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