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