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