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   COFFDebugSymbolsSection = 0;
 154
 155   if (T.isMacOSX() && !T.isMacOSXVersionLT(10, 6)) {
 156     CompactUnwindSection =
 157       Ctx->getMachOSection("__LD", "__compact_unwind",
 158                            MCSectionMachO::S_ATTR_DEBUG,
 159                            SectionKind::getReadOnly());
 160
 161     if (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86)
 162       CompactUnwindDwarfEHFrameOnly = 0x04000000;
 163   }
 164
 165   // Debug Information.
 166   DwarfAccelNamesSection =
 167     Ctx->getMachOSection("__DWARF", "__apple_names",
 168                          MCSectionMachO::S_ATTR_DEBUG,
 169                          SectionKind::getMetadata());
 170   DwarfAccelObjCSection =
 171     Ctx->getMachOSection("__DWARF", "__apple_objc",
 172                          MCSectionMachO::S_ATTR_DEBUG,
 173                          SectionKind::getMetadata());
 174   // 16 character section limit...
 175   DwarfAccelNamespaceSection =
 176     Ctx->getMachOSection("__DWARF", "__apple_namespac",
 177                          MCSectionMachO::S_ATTR_DEBUG,
 178                          SectionKind::getMetadata());
 179   DwarfAccelTypesSection =
 180     Ctx->getMachOSection("__DWARF", "__apple_types",
 181                          MCSectionMachO::S_ATTR_DEBUG,
 182                          SectionKind::getMetadata());
 183
 184   DwarfAbbrevSection =
 185     Ctx->getMachOSection("__DWARF", "__debug_abbrev",
 186                          MCSectionMachO::S_ATTR_DEBUG,
 187                          SectionKind::getMetadata());
 188   DwarfInfoSection =
 189     Ctx->getMachOSection("__DWARF", "__debug_info",
 190                          MCSectionMachO::S_ATTR_DEBUG,
 191                          SectionKind::getMetadata());
 192   DwarfLineSection =
 193     Ctx->getMachOSection("__DWARF", "__debug_line",
 194                          MCSectionMachO::S_ATTR_DEBUG,
 195                          SectionKind::getMetadata());
 196   DwarfFrameSection =
 197     Ctx->getMachOSection("__DWARF", "__debug_frame",
 198                          MCSectionMachO::S_ATTR_DEBUG,
 199                          SectionKind::getMetadata());
 200   DwarfPubNamesSection =
 201     Ctx->getMachOSection("__DWARF", "__debug_pubnames",
 202                          MCSectionMachO::S_ATTR_DEBUG,
 203                          SectionKind::getMetadata());
 204   DwarfPubTypesSection =
 205     Ctx->getMachOSection("__DWARF", "__debug_pubtypes",
 206                          MCSectionMachO::S_ATTR_DEBUG,
 207                          SectionKind::getMetadata());
 208   DwarfGnuPubNamesSection =
 209     Ctx->getMachOSection("__DWARF", "__debug_gnu_pubn",
 210                          MCSectionMachO::S_ATTR_DEBUG,
 211                          SectionKind::getMetadata());
 212   DwarfGnuPubTypesSection =
 213     Ctx->getMachOSection("__DWARF", "__debug_gnu_pubt",
 214                          MCSectionMachO::S_ATTR_DEBUG,
 215                          SectionKind::getMetadata());
 216   DwarfStrSection =
 217     Ctx->getMachOSection("__DWARF", "__debug_str",
 218                          MCSectionMachO::S_ATTR_DEBUG,
 219                          SectionKind::getMetadata());
 220   DwarfLocSection =
 221     Ctx->getMachOSection("__DWARF", "__debug_loc",
 222                          MCSectionMachO::S_ATTR_DEBUG,
 223                          SectionKind::getMetadata());
 224   DwarfARangesSection =
 225     Ctx->getMachOSection("__DWARF", "__debug_aranges",
 226                          MCSectionMachO::S_ATTR_DEBUG,
 227                          SectionKind::getMetadata());
 228   DwarfRangesSection =
 229     Ctx->getMachOSection("__DWARF", "__debug_ranges",
 230                          MCSectionMachO::S_ATTR_DEBUG,
 231                          SectionKind::getMetadata());
 232   DwarfMacroInfoSection =
 233     Ctx->getMachOSection("__DWARF", "__debug_macinfo",
 234                          MCSectionMachO::S_ATTR_DEBUG,
 235                          SectionKind::getMetadata());
 236   DwarfDebugInlineSection =
 237     Ctx->getMachOSection("__DWARF", "__debug_inlined",
 238                          MCSectionMachO::S_ATTR_DEBUG,
 239                          SectionKind::getMetadata());
 240   StackMapSection =
 241     Ctx->getMachOSection("__LLVM_STACKMAPS", "__llvm_stackmaps", 0,
 242                          SectionKind::getMetadata());
 243
 244   TLSExtraDataSection = TLSTLVSection;
 245 }
 246
 247 void MCObjectFileInfo::InitELFMCObjectFileInfo(Triple T) {
 248   if (T.getArch() == Triple::mips ||
 249       T.getArch() == Triple::mipsel)
 250     FDECFIEncoding = dwarf::DW_EH_PE_sdata4;
 251   else if (T.getArch() == Triple::mips64 ||
 252            T.getArch() == Triple::mips64el)
 253     FDECFIEncoding = dwarf::DW_EH_PE_sdata8;
 254   else
 255     FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 256
 257   if (T.getArch() == Triple::x86) {
 258     PersonalityEncoding = (RelocM == Reloc::PIC_)
 259      ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
 260      : dwarf::DW_EH_PE_absptr;
 261     LSDAEncoding = (RelocM == Reloc::PIC_)
 262       ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
 263       : dwarf::DW_EH_PE_absptr;
 264     FDEEncoding = (RelocM == Reloc::PIC_)
 265       ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
 266       : dwarf::DW_EH_PE_absptr;
 267     TTypeEncoding = (RelocM == Reloc::PIC_)
 268      ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
 269      : dwarf::DW_EH_PE_absptr;
 270   } else if (T.getArch() == Triple::x86_64) {
 271     if (RelocM == Reloc::PIC_) {
 272       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 273         ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
 274          ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
 275       LSDAEncoding = dwarf::DW_EH_PE_pcrel |
 276         (CMModel == CodeModel::Small
 277          ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
 278       FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 279       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 280         ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
 281          ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
 282     } else {
 283       PersonalityEncoding =
 284         (CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
 285         ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
 286       LSDAEncoding = (CMModel == CodeModel::Small)
 287         ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
 288       FDEEncoding = dwarf::DW_EH_PE_udata4;
 289       TTypeEncoding = (CMModel == CodeModel::Small)
 290         ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
 291     }
 292   }  else if (T.getArch() ==  Triple::aarch64) {
 293     // The small model guarantees static code/data size < 4GB, but not where it
 294     // will be in memory. Most of these could end up >2GB away so even a signed
 295     // pc-relative 32-bit address is insufficient, theoretically.
 296     if (RelocM == Reloc::PIC_) {
 297       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 298         dwarf::DW_EH_PE_sdata8;
 299       LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8;
 300       FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 301       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 302         dwarf::DW_EH_PE_sdata8;
 303     } else {
 304       PersonalityEncoding = dwarf::DW_EH_PE_absptr;
 305       LSDAEncoding = dwarf::DW_EH_PE_absptr;
 306       FDEEncoding = dwarf::DW_EH_PE_udata4;
 307       TTypeEncoding = dwarf::DW_EH_PE_absptr;
 308     }
 309   } else if (T.getArch() == Triple::ppc64 || T.getArch() == Triple::ppc64le) {
 310     PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 311       dwarf::DW_EH_PE_udata8;
 312     LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
 313     FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
 314     TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 315       dwarf::DW_EH_PE_udata8;
 316   } else if (T.getArch() == Triple::sparc) {
 317     if (RelocM == Reloc::PIC_) {
 318       LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 319       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 320         dwarf::DW_EH_PE_sdata4;
 321       FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 322       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 323         dwarf::DW_EH_PE_sdata4;
 324     } else {
 325       LSDAEncoding = dwarf::DW_EH_PE_absptr;
 326       PersonalityEncoding = dwarf::DW_EH_PE_absptr;
 327       FDEEncoding = dwarf::DW_EH_PE_udata4;
 328       TTypeEncoding = dwarf::DW_EH_PE_absptr;
 329     }
 330   } else if (T.getArch() == Triple::sparcv9) {
 331     LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 332     if (RelocM == Reloc::PIC_) {
 333       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 334         dwarf::DW_EH_PE_sdata4;
 335       FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 336       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 337         dwarf::DW_EH_PE_sdata4;
 338     } else {
 339       PersonalityEncoding = dwarf::DW_EH_PE_absptr;
 340       FDEEncoding = dwarf::DW_EH_PE_udata4;
 341       TTypeEncoding = dwarf::DW_EH_PE_absptr;
 342     }
 343   } else if (T.getArch() == Triple::systemz) {
 344     // All currently-defined code models guarantee that 4-byte PC-relative
 345     // values will be in range.
 346     if (RelocM == Reloc::PIC_) {
 347       PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 348         dwarf::DW_EH_PE_sdata4;
 349       LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 350       FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
 351       TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
 352         dwarf::DW_EH_PE_sdata4;
 353     } else {
 354       PersonalityEncoding = dwarf::DW_EH_PE_absptr;
 355       LSDAEncoding = dwarf::DW_EH_PE_absptr;
 356       FDEEncoding = dwarf::DW_EH_PE_absptr;
 357       TTypeEncoding = dwarf::DW_EH_PE_absptr;
 358     }
 359   }
 360
 361   // Solaris requires different flags for .eh_frame to seemingly every other
 362   // platform.
 363   EHSectionType = ELF::SHT_PROGBITS;
 364   EHSectionFlags = ELF::SHF_ALLOC;
 365   if (T.getOS() == Triple::Solaris) {
 366     if (T.getArch() == Triple::x86_64)
 367       EHSectionType = ELF::SHT_X86_64_UNWIND;
 368     else
 369       EHSectionFlags |= ELF::SHF_WRITE;
 370   }
 371
 372
 373   // ELF
 374   BSSSection =
 375     Ctx->getELFSection(".bss", ELF::SHT_NOBITS,
 376                        ELF::SHF_WRITE | ELF::SHF_ALLOC,
 377                        SectionKind::getBSS());
 378
 379   TextSection =
 380     Ctx->getELFSection(".text", ELF::SHT_PROGBITS,
 381                        ELF::SHF_EXECINSTR |
 382                        ELF::SHF_ALLOC,
 383                        SectionKind::getText());
 384
 385   DataSection =
 386     Ctx->getELFSection(".data", ELF::SHT_PROGBITS,
 387                        ELF::SHF_WRITE |ELF::SHF_ALLOC,
 388                        SectionKind::getDataRel());
 389
 390   ReadOnlySection =
 391     Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS,
 392                        ELF::SHF_ALLOC,
 393                        SectionKind::getReadOnly());
 394
 395   TLSDataSection =
 396     Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS,
 397                        ELF::SHF_ALLOC | ELF::SHF_TLS |
 398                        ELF::SHF_WRITE,
 399                        SectionKind::getThreadData());
 400
 401   TLSBSSSection =
 402     Ctx->getELFSection(".tbss", ELF::SHT_NOBITS,
 403                        ELF::SHF_ALLOC | ELF::SHF_TLS |
 404                        ELF::SHF_WRITE,
 405                        SectionKind::getThreadBSS());
 406
 407   DataRelSection =
 408     Ctx->getELFSection(".data.rel", ELF::SHT_PROGBITS,
 409                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 410                        SectionKind::getDataRel());
 411
 412   DataRelLocalSection =
 413     Ctx->getELFSection(".data.rel.local", ELF::SHT_PROGBITS,
 414                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 415                        SectionKind::getDataRelLocal());
 416
 417   DataRelROSection =
 418     Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS,
 419                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 420                        SectionKind::getReadOnlyWithRel());
 421
 422   DataRelROLocalSection =
 423     Ctx->getELFSection(".data.rel.ro.local", ELF::SHT_PROGBITS,
 424                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 425                        SectionKind::getReadOnlyWithRelLocal());
 426
 427   MergeableConst4Section =
 428     Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS,
 429                        ELF::SHF_ALLOC |ELF::SHF_MERGE,
 430                        SectionKind::getMergeableConst4());
 431
 432   MergeableConst8Section =
 433     Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS,
 434                        ELF::SHF_ALLOC |ELF::SHF_MERGE,
 435                        SectionKind::getMergeableConst8());
 436
 437   MergeableConst16Section =
 438     Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS,
 439                        ELF::SHF_ALLOC |ELF::SHF_MERGE,
 440                        SectionKind::getMergeableConst16());
 441
 442   StaticCtorSection =
 443     Ctx->getELFSection(".ctors", ELF::SHT_PROGBITS,
 444                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 445                        SectionKind::getDataRel());
 446
 447   StaticDtorSection =
 448     Ctx->getELFSection(".dtors", ELF::SHT_PROGBITS,
 449                        ELF::SHF_ALLOC |ELF::SHF_WRITE,
 450                        SectionKind::getDataRel());
 451
 452   // Exception Handling Sections.
 453
 454   // FIXME: We're emitting LSDA info into a readonly section on ELF, even though
 455   // it contains relocatable pointers.  In PIC mode, this is probably a big
 456   // runtime hit for C++ apps.  Either the contents of the LSDA need to be
 457   // adjusted or this should be a data section.
 458   LSDASection =
 459     Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS,
 460                        ELF::SHF_ALLOC,
 461                        SectionKind::getReadOnly());
 462
 463   COFFDebugSymbolsSection = 0;
 464
 465   // Debug Info Sections.
 466   DwarfAbbrevSection =
 467     Ctx->getELFSection(".debug_abbrev", ELF::SHT_PROGBITS, 0,
 468                        SectionKind::getMetadata());
 469   DwarfInfoSection =
 470     Ctx->getELFSection(".debug_info", ELF::SHT_PROGBITS, 0,
 471                        SectionKind::getMetadata());
 472   DwarfLineSection =
 473     Ctx->getELFSection(".debug_line", ELF::SHT_PROGBITS, 0,
 474                        SectionKind::getMetadata());
 475   DwarfFrameSection =
 476     Ctx->getELFSection(".debug_frame", ELF::SHT_PROGBITS, 0,
 477                        SectionKind::getMetadata());
 478   DwarfPubNamesSection =
 479     Ctx->getELFSection(".debug_pubnames", ELF::SHT_PROGBITS, 0,
 480                        SectionKind::getMetadata());
 481   DwarfPubTypesSection =
 482     Ctx->getELFSection(".debug_pubtypes", ELF::SHT_PROGBITS, 0,
 483                        SectionKind::getMetadata());
 484   DwarfGnuPubNamesSection =
 485     Ctx->getELFSection(".debug_gnu_pubnames", ELF::SHT_PROGBITS, 0,
 486                        SectionKind::getMetadata());
 487   DwarfGnuPubTypesSection =
 488     Ctx->getELFSection(".debug_gnu_pubtypes", ELF::SHT_PROGBITS, 0,
 489                        SectionKind::getMetadata());
 490   DwarfStrSection =
 491     Ctx->getELFSection(".debug_str", ELF::SHT_PROGBITS,
 492                        ELF::SHF_MERGE | ELF::SHF_STRINGS,
 493                        SectionKind::getMergeable1ByteCString());
 494   DwarfLocSection =
 495     Ctx->getELFSection(".debug_loc", ELF::SHT_PROGBITS, 0,
 496                        SectionKind::getMetadata());
 497   DwarfARangesSection =
 498     Ctx->getELFSection(".debug_aranges", ELF::SHT_PROGBITS, 0,
 499                        SectionKind::getMetadata());
 500   DwarfRangesSection =
 501     Ctx->getELFSection(".debug_ranges", ELF::SHT_PROGBITS, 0,
 502                        SectionKind::getMetadata());
 503   DwarfMacroInfoSection =
 504     Ctx->getELFSection(".debug_macinfo", ELF::SHT_PROGBITS, 0,
 505                        SectionKind::getMetadata());
 506
 507   // DWARF5 Experimental Debug Info
 508
 509   // Accelerator Tables
 510   DwarfAccelNamesSection =
 511     Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0,
 512                        SectionKind::getMetadata());
 513   DwarfAccelObjCSection =
 514     Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0,
 515                        SectionKind::getMetadata());
 516   DwarfAccelNamespaceSection =
 517     Ctx->getELFSection(".apple_namespaces", ELF::SHT_PROGBITS, 0,
 518                        SectionKind::getMetadata());
 519   DwarfAccelTypesSection =
 520     Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0,
 521                        SectionKind::getMetadata());
 522
 523   // Fission Sections
 524   DwarfInfoDWOSection =
 525     Ctx->getELFSection(".debug_info.dwo", ELF::SHT_PROGBITS, 0,
 526                        SectionKind::getMetadata());
 527   DwarfAbbrevDWOSection =
 528     Ctx->getELFSection(".debug_abbrev.dwo", ELF::SHT_PROGBITS, 0,
 529                        SectionKind::getMetadata());
 530   DwarfStrDWOSection =
 531     Ctx->getELFSection(".debug_str.dwo", ELF::SHT_PROGBITS,
 532                        ELF::SHF_MERGE | ELF::SHF_STRINGS,
 533                        SectionKind::getMergeable1ByteCString());
 534   DwarfLineDWOSection =
 535     Ctx->getELFSection(".debug_line.dwo", ELF::SHT_PROGBITS, 0,
 536                        SectionKind::getMetadata());
 537   DwarfLocDWOSection =
 538     Ctx->getELFSection(".debug_loc.dwo", ELF::SHT_PROGBITS, 0,
 539                        SectionKind::getMetadata());
 540   DwarfStrOffDWOSection =
 541     Ctx->getELFSection(".debug_str_offsets.dwo", ELF::SHT_PROGBITS, 0,
 542                        SectionKind::getMetadata());
 543   DwarfAddrSection =
 544     Ctx->getELFSection(".debug_addr", ELF::SHT_PROGBITS, 0,
 545                        SectionKind::getMetadata());
 546 }
 547
 548
 549 void MCObjectFileInfo::InitCOFFMCObjectFileInfo(Triple T) {
 550   // COFF
 551   BSSSection =
 552     Ctx->getCOFFSection(".bss",
 553                         COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA |
 554                         COFF::IMAGE_SCN_MEM_READ |
 555                         COFF::IMAGE_SCN_MEM_WRITE,
 556                         SectionKind::getBSS());
 557   TextSection =
 558     Ctx->getCOFFSection(".text",
 559                         COFF::IMAGE_SCN_CNT_CODE |
 560                         COFF::IMAGE_SCN_MEM_EXECUTE |
 561                         COFF::IMAGE_SCN_MEM_READ,
 562                         SectionKind::getText());
 563   DataSection =
 564     Ctx->getCOFFSection(".data",
 565                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 566                         COFF::IMAGE_SCN_MEM_READ |
 567                         COFF::IMAGE_SCN_MEM_WRITE,
 568                         SectionKind::getDataRel());
 569   ReadOnlySection =
 570     Ctx->getCOFFSection(".rdata",
 571                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 572                         COFF::IMAGE_SCN_MEM_READ,
 573                         SectionKind::getReadOnly());
 574   if (T.getOS() == Triple::Win32) {
 575     StaticCtorSection =
 576       Ctx->getCOFFSection(".CRT$XCU",
 577                           COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 578                           COFF::IMAGE_SCN_MEM_READ,
 579                           SectionKind::getReadOnly());
 580   } else {
 581     StaticCtorSection =
 582       Ctx->getCOFFSection(".ctors",
 583                           COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 584                           COFF::IMAGE_SCN_MEM_READ |
 585                           COFF::IMAGE_SCN_MEM_WRITE,
 586                           SectionKind::getDataRel());
 587   }
 588
 589
 590   if (T.getOS() == Triple::Win32) {
 591     StaticDtorSection =
 592       Ctx->getCOFFSection(".CRT$XTX",
 593                           COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 594                           COFF::IMAGE_SCN_MEM_READ,
 595                           SectionKind::getReadOnly());
 596   } else {
 597     StaticDtorSection =
 598       Ctx->getCOFFSection(".dtors",
 599                           COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 600                           COFF::IMAGE_SCN_MEM_READ |
 601                           COFF::IMAGE_SCN_MEM_WRITE,
 602                           SectionKind::getDataRel());
 603   }
 604
 605   // FIXME: We're emitting LSDA info into a readonly section on COFF, even
 606   // though it contains relocatable pointers.  In PIC mode, this is probably a
 607   // big runtime hit for C++ apps.  Either the contents of the LSDA need to be
 608   // adjusted or this should be a data section.
 609   LSDASection =
 610     Ctx->getCOFFSection(".gcc_except_table",
 611                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 612                         COFF::IMAGE_SCN_MEM_READ,
 613                         SectionKind::getReadOnly());
 614
 615   // Debug info.
 616   COFFDebugSymbolsSection =
 617     Ctx->getCOFFSection(".debug$S",
 618                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 619                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 620                         COFF::IMAGE_SCN_MEM_READ,
 621                         SectionKind::getMetadata());
 622
 623   DwarfAbbrevSection =
 624     Ctx->getCOFFSection(".debug_abbrev",
 625                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 626                         COFF::IMAGE_SCN_MEM_READ,
 627                         SectionKind::getMetadata());
 628   DwarfInfoSection =
 629     Ctx->getCOFFSection(".debug_info",
 630                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 631                         COFF::IMAGE_SCN_MEM_READ,
 632                         SectionKind::getMetadata());
 633   DwarfLineSection =
 634     Ctx->getCOFFSection(".debug_line",
 635                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 636                         COFF::IMAGE_SCN_MEM_READ,
 637                         SectionKind::getMetadata());
 638   DwarfFrameSection =
 639     Ctx->getCOFFSection(".debug_frame",
 640                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 641                         COFF::IMAGE_SCN_MEM_READ,
 642                         SectionKind::getMetadata());
 643   DwarfPubNamesSection =
 644     Ctx->getCOFFSection(".debug_pubnames",
 645                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 646                         COFF::IMAGE_SCN_MEM_READ,
 647                         SectionKind::getMetadata());
 648   DwarfPubTypesSection =
 649     Ctx->getCOFFSection(".debug_pubtypes",
 650                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 651                         COFF::IMAGE_SCN_MEM_READ,
 652                         SectionKind::getMetadata());
 653   DwarfGnuPubNamesSection =
 654     Ctx->getCOFFSection(".debug_gnu_pubnames",
 655                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 656                         COFF::IMAGE_SCN_MEM_READ,
 657                         SectionKind::getMetadata());
 658   DwarfGnuPubTypesSection =
 659     Ctx->getCOFFSection(".debug_gnu_pubtypes",
 660                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 661                         COFF::IMAGE_SCN_MEM_READ,
 662                         SectionKind::getMetadata());
 663   DwarfStrSection =
 664     Ctx->getCOFFSection(".debug_str",
 665                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 666                         COFF::IMAGE_SCN_MEM_READ,
 667                         SectionKind::getMetadata());
 668   DwarfLocSection =
 669     Ctx->getCOFFSection(".debug_loc",
 670                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 671                         COFF::IMAGE_SCN_MEM_READ,
 672                         SectionKind::getMetadata());
 673   DwarfARangesSection =
 674     Ctx->getCOFFSection(".debug_aranges",
 675                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 676                         COFF::IMAGE_SCN_MEM_READ,
 677                         SectionKind::getMetadata());
 678   DwarfRangesSection =
 679     Ctx->getCOFFSection(".debug_ranges",
 680                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 681                         COFF::IMAGE_SCN_MEM_READ,
 682                         SectionKind::getMetadata());
 683   DwarfMacroInfoSection =
 684     Ctx->getCOFFSection(".debug_macinfo",
 685                         COFF::IMAGE_SCN_MEM_DISCARDABLE |
 686                         COFF::IMAGE_SCN_MEM_READ,
 687                         SectionKind::getMetadata());
 688
 689   DrectveSection =
 690     Ctx->getCOFFSection(".drectve",
 691                         COFF::IMAGE_SCN_LNK_INFO,
 692                         SectionKind::getMetadata());
 693
 694   PDataSection =
 695     Ctx->getCOFFSection(".pdata",
 696                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 697                         COFF::IMAGE_SCN_MEM_READ,
 698                         SectionKind::getDataRel());
 699
 700   XDataSection =
 701     Ctx->getCOFFSection(".xdata",
 702                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 703                         COFF::IMAGE_SCN_MEM_READ,
 704                         SectionKind::getDataRel());
 705   TLSDataSection =
 706     Ctx->getCOFFSection(".tls$",
 707                         COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 708                         COFF::IMAGE_SCN_MEM_READ |
 709                         COFF::IMAGE_SCN_MEM_WRITE,
 710                         SectionKind::getDataRel());
 711 }
 712
 713 void MCObjectFileInfo::InitMCObjectFileInfo(StringRef TT, Reloc::Model relocm,
 714                                             CodeModel::Model cm,
 715                                             MCContext &ctx) {
 716   RelocM = relocm;
 717   CMModel = cm;
 718   Ctx = &ctx;
 719
 720   // Common.
 721   CommDirectiveSupportsAlignment = true;
 722   SupportsWeakOmittedEHFrame = true;
 723   IsFunctionEHFrameSymbolPrivate = true;
 724
 725   PersonalityEncoding = LSDAEncoding = FDEEncoding = FDECFIEncoding =
 726     TTypeEncoding = dwarf::DW_EH_PE_absptr;
 727
 728   CompactUnwindDwarfEHFrameOnly = 0;
 729
 730   EHFrameSection = 0;             // Created on demand.
 731   CompactUnwindSection = 0;       // Used only by selected targets.
 732   DwarfAccelNamesSection = 0;     // Used only by selected targets.
 733   DwarfAccelObjCSection = 0;      // Used only by selected targets.
 734   DwarfAccelNamespaceSection = 0; // Used only by selected targets.
 735   DwarfAccelTypesSection = 0;     // Used only by selected targets.
 736
 737   Triple T(TT);
 738   Triple::ArchType Arch = T.getArch();
 739   // FIXME: Checking for Arch here to filter out bogus triples such as
 740   // cellspu-apple-darwin. Perhaps we should fix in Triple?
 741   if ((Arch == Triple::x86 || Arch == Triple::x86_64 ||
 742        Arch == Triple::arm || Arch == Triple::thumb ||
 743        Arch == Triple::ppc || Arch == Triple::ppc64 ||
 744        Arch == Triple::UnknownArch) &&
 745       (T.isOSDarwin() || T.getEnvironment() == Triple::MachO)) {
 746     Env = IsMachO;
 747     InitMachOMCObjectFileInfo(T);
 748   } else if ((Arch == Triple::x86 || Arch == Triple::x86_64) &&
 749              (T.getEnvironment() != Triple::ELF) &&
 750              (T.getOS() == Triple::MinGW32 || T.getOS() == Triple::Cygwin ||
 751               T.getOS() == Triple::Win32)) {
 752     Env = IsCOFF;
 753     InitCOFFMCObjectFileInfo(T);
 754   } else {
 755     Env = IsELF;
 756     InitELFMCObjectFileInfo(T);
 757   }
 758 }
 759
 760 const MCSection *MCObjectFileInfo::getDwarfTypesSection(uint64_t Hash) const {
 761   return Ctx->getELFSection(".debug_types", ELF::SHT_PROGBITS, ELF::SHF_GROUP,
 762                             SectionKind::getMetadata(), 0, utostr(Hash));
 763 }
 764
 765 const MCSection *
 766 MCObjectFileInfo::getDwarfTypesDWOSection(uint64_t Hash) const {
 767   return Ctx->getELFSection(".debug_types.dwo", ELF::SHT_PROGBITS,
 768                             ELF::SHF_GROUP, SectionKind::getMetadata(), 0,
 769                             utostr(Hash));
 770 }
 771
 772 void MCObjectFileInfo::InitEHFrameSection() {
 773   if (Env == IsMachO)
 774     EHFrameSection =
 775       Ctx->getMachOSection("__TEXT", "__eh_frame",
 776                            MCSectionMachO::S_COALESCED |
 777                            MCSectionMachO::S_ATTR_NO_TOC |
 778                            MCSectionMachO::S_ATTR_STRIP_STATIC_SYMS |
 779                            MCSectionMachO::S_ATTR_LIVE_SUPPORT,
 780                            SectionKind::getReadOnly());
 781   else if (Env == IsELF)
 782     EHFrameSection =
 783       Ctx->getELFSection(".eh_frame", EHSectionType,
 784                          EHSectionFlags,
 785                          SectionKind::getDataRel());
 786   else
 787     EHFrameSection =
 788       Ctx->getCOFFSection(".eh_frame",
 789                           COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
 790                           COFF::IMAGE_SCN_MEM_READ |
 791                           COFF::IMAGE_SCN_MEM_WRITE,
 792                           SectionKind::getDataRel());
 793 }