       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 425         dwarf::DW_EH_PE_sdata4;
 426       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 427         dwarf::DW_EH_PE_sdata4;
 428     } else {
 429       PersonalityEncoding = dwarf::DW_EH_PE_absptr;
 430       TTypeEncoding = dwarf::DW_EH_PE_absptr;
 431     }
 432     break;
 433   case Triple::systemz:
 434     // All currently-defined code models guarantee that 4-byte PC-relative
 435     // values will be in range.
 436     if (PositionIndependent) {
 437       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 438         dwarf::DW_EH_PE_sdata4;
 439       LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 440       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 441         dwarf::DW_EH_PE_sdata4;
 442     } else {
 443       PersonalityEncoding = dwarf::DW_EH_PE_absptr;
 444       LSDAEncoding = dwarf::DW_EH_PE_absptr;
 445       TTypeEncoding = dwarf::DW_EH_PE_absptr;
 446     }
 447     break;
 448   default:
 449     break;
 450   }
 451
 452   unsigned EHSectionType = T.getArch() == Triple::x86_64
 453                                ? ELF::SHT_X86_64_UNWIND
 454                                : ELF::SHT_PROGBITS;
 455
 456   // Solaris requires different flags for .eh_frame to seemingly every other
 457   // platform.
 458   unsigned EHSectionFlags = ELF::SHF_ALLOC;
 459   if (T.isOSSolaris() && T.getArch() != Triple::x86_64)
 460     EHSectionFlags |= ELF::SHF_WRITE;
 461
 462   // ELF
 463   BSSSection = Ctx->getELFSection(".bss", ELF::SHT_NOBITS,
 464                                   ELF::SHF_WRITE | ELF::SHF_ALLOC);
 465
 466   TextSection = Ctx->getELFSection(".text", ELF::SHT_PROGBITS,
 467                                    ELF::SHF_EXECINSTR | ELF::SHF_ALLOC);
 468
 469   DataSection = Ctx->getELFSection(".data", ELF::SHT_PROGBITS,
 470                                    ELF::SHF_WRITE | ELF::SHF_ALLOC);
 471
 472   ReadOnlySection =
 473       Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
 474
 475   TLSDataSection =
 476       Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS,
 477                          ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE);
 478
 479   TLSBSSSection = Ctx->getELFSection(
 480       ".tbss", ELF::SHT_NOBITS, ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE);
 481
 482   DataRelROSection = Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS,
 483                                         ELF::SHF_ALLOC | ELF::SHF_WRITE);
 484
 485   MergeableConst4Section =
 486       Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS,
 487                          ELF::SHF_ALLOC | ELF::SHF_MERGE, 4, "");
 488
 489   MergeableConst8Section =
 490       Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS,
 491                          ELF::SHF_ALLOC | ELF::SHF_MERGE, 8, "");
 492
 493   MergeableConst16Section =
 494       Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS,
 495                          ELF::SHF_ALLOC | ELF::SHF_MERGE, 16, "");
 496
 497   MergeableConst32Section =
 498       Ctx->getELFSection(".rodata.cst32", ELF::SHT_PROGBITS,
 499                          ELF::SHF_ALLOC | ELF::SHF_MERGE, 32, "");
 500
 501   StaticCtorSection = Ctx->getELFSection(".ctors", ELF::SHT_PROGBITS,
 502                                          ELF::SHF_ALLOC | ELF::SHF_WRITE);
 503
 504   StaticDtorSection = Ctx->getELFSection(".dtors", ELF::SHT_PROGBITS,
 505                                          ELF::SHF_ALLOC | ELF::SHF_WRITE);
 506
 507   // Exception Handling Sections.
 508
 509   // FIXME: We're emitting LSDA info into a readonly section on ELF, even though
 510   // it contains relocatable pointers.  In PIC mode, this is probably a big
 511   // runtime hit for C++ apps.  Either the contents of the LSDA need to be
 512   // adjusted or this should be a data section.
 513   LSDASection = Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS,
 514                                    ELF::SHF_ALLOC);
 515
 516   COFFDebugSymbolsSection = nullptr;
 517   COFFDebugTypesSection = nullptr;
 518
 519   // Debug Info Sections.
 520   DwarfAbbrevSection = Ctx->getELFSection(".debug_abbrev", ELF::SHT_PROGBITS, 0,
 521                                           "section_abbrev");
 522   DwarfInfoSection =
 523       Ctx->getELFSection(".debug_info", ELF::SHT_PROGBITS, 0, "section_info");
 524   DwarfLineSection = Ctx->getELFSection(".debug_line", ELF::SHT_PROGBITS, 0);
 525   DwarfFrameSection = Ctx->getELFSection(".debug_frame", ELF::SHT_PROGBITS, 0);
 526   DwarfPubNamesSection =
 527       Ctx->getELFSection(".debug_pubnames", ELF::SHT_PROGBITS, 0);
 528   DwarfPubTypesSection =
 529       Ctx->getELFSection(".debug_pubtypes", ELF::SHT_PROGBITS, 0);
 530   DwarfGnuPubNamesSection =
 531       Ctx->getELFSection(".debug_gnu_pubnames", ELF::SHT_PROGBITS, 0);
 532   DwarfGnuPubTypesSection =
 533       Ctx->getELFSection(".debug_gnu_pubtypes", ELF::SHT_PROGBITS, 0);
 534   DwarfStrSection =
 535       Ctx->getELFSection(".debug_str", ELF::SHT_PROGBITS,
 536                          ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, "");
 537   DwarfLocSection = Ctx->getELFSection(".debug_loc", ELF::SHT_PROGBITS, 0);
 538   DwarfARangesSection =
 539       Ctx->getELFSection(".debug_aranges", ELF::SHT_PROGBITS, 0);
 540   DwarfRangesSection =
 541       Ctx->getELFSection(".debug_ranges", ELF::SHT_PROGBITS, 0, "debug_range");
 542   DwarfMacinfoSection = Ctx->getELFSection(".debug_macinfo", ELF::SHT_PROGBITS,
 543                                            0, "debug_macinfo");
 544
 545   // DWARF5 Experimental Debug Info
 546
 547   // Accelerator Tables
 548   DwarfAccelNamesSection =
 549       Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0, "names_begin");
 550   DwarfAccelObjCSection =
 551       Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0, "objc_begin");
 552   DwarfAccelNamespaceSection = Ctx->getELFSection(
 553       ".apple_namespaces", ELF::SHT_PROGBITS, 0, "namespac_begin");
 554   DwarfAccelTypesSection =
 555       Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0, "types_begin");
 556
 557   // Fission Sections
 558   DwarfInfoDWOSection =
 559       Ctx->getELFSection(".debug_info.dwo", ELF::SHT_PROGBITS, 0);
 560   DwarfTypesDWOSection =
 561       Ctx->getELFSection(".debug_types.dwo", ELF::SHT_PROGBITS, 0);
 562   DwarfAbbrevDWOSection =
 563       Ctx->getELFSection(".debug_abbrev.dwo", ELF::SHT_PROGBITS, 0);
 564   DwarfStrDWOSection =
 565       Ctx->getELFSection(".debug_str.dwo", ELF::SHT_PROGBITS,
 566                          ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, "");
 567   DwarfLineDWOSection =
 568       Ctx->getELFSection(".debug_line.dwo", ELF::SHT_PROGBITS, 0);
 569   DwarfLocDWOSection =
 570       Ctx->getELFSection(".debug_loc.dwo", ELF::SHT_PROGBITS, 0, "skel_loc");
 571   DwarfStrOffDWOSection =
 572       Ctx->getELFSection(".debug_str_offsets.dwo", ELF::SHT_PROGBITS, 0);
 573   DwarfAddrSection =
 574       Ctx->getELFSection(".debug_addr", ELF::SHT_PROGBITS, 0, "addr_sec");
 575
 576   // DWP Sections
 577   DwarfCUIndexSection =
 578       Ctx->getELFSection(".debug_cu_index", ELF::SHT_PROGBITS, 0);
 579   DwarfTUIndexSection =
 580       Ctx->getELFSection(".debug_tu_index", ELF::SHT_PROGBITS, 0);
 581
 582   StackMapSection =
 583       Ctx->getELFSection(".llvm_stackmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
 584
 585   FaultMapSection =
 586       Ctx->getELFSection(".llvm_faultmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
 587
 588   EHFrameSection =
 589       Ctx->getELFSection(".eh_frame", EHSectionType, EHSectionFlags);
 590 }
 591
 592 void MCObjectFileInfo::initCOFFMCObjectFileInfo(const Triple &T) {
 593   EHFrameSection = Ctx->getCOFFSection(
 594       ".eh_frame", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 595                        COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
 596       SectionKind::getData());
 597
 598   // Set the `IMAGE_SCN_MEM_16BIT` flag when compiling for thumb mode.  This is
 599   // used to indicate to the linker that the text segment contains thumb instructions
 600   // and to set the ISA selection bit for calls accordingly.
 601   const bool IsThumb = T.getArch() == Triple::thumb;
 602
 603   CommDirectiveSupportsAlignment = true;
 604
 605   // COFF
 606   BSSSection = Ctx->getCOFFSection(
 607       ".bss", COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA |
 608                   COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
 609       SectionKind::getBSS());
 610   TextSection = Ctx->getCOFFSection(
 611       ".text",
 612       (IsThumb ? COFF::IMAGE_SCN_MEM_16BIT : (COFF::SectionCharacteristics)0) |
 613           COFF::IMAGE_SCN_CNT_CODE | COFF::IMAGE_SCN_MEM_EXECUTE |
 614           COFF::IMAGE_SCN_MEM_READ,
 615       SectionKind::getText());
 616   DataSection = Ctx->getCOFFSection(
 617       ".data", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ |
 618                    COFF::IMAGE_SCN_MEM_WRITE,
 619       SectionKind::getData());
 620   ReadOnlySection = Ctx->getCOFFSection(
 621       ".rdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
 622       SectionKind::getReadOnly());
 623
 624   if (T.isKnownWindowsMSVCEnvironment() || T.isWindowsItaniumEnvironment()) {
 625     StaticCtorSection =
 626         Ctx->getCOFFSection(".CRT$XCU", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 627                                             COFF::IMAGE_SCN_MEM_READ,
 628                             SectionKind::getReadOnly());
 629     StaticDtorSection =
 630         Ctx->getCOFFSection(".CRT$XTX", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 631                                             COFF::IMAGE_SCN_MEM_READ,
 632                             SectionKind::getReadOnly());
 633   } else {
 634     StaticCtorSection = Ctx->getCOFFSection(
 635         ".ctors", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 636                       COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
 637         SectionKind::getData());
 638     StaticDtorSection = Ctx->getCOFFSection(
 639         ".dtors", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 640                       COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
 641         SectionKind::getData());
 642   }
 643
 644   // FIXME: We're emitting LSDA info into a readonly section on COFF, even
 645   // though it contains relocatable pointers.  In PIC mode, this is probably a
 646   // big runtime hit for C++ apps.  Either the contents of the LSDA need to be
 647   // adjusted or this should be a data section.
 648   if (T.getArch() == Triple::x86_64) {
 649     // On Windows 64 with SEH, the LSDA is emitted into the .xdata section
 650     LSDASection = nullptr;
 651   } else {
 652     LSDASection = Ctx->getCOFFSection(".gcc_except_table",
 653                                       COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 654                                           COFF::IMAGE_SCN_MEM_READ,
 655                                       SectionKind::getReadOnly());
 656   }
 657
 658   // Debug info.
 659   COFFDebugSymbolsSection =
 660       Ctx->getCOFFSection(".debug$S", (COFF::IMAGE_SCN_MEM_DISCARDABLE |
 661                                        COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 662                                        COFF::IMAGE_SCN_MEM_READ),
 663                           SectionKind::getMetadata());
 664   COFFDebugTypesSection =
 665       Ctx->getCOFFSection(".debug$T", (COFF::IMAGE_SCN_MEM_DISCARDABLE |
 666                                        COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 667                                        COFF::IMAGE_SCN_MEM_READ),
 668                           SectionKind::getMetadata());
 669
 670   DwarfAbbrevSection = Ctx->getCOFFSection(
 671       ".debug_abbrev",
 672       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 673           COFF::IMAGE_SCN_MEM_READ,
 674       SectionKind::getMetadata(), "section_abbrev");
 675   DwarfInfoSection = Ctx->getCOFFSection(
 676       ".debug_info",
 677       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 678           COFF::IMAGE_SCN_MEM_READ,
 679       SectionKind::getMetadata(), "section_info");
 680   DwarfLineSection = Ctx->getCOFFSection(
 681       ".debug_line",
 682       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 683           COFF::IMAGE_SCN_MEM_READ,
 684       SectionKind::getMetadata(), "section_line");
 685
 686   DwarfFrameSection = Ctx->getCOFFSection(
 687       ".debug_frame",
 688       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 689           COFF::IMAGE_SCN_MEM_READ,
 690       SectionKind::getMetadata());
 691   DwarfPubNamesSection = Ctx->getCOFFSection(
 692       ".debug_pubnames",
 693       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 694           COFF::IMAGE_SCN_MEM_READ,
 695       SectionKind::getMetadata());
 696   DwarfPubTypesSection = Ctx->getCOFFSection(
 697       ".debug_pubtypes",
 698       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 699           COFF::IMAGE_SCN_MEM_READ,
 700       SectionKind::getMetadata());
 701   DwarfGnuPubNamesSection = Ctx->getCOFFSection(
 702       ".debug_gnu_pubnames",
 703       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 704           COFF::IMAGE_SCN_MEM_READ,
 705       SectionKind::getMetadata());
 706   DwarfGnuPubTypesSection = Ctx->getCOFFSection(
 707       ".debug_gnu_pubtypes",
 708       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 709           COFF::IMAGE_SCN_MEM_READ,
 710       SectionKind::getMetadata());
 711   DwarfStrSection = Ctx->getCOFFSection(
 712       ".debug_str",
 713       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 714           COFF::IMAGE_SCN_MEM_READ,
 715       SectionKind::getMetadata(), "info_string");
 716   DwarfLocSection = Ctx->getCOFFSection(
 717       ".debug_loc",
 718       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 719           COFF::IMAGE_SCN_MEM_READ,
 720       SectionKind::getMetadata(), "section_debug_loc");
 721   DwarfARangesSection = Ctx->getCOFFSection(
 722       ".debug_aranges",
 723       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 724           COFF::IMAGE_SCN_MEM_READ,
 725       SectionKind::getMetadata());
 726   DwarfRangesSection = Ctx->getCOFFSection(
 727       ".debug_ranges",
 728       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 729           COFF::IMAGE_SCN_MEM_READ,
 730       SectionKind::getMetadata(), "debug_range");
 731   DwarfMacinfoSection = Ctx->getCOFFSection(
 732       ".debug_macinfo",
 733       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 734           COFF::IMAGE_SCN_MEM_READ,
 735       SectionKind::getMetadata(), "debug_macinfo");
 736   DwarfInfoDWOSection = Ctx->getCOFFSection(
 737       ".debug_info.dwo",
 738       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 739           COFF::IMAGE_SCN_MEM_READ,
 740       SectionKind::getMetadata(), "section_info_dwo");
 741   DwarfTypesDWOSection = Ctx->getCOFFSection(
 742       ".debug_types.dwo",
 743       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 744           COFF::IMAGE_SCN_MEM_READ,
 745       SectionKind::getMetadata(), "section_types_dwo");
 746   DwarfAbbrevDWOSection = Ctx->getCOFFSection(
 747       ".debug_abbrev.dwo",
 748       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 749           COFF::IMAGE_SCN_MEM_READ,
 750       SectionKind::getMetadata(), "section_abbrev_dwo");
 751   DwarfStrDWOSection = Ctx->getCOFFSection(
 752       ".debug_str.dwo",
 753       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 754           COFF::IMAGE_SCN_MEM_READ,
 755       SectionKind::getMetadata(), "skel_string");
 756   DwarfLineDWOSection = Ctx->getCOFFSection(
 757       ".debug_line.dwo",
 758       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 759           COFF::IMAGE_SCN_MEM_READ,
 760       SectionKind::getMetadata());
 761   DwarfLocDWOSection = Ctx->getCOFFSection(
 762       ".debug_loc.dwo",
 763       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 764           COFF::IMAGE_SCN_MEM_READ,
 765       SectionKind::getMetadata(), "skel_loc");
 766   DwarfStrOffDWOSection = Ctx->getCOFFSection(
 767       ".debug_str_offsets.dwo",
 768       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 769           COFF::IMAGE_SCN_MEM_READ,
 770       SectionKind::getMetadata());
 771   DwarfAddrSection = Ctx->getCOFFSection(
 772       ".debug_addr",
 773       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 774           COFF::IMAGE_SCN_MEM_READ,
 775       SectionKind::getMetadata(), "addr_sec");
 776   DwarfCUIndexSection = Ctx->getCOFFSection(
 777       ".debug_cu_index",
 778       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 779           COFF::IMAGE_SCN_MEM_READ,
 780       SectionKind::getMetadata());
 781   DwarfTUIndexSection = Ctx->getCOFFSection(
 782       ".debug_tu_index",
 783       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 784           COFF::IMAGE_SCN_MEM_READ,
 785       SectionKind::getMetadata());
 786   DwarfAccelNamesSection = Ctx->getCOFFSection(
 787       ".apple_names",
 788       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 789           COFF::IMAGE_SCN_MEM_READ,
 790       SectionKind::getMetadata(), "names_begin");
 791   DwarfAccelNamespaceSection = Ctx->getCOFFSection(
 792       ".apple_namespaces",
 793       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 794           COFF::IMAGE_SCN_MEM_READ,
 795       SectionKind::getMetadata(), "namespac_begin");
 796   DwarfAccelTypesSection = Ctx->getCOFFSection(
 797       ".apple_types",
 798       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 799           COFF::IMAGE_SCN_MEM_READ,
 800       SectionKind::getMetadata(), "types_begin");
 801   DwarfAccelObjCSection = Ctx->getCOFFSection(
 802       ".apple_objc",
 803       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 804           COFF::IMAGE_SCN_MEM_READ,
 805       SectionKind::getMetadata(), "objc_begin");
 806
 807   DrectveSection = Ctx->getCOFFSection(
 808       ".drectve", COFF::IMAGE_SCN_LNK_INFO | COFF::IMAGE_SCN_LNK_REMOVE,
 809       SectionKind::getMetadata());
 810
 811   PDataSection = Ctx->getCOFFSection(
 812       ".pdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
 813       SectionKind::getData());
 814
 815   XDataSection = Ctx->getCOFFSection(
 816       ".xdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
 817       SectionKind::getData());
 818
 819   SXDataSection = Ctx->getCOFFSection(".sxdata", COFF::IMAGE_SCN_LNK_INFO,
 820                                       SectionKind::getMetadata());
 821
 822   TLSDataSection = Ctx->getCOFFSection(
 823       ".tls$", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ |
 824                    COFF::IMAGE_SCN_MEM_WRITE,
 825       SectionKind::getData());
 826
 827   StackMapSection = Ctx->getCOFFSection(".llvm_stackmaps",
 828                                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 829                                             COFF::IMAGE_SCN_MEM_READ,
 830                                         SectionKind::getReadOnly());
 831 }
 832
 833 void MCObjectFileInfo::InitMCObjectFileInfo(const Triple &TheTriple, bool PIC,
 834                                             CodeModel::Model cm,
 835                                             MCContext &ctx) {
 836   PositionIndependent = PIC;
 837   CMModel = cm;
 838   Ctx = &ctx;
 839
 840   // Common.
 841   CommDirectiveSupportsAlignment = true;
 842   SupportsWeakOmittedEHFrame = true;
 843   SupportsCompactUnwindWithoutEHFrame = false;
 844   OmitDwarfIfHaveCompactUnwind = false;
 845
 846   PersonalityEncoding = LSDAEncoding = FDECFIEncoding = TTypeEncoding =
 847       dwarf::DW_EH_PE_absptr;
 848
 849   CompactUnwindDwarfEHFrameOnly = 0;
 850
 851   EHFrameSection = nullptr;             // Created on demand.
 852   CompactUnwindSection = nullptr;       // Used only by selected targets.
 853   DwarfAccelNamesSection = nullptr;     // Used only by selected targets.
 854   DwarfAccelObjCSection = nullptr;      // Used only by selected targets.
 855   DwarfAccelNamespaceSection = nullptr; // Used only by selected targets.
 856   DwarfAccelTypesSection = nullptr;     // Used only by selected targets.
 857
 858   TT = TheTriple;
 859
 860   switch (TT.getObjectFormat()) {
 861   case Triple::MachO:
 862     Env = IsMachO;
 863     initMachOMCObjectFileInfo(TT);
 864     break;
 865   case Triple::COFF:
 866     if (!TT.isOSWindows())
 867       report_fatal_error(
 868           "Cannot initialize MC for non-Windows COFF object files.");
 869
 870     Env = IsCOFF;
 871     initCOFFMCObjectFileInfo(TT);
 872     break;
 873   case Triple::ELF:
 874     Env = IsELF;
 875     initELFMCObjectFileInfo(TT);
 876     break;
 877   case Triple::UnknownObjectFormat:
 878     report_fatal_error("Cannot initialize MC for unknown object file format.");
 879     break;
 880   }
 881 }
 882
 883 MCSection *MCObjectFileInfo::getDwarfTypesSection(uint64_t Hash) const {
 884   return Ctx->getELFSection(".debug_types", ELF::SHT_PROGBITS, ELF::SHF_GROUP,
 885                             0, utostr(Hash));
 886 }