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/BinaryFormat/COFF.h"
  14 #include "llvm/BinaryFormat/ELF.h"
  15 #include "llvm/MC/MCAsmInfo.h"
  16 #include "llvm/MC/MCContext.h"
  17 #include "llvm/MC/MCSection.h"
  18 #include "llvm/MC/MCSectionCOFF.h"
  19 #include "llvm/MC/MCSectionELF.h"
  20 #include "llvm/MC/MCSectionMachO.h"
  21 #include "llvm/MC/MCSectionWasm.h"
  22
  23 using namespace llvm;
  24
  25 static bool useCompactUnwind(const Triple &T) {
  26   // Only on darwin.
  27   if (!T.isOSDarwin())
  28     return false;
  29
  30   // aarch64 always has it.
  31   if (T.getArch() == Triple::aarch64)
  32     return true;
  33
  34   // armv7k always has it.
  35   if (T.isWatchABI())
  36     return true;
  37
  38   // Use it on newer version of OS X.
  39   if (T.isMacOSX() && !T.isMacOSXVersionLT(10, 6))
  40     return true;
  41
  42   // And the iOS simulator.
  43   if (T.isiOS() &&
  44       (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86))
  45     return true;
  46
  47   return false;
  48 }
  49
  50 void MCObjectFileInfo::initMachOMCObjectFileInfo(const Triple &T) {
  51   // MachO
  52   SupportsWeakOmittedEHFrame = false;
  53
  54   EHFrameSection = Ctx->getMachOSection(
  55       "__TEXT", "__eh_frame",
  56       MachO::S_COALESCED | MachO::S_ATTR_NO_TOC |
  57           MachO::S_ATTR_STRIP_STATIC_SYMS | MachO::S_ATTR_LIVE_SUPPORT,
  58       SectionKind::getReadOnly());
  59
  60   if (T.isOSDarwin() && T.getArch() == Triple::aarch64)
  61     SupportsCompactUnwindWithoutEHFrame = true;
  62
  63   if (T.isWatchABI())
  64     OmitDwarfIfHaveCompactUnwind = true;
  65
  66   PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel
  67     | dwarf::DW_EH_PE_sdata4;
  68   LSDAEncoding = FDECFIEncoding = dwarf::DW_EH_PE_pcrel;
  69   TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
  70     dwarf::DW_EH_PE_sdata4;
  71
  72   // .comm doesn't support alignment before Leopard.
  73   if (T.isMacOSX() && T.isMacOSXVersionLT(10, 5))
  74     CommDirectiveSupportsAlignment = false;
  75
  76   TextSection // .text
  77     = Ctx->getMachOSection("__TEXT", "__text",
  78                            MachO::S_ATTR_PURE_INSTRUCTIONS,
  79                            SectionKind::getText());
  80   DataSection // .data
  81       = Ctx->getMachOSection("__DATA", "__data", 0, SectionKind::getData());
  82
  83   // BSSSection might not be expected initialized on msvc.
  84   BSSSection = nullptr;
  85
  86   TLSDataSection // .tdata
  87       = Ctx->getMachOSection("__DATA", "__thread_data",
  88                              MachO::S_THREAD_LOCAL_REGULAR,
  89                              SectionKind::getData());
  90   TLSBSSSection // .tbss
  91     = Ctx->getMachOSection("__DATA", "__thread_bss",
  92                            MachO::S_THREAD_LOCAL_ZEROFILL,
  93                            SectionKind::getThreadBSS());
  94
  95   // TODO: Verify datarel below.
  96   TLSTLVSection // .tlv
  97       = Ctx->getMachOSection("__DATA", "__thread_vars",
  98                              MachO::S_THREAD_LOCAL_VARIABLES,
  99                              SectionKind::getData());
 100
 101   TLSThreadInitSection = Ctx->getMachOSection(
 102       "__DATA", "__thread_init", MachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS,
 103       SectionKind::getData());
 104
 105   CStringSection // .cstring
 106     = Ctx->getMachOSection("__TEXT", "__cstring",
 107                            MachO::S_CSTRING_LITERALS,
 108                            SectionKind::getMergeable1ByteCString());
 109   UStringSection
 110     = Ctx->getMachOSection("__TEXT","__ustring", 0,
 111                            SectionKind::getMergeable2ByteCString());
 112   FourByteConstantSection // .literal4
 113     = Ctx->getMachOSection("__TEXT", "__literal4",
 114                            MachO::S_4BYTE_LITERALS,
 115                            SectionKind::getMergeableConst4());
 116   EightByteConstantSection // .literal8
 117     = Ctx->getMachOSection("__TEXT", "__literal8",
 118                            MachO::S_8BYTE_LITERALS,
 119                            SectionKind::getMergeableConst8());
 120
 121   SixteenByteConstantSection // .literal16
 122       = Ctx->getMachOSection("__TEXT", "__literal16",
 123                              MachO::S_16BYTE_LITERALS,
 124                              SectionKind::getMergeableConst16());
 125
 126   ReadOnlySection  // .const
 127     = Ctx->getMachOSection("__TEXT", "__const", 0,
 128                            SectionKind::getReadOnly());
 129
 130   // If the target is not powerpc, map the coal sections to the non-coal
 131   // sections.
 132   //
 133   // "__TEXT/__textcoal_nt" => section "__TEXT/__text"
 134   // "__TEXT/__const_coal"  => section "__TEXT/__const"
 135   // "__DATA/__datacoal_nt" => section "__DATA/__data"
 136   Triple::ArchType ArchTy = T.getArch();
 137
 138   if (ArchTy == Triple::ppc || ArchTy == Triple::ppc64) {
 139     TextCoalSection
 140       = Ctx->getMachOSection("__TEXT", "__textcoal_nt",
 141                              MachO::S_COALESCED |
 142                              MachO::S_ATTR_PURE_INSTRUCTIONS,
 143                              SectionKind::getText());
 144     ConstTextCoalSection
 145       = Ctx->getMachOSection("__TEXT", "__const_coal",
 146                              MachO::S_COALESCED,
 147                              SectionKind::getReadOnly());
 148     DataCoalSection = Ctx->getMachOSection(
 149         "__DATA", "__datacoal_nt", MachO::S_COALESCED, SectionKind::getData());
 150   } else {
 151     TextCoalSection = TextSection;
 152     ConstTextCoalSection = ReadOnlySection;
 153     DataCoalSection = DataSection;
 154   }
 155
 156   ConstDataSection  // .const_data
 157     = Ctx->getMachOSection("__DATA", "__const", 0,
 158                            SectionKind::getReadOnlyWithRel());
 159   DataCommonSection
 160     = Ctx->getMachOSection("__DATA","__common",
 161                            MachO::S_ZEROFILL,
 162                            SectionKind::getBSS());
 163   DataBSSSection
 164     = Ctx->getMachOSection("__DATA","__bss", MachO::S_ZEROFILL,
 165                            SectionKind::getBSS());
 166
 167
 168   LazySymbolPointerSection
 169     = Ctx->getMachOSection("__DATA", "__la_symbol_ptr",
 170                            MachO::S_LAZY_SYMBOL_POINTERS,
 171                            SectionKind::getMetadata());
 172   NonLazySymbolPointerSection
 173     = Ctx->getMachOSection("__DATA", "__nl_symbol_ptr",
 174                            MachO::S_NON_LAZY_SYMBOL_POINTERS,
 175                            SectionKind::getMetadata());
 176
 177   ThreadLocalPointerSection
 178     = Ctx->getMachOSection("__DATA", "__thread_ptr",
 179                            MachO::S_THREAD_LOCAL_VARIABLE_POINTERS,
 180                            SectionKind::getMetadata());
 181
 182   // Exception Handling.
 183   LSDASection = Ctx->getMachOSection("__TEXT", "__gcc_except_tab", 0,
 184                                      SectionKind::getReadOnlyWithRel());
 185
 186   COFFDebugSymbolsSection = nullptr;
 187   COFFDebugTypesSection = nullptr;
 188
 189   if (useCompactUnwind(T)) {
 190     CompactUnwindSection =
 191         Ctx->getMachOSection("__LD", "__compact_unwind", MachO::S_ATTR_DEBUG,
 192                              SectionKind::getReadOnly());
 193
 194     if (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86)
 195       CompactUnwindDwarfEHFrameOnly = 0x04000000;  // UNWIND_X86_64_MODE_DWARF
 196     else if (T.getArch() == Triple::aarch64)
 197       CompactUnwindDwarfEHFrameOnly = 0x03000000;  // UNWIND_ARM64_MODE_DWARF
 198     else if (T.getArch() == Triple::arm || T.getArch() == Triple::thumb)
 199       CompactUnwindDwarfEHFrameOnly = 0x04000000;  // UNWIND_ARM_MODE_DWARF
 200   }
 201
 202   // Debug Information.
 203   DwarfAccelNamesSection =
 204       Ctx->getMachOSection("__DWARF", "__apple_names", MachO::S_ATTR_DEBUG,
 205                            SectionKind::getMetadata(), "names_begin");
 206   DwarfAccelObjCSection =
 207       Ctx->getMachOSection("__DWARF", "__apple_objc", MachO::S_ATTR_DEBUG,
 208                            SectionKind::getMetadata(), "objc_begin");
 209   // 16 character section limit...
 210   DwarfAccelNamespaceSection =
 211       Ctx->getMachOSection("__DWARF", "__apple_namespac", MachO::S_ATTR_DEBUG,
 212                            SectionKind::getMetadata(), "namespac_begin");
 213   DwarfAccelTypesSection =
 214       Ctx->getMachOSection("__DWARF", "__apple_types", MachO::S_ATTR_DEBUG,
 215                            SectionKind::getMetadata(), "types_begin");
 216
 217   DwarfAbbrevSection =
 218       Ctx->getMachOSection("__DWARF", "__debug_abbrev", MachO::S_ATTR_DEBUG,
 219                            SectionKind::getMetadata(), "section_abbrev");
 220   DwarfInfoSection =
 221       Ctx->getMachOSection("__DWARF", "__debug_info", MachO::S_ATTR_DEBUG,
 222                            SectionKind::getMetadata(), "section_info");
 223   DwarfLineSection =
 224       Ctx->getMachOSection("__DWARF", "__debug_line", MachO::S_ATTR_DEBUG,
 225                            SectionKind::getMetadata(), "section_line");
 226   DwarfFrameSection =
 227       Ctx->getMachOSection("__DWARF", "__debug_frame", MachO::S_ATTR_DEBUG,
 228                            SectionKind::getMetadata());
 229   DwarfPubNamesSection =
 230       Ctx->getMachOSection("__DWARF", "__debug_pubnames", MachO::S_ATTR_DEBUG,
 231                            SectionKind::getMetadata());
 232   DwarfPubTypesSection =
 233       Ctx->getMachOSection("__DWARF", "__debug_pubtypes", MachO::S_ATTR_DEBUG,
 234                            SectionKind::getMetadata());
 235   DwarfGnuPubNamesSection =
 236       Ctx->getMachOSection("__DWARF", "__debug_gnu_pubn", MachO::S_ATTR_DEBUG,
 237                            SectionKind::getMetadata());
 238   DwarfGnuPubTypesSection =
 239       Ctx->getMachOSection("__DWARF", "__debug_gnu_pubt", MachO::S_ATTR_DEBUG,
 240                            SectionKind::getMetadata());
 241   DwarfStrSection =
 242       Ctx->getMachOSection("__DWARF", "__debug_str", MachO::S_ATTR_DEBUG,
 243                            SectionKind::getMetadata(), "info_string");
 244   DwarfStrOffSection =
 245       Ctx->getMachOSection("__DWARF", "__debug_str_offs", MachO::S_ATTR_DEBUG,
 246                            SectionKind::getMetadata(), "section_str_off");
 247   DwarfLocSection =
 248       Ctx->getMachOSection("__DWARF", "__debug_loc", MachO::S_ATTR_DEBUG,
 249                            SectionKind::getMetadata(), "section_debug_loc");
 250   DwarfARangesSection =
 251       Ctx->getMachOSection("__DWARF", "__debug_aranges", MachO::S_ATTR_DEBUG,
 252                            SectionKind::getMetadata());
 253   DwarfRangesSection =
 254       Ctx->getMachOSection("__DWARF", "__debug_ranges", MachO::S_ATTR_DEBUG,
 255                            SectionKind::getMetadata(), "debug_range");
 256   DwarfMacinfoSection =
 257       Ctx->getMachOSection("__DWARF", "__debug_macinfo", MachO::S_ATTR_DEBUG,
 258                            SectionKind::getMetadata(), "debug_macinfo");
 259   DwarfDebugInlineSection =
 260       Ctx->getMachOSection("__DWARF", "__debug_inlined", MachO::S_ATTR_DEBUG,
 261                            SectionKind::getMetadata());
 262   DwarfCUIndexSection =
 263       Ctx->getMachOSection("__DWARF", "__debug_cu_index", MachO::S_ATTR_DEBUG,
 264                            SectionKind::getMetadata());
 265   DwarfTUIndexSection =
 266       Ctx->getMachOSection("__DWARF", "__debug_tu_index", MachO::S_ATTR_DEBUG,
 267                            SectionKind::getMetadata());
 268   StackMapSection = Ctx->getMachOSection("__LLVM_STACKMAPS", "__llvm_stackmaps",
 269                                          0, SectionKind::getMetadata());
 270
 271   FaultMapSection = Ctx->getMachOSection("__LLVM_FAULTMAPS", "__llvm_faultmaps",
 272                                          0, SectionKind::getMetadata());
 273
 274   TLSExtraDataSection = TLSTLVSection;
 275 }
 276
 277 void MCObjectFileInfo::initELFMCObjectFileInfo(const Triple &T) {
 278   switch (T.getArch()) {
 279   case Triple::mips:
 280   case Triple::mipsel:
 281     FDECFIEncoding = dwarf::DW_EH_PE_sdata4;
 282     break;
 283   case Triple::mips64:
 284   case Triple::mips64el:
 285     FDECFIEncoding = dwarf::DW_EH_PE_sdata8;
 286     break;
 287   case Triple::x86_64:
 288     FDECFIEncoding = dwarf::DW_EH_PE_pcrel |
 289                      ((CMModel == CodeModel::Large) ? dwarf::DW_EH_PE_sdata8
 290                                                     : dwarf::DW_EH_PE_sdata4);
 291     break;
 292   case Triple::bpfel:
 293   case Triple::bpfeb:
 294     FDECFIEncoding = dwarf::DW_EH_PE_sdata8;
 295     break;
 296   default:
 297     FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 298     break;
 299   }
 300
 301   switch (T.getArch()) {
 302   case Triple::arm:
 303   case Triple::armeb:
 304   case Triple::thumb:
 305   case Triple::thumbeb:
 306     if (Ctx->getAsmInfo()->getExceptionHandlingType() == ExceptionHandling::ARM)
 307       break;
 308     // Fallthrough if not using EHABI
 309     LLVM_FALLTHROUGH;
 310   case Triple::ppc:
 311   case Triple::x86:
 312     PersonalityEncoding = PositionIndependent
 313                               ? dwarf::DW_EH_PE_indirect |
 314                                     dwarf::DW_EH_PE_pcrel |
 315                                     dwarf::DW_EH_PE_sdata4
 316                               : dwarf::DW_EH_PE_absptr;
 317     LSDAEncoding = PositionIndependent
 318                        ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
 319                        : dwarf::DW_EH_PE_absptr;
 320     TTypeEncoding = PositionIndependent
 321                         ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 322                               dwarf::DW_EH_PE_sdata4
 323                         : dwarf::DW_EH_PE_absptr;
 324     break;
 325   case Triple::x86_64:
 326     if (PositionIndependent) {
 327       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 328         ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
 329          ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
 330       LSDAEncoding = dwarf::DW_EH_PE_pcrel |
 331         (CMModel == CodeModel::Small
 332          ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
 333       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 334         ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
 335          ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
 336     } else {
 337       PersonalityEncoding =
 338         (CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
 339         ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
 340       LSDAEncoding = (CMModel == CodeModel::Small)
 341         ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
 342       TTypeEncoding = (CMModel == CodeModel::Small)
 343         ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
 344     }
 345     break;
 346   case Triple::hexagon:
 347     PersonalityEncoding = dwarf::DW_EH_PE_absptr;
 348     LSDAEncoding = dwarf::DW_EH_PE_absptr;
 349     FDECFIEncoding = dwarf::DW_EH_PE_absptr;
 350     TTypeEncoding = dwarf::DW_EH_PE_absptr;
 351     if (PositionIndependent) {
 352       PersonalityEncoding |= dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel;
 353       LSDAEncoding |= dwarf::DW_EH_PE_pcrel;
 354       FDECFIEncoding |= dwarf::DW_EH_PE_pcrel;
 355       TTypeEncoding |= dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel;
 356     }
 357     break;
 358   case Triple::aarch64:
 359   case Triple::aarch64_be:
 360     // The small model guarantees static code/data size < 4GB, but not where it
 361     // will be in memory. Most of these could end up >2GB away so even a signed
 362     // pc-relative 32-bit address is insufficient, theoretically.
 363     if (PositionIndependent) {
 364       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 365         dwarf::DW_EH_PE_sdata8;
 366       LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8;
 367       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 368         dwarf::DW_EH_PE_sdata8;
 369     } else {
 370       PersonalityEncoding = dwarf::DW_EH_PE_absptr;
 371       LSDAEncoding = dwarf::DW_EH_PE_absptr;
 372       TTypeEncoding = dwarf::DW_EH_PE_absptr;
 373     }
 374     break;
 375   case Triple::lanai:
 376     LSDAEncoding = dwarf::DW_EH_PE_absptr;
 377     PersonalityEncoding = dwarf::DW_EH_PE_absptr;
 378     TTypeEncoding = dwarf::DW_EH_PE_absptr;
 379     break;
 380   case Triple::mips:
 381   case Triple::mipsel:
 382   case Triple::mips64:
 383   case Triple::mips64el:
 384     // MIPS uses indirect pointer to refer personality functions and types, so
 385     // that the eh_frame section can be read-only. DW.ref.personality will be
 386     // generated for relocation.
 387     PersonalityEncoding = dwarf::DW_EH_PE_indirect;
 388     // FIXME: The N64 ABI probably ought to use DW_EH_PE_sdata8 but we can't
 389     //        identify N64 from just a triple.
 390     TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 391                     dwarf::DW_EH_PE_sdata4;
 392     // We don't support PC-relative LSDA references in GAS so we use the default
 393     // DW_EH_PE_absptr for those.
 394
 395     // FreeBSD must be explicit about the data size and using pcrel since it's
 396     // assembler/linker won't do the automatic conversion that the Linux tools
 397     // do.
 398     if (T.isOSFreeBSD()) {
 399       PersonalityEncoding |= dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 400       LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 401     }
 402     break;
 403   case Triple::ppc64:
 404   case Triple::ppc64le:
 405     PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 406       dwarf::DW_EH_PE_udata8;
 407     LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
 408     TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 409       dwarf::DW_EH_PE_udata8;
 410     break;
 411   case Triple::sparcel:
 412   case Triple::sparc:
 413     if (PositionIndependent) {
 414       LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 415       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 416         dwarf::DW_EH_PE_sdata4;
 417       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 418         dwarf::DW_EH_PE_sdata4;
 419     } else {
 420       LSDAEncoding = dwarf::DW_EH_PE_absptr;
 421       PersonalityEncoding = dwarf::DW_EH_PE_absptr;
 422       TTypeEncoding = dwarf::DW_EH_PE_absptr;
 423     }
 424     break;
 425   case Triple::sparcv9:
 426     LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 427     if (PositionIndependent) {
 428       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 429         dwarf::DW_EH_PE_sdata4;
 430       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 431         dwarf::DW_EH_PE_sdata4;
 432     } else {
 433       PersonalityEncoding = dwarf::DW_EH_PE_absptr;
 434       TTypeEncoding = dwarf::DW_EH_PE_absptr;
 435     }
 436     break;
 437   case Triple::systemz:
 438     // All currently-defined code models guarantee that 4-byte PC-relative
 439     // values will be in range.
 440     if (PositionIndependent) {
 441       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 442         dwarf::DW_EH_PE_sdata4;
 443       LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 444       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 445         dwarf::DW_EH_PE_sdata4;
 446     } else {
 447       PersonalityEncoding = dwarf::DW_EH_PE_absptr;
 448       LSDAEncoding = dwarf::DW_EH_PE_absptr;
 449       TTypeEncoding = dwarf::DW_EH_PE_absptr;
 450     }
 451     break;
 452   default:
 453     break;
 454   }
 455
 456   unsigned EHSectionType = T.getArch() == Triple::x86_64
 457                                ? ELF::SHT_X86_64_UNWIND
 458                                : ELF::SHT_PROGBITS;
 459
 460   // Solaris requires different flags for .eh_frame to seemingly every other
 461   // platform.
 462   unsigned EHSectionFlags = ELF::SHF_ALLOC;
 463   if (T.isOSSolaris() && T.getArch() != Triple::x86_64)
 464     EHSectionFlags |= ELF::SHF_WRITE;
 465
 466   // ELF
 467   BSSSection = Ctx->getELFSection(".bss", ELF::SHT_NOBITS,
 468                                   ELF::SHF_WRITE | ELF::SHF_ALLOC);
 469
 470   TextSection = Ctx->getELFSection(".text", ELF::SHT_PROGBITS,
 471                                    ELF::SHF_EXECINSTR | ELF::SHF_ALLOC);
 472
 473   DataSection = Ctx->getELFSection(".data", ELF::SHT_PROGBITS,
 474                                    ELF::SHF_WRITE | ELF::SHF_ALLOC);
 475
 476   ReadOnlySection =
 477       Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
 478
 479   TLSDataSection =
 480       Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS,
 481                          ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE);
 482
 483   TLSBSSSection = Ctx->getELFSection(
 484       ".tbss", ELF::SHT_NOBITS, ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE);
 485
 486   DataRelROSection = Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS,
 487                                         ELF::SHF_ALLOC | ELF::SHF_WRITE);
 488
 489   MergeableConst4Section =
 490       Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS,
 491                          ELF::SHF_ALLOC | ELF::SHF_MERGE, 4, "");
 492
 493   MergeableConst8Section =
 494       Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS,
 495                          ELF::SHF_ALLOC | ELF::SHF_MERGE, 8, "");
 496
 497   MergeableConst16Section =
 498       Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS,
 499                          ELF::SHF_ALLOC | ELF::SHF_MERGE, 16, "");
 500
 501   MergeableConst32Section =
 502       Ctx->getELFSection(".rodata.cst32", ELF::SHT_PROGBITS,
 503                          ELF::SHF_ALLOC | ELF::SHF_MERGE, 32, "");
 504
 505   // Exception Handling Sections.
 506
 507   // FIXME: We're emitting LSDA info into a readonly section on ELF, even though
 508   // it contains relocatable pointers.  In PIC mode, this is probably a big
 509   // runtime hit for C++ apps.  Either the contents of the LSDA need to be
 510   // adjusted or this should be a data section.
 511   LSDASection = Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS,
 512                                    ELF::SHF_ALLOC);
 513
 514   COFFDebugSymbolsSection = nullptr;
 515   COFFDebugTypesSection = nullptr;
 516
 517   unsigned DebugSecType = ELF::SHT_PROGBITS;
 518
 519   // MIPS .debug_* sections should have SHT_MIPS_DWARF section type
 520   // to distinguish among sections contain DWARF and ECOFF debug formats.
 521   // Sections with ECOFF debug format are obsoleted and marked by SHT_PROGBITS.
 522   if (T.getArch() == Triple::mips || T.getArch() == Triple::mipsel ||
 523       T.getArch() == Triple::mips64 || T.getArch() == Triple::mips64el)
 524     DebugSecType = ELF::SHT_MIPS_DWARF;
 525
 526   // Debug Info Sections.
 527   DwarfAbbrevSection =
 528       Ctx->getELFSection(".debug_abbrev", DebugSecType, 0);
 529   DwarfInfoSection = Ctx->getELFSection(".debug_info", DebugSecType, 0);
 530   DwarfLineSection = Ctx->getELFSection(".debug_line", DebugSecType, 0);
 531   DwarfFrameSection = Ctx->getELFSection(".debug_frame", DebugSecType, 0);
 532   DwarfPubNamesSection =
 533       Ctx->getELFSection(".debug_pubnames", DebugSecType, 0);
 534   DwarfPubTypesSection =
 535       Ctx->getELFSection(".debug_pubtypes", DebugSecType, 0);
 536   DwarfGnuPubNamesSection =
 537       Ctx->getELFSection(".debug_gnu_pubnames", DebugSecType, 0);
 538   DwarfGnuPubTypesSection =
 539       Ctx->getELFSection(".debug_gnu_pubtypes", DebugSecType, 0);
 540   DwarfStrSection =
 541       Ctx->getELFSection(".debug_str", DebugSecType,
 542                          ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, "");
 543   DwarfLocSection = Ctx->getELFSection(".debug_loc", DebugSecType, 0);
 544   DwarfARangesSection =
 545       Ctx->getELFSection(".debug_aranges", DebugSecType, 0);
 546   DwarfRangesSection =
 547       Ctx->getELFSection(".debug_ranges", DebugSecType, 0);
 548   DwarfMacinfoSection =
 549       Ctx->getELFSection(".debug_macinfo", DebugSecType, 0);
 550
 551   // DWARF5 Experimental Debug Info
 552
 553   // Accelerator Tables
 554   DwarfAccelNamesSection =
 555       Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0);
 556   DwarfAccelObjCSection =
 557       Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0);
 558   DwarfAccelNamespaceSection =
 559       Ctx->getELFSection(".apple_namespaces", ELF::SHT_PROGBITS, 0);
 560   DwarfAccelTypesSection =
 561       Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0);
 562
 563   // String Offset and Address Sections
 564   DwarfStrOffSection =
 565       Ctx->getELFSection(".debug_str_offsets", DebugSecType, 0);
 566   DwarfAddrSection = Ctx->getELFSection(".debug_addr", DebugSecType, 0);
 567
 568   // Fission Sections
 569   DwarfInfoDWOSection =
 570       Ctx->getELFSection(".debug_info.dwo", DebugSecType, 0);
 571   DwarfTypesDWOSection =
 572       Ctx->getELFSection(".debug_types.dwo", DebugSecType, 0);
 573   DwarfAbbrevDWOSection =
 574       Ctx->getELFSection(".debug_abbrev.dwo", DebugSecType, 0);
 575   DwarfStrDWOSection =
 576       Ctx->getELFSection(".debug_str.dwo", DebugSecType,
 577                          ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, "");
 578   DwarfLineDWOSection =
 579       Ctx->getELFSection(".debug_line.dwo", DebugSecType, 0);
 580   DwarfLocDWOSection =
 581       Ctx->getELFSection(".debug_loc.dwo", DebugSecType, 0);
 582   DwarfStrOffDWOSection =
 583       Ctx->getELFSection(".debug_str_offsets.dwo", DebugSecType, 0);
 584
 585   // DWP Sections
 586   DwarfCUIndexSection =
 587       Ctx->getELFSection(".debug_cu_index", DebugSecType, 0);
 588   DwarfTUIndexSection =
 589       Ctx->getELFSection(".debug_tu_index", DebugSecType, 0);
 590
 591   StackMapSection =
 592       Ctx->getELFSection(".llvm_stackmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
 593
 594   FaultMapSection =
 595       Ctx->getELFSection(".llvm_faultmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
 596
 597   EHFrameSection =
 598       Ctx->getELFSection(".eh_frame", EHSectionType, EHSectionFlags);
 599 }
 600
 601 void MCObjectFileInfo::initCOFFMCObjectFileInfo(const Triple &T) {
 602   EHFrameSection = Ctx->getCOFFSection(
 603       ".eh_frame", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 604                        COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
 605       SectionKind::getData());
 606
 607   // Set the `IMAGE_SCN_MEM_16BIT` flag when compiling for thumb mode.  This is
 608   // used to indicate to the linker that the text segment contains thumb instructions
 609   // and to set the ISA selection bit for calls accordingly.
 610   const bool IsThumb = T.getArch() == Triple::thumb;
 611
 612   CommDirectiveSupportsAlignment = true;
 613
 614   // COFF
 615   BSSSection = Ctx->getCOFFSection(
 616       ".bss", COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA |
 617                   COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
 618       SectionKind::getBSS());
 619   TextSection = Ctx->getCOFFSection(
 620       ".text",
 621       (IsThumb ? COFF::IMAGE_SCN_MEM_16BIT : (COFF::SectionCharacteristics)0) |
 622           COFF::IMAGE_SCN_CNT_CODE | COFF::IMAGE_SCN_MEM_EXECUTE |
 623           COFF::IMAGE_SCN_MEM_READ,
 624       SectionKind::getText());
 625   DataSection = Ctx->getCOFFSection(
 626       ".data", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ |
 627                    COFF::IMAGE_SCN_MEM_WRITE,
 628       SectionKind::getData());
 629   ReadOnlySection = Ctx->getCOFFSection(
 630       ".rdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
 631       SectionKind::getReadOnly());
 632
 633   // FIXME: We're emitting LSDA info into a readonly section on COFF, even
 634   // though it contains relocatable pointers.  In PIC mode, this is probably a
 635   // big runtime hit for C++ apps.  Either the contents of the LSDA need to be
 636   // adjusted or this should be a data section.
 637   if (T.getArch() == Triple::x86_64) {
 638     // On Windows 64 with SEH, the LSDA is emitted into the .xdata section
 639     LSDASection = nullptr;
 640   } else {
 641     LSDASection = Ctx->getCOFFSection(".gcc_except_table",
 642                                       COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 643                                           COFF::IMAGE_SCN_MEM_READ,
 644                                       SectionKind::getReadOnly());
 645   }
 646
 647   // Debug info.
 648   COFFDebugSymbolsSection =
 649       Ctx->getCOFFSection(".debug$S", (COFF::IMAGE_SCN_MEM_DISCARDABLE |
 650                                        COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 651                                        COFF::IMAGE_SCN_MEM_READ),
 652                           SectionKind::getMetadata());
 653   COFFDebugTypesSection =
 654       Ctx->getCOFFSection(".debug$T", (COFF::IMAGE_SCN_MEM_DISCARDABLE |
 655                                        COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 656                                        COFF::IMAGE_SCN_MEM_READ),
 657                           SectionKind::getMetadata());
 658
 659   DwarfAbbrevSection = Ctx->getCOFFSection(
 660       ".debug_abbrev",
 661       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 662           COFF::IMAGE_SCN_MEM_READ,
 663       SectionKind::getMetadata(), "section_abbrev");
 664   DwarfInfoSection = Ctx->getCOFFSection(
 665       ".debug_info",
 666       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 667           COFF::IMAGE_SCN_MEM_READ,
 668       SectionKind::getMetadata(), "section_info");
 669   DwarfLineSection = Ctx->getCOFFSection(
 670       ".debug_line",
 671       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 672           COFF::IMAGE_SCN_MEM_READ,
 673       SectionKind::getMetadata(), "section_line");
 674
 675   DwarfFrameSection = Ctx->getCOFFSection(
 676       ".debug_frame",
 677       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 678           COFF::IMAGE_SCN_MEM_READ,
 679       SectionKind::getMetadata());
 680   DwarfPubNamesSection = Ctx->getCOFFSection(
 681       ".debug_pubnames",
 682       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 683           COFF::IMAGE_SCN_MEM_READ,
 684       SectionKind::getMetadata());
 685   DwarfPubTypesSection = Ctx->getCOFFSection(
 686       ".debug_pubtypes",
 687       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 688           COFF::IMAGE_SCN_MEM_READ,
 689       SectionKind::getMetadata());
 690   DwarfGnuPubNamesSection = Ctx->getCOFFSection(
 691       ".debug_gnu_pubnames",
 692       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 693           COFF::IMAGE_SCN_MEM_READ,
 694       SectionKind::getMetadata());
 695   DwarfGnuPubTypesSection = Ctx->getCOFFSection(
 696       ".debug_gnu_pubtypes",
 697       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 698           COFF::IMAGE_SCN_MEM_READ,
 699       SectionKind::getMetadata());
 700   DwarfStrSection = Ctx->getCOFFSection(
 701       ".debug_str",
 702       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 703           COFF::IMAGE_SCN_MEM_READ,
 704       SectionKind::getMetadata(), "info_string");
 705   DwarfStrOffSection = Ctx->getCOFFSection(
 706       ".debug_str_offsets",
 707       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 708           COFF::IMAGE_SCN_MEM_READ,
 709       SectionKind::getMetadata(), "section_str_off");
 710   DwarfLocSection = Ctx->getCOFFSection(
 711       ".debug_loc",
 712       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 713           COFF::IMAGE_SCN_MEM_READ,
 714       SectionKind::getMetadata(), "section_debug_loc");
 715   DwarfARangesSection = Ctx->getCOFFSection(
 716       ".debug_aranges",
 717       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 718           COFF::IMAGE_SCN_MEM_READ,
 719       SectionKind::getMetadata());
 720   DwarfRangesSection = Ctx->getCOFFSection(
 721       ".debug_ranges",
 722       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 723           COFF::IMAGE_SCN_MEM_READ,
 724       SectionKind::getMetadata(), "debug_range");
 725   DwarfMacinfoSection = Ctx->getCOFFSection(
 726       ".debug_macinfo",
 727       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 728           COFF::IMAGE_SCN_MEM_READ,
 729       SectionKind::getMetadata(), "debug_macinfo");
 730   DwarfInfoDWOSection = Ctx->getCOFFSection(
 731       ".debug_info.dwo",
 732       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 733           COFF::IMAGE_SCN_MEM_READ,
 734       SectionKind::getMetadata(), "section_info_dwo");
 735   DwarfTypesDWOSection = Ctx->getCOFFSection(
 736       ".debug_types.dwo",
 737       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 738           COFF::IMAGE_SCN_MEM_READ,
 739       SectionKind::getMetadata(), "section_types_dwo");
 740   DwarfAbbrevDWOSection = Ctx->getCOFFSection(
 741       ".debug_abbrev.dwo",
 742       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 743           COFF::IMAGE_SCN_MEM_READ,
 744       SectionKind::getMetadata(), "section_abbrev_dwo");
 745   DwarfStrDWOSection = Ctx->getCOFFSection(
 746       ".debug_str.dwo",
 747       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 748           COFF::IMAGE_SCN_MEM_READ,
 749       SectionKind::getMetadata(), "skel_string");
 750   DwarfLineDWOSection = Ctx->getCOFFSection(
 751       ".debug_line.dwo",
 752       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 753           COFF::IMAGE_SCN_MEM_READ,
 754       SectionKind::getMetadata());
 755   DwarfLocDWOSection = Ctx->getCOFFSection(
 756       ".debug_loc.dwo",
 757       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 758           COFF::IMAGE_SCN_MEM_READ,
 759       SectionKind::getMetadata(), "skel_loc");
 760   DwarfStrOffDWOSection = Ctx->getCOFFSection(
 761       ".debug_str_offsets.dwo",
 762       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 763           COFF::IMAGE_SCN_MEM_READ,
 764       SectionKind::getMetadata(), "section_str_off_dwo");
 765   DwarfAddrSection = Ctx->getCOFFSection(
 766       ".debug_addr",
 767       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 768           COFF::IMAGE_SCN_MEM_READ,
 769       SectionKind::getMetadata(), "addr_sec");
 770   DwarfCUIndexSection = Ctx->getCOFFSection(
 771       ".debug_cu_index",
 772       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 773           COFF::IMAGE_SCN_MEM_READ,
 774       SectionKind::getMetadata());
 775   DwarfTUIndexSection = Ctx->getCOFFSection(
 776       ".debug_tu_index",
 777       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 778           COFF::IMAGE_SCN_MEM_READ,
 779       SectionKind::getMetadata());
 780   DwarfAccelNamesSection = Ctx->getCOFFSection(
 781       ".apple_names",
 782       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 783           COFF::IMAGE_SCN_MEM_READ,
 784       SectionKind::getMetadata(), "names_begin");
 785   DwarfAccelNamespaceSection = Ctx->getCOFFSection(
 786       ".apple_namespaces",
 787       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 788           COFF::IMAGE_SCN_MEM_READ,
 789       SectionKind::getMetadata(), "namespac_begin");
 790   DwarfAccelTypesSection = Ctx->getCOFFSection(
 791       ".apple_types",
 792       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 793           COFF::IMAGE_SCN_MEM_READ,
 794       SectionKind::getMetadata(), "types_begin");
 795   DwarfAccelObjCSection = Ctx->getCOFFSection(
 796       ".apple_objc",
 797       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 798           COFF::IMAGE_SCN_MEM_READ,
 799       SectionKind::getMetadata(), "objc_begin");
 800
 801   DrectveSection = Ctx->getCOFFSection(
 802       ".drectve", COFF::IMAGE_SCN_LNK_INFO | COFF::IMAGE_SCN_LNK_REMOVE,
 803       SectionKind::getMetadata());
 804
 805   PDataSection = Ctx->getCOFFSection(
 806       ".pdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
 807       SectionKind::getData());
 808
 809   XDataSection = Ctx->getCOFFSection(
 810       ".xdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
 811       SectionKind::getData());
 812
 813   SXDataSection = Ctx->getCOFFSection(".sxdata", COFF::IMAGE_SCN_LNK_INFO,
 814                                       SectionKind::getMetadata());
 815
 816   TLSDataSection = Ctx->getCOFFSection(
 817       ".tls$", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ |
 818                    COFF::IMAGE_SCN_MEM_WRITE,
 819       SectionKind::getData());
 820
 821   StackMapSection = Ctx->getCOFFSection(".llvm_stackmaps",
 822                                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 823                                             COFF::IMAGE_SCN_MEM_READ,
 824                                         SectionKind::getReadOnly());
 825 }
 826
 827 void MCObjectFileInfo::initWasmMCObjectFileInfo(const Triple &T) {
 828   // TODO: Set the section types and flags.
 829   TextSection = Ctx->getWasmSection(".text", 0, 0);
 830   DataSection = Ctx->getWasmSection(".data", 0, 0);
 831
 832   // TODO: Set the section types and flags.
 833   DwarfLineSection = Ctx->getWasmSection(".debug_line", 0, 0);
 834   DwarfStrSection = Ctx->getWasmSection(".debug_str", 0, 0);
 835   DwarfLocSection = Ctx->getWasmSection(".debug_loc", 0, 0);
 836   DwarfAbbrevSection = Ctx->getWasmSection(".debug_abbrev", 0, 0, "section_abbrev");
 837   DwarfARangesSection = Ctx->getWasmSection(".debug_aranges", 0, 0);
 838   DwarfRangesSection = Ctx->getWasmSection(".debug_ranges", 0, 0, "debug_range");
 839   DwarfMacinfoSection = Ctx->getWasmSection(".debug_macinfo", 0, 0, "debug_macinfo");
 840   DwarfAddrSection = Ctx->getWasmSection(".debug_addr", 0, 0);
 841   DwarfCUIndexSection = Ctx->getWasmSection(".debug_cu_index", 0, 0);
 842   DwarfTUIndexSection = Ctx->getWasmSection(".debug_tu_index", 0, 0);
 843   DwarfInfoSection = Ctx->getWasmSection(".debug_info", 0, 0, "section_info");
 844   DwarfFrameSection = Ctx->getWasmSection(".debug_frame", 0, 0);
 845   DwarfPubNamesSection = Ctx->getWasmSection(".debug_pubnames", 0, 0);
 846   DwarfPubTypesSection = Ctx->getWasmSection(".debug_pubtypes", 0, 0);
 847
 848   // TODO: Define more sections.
 849 }
 850
 851 void MCObjectFileInfo::InitMCObjectFileInfo(const Triple &TheTriple, bool PIC,
 852                                             CodeModel::Model cm,
 853                                             MCContext &ctx) {
 854   PositionIndependent = PIC;
 855   CMModel = cm;
 856   Ctx = &ctx;
 857
 858   // Common.
 859   CommDirectiveSupportsAlignment = true;
 860   SupportsWeakOmittedEHFrame = true;
 861   SupportsCompactUnwindWithoutEHFrame = false;
 862   OmitDwarfIfHaveCompactUnwind = false;
 863
 864   PersonalityEncoding = LSDAEncoding = FDECFIEncoding = TTypeEncoding =
 865       dwarf::DW_EH_PE_absptr;
 866
 867   CompactUnwindDwarfEHFrameOnly = 0;
 868
 869   EHFrameSection = nullptr;             // Created on demand.
 870   CompactUnwindSection = nullptr;       // Used only by selected targets.
 871   DwarfAccelNamesSection = nullptr;     // Used only by selected targets.
 872   DwarfAccelObjCSection = nullptr;      // Used only by selected targets.
 873   DwarfAccelNamespaceSection = nullptr; // Used only by selected targets.
 874   DwarfAccelTypesSection = nullptr;     // Used only by selected targets.
 875
 876   TT = TheTriple;
 877
 878   switch (TT.getObjectFormat()) {
 879   case Triple::MachO:
 880     Env = IsMachO;
 881     initMachOMCObjectFileInfo(TT);
 882     break;
 883   case Triple::COFF:
 884     if (!TT.isOSWindows())
 885       report_fatal_error(
 886           "Cannot initialize MC for non-Windows COFF object files.");
 887
 888     Env = IsCOFF;
 889     initCOFFMCObjectFileInfo(TT);
 890     break;
 891   case Triple::ELF:
 892     Env = IsELF;
 893     initELFMCObjectFileInfo(TT);
 894     break;
 895   case Triple::Wasm:
 896     Env = IsWasm;
 897     initWasmMCObjectFileInfo(TT);
 898     break;
 899   case Triple::UnknownObjectFormat:
 900     report_fatal_error("Cannot initialize MC for unknown object file format.");
 901     break;
 902   }
 903 }
 904
 905 MCSection *MCObjectFileInfo::getDwarfTypesSection(uint64_t Hash) const {
 906   return Ctx->getELFSection(".debug_types", ELF::SHT_PROGBITS, ELF::SHF_GROUP,
 907                             0, utostr(Hash));
 908 }