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/StringExtras.h"
  12 #include "llvm/ADT/Triple.h"
  13 #include "llvm/MC/MCContext.h"
  14 #include "llvm/MC/MCSection.h"
  15 #include "llvm/MC/MCSectionCOFF.h"
  16 #include "llvm/MC/MCSectionELF.h"
  17 #include "llvm/MC/MCSectionMachO.h"
  18 using namespace llvm;
  19
  20 void MCObjectFileInfo::InitMachOMCObjectFileInfo(Triple T) {
  21   // MachO
  22   IsFunctionEHFrameSymbolPrivate = false;
  23   SupportsWeakOmittedEHFrame = false;
  24
  25   PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel
  26     | dwarf::DW_EH_PE_sdata4;
  27   LSDAEncoding = FDEEncoding = FDECFIEncoding = dwarf::DW_EH_PE_pcrel;
  28   TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
  29     dwarf::DW_EH_PE_sdata4;
  30
  31   // .comm doesn't support alignment before Leopard.
  32   if (T.isMacOSX() && T.isMacOSXVersionLT(10, 5))
  33     CommDirectiveSupportsAlignment = false;
  34
  35   TextSection // .text
  36     = Ctx->getMachOSection("__TEXT", "__text",
  37                            MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
  38                            SectionKind::getText());
  39   DataSection // .data
  40     = Ctx->getMachOSection("__DATA", "__data", 0,
  41                            SectionKind::getDataRel());
  42
  43   // BSSSection might not be expected initialized on msvc.
  44   BSSSection = 0;
  45
  46   TLSDataSection // .tdata
  47     = Ctx->getMachOSection("__DATA", "__thread_data",
  48                            MCSectionMachO::S_THREAD_LOCAL_REGULAR,
  49                            SectionKind::getDataRel());
  50   TLSBSSSection // .tbss
  51     = Ctx->getMachOSection("__DATA", "__thread_bss",
  52                            MCSectionMachO::S_THREAD_LOCAL_ZEROFILL,
  53                            SectionKind::getThreadBSS());
  54
  55   // TODO: Verify datarel below.
  56   TLSTLVSection // .tlv
  57     = Ctx->getMachOSection("__DATA", "__thread_vars",
  58                            MCSectionMachO::S_THREAD_LOCAL_VARIABLES,
  59                            SectionKind::getDataRel());
  60
  61   TLSThreadInitSection
  62     = Ctx->getMachOSection("__DATA", "__thread_init",
  63                           MCSectionMachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS,
  64                           SectionKind::getDataRel());
  65
  66   CStringSection // .cstring
  67     = Ctx->getMachOSection("__TEXT", "__cstring",
  68                            MCSectionMachO::S_CSTRING_LITERALS,
  69                            SectionKind::getMergeable1ByteCString());
  70   UStringSection
  71     = Ctx->getMachOSection("__TEXT","__ustring", 0,
  72                            SectionKind::getMergeable2ByteCString());
  73   FourByteConstantSection // .literal4
  74     = Ctx->getMachOSection("__TEXT", "__literal4",
  75                            MCSectionMachO::S_4BYTE_LITERALS,
  76                            SectionKind::getMergeableConst4());
  77   EightByteConstantSection // .literal8
  78     = Ctx->getMachOSection("__TEXT", "__literal8",
  79                            MCSectionMachO::S_8BYTE_LITERALS,
  80                            SectionKind::getMergeableConst8());
  81
  82   // ld_classic doesn't support .literal16 in 32-bit mode, and ld64 falls back
  83   // to using it in -static mode.
  84   SixteenByteConstantSection = 0;
  85   if (RelocM != Reloc::Static &&
  86       T.getArch() != Triple::x86_64 && T.getArch() != Triple::ppc64 &&
  87       T.getArch() != Triple::ppc64le)
  88     SixteenByteConstantSection =   // .literal16
  89       Ctx->getMachOSection("__TEXT", "__literal16",
  90                            MCSectionMachO::S_16BYTE_LITERALS,
  91                            SectionKind::getMergeableConst16());
  92
  93   ReadOnlySection  // .const
  94     = Ctx->getMachOSection("__TEXT", "__const", 0,
  95                            SectionKind::getReadOnly());
  96
  97   TextCoalSection
  98     = Ctx->getMachOSection("__TEXT", "__textcoal_nt",
  99                            MCSectionMachO::S_COALESCED |
 100                            MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
 101                            SectionKind::getText());
 102   ConstTextCoalSection
 103     = Ctx->getMachOSection("__TEXT", "__const_coal",
 104                            MCSectionMachO::S_COALESCED,
 105                            SectionKind::getReadOnly());
 106   ConstDataSection  // .const_data
 107     = Ctx->getMachOSection("__DATA", "__const", 0,
 108                            SectionKind::getReadOnlyWithRel());
 109   DataCoalSection
 110     = Ctx->getMachOSection("__DATA","__datacoal_nt",
 111                            MCSectionMachO::S_COALESCED,
 112                            SectionKind::getDataRel());
 113   DataCommonSection
 114     = Ctx->getMachOSection("__DATA","__common",
 115                            MCSectionMachO::S_ZEROFILL,
 116                            SectionKind::getBSS());
 117   DataBSSSection
 118     = Ctx->getMachOSection("__DATA","__bss", MCSectionMachO::S_ZEROFILL,
 119                            SectionKind::getBSS());
 120
 121
 122   LazySymbolPointerSection
 123     = Ctx->getMachOSection("__DATA", "__la_symbol_ptr",
 124                            MCSectionMachO::S_LAZY_SYMBOL_POINTERS,
 125                            SectionKind::getMetadata());
 126   NonLazySymbolPointerSection
 127     = Ctx->getMachOSection("__DATA", "__nl_symbol_ptr",
 128                            MCSectionMachO::S_NON_LAZY_SYMBOL_POINTERS,
 129                            SectionKind::getMetadata());
 130
 131   if (RelocM == Reloc::Static) {
 132     StaticCtorSection
 133       = Ctx->getMachOSection("__TEXT", "__constructor", 0,
 134                              SectionKind::getDataRel());
 135     StaticDtorSection
 136       = Ctx->getMachOSection("__TEXT", "__destructor", 0,
 137                              SectionKind::getDataRel());
 138   } else {
 139     StaticCtorSection
 140       = Ctx->getMachOSection("__DATA", "__mod_init_func",
 141                              MCSectionMachO::S_MOD_INIT_FUNC_POINTERS,
 142                              SectionKind::getDataRel());
 143     StaticDtorSection
 144       = Ctx->getMachOSection("__DATA", "__mod_term_func",
 145                              MCSectionMachO::S_MOD_TERM_FUNC_POINTERS,
 146                              SectionKind::getDataRel());
 147   }
 148
 149   // Exception Handling.
 150   LSDASection = Ctx->getMachOSection("__TEXT", "__gcc_except_tab", 0,
 151                                      SectionKind::getReadOnlyWithRel());
 152
 153   if (T.isMacOSX() && !T.isMacOSXVersionLT(10, 6)) {
 154     CompactUnwindSection =
 155       Ctx->getMachOSection("__LD", "__compact_unwind",
 156                            MCSectionMachO::S_ATTR_DEBUG,
 157                            SectionKind::getReadOnly());
 158
 159     if (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86)
 160       CompactUnwindDwarfEHFrameOnly = 0x04000000;
 161   }
 162
 163   // Debug Information.
 164   DwarfAccelNamesSection =
 165     Ctx->getMachOSection("__DWARF", "__apple_names",
 166                          MCSectionMachO::S_ATTR_DEBUG,
 167                          SectionKind::getMetadata());
 168   DwarfAccelObjCSection =
 169     Ctx->getMachOSection("__DWARF", "__apple_objc",
 170                          MCSectionMachO::S_ATTR_DEBUG,
 171                          SectionKind::getMetadata());
 172   // 16 character section limit...
 173   DwarfAccelNamespaceSection =
 174     Ctx->getMachOSection("__DWARF", "__apple_namespac",
 175                          MCSectionMachO::S_ATTR_DEBUG,
 176                          SectionKind::getMetadata());
 177   DwarfAccelTypesSection =
 178     Ctx->getMachOSection("__DWARF", "__apple_types",
 179                          MCSectionMachO::S_ATTR_DEBUG,
 180                          SectionKind::getMetadata());
 181
 182   DwarfAbbrevSection =
 183     Ctx->getMachOSection("__DWARF", "__debug_abbrev",
 184                          MCSectionMachO::S_ATTR_DEBUG,
 185                          SectionKind::getMetadata());
 186   DwarfInfoSection =
 187     Ctx->getMachOSection("__DWARF", "__debug_info",
 188                          MCSectionMachO::S_ATTR_DEBUG,
 189                          SectionKind::getMetadata());
 190   DwarfLineSection =
 191     Ctx->getMachOSection("__DWARF", "__debug_line",
 192                          MCSectionMachO::S_ATTR_DEBUG,
 193                          SectionKind::getMetadata());
 194   DwarfFrameSection =
 195     Ctx->getMachOSection("__DWARF", "__debug_frame",
 196                          MCSectionMachO::S_ATTR_DEBUG,
 197                          SectionKind::getMetadata());
 198   DwarfPubNamesSection =
 199     Ctx->getMachOSection("__DWARF", "__debug_pubnames",
 200                          MCSectionMachO::S_ATTR_DEBUG,
 201                          SectionKind::getMetadata());
 202   DwarfPubTypesSection =
 203     Ctx->getMachOSection("__DWARF", "__debug_pubtypes",
 204                          MCSectionMachO::S_ATTR_DEBUG,
 205                          SectionKind::getMetadata());
 206   DwarfGnuPubNamesSection =
 207     Ctx->getMachOSection("__DWARF", "__debug_gnu_pubn",
 208                          MCSectionMachO::S_ATTR_DEBUG,
 209                          SectionKind::getMetadata());
 210   DwarfGnuPubTypesSection =
 211     Ctx->getMachOSection("__DWARF", "__debug_gnu_pubt",
 212                          MCSectionMachO::S_ATTR_DEBUG,
 213                          SectionKind::getMetadata());
 214   DwarfStrSection =
 215     Ctx->getMachOSection("__DWARF", "__debug_str",
 216                          MCSectionMachO::S_ATTR_DEBUG,
 217                          SectionKind::getMetadata());
 218   DwarfLocSection =
 219     Ctx->getMachOSection("__DWARF", "__debug_loc",
 220                          MCSectionMachO::S_ATTR_DEBUG,
 221                          SectionKind::getMetadata());
 222   DwarfARangesSection =
 223     Ctx->getMachOSection("__DWARF", "__debug_aranges",
 224                          MCSectionMachO::S_ATTR_DEBUG,
 225                          SectionKind::getMetadata());
 226   DwarfRangesSection =
 227     Ctx->getMachOSection("__DWARF", "__debug_ranges",
 228                          MCSectionMachO::S_ATTR_DEBUG,
 229                          SectionKind::getMetadata());
 230   DwarfMacroInfoSection =
 231     Ctx->getMachOSection("__DWARF", "__debug_macinfo",
 232                          MCSectionMachO::S_ATTR_DEBUG,
 233                          SectionKind::getMetadata());
 234   DwarfDebugInlineSection =
 235     Ctx->getMachOSection("__DWARF", "__debug_inlined",
 236                          MCSectionMachO::S_ATTR_DEBUG,
 237                          SectionKind::getMetadata());
 238   StackMapSection =
 239     Ctx->getMachOSection("__LLVM_STACKMAPS", "__llvm_stackmaps", 0,
 240                          SectionKind::getMetadata());
 241
 242   TLSExtraDataSection = TLSTLVSection;
 243 }
 244
 245 void MCObjectFileInfo::InitELFMCObjectFileInfo(Triple T) {
 246   if (T.getArch() == Triple::mips ||
 247       T.getArch() == Triple::mipsel)
 248     FDECFIEncoding = dwarf::DW_EH_PE_sdata4;
 249   else if (T.getArch() == Triple::mips64 ||
 250            T.getArch() == Triple::mips64el)
 251     FDECFIEncoding = dwarf::DW_EH_PE_sdata8;
 252   else
 253     FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 254
 255   if (T.getArch() == Triple::x86) {
 256     PersonalityEncoding = (RelocM == Reloc::PIC_)
 257      ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
 258      : dwarf::DW_EH_PE_absptr;
 259     LSDAEncoding = (RelocM == Reloc::PIC_)
 260       ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
 261       : dwarf::DW_EH_PE_absptr;
 262     FDEEncoding = (RelocM == Reloc::PIC_)
 263       ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
 264       : dwarf::DW_EH_PE_absptr;
 265     TTypeEncoding = (RelocM == Reloc::PIC_)
 266      ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
 267      : dwarf::DW_EH_PE_absptr;
 268   } else if (T.getArch() == Triple::x86_64) {
 269     if (RelocM == Reloc::PIC_) {
 270       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 271         ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
 272          ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
 273       LSDAEncoding = dwarf::DW_EH_PE_pcrel |
 274         (CMModel == CodeModel::Small
 275          ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
 276       FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 277       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 278         ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
 279          ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
 280     } else {
 281       PersonalityEncoding =
 282         (CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
 283         ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
 284       LSDAEncoding = (CMModel == CodeModel::Small)
 285         ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
 286       FDEEncoding = dwarf::DW_EH_PE_udata4;
 287       TTypeEncoding = (CMModel == CodeModel::Small)
 288         ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
 289     }
 290   }  else if (T.getArch() ==  Triple::aarch64) {
 291     // The small model guarantees static code/data size < 4GB, but not where it
 292     // will be in memory. Most of these could end up >2GB away so even a signed
 293     // pc-relative 32-bit address is insufficient, theoretically.
 294     if (RelocM == Reloc::PIC_) {
 295       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 296         dwarf::DW_EH_PE_sdata8;
 297       LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8;
 298       FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 299       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 300         dwarf::DW_EH_PE_sdata8;
 301     } else {
 302       PersonalityEncoding = dwarf::DW_EH_PE_absptr;
 303       LSDAEncoding = dwarf::DW_EH_PE_absptr;
 304       FDEEncoding = dwarf::DW_EH_PE_udata4;
 305       TTypeEncoding = dwarf::DW_EH_PE_absptr;
 306     }
 307   } else if (T.getArch() == Triple::ppc64 || T.getArch() == Triple::ppc64le) {
 308     PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 309       dwarf::DW_EH_PE_udata8;
 310     LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
 311     FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
 312     TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 313       dwarf::DW_EH_PE_udata8;
 314   } else if (T.getArch() == Triple::sparc) {
 315     if (RelocM == Reloc::PIC_) {
 316       LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 317       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 318         dwarf::DW_EH_PE_sdata4;
 319       FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 320       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 321         dwarf::DW_EH_PE_sdata4;
 322     } else {
 323       LSDAEncoding = dwarf::DW_EH_PE_absptr;
 324       PersonalityEncoding = dwarf::DW_EH_PE_absptr;
 325       FDEEncoding = dwarf::DW_EH_PE_udata4;
 326       TTypeEncoding = dwarf::DW_EH_PE_absptr;
 327     }
 328   } else if (T.getArch() == Triple::sparcv9) {
 329     LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 330     if (RelocM == Reloc::PIC_) {
 331       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 332         dwarf::DW_EH_PE_sdata4;
 333       FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 334       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 335         dwarf::DW_EH_PE_sdata4;
 336     } else {
 337       PersonalityEncoding = dwarf::DW_EH_PE_absptr;
 338       FDEEncoding = dwarf::DW_EH_PE_udata4;
 339       TTypeEncoding = dwarf::DW_EH_PE_absptr;
 340     }
 341   } else if (T.getArch() == Triple::systemz) {
 342     // All currently-defined code models guarantee that 4-byte PC-relative
 343     // values will be in range.
 344     if (RelocM == Reloc::PIC_) {
 345       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 346         dwarf::DW_EH_PE_sdata4;
 347       LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 348       FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 349       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 350         dwarf::DW_EH_PE_sdata4;
 351     } else {
 352       PersonalityEncoding = dwarf::DW_EH_PE_absptr;
 353       LSDAEncoding = dwarf::DW_EH_PE_absptr;
 354       FDEEncoding = dwarf::DW_EH_PE_absptr;
 355       TTypeEncoding = dwarf::DW_EH_PE_absptr;
 356     }
 357   }
 358
 359   // Solaris requires different flags for .eh_frame to seemingly every other
 360   // platform.
 361   EHSectionType = ELF::SHT_PROGBITS;
 362   EHSectionFlags = ELF::SHF_ALLOC;
 363   if (T.getOS() == Triple::Solaris) {
 364     if (T.getArch() == Triple::x86_64)
 365       EHSectionType = ELF::SHT_X86_64_UNWIND;
 366     else
 367       EHSectionFlags |= ELF::SHF_WRITE;
 368   }
 369
 370
 371   // ELF
 372   BSSSection =
 373     Ctx->getELFSection(".bss", ELF::SHT_NOBITS,
 374                        ELF::SHF_WRITE | ELF::SHF_ALLOC,
 375                        SectionKind::getBSS());
 376
 377   TextSection =
 378     Ctx->getELFSection(".text", ELF::SHT_PROGBITS,
 379                        ELF::SHF_EXECINSTR |
 380                        ELF::SHF_ALLOC,
 381                        SectionKind::getText());
 382
 383   DataSection =
 384     Ctx->getELFSection(".data", ELF::SHT_PROGBITS,
 385                        ELF::SHF_WRITE |ELF::SHF_ALLOC,
 386                        SectionKind::getDataRel());
 387
 388   ReadOnlySection =
 389     Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS,
 390                        ELF::SHF_ALLOC,
 391                        SectionKind::getReadOnly());
 392
 393   TLSDataSection =
 394     Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS,
 395                        ELF::SHF_ALLOC | ELF::SHF_TLS |
 396                        ELF::SHF_WRITE,
 397                        SectionKind::getThreadData());
 398
 399   TLSBSSSection =
 400     Ctx->getELFSection(".tbss", ELF::SHT_NOBITS,
 401                        ELF::SHF_ALLOC | ELF::SHF_TLS |
 402                        ELF::SHF_WRITE,
 403                        SectionKind::getThreadBSS());
 404
 405   DataRelSection =
 406     Ctx->getELFSection(".data.rel", ELF::SHT_PROGBITS,
 407                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 408                        SectionKind::getDataRel());
 409
 410   DataRelLocalSection =
 411     Ctx->getELFSection(".data.rel.local", ELF::SHT_PROGBITS,
 412                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 413                        SectionKind::getDataRelLocal());
 414
 415   DataRelROSection =
 416     Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS,
 417                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 418                        SectionKind::getReadOnlyWithRel());
 419
 420   DataRelROLocalSection =
 421     Ctx->getELFSection(".data.rel.ro.local", ELF::SHT_PROGBITS,
 422                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 423                        SectionKind::getReadOnlyWithRelLocal());
 424
 425   MergeableConst4Section =
 426     Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS,
 427                        ELF::SHF_ALLOC |ELF::SHF_MERGE,
 428                        SectionKind::getMergeableConst4());
 429
 430   MergeableConst8Section =
 431     Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS,
 432                        ELF::SHF_ALLOC |ELF::SHF_MERGE,
 433                        SectionKind::getMergeableConst8());
 434
 435   MergeableConst16Section =
 436     Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS,
 437                        ELF::SHF_ALLOC |ELF::SHF_MERGE,
 438                        SectionKind::getMergeableConst16());
 439
 440   StaticCtorSection =
 441     Ctx->getELFSection(".ctors", ELF::SHT_PROGBITS,
 442                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 443                        SectionKind::getDataRel());
 444
 445   StaticDtorSection =
 446     Ctx->getELFSection(".dtors", ELF::SHT_PROGBITS,
 447                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 448                        SectionKind::getDataRel());
 449
 450   // Exception Handling Sections.
 451
 452   // FIXME: We're emitting LSDA info into a readonly section on ELF, even though
 453   // it contains relocatable pointers.  In PIC mode, this is probably a big
 454   // runtime hit for C++ apps.  Either the contents of the LSDA need to be
 455   // adjusted or this should be a data section.
 456   LSDASection =
 457     Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS,
 458                        ELF::SHF_ALLOC,
 459                        SectionKind::getReadOnly());
 460
 461   // Debug Info Sections.
 462   DwarfAbbrevSection =
 463     Ctx->getELFSection(".debug_abbrev", ELF::SHT_PROGBITS, 0,
 464                        SectionKind::getMetadata());
 465   DwarfInfoSection =
 466     Ctx->getELFSection(".debug_info", ELF::SHT_PROGBITS, 0,
 467                        SectionKind::getMetadata());
 468   DwarfLineSection =
 469     Ctx->getELFSection(".debug_line", ELF::SHT_PROGBITS, 0,
 470                        SectionKind::getMetadata());
 471   DwarfFrameSection =
 472     Ctx->getELFSection(".debug_frame", ELF::SHT_PROGBITS, 0,
 473                        SectionKind::getMetadata());
 474   DwarfPubNamesSection =
 475     Ctx->getELFSection(".debug_pubnames", ELF::SHT_PROGBITS, 0,
 476                        SectionKind::getMetadata());
 477   DwarfPubTypesSection =
 478     Ctx->getELFSection(".debug_pubtypes", ELF::SHT_PROGBITS, 0,
 479                        SectionKind::getMetadata());
 480   DwarfGnuPubNamesSection =
 481     Ctx->getELFSection(".debug_gnu_pubnames", ELF::SHT_PROGBITS, 0,
 482                        SectionKind::getMetadata());
 483   DwarfGnuPubTypesSection =
 484     Ctx->getELFSection(".debug_gnu_pubtypes", ELF::SHT_PROGBITS, 0,
 485                        SectionKind::getMetadata());
 486   DwarfStrSection =
 487     Ctx->getELFSection(".debug_str", ELF::SHT_PROGBITS,
 488                        ELF::SHF_MERGE | ELF::SHF_STRINGS,
 489                        SectionKind::getMergeable1ByteCString());
 490   DwarfLocSection =
 491     Ctx->getELFSection(".debug_loc", ELF::SHT_PROGBITS, 0,
 492                        SectionKind::getMetadata());
 493   DwarfARangesSection =
 494     Ctx->getELFSection(".debug_aranges", ELF::SHT_PROGBITS, 0,
 495                        SectionKind::getMetadata());
 496   DwarfRangesSection =
 497     Ctx->getELFSection(".debug_ranges", ELF::SHT_PROGBITS, 0,
 498                        SectionKind::getMetadata());
 499   DwarfMacroInfoSection =
 500     Ctx->getELFSection(".debug_macinfo", ELF::SHT_PROGBITS, 0,
 501                        SectionKind::getMetadata());
 502
 503   // DWARF5 Experimental Debug Info
 504
 505   // Accelerator Tables
 506   DwarfAccelNamesSection =
 507     Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0,
 508                        SectionKind::getMetadata());
 509   DwarfAccelObjCSection =
 510     Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0,
 511                        SectionKind::getMetadata());
 512   DwarfAccelNamespaceSection =
 513     Ctx->getELFSection(".apple_namespaces", ELF::SHT_PROGBITS, 0,
 514                        SectionKind::getMetadata());
 515   DwarfAccelTypesSection =
 516     Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0,
 517                        SectionKind::getMetadata());
 518
 519   // Fission Sections
 520   DwarfInfoDWOSection =
 521     Ctx->getELFSection(".debug_info.dwo", ELF::SHT_PROGBITS, 0,
 522                        SectionKind::getMetadata());
 523   DwarfAbbrevDWOSection =
 524     Ctx->getELFSection(".debug_abbrev.dwo", ELF::SHT_PROGBITS, 0,
 525                        SectionKind::getMetadata());
 526   DwarfStrDWOSection =
 527     Ctx->getELFSection(".debug_str.dwo", ELF::SHT_PROGBITS,
 528                        ELF::SHF_MERGE | ELF::SHF_STRINGS,
 529                        SectionKind::getMergeable1ByteCString());
 530   DwarfLineDWOSection =
 531     Ctx->getELFSection(".debug_line.dwo", ELF::SHT_PROGBITS, 0,
 532                        SectionKind::getMetadata());
 533   DwarfLocDWOSection =
 534     Ctx->getELFSection(".debug_loc.dwo", ELF::SHT_PROGBITS, 0,
 535                        SectionKind::getMetadata());
 536   DwarfStrOffDWOSection =
 537     Ctx->getELFSection(".debug_str_offsets.dwo", ELF::SHT_PROGBITS, 0,
 538                        SectionKind::getMetadata());
 539   DwarfAddrSection =
 540     Ctx->getELFSection(".debug_addr", ELF::SHT_PROGBITS, 0,
 541                        SectionKind::getMetadata());
 542 }
 543
 544
 545 void MCObjectFileInfo::InitCOFFMCObjectFileInfo(Triple T) {
 546   // COFF
 547   BSSSection =
 548     Ctx->getCOFFSection(".bss",
 549                         COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA |
 550                         COFF::IMAGE_SCN_MEM_READ |
 551                         COFF::IMAGE_SCN_MEM_WRITE,
 552                         SectionKind::getBSS());
 553   TextSection =
 554     Ctx->getCOFFSection(".text",
 555                         COFF::IMAGE_SCN_CNT_CODE |
 556                         COFF::IMAGE_SCN_MEM_EXECUTE |
 557                         COFF::IMAGE_SCN_MEM_READ,
 558                         SectionKind::getText());
 559   DataSection =
 560     Ctx->getCOFFSection(".data",
 561                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 562                         COFF::IMAGE_SCN_MEM_READ |
 563                         COFF::IMAGE_SCN_MEM_WRITE,
 564                         SectionKind::getDataRel());
 565   ReadOnlySection =
 566     Ctx->getCOFFSection(".rdata",
 567                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 568                         COFF::IMAGE_SCN_MEM_READ,
 569                         SectionKind::getReadOnly());
 570   if (T.getOS() == Triple::Win32) {
 571     StaticCtorSection =
 572       Ctx->getCOFFSection(".CRT$XCU",
 573                           COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 574                           COFF::IMAGE_SCN_MEM_READ,
 575                           SectionKind::getReadOnly());
 576   } else {
 577     StaticCtorSection =
 578       Ctx->getCOFFSection(".ctors",
 579                           COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 580                           COFF::IMAGE_SCN_MEM_READ |
 581                           COFF::IMAGE_SCN_MEM_WRITE,
 582                           SectionKind::getDataRel());
 583   }
 584
 585
 586   if (T.getOS() == Triple::Win32) {
 587     StaticDtorSection =
 588       Ctx->getCOFFSection(".CRT$XTX",
 589                           COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 590                           COFF::IMAGE_SCN_MEM_READ,
 591                           SectionKind::getReadOnly());
 592   } else {
 593     StaticDtorSection =
 594       Ctx->getCOFFSection(".dtors",
 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   // FIXME: We're emitting LSDA info into a readonly section on COFF, even
 602   // though it contains relocatable pointers.  In PIC mode, this is probably a
 603   // big runtime hit for C++ apps.  Either the contents of the LSDA need to be
 604   // adjusted or this should be a data section.
 605   LSDASection =
 606     Ctx->getCOFFSection(".gcc_except_table",
 607                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 608                         COFF::IMAGE_SCN_MEM_READ,
 609                         SectionKind::getReadOnly());
 610
 611   // Debug info.
 612   COFFDebugSymbolsSection =
 613     Ctx->getCOFFSection(".debug$S",
 614                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 615                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 616                         COFF::IMAGE_SCN_MEM_READ,
 617                         SectionKind::getMetadata());
 618
 619   DwarfAbbrevSection =
 620     Ctx->getCOFFSection(".debug_abbrev",
 621                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 622                         COFF::IMAGE_SCN_MEM_READ,
 623                         SectionKind::getMetadata());
 624   DwarfInfoSection =
 625     Ctx->getCOFFSection(".debug_info",
 626                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 627                         COFF::IMAGE_SCN_MEM_READ,
 628                         SectionKind::getMetadata());
 629   DwarfLineSection =
 630     Ctx->getCOFFSection(".debug_line",
 631                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 632                         COFF::IMAGE_SCN_MEM_READ,
 633                         SectionKind::getMetadata());
 634   DwarfFrameSection =
 635     Ctx->getCOFFSection(".debug_frame",
 636                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 637                         COFF::IMAGE_SCN_MEM_READ,
 638                         SectionKind::getMetadata());
 639   DwarfPubNamesSection =
 640     Ctx->getCOFFSection(".debug_pubnames",
 641                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 642                         COFF::IMAGE_SCN_MEM_READ,
 643                         SectionKind::getMetadata());
 644   DwarfPubTypesSection =
 645     Ctx->getCOFFSection(".debug_pubtypes",
 646                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 647                         COFF::IMAGE_SCN_MEM_READ,
 648                         SectionKind::getMetadata());
 649   DwarfGnuPubNamesSection =
 650     Ctx->getCOFFSection(".debug_gnu_pubnames",
 651                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 652                         COFF::IMAGE_SCN_MEM_READ,
 653                         SectionKind::getMetadata());
 654   DwarfGnuPubTypesSection =
 655     Ctx->getCOFFSection(".debug_gnu_pubtypes",
 656                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 657                         COFF::IMAGE_SCN_MEM_READ,
 658                         SectionKind::getMetadata());
 659   DwarfStrSection =
 660     Ctx->getCOFFSection(".debug_str",
 661                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 662                         COFF::IMAGE_SCN_MEM_READ,
 663                         SectionKind::getMetadata());
 664   DwarfLocSection =
 665     Ctx->getCOFFSection(".debug_loc",
 666                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 667                         COFF::IMAGE_SCN_MEM_READ,
 668                         SectionKind::getMetadata());
 669   DwarfARangesSection =
 670     Ctx->getCOFFSection(".debug_aranges",
 671                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 672                         COFF::IMAGE_SCN_MEM_READ,
 673                         SectionKind::getMetadata());
 674   DwarfRangesSection =
 675     Ctx->getCOFFSection(".debug_ranges",
 676                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 677                         COFF::IMAGE_SCN_MEM_READ,
 678                         SectionKind::getMetadata());
 679   DwarfMacroInfoSection =
 680     Ctx->getCOFFSection(".debug_macinfo",
 681                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 682                         COFF::IMAGE_SCN_MEM_READ,
 683                         SectionKind::getMetadata());
 684
 685   DrectveSection =
 686     Ctx->getCOFFSection(".drectve",
 687                         COFF::IMAGE_SCN_LNK_INFO,
 688                         SectionKind::getMetadata());
 689
 690   PDataSection =
 691     Ctx->getCOFFSection(".pdata",
 692                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 693                         COFF::IMAGE_SCN_MEM_READ,
 694                         SectionKind::getDataRel());
 695
 696   XDataSection =
 697     Ctx->getCOFFSection(".xdata",
 698                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 699                         COFF::IMAGE_SCN_MEM_READ,
 700                         SectionKind::getDataRel());
 701   TLSDataSection =
 702     Ctx->getCOFFSection(".tls$",
 703                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 704                         COFF::IMAGE_SCN_MEM_READ |
 705                         COFF::IMAGE_SCN_MEM_WRITE,
 706                         SectionKind::getDataRel());
 707 }
 708
 709 void MCObjectFileInfo::InitMCObjectFileInfo(StringRef TT, Reloc::Model relocm,
 710                                             CodeModel::Model cm,
 711                                             MCContext &ctx) {
 712   RelocM = relocm;
 713   CMModel = cm;
 714   Ctx = &ctx;
 715
 716   // Common.
 717   CommDirectiveSupportsAlignment = true;
 718   SupportsWeakOmittedEHFrame = true;
 719   IsFunctionEHFrameSymbolPrivate = true;
 720
 721   PersonalityEncoding = LSDAEncoding = FDEEncoding = FDECFIEncoding =
 722     TTypeEncoding = dwarf::DW_EH_PE_absptr;
 723
 724   CompactUnwindDwarfEHFrameOnly = 0;
 725
 726   EHFrameSection = 0;             // Created on demand.
 727   CompactUnwindSection = 0;       // Used only by selected targets.
 728   DwarfAccelNamesSection = 0;     // Used only by selected targets.
 729   DwarfAccelObjCSection = 0;      // Used only by selected targets.
 730   DwarfAccelNamespaceSection = 0; // Used only by selected targets.
 731   DwarfAccelTypesSection = 0;     // Used only by selected targets.
 732
 733   Triple T(TT);
 734   Triple::ArchType Arch = T.getArch();
 735   // FIXME: Checking for Arch here to filter out bogus triples such as
 736   // cellspu-apple-darwin. Perhaps we should fix in Triple?
 737   if ((Arch == Triple::x86 || Arch == Triple::x86_64 ||
 738        Arch == Triple::arm || Arch == Triple::thumb ||
 739        Arch == Triple::ppc || Arch == Triple::ppc64 ||
 740        Arch == Triple::UnknownArch) &&
 741       (T.isOSDarwin() || T.getEnvironment() == Triple::MachO)) {
 742     Env = IsMachO;
 743     InitMachOMCObjectFileInfo(T);
 744   } else if ((Arch == Triple::x86 || Arch == Triple::x86_64) &&
 745              (T.getEnvironment() != Triple::ELF) &&
 746              (T.getOS() == Triple::MinGW32 || T.getOS() == Triple::Cygwin ||
 747               T.getOS() == Triple::Win32)) {
 748     Env = IsCOFF;
 749     InitCOFFMCObjectFileInfo(T);
 750   } else {
 751     Env = IsELF;
 752     InitELFMCObjectFileInfo(T);
 753   }
 754 }
 755
 756 const MCSection *MCObjectFileInfo::getDwarfTypesSection(uint64_t Hash) const {
 757   return Ctx->getELFSection(".debug_types", ELF::SHT_PROGBITS, ELF::SHF_GROUP,
 758                             SectionKind::getMetadata(), 0, utostr(Hash));
 759 }
 760
 761 const MCSection *
 762 MCObjectFileInfo::getDwarfTypesDWOSection(uint64_t Hash) const {
 763   return Ctx->getELFSection(".debug_types.dwo", ELF::SHT_PROGBITS,
 764                             ELF::SHF_GROUP, SectionKind::getMetadata(), 0,
 765                             utostr(Hash));
 766 }
 767
 768 void MCObjectFileInfo::InitEHFrameSection() {
 769   if (Env == IsMachO)
 770     EHFrameSection =
 771       Ctx->getMachOSection("__TEXT", "__eh_frame",
 772                            MCSectionMachO::S_COALESCED |
 773                            MCSectionMachO::S_ATTR_NO_TOC |
 774                            MCSectionMachO::S_ATTR_STRIP_STATIC_SYMS |
 775                            MCSectionMachO::S_ATTR_LIVE_SUPPORT,
 776                            SectionKind::getReadOnly());
 777   else if (Env == IsELF)
 778     EHFrameSection =
 779       Ctx->getELFSection(".eh_frame", EHSectionType,
 780                          EHSectionFlags,
 781                          SectionKind::getDataRel());
 782   else
 783     EHFrameSection =
 784       Ctx->getCOFFSection(".eh_frame",
 785                           COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 786                           COFF::IMAGE_SCN_MEM_READ |
 787                           COFF::IMAGE_SCN_MEM_WRITE,
 788                           SectionKind::getDataRel());
 789 }