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   ConstDataSection  // .const_data
 139     = Ctx->getMachOSection("__DATA", "__const", 0,
 140                            SectionKind::getReadOnlyWithRel());
 141
 142   if (ArchTy == Triple::ppc || ArchTy == Triple::ppc64) {
 143     TextCoalSection
 144       = Ctx->getMachOSection("__TEXT", "__textcoal_nt",
 145                              MachO::S_COALESCED |
 146                              MachO::S_ATTR_PURE_INSTRUCTIONS,
 147                              SectionKind::getText());
 148     ConstTextCoalSection
 149       = Ctx->getMachOSection("__TEXT", "__const_coal",
 150                              MachO::S_COALESCED,
 151                              SectionKind::getReadOnly());
 152     DataCoalSection = Ctx->getMachOSection(
 153         "__DATA", "__datacoal_nt", MachO::S_COALESCED, SectionKind::getData());
 154     ConstDataCoalSection = DataCoalSection;
 155   } else {
 156     TextCoalSection = TextSection;
 157     ConstTextCoalSection = ReadOnlySection;
 158     DataCoalSection = DataSection;
 159     ConstDataCoalSection = ConstDataSection;
 160   }
 161
 162   DataCommonSection
 163     = Ctx->getMachOSection("__DATA","__common",
 164                            MachO::S_ZEROFILL,
 165                            SectionKind::getBSS());
 166   DataBSSSection
 167     = Ctx->getMachOSection("__DATA","__bss", MachO::S_ZEROFILL,
 168                            SectionKind::getBSS());
 169
 170
 171   LazySymbolPointerSection
 172     = Ctx->getMachOSection("__DATA", "__la_symbol_ptr",
 173                            MachO::S_LAZY_SYMBOL_POINTERS,
 174                            SectionKind::getMetadata());
 175   NonLazySymbolPointerSection
 176     = Ctx->getMachOSection("__DATA", "__nl_symbol_ptr",
 177                            MachO::S_NON_LAZY_SYMBOL_POINTERS,
 178                            SectionKind::getMetadata());
 179
 180   ThreadLocalPointerSection
 181     = Ctx->getMachOSection("__DATA", "__thread_ptr",
 182                            MachO::S_THREAD_LOCAL_VARIABLE_POINTERS,
 183                            SectionKind::getMetadata());
 184
 185   // Exception Handling.
 186   LSDASection = Ctx->getMachOSection("__TEXT", "__gcc_except_tab", 0,
 187                                      SectionKind::getReadOnlyWithRel());
 188
 189   COFFDebugSymbolsSection = nullptr;
 190   COFFDebugTypesSection = nullptr;
 191   COFFGlobalTypeHashesSection = nullptr;
 192
 193   if (useCompactUnwind(T)) {
 194     CompactUnwindSection =
 195         Ctx->getMachOSection("__LD", "__compact_unwind", MachO::S_ATTR_DEBUG,
 196                              SectionKind::getReadOnly());
 197
 198     if (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86)
 199       CompactUnwindDwarfEHFrameOnly = 0x04000000;  // UNWIND_X86_64_MODE_DWARF
 200     else if (T.getArch() == Triple::aarch64)
 201       CompactUnwindDwarfEHFrameOnly = 0x03000000;  // UNWIND_ARM64_MODE_DWARF
 202     else if (T.getArch() == Triple::arm || T.getArch() == Triple::thumb)
 203       CompactUnwindDwarfEHFrameOnly = 0x04000000;  // UNWIND_ARM_MODE_DWARF
 204   }
 205
 206   // Debug Information.
 207   DwarfDebugNamesSection =
 208       Ctx->getMachOSection("__DWARF", "__debug_names", MachO::S_ATTR_DEBUG,
 209                            SectionKind::getMetadata(), "debug_names_begin");
 210   DwarfAccelNamesSection =
 211       Ctx->getMachOSection("__DWARF", "__apple_names", MachO::S_ATTR_DEBUG,
 212                            SectionKind::getMetadata(), "names_begin");
 213   DwarfAccelObjCSection =
 214       Ctx->getMachOSection("__DWARF", "__apple_objc", MachO::S_ATTR_DEBUG,
 215                            SectionKind::getMetadata(), "objc_begin");
 216   // 16 character section limit...
 217   DwarfAccelNamespaceSection =
 218       Ctx->getMachOSection("__DWARF", "__apple_namespac", MachO::S_ATTR_DEBUG,
 219                            SectionKind::getMetadata(), "namespac_begin");
 220   DwarfAccelTypesSection =
 221       Ctx->getMachOSection("__DWARF", "__apple_types", MachO::S_ATTR_DEBUG,
 222                            SectionKind::getMetadata(), "types_begin");
 223
 224   DwarfSwiftASTSection =
 225       Ctx->getMachOSection("__DWARF", "__swift_ast", MachO::S_ATTR_DEBUG,
 226                            SectionKind::getMetadata());
 227
 228   DwarfAbbrevSection =
 229       Ctx->getMachOSection("__DWARF", "__debug_abbrev", MachO::S_ATTR_DEBUG,
 230                            SectionKind::getMetadata(), "section_abbrev");
 231   DwarfInfoSection =
 232       Ctx->getMachOSection("__DWARF", "__debug_info", MachO::S_ATTR_DEBUG,
 233                            SectionKind::getMetadata(), "section_info");
 234   DwarfLineSection =
 235       Ctx->getMachOSection("__DWARF", "__debug_line", MachO::S_ATTR_DEBUG,
 236                            SectionKind::getMetadata(), "section_line");
 237   DwarfLineStrSection =
 238       Ctx->getMachOSection("__DWARF", "__debug_line_str", MachO::S_ATTR_DEBUG,
 239                            SectionKind::getMetadata(), "section_line_str");
 240   DwarfFrameSection =
 241       Ctx->getMachOSection("__DWARF", "__debug_frame", MachO::S_ATTR_DEBUG,
 242                            SectionKind::getMetadata());
 243   DwarfPubNamesSection =
 244       Ctx->getMachOSection("__DWARF", "__debug_pubnames", MachO::S_ATTR_DEBUG,
 245                            SectionKind::getMetadata());
 246   DwarfPubTypesSection =
 247       Ctx->getMachOSection("__DWARF", "__debug_pubtypes", MachO::S_ATTR_DEBUG,
 248                            SectionKind::getMetadata());
 249   DwarfGnuPubNamesSection =
 250       Ctx->getMachOSection("__DWARF", "__debug_gnu_pubn", MachO::S_ATTR_DEBUG,
 251                            SectionKind::getMetadata());
 252   DwarfGnuPubTypesSection =
 253       Ctx->getMachOSection("__DWARF", "__debug_gnu_pubt", MachO::S_ATTR_DEBUG,
 254                            SectionKind::getMetadata());
 255   DwarfStrSection =
 256       Ctx->getMachOSection("__DWARF", "__debug_str", MachO::S_ATTR_DEBUG,
 257                            SectionKind::getMetadata(), "info_string");
 258   DwarfStrOffSection =
 259       Ctx->getMachOSection("__DWARF", "__debug_str_offs", MachO::S_ATTR_DEBUG,
 260                            SectionKind::getMetadata(), "section_str_off");
 261   DwarfLocSection =
 262       Ctx->getMachOSection("__DWARF", "__debug_loc", MachO::S_ATTR_DEBUG,
 263                            SectionKind::getMetadata(), "section_debug_loc");
 264   DwarfARangesSection =
 265       Ctx->getMachOSection("__DWARF", "__debug_aranges", MachO::S_ATTR_DEBUG,
 266                            SectionKind::getMetadata());
 267   DwarfRangesSection =
 268       Ctx->getMachOSection("__DWARF", "__debug_ranges", MachO::S_ATTR_DEBUG,
 269                            SectionKind::getMetadata(), "debug_range");
 270   DwarfRnglistsSection =
 271       Ctx->getMachOSection("__DWARF", "__debug_rnglists", MachO::S_ATTR_DEBUG,
 272                            SectionKind::getMetadata(), "debug_range");
 273   DwarfMacinfoSection =
 274       Ctx->getMachOSection("__DWARF", "__debug_macinfo", MachO::S_ATTR_DEBUG,
 275                            SectionKind::getMetadata(), "debug_macinfo");
 276   DwarfDebugInlineSection =
 277       Ctx->getMachOSection("__DWARF", "__debug_inlined", MachO::S_ATTR_DEBUG,
 278                            SectionKind::getMetadata());
 279   DwarfCUIndexSection =
 280       Ctx->getMachOSection("__DWARF", "__debug_cu_index", MachO::S_ATTR_DEBUG,
 281                            SectionKind::getMetadata());
 282   DwarfTUIndexSection =
 283       Ctx->getMachOSection("__DWARF", "__debug_tu_index", MachO::S_ATTR_DEBUG,
 284                            SectionKind::getMetadata());
 285   StackMapSection = Ctx->getMachOSection("__LLVM_STACKMAPS", "__llvm_stackmaps",
 286                                          0, SectionKind::getMetadata());
 287
 288   FaultMapSection = Ctx->getMachOSection("__LLVM_FAULTMAPS", "__llvm_faultmaps",
 289                                          0, SectionKind::getMetadata());
 290
 291   TLSExtraDataSection = TLSTLVSection;
 292 }
 293
 294 void MCObjectFileInfo::initELFMCObjectFileInfo(const Triple &T, bool Large) {
 295   switch (T.getArch()) {
 296   case Triple::mips:
 297   case Triple::mipsel:
 298     FDECFIEncoding = dwarf::DW_EH_PE_sdata4;
 299     break;
 300   case Triple::mips64:
 301   case Triple::mips64el:
 302     FDECFIEncoding = dwarf::DW_EH_PE_sdata8;
 303     break;
 304   case Triple::ppc64:
 305   case Triple::ppc64le:
 306   case Triple::x86_64:
 307     FDECFIEncoding = dwarf::DW_EH_PE_pcrel |
 308                      (Large ? dwarf::DW_EH_PE_sdata8 : dwarf::DW_EH_PE_sdata4);
 309     break;
 310   case Triple::bpfel:
 311   case Triple::bpfeb:
 312     FDECFIEncoding = dwarf::DW_EH_PE_sdata8;
 313     break;
 314   default:
 315     FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 316     break;
 317   }
 318
 319   switch (T.getArch()) {
 320   case Triple::arm:
 321   case Triple::armeb:
 322   case Triple::thumb:
 323   case Triple::thumbeb:
 324     if (Ctx->getAsmInfo()->getExceptionHandlingType() == ExceptionHandling::ARM)
 325       break;
 326     // Fallthrough if not using EHABI
 327     LLVM_FALLTHROUGH;
 328   case Triple::ppc:
 329   case Triple::x86:
 330     PersonalityEncoding = PositionIndependent
 331                               ? dwarf::DW_EH_PE_indirect |
 332                                     dwarf::DW_EH_PE_pcrel |
 333                                     dwarf::DW_EH_PE_sdata4
 334                               : dwarf::DW_EH_PE_absptr;
 335     LSDAEncoding = PositionIndependent
 336                        ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
 337                        : dwarf::DW_EH_PE_absptr;
 338     TTypeEncoding = PositionIndependent
 339                         ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 340                               dwarf::DW_EH_PE_sdata4
 341                         : dwarf::DW_EH_PE_absptr;
 342     break;
 343   case Triple::x86_64:
 344     if (PositionIndependent) {
 345       PersonalityEncoding =
 346           dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 347           (Large ? dwarf::DW_EH_PE_sdata8 : dwarf::DW_EH_PE_sdata4);
 348       LSDAEncoding = dwarf::DW_EH_PE_pcrel |
 349                      (Large ? dwarf::DW_EH_PE_sdata8 : dwarf::DW_EH_PE_sdata4);
 350       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 351                       (Large ? dwarf::DW_EH_PE_sdata8 : dwarf::DW_EH_PE_sdata4);
 352     } else {
 353       PersonalityEncoding =
 354           Large ? dwarf::DW_EH_PE_absptr : dwarf::DW_EH_PE_udata4;
 355       LSDAEncoding = Large ? dwarf::DW_EH_PE_absptr : dwarf::DW_EH_PE_udata4;
 356       TTypeEncoding = Large ? dwarf::DW_EH_PE_absptr : dwarf::DW_EH_PE_udata4;
 357     }
 358     break;
 359   case Triple::hexagon:
 360     PersonalityEncoding = dwarf::DW_EH_PE_absptr;
 361     LSDAEncoding = dwarf::DW_EH_PE_absptr;
 362     FDECFIEncoding = dwarf::DW_EH_PE_absptr;
 363     TTypeEncoding = dwarf::DW_EH_PE_absptr;
 364     if (PositionIndependent) {
 365       PersonalityEncoding |= dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel;
 366       LSDAEncoding |= dwarf::DW_EH_PE_pcrel;
 367       FDECFIEncoding |= dwarf::DW_EH_PE_pcrel;
 368       TTypeEncoding |= dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel;
 369     }
 370     break;
 371   case Triple::aarch64:
 372   case Triple::aarch64_be:
 373     // The small model guarantees static code/data size < 4GB, but not where it
 374     // will be in memory. Most of these could end up >2GB away so even a signed
 375     // pc-relative 32-bit address is insufficient, theoretically.
 376     if (PositionIndependent) {
 377       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 378         dwarf::DW_EH_PE_sdata8;
 379       LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8;
 380       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 381         dwarf::DW_EH_PE_sdata8;
 382     } else {
 383       PersonalityEncoding = dwarf::DW_EH_PE_absptr;
 384       LSDAEncoding = dwarf::DW_EH_PE_absptr;
 385       TTypeEncoding = dwarf::DW_EH_PE_absptr;
 386     }
 387     break;
 388   case Triple::lanai:
 389     LSDAEncoding = dwarf::DW_EH_PE_absptr;
 390     PersonalityEncoding = dwarf::DW_EH_PE_absptr;
 391     TTypeEncoding = dwarf::DW_EH_PE_absptr;
 392     break;
 393   case Triple::mips:
 394   case Triple::mipsel:
 395   case Triple::mips64:
 396   case Triple::mips64el:
 397     // MIPS uses indirect pointer to refer personality functions and types, so
 398     // that the eh_frame section can be read-only. DW.ref.personality will be
 399     // generated for relocation.
 400     PersonalityEncoding = dwarf::DW_EH_PE_indirect;
 401     // FIXME: The N64 ABI probably ought to use DW_EH_PE_sdata8 but we can't
 402     //        identify N64 from just a triple.
 403     TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 404                     dwarf::DW_EH_PE_sdata4;
 405     // We don't support PC-relative LSDA references in GAS so we use the default
 406     // DW_EH_PE_absptr for those.
 407
 408     // FreeBSD must be explicit about the data size and using pcrel since it's
 409     // assembler/linker won't do the automatic conversion that the Linux tools
 410     // do.
 411     if (T.isOSFreeBSD()) {
 412       PersonalityEncoding |= dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 413       LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 414     }
 415     break;
 416   case Triple::ppc64:
 417   case Triple::ppc64le:
 418     PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 419       dwarf::DW_EH_PE_udata8;
 420     LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
 421     TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 422       dwarf::DW_EH_PE_udata8;
 423     break;
 424   case Triple::sparcel:
 425   case Triple::sparc:
 426     if (PositionIndependent) {
 427       LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 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       LSDAEncoding = dwarf::DW_EH_PE_absptr;
 434       PersonalityEncoding = dwarf::DW_EH_PE_absptr;
 435       TTypeEncoding = dwarf::DW_EH_PE_absptr;
 436     }
 437     break;
 438   case Triple::sparcv9:
 439     LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 440     if (PositionIndependent) {
 441       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 442         dwarf::DW_EH_PE_sdata4;
 443       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 444         dwarf::DW_EH_PE_sdata4;
 445     } else {
 446       PersonalityEncoding = dwarf::DW_EH_PE_absptr;
 447       TTypeEncoding = dwarf::DW_EH_PE_absptr;
 448     }
 449     break;
 450   case Triple::systemz:
 451     // All currently-defined code models guarantee that 4-byte PC-relative
 452     // values will be in range.
 453     if (PositionIndependent) {
 454       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 455         dwarf::DW_EH_PE_sdata4;
 456       LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 457       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 458         dwarf::DW_EH_PE_sdata4;
 459     } else {
 460       PersonalityEncoding = dwarf::DW_EH_PE_absptr;
 461       LSDAEncoding = dwarf::DW_EH_PE_absptr;
 462       TTypeEncoding = dwarf::DW_EH_PE_absptr;
 463     }
 464     break;
 465   default:
 466     break;
 467   }
 468
 469   unsigned EHSectionType = T.getArch() == Triple::x86_64
 470                                ? ELF::SHT_X86_64_UNWIND
 471                                : ELF::SHT_PROGBITS;
 472
 473   // Solaris requires different flags for .eh_frame to seemingly every other
 474   // platform.
 475   unsigned EHSectionFlags = ELF::SHF_ALLOC;
 476   if (T.isOSSolaris() && T.getArch() != Triple::x86_64)
 477     EHSectionFlags |= ELF::SHF_WRITE;
 478
 479   // ELF
 480   BSSSection = Ctx->getELFSection(".bss", ELF::SHT_NOBITS,
 481                                   ELF::SHF_WRITE | ELF::SHF_ALLOC);
 482
 483   TextSection = Ctx->getELFSection(".text", ELF::SHT_PROGBITS,
 484                                    ELF::SHF_EXECINSTR | ELF::SHF_ALLOC);
 485
 486   DataSection = Ctx->getELFSection(".data", ELF::SHT_PROGBITS,
 487                                    ELF::SHF_WRITE | ELF::SHF_ALLOC);
 488
 489   ReadOnlySection =
 490       Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
 491
 492   TLSDataSection =
 493       Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS,
 494                          ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE);
 495
 496   TLSBSSSection = Ctx->getELFSection(
 497       ".tbss", ELF::SHT_NOBITS, ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE);
 498
 499   DataRelROSection = Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS,
 500                                         ELF::SHF_ALLOC | ELF::SHF_WRITE);
 501
 502   MergeableConst4Section =
 503       Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS,
 504                          ELF::SHF_ALLOC | ELF::SHF_MERGE, 4, "");
 505
 506   MergeableConst8Section =
 507       Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS,
 508                          ELF::SHF_ALLOC | ELF::SHF_MERGE, 8, "");
 509
 510   MergeableConst16Section =
 511       Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS,
 512                          ELF::SHF_ALLOC | ELF::SHF_MERGE, 16, "");
 513
 514   MergeableConst32Section =
 515       Ctx->getELFSection(".rodata.cst32", ELF::SHT_PROGBITS,
 516                          ELF::SHF_ALLOC | ELF::SHF_MERGE, 32, "");
 517
 518   // Exception Handling Sections.
 519
 520   // FIXME: We're emitting LSDA info into a readonly section on ELF, even though
 521   // it contains relocatable pointers.  In PIC mode, this is probably a big
 522   // runtime hit for C++ apps.  Either the contents of the LSDA need to be
 523   // adjusted or this should be a data section.
 524   LSDASection = Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS,
 525                                    ELF::SHF_ALLOC);
 526
 527   COFFDebugSymbolsSection = nullptr;
 528   COFFDebugTypesSection = nullptr;
 529
 530   unsigned DebugSecType = ELF::SHT_PROGBITS;
 531
 532   // MIPS .debug_* sections should have SHT_MIPS_DWARF section type
 533   // to distinguish among sections contain DWARF and ECOFF debug formats.
 534   // Sections with ECOFF debug format are obsoleted and marked by SHT_PROGBITS.
 535   if (T.isMIPS())
 536     DebugSecType = ELF::SHT_MIPS_DWARF;
 537
 538   // Debug Info Sections.
 539   DwarfAbbrevSection =
 540       Ctx->getELFSection(".debug_abbrev", DebugSecType, 0);
 541   DwarfInfoSection = Ctx->getELFSection(".debug_info", DebugSecType, 0);
 542   DwarfLineSection = Ctx->getELFSection(".debug_line", DebugSecType, 0);
 543   DwarfLineStrSection =
 544       Ctx->getELFSection(".debug_line_str", DebugSecType,
 545                          ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, "");
 546   DwarfFrameSection = Ctx->getELFSection(".debug_frame", DebugSecType, 0);
 547   DwarfPubNamesSection =
 548       Ctx->getELFSection(".debug_pubnames", DebugSecType, 0);
 549   DwarfPubTypesSection =
 550       Ctx->getELFSection(".debug_pubtypes", DebugSecType, 0);
 551   DwarfGnuPubNamesSection =
 552       Ctx->getELFSection(".debug_gnu_pubnames", DebugSecType, 0);
 553   DwarfGnuPubTypesSection =
 554       Ctx->getELFSection(".debug_gnu_pubtypes", DebugSecType, 0);
 555   DwarfStrSection =
 556       Ctx->getELFSection(".debug_str", DebugSecType,
 557                          ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, "");
 558   DwarfLocSection = Ctx->getELFSection(".debug_loc", DebugSecType, 0);
 559   DwarfARangesSection =
 560       Ctx->getELFSection(".debug_aranges", DebugSecType, 0);
 561   DwarfRangesSection =
 562       Ctx->getELFSection(".debug_ranges", DebugSecType, 0);
 563   DwarfMacinfoSection =
 564       Ctx->getELFSection(".debug_macinfo", DebugSecType, 0);
 565
 566   // DWARF5 Experimental Debug Info
 567
 568   // Accelerator Tables
 569   DwarfDebugNamesSection =
 570       Ctx->getELFSection(".debug_names", ELF::SHT_PROGBITS, 0);
 571   DwarfAccelNamesSection =
 572       Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0);
 573   DwarfAccelObjCSection =
 574       Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0);
 575   DwarfAccelNamespaceSection =
 576       Ctx->getELFSection(".apple_namespaces", ELF::SHT_PROGBITS, 0);
 577   DwarfAccelTypesSection =
 578       Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0);
 579
 580   // String Offset and Address Sections
 581   DwarfStrOffSection =
 582       Ctx->getELFSection(".debug_str_offsets", DebugSecType, 0);
 583   DwarfAddrSection = Ctx->getELFSection(".debug_addr", DebugSecType, 0);
 584   DwarfRnglistsSection = Ctx->getELFSection(".debug_rnglists", DebugSecType, 0);
 585
 586   // Fission Sections
 587   DwarfInfoDWOSection =
 588       Ctx->getELFSection(".debug_info.dwo", DebugSecType, 0);
 589   DwarfTypesDWOSection =
 590       Ctx->getELFSection(".debug_types.dwo", DebugSecType, 0);
 591   DwarfAbbrevDWOSection =
 592       Ctx->getELFSection(".debug_abbrev.dwo", DebugSecType, 0);
 593   DwarfStrDWOSection =
 594       Ctx->getELFSection(".debug_str.dwo", DebugSecType,
 595                          ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, "");
 596   DwarfLineDWOSection =
 597       Ctx->getELFSection(".debug_line.dwo", DebugSecType, 0);
 598   DwarfLocDWOSection =
 599       Ctx->getELFSection(".debug_loc.dwo", DebugSecType, 0);
 600   DwarfStrOffDWOSection =
 601       Ctx->getELFSection(".debug_str_offsets.dwo", DebugSecType, 0);
 602   DwarfRnglistsDWOSection =
 603       Ctx->getELFSection(".debug_rnglists.dwo", DebugSecType, 0);
 604
 605   // DWP Sections
 606   DwarfCUIndexSection =
 607       Ctx->getELFSection(".debug_cu_index", DebugSecType, 0);
 608   DwarfTUIndexSection =
 609       Ctx->getELFSection(".debug_tu_index", DebugSecType, 0);
 610
 611   StackMapSection =
 612       Ctx->getELFSection(".llvm_stackmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
 613
 614   FaultMapSection =
 615       Ctx->getELFSection(".llvm_faultmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
 616
 617   EHFrameSection =
 618       Ctx->getELFSection(".eh_frame", EHSectionType, EHSectionFlags);
 619
 620   StackSizesSection = Ctx->getELFSection(".stack_sizes", ELF::SHT_PROGBITS, 0);
 621 }
 622
 623 void MCObjectFileInfo::initCOFFMCObjectFileInfo(const Triple &T) {
 624   EHFrameSection = Ctx->getCOFFSection(
 625       ".eh_frame", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 626                        COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
 627       SectionKind::getData());
 628
 629   // Set the `IMAGE_SCN_MEM_16BIT` flag when compiling for thumb mode.  This is
 630   // used to indicate to the linker that the text segment contains thumb instructions
 631   // and to set the ISA selection bit for calls accordingly.
 632   const bool IsThumb = T.getArch() == Triple::thumb;
 633
 634   CommDirectiveSupportsAlignment = true;
 635
 636   // COFF
 637   BSSSection = Ctx->getCOFFSection(
 638       ".bss", COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA |
 639                   COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
 640       SectionKind::getBSS());
 641   TextSection = Ctx->getCOFFSection(
 642       ".text",
 643       (IsThumb ? COFF::IMAGE_SCN_MEM_16BIT : (COFF::SectionCharacteristics)0) |
 644           COFF::IMAGE_SCN_CNT_CODE | COFF::IMAGE_SCN_MEM_EXECUTE |
 645           COFF::IMAGE_SCN_MEM_READ,
 646       SectionKind::getText());
 647   DataSection = Ctx->getCOFFSection(
 648       ".data", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ |
 649                    COFF::IMAGE_SCN_MEM_WRITE,
 650       SectionKind::getData());
 651   ReadOnlySection = Ctx->getCOFFSection(
 652       ".rdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
 653       SectionKind::getReadOnly());
 654
 655   // FIXME: We're emitting LSDA info into a readonly section on COFF, even
 656   // though it contains relocatable pointers.  In PIC mode, this is probably a
 657   // big runtime hit for C++ apps.  Either the contents of the LSDA need to be
 658   // adjusted or this should be a data section.
 659   if (T.getArch() == Triple::x86_64) {
 660     // On Windows 64 with SEH, the LSDA is emitted into the .xdata section
 661     LSDASection = nullptr;
 662   } else {
 663     LSDASection = Ctx->getCOFFSection(".gcc_except_table",
 664                                       COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 665                                           COFF::IMAGE_SCN_MEM_READ,
 666                                       SectionKind::getReadOnly());
 667   }
 668
 669   // Debug info.
 670   COFFDebugSymbolsSection =
 671       Ctx->getCOFFSection(".debug$S", (COFF::IMAGE_SCN_MEM_DISCARDABLE |
 672                                        COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 673                                        COFF::IMAGE_SCN_MEM_READ),
 674                           SectionKind::getMetadata());
 675   COFFDebugTypesSection =
 676       Ctx->getCOFFSection(".debug$T", (COFF::IMAGE_SCN_MEM_DISCARDABLE |
 677                                        COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 678                                        COFF::IMAGE_SCN_MEM_READ),
 679                           SectionKind::getMetadata());
 680   COFFGlobalTypeHashesSection = Ctx->getCOFFSection(
 681       ".debug$H",
 682       (COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 683        COFF::IMAGE_SCN_MEM_READ),
 684       SectionKind::getMetadata());
 685
 686   DwarfAbbrevSection = Ctx->getCOFFSection(
 687       ".debug_abbrev",
 688       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 689           COFF::IMAGE_SCN_MEM_READ,
 690       SectionKind::getMetadata(), "section_abbrev");
 691   DwarfInfoSection = Ctx->getCOFFSection(
 692       ".debug_info",
 693       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 694           COFF::IMAGE_SCN_MEM_READ,
 695       SectionKind::getMetadata(), "section_info");
 696   DwarfLineSection = Ctx->getCOFFSection(
 697       ".debug_line",
 698       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 699           COFF::IMAGE_SCN_MEM_READ,
 700       SectionKind::getMetadata(), "section_line");
 701   DwarfLineStrSection = Ctx->getCOFFSection(
 702       ".debug_line_str",
 703       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 704           COFF::IMAGE_SCN_MEM_READ,
 705       SectionKind::getMetadata(), "section_line_str");
 706   DwarfFrameSection = Ctx->getCOFFSection(
 707       ".debug_frame",
 708       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 709           COFF::IMAGE_SCN_MEM_READ,
 710       SectionKind::getMetadata());
 711   DwarfPubNamesSection = Ctx->getCOFFSection(
 712       ".debug_pubnames",
 713       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 714           COFF::IMAGE_SCN_MEM_READ,
 715       SectionKind::getMetadata());
 716   DwarfPubTypesSection = Ctx->getCOFFSection(
 717       ".debug_pubtypes",
 718       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 719           COFF::IMAGE_SCN_MEM_READ,
 720       SectionKind::getMetadata());
 721   DwarfGnuPubNamesSection = Ctx->getCOFFSection(
 722       ".debug_gnu_pubnames",
 723       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 724           COFF::IMAGE_SCN_MEM_READ,
 725       SectionKind::getMetadata());
 726   DwarfGnuPubTypesSection = Ctx->getCOFFSection(
 727       ".debug_gnu_pubtypes",
 728       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 729           COFF::IMAGE_SCN_MEM_READ,
 730       SectionKind::getMetadata());
 731   DwarfStrSection = Ctx->getCOFFSection(
 732       ".debug_str",
 733       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 734           COFF::IMAGE_SCN_MEM_READ,
 735       SectionKind::getMetadata(), "info_string");
 736   DwarfStrOffSection = Ctx->getCOFFSection(
 737       ".debug_str_offsets",
 738       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 739           COFF::IMAGE_SCN_MEM_READ,
 740       SectionKind::getMetadata(), "section_str_off");
 741   DwarfLocSection = Ctx->getCOFFSection(
 742       ".debug_loc",
 743       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 744           COFF::IMAGE_SCN_MEM_READ,
 745       SectionKind::getMetadata(), "section_debug_loc");
 746   DwarfARangesSection = Ctx->getCOFFSection(
 747       ".debug_aranges",
 748       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 749           COFF::IMAGE_SCN_MEM_READ,
 750       SectionKind::getMetadata());
 751   DwarfRangesSection = Ctx->getCOFFSection(
 752       ".debug_ranges",
 753       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 754           COFF::IMAGE_SCN_MEM_READ,
 755       SectionKind::getMetadata(), "debug_range");
 756   DwarfMacinfoSection = Ctx->getCOFFSection(
 757       ".debug_macinfo",
 758       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 759           COFF::IMAGE_SCN_MEM_READ,
 760       SectionKind::getMetadata(), "debug_macinfo");
 761   DwarfInfoDWOSection = Ctx->getCOFFSection(
 762       ".debug_info.dwo",
 763       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 764           COFF::IMAGE_SCN_MEM_READ,
 765       SectionKind::getMetadata(), "section_info_dwo");
 766   DwarfTypesDWOSection = Ctx->getCOFFSection(
 767       ".debug_types.dwo",
 768       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 769           COFF::IMAGE_SCN_MEM_READ,
 770       SectionKind::getMetadata(), "section_types_dwo");
 771   DwarfAbbrevDWOSection = Ctx->getCOFFSection(
 772       ".debug_abbrev.dwo",
 773       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 774           COFF::IMAGE_SCN_MEM_READ,
 775       SectionKind::getMetadata(), "section_abbrev_dwo");
 776   DwarfStrDWOSection = Ctx->getCOFFSection(
 777       ".debug_str.dwo",
 778       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 779           COFF::IMAGE_SCN_MEM_READ,
 780       SectionKind::getMetadata(), "skel_string");
 781   DwarfLineDWOSection = Ctx->getCOFFSection(
 782       ".debug_line.dwo",
 783       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 784           COFF::IMAGE_SCN_MEM_READ,
 785       SectionKind::getMetadata());
 786   DwarfLocDWOSection = Ctx->getCOFFSection(
 787       ".debug_loc.dwo",
 788       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 789           COFF::IMAGE_SCN_MEM_READ,
 790       SectionKind::getMetadata(), "skel_loc");
 791   DwarfStrOffDWOSection = Ctx->getCOFFSection(
 792       ".debug_str_offsets.dwo",
 793       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 794           COFF::IMAGE_SCN_MEM_READ,
 795       SectionKind::getMetadata(), "section_str_off_dwo");
 796   DwarfAddrSection = Ctx->getCOFFSection(
 797       ".debug_addr",
 798       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 799           COFF::IMAGE_SCN_MEM_READ,
 800       SectionKind::getMetadata(), "addr_sec");
 801   DwarfCUIndexSection = Ctx->getCOFFSection(
 802       ".debug_cu_index",
 803       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 804           COFF::IMAGE_SCN_MEM_READ,
 805       SectionKind::getMetadata());
 806   DwarfTUIndexSection = Ctx->getCOFFSection(
 807       ".debug_tu_index",
 808       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 809           COFF::IMAGE_SCN_MEM_READ,
 810       SectionKind::getMetadata());
 811   DwarfDebugNamesSection = Ctx->getCOFFSection(
 812       ".debug_names",
 813       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 814           COFF::IMAGE_SCN_MEM_READ,
 815       SectionKind::getMetadata(), "debug_names_begin");
 816   DwarfAccelNamesSection = Ctx->getCOFFSection(
 817       ".apple_names",
 818       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 819           COFF::IMAGE_SCN_MEM_READ,
 820       SectionKind::getMetadata(), "names_begin");
 821   DwarfAccelNamespaceSection = Ctx->getCOFFSection(
 822       ".apple_namespaces",
 823       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 824           COFF::IMAGE_SCN_MEM_READ,
 825       SectionKind::getMetadata(), "namespac_begin");
 826   DwarfAccelTypesSection = Ctx->getCOFFSection(
 827       ".apple_types",
 828       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 829           COFF::IMAGE_SCN_MEM_READ,
 830       SectionKind::getMetadata(), "types_begin");
 831   DwarfAccelObjCSection = Ctx->getCOFFSection(
 832       ".apple_objc",
 833       COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 834           COFF::IMAGE_SCN_MEM_READ,
 835       SectionKind::getMetadata(), "objc_begin");
 836
 837   DrectveSection = Ctx->getCOFFSection(
 838       ".drectve", COFF::IMAGE_SCN_LNK_INFO | COFF::IMAGE_SCN_LNK_REMOVE,
 839       SectionKind::getMetadata());
 840
 841   PDataSection = Ctx->getCOFFSection(
 842       ".pdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
 843       SectionKind::getData());
 844
 845   XDataSection = Ctx->getCOFFSection(
 846       ".xdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ,
 847       SectionKind::getData());
 848
 849   SXDataSection = Ctx->getCOFFSection(".sxdata", COFF::IMAGE_SCN_LNK_INFO,
 850                                       SectionKind::getMetadata());
 851
 852   GFIDsSection = Ctx->getCOFFSection(".gfids$y",
 853                                      COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 854                                          COFF::IMAGE_SCN_MEM_READ,
 855                                      SectionKind::getMetadata());
 856
 857   TLSDataSection = Ctx->getCOFFSection(
 858       ".tls$", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ |
 859                    COFF::IMAGE_SCN_MEM_WRITE,
 860       SectionKind::getData());
 861
 862   StackMapSection = Ctx->getCOFFSection(".llvm_stackmaps",
 863                                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 864                                             COFF::IMAGE_SCN_MEM_READ,
 865                                         SectionKind::getReadOnly());
 866 }
 867
 868 void MCObjectFileInfo::initWasmMCObjectFileInfo(const Triple &T) {
 869   TextSection = Ctx->getWasmSection(".text", SectionKind::getText());
 870   DataSection = Ctx->getWasmSection(".data", SectionKind::getData());
 871
 872   DwarfLineSection =
 873       Ctx->getWasmSection(".debug_line", SectionKind::getMetadata());
 874   DwarfLineStrSection =
 875       Ctx->getWasmSection(".debug_line_str", SectionKind::getMetadata());
 876   DwarfStrSection =
 877       Ctx->getWasmSection(".debug_str", SectionKind::getMetadata());
 878   DwarfLocSection =
 879       Ctx->getWasmSection(".debug_loc", SectionKind::getMetadata());
 880   DwarfAbbrevSection =
 881       Ctx->getWasmSection(".debug_abbrev", SectionKind::getMetadata());
 882   DwarfARangesSection = Ctx->getWasmSection(".debug_aranges", SectionKind::getMetadata());
 883   DwarfRangesSection =
 884       Ctx->getWasmSection(".debug_ranges", SectionKind::getMetadata());
 885   DwarfMacinfoSection =
 886       Ctx->getWasmSection(".debug_macinfo", SectionKind::getMetadata());
 887   DwarfAddrSection = Ctx->getWasmSection(".debug_addr", SectionKind::getMetadata());
 888   DwarfCUIndexSection = Ctx->getWasmSection(".debug_cu_index", SectionKind::getMetadata());
 889   DwarfTUIndexSection = Ctx->getWasmSection(".debug_tu_index", SectionKind::getMetadata());
 890   DwarfInfoSection =
 891       Ctx->getWasmSection(".debug_info", SectionKind::getMetadata());
 892   DwarfFrameSection = Ctx->getWasmSection(".debug_frame", SectionKind::getMetadata());
 893   DwarfPubNamesSection = Ctx->getWasmSection(".debug_pubnames", SectionKind::getMetadata());
 894   DwarfPubTypesSection = Ctx->getWasmSection(".debug_pubtypes", SectionKind::getMetadata());
 895
 896   // TODO: Define more sections.
 897 }
 898
 899 void MCObjectFileInfo::InitMCObjectFileInfo(const Triple &TheTriple, bool PIC,
 900                                             MCContext &ctx,
 901                                             bool LargeCodeModel) {
 902   PositionIndependent = PIC;
 903   Ctx = &ctx;
 904
 905   // Common.
 906   CommDirectiveSupportsAlignment = true;
 907   SupportsWeakOmittedEHFrame = true;
 908   SupportsCompactUnwindWithoutEHFrame = false;
 909   OmitDwarfIfHaveCompactUnwind = false;
 910
 911   PersonalityEncoding = LSDAEncoding = FDECFIEncoding = TTypeEncoding =
 912       dwarf::DW_EH_PE_absptr;
 913
 914   CompactUnwindDwarfEHFrameOnly = 0;
 915
 916   EHFrameSection = nullptr;             // Created on demand.
 917   CompactUnwindSection = nullptr;       // Used only by selected targets.
 918   DwarfAccelNamesSection = nullptr;     // Used only by selected targets.
 919   DwarfAccelObjCSection = nullptr;      // Used only by selected targets.
 920   DwarfAccelNamespaceSection = nullptr; // Used only by selected targets.
 921   DwarfAccelTypesSection = nullptr;     // Used only by selected targets.
 922
 923   TT = TheTriple;
 924
 925   switch (TT.getObjectFormat()) {
 926   case Triple::MachO:
 927     Env = IsMachO;
 928     initMachOMCObjectFileInfo(TT);
 929     break;
 930   case Triple::COFF:
 931     if (!TT.isOSWindows())
 932       report_fatal_error(
 933           "Cannot initialize MC for non-Windows COFF object files.");
 934
 935     Env = IsCOFF;
 936     initCOFFMCObjectFileInfo(TT);
 937     break;
 938   case Triple::ELF:
 939     Env = IsELF;
 940     initELFMCObjectFileInfo(TT, LargeCodeModel);
 941     break;
 942   case Triple::Wasm:
 943     Env = IsWasm;
 944     initWasmMCObjectFileInfo(TT);
 945     break;
 946   case Triple::UnknownObjectFormat:
 947     report_fatal_error("Cannot initialize MC for unknown object file format.");
 948     break;
 949   }
 950 }
 951
 952 MCSection *MCObjectFileInfo::getDwarfTypesSection(uint64_t Hash) const {
 953   switch (TT.getObjectFormat()) {
 954   case Triple::ELF:
 955     return Ctx->getELFSection(".debug_types", ELF::SHT_PROGBITS, ELF::SHF_GROUP,
 956                               0, utostr(Hash));
 957   case Triple::MachO:
 958   case Triple::COFF:
 959   case Triple::Wasm:
 960   case Triple::UnknownObjectFormat:
 961     report_fatal_error("Cannot get DWARF types section for this object file "
 962                        "format: not implemented.");
 963     break;
 964   }
 965   llvm_unreachable("Unknown ObjectFormatType");
 966 }
 967
 968 MCSection *
 969 MCObjectFileInfo::getStackSizesSection(const MCSection &TextSec) const {
 970   if (Env != IsELF)
 971     return StackSizesSection;
 972
 973   const MCSectionELF &ElfSec = static_cast<const MCSectionELF &>(TextSec);
 974   unsigned Flags = ELF::SHF_LINK_ORDER;
 975   StringRef GroupName;
 976   if (const MCSymbol *Group = ElfSec.getGroup()) {
 977     GroupName = Group->getName();
 978     Flags |= ELF::SHF_GROUP;
 979   }
 980
 981   const MCSymbol *Link = TextSec.getBeginSymbol();
 982   auto It = StackSizesUniquing.insert({Link, StackSizesUniquing.size()});
 983   unsigned UniqueID = It.first->second;
 984
 985   return Ctx->getELFSection(".stack_sizes", ELF::SHT_PROGBITS, Flags, 0,
 986                             GroupName, UniqueID, cast<MCSymbolELF>(Link));
 987 }