lib/MC/MCObjectFileInfo.cpp

   1 //===-- MObjectFileInfo.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/Triple.h"
  12 #include "llvm/MC/MCContext.h"
  13 #include "llvm/MC/MCSection.h"
  14 #include "llvm/MC/MCSectionCOFF.h"
  15 #include "llvm/MC/MCSectionELF.h"
  16 #include "llvm/MC/MCSectionMachO.h"
  17 using namespace llvm;
  18
  19 void MCObjectFileInfo::InitMachOMCObjectFileInfo(Triple T) {
  20   // MachO
  21   IsFunctionEHFrameSymbolPrivate = false;
  22   SupportsWeakOmittedEHFrame = false;
  23
  24   PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel
  25     | dwarf::DW_EH_PE_sdata4;
  26   LSDAEncoding = FDEEncoding = FDECFIEncoding = dwarf::DW_EH_PE_pcrel;
  27   TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
  28     dwarf::DW_EH_PE_sdata4;
  29
  30   // .comm doesn't support alignment before Leopard.
  31   if (T.isMacOSX() && T.isMacOSXVersionLT(10, 5))
  32     CommDirectiveSupportsAlignment = false;
  33
  34   TextSection // .text
  35     = Ctx->getMachOSection("__TEXT", "__text",
  36                            MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
  37                            SectionKind::getText());
  38   DataSection // .data
  39     = Ctx->getMachOSection("__DATA", "__data", 0,
  40                            SectionKind::getDataRel());
  41
  42   // BSSSection might not be expected initialized on msvc.
  43   BSSSection = 0;
  44
  45   TLSDataSection // .tdata
  46     = Ctx->getMachOSection("__DATA", "__thread_data",
  47                            MCSectionMachO::S_THREAD_LOCAL_REGULAR,
  48                            SectionKind::getDataRel());
  49   TLSBSSSection // .tbss
  50     = Ctx->getMachOSection("__DATA", "__thread_bss",
  51                            MCSectionMachO::S_THREAD_LOCAL_ZEROFILL,
  52                            SectionKind::getThreadBSS());
  53
  54   // TODO: Verify datarel below.
  55   TLSTLVSection // .tlv
  56     = Ctx->getMachOSection("__DATA", "__thread_vars",
  57                            MCSectionMachO::S_THREAD_LOCAL_VARIABLES,
  58                            SectionKind::getDataRel());
  59
  60   TLSThreadInitSection
  61     = Ctx->getMachOSection("__DATA", "__thread_init",
  62                           MCSectionMachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS,
  63                           SectionKind::getDataRel());
  64
  65   CStringSection // .cstring
  66     = Ctx->getMachOSection("__TEXT", "__cstring",
  67                            MCSectionMachO::S_CSTRING_LITERALS,
  68                            SectionKind::getMergeable1ByteCString());
  69   UStringSection
  70     = Ctx->getMachOSection("__TEXT","__ustring", 0,
  71                            SectionKind::getMergeable2ByteCString());
  72   FourByteConstantSection // .literal4
  73     = Ctx->getMachOSection("__TEXT", "__literal4",
  74                            MCSectionMachO::S_4BYTE_LITERALS,
  75                            SectionKind::getMergeableConst4());
  76   EightByteConstantSection // .literal8
  77     = Ctx->getMachOSection("__TEXT", "__literal8",
  78                            MCSectionMachO::S_8BYTE_LITERALS,
  79                            SectionKind::getMergeableConst8());
  80
  81   // ld_classic doesn't support .literal16 in 32-bit mode, and ld64 falls back
  82   // to using it in -static mode.
  83   SixteenByteConstantSection = 0;
  84   if (RelocM != Reloc::Static &&
  85       T.getArch() != Triple::x86_64 && T.getArch() != Triple::ppc64 &&
  86       T.getArch() != Triple::ppc64le)
  87     SixteenByteConstantSection =   // .literal16
  88       Ctx->getMachOSection("__TEXT", "__literal16",
  89                            MCSectionMachO::S_16BYTE_LITERALS,
  90                            SectionKind::getMergeableConst16());
  91
  92   ReadOnlySection  // .const
  93     = Ctx->getMachOSection("__TEXT", "__const", 0,
  94                            SectionKind::getReadOnly());
  95
  96   TextCoalSection
  97     = Ctx->getMachOSection("__TEXT", "__textcoal_nt",
  98                            MCSectionMachO::S_COALESCED |
  99                            MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
 100                            SectionKind::getText());
 101   ConstTextCoalSection
 102     = Ctx->getMachOSection("__TEXT", "__const_coal",
 103                            MCSectionMachO::S_COALESCED,
 104                            SectionKind::getReadOnly());
 105   ConstDataSection  // .const_data
 106     = Ctx->getMachOSection("__DATA", "__const", 0,
 107                            SectionKind::getReadOnlyWithRel());
 108   DataCoalSection
 109     = Ctx->getMachOSection("__DATA","__datacoal_nt",
 110                            MCSectionMachO::S_COALESCED,
 111                            SectionKind::getDataRel());
 112   DataCommonSection
 113     = Ctx->getMachOSection("__DATA","__common",
 114                            MCSectionMachO::S_ZEROFILL,
 115                            SectionKind::getBSS());
 116   DataBSSSection
 117     = Ctx->getMachOSection("__DATA","__bss", MCSectionMachO::S_ZEROFILL,
 118                            SectionKind::getBSS());
 119
 120
 121   LazySymbolPointerSection
 122     = Ctx->getMachOSection("__DATA", "__la_symbol_ptr",
 123                            MCSectionMachO::S_LAZY_SYMBOL_POINTERS,
 124                            SectionKind::getMetadata());
 125   NonLazySymbolPointerSection
 126     = Ctx->getMachOSection("__DATA", "__nl_symbol_ptr",
 127                            MCSectionMachO::S_NON_LAZY_SYMBOL_POINTERS,
 128                            SectionKind::getMetadata());
 129
 130   if (RelocM == Reloc::Static) {
 131     StaticCtorSection
 132       = Ctx->getMachOSection("__TEXT", "__constructor", 0,
 133                              SectionKind::getDataRel());
 134     StaticDtorSection
 135       = Ctx->getMachOSection("__TEXT", "__destructor", 0,
 136                              SectionKind::getDataRel());
 137   } else {
 138     StaticCtorSection
 139       = Ctx->getMachOSection("__DATA", "__mod_init_func",
 140                              MCSectionMachO::S_MOD_INIT_FUNC_POINTERS,
 141                              SectionKind::getDataRel());
 142     StaticDtorSection
 143       = Ctx->getMachOSection("__DATA", "__mod_term_func",
 144                              MCSectionMachO::S_MOD_TERM_FUNC_POINTERS,
 145                              SectionKind::getDataRel());
 146   }
 147
 148   // Exception Handling.
 149   LSDASection = Ctx->getMachOSection("__TEXT", "__gcc_except_tab", 0,
 150                                      SectionKind::getReadOnlyWithRel());
 151
 152   if (T.isMacOSX() && !T.isMacOSXVersionLT(10, 6)) {
 153     CompactUnwindSection =
 154       Ctx->getMachOSection("__LD", "__compact_unwind",
 155                            MCSectionMachO::S_ATTR_DEBUG,
 156                            SectionKind::getReadOnly());
 157
 158     if (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86)
 159       CompactUnwindDwarfEHFrameOnly = 0x04000000;
 160   }
 161
 162   // Debug Information.
 163   DwarfAccelNamesSection =
 164     Ctx->getMachOSection("__DWARF", "__apple_names",
 165                          MCSectionMachO::S_ATTR_DEBUG,
 166                          SectionKind::getMetadata());
 167   DwarfAccelObjCSection =
 168     Ctx->getMachOSection("__DWARF", "__apple_objc",
 169                          MCSectionMachO::S_ATTR_DEBUG,
 170                          SectionKind::getMetadata());
 171   // 16 character section limit...
 172   DwarfAccelNamespaceSection =
 173     Ctx->getMachOSection("__DWARF", "__apple_namespac",
 174                          MCSectionMachO::S_ATTR_DEBUG,
 175                          SectionKind::getMetadata());
 176   DwarfAccelTypesSection =
 177     Ctx->getMachOSection("__DWARF", "__apple_types",
 178                          MCSectionMachO::S_ATTR_DEBUG,
 179                          SectionKind::getMetadata());
 180
 181   DwarfAbbrevSection =
 182     Ctx->getMachOSection("__DWARF", "__debug_abbrev",
 183                          MCSectionMachO::S_ATTR_DEBUG,
 184                          SectionKind::getMetadata());
 185   DwarfInfoSection =
 186     Ctx->getMachOSection("__DWARF", "__debug_info",
 187                          MCSectionMachO::S_ATTR_DEBUG,
 188                          SectionKind::getMetadata());
 189   DwarfLineSection =
 190     Ctx->getMachOSection("__DWARF", "__debug_line",
 191                          MCSectionMachO::S_ATTR_DEBUG,
 192                          SectionKind::getMetadata());
 193   DwarfFrameSection =
 194     Ctx->getMachOSection("__DWARF", "__debug_frame",
 195                          MCSectionMachO::S_ATTR_DEBUG,
 196                          SectionKind::getMetadata());
 197   DwarfPubNamesSection =
 198     Ctx->getMachOSection("__DWARF", "__debug_pubnames",
 199                          MCSectionMachO::S_ATTR_DEBUG,
 200                          SectionKind::getMetadata());
 201   DwarfPubTypesSection =
 202     Ctx->getMachOSection("__DWARF", "__debug_pubtypes",
 203                          MCSectionMachO::S_ATTR_DEBUG,
 204                          SectionKind::getMetadata());
 205   DwarfGnuPubNamesSection =
 206     Ctx->getMachOSection("__DWARF", "__debug_gnu_pubn",
 207                          MCSectionMachO::S_ATTR_DEBUG,
 208                          SectionKind::getMetadata());
 209   DwarfGnuPubTypesSection =
 210     Ctx->getMachOSection("__DWARF", "__debug_gnu_pubt",
 211                          MCSectionMachO::S_ATTR_DEBUG,
 212                          SectionKind::getMetadata());
 213   DwarfStrSection =
 214     Ctx->getMachOSection("__DWARF", "__debug_str",
 215                          MCSectionMachO::S_ATTR_DEBUG,
 216                          SectionKind::getMetadata());
 217   DwarfLocSection =
 218     Ctx->getMachOSection("__DWARF", "__debug_loc",
 219                          MCSectionMachO::S_ATTR_DEBUG,
 220                          SectionKind::getMetadata());
 221   DwarfARangesSection =
 222     Ctx->getMachOSection("__DWARF", "__debug_aranges",
 223                          MCSectionMachO::S_ATTR_DEBUG,
 224                          SectionKind::getMetadata());
 225   DwarfRangesSection =
 226     Ctx->getMachOSection("__DWARF", "__debug_ranges",
 227                          MCSectionMachO::S_ATTR_DEBUG,
 228                          SectionKind::getMetadata());
 229   DwarfMacroInfoSection =
 230     Ctx->getMachOSection("__DWARF", "__debug_macinfo",
 231                          MCSectionMachO::S_ATTR_DEBUG,
 232                          SectionKind::getMetadata());
 233   DwarfDebugInlineSection =
 234     Ctx->getMachOSection("__DWARF", "__debug_inlined",
 235                          MCSectionMachO::S_ATTR_DEBUG,
 236                          SectionKind::getMetadata());
 237
 238   TLSExtraDataSection = TLSTLVSection;
 239 }
 240
 241 void MCObjectFileInfo::InitELFMCObjectFileInfo(Triple T) {
 242   if (T.getArch() == Triple::mips ||
 243       T.getArch() == Triple::mipsel)
 244     FDECFIEncoding = dwarf::DW_EH_PE_sdata4;
 245   else if (T.getArch() == Triple::mips64 ||
 246            T.getArch() == Triple::mips64el)
 247     FDECFIEncoding = dwarf::DW_EH_PE_sdata8;
 248   else
 249     FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 250
 251   if (T.getArch() == Triple::x86) {
 252     PersonalityEncoding = (RelocM == Reloc::PIC_)
 253      ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
 254      : dwarf::DW_EH_PE_absptr;
 255     LSDAEncoding = (RelocM == Reloc::PIC_)
 256       ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
 257       : dwarf::DW_EH_PE_absptr;
 258     FDEEncoding = (RelocM == Reloc::PIC_)
 259       ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
 260       : dwarf::DW_EH_PE_absptr;
 261     TTypeEncoding = (RelocM == Reloc::PIC_)
 262      ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
 263      : dwarf::DW_EH_PE_absptr;
 264   } else if (T.getArch() == Triple::x86_64) {
 265     if (RelocM == Reloc::PIC_) {
 266       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 267         ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
 268          ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
 269       LSDAEncoding = dwarf::DW_EH_PE_pcrel |
 270         (CMModel == CodeModel::Small
 271          ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
 272       FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 273       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 274         ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
 275          ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
 276     } else {
 277       PersonalityEncoding =
 278         (CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
 279         ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
 280       LSDAEncoding = (CMModel == CodeModel::Small)
 281         ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
 282       FDEEncoding = dwarf::DW_EH_PE_udata4;
 283       TTypeEncoding = (CMModel == CodeModel::Small)
 284         ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
 285     }
 286   }  else if (T.getArch() ==  Triple::aarch64) {
 287     // The small model guarantees static code/data size < 4GB, but not where it
 288     // will be in memory. Most of these could end up >2GB away so even a signed
 289     // pc-relative 32-bit address is insufficient, theoretically.
 290     if (RelocM == Reloc::PIC_) {
 291       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 292         dwarf::DW_EH_PE_sdata8;
 293       LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8;
 294       FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 295       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 296         dwarf::DW_EH_PE_sdata8;
 297     } else {
 298       PersonalityEncoding = dwarf::DW_EH_PE_absptr;
 299       LSDAEncoding = dwarf::DW_EH_PE_absptr;
 300       FDEEncoding = dwarf::DW_EH_PE_udata4;
 301       TTypeEncoding = dwarf::DW_EH_PE_absptr;
 302     }
 303   } else if (T.getArch() == Triple::ppc64 || T.getArch() == Triple::ppc64le) {
 304     PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 305       dwarf::DW_EH_PE_udata8;
 306     LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
 307     FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
 308     TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 309       dwarf::DW_EH_PE_udata8;
 310   } else if (T.getArch() == Triple::systemz) {
 311     // All currently-defined code models guarantee that 4-byte PC-relative
 312     // values will be in range.
 313     if (RelocM == Reloc::PIC_) {
 314       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 315         dwarf::DW_EH_PE_sdata4;
 316       LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 317       FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 318       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 319         dwarf::DW_EH_PE_sdata4;
 320     } else {
 321       PersonalityEncoding = dwarf::DW_EH_PE_absptr;
 322       LSDAEncoding = dwarf::DW_EH_PE_absptr;
 323       FDEEncoding = dwarf::DW_EH_PE_absptr;
 324       TTypeEncoding = dwarf::DW_EH_PE_absptr;
 325     }
 326   }
 327
 328   // Solaris requires different flags for .eh_frame to seemingly every other
 329   // platform.
 330   EHSectionType = ELF::SHT_PROGBITS;
 331   EHSectionFlags = ELF::SHF_ALLOC;
 332   if (T.getOS() == Triple::Solaris) {
 333     if (T.getArch() == Triple::x86_64)
 334       EHSectionType = ELF::SHT_X86_64_UNWIND;
 335     else
 336       EHSectionFlags |= ELF::SHF_WRITE;
 337   }
 338
 339
 340   // ELF
 341   BSSSection =
 342     Ctx->getELFSection(".bss", ELF::SHT_NOBITS,
 343                        ELF::SHF_WRITE | ELF::SHF_ALLOC,
 344                        SectionKind::getBSS());
 345
 346   TextSection =
 347     Ctx->getELFSection(".text", ELF::SHT_PROGBITS,
 348                        ELF::SHF_EXECINSTR |
 349                        ELF::SHF_ALLOC,
 350                        SectionKind::getText());
 351
 352   DataSection =
 353     Ctx->getELFSection(".data", ELF::SHT_PROGBITS,
 354                        ELF::SHF_WRITE |ELF::SHF_ALLOC,
 355                        SectionKind::getDataRel());
 356
 357   ReadOnlySection =
 358     Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS,
 359                        ELF::SHF_ALLOC,
 360                        SectionKind::getReadOnly());
 361
 362   TLSDataSection =
 363     Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS,
 364                        ELF::SHF_ALLOC | ELF::SHF_TLS |
 365                        ELF::SHF_WRITE,
 366                        SectionKind::getThreadData());
 367
 368   TLSBSSSection =
 369     Ctx->getELFSection(".tbss", ELF::SHT_NOBITS,
 370                        ELF::SHF_ALLOC | ELF::SHF_TLS |
 371                        ELF::SHF_WRITE,
 372                        SectionKind::getThreadBSS());
 373
 374   DataRelSection =
 375     Ctx->getELFSection(".data.rel", ELF::SHT_PROGBITS,
 376                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 377                        SectionKind::getDataRel());
 378
 379   DataRelLocalSection =
 380     Ctx->getELFSection(".data.rel.local", ELF::SHT_PROGBITS,
 381                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 382                        SectionKind::getDataRelLocal());
 383
 384   DataRelROSection =
 385     Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS,
 386                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 387                        SectionKind::getReadOnlyWithRel());
 388
 389   DataRelROLocalSection =
 390     Ctx->getELFSection(".data.rel.ro.local", ELF::SHT_PROGBITS,
 391                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 392                        SectionKind::getReadOnlyWithRelLocal());
 393
 394   MergeableConst4Section =
 395     Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS,
 396                        ELF::SHF_ALLOC |ELF::SHF_MERGE,
 397                        SectionKind::getMergeableConst4());
 398
 399   MergeableConst8Section =
 400     Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS,
 401                        ELF::SHF_ALLOC |ELF::SHF_MERGE,
 402                        SectionKind::getMergeableConst8());
 403
 404   MergeableConst16Section =
 405     Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS,
 406                        ELF::SHF_ALLOC |ELF::SHF_MERGE,
 407                        SectionKind::getMergeableConst16());
 408
 409   StaticCtorSection =
 410     Ctx->getELFSection(".ctors", ELF::SHT_PROGBITS,
 411                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 412                        SectionKind::getDataRel());
 413
 414   StaticDtorSection =
 415     Ctx->getELFSection(".dtors", ELF::SHT_PROGBITS,
 416                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 417                        SectionKind::getDataRel());
 418
 419   // Exception Handling Sections.
 420
 421   // FIXME: We're emitting LSDA info into a readonly section on ELF, even though
 422   // it contains relocatable pointers.  In PIC mode, this is probably a big
 423   // runtime hit for C++ apps.  Either the contents of the LSDA need to be
 424   // adjusted or this should be a data section.
 425   LSDASection =
 426     Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS,
 427                        ELF::SHF_ALLOC,
 428                        SectionKind::getReadOnly());
 429
 430   // Debug Info Sections.
 431   DwarfAbbrevSection =
 432     Ctx->getELFSection(".debug_abbrev", ELF::SHT_PROGBITS, 0,
 433                        SectionKind::getMetadata());
 434   DwarfInfoSection =
 435     Ctx->getELFSection(".debug_info", ELF::SHT_PROGBITS, 0,
 436                        SectionKind::getMetadata());
 437   DwarfLineSection =
 438     Ctx->getELFSection(".debug_line", ELF::SHT_PROGBITS, 0,
 439                        SectionKind::getMetadata());
 440   DwarfFrameSection =
 441     Ctx->getELFSection(".debug_frame", ELF::SHT_PROGBITS, 0,
 442                        SectionKind::getMetadata());
 443   DwarfPubNamesSection =
 444     Ctx->getELFSection(".debug_pubnames", ELF::SHT_PROGBITS, 0,
 445                        SectionKind::getMetadata());
 446   DwarfPubTypesSection =
 447     Ctx->getELFSection(".debug_pubtypes", ELF::SHT_PROGBITS, 0,
 448                        SectionKind::getMetadata());
 449   DwarfGnuPubNamesSection =
 450     Ctx->getELFSection(".debug_gnu_pubnames", ELF::SHT_PROGBITS, 0,
 451                        SectionKind::getMetadata());
 452   DwarfGnuPubTypesSection =
 453     Ctx->getELFSection(".debug_gnu_pubtypes", ELF::SHT_PROGBITS, 0,
 454                        SectionKind::getMetadata());
 455   DwarfStrSection =
 456     Ctx->getELFSection(".debug_str", ELF::SHT_PROGBITS,
 457                        ELF::SHF_MERGE | ELF::SHF_STRINGS,
 458                        SectionKind::getMergeable1ByteCString());
 459   DwarfLocSection =
 460     Ctx->getELFSection(".debug_loc", ELF::SHT_PROGBITS, 0,
 461                        SectionKind::getMetadata());
 462   DwarfARangesSection =
 463     Ctx->getELFSection(".debug_aranges", ELF::SHT_PROGBITS, 0,
 464                        SectionKind::getMetadata());
 465   DwarfRangesSection =
 466     Ctx->getELFSection(".debug_ranges", ELF::SHT_PROGBITS, 0,
 467                        SectionKind::getMetadata());
 468   DwarfMacroInfoSection =
 469     Ctx->getELFSection(".debug_macinfo", ELF::SHT_PROGBITS, 0,
 470                        SectionKind::getMetadata());
 471
 472   // DWARF5 Experimental Debug Info
 473
 474   // Accelerator Tables
 475   DwarfAccelNamesSection =
 476     Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0,
 477                        SectionKind::getMetadata());
 478   DwarfAccelObjCSection =
 479     Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0,
 480                        SectionKind::getMetadata());
 481   DwarfAccelNamespaceSection =
 482     Ctx->getELFSection(".apple_namespaces", ELF::SHT_PROGBITS, 0,
 483                        SectionKind::getMetadata());
 484   DwarfAccelTypesSection =
 485     Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0,
 486                        SectionKind::getMetadata());
 487
 488   // Fission Sections
 489   DwarfInfoDWOSection =
 490     Ctx->getELFSection(".debug_info.dwo", ELF::SHT_PROGBITS, 0,
 491                        SectionKind::getMetadata());
 492   DwarfAbbrevDWOSection =
 493     Ctx->getELFSection(".debug_abbrev.dwo", ELF::SHT_PROGBITS, 0,
 494                        SectionKind::getMetadata());
 495   DwarfStrDWOSection =
 496     Ctx->getELFSection(".debug_str.dwo", ELF::SHT_PROGBITS,
 497                        ELF::SHF_MERGE | ELF::SHF_STRINGS,
 498                        SectionKind::getMergeable1ByteCString());
 499   DwarfLineDWOSection =
 500     Ctx->getELFSection(".debug_line.dwo", ELF::SHT_PROGBITS, 0,
 501                        SectionKind::getMetadata());
 502   DwarfLocDWOSection =
 503     Ctx->getELFSection(".debug_loc.dwo", ELF::SHT_PROGBITS, 0,
 504                        SectionKind::getMetadata());
 505   DwarfStrOffDWOSection =
 506     Ctx->getELFSection(".debug_str_offsets.dwo", ELF::SHT_PROGBITS, 0,
 507                        SectionKind::getMetadata());
 508   DwarfAddrSection =
 509     Ctx->getELFSection(".debug_addr", ELF::SHT_PROGBITS, 0,
 510                        SectionKind::getMetadata());
 511 }
 512
 513
 514 void MCObjectFileInfo::InitCOFFMCObjectFileInfo(Triple T) {
 515   // COFF
 516   BSSSection =
 517     Ctx->getCOFFSection(".bss",
 518                         COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA |
 519                         COFF::IMAGE_SCN_MEM_READ |
 520                         COFF::IMAGE_SCN_MEM_WRITE,
 521                         SectionKind::getBSS());
 522   TextSection =
 523     Ctx->getCOFFSection(".text",
 524                         COFF::IMAGE_SCN_CNT_CODE |
 525                         COFF::IMAGE_SCN_MEM_EXECUTE |
 526                         COFF::IMAGE_SCN_MEM_READ,
 527                         SectionKind::getText());
 528   DataSection =
 529     Ctx->getCOFFSection(".data",
 530                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 531                         COFF::IMAGE_SCN_MEM_READ |
 532                         COFF::IMAGE_SCN_MEM_WRITE,
 533                         SectionKind::getDataRel());
 534   ReadOnlySection =
 535     Ctx->getCOFFSection(".rdata",
 536                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 537                         COFF::IMAGE_SCN_MEM_READ,
 538                         SectionKind::getReadOnly());
 539   if (T.getOS() == Triple::Win32) {
 540     StaticCtorSection =
 541       Ctx->getCOFFSection(".CRT$XCU",
 542                           COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 543                           COFF::IMAGE_SCN_MEM_READ,
 544                           SectionKind::getReadOnly());
 545   } else {
 546     StaticCtorSection =
 547       Ctx->getCOFFSection(".ctors",
 548                           COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 549                           COFF::IMAGE_SCN_MEM_READ |
 550                           COFF::IMAGE_SCN_MEM_WRITE,
 551                           SectionKind::getDataRel());
 552   }
 553
 554
 555   if (T.getOS() == Triple::Win32) {
 556     StaticDtorSection =
 557       Ctx->getCOFFSection(".CRT$XTX",
 558                           COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 559                           COFF::IMAGE_SCN_MEM_READ,
 560                           SectionKind::getReadOnly());
 561   } else {
 562     StaticDtorSection =
 563       Ctx->getCOFFSection(".dtors",
 564                           COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 565                           COFF::IMAGE_SCN_MEM_READ |
 566                           COFF::IMAGE_SCN_MEM_WRITE,
 567                           SectionKind::getDataRel());
 568   }
 569
 570   // FIXME: We're emitting LSDA info into a readonly section on COFF, even
 571   // though it contains relocatable pointers.  In PIC mode, this is probably a
 572   // big runtime hit for C++ apps.  Either the contents of the LSDA need to be
 573   // adjusted or this should be a data section.
 574   LSDASection =
 575     Ctx->getCOFFSection(".gcc_except_table",
 576                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 577                         COFF::IMAGE_SCN_MEM_READ,
 578                         SectionKind::getReadOnly());
 579
 580   // Debug info.
 581   DwarfAbbrevSection =
 582     Ctx->getCOFFSection(".debug_abbrev",
 583                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 584                         COFF::IMAGE_SCN_MEM_READ,
 585                         SectionKind::getMetadata());
 586   DwarfInfoSection =
 587     Ctx->getCOFFSection(".debug_info",
 588                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 589                         COFF::IMAGE_SCN_MEM_READ,
 590                         SectionKind::getMetadata());
 591   DwarfLineSection =
 592     Ctx->getCOFFSection(".debug_line",
 593                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 594                         COFF::IMAGE_SCN_MEM_READ,
 595                         SectionKind::getMetadata());
 596   DwarfFrameSection =
 597     Ctx->getCOFFSection(".debug_frame",
 598                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 599                         COFF::IMAGE_SCN_MEM_READ,
 600                         SectionKind::getMetadata());
 601   DwarfPubNamesSection =
 602     Ctx->getCOFFSection(".debug_pubnames",
 603                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 604                         COFF::IMAGE_SCN_MEM_READ,
 605                         SectionKind::getMetadata());
 606   DwarfPubTypesSection =
 607     Ctx->getCOFFSection(".debug_pubtypes",
 608                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 609                         COFF::IMAGE_SCN_MEM_READ,
 610                         SectionKind::getMetadata());
 611   DwarfGnuPubNamesSection =
 612     Ctx->getCOFFSection(".debug_gnu_pubnames",
 613                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 614                         COFF::IMAGE_SCN_MEM_READ,
 615                         SectionKind::getMetadata());
 616   DwarfGnuPubTypesSection =
 617     Ctx->getCOFFSection(".debug_gnu_pubtypes",
 618                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 619                         COFF::IMAGE_SCN_MEM_READ,
 620                         SectionKind::getMetadata());
 621   DwarfStrSection =
 622     Ctx->getCOFFSection(".debug_str",
 623                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 624                         COFF::IMAGE_SCN_MEM_READ,
 625                         SectionKind::getMetadata());
 626   DwarfLocSection =
 627     Ctx->getCOFFSection(".debug_loc",
 628                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 629                         COFF::IMAGE_SCN_MEM_READ,
 630                         SectionKind::getMetadata());
 631   DwarfARangesSection =
 632     Ctx->getCOFFSection(".debug_aranges",
 633                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 634                         COFF::IMAGE_SCN_MEM_READ,
 635                         SectionKind::getMetadata());
 636   DwarfRangesSection =
 637     Ctx->getCOFFSection(".debug_ranges",
 638                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 639                         COFF::IMAGE_SCN_MEM_READ,
 640                         SectionKind::getMetadata());
 641   DwarfMacroInfoSection =
 642     Ctx->getCOFFSection(".debug_macinfo",
 643                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 644                         COFF::IMAGE_SCN_MEM_READ,
 645                         SectionKind::getMetadata());
 646
 647   DrectveSection =
 648     Ctx->getCOFFSection(".drectve",
 649                         COFF::IMAGE_SCN_LNK_INFO,
 650                         SectionKind::getMetadata());
 651
 652   PDataSection =
 653     Ctx->getCOFFSection(".pdata",
 654                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 655                         COFF::IMAGE_SCN_MEM_READ,
 656                         SectionKind::getDataRel());
 657
 658   XDataSection =
 659     Ctx->getCOFFSection(".xdata",
 660                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 661                         COFF::IMAGE_SCN_MEM_READ,
 662                         SectionKind::getDataRel());
 663   TLSDataSection =
 664     Ctx->getCOFFSection(".tls$",
 665                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 666                         COFF::IMAGE_SCN_MEM_READ |
 667                         COFF::IMAGE_SCN_MEM_WRITE,
 668                         SectionKind::getDataRel());
 669 }
 670
 671 void MCObjectFileInfo::InitMCObjectFileInfo(StringRef TT, Reloc::Model relocm,
 672                                             CodeModel::Model cm,
 673                                             MCContext &ctx) {
 674   RelocM = relocm;
 675   CMModel = cm;
 676   Ctx = &ctx;
 677
 678   // Common.
 679   CommDirectiveSupportsAlignment = true;
 680   SupportsWeakOmittedEHFrame = true;
 681   IsFunctionEHFrameSymbolPrivate = true;
 682
 683   PersonalityEncoding = LSDAEncoding = FDEEncoding = FDECFIEncoding =
 684     TTypeEncoding = dwarf::DW_EH_PE_absptr;
 685
 686   CompactUnwindDwarfEHFrameOnly = 0;
 687
 688   EHFrameSection = 0;             // Created on demand.
 689   CompactUnwindSection = 0;       // Used only by selected targets.
 690   DwarfAccelNamesSection = 0;     // Used only by selected targets.
 691   DwarfAccelObjCSection = 0;      // Used only by selected targets.
 692   DwarfAccelNamespaceSection = 0; // Used only by selected targets.
 693   DwarfAccelTypesSection = 0;     // Used only by selected targets.
 694
 695   Triple T(TT);
 696   Triple::ArchType Arch = T.getArch();
 697   // FIXME: Checking for Arch here to filter out bogus triples such as
 698   // cellspu-apple-darwin. Perhaps we should fix in Triple?
 699   if ((Arch == Triple::x86 || Arch == Triple::x86_64 ||
 700        Arch == Triple::arm || Arch == Triple::thumb ||
 701        Arch == Triple::ppc || Arch == Triple::ppc64 ||
 702        Arch == Triple::UnknownArch) &&
 703       (T.isOSDarwin() || T.getEnvironment() == Triple::MachO)) {
 704     Env = IsMachO;
 705     InitMachOMCObjectFileInfo(T);
 706   } else if ((Arch == Triple::x86 || Arch == Triple::x86_64) &&
 707              (T.getEnvironment() != Triple::ELF) &&
 708              (T.getOS() == Triple::MinGW32 || T.getOS() == Triple::Cygwin ||
 709               T.getOS() == Triple::Win32)) {
 710     Env = IsCOFF;
 711     InitCOFFMCObjectFileInfo(T);
 712   } else {
 713     Env = IsELF;
 714     InitELFMCObjectFileInfo(T);
 715   }
 716 }
 717
 718 void MCObjectFileInfo::InitEHFrameSection() {
 719   if (Env == IsMachO)
 720     EHFrameSection =
 721       Ctx->getMachOSection("__TEXT", "__eh_frame",
 722                            MCSectionMachO::S_COALESCED |
 723                            MCSectionMachO::S_ATTR_NO_TOC |
 724                            MCSectionMachO::S_ATTR_STRIP_STATIC_SYMS |
 725                            MCSectionMachO::S_ATTR_LIVE_SUPPORT,
 726                            SectionKind::getReadOnly());
 727   else if (Env == IsELF)
 728     EHFrameSection =
 729       Ctx->getELFSection(".eh_frame", EHSectionType,
 730                          EHSectionFlags,
 731                          SectionKind::getDataRel());
 732   else
 733     EHFrameSection =
 734       Ctx->getCOFFSection(".eh_frame",
 735                           COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 736                           COFF::IMAGE_SCN_MEM_READ |
 737                           COFF::IMAGE_SCN_MEM_WRITE,
 738                           SectionKind::getDataRel());
 739 }