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   StackMapSection =
 238     Ctx->getMachOSection("__LLVM_STACKMAPS", "__llvm_stackmaps", 0,
 239                          SectionKind::getMetadata());
 240
 241   TLSExtraDataSection = TLSTLVSection;
 242 }
 243
 244 void MCObjectFileInfo::InitELFMCObjectFileInfo(Triple T) {
 245   if (T.getArch() == Triple::mips ||
 246       T.getArch() == Triple::mipsel)
 247     FDECFIEncoding = dwarf::DW_EH_PE_sdata4;
 248   else if (T.getArch() == Triple::mips64 ||
 249            T.getArch() == Triple::mips64el)
 250     FDECFIEncoding = dwarf::DW_EH_PE_sdata8;
 251   else
 252     FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 253
 254   if (T.getArch() == Triple::x86) {
 255     PersonalityEncoding = (RelocM == Reloc::PIC_)
 256      ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
 257      : dwarf::DW_EH_PE_absptr;
 258     LSDAEncoding = (RelocM == Reloc::PIC_)
 259       ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
 260       : dwarf::DW_EH_PE_absptr;
 261     FDEEncoding = (RelocM == Reloc::PIC_)
 262       ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
 263       : dwarf::DW_EH_PE_absptr;
 264     TTypeEncoding = (RelocM == Reloc::PIC_)
 265      ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
 266      : dwarf::DW_EH_PE_absptr;
 267   } else if (T.getArch() == Triple::x86_64) {
 268     if (RelocM == Reloc::PIC_) {
 269       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 270         ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
 271          ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
 272       LSDAEncoding = dwarf::DW_EH_PE_pcrel |
 273         (CMModel == CodeModel::Small
 274          ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
 275       FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 276       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 277         ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
 278          ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
 279     } else {
 280       PersonalityEncoding =
 281         (CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
 282         ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
 283       LSDAEncoding = (CMModel == CodeModel::Small)
 284         ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
 285       FDEEncoding = dwarf::DW_EH_PE_udata4;
 286       TTypeEncoding = (CMModel == CodeModel::Small)
 287         ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
 288     }
 289   }  else if (T.getArch() ==  Triple::aarch64) {
 290     // The small model guarantees static code/data size < 4GB, but not where it
 291     // will be in memory. Most of these could end up >2GB away so even a signed
 292     // pc-relative 32-bit address is insufficient, theoretically.
 293     if (RelocM == Reloc::PIC_) {
 294       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 295         dwarf::DW_EH_PE_sdata8;
 296       LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8;
 297       FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 298       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 299         dwarf::DW_EH_PE_sdata8;
 300     } else {
 301       PersonalityEncoding = dwarf::DW_EH_PE_absptr;
 302       LSDAEncoding = dwarf::DW_EH_PE_absptr;
 303       FDEEncoding = dwarf::DW_EH_PE_udata4;
 304       TTypeEncoding = dwarf::DW_EH_PE_absptr;
 305     }
 306   } else if (T.getArch() == Triple::ppc64 || T.getArch() == Triple::ppc64le) {
 307     PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 308       dwarf::DW_EH_PE_udata8;
 309     LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
 310     FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
 311     TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 312       dwarf::DW_EH_PE_udata8;
 313   } else if (T.getArch() == Triple::systemz) {
 314     // All currently-defined code models guarantee that 4-byte PC-relative
 315     // values will be in range.
 316     if (RelocM == Reloc::PIC_) {
 317       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 318         dwarf::DW_EH_PE_sdata4;
 319       LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 320       FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 321       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 322         dwarf::DW_EH_PE_sdata4;
 323     } else {
 324       PersonalityEncoding = dwarf::DW_EH_PE_absptr;
 325       LSDAEncoding = dwarf::DW_EH_PE_absptr;
 326       FDEEncoding = dwarf::DW_EH_PE_absptr;
 327       TTypeEncoding = dwarf::DW_EH_PE_absptr;
 328     }
 329   }
 330
 331   // Solaris requires different flags for .eh_frame to seemingly every other
 332   // platform.
 333   EHSectionType = ELF::SHT_PROGBITS;
 334   EHSectionFlags = ELF::SHF_ALLOC;
 335   if (T.getOS() == Triple::Solaris) {
 336     if (T.getArch() == Triple::x86_64)
 337       EHSectionType = ELF::SHT_X86_64_UNWIND;
 338     else
 339       EHSectionFlags |= ELF::SHF_WRITE;
 340   }
 341
 342
 343   // ELF
 344   BSSSection =
 345     Ctx->getELFSection(".bss", ELF::SHT_NOBITS,
 346                        ELF::SHF_WRITE | ELF::SHF_ALLOC,
 347                        SectionKind::getBSS());
 348
 349   TextSection =
 350     Ctx->getELFSection(".text", ELF::SHT_PROGBITS,
 351                        ELF::SHF_EXECINSTR |
 352                        ELF::SHF_ALLOC,
 353                        SectionKind::getText());
 354
 355   DataSection =
 356     Ctx->getELFSection(".data", ELF::SHT_PROGBITS,
 357                        ELF::SHF_WRITE |ELF::SHF_ALLOC,
 358                        SectionKind::getDataRel());
 359
 360   ReadOnlySection =
 361     Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS,
 362                        ELF::SHF_ALLOC,
 363                        SectionKind::getReadOnly());
 364
 365   TLSDataSection =
 366     Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS,
 367                        ELF::SHF_ALLOC | ELF::SHF_TLS |
 368                        ELF::SHF_WRITE,
 369                        SectionKind::getThreadData());
 370
 371   TLSBSSSection =
 372     Ctx->getELFSection(".tbss", ELF::SHT_NOBITS,
 373                        ELF::SHF_ALLOC | ELF::SHF_TLS |
 374                        ELF::SHF_WRITE,
 375                        SectionKind::getThreadBSS());
 376
 377   DataRelSection =
 378     Ctx->getELFSection(".data.rel", ELF::SHT_PROGBITS,
 379                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 380                        SectionKind::getDataRel());
 381
 382   DataRelLocalSection =
 383     Ctx->getELFSection(".data.rel.local", ELF::SHT_PROGBITS,
 384                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 385                        SectionKind::getDataRelLocal());
 386
 387   DataRelROSection =
 388     Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS,
 389                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 390                        SectionKind::getReadOnlyWithRel());
 391
 392   DataRelROLocalSection =
 393     Ctx->getELFSection(".data.rel.ro.local", ELF::SHT_PROGBITS,
 394                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 395                        SectionKind::getReadOnlyWithRelLocal());
 396
 397   MergeableConst4Section =
 398     Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS,
 399                        ELF::SHF_ALLOC |ELF::SHF_MERGE,
 400                        SectionKind::getMergeableConst4());
 401
 402   MergeableConst8Section =
 403     Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS,
 404                        ELF::SHF_ALLOC |ELF::SHF_MERGE,
 405                        SectionKind::getMergeableConst8());
 406
 407   MergeableConst16Section =
 408     Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS,
 409                        ELF::SHF_ALLOC |ELF::SHF_MERGE,
 410                        SectionKind::getMergeableConst16());
 411
 412   StaticCtorSection =
 413     Ctx->getELFSection(".ctors", ELF::SHT_PROGBITS,
 414                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 415                        SectionKind::getDataRel());
 416
 417   StaticDtorSection =
 418     Ctx->getELFSection(".dtors", ELF::SHT_PROGBITS,
 419                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 420                        SectionKind::getDataRel());
 421
 422   // Exception Handling Sections.
 423
 424   // FIXME: We're emitting LSDA info into a readonly section on ELF, even though
 425   // it contains relocatable pointers.  In PIC mode, this is probably a big
 426   // runtime hit for C++ apps.  Either the contents of the LSDA need to be
 427   // adjusted or this should be a data section.
 428   LSDASection =
 429     Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS,
 430                        ELF::SHF_ALLOC,
 431                        SectionKind::getReadOnly());
 432
 433   // Debug Info Sections.
 434   DwarfAbbrevSection =
 435     Ctx->getELFSection(".debug_abbrev", ELF::SHT_PROGBITS, 0,
 436                        SectionKind::getMetadata());
 437   DwarfInfoSection =
 438     Ctx->getELFSection(".debug_info", ELF::SHT_PROGBITS, 0,
 439                        SectionKind::getMetadata());
 440   DwarfLineSection =
 441     Ctx->getELFSection(".debug_line", ELF::SHT_PROGBITS, 0,
 442                        SectionKind::getMetadata());
 443   DwarfFrameSection =
 444     Ctx->getELFSection(".debug_frame", ELF::SHT_PROGBITS, 0,
 445                        SectionKind::getMetadata());
 446   DwarfPubNamesSection =
 447     Ctx->getELFSection(".debug_pubnames", ELF::SHT_PROGBITS, 0,
 448                        SectionKind::getMetadata());
 449   DwarfPubTypesSection =
 450     Ctx->getELFSection(".debug_pubtypes", ELF::SHT_PROGBITS, 0,
 451                        SectionKind::getMetadata());
 452   DwarfGnuPubNamesSection =
 453     Ctx->getELFSection(".debug_gnu_pubnames", ELF::SHT_PROGBITS, 0,
 454                        SectionKind::getMetadata());
 455   DwarfGnuPubTypesSection =
 456     Ctx->getELFSection(".debug_gnu_pubtypes", ELF::SHT_PROGBITS, 0,
 457                        SectionKind::getMetadata());
 458   DwarfStrSection =
 459     Ctx->getELFSection(".debug_str", ELF::SHT_PROGBITS,
 460                        ELF::SHF_MERGE | ELF::SHF_STRINGS,
 461                        SectionKind::getMergeable1ByteCString());
 462   DwarfLocSection =
 463     Ctx->getELFSection(".debug_loc", ELF::SHT_PROGBITS, 0,
 464                        SectionKind::getMetadata());
 465   DwarfARangesSection =
 466     Ctx->getELFSection(".debug_aranges", ELF::SHT_PROGBITS, 0,
 467                        SectionKind::getMetadata());
 468   DwarfRangesSection =
 469     Ctx->getELFSection(".debug_ranges", ELF::SHT_PROGBITS, 0,
 470                        SectionKind::getMetadata());
 471   DwarfMacroInfoSection =
 472     Ctx->getELFSection(".debug_macinfo", ELF::SHT_PROGBITS, 0,
 473                        SectionKind::getMetadata());
 474
 475   // DWARF5 Experimental Debug Info
 476
 477   // Accelerator Tables
 478   DwarfAccelNamesSection =
 479     Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0,
 480                        SectionKind::getMetadata());
 481   DwarfAccelObjCSection =
 482     Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0,
 483                        SectionKind::getMetadata());
 484   DwarfAccelNamespaceSection =
 485     Ctx->getELFSection(".apple_namespaces", ELF::SHT_PROGBITS, 0,
 486                        SectionKind::getMetadata());
 487   DwarfAccelTypesSection =
 488     Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0,
 489                        SectionKind::getMetadata());
 490
 491   // Fission Sections
 492   DwarfInfoDWOSection =
 493     Ctx->getELFSection(".debug_info.dwo", ELF::SHT_PROGBITS, 0,
 494                        SectionKind::getMetadata());
 495   DwarfAbbrevDWOSection =
 496     Ctx->getELFSection(".debug_abbrev.dwo", ELF::SHT_PROGBITS, 0,
 497                        SectionKind::getMetadata());
 498   DwarfStrDWOSection =
 499     Ctx->getELFSection(".debug_str.dwo", ELF::SHT_PROGBITS,
 500                        ELF::SHF_MERGE | ELF::SHF_STRINGS,
 501                        SectionKind::getMergeable1ByteCString());
 502   DwarfLineDWOSection =
 503     Ctx->getELFSection(".debug_line.dwo", ELF::SHT_PROGBITS, 0,
 504                        SectionKind::getMetadata());
 505   DwarfLocDWOSection =
 506     Ctx->getELFSection(".debug_loc.dwo", ELF::SHT_PROGBITS, 0,
 507                        SectionKind::getMetadata());
 508   DwarfStrOffDWOSection =
 509     Ctx->getELFSection(".debug_str_offsets.dwo", ELF::SHT_PROGBITS, 0,
 510                        SectionKind::getMetadata());
 511   DwarfAddrSection =
 512     Ctx->getELFSection(".debug_addr", ELF::SHT_PROGBITS, 0,
 513                        SectionKind::getMetadata());
 514 }
 515
 516
 517 void MCObjectFileInfo::InitCOFFMCObjectFileInfo(Triple T) {
 518   // COFF
 519   BSSSection =
 520     Ctx->getCOFFSection(".bss",
 521                         COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA |
 522                         COFF::IMAGE_SCN_MEM_READ |
 523                         COFF::IMAGE_SCN_MEM_WRITE,
 524                         SectionKind::getBSS());
 525   TextSection =
 526     Ctx->getCOFFSection(".text",
 527                         COFF::IMAGE_SCN_CNT_CODE |
 528                         COFF::IMAGE_SCN_MEM_EXECUTE |
 529                         COFF::IMAGE_SCN_MEM_READ,
 530                         SectionKind::getText());
 531   DataSection =
 532     Ctx->getCOFFSection(".data",
 533                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 534                         COFF::IMAGE_SCN_MEM_READ |
 535                         COFF::IMAGE_SCN_MEM_WRITE,
 536                         SectionKind::getDataRel());
 537   ReadOnlySection =
 538     Ctx->getCOFFSection(".rdata",
 539                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 540                         COFF::IMAGE_SCN_MEM_READ,
 541                         SectionKind::getReadOnly());
 542   if (T.getOS() == Triple::Win32) {
 543     StaticCtorSection =
 544       Ctx->getCOFFSection(".CRT$XCU",
 545                           COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 546                           COFF::IMAGE_SCN_MEM_READ,
 547                           SectionKind::getReadOnly());
 548   } else {
 549     StaticCtorSection =
 550       Ctx->getCOFFSection(".ctors",
 551                           COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 552                           COFF::IMAGE_SCN_MEM_READ |
 553                           COFF::IMAGE_SCN_MEM_WRITE,
 554                           SectionKind::getDataRel());
 555   }
 556
 557
 558   if (T.getOS() == Triple::Win32) {
 559     StaticDtorSection =
 560       Ctx->getCOFFSection(".CRT$XTX",
 561                           COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 562                           COFF::IMAGE_SCN_MEM_READ,
 563                           SectionKind::getReadOnly());
 564   } else {
 565     StaticDtorSection =
 566       Ctx->getCOFFSection(".dtors",
 567                           COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 568                           COFF::IMAGE_SCN_MEM_READ |
 569                           COFF::IMAGE_SCN_MEM_WRITE,
 570                           SectionKind::getDataRel());
 571   }
 572
 573   // FIXME: We're emitting LSDA info into a readonly section on COFF, even
 574   // though it contains relocatable pointers.  In PIC mode, this is probably a
 575   // big runtime hit for C++ apps.  Either the contents of the LSDA need to be
 576   // adjusted or this should be a data section.
 577   LSDASection =
 578     Ctx->getCOFFSection(".gcc_except_table",
 579                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 580                         COFF::IMAGE_SCN_MEM_READ,
 581                         SectionKind::getReadOnly());
 582
 583   // Debug info.
 584   DwarfAbbrevSection =
 585     Ctx->getCOFFSection(".debug_abbrev",
 586                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 587                         COFF::IMAGE_SCN_MEM_READ,
 588                         SectionKind::getMetadata());
 589   DwarfInfoSection =
 590     Ctx->getCOFFSection(".debug_info",
 591                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 592                         COFF::IMAGE_SCN_MEM_READ,
 593                         SectionKind::getMetadata());
 594   DwarfLineSection =
 595     Ctx->getCOFFSection(".debug_line",
 596                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 597                         COFF::IMAGE_SCN_MEM_READ,
 598                         SectionKind::getMetadata());
 599   DwarfFrameSection =
 600     Ctx->getCOFFSection(".debug_frame",
 601                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 602                         COFF::IMAGE_SCN_MEM_READ,
 603                         SectionKind::getMetadata());
 604   DwarfPubNamesSection =
 605     Ctx->getCOFFSection(".debug_pubnames",
 606                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 607                         COFF::IMAGE_SCN_MEM_READ,
 608                         SectionKind::getMetadata());
 609   DwarfPubTypesSection =
 610     Ctx->getCOFFSection(".debug_pubtypes",
 611                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 612                         COFF::IMAGE_SCN_MEM_READ,
 613                         SectionKind::getMetadata());
 614   DwarfGnuPubNamesSection =
 615     Ctx->getCOFFSection(".debug_gnu_pubnames",
 616                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 617                         COFF::IMAGE_SCN_MEM_READ,
 618                         SectionKind::getMetadata());
 619   DwarfGnuPubTypesSection =
 620     Ctx->getCOFFSection(".debug_gnu_pubtypes",
 621                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 622                         COFF::IMAGE_SCN_MEM_READ,
 623                         SectionKind::getMetadata());
 624   DwarfStrSection =
 625     Ctx->getCOFFSection(".debug_str",
 626                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 627                         COFF::IMAGE_SCN_MEM_READ,
 628                         SectionKind::getMetadata());
 629   DwarfLocSection =
 630     Ctx->getCOFFSection(".debug_loc",
 631                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 632                         COFF::IMAGE_SCN_MEM_READ,
 633                         SectionKind::getMetadata());
 634   DwarfARangesSection =
 635     Ctx->getCOFFSection(".debug_aranges",
 636                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 637                         COFF::IMAGE_SCN_MEM_READ,
 638                         SectionKind::getMetadata());
 639   DwarfRangesSection =
 640     Ctx->getCOFFSection(".debug_ranges",
 641                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 642                         COFF::IMAGE_SCN_MEM_READ,
 643                         SectionKind::getMetadata());
 644   DwarfMacroInfoSection =
 645     Ctx->getCOFFSection(".debug_macinfo",
 646                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 647                         COFF::IMAGE_SCN_MEM_READ,
 648                         SectionKind::getMetadata());
 649
 650   DrectveSection =
 651     Ctx->getCOFFSection(".drectve",
 652                         COFF::IMAGE_SCN_LNK_INFO,
 653                         SectionKind::getMetadata());
 654
 655   PDataSection =
 656     Ctx->getCOFFSection(".pdata",
 657                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 658                         COFF::IMAGE_SCN_MEM_READ,
 659                         SectionKind::getDataRel());
 660
 661   XDataSection =
 662     Ctx->getCOFFSection(".xdata",
 663                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 664                         COFF::IMAGE_SCN_MEM_READ,
 665                         SectionKind::getDataRel());
 666   TLSDataSection =
 667     Ctx->getCOFFSection(".tls$",
 668                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 669                         COFF::IMAGE_SCN_MEM_READ |
 670                         COFF::IMAGE_SCN_MEM_WRITE,
 671                         SectionKind::getDataRel());
 672 }
 673
 674 void MCObjectFileInfo::InitMCObjectFileInfo(StringRef TT, Reloc::Model relocm,
 675                                             CodeModel::Model cm,
 676                                             MCContext &ctx) {
 677   RelocM = relocm;
 678   CMModel = cm;
 679   Ctx = &ctx;
 680
 681   // Common.
 682   CommDirectiveSupportsAlignment = true;
 683   SupportsWeakOmittedEHFrame = true;
 684   IsFunctionEHFrameSymbolPrivate = true;
 685
 686   PersonalityEncoding = LSDAEncoding = FDEEncoding = FDECFIEncoding =
 687     TTypeEncoding = dwarf::DW_EH_PE_absptr;
 688
 689   CompactUnwindDwarfEHFrameOnly = 0;
 690
 691   EHFrameSection = 0;             // Created on demand.
 692   CompactUnwindSection = 0;       // Used only by selected targets.
 693   DwarfAccelNamesSection = 0;     // Used only by selected targets.
 694   DwarfAccelObjCSection = 0;      // Used only by selected targets.
 695   DwarfAccelNamespaceSection = 0; // Used only by selected targets.
 696   DwarfAccelTypesSection = 0;     // Used only by selected targets.
 697
 698   Triple T(TT);
 699   Triple::ArchType Arch = T.getArch();
 700   // FIXME: Checking for Arch here to filter out bogus triples such as
 701   // cellspu-apple-darwin. Perhaps we should fix in Triple?
 702   if ((Arch == Triple::x86 || Arch == Triple::x86_64 ||
 703        Arch == Triple::arm || Arch == Triple::thumb ||
 704        Arch == Triple::ppc || Arch == Triple::ppc64 ||
 705        Arch == Triple::UnknownArch) &&
 706       (T.isOSDarwin() || T.getEnvironment() == Triple::MachO)) {
 707     Env = IsMachO;
 708     InitMachOMCObjectFileInfo(T);
 709   } else if ((Arch == Triple::x86 || Arch == Triple::x86_64) &&
 710              (T.getEnvironment() != Triple::ELF) &&
 711              (T.getOS() == Triple::MinGW32 || T.getOS() == Triple::Cygwin ||
 712               T.getOS() == Triple::Win32)) {
 713     Env = IsCOFF;
 714     InitCOFFMCObjectFileInfo(T);
 715   } else {
 716     Env = IsELF;
 717     InitELFMCObjectFileInfo(T);
 718   }
 719 }
 720
 721 void MCObjectFileInfo::InitEHFrameSection() {
 722   if (Env == IsMachO)
 723     EHFrameSection =
 724       Ctx->getMachOSection("__TEXT", "__eh_frame",
 725                            MCSectionMachO::S_COALESCED |
 726                            MCSectionMachO::S_ATTR_NO_TOC |
 727                            MCSectionMachO::S_ATTR_STRIP_STATIC_SYMS |
 728                            MCSectionMachO::S_ATTR_LIVE_SUPPORT,
 729                            SectionKind::getReadOnly());
 730   else if (Env == IsELF)
 731     EHFrameSection =
 732       Ctx->getELFSection(".eh_frame", EHSectionType,
 733                          EHSectionFlags,
 734                          SectionKind::getDataRel());
 735   else
 736     EHFrameSection =
 737       Ctx->getCOFFSection(".eh_frame",
 738                           COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 739                           COFF::IMAGE_SCN_MEM_READ |
 740                           COFF::IMAGE_SCN_MEM_WRITE,
 741                           SectionKind::getDataRel());
 742 }