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