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/ADT/StringExtras.h"
  13 #include "llvm/MC/MCContext.h"
  14 #include "llvm/MC/MCSection.h"
  15 #include "llvm/MC/MCSectionCOFF.h"
  16 #include "llvm/MC/MCSectionELF.h"
  17 #include "llvm/MC/MCSectionMachO.h"
  18 using namespace llvm;
  19
  20 void MCObjectFileInfo::InitMachOMCObjectFileInfo(Triple T) {
  21   // MachO
  22   IsFunctionEHFrameSymbolPrivate = false;
  23   SupportsWeakOmittedEHFrame = false;
  24
  25   PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel
  26     | dwarf::DW_EH_PE_sdata4;
  27   LSDAEncoding = FDEEncoding = FDECFIEncoding = dwarf::DW_EH_PE_pcrel;
  28   TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
  29     dwarf::DW_EH_PE_sdata4;
  30
  31   // .comm doesn't support alignment before Leopard.
  32   if (T.isMacOSX() && T.isMacOSXVersionLT(10, 5))
  33     CommDirectiveSupportsAlignment = false;
  34
  35   TextSection // .text
  36     = Ctx->getMachOSection("__TEXT", "__text",
  37                            MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
  38                            SectionKind::getText());
  39   DataSection // .data
  40     = Ctx->getMachOSection("__DATA", "__data", 0,
  41                            SectionKind::getDataRel());
  42
  43   // BSSSection might not be expected initialized on msvc.
  44   BSSSection = 0;
  45
  46   TLSDataSection // .tdata
  47     = Ctx->getMachOSection("__DATA", "__thread_data",
  48                            MCSectionMachO::S_THREAD_LOCAL_REGULAR,
  49                            SectionKind::getDataRel());
  50   TLSBSSSection // .tbss
  51     = Ctx->getMachOSection("__DATA", "__thread_bss",
  52                            MCSectionMachO::S_THREAD_LOCAL_ZEROFILL,
  53                            SectionKind::getThreadBSS());
  54
  55   // TODO: Verify datarel below.
  56   TLSTLVSection // .tlv
  57     = Ctx->getMachOSection("__DATA", "__thread_vars",
  58                            MCSectionMachO::S_THREAD_LOCAL_VARIABLES,
  59                            SectionKind::getDataRel());
  60
  61   TLSThreadInitSection
  62     = Ctx->getMachOSection("__DATA", "__thread_init",
  63                           MCSectionMachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS,
  64                           SectionKind::getDataRel());
  65
  66   CStringSection // .cstring
  67     = Ctx->getMachOSection("__TEXT", "__cstring",
  68                            MCSectionMachO::S_CSTRING_LITERALS,
  69                            SectionKind::getMergeable1ByteCString());
  70   UStringSection
  71     = Ctx->getMachOSection("__TEXT","__ustring", 0,
  72                            SectionKind::getMergeable2ByteCString());
  73   FourByteConstantSection // .literal4
  74     = Ctx->getMachOSection("__TEXT", "__literal4",
  75                            MCSectionMachO::S_4BYTE_LITERALS,
  76                            SectionKind::getMergeableConst4());
  77   EightByteConstantSection // .literal8
  78     = Ctx->getMachOSection("__TEXT", "__literal8",
  79                            MCSectionMachO::S_8BYTE_LITERALS,
  80                            SectionKind::getMergeableConst8());
  81
  82   // ld_classic doesn't support .literal16 in 32-bit mode, and ld64 falls back
  83   // to using it in -static mode.
  84   SixteenByteConstantSection = 0;
  85   if (RelocM != Reloc::Static &&
  86       T.getArch() != Triple::x86_64 && T.getArch() != Triple::ppc64 &&
  87       T.getArch() != Triple::ppc64le)
  88     SixteenByteConstantSection =   // .literal16
  89       Ctx->getMachOSection("__TEXT", "__literal16",
  90                            MCSectionMachO::S_16BYTE_LITERALS,
  91                            SectionKind::getMergeableConst16());
  92
  93   ReadOnlySection  // .const
  94     = Ctx->getMachOSection("__TEXT", "__const", 0,
  95                            SectionKind::getReadOnly());
  96
  97   TextCoalSection
  98     = Ctx->getMachOSection("__TEXT", "__textcoal_nt",
  99                            MCSectionMachO::S_COALESCED |
 100                            MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
 101                            SectionKind::getText());
 102   ConstTextCoalSection
 103     = Ctx->getMachOSection("__TEXT", "__const_coal",
 104                            MCSectionMachO::S_COALESCED,
 105                            SectionKind::getReadOnly());
 106   ConstDataSection  // .const_data
 107     = Ctx->getMachOSection("__DATA", "__const", 0,
 108                            SectionKind::getReadOnlyWithRel());
 109   DataCoalSection
 110     = Ctx->getMachOSection("__DATA","__datacoal_nt",
 111                            MCSectionMachO::S_COALESCED,
 112                            SectionKind::getDataRel());
 113   DataCommonSection
 114     = Ctx->getMachOSection("__DATA","__common",
 115                            MCSectionMachO::S_ZEROFILL,
 116                            SectionKind::getBSS());
 117   DataBSSSection
 118     = Ctx->getMachOSection("__DATA","__bss", MCSectionMachO::S_ZEROFILL,
 119                            SectionKind::getBSS());
 120
 121
 122   LazySymbolPointerSection
 123     = Ctx->getMachOSection("__DATA", "__la_symbol_ptr",
 124                            MCSectionMachO::S_LAZY_SYMBOL_POINTERS,
 125                            SectionKind::getMetadata());
 126   NonLazySymbolPointerSection
 127     = Ctx->getMachOSection("__DATA", "__nl_symbol_ptr",
 128                            MCSectionMachO::S_NON_LAZY_SYMBOL_POINTERS,
 129                            SectionKind::getMetadata());
 130
 131   if (RelocM == Reloc::Static) {
 132     StaticCtorSection
 133       = Ctx->getMachOSection("__TEXT", "__constructor", 0,
 134                              SectionKind::getDataRel());
 135     StaticDtorSection
 136       = Ctx->getMachOSection("__TEXT", "__destructor", 0,
 137                              SectionKind::getDataRel());
 138   } else {
 139     StaticCtorSection
 140       = Ctx->getMachOSection("__DATA", "__mod_init_func",
 141                              MCSectionMachO::S_MOD_INIT_FUNC_POINTERS,
 142                              SectionKind::getDataRel());
 143     StaticDtorSection
 144       = Ctx->getMachOSection("__DATA", "__mod_term_func",
 145                              MCSectionMachO::S_MOD_TERM_FUNC_POINTERS,
 146                              SectionKind::getDataRel());
 147   }
 148
 149   // Exception Handling.
 150   LSDASection = Ctx->getMachOSection("__TEXT", "__gcc_except_tab", 0,
 151                                      SectionKind::getReadOnlyWithRel());
 152
 153   if (T.isMacOSX() && !T.isMacOSXVersionLT(10, 6)) {
 154     CompactUnwindSection =
 155       Ctx->getMachOSection("__LD", "__compact_unwind",
 156                            MCSectionMachO::S_ATTR_DEBUG,
 157                            SectionKind::getReadOnly());
 158
 159     if (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86)
 160       CompactUnwindDwarfEHFrameOnly = 0x04000000;
 161   }
 162
 163   // Debug Information.
 164   DwarfAccelNamesSection =
 165     Ctx->getMachOSection("__DWARF", "__apple_names",
 166                          MCSectionMachO::S_ATTR_DEBUG,
 167                          SectionKind::getMetadata());
 168   DwarfAccelObjCSection =
 169     Ctx->getMachOSection("__DWARF", "__apple_objc",
 170                          MCSectionMachO::S_ATTR_DEBUG,
 171                          SectionKind::getMetadata());
 172   // 16 character section limit...
 173   DwarfAccelNamespaceSection =
 174     Ctx->getMachOSection("__DWARF", "__apple_namespac",
 175                          MCSectionMachO::S_ATTR_DEBUG,
 176                          SectionKind::getMetadata());
 177   DwarfAccelTypesSection =
 178     Ctx->getMachOSection("__DWARF", "__apple_types",
 179                          MCSectionMachO::S_ATTR_DEBUG,
 180                          SectionKind::getMetadata());
 181
 182   DwarfAbbrevSection =
 183     Ctx->getMachOSection("__DWARF", "__debug_abbrev",
 184                          MCSectionMachO::S_ATTR_DEBUG,
 185                          SectionKind::getMetadata());
 186   DwarfInfoSection =
 187     Ctx->getMachOSection("__DWARF", "__debug_info",
 188                          MCSectionMachO::S_ATTR_DEBUG,
 189                          SectionKind::getMetadata());
 190   DwarfLineSection =
 191     Ctx->getMachOSection("__DWARF", "__debug_line",
 192                          MCSectionMachO::S_ATTR_DEBUG,
 193                          SectionKind::getMetadata());
 194   DwarfFrameSection =
 195     Ctx->getMachOSection("__DWARF", "__debug_frame",
 196                          MCSectionMachO::S_ATTR_DEBUG,
 197                          SectionKind::getMetadata());
 198   DwarfPubNamesSection =
 199     Ctx->getMachOSection("__DWARF", "__debug_pubnames",
 200                          MCSectionMachO::S_ATTR_DEBUG,
 201                          SectionKind::getMetadata());
 202   DwarfPubTypesSection =
 203     Ctx->getMachOSection("__DWARF", "__debug_pubtypes",
 204                          MCSectionMachO::S_ATTR_DEBUG,
 205                          SectionKind::getMetadata());
 206   DwarfGnuPubNamesSection =
 207     Ctx->getMachOSection("__DWARF", "__debug_gnu_pubn",
 208                          MCSectionMachO::S_ATTR_DEBUG,
 209                          SectionKind::getMetadata());
 210   DwarfGnuPubTypesSection =
 211     Ctx->getMachOSection("__DWARF", "__debug_gnu_pubt",
 212                          MCSectionMachO::S_ATTR_DEBUG,
 213                          SectionKind::getMetadata());
 214   DwarfStrSection =
 215     Ctx->getMachOSection("__DWARF", "__debug_str",
 216                          MCSectionMachO::S_ATTR_DEBUG,
 217                          SectionKind::getMetadata());
 218   DwarfLocSection =
 219     Ctx->getMachOSection("__DWARF", "__debug_loc",
 220                          MCSectionMachO::S_ATTR_DEBUG,
 221                          SectionKind::getMetadata());
 222   DwarfARangesSection =
 223     Ctx->getMachOSection("__DWARF", "__debug_aranges",
 224                          MCSectionMachO::S_ATTR_DEBUG,
 225                          SectionKind::getMetadata());
 226   DwarfRangesSection =
 227     Ctx->getMachOSection("__DWARF", "__debug_ranges",
 228                          MCSectionMachO::S_ATTR_DEBUG,
 229                          SectionKind::getMetadata());
 230   DwarfMacroInfoSection =
 231     Ctx->getMachOSection("__DWARF", "__debug_macinfo",
 232                          MCSectionMachO::S_ATTR_DEBUG,
 233                          SectionKind::getMetadata());
 234   DwarfDebugInlineSection =
 235     Ctx->getMachOSection("__DWARF", "__debug_inlined",
 236                          MCSectionMachO::S_ATTR_DEBUG,
 237                          SectionKind::getMetadata());
 238   StackMapSection =
 239     Ctx->getMachOSection("__LLVM_STACKMAPS", "__llvm_stackmaps", 0,
 240                          SectionKind::getMetadata());
 241
 242   TLSExtraDataSection = TLSTLVSection;
 243 }
 244
 245 void MCObjectFileInfo::InitELFMCObjectFileInfo(Triple T) {
 246   if (T.getArch() == Triple::mips ||
 247       T.getArch() == Triple::mipsel)
 248     FDECFIEncoding = dwarf::DW_EH_PE_sdata4;
 249   else if (T.getArch() == Triple::mips64 ||
 250            T.getArch() == Triple::mips64el)
 251     FDECFIEncoding = dwarf::DW_EH_PE_sdata8;
 252   else
 253     FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 254
 255   if (T.getArch() == Triple::x86) {
 256     PersonalityEncoding = (RelocM == Reloc::PIC_)
 257      ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
 258      : dwarf::DW_EH_PE_absptr;
 259     LSDAEncoding = (RelocM == Reloc::PIC_)
 260       ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
 261       : dwarf::DW_EH_PE_absptr;
 262     FDEEncoding = (RelocM == Reloc::PIC_)
 263       ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
 264       : dwarf::DW_EH_PE_absptr;
 265     TTypeEncoding = (RelocM == Reloc::PIC_)
 266      ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
 267      : dwarf::DW_EH_PE_absptr;
 268   } else if (T.getArch() == Triple::x86_64) {
 269     if (RelocM == Reloc::PIC_) {
 270       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 271         ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
 272          ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
 273       LSDAEncoding = dwarf::DW_EH_PE_pcrel |
 274         (CMModel == CodeModel::Small
 275          ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
 276       FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 277       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 278         ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
 279          ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
 280     } else {
 281       PersonalityEncoding =
 282         (CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
 283         ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
 284       LSDAEncoding = (CMModel == CodeModel::Small)
 285         ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
 286       FDEEncoding = dwarf::DW_EH_PE_udata4;
 287       TTypeEncoding = (CMModel == CodeModel::Small)
 288         ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
 289     }
 290   }  else if (T.getArch() ==  Triple::aarch64) {
 291     // The small model guarantees static code/data size < 4GB, but not where it
 292     // will be in memory. Most of these could end up >2GB away so even a signed
 293     // pc-relative 32-bit address is insufficient, theoretically.
 294     if (RelocM == Reloc::PIC_) {
 295       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 296         dwarf::DW_EH_PE_sdata8;
 297       LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8;
 298       FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 299       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 300         dwarf::DW_EH_PE_sdata8;
 301     } else {
 302       PersonalityEncoding = dwarf::DW_EH_PE_absptr;
 303       LSDAEncoding = dwarf::DW_EH_PE_absptr;
 304       FDEEncoding = dwarf::DW_EH_PE_udata4;
 305       TTypeEncoding = dwarf::DW_EH_PE_absptr;
 306     }
 307   } else if (T.getArch() == Triple::ppc64 || T.getArch() == Triple::ppc64le) {
 308     PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 309       dwarf::DW_EH_PE_udata8;
 310     LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
 311     FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
 312     TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 313       dwarf::DW_EH_PE_udata8;
 314   } else if (T.getArch() == Triple::systemz) {
 315     // All currently-defined code models guarantee that 4-byte PC-relative
 316     // values will be in range.
 317     if (RelocM == Reloc::PIC_) {
 318       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 319         dwarf::DW_EH_PE_sdata4;
 320       LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 321       FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 322       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 323         dwarf::DW_EH_PE_sdata4;
 324     } else {
 325       PersonalityEncoding = dwarf::DW_EH_PE_absptr;
 326       LSDAEncoding = dwarf::DW_EH_PE_absptr;
 327       FDEEncoding = dwarf::DW_EH_PE_absptr;
 328       TTypeEncoding = dwarf::DW_EH_PE_absptr;
 329     }
 330   }
 331
 332   // Solaris requires different flags for .eh_frame to seemingly every other
 333   // platform.
 334   EHSectionType = ELF::SHT_PROGBITS;
 335   EHSectionFlags = ELF::SHF_ALLOC;
 336   if (T.getOS() == Triple::Solaris) {
 337     if (T.getArch() == Triple::x86_64)
 338       EHSectionType = ELF::SHT_X86_64_UNWIND;
 339     else
 340       EHSectionFlags |= ELF::SHF_WRITE;
 341   }
 342
 343
 344   // ELF
 345   BSSSection =
 346     Ctx->getELFSection(".bss", ELF::SHT_NOBITS,
 347                        ELF::SHF_WRITE | ELF::SHF_ALLOC,
 348                        SectionKind::getBSS());
 349
 350   TextSection =
 351     Ctx->getELFSection(".text", ELF::SHT_PROGBITS,
 352                        ELF::SHF_EXECINSTR |
 353                        ELF::SHF_ALLOC,
 354                        SectionKind::getText());
 355
 356   DataSection =
 357     Ctx->getELFSection(".data", ELF::SHT_PROGBITS,
 358                        ELF::SHF_WRITE |ELF::SHF_ALLOC,
 359                        SectionKind::getDataRel());
 360
 361   ReadOnlySection =
 362     Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS,
 363                        ELF::SHF_ALLOC,
 364                        SectionKind::getReadOnly());
 365
 366   TLSDataSection =
 367     Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS,
 368                        ELF::SHF_ALLOC | ELF::SHF_TLS |
 369                        ELF::SHF_WRITE,
 370                        SectionKind::getThreadData());
 371
 372   TLSBSSSection =
 373     Ctx->getELFSection(".tbss", ELF::SHT_NOBITS,
 374                        ELF::SHF_ALLOC | ELF::SHF_TLS |
 375                        ELF::SHF_WRITE,
 376                        SectionKind::getThreadBSS());
 377
 378   DataRelSection =
 379     Ctx->getELFSection(".data.rel", ELF::SHT_PROGBITS,
 380                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 381                        SectionKind::getDataRel());
 382
 383   DataRelLocalSection =
 384     Ctx->getELFSection(".data.rel.local", ELF::SHT_PROGBITS,
 385                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 386                        SectionKind::getDataRelLocal());
 387
 388   DataRelROSection =
 389     Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS,
 390                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 391                        SectionKind::getReadOnlyWithRel());
 392
 393   DataRelROLocalSection =
 394     Ctx->getELFSection(".data.rel.ro.local", ELF::SHT_PROGBITS,
 395                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 396                        SectionKind::getReadOnlyWithRelLocal());
 397
 398   MergeableConst4Section =
 399     Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS,
 400                        ELF::SHF_ALLOC |ELF::SHF_MERGE,
 401                        SectionKind::getMergeableConst4());
 402
 403   MergeableConst8Section =
 404     Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS,
 405                        ELF::SHF_ALLOC |ELF::SHF_MERGE,
 406                        SectionKind::getMergeableConst8());
 407
 408   MergeableConst16Section =
 409     Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS,
 410                        ELF::SHF_ALLOC |ELF::SHF_MERGE,
 411                        SectionKind::getMergeableConst16());
 412
 413   StaticCtorSection =
 414     Ctx->getELFSection(".ctors", ELF::SHT_PROGBITS,
 415                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 416                        SectionKind::getDataRel());
 417
 418   StaticDtorSection =
 419     Ctx->getELFSection(".dtors", ELF::SHT_PROGBITS,
 420                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 421                        SectionKind::getDataRel());
 422
 423   // Exception Handling Sections.
 424
 425   // FIXME: We're emitting LSDA info into a readonly section on ELF, even though
 426   // it contains relocatable pointers.  In PIC mode, this is probably a big
 427   // 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->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS,
 431                        ELF::SHF_ALLOC,
 432                        SectionKind::getReadOnly());
 433
 434   // Debug Info Sections.
 435   DwarfAbbrevSection =
 436     Ctx->getELFSection(".debug_abbrev", ELF::SHT_PROGBITS, 0,
 437                        SectionKind::getMetadata());
 438   DwarfInfoSection =
 439     Ctx->getELFSection(".debug_info", ELF::SHT_PROGBITS, 0,
 440                        SectionKind::getMetadata());
 441   DwarfLineSection =
 442     Ctx->getELFSection(".debug_line", ELF::SHT_PROGBITS, 0,
 443                        SectionKind::getMetadata());
 444   DwarfFrameSection =
 445     Ctx->getELFSection(".debug_frame", ELF::SHT_PROGBITS, 0,
 446                        SectionKind::getMetadata());
 447   DwarfPubNamesSection =
 448     Ctx->getELFSection(".debug_pubnames", ELF::SHT_PROGBITS, 0,
 449                        SectionKind::getMetadata());
 450   DwarfPubTypesSection =
 451     Ctx->getELFSection(".debug_pubtypes", ELF::SHT_PROGBITS, 0,
 452                        SectionKind::getMetadata());
 453   DwarfGnuPubNamesSection =
 454     Ctx->getELFSection(".debug_gnu_pubnames", ELF::SHT_PROGBITS, 0,
 455                        SectionKind::getMetadata());
 456   DwarfGnuPubTypesSection =
 457     Ctx->getELFSection(".debug_gnu_pubtypes", ELF::SHT_PROGBITS, 0,
 458                        SectionKind::getMetadata());
 459   DwarfStrSection =
 460     Ctx->getELFSection(".debug_str", ELF::SHT_PROGBITS,
 461                        ELF::SHF_MERGE | ELF::SHF_STRINGS,
 462                        SectionKind::getMergeable1ByteCString());
 463   DwarfLocSection =
 464     Ctx->getELFSection(".debug_loc", ELF::SHT_PROGBITS, 0,
 465                        SectionKind::getMetadata());
 466   DwarfARangesSection =
 467     Ctx->getELFSection(".debug_aranges", ELF::SHT_PROGBITS, 0,
 468                        SectionKind::getMetadata());
 469   DwarfRangesSection =
 470     Ctx->getELFSection(".debug_ranges", ELF::SHT_PROGBITS, 0,
 471                        SectionKind::getMetadata());
 472   DwarfMacroInfoSection =
 473     Ctx->getELFSection(".debug_macinfo", ELF::SHT_PROGBITS, 0,
 474                        SectionKind::getMetadata());
 475
 476   // DWARF5 Experimental Debug Info
 477
 478   // Accelerator Tables
 479   DwarfAccelNamesSection =
 480     Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0,
 481                        SectionKind::getMetadata());
 482   DwarfAccelObjCSection =
 483     Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0,
 484                        SectionKind::getMetadata());
 485   DwarfAccelNamespaceSection =
 486     Ctx->getELFSection(".apple_namespaces", ELF::SHT_PROGBITS, 0,
 487                        SectionKind::getMetadata());
 488   DwarfAccelTypesSection =
 489     Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0,
 490                        SectionKind::getMetadata());
 491
 492   // Fission Sections
 493   DwarfInfoDWOSection =
 494     Ctx->getELFSection(".debug_info.dwo", ELF::SHT_PROGBITS, 0,
 495                        SectionKind::getMetadata());
 496   DwarfAbbrevDWOSection =
 497     Ctx->getELFSection(".debug_abbrev.dwo", ELF::SHT_PROGBITS, 0,
 498                        SectionKind::getMetadata());
 499   DwarfStrDWOSection =
 500     Ctx->getELFSection(".debug_str.dwo", ELF::SHT_PROGBITS,
 501                        ELF::SHF_MERGE | ELF::SHF_STRINGS,
 502                        SectionKind::getMergeable1ByteCString());
 503   DwarfLineDWOSection =
 504     Ctx->getELFSection(".debug_line.dwo", ELF::SHT_PROGBITS, 0,
 505                        SectionKind::getMetadata());
 506   DwarfLocDWOSection =
 507     Ctx->getELFSection(".debug_loc.dwo", ELF::SHT_PROGBITS, 0,
 508                        SectionKind::getMetadata());
 509   DwarfStrOffDWOSection =
 510     Ctx->getELFSection(".debug_str_offsets.dwo", ELF::SHT_PROGBITS, 0,
 511                        SectionKind::getMetadata());
 512   DwarfAddrSection =
 513     Ctx->getELFSection(".debug_addr", ELF::SHT_PROGBITS, 0,
 514                        SectionKind::getMetadata());
 515 }
 516
 517
 518 void MCObjectFileInfo::InitCOFFMCObjectFileInfo(Triple T) {
 519   // COFF
 520   BSSSection =
 521     Ctx->getCOFFSection(".bss",
 522                         COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA |
 523                         COFF::IMAGE_SCN_MEM_READ |
 524                         COFF::IMAGE_SCN_MEM_WRITE,
 525                         SectionKind::getBSS());
 526   TextSection =
 527     Ctx->getCOFFSection(".text",
 528                         COFF::IMAGE_SCN_CNT_CODE |
 529                         COFF::IMAGE_SCN_MEM_EXECUTE |
 530                         COFF::IMAGE_SCN_MEM_READ,
 531                         SectionKind::getText());
 532   DataSection =
 533     Ctx->getCOFFSection(".data",
 534                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 535                         COFF::IMAGE_SCN_MEM_READ |
 536                         COFF::IMAGE_SCN_MEM_WRITE,
 537                         SectionKind::getDataRel());
 538   ReadOnlySection =
 539     Ctx->getCOFFSection(".rdata",
 540                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 541                         COFF::IMAGE_SCN_MEM_READ,
 542                         SectionKind::getReadOnly());
 543   if (T.getOS() == Triple::Win32) {
 544     StaticCtorSection =
 545       Ctx->getCOFFSection(".CRT$XCU",
 546                           COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 547                           COFF::IMAGE_SCN_MEM_READ,
 548                           SectionKind::getReadOnly());
 549   } else {
 550     StaticCtorSection =
 551       Ctx->getCOFFSection(".ctors",
 552                           COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 553                           COFF::IMAGE_SCN_MEM_READ |
 554                           COFF::IMAGE_SCN_MEM_WRITE,
 555                           SectionKind::getDataRel());
 556   }
 557
 558
 559   if (T.getOS() == Triple::Win32) {
 560     StaticDtorSection =
 561       Ctx->getCOFFSection(".CRT$XTX",
 562                           COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 563                           COFF::IMAGE_SCN_MEM_READ,
 564                           SectionKind::getReadOnly());
 565   } else {
 566     StaticDtorSection =
 567       Ctx->getCOFFSection(".dtors",
 568                           COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 569                           COFF::IMAGE_SCN_MEM_READ |
 570                           COFF::IMAGE_SCN_MEM_WRITE,
 571                           SectionKind::getDataRel());
 572   }
 573
 574   // FIXME: We're emitting LSDA info into a readonly section on COFF, even
 575   // though it contains relocatable pointers.  In PIC mode, this is probably a
 576   // big runtime hit for C++ apps.  Either the contents of the LSDA need to be
 577   // adjusted or this should be a data section.
 578   LSDASection =
 579     Ctx->getCOFFSection(".gcc_except_table",
 580                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 581                         COFF::IMAGE_SCN_MEM_READ,
 582                         SectionKind::getReadOnly());
 583
 584   // Debug info.
 585   DwarfAbbrevSection =
 586     Ctx->getCOFFSection(".debug_abbrev",
 587                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 588                         COFF::IMAGE_SCN_MEM_READ,
 589                         SectionKind::getMetadata());
 590   DwarfInfoSection =
 591     Ctx->getCOFFSection(".debug_info",
 592                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 593                         COFF::IMAGE_SCN_MEM_READ,
 594                         SectionKind::getMetadata());
 595   DwarfLineSection =
 596     Ctx->getCOFFSection(".debug_line",
 597                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 598                         COFF::IMAGE_SCN_MEM_READ,
 599                         SectionKind::getMetadata());
 600   DwarfFrameSection =
 601     Ctx->getCOFFSection(".debug_frame",
 602                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 603                         COFF::IMAGE_SCN_MEM_READ,
 604                         SectionKind::getMetadata());
 605   DwarfPubNamesSection =
 606     Ctx->getCOFFSection(".debug_pubnames",
 607                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 608                         COFF::IMAGE_SCN_MEM_READ,
 609                         SectionKind::getMetadata());
 610   DwarfPubTypesSection =
 611     Ctx->getCOFFSection(".debug_pubtypes",
 612                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 613                         COFF::IMAGE_SCN_MEM_READ,
 614                         SectionKind::getMetadata());
 615   DwarfGnuPubNamesSection =
 616     Ctx->getCOFFSection(".debug_gnu_pubnames",
 617                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 618                         COFF::IMAGE_SCN_MEM_READ,
 619                         SectionKind::getMetadata());
 620   DwarfGnuPubTypesSection =
 621     Ctx->getCOFFSection(".debug_gnu_pubtypes",
 622                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 623                         COFF::IMAGE_SCN_MEM_READ,
 624                         SectionKind::getMetadata());
 625   DwarfStrSection =
 626     Ctx->getCOFFSection(".debug_str",
 627                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 628                         COFF::IMAGE_SCN_MEM_READ,
 629                         SectionKind::getMetadata());
 630   DwarfLocSection =
 631     Ctx->getCOFFSection(".debug_loc",
 632                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 633                         COFF::IMAGE_SCN_MEM_READ,
 634                         SectionKind::getMetadata());
 635   DwarfARangesSection =
 636     Ctx->getCOFFSection(".debug_aranges",
 637                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 638                         COFF::IMAGE_SCN_MEM_READ,
 639                         SectionKind::getMetadata());
 640   DwarfRangesSection =
 641     Ctx->getCOFFSection(".debug_ranges",
 642                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 643                         COFF::IMAGE_SCN_MEM_READ,
 644                         SectionKind::getMetadata());
 645   DwarfMacroInfoSection =
 646     Ctx->getCOFFSection(".debug_macinfo",
 647                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 648                         COFF::IMAGE_SCN_MEM_READ,
 649                         SectionKind::getMetadata());
 650
 651   DrectveSection =
 652     Ctx->getCOFFSection(".drectve",
 653                         COFF::IMAGE_SCN_LNK_INFO,
 654                         SectionKind::getMetadata());
 655
 656   PDataSection =
 657     Ctx->getCOFFSection(".pdata",
 658                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 659                         COFF::IMAGE_SCN_MEM_READ,
 660                         SectionKind::getDataRel());
 661
 662   XDataSection =
 663     Ctx->getCOFFSection(".xdata",
 664                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 665                         COFF::IMAGE_SCN_MEM_READ,
 666                         SectionKind::getDataRel());
 667   TLSDataSection =
 668     Ctx->getCOFFSection(".tls$",
 669                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 670                         COFF::IMAGE_SCN_MEM_READ |
 671                         COFF::IMAGE_SCN_MEM_WRITE,
 672                         SectionKind::getDataRel());
 673 }
 674
 675 void MCObjectFileInfo::InitMCObjectFileInfo(StringRef TT, Reloc::Model relocm,
 676                                             CodeModel::Model cm,
 677                                             MCContext &ctx) {
 678   RelocM = relocm;
 679   CMModel = cm;
 680   Ctx = &ctx;
 681
 682   // Common.
 683   CommDirectiveSupportsAlignment = true;
 684   SupportsWeakOmittedEHFrame = true;
 685   IsFunctionEHFrameSymbolPrivate = true;
 686
 687   PersonalityEncoding = LSDAEncoding = FDEEncoding = FDECFIEncoding =
 688     TTypeEncoding = dwarf::DW_EH_PE_absptr;
 689
 690   CompactUnwindDwarfEHFrameOnly = 0;
 691
 692   EHFrameSection = 0;             // Created on demand.
 693   CompactUnwindSection = 0;       // Used only by selected targets.
 694   DwarfAccelNamesSection = 0;     // Used only by selected targets.
 695   DwarfAccelObjCSection = 0;      // Used only by selected targets.
 696   DwarfAccelNamespaceSection = 0; // Used only by selected targets.
 697   DwarfAccelTypesSection = 0;     // Used only by selected targets.
 698
 699   Triple T(TT);
 700   Triple::ArchType Arch = T.getArch();
 701   // FIXME: Checking for Arch here to filter out bogus triples such as
 702   // cellspu-apple-darwin. Perhaps we should fix in Triple?
 703   if ((Arch == Triple::x86 || Arch == Triple::x86_64 ||
 704        Arch == Triple::arm || Arch == Triple::thumb ||
 705        Arch == Triple::ppc || Arch == Triple::ppc64 ||
 706        Arch == Triple::UnknownArch) &&
 707       (T.isOSDarwin() || T.getEnvironment() == Triple::MachO)) {
 708     Env = IsMachO;
 709     InitMachOMCObjectFileInfo(T);
 710   } else if ((Arch == Triple::x86 || Arch == Triple::x86_64) &&
 711              (T.getEnvironment() != Triple::ELF) &&
 712              (T.getOS() == Triple::MinGW32 || T.getOS() == Triple::Cygwin ||
 713               T.getOS() == Triple::Win32)) {
 714     Env = IsCOFF;
 715     InitCOFFMCObjectFileInfo(T);
 716   } else {
 717     Env = IsELF;
 718     InitELFMCObjectFileInfo(T);
 719   }
 720 }
 721
 722 const MCSection *MCObjectFileInfo::getDwarfTypesSection(uint64_t Hash) const {
 723   return Ctx->getELFSection(".debug_types", ELF::SHT_PROGBITS, ELF::SHF_GROUP,
 724                             SectionKind::getMetadata(), 0, utostr(Hash));
 725 }
 726
 727 const MCSection *
 728 MCObjectFileInfo::getDwarfTypesDWOSection(uint64_t Hash) const {
 729   return Ctx->getELFSection(".debug_types.dwo", ELF::SHT_GROUP, 0,
 730                             SectionKind::getMetadata(), 0, utostr(Hash));
 731 }
 732
 733 void MCObjectFileInfo::InitEHFrameSection() {
 734   if (Env == IsMachO)
 735     EHFrameSection =
 736       Ctx->getMachOSection("__TEXT", "__eh_frame",
 737                            MCSectionMachO::S_COALESCED |
 738                            MCSectionMachO::S_ATTR_NO_TOC |
 739                            MCSectionMachO::S_ATTR_STRIP_STATIC_SYMS |
 740                            MCSectionMachO::S_ATTR_LIVE_SUPPORT,
 741                            SectionKind::getReadOnly());
 742   else if (Env == IsELF)
 743     EHFrameSection =
 744       Ctx->getELFSection(".eh_frame", EHSectionType,
 745                          EHSectionFlags,
 746                          SectionKind::getDataRel());
 747   else
 748     EHFrameSection =
 749       Ctx->getCOFFSection(".eh_frame",
 750                           COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 751                           COFF::IMAGE_SCN_MEM_READ |
 752                           COFF::IMAGE_SCN_MEM_WRITE,
 753                           SectionKind::getDataRel());
 754 }