1 //===-- MCObjectFileInfo.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/BinaryFormat/COFF.h" 14 #include "llvm/BinaryFormat/ELF.h" 15 #include "llvm/MC/MCAsmInfo.h" 16 #include "llvm/MC/MCContext.h" 17 #include "llvm/MC/MCSection.h" 18 #include "llvm/MC/MCSectionCOFF.h" 19 #include "llvm/MC/MCSectionELF.h" 20 #include "llvm/MC/MCSectionMachO.h" 21 #include "llvm/MC/MCSectionWasm.h" 22 23 using namespace llvm; 24 25 static bool useCompactUnwind(const Triple &T) { 26 // Only on darwin. 27 if (!T.isOSDarwin()) 28 return false; 29 30 // aarch64 always has it. 31 if (T.getArch() == Triple::aarch64) 32 return true; 33 34 // armv7k always has it. 35 if (T.isWatchABI()) 36 return true; 37 38 // Use it on newer version of OS X. 39 if (T.isMacOSX() && !T.isMacOSXVersionLT(10, 6)) 40 return true; 41 42 // And the iOS simulator. 43 if (T.isiOS() && 44 (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86)) 45 return true; 46 47 return false; 48 } 49 50 void MCObjectFileInfo::initMachOMCObjectFileInfo(const Triple &T) { 51 // MachO 52 SupportsWeakOmittedEHFrame = false; 53 54 EHFrameSection = Ctx->getMachOSection( 55 "__TEXT", "__eh_frame", 56 MachO::S_COALESCED | MachO::S_ATTR_NO_TOC | 57 MachO::S_ATTR_STRIP_STATIC_SYMS | MachO::S_ATTR_LIVE_SUPPORT, 58 SectionKind::getReadOnly()); 59 60 if (T.isOSDarwin() && T.getArch() == Triple::aarch64) 61 SupportsCompactUnwindWithoutEHFrame = true; 62 63 if (T.isWatchABI()) 64 OmitDwarfIfHaveCompactUnwind = true; 65 66 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel 67 | dwarf::DW_EH_PE_sdata4; 68 LSDAEncoding = FDECFIEncoding = dwarf::DW_EH_PE_pcrel; 69 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 70 dwarf::DW_EH_PE_sdata4; 71 72 // .comm doesn't support alignment before Leopard. 73 if (T.isMacOSX() && T.isMacOSXVersionLT(10, 5)) 74 CommDirectiveSupportsAlignment = false; 75 76 TextSection // .text 77 = Ctx->getMachOSection("__TEXT", "__text", 78 MachO::S_ATTR_PURE_INSTRUCTIONS, 79 SectionKind::getText()); 80 DataSection // .data 81 = Ctx->getMachOSection("__DATA", "__data", 0, SectionKind::getData()); 82 83 // BSSSection might not be expected initialized on msvc. 84 BSSSection = nullptr; 85 86 TLSDataSection // .tdata 87 = Ctx->getMachOSection("__DATA", "__thread_data", 88 MachO::S_THREAD_LOCAL_REGULAR, 89 SectionKind::getData()); 90 TLSBSSSection // .tbss 91 = Ctx->getMachOSection("__DATA", "__thread_bss", 92 MachO::S_THREAD_LOCAL_ZEROFILL, 93 SectionKind::getThreadBSS()); 94 95 // TODO: Verify datarel below. 96 TLSTLVSection // .tlv 97 = Ctx->getMachOSection("__DATA", "__thread_vars", 98 MachO::S_THREAD_LOCAL_VARIABLES, 99 SectionKind::getData()); 100 101 TLSThreadInitSection = Ctx->getMachOSection( 102 "__DATA", "__thread_init", MachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS, 103 SectionKind::getData()); 104 105 CStringSection // .cstring 106 = Ctx->getMachOSection("__TEXT", "__cstring", 107 MachO::S_CSTRING_LITERALS, 108 SectionKind::getMergeable1ByteCString()); 109 UStringSection 110 = Ctx->getMachOSection("__TEXT","__ustring", 0, 111 SectionKind::getMergeable2ByteCString()); 112 FourByteConstantSection // .literal4 113 = Ctx->getMachOSection("__TEXT", "__literal4", 114 MachO::S_4BYTE_LITERALS, 115 SectionKind::getMergeableConst4()); 116 EightByteConstantSection // .literal8 117 = Ctx->getMachOSection("__TEXT", "__literal8", 118 MachO::S_8BYTE_LITERALS, 119 SectionKind::getMergeableConst8()); 120 121 SixteenByteConstantSection // .literal16 122 = Ctx->getMachOSection("__TEXT", "__literal16", 123 MachO::S_16BYTE_LITERALS, 124 SectionKind::getMergeableConst16()); 125 126 ReadOnlySection // .const 127 = Ctx->getMachOSection("__TEXT", "__const", 0, 128 SectionKind::getReadOnly()); 129 130 // If the target is not powerpc, map the coal sections to the non-coal 131 // sections. 132 // 133 // "__TEXT/__textcoal_nt" => section "__TEXT/__text" 134 // "__TEXT/__const_coal" => section "__TEXT/__const" 135 // "__DATA/__datacoal_nt" => section "__DATA/__data" 136 Triple::ArchType ArchTy = T.getArch(); 137 138 if (ArchTy == Triple::ppc || ArchTy == Triple::ppc64) { 139 TextCoalSection 140 = Ctx->getMachOSection("__TEXT", "__textcoal_nt", 141 MachO::S_COALESCED | 142 MachO::S_ATTR_PURE_INSTRUCTIONS, 143 SectionKind::getText()); 144 ConstTextCoalSection 145 = Ctx->getMachOSection("__TEXT", "__const_coal", 146 MachO::S_COALESCED, 147 SectionKind::getReadOnly()); 148 DataCoalSection = Ctx->getMachOSection( 149 "__DATA", "__datacoal_nt", MachO::S_COALESCED, SectionKind::getData()); 150 } else { 151 TextCoalSection = TextSection; 152 ConstTextCoalSection = ReadOnlySection; 153 DataCoalSection = DataSection; 154 } 155 156 ConstDataSection // .const_data 157 = Ctx->getMachOSection("__DATA", "__const", 0, 158 SectionKind::getReadOnlyWithRel()); 159 DataCommonSection 160 = Ctx->getMachOSection("__DATA","__common", 161 MachO::S_ZEROFILL, 162 SectionKind::getBSS()); 163 DataBSSSection 164 = Ctx->getMachOSection("__DATA","__bss", MachO::S_ZEROFILL, 165 SectionKind::getBSS()); 166 167 168 LazySymbolPointerSection 169 = Ctx->getMachOSection("__DATA", "__la_symbol_ptr", 170 MachO::S_LAZY_SYMBOL_POINTERS, 171 SectionKind::getMetadata()); 172 NonLazySymbolPointerSection 173 = Ctx->getMachOSection("__DATA", "__nl_symbol_ptr", 174 MachO::S_NON_LAZY_SYMBOL_POINTERS, 175 SectionKind::getMetadata()); 176 177 ThreadLocalPointerSection 178 = Ctx->getMachOSection("__DATA", "__thread_ptr", 179 MachO::S_THREAD_LOCAL_VARIABLE_POINTERS, 180 SectionKind::getMetadata()); 181 182 // Exception Handling. 183 LSDASection = Ctx->getMachOSection("__TEXT", "__gcc_except_tab", 0, 184 SectionKind::getReadOnlyWithRel()); 185 186 COFFDebugSymbolsSection = nullptr; 187 COFFDebugTypesSection = nullptr; 188 COFFGlobalTypeHashesSection = nullptr; 189 190 if (useCompactUnwind(T)) { 191 CompactUnwindSection = 192 Ctx->getMachOSection("__LD", "__compact_unwind", MachO::S_ATTR_DEBUG, 193 SectionKind::getReadOnly()); 194 195 if (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86) 196 CompactUnwindDwarfEHFrameOnly = 0x04000000; // UNWIND_X86_64_MODE_DWARF 197 else if (T.getArch() == Triple::aarch64) 198 CompactUnwindDwarfEHFrameOnly = 0x03000000; // UNWIND_ARM64_MODE_DWARF 199 else if (T.getArch() == Triple::arm || T.getArch() == Triple::thumb) 200 CompactUnwindDwarfEHFrameOnly = 0x04000000; // UNWIND_ARM_MODE_DWARF 201 } 202 203 // Debug Information. 204 DwarfAccelNamesSection = 205 Ctx->getMachOSection("__DWARF", "__apple_names", MachO::S_ATTR_DEBUG, 206 SectionKind::getMetadata(), "names_begin"); 207 DwarfAccelObjCSection = 208 Ctx->getMachOSection("__DWARF", "__apple_objc", MachO::S_ATTR_DEBUG, 209 SectionKind::getMetadata(), "objc_begin"); 210 // 16 character section limit... 211 DwarfAccelNamespaceSection = 212 Ctx->getMachOSection("__DWARF", "__apple_namespac", MachO::S_ATTR_DEBUG, 213 SectionKind::getMetadata(), "namespac_begin"); 214 DwarfAccelTypesSection = 215 Ctx->getMachOSection("__DWARF", "__apple_types", MachO::S_ATTR_DEBUG, 216 SectionKind::getMetadata(), "types_begin"); 217 218 DwarfSwiftASTSection = 219 Ctx->getMachOSection("__DWARF", "__swift_ast", MachO::S_ATTR_DEBUG, 220 SectionKind::getMetadata()); 221 222 DwarfAbbrevSection = 223 Ctx->getMachOSection("__DWARF", "__debug_abbrev", MachO::S_ATTR_DEBUG, 224 SectionKind::getMetadata(), "section_abbrev"); 225 DwarfInfoSection = 226 Ctx->getMachOSection("__DWARF", "__debug_info", MachO::S_ATTR_DEBUG, 227 SectionKind::getMetadata(), "section_info"); 228 DwarfLineSection = 229 Ctx->getMachOSection("__DWARF", "__debug_line", MachO::S_ATTR_DEBUG, 230 SectionKind::getMetadata(), "section_line"); 231 DwarfFrameSection = 232 Ctx->getMachOSection("__DWARF", "__debug_frame", MachO::S_ATTR_DEBUG, 233 SectionKind::getMetadata()); 234 DwarfPubNamesSection = 235 Ctx->getMachOSection("__DWARF", "__debug_pubnames", MachO::S_ATTR_DEBUG, 236 SectionKind::getMetadata()); 237 DwarfPubTypesSection = 238 Ctx->getMachOSection("__DWARF", "__debug_pubtypes", MachO::S_ATTR_DEBUG, 239 SectionKind::getMetadata()); 240 DwarfGnuPubNamesSection = 241 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubn", MachO::S_ATTR_DEBUG, 242 SectionKind::getMetadata()); 243 DwarfGnuPubTypesSection = 244 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubt", MachO::S_ATTR_DEBUG, 245 SectionKind::getMetadata()); 246 DwarfStrSection = 247 Ctx->getMachOSection("__DWARF", "__debug_str", MachO::S_ATTR_DEBUG, 248 SectionKind::getMetadata(), "info_string"); 249 DwarfStrOffSection = 250 Ctx->getMachOSection("__DWARF", "__debug_str_offs", MachO::S_ATTR_DEBUG, 251 SectionKind::getMetadata(), "section_str_off"); 252 DwarfLocSection = 253 Ctx->getMachOSection("__DWARF", "__debug_loc", MachO::S_ATTR_DEBUG, 254 SectionKind::getMetadata(), "section_debug_loc"); 255 DwarfARangesSection = 256 Ctx->getMachOSection("__DWARF", "__debug_aranges", MachO::S_ATTR_DEBUG, 257 SectionKind::getMetadata()); 258 DwarfRangesSection = 259 Ctx->getMachOSection("__DWARF", "__debug_ranges", MachO::S_ATTR_DEBUG, 260 SectionKind::getMetadata(), "debug_range"); 261 DwarfMacinfoSection = 262 Ctx->getMachOSection("__DWARF", "__debug_macinfo", MachO::S_ATTR_DEBUG, 263 SectionKind::getMetadata(), "debug_macinfo"); 264 DwarfDebugInlineSection = 265 Ctx->getMachOSection("__DWARF", "__debug_inlined", MachO::S_ATTR_DEBUG, 266 SectionKind::getMetadata()); 267 DwarfCUIndexSection = 268 Ctx->getMachOSection("__DWARF", "__debug_cu_index", MachO::S_ATTR_DEBUG, 269 SectionKind::getMetadata()); 270 DwarfTUIndexSection = 271 Ctx->getMachOSection("__DWARF", "__debug_tu_index", MachO::S_ATTR_DEBUG, 272 SectionKind::getMetadata()); 273 StackMapSection = Ctx->getMachOSection("__LLVM_STACKMAPS", "__llvm_stackmaps", 274 0, SectionKind::getMetadata()); 275 276 FaultMapSection = Ctx->getMachOSection("__LLVM_FAULTMAPS", "__llvm_faultmaps", 277 0, SectionKind::getMetadata()); 278 279 TLSExtraDataSection = TLSTLVSection; 280 } 281 282 void MCObjectFileInfo::initELFMCObjectFileInfo(const Triple &T, bool Large) { 283 switch (T.getArch()) { 284 case Triple::mips: 285 case Triple::mipsel: 286 FDECFIEncoding = dwarf::DW_EH_PE_sdata4; 287 break; 288 case Triple::mips64: 289 case Triple::mips64el: 290 FDECFIEncoding = dwarf::DW_EH_PE_sdata8; 291 break; 292 case Triple::ppc64: 293 case Triple::ppc64le: 294 case Triple::x86_64: 295 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | 296 (Large ? dwarf::DW_EH_PE_sdata8 : dwarf::DW_EH_PE_sdata4); 297 break; 298 case Triple::bpfel: 299 case Triple::bpfeb: 300 FDECFIEncoding = dwarf::DW_EH_PE_sdata8; 301 break; 302 default: 303 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 304 break; 305 } 306 307 switch (T.getArch()) { 308 case Triple::arm: 309 case Triple::armeb: 310 case Triple::thumb: 311 case Triple::thumbeb: 312 if (Ctx->getAsmInfo()->getExceptionHandlingType() == ExceptionHandling::ARM) 313 break; 314 // Fallthrough if not using EHABI 315 LLVM_FALLTHROUGH; 316 case Triple::ppc: 317 case Triple::x86: 318 PersonalityEncoding = PositionIndependent 319 ? dwarf::DW_EH_PE_indirect | 320 dwarf::DW_EH_PE_pcrel | 321 dwarf::DW_EH_PE_sdata4 322 : dwarf::DW_EH_PE_absptr; 323 LSDAEncoding = PositionIndependent 324 ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4 325 : dwarf::DW_EH_PE_absptr; 326 TTypeEncoding = PositionIndependent 327 ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 328 dwarf::DW_EH_PE_sdata4 329 : dwarf::DW_EH_PE_absptr; 330 break; 331 case Triple::x86_64: 332 if (PositionIndependent) { 333 PersonalityEncoding = 334 dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 335 (Large ? dwarf::DW_EH_PE_sdata8 : dwarf::DW_EH_PE_sdata4); 336 LSDAEncoding = dwarf::DW_EH_PE_pcrel | 337 (Large ? dwarf::DW_EH_PE_sdata8 : dwarf::DW_EH_PE_sdata4); 338 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 339 (Large ? dwarf::DW_EH_PE_sdata8 : dwarf::DW_EH_PE_sdata4); 340 } else { 341 PersonalityEncoding = 342 Large ? dwarf::DW_EH_PE_absptr : dwarf::DW_EH_PE_udata4; 343 LSDAEncoding = Large ? dwarf::DW_EH_PE_absptr : dwarf::DW_EH_PE_udata4; 344 TTypeEncoding = Large ? dwarf::DW_EH_PE_absptr : dwarf::DW_EH_PE_udata4; 345 } 346 break; 347 case Triple::hexagon: 348 PersonalityEncoding = dwarf::DW_EH_PE_absptr; 349 LSDAEncoding = dwarf::DW_EH_PE_absptr; 350 FDECFIEncoding = dwarf::DW_EH_PE_absptr; 351 TTypeEncoding = dwarf::DW_EH_PE_absptr; 352 if (PositionIndependent) { 353 PersonalityEncoding |= dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel; 354 LSDAEncoding |= dwarf::DW_EH_PE_pcrel; 355 FDECFIEncoding |= dwarf::DW_EH_PE_pcrel; 356 TTypeEncoding |= dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel; 357 } 358 break; 359 case Triple::aarch64: 360 case Triple::aarch64_be: 361 // The small model guarantees static code/data size < 4GB, but not where it 362 // will be in memory. Most of these could end up >2GB away so even a signed 363 // pc-relative 32-bit address is insufficient, theoretically. 364 if (PositionIndependent) { 365 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 366 dwarf::DW_EH_PE_sdata8; 367 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8; 368 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 369 dwarf::DW_EH_PE_sdata8; 370 } else { 371 PersonalityEncoding = dwarf::DW_EH_PE_absptr; 372 LSDAEncoding = dwarf::DW_EH_PE_absptr; 373 TTypeEncoding = dwarf::DW_EH_PE_absptr; 374 } 375 break; 376 case Triple::lanai: 377 LSDAEncoding = dwarf::DW_EH_PE_absptr; 378 PersonalityEncoding = dwarf::DW_EH_PE_absptr; 379 TTypeEncoding = dwarf::DW_EH_PE_absptr; 380 break; 381 case Triple::mips: 382 case Triple::mipsel: 383 case Triple::mips64: 384 case Triple::mips64el: 385 // MIPS uses indirect pointer to refer personality functions and types, so 386 // that the eh_frame section can be read-only. DW.ref.personality will be 387 // generated for relocation. 388 PersonalityEncoding = dwarf::DW_EH_PE_indirect; 389 // FIXME: The N64 ABI probably ought to use DW_EH_PE_sdata8 but we can't 390 // identify N64 from just a triple. 391 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 392 dwarf::DW_EH_PE_sdata4; 393 // We don't support PC-relative LSDA references in GAS so we use the default 394 // DW_EH_PE_absptr for those. 395 396 // FreeBSD must be explicit about the data size and using pcrel since it's 397 // assembler/linker won't do the automatic conversion that the Linux tools 398 // do. 399 if (T.isOSFreeBSD()) { 400 PersonalityEncoding |= dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 401 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 402 } 403 break; 404 case Triple::ppc64: 405 case Triple::ppc64le: 406 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 407 dwarf::DW_EH_PE_udata8; 408 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8; 409 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 410 dwarf::DW_EH_PE_udata8; 411 break; 412 case Triple::sparcel: 413 case Triple::sparc: 414 if (PositionIndependent) { 415 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 416 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 417 dwarf::DW_EH_PE_sdata4; 418 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 419 dwarf::DW_EH_PE_sdata4; 420 } else { 421 LSDAEncoding = dwarf::DW_EH_PE_absptr; 422 PersonalityEncoding = dwarf::DW_EH_PE_absptr; 423 TTypeEncoding = dwarf::DW_EH_PE_absptr; 424 } 425 break; 426 case Triple::sparcv9: 427 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 428 if (PositionIndependent) { 429 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 430 dwarf::DW_EH_PE_sdata4; 431 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 432 dwarf::DW_EH_PE_sdata4; 433 } else { 434 PersonalityEncoding = dwarf::DW_EH_PE_absptr; 435 TTypeEncoding = dwarf::DW_EH_PE_absptr; 436 } 437 break; 438 case Triple::systemz: 439 // All currently-defined code models guarantee that 4-byte PC-relative 440 // values will be in range. 441 if (PositionIndependent) { 442 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 443 dwarf::DW_EH_PE_sdata4; 444 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 445 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 446 dwarf::DW_EH_PE_sdata4; 447 } else { 448 PersonalityEncoding = dwarf::DW_EH_PE_absptr; 449 LSDAEncoding = dwarf::DW_EH_PE_absptr; 450 TTypeEncoding = dwarf::DW_EH_PE_absptr; 451 } 452 break; 453 default: 454 break; 455 } 456 457 unsigned EHSectionType = T.getArch() == Triple::x86_64 458 ? ELF::SHT_X86_64_UNWIND 459 : ELF::SHT_PROGBITS; 460 461 // Solaris requires different flags for .eh_frame to seemingly every other 462 // platform. 463 unsigned EHSectionFlags = ELF::SHF_ALLOC; 464 if (T.isOSSolaris() && T.getArch() != Triple::x86_64) 465 EHSectionFlags |= ELF::SHF_WRITE; 466 467 // ELF 468 BSSSection = Ctx->getELFSection(".bss", ELF::SHT_NOBITS, 469 ELF::SHF_WRITE | ELF::SHF_ALLOC); 470 471 TextSection = Ctx->getELFSection(".text", ELF::SHT_PROGBITS, 472 ELF::SHF_EXECINSTR | ELF::SHF_ALLOC); 473 474 DataSection = Ctx->getELFSection(".data", ELF::SHT_PROGBITS, 475 ELF::SHF_WRITE | ELF::SHF_ALLOC); 476 477 ReadOnlySection = 478 Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); 479 480 TLSDataSection = 481 Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS, 482 ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE); 483 484 TLSBSSSection = Ctx->getELFSection( 485 ".tbss", ELF::SHT_NOBITS, ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE); 486 487 DataRelROSection = Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS, 488 ELF::SHF_ALLOC | ELF::SHF_WRITE); 489 490 MergeableConst4Section = 491 Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS, 492 ELF::SHF_ALLOC | ELF::SHF_MERGE, 4, ""); 493 494 MergeableConst8Section = 495 Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS, 496 ELF::SHF_ALLOC | ELF::SHF_MERGE, 8, ""); 497 498 MergeableConst16Section = 499 Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS, 500 ELF::SHF_ALLOC | ELF::SHF_MERGE, 16, ""); 501 502 MergeableConst32Section = 503 Ctx->getELFSection(".rodata.cst32", ELF::SHT_PROGBITS, 504 ELF::SHF_ALLOC | ELF::SHF_MERGE, 32, ""); 505 506 // Exception Handling Sections. 507 508 // FIXME: We're emitting LSDA info into a readonly section on ELF, even though 509 // it contains relocatable pointers. In PIC mode, this is probably a big 510 // runtime hit for C++ apps. Either the contents of the LSDA need to be 511 // adjusted or this should be a data section. 512 LSDASection = Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS, 513 ELF::SHF_ALLOC); 514 515 COFFDebugSymbolsSection = nullptr; 516 COFFDebugTypesSection = nullptr; 517 518 unsigned DebugSecType = ELF::SHT_PROGBITS; 519 520 // MIPS .debug_* sections should have SHT_MIPS_DWARF section type 521 // to distinguish among sections contain DWARF and ECOFF debug formats. 522 // Sections with ECOFF debug format are obsoleted and marked by SHT_PROGBITS. 523 if (T.getArch() == Triple::mips || T.getArch() == Triple::mipsel || 524 T.getArch() == Triple::mips64 || T.getArch() == Triple::mips64el) 525 DebugSecType = ELF::SHT_MIPS_DWARF; 526 527 // Debug Info Sections. 528 DwarfAbbrevSection = 529 Ctx->getELFSection(".debug_abbrev", DebugSecType, 0); 530 DwarfInfoSection = Ctx->getELFSection(".debug_info", DebugSecType, 0); 531 DwarfLineSection = Ctx->getELFSection(".debug_line", DebugSecType, 0); 532 DwarfFrameSection = Ctx->getELFSection(".debug_frame", DebugSecType, 0); 533 DwarfPubNamesSection = 534 Ctx->getELFSection(".debug_pubnames", DebugSecType, 0); 535 DwarfPubTypesSection = 536 Ctx->getELFSection(".debug_pubtypes", DebugSecType, 0); 537 DwarfGnuPubNamesSection = 538 Ctx->getELFSection(".debug_gnu_pubnames", DebugSecType, 0); 539 DwarfGnuPubTypesSection = 540 Ctx->getELFSection(".debug_gnu_pubtypes", DebugSecType, 0); 541 DwarfStrSection = 542 Ctx->getELFSection(".debug_str", DebugSecType, 543 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, ""); 544 DwarfLocSection = Ctx->getELFSection(".debug_loc", DebugSecType, 0); 545 DwarfARangesSection = 546 Ctx->getELFSection(".debug_aranges", DebugSecType, 0); 547 DwarfRangesSection = 548 Ctx->getELFSection(".debug_ranges", DebugSecType, 0); 549 DwarfMacinfoSection = 550 Ctx->getELFSection(".debug_macinfo", DebugSecType, 0); 551 552 // DWARF5 Experimental Debug Info 553 554 // Accelerator Tables 555 DwarfAccelNamesSection = 556 Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0); 557 DwarfAccelObjCSection = 558 Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0); 559 DwarfAccelNamespaceSection = 560 Ctx->getELFSection(".apple_namespaces", ELF::SHT_PROGBITS, 0); 561 DwarfAccelTypesSection = 562 Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0); 563 564 // String Offset and Address Sections 565 DwarfStrOffSection = 566 Ctx->getELFSection(".debug_str_offsets", DebugSecType, 0); 567 DwarfAddrSection = Ctx->getELFSection(".debug_addr", DebugSecType, 0); 568 569 // Fission Sections 570 DwarfInfoDWOSection = 571 Ctx->getELFSection(".debug_info.dwo", DebugSecType, 0); 572 DwarfTypesDWOSection = 573 Ctx->getELFSection(".debug_types.dwo", DebugSecType, 0); 574 DwarfAbbrevDWOSection = 575 Ctx->getELFSection(".debug_abbrev.dwo", DebugSecType, 0); 576 DwarfStrDWOSection = 577 Ctx->getELFSection(".debug_str.dwo", DebugSecType, 578 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, ""); 579 DwarfLineDWOSection = 580 Ctx->getELFSection(".debug_line.dwo", DebugSecType, 0); 581 DwarfLocDWOSection = 582 Ctx->getELFSection(".debug_loc.dwo", DebugSecType, 0); 583 DwarfStrOffDWOSection = 584 Ctx->getELFSection(".debug_str_offsets.dwo", DebugSecType, 0); 585 586 // DWP Sections 587 DwarfCUIndexSection = 588 Ctx->getELFSection(".debug_cu_index", DebugSecType, 0); 589 DwarfTUIndexSection = 590 Ctx->getELFSection(".debug_tu_index", DebugSecType, 0); 591 592 StackMapSection = 593 Ctx->getELFSection(".llvm_stackmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); 594 595 FaultMapSection = 596 Ctx->getELFSection(".llvm_faultmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); 597 598 EHFrameSection = 599 Ctx->getELFSection(".eh_frame", EHSectionType, EHSectionFlags); 600 601 StackSizesSection = Ctx->getELFSection(".stack_sizes", ELF::SHT_PROGBITS, 0); 602 } 603 604 void MCObjectFileInfo::initCOFFMCObjectFileInfo(const Triple &T) { 605 EHFrameSection = Ctx->getCOFFSection( 606 ".eh_frame", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 607 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE, 608 SectionKind::getData()); 609 610 // Set the `IMAGE_SCN_MEM_16BIT` flag when compiling for thumb mode. This is 611 // used to indicate to the linker that the text segment contains thumb instructions 612 // and to set the ISA selection bit for calls accordingly. 613 const bool IsThumb = T.getArch() == Triple::thumb; 614 615 CommDirectiveSupportsAlignment = true; 616 617 // COFF 618 BSSSection = Ctx->getCOFFSection( 619 ".bss", COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA | 620 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE, 621 SectionKind::getBSS()); 622 TextSection = Ctx->getCOFFSection( 623 ".text", 624 (IsThumb ? COFF::IMAGE_SCN_MEM_16BIT : (COFF::SectionCharacteristics)0) | 625 COFF::IMAGE_SCN_CNT_CODE | COFF::IMAGE_SCN_MEM_EXECUTE | 626 COFF::IMAGE_SCN_MEM_READ, 627 SectionKind::getText()); 628 DataSection = Ctx->getCOFFSection( 629 ".data", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ | 630 COFF::IMAGE_SCN_MEM_WRITE, 631 SectionKind::getData()); 632 ReadOnlySection = Ctx->getCOFFSection( 633 ".rdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, 634 SectionKind::getReadOnly()); 635 636 // FIXME: We're emitting LSDA info into a readonly section on COFF, even 637 // though it contains relocatable pointers. In PIC mode, this is probably a 638 // big runtime hit for C++ apps. Either the contents of the LSDA need to be 639 // adjusted or this should be a data section. 640 if (T.getArch() == Triple::x86_64) { 641 // On Windows 64 with SEH, the LSDA is emitted into the .xdata section 642 LSDASection = nullptr; 643 } else { 644 LSDASection = Ctx->getCOFFSection(".gcc_except_table", 645 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 646 COFF::IMAGE_SCN_MEM_READ, 647 SectionKind::getReadOnly()); 648 } 649 650 // Debug info. 651 COFFDebugSymbolsSection = 652 Ctx->getCOFFSection(".debug$S", (COFF::IMAGE_SCN_MEM_DISCARDABLE | 653 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 654 COFF::IMAGE_SCN_MEM_READ), 655 SectionKind::getMetadata()); 656 COFFDebugTypesSection = 657 Ctx->getCOFFSection(".debug$T", (COFF::IMAGE_SCN_MEM_DISCARDABLE | 658 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 659 COFF::IMAGE_SCN_MEM_READ), 660 SectionKind::getMetadata()); 661 COFFGlobalTypeHashesSection = Ctx->getCOFFSection( 662 ".debug$H", 663 (COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 664 COFF::IMAGE_SCN_MEM_READ), 665 SectionKind::getMetadata()); 666 667 DwarfAbbrevSection = Ctx->getCOFFSection( 668 ".debug_abbrev", 669 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 670 COFF::IMAGE_SCN_MEM_READ, 671 SectionKind::getMetadata(), "section_abbrev"); 672 DwarfInfoSection = Ctx->getCOFFSection( 673 ".debug_info", 674 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 675 COFF::IMAGE_SCN_MEM_READ, 676 SectionKind::getMetadata(), "section_info"); 677 DwarfLineSection = Ctx->getCOFFSection( 678 ".debug_line", 679 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 680 COFF::IMAGE_SCN_MEM_READ, 681 SectionKind::getMetadata(), "section_line"); 682 683 DwarfFrameSection = Ctx->getCOFFSection( 684 ".debug_frame", 685 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 686 COFF::IMAGE_SCN_MEM_READ, 687 SectionKind::getMetadata()); 688 DwarfPubNamesSection = Ctx->getCOFFSection( 689 ".debug_pubnames", 690 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 691 COFF::IMAGE_SCN_MEM_READ, 692 SectionKind::getMetadata()); 693 DwarfPubTypesSection = Ctx->getCOFFSection( 694 ".debug_pubtypes", 695 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 696 COFF::IMAGE_SCN_MEM_READ, 697 SectionKind::getMetadata()); 698 DwarfGnuPubNamesSection = Ctx->getCOFFSection( 699 ".debug_gnu_pubnames", 700 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 701 COFF::IMAGE_SCN_MEM_READ, 702 SectionKind::getMetadata()); 703 DwarfGnuPubTypesSection = Ctx->getCOFFSection( 704 ".debug_gnu_pubtypes", 705 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 706 COFF::IMAGE_SCN_MEM_READ, 707 SectionKind::getMetadata()); 708 DwarfStrSection = Ctx->getCOFFSection( 709 ".debug_str", 710 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 711 COFF::IMAGE_SCN_MEM_READ, 712 SectionKind::getMetadata(), "info_string"); 713 DwarfStrOffSection = Ctx->getCOFFSection( 714 ".debug_str_offsets", 715 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 716 COFF::IMAGE_SCN_MEM_READ, 717 SectionKind::getMetadata(), "section_str_off"); 718 DwarfLocSection = Ctx->getCOFFSection( 719 ".debug_loc", 720 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 721 COFF::IMAGE_SCN_MEM_READ, 722 SectionKind::getMetadata(), "section_debug_loc"); 723 DwarfARangesSection = Ctx->getCOFFSection( 724 ".debug_aranges", 725 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 726 COFF::IMAGE_SCN_MEM_READ, 727 SectionKind::getMetadata()); 728 DwarfRangesSection = Ctx->getCOFFSection( 729 ".debug_ranges", 730 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 731 COFF::IMAGE_SCN_MEM_READ, 732 SectionKind::getMetadata(), "debug_range"); 733 DwarfMacinfoSection = Ctx->getCOFFSection( 734 ".debug_macinfo", 735 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 736 COFF::IMAGE_SCN_MEM_READ, 737 SectionKind::getMetadata(), "debug_macinfo"); 738 DwarfInfoDWOSection = Ctx->getCOFFSection( 739 ".debug_info.dwo", 740 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 741 COFF::IMAGE_SCN_MEM_READ, 742 SectionKind::getMetadata(), "section_info_dwo"); 743 DwarfTypesDWOSection = Ctx->getCOFFSection( 744 ".debug_types.dwo", 745 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 746 COFF::IMAGE_SCN_MEM_READ, 747 SectionKind::getMetadata(), "section_types_dwo"); 748 DwarfAbbrevDWOSection = Ctx->getCOFFSection( 749 ".debug_abbrev.dwo", 750 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 751 COFF::IMAGE_SCN_MEM_READ, 752 SectionKind::getMetadata(), "section_abbrev_dwo"); 753 DwarfStrDWOSection = Ctx->getCOFFSection( 754 ".debug_str.dwo", 755 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 756 COFF::IMAGE_SCN_MEM_READ, 757 SectionKind::getMetadata(), "skel_string"); 758 DwarfLineDWOSection = Ctx->getCOFFSection( 759 ".debug_line.dwo", 760 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 761 COFF::IMAGE_SCN_MEM_READ, 762 SectionKind::getMetadata()); 763 DwarfLocDWOSection = Ctx->getCOFFSection( 764 ".debug_loc.dwo", 765 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 766 COFF::IMAGE_SCN_MEM_READ, 767 SectionKind::getMetadata(), "skel_loc"); 768 DwarfStrOffDWOSection = Ctx->getCOFFSection( 769 ".debug_str_offsets.dwo", 770 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 771 COFF::IMAGE_SCN_MEM_READ, 772 SectionKind::getMetadata(), "section_str_off_dwo"); 773 DwarfAddrSection = Ctx->getCOFFSection( 774 ".debug_addr", 775 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 776 COFF::IMAGE_SCN_MEM_READ, 777 SectionKind::getMetadata(), "addr_sec"); 778 DwarfCUIndexSection = Ctx->getCOFFSection( 779 ".debug_cu_index", 780 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 781 COFF::IMAGE_SCN_MEM_READ, 782 SectionKind::getMetadata()); 783 DwarfTUIndexSection = Ctx->getCOFFSection( 784 ".debug_tu_index", 785 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 786 COFF::IMAGE_SCN_MEM_READ, 787 SectionKind::getMetadata()); 788 DwarfAccelNamesSection = Ctx->getCOFFSection( 789 ".apple_names", 790 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 791 COFF::IMAGE_SCN_MEM_READ, 792 SectionKind::getMetadata(), "names_begin"); 793 DwarfAccelNamespaceSection = Ctx->getCOFFSection( 794 ".apple_namespaces", 795 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 796 COFF::IMAGE_SCN_MEM_READ, 797 SectionKind::getMetadata(), "namespac_begin"); 798 DwarfAccelTypesSection = Ctx->getCOFFSection( 799 ".apple_types", 800 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 801 COFF::IMAGE_SCN_MEM_READ, 802 SectionKind::getMetadata(), "types_begin"); 803 DwarfAccelObjCSection = Ctx->getCOFFSection( 804 ".apple_objc", 805 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 806 COFF::IMAGE_SCN_MEM_READ, 807 SectionKind::getMetadata(), "objc_begin"); 808 809 DrectveSection = Ctx->getCOFFSection( 810 ".drectve", COFF::IMAGE_SCN_LNK_INFO | COFF::IMAGE_SCN_LNK_REMOVE, 811 SectionKind::getMetadata()); 812 813 PDataSection = Ctx->getCOFFSection( 814 ".pdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, 815 SectionKind::getData()); 816 817 XDataSection = Ctx->getCOFFSection( 818 ".xdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, 819 SectionKind::getData()); 820 821 SXDataSection = Ctx->getCOFFSection(".sxdata", COFF::IMAGE_SCN_LNK_INFO, 822 SectionKind::getMetadata()); 823 824 TLSDataSection = Ctx->getCOFFSection( 825 ".tls$", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ | 826 COFF::IMAGE_SCN_MEM_WRITE, 827 SectionKind::getData()); 828 829 StackMapSection = Ctx->getCOFFSection(".llvm_stackmaps", 830 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 831 COFF::IMAGE_SCN_MEM_READ, 832 SectionKind::getReadOnly()); 833 } 834 835 void MCObjectFileInfo::initWasmMCObjectFileInfo(const Triple &T) { 836 // TODO: Set the section types and flags. 837 TextSection = Ctx->getWasmSection(".text", SectionKind::getText()); 838 DataSection = Ctx->getWasmSection(".data", SectionKind::getData()); 839 840 // TODO: Set the section types and flags. 841 DwarfLineSection = Ctx->getWasmSection(".debug_line", SectionKind::getMetadata()); 842 DwarfStrSection = Ctx->getWasmSection(".debug_str", SectionKind::getMetadata()); 843 DwarfLocSection = Ctx->getWasmSection(".debug_loc", SectionKind::getMetadata()); 844 DwarfAbbrevSection = Ctx->getWasmSection(".debug_abbrev", SectionKind::getMetadata(), "section_abbrev"); 845 DwarfARangesSection = Ctx->getWasmSection(".debug_aranges", SectionKind::getMetadata()); 846 DwarfRangesSection = Ctx->getWasmSection(".debug_ranges", SectionKind::getMetadata(), "debug_range"); 847 DwarfMacinfoSection = Ctx->getWasmSection(".debug_macinfo", SectionKind::getMetadata(), "debug_macinfo"); 848 DwarfAddrSection = Ctx->getWasmSection(".debug_addr", SectionKind::getMetadata()); 849 DwarfCUIndexSection = Ctx->getWasmSection(".debug_cu_index", SectionKind::getMetadata()); 850 DwarfTUIndexSection = Ctx->getWasmSection(".debug_tu_index", SectionKind::getMetadata()); 851 DwarfInfoSection = Ctx->getWasmSection(".debug_info", SectionKind::getMetadata(), "section_info"); 852 DwarfFrameSection = Ctx->getWasmSection(".debug_frame", SectionKind::getMetadata()); 853 DwarfPubNamesSection = Ctx->getWasmSection(".debug_pubnames", SectionKind::getMetadata()); 854 DwarfPubTypesSection = Ctx->getWasmSection(".debug_pubtypes", SectionKind::getMetadata()); 855 856 // TODO: Define more sections. 857 } 858 859 void MCObjectFileInfo::InitMCObjectFileInfo(const Triple &TheTriple, bool PIC, 860 MCContext &ctx, 861 bool LargeCodeModel) { 862 PositionIndependent = PIC; 863 Ctx = &ctx; 864 865 // Common. 866 CommDirectiveSupportsAlignment = true; 867 SupportsWeakOmittedEHFrame = true; 868 SupportsCompactUnwindWithoutEHFrame = false; 869 OmitDwarfIfHaveCompactUnwind = false; 870 871 PersonalityEncoding = LSDAEncoding = FDECFIEncoding = TTypeEncoding = 872 dwarf::DW_EH_PE_absptr; 873 874 CompactUnwindDwarfEHFrameOnly = 0; 875 876 EHFrameSection = nullptr; // Created on demand. 877 CompactUnwindSection = nullptr; // Used only by selected targets. 878 DwarfAccelNamesSection = nullptr; // Used only by selected targets. 879 DwarfAccelObjCSection = nullptr; // Used only by selected targets. 880 DwarfAccelNamespaceSection = nullptr; // Used only by selected targets. 881 DwarfAccelTypesSection = nullptr; // Used only by selected targets. 882 883 TT = TheTriple; 884 885 switch (TT.getObjectFormat()) { 886 case Triple::MachO: 887 Env = IsMachO; 888 initMachOMCObjectFileInfo(TT); 889 break; 890 case Triple::COFF: 891 if (!TT.isOSWindows()) 892 report_fatal_error( 893 "Cannot initialize MC for non-Windows COFF object files."); 894 895 Env = IsCOFF; 896 initCOFFMCObjectFileInfo(TT); 897 break; 898 case Triple::ELF: 899 Env = IsELF; 900 initELFMCObjectFileInfo(TT, LargeCodeModel); 901 break; 902 case Triple::Wasm: 903 Env = IsWasm; 904 initWasmMCObjectFileInfo(TT); 905 break; 906 case Triple::UnknownObjectFormat: 907 report_fatal_error("Cannot initialize MC for unknown object file format."); 908 break; 909 } 910 } 911 912 MCSection *MCObjectFileInfo::getDwarfTypesSection(uint64_t Hash) const { 913 return Ctx->getELFSection(".debug_types", ELF::SHT_PROGBITS, ELF::SHF_GROUP, 914 0, utostr(Hash)); 915 } 916