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/MC/MCContext.h"
  12 #include "llvm/MC/MCSection.h"
  13 #include "llvm/MC/MCSectionCOFF.h"
  14 #include "llvm/MC/MCSectionELF.h"
  15 #include "llvm/MC/MCSectionMachO.h"
  16 #include "llvm/ADT/Triple.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   DwarfPubNamesSection =
 190     Ctx->getMachOSection("__DWARF", "__debug_pubnames",
 191                          MCSectionMachO::S_ATTR_DEBUG,
 192                          SectionKind::getMetadata());
 193   DwarfPubTypesSection =
 194     Ctx->getMachOSection("__DWARF", "__debug_pubtypes",
 195                          MCSectionMachO::S_ATTR_DEBUG,
 196                          SectionKind::getMetadata());
 197   DwarfStrSection =
 198     Ctx->getMachOSection("__DWARF", "__debug_str",
 199                          MCSectionMachO::S_ATTR_DEBUG,
 200                          SectionKind::getMetadata());
 201   DwarfLocSection =
 202     Ctx->getMachOSection("__DWARF", "__debug_loc",
 203                          MCSectionMachO::S_ATTR_DEBUG,
 204                          SectionKind::getMetadata());
 205   DwarfARangesSection =
 206     Ctx->getMachOSection("__DWARF", "__debug_aranges",
 207                          MCSectionMachO::S_ATTR_DEBUG,
 208                          SectionKind::getMetadata());
 209   DwarfRangesSection =
 210     Ctx->getMachOSection("__DWARF", "__debug_ranges",
 211                          MCSectionMachO::S_ATTR_DEBUG,
 212                          SectionKind::getMetadata());
 213   DwarfMacroInfoSection =
 214     Ctx->getMachOSection("__DWARF", "__debug_macinfo",
 215                          MCSectionMachO::S_ATTR_DEBUG,
 216                          SectionKind::getMetadata());
 217   DwarfDebugInlineSection =
 218     Ctx->getMachOSection("__DWARF", "__debug_inlined",
 219                          MCSectionMachO::S_ATTR_DEBUG,
 220                          SectionKind::getMetadata());
 221
 222   TLSExtraDataSection = TLSTLVSection;
 223 }
 224
 225 void MCObjectFileInfo::InitELFMCObjectFileInfo(Triple T) {
 226   if (T.getArch() == Triple::x86) {
 227     PersonalityEncoding = (RelocM == Reloc::PIC_)
 228       ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
 229       : dwarf::DW_EH_PE_absptr;
 230     LSDAEncoding = (RelocM == Reloc::PIC_)
 231       ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
 232       : dwarf::DW_EH_PE_absptr;
 233     FDEEncoding = FDECFIEncoding = (RelocM == Reloc::PIC_)
 234       ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
 235       : dwarf::DW_EH_PE_absptr;
 236     TTypeEncoding = (RelocM == Reloc::PIC_)
 237       ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
 238       : dwarf::DW_EH_PE_absptr;
 239   } else if (T.getArch() == Triple::x86_64) {
 240     FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 241
 242     if (RelocM == Reloc::PIC_) {
 243       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 244         ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
 245          ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
 246       LSDAEncoding = dwarf::DW_EH_PE_pcrel |
 247         (CMModel == CodeModel::Small
 248          ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
 249       FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 250       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 251         ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
 252          ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
 253     } else {
 254       PersonalityEncoding =
 255         (CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
 256         ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
 257       LSDAEncoding = (CMModel == CodeModel::Small)
 258         ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
 259       FDEEncoding = dwarf::DW_EH_PE_udata4;
 260       TTypeEncoding = (CMModel == CodeModel::Small)
 261         ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
 262     }
 263   }
 264
 265   // ELF
 266   BSSSection =
 267     Ctx->getELFSection(".bss", ELF::SHT_NOBITS,
 268                        ELF::SHF_WRITE |ELF::SHF_ALLOC,
 269                        SectionKind::getBSS());
 270
 271   TextSection =
 272     Ctx->getELFSection(".text", ELF::SHT_PROGBITS,
 273                        ELF::SHF_EXECINSTR |
 274                        ELF::SHF_ALLOC,
 275                        SectionKind::getText());
 276
 277   DataSection =
 278     Ctx->getELFSection(".data", ELF::SHT_PROGBITS,
 279                        ELF::SHF_WRITE |ELF::SHF_ALLOC,
 280                        SectionKind::getDataRel());
 281
 282   ReadOnlySection =
 283     Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS,
 284                        ELF::SHF_ALLOC,
 285                        SectionKind::getReadOnly());
 286
 287   TLSDataSection =
 288     Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS,
 289                        ELF::SHF_ALLOC | ELF::SHF_TLS |
 290                        ELF::SHF_WRITE,
 291                        SectionKind::getThreadData());
 292
 293   TLSBSSSection =
 294     Ctx->getELFSection(".tbss", ELF::SHT_NOBITS,
 295                        ELF::SHF_ALLOC | ELF::SHF_TLS |
 296                        ELF::SHF_WRITE,
 297                        SectionKind::getThreadBSS());
 298
 299   DataRelSection =
 300     Ctx->getELFSection(".data.rel", ELF::SHT_PROGBITS,
 301                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 302                        SectionKind::getDataRel());
 303
 304   DataRelLocalSection =
 305     Ctx->getELFSection(".data.rel.local", ELF::SHT_PROGBITS,
 306                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 307                        SectionKind::getDataRelLocal());
 308
 309   DataRelROSection =
 310     Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS,
 311                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 312                        SectionKind::getReadOnlyWithRel());
 313
 314   DataRelROLocalSection =
 315     Ctx->getELFSection(".data.rel.ro.local", ELF::SHT_PROGBITS,
 316                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 317                        SectionKind::getReadOnlyWithRelLocal());
 318
 319   MergeableConst4Section =
 320     Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS,
 321                        ELF::SHF_ALLOC |ELF::SHF_MERGE,
 322                        SectionKind::getMergeableConst4());
 323
 324   MergeableConst8Section =
 325     Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS,
 326                        ELF::SHF_ALLOC |ELF::SHF_MERGE,
 327                        SectionKind::getMergeableConst8());
 328
 329   MergeableConst16Section =
 330     Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS,
 331                        ELF::SHF_ALLOC |ELF::SHF_MERGE,
 332                        SectionKind::getMergeableConst16());
 333
 334   StaticCtorSection =
 335     Ctx->getELFSection(".ctors", ELF::SHT_PROGBITS,
 336                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 337                        SectionKind::getDataRel());
 338
 339   StaticDtorSection =
 340     Ctx->getELFSection(".dtors", ELF::SHT_PROGBITS,
 341                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 342                        SectionKind::getDataRel());
 343
 344   // Exception Handling Sections.
 345
 346   // FIXME: We're emitting LSDA info into a readonly section on ELF, even though
 347   // it contains relocatable pointers.  In PIC mode, this is probably a big
 348   // runtime hit for C++ apps.  Either the contents of the LSDA need to be
 349   // adjusted or this should be a data section.
 350   LSDASection =
 351     Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS,
 352                        ELF::SHF_ALLOC,
 353                        SectionKind::getReadOnly());
 354
 355   // Debug Info Sections.
 356   DwarfAbbrevSection =
 357     Ctx->getELFSection(".debug_abbrev", ELF::SHT_PROGBITS, 0,
 358                        SectionKind::getMetadata());
 359   DwarfInfoSection =
 360     Ctx->getELFSection(".debug_info", ELF::SHT_PROGBITS, 0,
 361                        SectionKind::getMetadata());
 362   DwarfLineSection =
 363     Ctx->getELFSection(".debug_line", ELF::SHT_PROGBITS, 0,
 364                        SectionKind::getMetadata());
 365   DwarfFrameSection =
 366     Ctx->getELFSection(".debug_frame", ELF::SHT_PROGBITS, 0,
 367                        SectionKind::getMetadata());
 368   DwarfPubNamesSection =
 369     Ctx->getELFSection(".debug_pubnames", ELF::SHT_PROGBITS, 0,
 370                        SectionKind::getMetadata());
 371   DwarfPubTypesSection =
 372     Ctx->getELFSection(".debug_pubtypes", ELF::SHT_PROGBITS, 0,
 373                        SectionKind::getMetadata());
 374   DwarfStrSection =
 375     Ctx->getELFSection(".debug_str", ELF::SHT_PROGBITS,
 376                        ELF::SHF_MERGE | ELF::SHF_STRINGS,
 377                        SectionKind::getMergeable1ByteCString());
 378   DwarfLocSection =
 379     Ctx->getELFSection(".debug_loc", ELF::SHT_PROGBITS, 0,
 380                        SectionKind::getMetadata());
 381   DwarfARangesSection =
 382     Ctx->getELFSection(".debug_aranges", ELF::SHT_PROGBITS, 0,
 383                        SectionKind::getMetadata());
 384   DwarfRangesSection =
 385     Ctx->getELFSection(".debug_ranges", ELF::SHT_PROGBITS, 0,
 386                        SectionKind::getMetadata());
 387   DwarfMacroInfoSection =
 388     Ctx->getELFSection(".debug_macinfo", ELF::SHT_PROGBITS, 0,
 389                        SectionKind::getMetadata());
 390 }
 391
 392
 393 void MCObjectFileInfo::InitCOFFMCObjectFileInfo(Triple T) {
 394   // COFF
 395   TextSection =
 396     Ctx->getCOFFSection(".text",
 397                         COFF::IMAGE_SCN_CNT_CODE |
 398                         COFF::IMAGE_SCN_MEM_EXECUTE |
 399                         COFF::IMAGE_SCN_MEM_READ,
 400                         SectionKind::getText());
 401   DataSection =
 402     Ctx->getCOFFSection(".data",
 403                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 404                         COFF::IMAGE_SCN_MEM_READ |
 405                         COFF::IMAGE_SCN_MEM_WRITE,
 406                         SectionKind::getDataRel());
 407   ReadOnlySection =
 408     Ctx->getCOFFSection(".rdata",
 409                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 410                         COFF::IMAGE_SCN_MEM_READ,
 411                         SectionKind::getReadOnly());
 412   StaticCtorSection =
 413     Ctx->getCOFFSection(".ctors",
 414                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 415                         COFF::IMAGE_SCN_MEM_READ |
 416                         COFF::IMAGE_SCN_MEM_WRITE,
 417                         SectionKind::getDataRel());
 418   StaticDtorSection =
 419     Ctx->getCOFFSection(".dtors",
 420                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 421                         COFF::IMAGE_SCN_MEM_READ |
 422                         COFF::IMAGE_SCN_MEM_WRITE,
 423                         SectionKind::getDataRel());
 424
 425   // FIXME: We're emitting LSDA info into a readonly section on COFF, even
 426   // though it contains relocatable pointers.  In PIC mode, this is probably a
 427   // big runtime hit for C++ apps.  Either the contents of the LSDA need to be
 428   // adjusted or this should be a data section.
 429   LSDASection =
 430     Ctx->getCOFFSection(".gcc_except_table",
 431                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 432                         COFF::IMAGE_SCN_MEM_READ,
 433                         SectionKind::getReadOnly());
 434
 435   // Debug info.
 436   DwarfAbbrevSection =
 437     Ctx->getCOFFSection(".debug_abbrev",
 438                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 439                         COFF::IMAGE_SCN_MEM_READ,
 440                         SectionKind::getMetadata());
 441   DwarfInfoSection =
 442     Ctx->getCOFFSection(".debug_info",
 443                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 444                         COFF::IMAGE_SCN_MEM_READ,
 445                         SectionKind::getMetadata());
 446   DwarfLineSection =
 447     Ctx->getCOFFSection(".debug_line",
 448                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 449                         COFF::IMAGE_SCN_MEM_READ,
 450                         SectionKind::getMetadata());
 451   DwarfFrameSection =
 452     Ctx->getCOFFSection(".debug_frame",
 453                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 454                         COFF::IMAGE_SCN_MEM_READ,
 455                         SectionKind::getMetadata());
 456   DwarfPubNamesSection =
 457     Ctx->getCOFFSection(".debug_pubnames",
 458                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 459                         COFF::IMAGE_SCN_MEM_READ,
 460                         SectionKind::getMetadata());
 461   DwarfPubTypesSection =
 462     Ctx->getCOFFSection(".debug_pubtypes",
 463                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 464                         COFF::IMAGE_SCN_MEM_READ,
 465                         SectionKind::getMetadata());
 466   DwarfStrSection =
 467     Ctx->getCOFFSection(".debug_str",
 468                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 469                         COFF::IMAGE_SCN_MEM_READ,
 470                         SectionKind::getMetadata());
 471   DwarfLocSection =
 472     Ctx->getCOFFSection(".debug_loc",
 473                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 474                         COFF::IMAGE_SCN_MEM_READ,
 475                         SectionKind::getMetadata());
 476   DwarfARangesSection =
 477     Ctx->getCOFFSection(".debug_aranges",
 478                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 479                         COFF::IMAGE_SCN_MEM_READ,
 480                         SectionKind::getMetadata());
 481   DwarfRangesSection =
 482     Ctx->getCOFFSection(".debug_ranges",
 483                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 484                         COFF::IMAGE_SCN_MEM_READ,
 485                         SectionKind::getMetadata());
 486   DwarfMacroInfoSection =
 487     Ctx->getCOFFSection(".debug_macinfo",
 488                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 489                         COFF::IMAGE_SCN_MEM_READ,
 490                         SectionKind::getMetadata());
 491
 492   DrectveSection =
 493     Ctx->getCOFFSection(".drectve",
 494                         COFF::IMAGE_SCN_LNK_INFO,
 495                         SectionKind::getMetadata());
 496
 497   PDataSection =
 498     Ctx->getCOFFSection(".pdata",
 499                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 500                         COFF::IMAGE_SCN_MEM_READ |
 501                         COFF::IMAGE_SCN_MEM_WRITE,
 502                         SectionKind::getDataRel());
 503
 504   XDataSection =
 505     Ctx->getCOFFSection(".xdata",
 506                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 507                         COFF::IMAGE_SCN_MEM_READ |
 508                         COFF::IMAGE_SCN_MEM_WRITE,
 509                         SectionKind::getDataRel());
 510 }
 511
 512 void MCObjectFileInfo::InitMCObjectFileInfo(StringRef TT, Reloc::Model relocm,
 513                                             CodeModel::Model cm,
 514                                             MCContext &ctx) {
 515   RelocM = relocm;
 516   CMModel = cm;
 517   Ctx = &ctx;
 518
 519   // Common.
 520   CommDirectiveSupportsAlignment = true;
 521   SupportsWeakOmittedEHFrame = true;
 522   IsFunctionEHFrameSymbolPrivate = true;
 523
 524   PersonalityEncoding = LSDAEncoding = FDEEncoding = FDECFIEncoding =
 525     TTypeEncoding = dwarf::DW_EH_PE_absptr;
 526
 527   EHFrameSection = 0;             // Created on demand.
 528   CompactUnwindSection = 0;       // Used only by selected targets.
 529   DwarfAccelNamesSection = 0;     // Used only by selected targets.
 530   DwarfAccelObjCSection = 0;      // Used only by selected targets.
 531   DwarfAccelNamespaceSection = 0; // Used only by selected targets.
 532   DwarfAccelTypesSection = 0;     // Used only by selected targets.
 533
 534   Triple T(TT);
 535   Triple::ArchType Arch = T.getArch();
 536   // FIXME: Checking for Arch here to filter out bogus triples such as
 537   // cellspu-apple-darwin. Perhaps we should fix in Triple?
 538   if ((Arch == Triple::x86 || Arch == Triple::x86_64 ||
 539        Arch == Triple::arm || Arch == Triple::thumb ||
 540        Arch == Triple::ppc || Arch == Triple::ppc64 ||
 541        Arch == Triple::UnknownArch) &&
 542       (T.isOSDarwin() || T.getEnvironment() == Triple::MachO)) {
 543     Env = IsMachO;
 544     InitMachOMCObjectFileInfo(T);
 545   } else if ((Arch == Triple::x86 || Arch == Triple::x86_64) &&
 546              (T.getOS() == Triple::MinGW32 || T.getOS() == Triple::Cygwin ||
 547               T.getOS() == Triple::Win32)) {
 548     Env = IsCOFF;
 549     InitCOFFMCObjectFileInfo(T);
 550   } else {
 551     Env = IsELF;
 552     InitELFMCObjectFileInfo(T);
 553   }
 554 }
 555
 556 void MCObjectFileInfo::InitEHFrameSection() {
 557   if (Env == IsMachO)
 558     EHFrameSection =
 559       Ctx->getMachOSection("__TEXT", "__eh_frame",
 560                            MCSectionMachO::S_COALESCED |
 561                            MCSectionMachO::S_ATTR_NO_TOC |
 562                            MCSectionMachO::S_ATTR_STRIP_STATIC_SYMS |
 563                            MCSectionMachO::S_ATTR_LIVE_SUPPORT,
 564                            SectionKind::getReadOnly());
 565   else if (Env == IsELF)
 566     EHFrameSection =
 567       Ctx->getELFSection(".eh_frame", ELF::SHT_PROGBITS,
 568                          ELF::SHF_ALLOC,
 569                          SectionKind::getDataRel());
 570   else
 571     EHFrameSection =
 572       Ctx->getCOFFSection(".eh_frame",
 573                           COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 574                           COFF::IMAGE_SCN_MEM_READ |
 575                           COFF::IMAGE_SCN_MEM_WRITE,
 576                           SectionKind::getDataRel());
 577 }