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