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     if (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86)
 155       CompactUnwindDwarfEHFrameOnly = 0x04000000;
 156   }
 157
 158   // Debug Information.
 159   DwarfAccelNamesSection =
 160     Ctx->getMachOSection("__DWARF", "__apple_names",
 161                          MCSectionMachO::S_ATTR_DEBUG,
 162                          SectionKind::getMetadata());
 163   DwarfAccelObjCSection =
 164     Ctx->getMachOSection("__DWARF", "__apple_objc",
 165                          MCSectionMachO::S_ATTR_DEBUG,
 166                          SectionKind::getMetadata());
 167   // 16 character section limit...
 168   DwarfAccelNamespaceSection =
 169     Ctx->getMachOSection("__DWARF", "__apple_namespac",
 170                          MCSectionMachO::S_ATTR_DEBUG,
 171                          SectionKind::getMetadata());
 172   DwarfAccelTypesSection =
 173     Ctx->getMachOSection("__DWARF", "__apple_types",
 174                          MCSectionMachO::S_ATTR_DEBUG,
 175                          SectionKind::getMetadata());
 176
 177   DwarfAbbrevSection =
 178     Ctx->getMachOSection("__DWARF", "__debug_abbrev",
 179                          MCSectionMachO::S_ATTR_DEBUG,
 180                          SectionKind::getMetadata());
 181   DwarfInfoSection =
 182     Ctx->getMachOSection("__DWARF", "__debug_info",
 183                          MCSectionMachO::S_ATTR_DEBUG,
 184                          SectionKind::getMetadata());
 185   DwarfLineSection =
 186     Ctx->getMachOSection("__DWARF", "__debug_line",
 187                          MCSectionMachO::S_ATTR_DEBUG,
 188                          SectionKind::getMetadata());
 189   DwarfFrameSection =
 190     Ctx->getMachOSection("__DWARF", "__debug_frame",
 191                          MCSectionMachO::S_ATTR_DEBUG,
 192                          SectionKind::getMetadata());
 193   DwarfPubNamesSection =
 194     Ctx->getMachOSection("__DWARF", "__debug_pubnames",
 195                          MCSectionMachO::S_ATTR_DEBUG,
 196                          SectionKind::getMetadata());
 197   DwarfPubTypesSection =
 198     Ctx->getMachOSection("__DWARF", "__debug_pubtypes",
 199                          MCSectionMachO::S_ATTR_DEBUG,
 200                          SectionKind::getMetadata());
 201   DwarfStrSection =
 202     Ctx->getMachOSection("__DWARF", "__debug_str",
 203                          MCSectionMachO::S_ATTR_DEBUG,
 204                          SectionKind::getMetadata());
 205   DwarfLocSection =
 206     Ctx->getMachOSection("__DWARF", "__debug_loc",
 207                          MCSectionMachO::S_ATTR_DEBUG,
 208                          SectionKind::getMetadata());
 209   DwarfARangesSection =
 210     Ctx->getMachOSection("__DWARF", "__debug_aranges",
 211                          MCSectionMachO::S_ATTR_DEBUG,
 212                          SectionKind::getMetadata());
 213   DwarfRangesSection =
 214     Ctx->getMachOSection("__DWARF", "__debug_ranges",
 215                          MCSectionMachO::S_ATTR_DEBUG,
 216                          SectionKind::getMetadata());
 217   DwarfMacroInfoSection =
 218     Ctx->getMachOSection("__DWARF", "__debug_macinfo",
 219                          MCSectionMachO::S_ATTR_DEBUG,
 220                          SectionKind::getMetadata());
 221   DwarfDebugInlineSection =
 222     Ctx->getMachOSection("__DWARF", "__debug_inlined",
 223                          MCSectionMachO::S_ATTR_DEBUG,
 224                          SectionKind::getMetadata());
 225
 226   TLSExtraDataSection = TLSTLVSection;
 227 }
 228
 229 void MCObjectFileInfo::InitELFMCObjectFileInfo(Triple T) {
 230   if (T.getArch() == Triple::mips ||
 231       T.getArch() == Triple::mipsel)
 232     FDECFIEncoding = dwarf::DW_EH_PE_sdata4;
 233   else if (T.getArch() == Triple::mips64 ||
 234            T.getArch() == Triple::mips64el)
 235     FDECFIEncoding = dwarf::DW_EH_PE_sdata8;
 236   else
 237     FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 238
 239   if (T.getArch() == Triple::x86) {
 240     PersonalityEncoding = (RelocM == Reloc::PIC_)
 241      ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
 242      : dwarf::DW_EH_PE_absptr;
 243     LSDAEncoding = (RelocM == Reloc::PIC_)
 244       ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
 245       : dwarf::DW_EH_PE_absptr;
 246     FDEEncoding = (RelocM == Reloc::PIC_)
 247       ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
 248       : dwarf::DW_EH_PE_absptr;
 249     TTypeEncoding = (RelocM == Reloc::PIC_)
 250      ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
 251      : dwarf::DW_EH_PE_absptr;
 252   } else if (T.getArch() == Triple::x86_64) {
 253     if (RelocM == Reloc::PIC_) {
 254       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 255         ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
 256          ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
 257       LSDAEncoding = dwarf::DW_EH_PE_pcrel |
 258         (CMModel == CodeModel::Small
 259          ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
 260       FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 261       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 262         ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
 263          ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
 264     } else {
 265       PersonalityEncoding =
 266         (CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
 267         ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
 268       LSDAEncoding = (CMModel == CodeModel::Small)
 269         ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
 270       FDEEncoding = dwarf::DW_EH_PE_udata4;
 271       TTypeEncoding = (CMModel == CodeModel::Small)
 272         ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
 273     }
 274   }  else if (T.getArch() ==  Triple::aarch64) {
 275     // The small model guarantees static code/data size < 4GB, but not where it
 276     // will be in memory. Most of these could end up >2GB away so even a signed
 277     // pc-relative 32-bit address is insufficient, theoretically.
 278     if (RelocM == Reloc::PIC_) {
 279       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 280         dwarf::DW_EH_PE_sdata8;
 281       LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8;
 282       FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 283       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 284         dwarf::DW_EH_PE_sdata8;
 285     } else {
 286       PersonalityEncoding = dwarf::DW_EH_PE_absptr;
 287       LSDAEncoding = dwarf::DW_EH_PE_absptr;
 288       FDEEncoding = dwarf::DW_EH_PE_udata4;
 289       TTypeEncoding = dwarf::DW_EH_PE_absptr;
 290     }
 291   } else if (T.getArch() == Triple::ppc64) {
 292     PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 293       dwarf::DW_EH_PE_udata8;
 294     LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
 295     FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
 296     TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 297       dwarf::DW_EH_PE_udata8;
 298   } else if (T.getArch() == Triple::systemz) {
 299     // All currently-defined code models guarantee that 4-byte PC-relative
 300     // values will be in range.
 301     if (RelocM == Reloc::PIC_) {
 302       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 303         dwarf::DW_EH_PE_sdata4;
 304       LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 305       FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 306       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 307         dwarf::DW_EH_PE_sdata4;
 308     } else {
 309       PersonalityEncoding = dwarf::DW_EH_PE_absptr;
 310       LSDAEncoding = dwarf::DW_EH_PE_absptr;
 311       FDEEncoding = dwarf::DW_EH_PE_absptr;
 312       TTypeEncoding = dwarf::DW_EH_PE_absptr;
 313     }
 314   }
 315
 316   // Solaris requires different flags for .eh_frame to seemingly every other
 317   // platform.
 318   EHSectionType = ELF::SHT_PROGBITS;
 319   EHSectionFlags = ELF::SHF_ALLOC;
 320   if (T.getOS() == Triple::Solaris) {
 321     if (T.getArch() == Triple::x86_64)
 322       EHSectionType = ELF::SHT_X86_64_UNWIND;
 323     else
 324       EHSectionFlags |= ELF::SHF_WRITE;
 325   }
 326
 327
 328   // ELF
 329   BSSSection =
 330     Ctx->getELFSection(".bss", ELF::SHT_NOBITS,
 331                        ELF::SHF_WRITE | ELF::SHF_ALLOC,
 332                        SectionKind::getBSS());
 333
 334   TextSection =
 335     Ctx->getELFSection(".text", ELF::SHT_PROGBITS,
 336                        ELF::SHF_EXECINSTR |
 337                        ELF::SHF_ALLOC,
 338                        SectionKind::getText());
 339
 340   DataSection =
 341     Ctx->getELFSection(".data", ELF::SHT_PROGBITS,
 342                        ELF::SHF_WRITE |ELF::SHF_ALLOC,
 343                        SectionKind::getDataRel());
 344
 345   ReadOnlySection =
 346     Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS,
 347                        ELF::SHF_ALLOC,
 348                        SectionKind::getReadOnly());
 349
 350   TLSDataSection =
 351     Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS,
 352                        ELF::SHF_ALLOC | ELF::SHF_TLS |
 353                        ELF::SHF_WRITE,
 354                        SectionKind::getThreadData());
 355
 356   TLSBSSSection =
 357     Ctx->getELFSection(".tbss", ELF::SHT_NOBITS,
 358                        ELF::SHF_ALLOC | ELF::SHF_TLS |
 359                        ELF::SHF_WRITE,
 360                        SectionKind::getThreadBSS());
 361
 362   DataRelSection =
 363     Ctx->getELFSection(".data.rel", ELF::SHT_PROGBITS,
 364                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 365                        SectionKind::getDataRel());
 366
 367   DataRelLocalSection =
 368     Ctx->getELFSection(".data.rel.local", ELF::SHT_PROGBITS,
 369                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 370                        SectionKind::getDataRelLocal());
 371
 372   DataRelROSection =
 373     Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS,
 374                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 375                        SectionKind::getReadOnlyWithRel());
 376
 377   DataRelROLocalSection =
 378     Ctx->getELFSection(".data.rel.ro.local", ELF::SHT_PROGBITS,
 379                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 380                        SectionKind::getReadOnlyWithRelLocal());
 381
 382   MergeableConst4Section =
 383     Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS,
 384                        ELF::SHF_ALLOC |ELF::SHF_MERGE,
 385                        SectionKind::getMergeableConst4());
 386
 387   MergeableConst8Section =
 388     Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS,
 389                        ELF::SHF_ALLOC |ELF::SHF_MERGE,
 390                        SectionKind::getMergeableConst8());
 391
 392   MergeableConst16Section =
 393     Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS,
 394                        ELF::SHF_ALLOC |ELF::SHF_MERGE,
 395                        SectionKind::getMergeableConst16());
 396
 397   StaticCtorSection =
 398     Ctx->getELFSection(".ctors", ELF::SHT_PROGBITS,
 399                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 400                        SectionKind::getDataRel());
 401
 402   StaticDtorSection =
 403     Ctx->getELFSection(".dtors", ELF::SHT_PROGBITS,
 404                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 405                        SectionKind::getDataRel());
 406
 407   // Exception Handling Sections.
 408
 409   // FIXME: We're emitting LSDA info into a readonly section on ELF, even though
 410   // it contains relocatable pointers.  In PIC mode, this is probably a big
 411   // runtime hit for C++ apps.  Either the contents of the LSDA need to be
 412   // adjusted or this should be a data section.
 413   LSDASection =
 414     Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS,
 415                        ELF::SHF_ALLOC,
 416                        SectionKind::getReadOnly());
 417
 418   // Debug Info Sections.
 419   DwarfAbbrevSection =
 420     Ctx->getELFSection(".debug_abbrev", ELF::SHT_PROGBITS, 0,
 421                        SectionKind::getMetadata());
 422   DwarfInfoSection =
 423     Ctx->getELFSection(".debug_info", ELF::SHT_PROGBITS, 0,
 424                        SectionKind::getMetadata());
 425   DwarfLineSection =
 426     Ctx->getELFSection(".debug_line", ELF::SHT_PROGBITS, 0,
 427                        SectionKind::getMetadata());
 428   DwarfFrameSection =
 429     Ctx->getELFSection(".debug_frame", ELF::SHT_PROGBITS, 0,
 430                        SectionKind::getMetadata());
 431   DwarfPubNamesSection =
 432     Ctx->getELFSection(".debug_pubnames", ELF::SHT_PROGBITS, 0,
 433                        SectionKind::getMetadata());
 434   DwarfPubTypesSection =
 435     Ctx->getELFSection(".debug_pubtypes", ELF::SHT_PROGBITS, 0,
 436                        SectionKind::getMetadata());
 437   DwarfStrSection =
 438     Ctx->getELFSection(".debug_str", ELF::SHT_PROGBITS,
 439                        ELF::SHF_MERGE | ELF::SHF_STRINGS,
 440                        SectionKind::getMergeable1ByteCString());
 441   DwarfLocSection =
 442     Ctx->getELFSection(".debug_loc", ELF::SHT_PROGBITS, 0,
 443                        SectionKind::getMetadata());
 444   DwarfARangesSection =
 445     Ctx->getELFSection(".debug_aranges", ELF::SHT_PROGBITS, 0,
 446                        SectionKind::getMetadata());
 447   DwarfRangesSection =
 448     Ctx->getELFSection(".debug_ranges", ELF::SHT_PROGBITS, 0,
 449                        SectionKind::getMetadata());
 450   DwarfMacroInfoSection =
 451     Ctx->getELFSection(".debug_macinfo", ELF::SHT_PROGBITS, 0,
 452                        SectionKind::getMetadata());
 453
 454   // DWARF5 Experimental Debug Info
 455
 456   // Accelerator Tables
 457   DwarfAccelNamesSection =
 458     Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0,
 459                        SectionKind::getMetadata());
 460   DwarfAccelObjCSection =
 461     Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0,
 462                        SectionKind::getMetadata());
 463   DwarfAccelNamespaceSection =
 464     Ctx->getELFSection(".apple_namespaces", ELF::SHT_PROGBITS, 0,
 465                        SectionKind::getMetadata());
 466   DwarfAccelTypesSection =
 467     Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0,
 468                        SectionKind::getMetadata());
 469
 470   // Fission Sections
 471   DwarfInfoDWOSection =
 472     Ctx->getELFSection(".debug_info.dwo", ELF::SHT_PROGBITS, 0,
 473                        SectionKind::getMetadata());
 474   DwarfAbbrevDWOSection =
 475     Ctx->getELFSection(".debug_abbrev.dwo", ELF::SHT_PROGBITS, 0,
 476                        SectionKind::getMetadata());
 477   DwarfStrDWOSection =
 478     Ctx->getELFSection(".debug_str.dwo", ELF::SHT_PROGBITS,
 479                        ELF::SHF_MERGE | ELF::SHF_STRINGS,
 480                        SectionKind::getMergeable1ByteCString());
 481   DwarfLineDWOSection =
 482     Ctx->getELFSection(".debug_line.dwo", ELF::SHT_PROGBITS, 0,
 483                        SectionKind::getMetadata());
 484   DwarfLocDWOSection =
 485     Ctx->getELFSection(".debug_loc.dwo", ELF::SHT_PROGBITS, 0,
 486                        SectionKind::getMetadata());
 487   DwarfStrOffDWOSection =
 488     Ctx->getELFSection(".debug_str_offsets.dwo", ELF::SHT_PROGBITS, 0,
 489                        SectionKind::getMetadata());
 490   DwarfAddrSection =
 491     Ctx->getELFSection(".debug_addr", ELF::SHT_PROGBITS, 0,
 492                        SectionKind::getMetadata());
 493 }
 494
 495
 496 void MCObjectFileInfo::InitCOFFMCObjectFileInfo(Triple T) {
 497   // COFF
 498   TextSection =
 499     Ctx->getCOFFSection(".text",
 500                         COFF::IMAGE_SCN_CNT_CODE |
 501                         COFF::IMAGE_SCN_MEM_EXECUTE |
 502                         COFF::IMAGE_SCN_MEM_READ,
 503                         SectionKind::getText());
 504   DataSection =
 505     Ctx->getCOFFSection(".data",
 506                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 507                         COFF::IMAGE_SCN_MEM_READ |
 508                         COFF::IMAGE_SCN_MEM_WRITE,
 509                         SectionKind::getDataRel());
 510   ReadOnlySection =
 511     Ctx->getCOFFSection(".rdata",
 512                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 513                         COFF::IMAGE_SCN_MEM_READ,
 514                         SectionKind::getReadOnly());
 515   if (T.getOS() == Triple::Win32) {
 516     StaticCtorSection =
 517       Ctx->getCOFFSection(".CRT$XCU",
 518                           COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 519                           COFF::IMAGE_SCN_MEM_READ,
 520                           SectionKind::getReadOnly());
 521   } else {
 522     StaticCtorSection =
 523       Ctx->getCOFFSection(".ctors",
 524                           COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 525                           COFF::IMAGE_SCN_MEM_READ |
 526                           COFF::IMAGE_SCN_MEM_WRITE,
 527                           SectionKind::getDataRel());
 528   }
 529
 530
 531   if (T.getOS() == Triple::Win32) {
 532     StaticDtorSection =
 533       Ctx->getCOFFSection(".CRT$XTX",
 534                           COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 535                           COFF::IMAGE_SCN_MEM_READ,
 536                           SectionKind::getReadOnly());
 537   } else {
 538     StaticDtorSection =
 539       Ctx->getCOFFSection(".dtors",
 540                           COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 541                           COFF::IMAGE_SCN_MEM_READ |
 542                           COFF::IMAGE_SCN_MEM_WRITE,
 543                           SectionKind::getDataRel());
 544   }
 545
 546   // FIXME: We're emitting LSDA info into a readonly section on COFF, even
 547   // though it contains relocatable pointers.  In PIC mode, this is probably a
 548   // big runtime hit for C++ apps.  Either the contents of the LSDA need to be
 549   // adjusted or this should be a data section.
 550   if (T.getOS() == Triple::Win32) {
 551     // On Windows with SEH, the LSDA is emitted into the .xdata section
 552     LSDASection = 0;
 553   } else {
 554     LSDASection =
 555       Ctx->getCOFFSection(".gcc_except_table",
 556                           COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 557                           COFF::IMAGE_SCN_MEM_READ,
 558                           SectionKind::getReadOnly());
 559   }
 560
 561   // Debug info.
 562   DwarfAbbrevSection =
 563     Ctx->getCOFFSection(".debug_abbrev",
 564                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 565                         COFF::IMAGE_SCN_MEM_READ,
 566                         SectionKind::getMetadata());
 567   DwarfInfoSection =
 568     Ctx->getCOFFSection(".debug_info",
 569                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 570                         COFF::IMAGE_SCN_MEM_READ,
 571                         SectionKind::getMetadata());
 572   DwarfLineSection =
 573     Ctx->getCOFFSection(".debug_line",
 574                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 575                         COFF::IMAGE_SCN_MEM_READ,
 576                         SectionKind::getMetadata());
 577   DwarfFrameSection =
 578     Ctx->getCOFFSection(".debug_frame",
 579                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 580                         COFF::IMAGE_SCN_MEM_READ,
 581                         SectionKind::getMetadata());
 582   DwarfPubNamesSection =
 583     Ctx->getCOFFSection(".debug_pubnames",
 584                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 585                         COFF::IMAGE_SCN_MEM_READ,
 586                         SectionKind::getMetadata());
 587   DwarfPubTypesSection =
 588     Ctx->getCOFFSection(".debug_pubtypes",
 589                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 590                         COFF::IMAGE_SCN_MEM_READ,
 591                         SectionKind::getMetadata());
 592   DwarfStrSection =
 593     Ctx->getCOFFSection(".debug_str",
 594                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 595                         COFF::IMAGE_SCN_MEM_READ,
 596                         SectionKind::getMetadata());
 597   DwarfLocSection =
 598     Ctx->getCOFFSection(".debug_loc",
 599                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 600                         COFF::IMAGE_SCN_MEM_READ,
 601                         SectionKind::getMetadata());
 602   DwarfARangesSection =
 603     Ctx->getCOFFSection(".debug_aranges",
 604                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 605                         COFF::IMAGE_SCN_MEM_READ,
 606                         SectionKind::getMetadata());
 607   DwarfRangesSection =
 608     Ctx->getCOFFSection(".debug_ranges",
 609                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 610                         COFF::IMAGE_SCN_MEM_READ,
 611                         SectionKind::getMetadata());
 612   DwarfMacroInfoSection =
 613     Ctx->getCOFFSection(".debug_macinfo",
 614                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 615                         COFF::IMAGE_SCN_MEM_READ,
 616                         SectionKind::getMetadata());
 617
 618   DrectveSection =
 619     Ctx->getCOFFSection(".drectve",
 620                         COFF::IMAGE_SCN_LNK_INFO,
 621                         SectionKind::getMetadata());
 622
 623   PDataSection =
 624     Ctx->getCOFFSection(".pdata",
 625                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 626                         COFF::IMAGE_SCN_MEM_READ,
 627                         SectionKind::getDataRel());
 628
 629   XDataSection =
 630     Ctx->getCOFFSection(".xdata",
 631                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 632                         COFF::IMAGE_SCN_MEM_READ,
 633                         SectionKind::getDataRel());
 634   TLSDataSection =
 635     Ctx->getCOFFSection(".tls$",
 636                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 637                         COFF::IMAGE_SCN_MEM_READ |
 638                         COFF::IMAGE_SCN_MEM_WRITE,
 639                         SectionKind::getDataRel());
 640 }
 641
 642 void MCObjectFileInfo::InitMCObjectFileInfo(StringRef TT, Reloc::Model relocm,
 643                                             CodeModel::Model cm,
 644                                             MCContext &ctx) {
 645   RelocM = relocm;
 646   CMModel = cm;
 647   Ctx = &ctx;
 648
 649   // Common.
 650   CommDirectiveSupportsAlignment = true;
 651   SupportsWeakOmittedEHFrame = true;
 652   IsFunctionEHFrameSymbolPrivate = true;
 653
 654   PersonalityEncoding = LSDAEncoding = FDEEncoding = FDECFIEncoding =
 655     TTypeEncoding = dwarf::DW_EH_PE_absptr;
 656
 657   CompactUnwindDwarfEHFrameOnly = 0;
 658
 659   EHFrameSection = 0;             // Created on demand.
 660   CompactUnwindSection = 0;       // Used only by selected targets.
 661   DwarfAccelNamesSection = 0;     // Used only by selected targets.
 662   DwarfAccelObjCSection = 0;      // Used only by selected targets.
 663   DwarfAccelNamespaceSection = 0; // Used only by selected targets.
 664   DwarfAccelTypesSection = 0;     // Used only by selected targets.
 665
 666   Triple T(TT);
 667   Triple::ArchType Arch = T.getArch();
 668   // FIXME: Checking for Arch here to filter out bogus triples such as
 669   // cellspu-apple-darwin. Perhaps we should fix in Triple?
 670   if ((Arch == Triple::x86 || Arch == Triple::x86_64 ||
 671        Arch == Triple::arm || Arch == Triple::thumb ||
 672        Arch == Triple::ppc || Arch == Triple::ppc64 ||
 673        Arch == Triple::UnknownArch) &&
 674       (T.isOSDarwin() || T.getEnvironment() == Triple::MachO)) {
 675     Env = IsMachO;
 676     InitMachOMCObjectFileInfo(T);
 677   } else if ((Arch == Triple::x86 || Arch == Triple::x86_64) &&
 678              (T.getEnvironment() != Triple::ELF) &&
 679              (T.getOS() == Triple::MinGW32 || T.getOS() == Triple::Cygwin ||
 680               T.getOS() == Triple::Win32)) {
 681     Env = IsCOFF;
 682     InitCOFFMCObjectFileInfo(T);
 683   } else {
 684     Env = IsELF;
 685     InitELFMCObjectFileInfo(T);
 686   }
 687 }
 688
 689 void MCObjectFileInfo::InitEHFrameSection() {
 690   if (Env == IsMachO)
 691     EHFrameSection =
 692       Ctx->getMachOSection("__TEXT", "__eh_frame",
 693                            MCSectionMachO::S_COALESCED |
 694                            MCSectionMachO::S_ATTR_NO_TOC |
 695                            MCSectionMachO::S_ATTR_STRIP_STATIC_SYMS |
 696                            MCSectionMachO::S_ATTR_LIVE_SUPPORT,
 697                            SectionKind::getReadOnly());
 698   else if (Env == IsELF)
 699     EHFrameSection =
 700       Ctx->getELFSection(".eh_frame", EHSectionType,
 701                          EHSectionFlags,
 702                          SectionKind::getDataRel());
 703   else
 704     EHFrameSection =
 705       Ctx->getCOFFSection(".eh_frame",
 706                           COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 707                           COFF::IMAGE_SCN_MEM_READ |
 708                           COFF::IMAGE_SCN_MEM_WRITE,
 709                           SectionKind::getDataRel());
 710 }