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::x86_64: 293 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | 294 (Large ? dwarf::DW_EH_PE_sdata8 : dwarf::DW_EH_PE_sdata4); 295 break; 296 case Triple::bpfel: 297 case Triple::bpfeb: 298 FDECFIEncoding = dwarf::DW_EH_PE_sdata8; 299 break; 300 default: 301 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 302 break; 303 } 304 305 switch (T.getArch()) { 306 case Triple::arm: 307 case Triple::armeb: 308 case Triple::thumb: 309 case Triple::thumbeb: 310 if (Ctx->getAsmInfo()->getExceptionHandlingType() == ExceptionHandling::ARM) 311 break; 312 // Fallthrough if not using EHABI 313 LLVM_FALLTHROUGH; 314 case Triple::ppc: 315 case Triple::x86: 316 PersonalityEncoding = PositionIndependent 317 ? dwarf::DW_EH_PE_indirect | 318 dwarf::DW_EH_PE_pcrel | 319 dwarf::DW_EH_PE_sdata4 320 : dwarf::DW_EH_PE_absptr; 321 LSDAEncoding = PositionIndependent 322 ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4 323 : dwarf::DW_EH_PE_absptr; 324 TTypeEncoding = PositionIndependent 325 ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 326 dwarf::DW_EH_PE_sdata4 327 : dwarf::DW_EH_PE_absptr; 328 break; 329 case Triple::x86_64: 330 if (PositionIndependent) { 331 PersonalityEncoding = 332 dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 333 (Large ? dwarf::DW_EH_PE_sdata8 : dwarf::DW_EH_PE_sdata4); 334 LSDAEncoding = dwarf::DW_EH_PE_pcrel | 335 (Large ? dwarf::DW_EH_PE_sdata8 : dwarf::DW_EH_PE_sdata4); 336 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 337 (Large ? dwarf::DW_EH_PE_sdata8 : dwarf::DW_EH_PE_sdata4); 338 } else { 339 PersonalityEncoding = 340 Large ? dwarf::DW_EH_PE_absptr : dwarf::DW_EH_PE_udata4; 341 LSDAEncoding = Large ? dwarf::DW_EH_PE_absptr : dwarf::DW_EH_PE_udata4; 342 TTypeEncoding = Large ? dwarf::DW_EH_PE_absptr : dwarf::DW_EH_PE_udata4; 343 } 344 break; 345 case Triple::hexagon: 346 PersonalityEncoding = dwarf::DW_EH_PE_absptr; 347 LSDAEncoding = dwarf::DW_EH_PE_absptr; 348 FDECFIEncoding = dwarf::DW_EH_PE_absptr; 349 TTypeEncoding = dwarf::DW_EH_PE_absptr; 350 if (PositionIndependent) { 351 PersonalityEncoding |= dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel; 352 LSDAEncoding |= dwarf::DW_EH_PE_pcrel; 353 FDECFIEncoding |= dwarf::DW_EH_PE_pcrel; 354 TTypeEncoding |= dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel; 355 } 356 break; 357 case Triple::aarch64: 358 case Triple::aarch64_be: 359 // The small model guarantees static code/data size < 4GB, but not where it 360 // will be in memory. Most of these could end up >2GB away so even a signed 361 // pc-relative 32-bit address is insufficient, theoretically. 362 if (PositionIndependent) { 363 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 364 dwarf::DW_EH_PE_sdata8; 365 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8; 366 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 367 dwarf::DW_EH_PE_sdata8; 368 } else { 369 PersonalityEncoding = dwarf::DW_EH_PE_absptr; 370 LSDAEncoding = dwarf::DW_EH_PE_absptr; 371 TTypeEncoding = dwarf::DW_EH_PE_absptr; 372 } 373 break; 374 case Triple::lanai: 375 LSDAEncoding = dwarf::DW_EH_PE_absptr; 376 PersonalityEncoding = dwarf::DW_EH_PE_absptr; 377 TTypeEncoding = dwarf::DW_EH_PE_absptr; 378 break; 379 case Triple::mips: 380 case Triple::mipsel: 381 case Triple::mips64: 382 case Triple::mips64el: 383 // MIPS uses indirect pointer to refer personality functions and types, so 384 // that the eh_frame section can be read-only. DW.ref.personality will be 385 // generated for relocation. 386 PersonalityEncoding = dwarf::DW_EH_PE_indirect; 387 // FIXME: The N64 ABI probably ought to use DW_EH_PE_sdata8 but we can't 388 // identify N64 from just a triple. 389 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 390 dwarf::DW_EH_PE_sdata4; 391 // We don't support PC-relative LSDA references in GAS so we use the default 392 // DW_EH_PE_absptr for those. 393 394 // FreeBSD must be explicit about the data size and using pcrel since it's 395 // assembler/linker won't do the automatic conversion that the Linux tools 396 // do. 397 if (T.isOSFreeBSD()) { 398 PersonalityEncoding |= dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 399 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 400 } 401 break; 402 case Triple::ppc64: 403 case Triple::ppc64le: 404 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 405 dwarf::DW_EH_PE_udata8; 406 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8; 407 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 408 dwarf::DW_EH_PE_udata8; 409 break; 410 case Triple::sparcel: 411 case Triple::sparc: 412 if (PositionIndependent) { 413 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 414 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 415 dwarf::DW_EH_PE_sdata4; 416 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 417 dwarf::DW_EH_PE_sdata4; 418 } else { 419 LSDAEncoding = dwarf::DW_EH_PE_absptr; 420 PersonalityEncoding = dwarf::DW_EH_PE_absptr; 421 TTypeEncoding = dwarf::DW_EH_PE_absptr; 422 } 423 break; 424 case Triple::sparcv9: 425 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 426 if (PositionIndependent) { 427 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 428 dwarf::DW_EH_PE_sdata4; 429 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 430 dwarf::DW_EH_PE_sdata4; 431 } else { 432 PersonalityEncoding = dwarf::DW_EH_PE_absptr; 433 TTypeEncoding = dwarf::DW_EH_PE_absptr; 434 } 435 break; 436 case Triple::systemz: 437 // All currently-defined code models guarantee that 4-byte PC-relative 438 // values will be in range. 439 if (PositionIndependent) { 440 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 441 dwarf::DW_EH_PE_sdata4; 442 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 443 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 444 dwarf::DW_EH_PE_sdata4; 445 } else { 446 PersonalityEncoding = dwarf::DW_EH_PE_absptr; 447 LSDAEncoding = dwarf::DW_EH_PE_absptr; 448 TTypeEncoding = dwarf::DW_EH_PE_absptr; 449 } 450 break; 451 default: 452 break; 453 } 454 455 unsigned EHSectionType = T.getArch() == Triple::x86_64 456 ? ELF::SHT_X86_64_UNWIND 457 : ELF::SHT_PROGBITS; 458 459 // Solaris requires different flags for .eh_frame to seemingly every other 460 // platform. 461 unsigned EHSectionFlags = ELF::SHF_ALLOC; 462 if (T.isOSSolaris() && T.getArch() != Triple::x86_64) 463 EHSectionFlags |= ELF::SHF_WRITE; 464 465 // ELF 466 BSSSection = Ctx->getELFSection(".bss", ELF::SHT_NOBITS, 467 ELF::SHF_WRITE | ELF::SHF_ALLOC); 468 469 TextSection = Ctx->getELFSection(".text", ELF::SHT_PROGBITS, 470 ELF::SHF_EXECINSTR | ELF::SHF_ALLOC); 471 472 DataSection = Ctx->getELFSection(".data", ELF::SHT_PROGBITS, 473 ELF::SHF_WRITE | ELF::SHF_ALLOC); 474 475 ReadOnlySection = 476 Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); 477 478 TLSDataSection = 479 Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS, 480 ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE); 481 482 TLSBSSSection = Ctx->getELFSection( 483 ".tbss", ELF::SHT_NOBITS, ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE); 484 485 DataRelROSection = Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS, 486 ELF::SHF_ALLOC | ELF::SHF_WRITE); 487 488 MergeableConst4Section = 489 Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS, 490 ELF::SHF_ALLOC | ELF::SHF_MERGE, 4, ""); 491 492 MergeableConst8Section = 493 Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS, 494 ELF::SHF_ALLOC | ELF::SHF_MERGE, 8, ""); 495 496 MergeableConst16Section = 497 Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS, 498 ELF::SHF_ALLOC | ELF::SHF_MERGE, 16, ""); 499 500 MergeableConst32Section = 501 Ctx->getELFSection(".rodata.cst32", ELF::SHT_PROGBITS, 502 ELF::SHF_ALLOC | ELF::SHF_MERGE, 32, ""); 503 504 // Exception Handling Sections. 505 506 // FIXME: We're emitting LSDA info into a readonly section on ELF, even though 507 // it contains relocatable pointers. In PIC mode, this is probably a big 508 // runtime hit for C++ apps. Either the contents of the LSDA need to be 509 // adjusted or this should be a data section. 510 LSDASection = Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS, 511 ELF::SHF_ALLOC); 512 513 COFFDebugSymbolsSection = nullptr; 514 COFFDebugTypesSection = nullptr; 515 516 unsigned DebugSecType = ELF::SHT_PROGBITS; 517 518 // MIPS .debug_* sections should have SHT_MIPS_DWARF section type 519 // to distinguish among sections contain DWARF and ECOFF debug formats. 520 // Sections with ECOFF debug format are obsoleted and marked by SHT_PROGBITS. 521 if (T.getArch() == Triple::mips || T.getArch() == Triple::mipsel || 522 T.getArch() == Triple::mips64 || T.getArch() == Triple::mips64el) 523 DebugSecType = ELF::SHT_MIPS_DWARF; 524 525 // Debug Info Sections. 526 DwarfAbbrevSection = 527 Ctx->getELFSection(".debug_abbrev", DebugSecType, 0); 528 DwarfInfoSection = Ctx->getELFSection(".debug_info", DebugSecType, 0); 529 DwarfLineSection = Ctx->getELFSection(".debug_line", DebugSecType, 0); 530 DwarfFrameSection = Ctx->getELFSection(".debug_frame", DebugSecType, 0); 531 DwarfPubNamesSection = 532 Ctx->getELFSection(".debug_pubnames", DebugSecType, 0); 533 DwarfPubTypesSection = 534 Ctx->getELFSection(".debug_pubtypes", DebugSecType, 0); 535 DwarfGnuPubNamesSection = 536 Ctx->getELFSection(".debug_gnu_pubnames", DebugSecType, 0); 537 DwarfGnuPubTypesSection = 538 Ctx->getELFSection(".debug_gnu_pubtypes", DebugSecType, 0); 539 DwarfStrSection = 540 Ctx->getELFSection(".debug_str", DebugSecType, 541 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, ""); 542 DwarfLocSection = Ctx->getELFSection(".debug_loc", DebugSecType, 0); 543 DwarfARangesSection = 544 Ctx->getELFSection(".debug_aranges", DebugSecType, 0); 545 DwarfRangesSection = 546 Ctx->getELFSection(".debug_ranges", DebugSecType, 0); 547 DwarfMacinfoSection = 548 Ctx->getELFSection(".debug_macinfo", DebugSecType, 0); 549 550 // DWARF5 Experimental Debug Info 551 552 // Accelerator Tables 553 DwarfAccelNamesSection = 554 Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0); 555 DwarfAccelObjCSection = 556 Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0); 557 DwarfAccelNamespaceSection = 558 Ctx->getELFSection(".apple_namespaces", ELF::SHT_PROGBITS, 0); 559 DwarfAccelTypesSection = 560 Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0); 561 562 // String Offset and Address Sections 563 DwarfStrOffSection = 564 Ctx->getELFSection(".debug_str_offsets", DebugSecType, 0); 565 DwarfAddrSection = Ctx->getELFSection(".debug_addr", DebugSecType, 0); 566 567 // Fission Sections 568 DwarfInfoDWOSection = 569 Ctx->getELFSection(".debug_info.dwo", DebugSecType, 0); 570 DwarfTypesDWOSection = 571 Ctx->getELFSection(".debug_types.dwo", DebugSecType, 0); 572 DwarfAbbrevDWOSection = 573 Ctx->getELFSection(".debug_abbrev.dwo", DebugSecType, 0); 574 DwarfStrDWOSection = 575 Ctx->getELFSection(".debug_str.dwo", DebugSecType, 576 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, ""); 577 DwarfLineDWOSection = 578 Ctx->getELFSection(".debug_line.dwo", DebugSecType, 0); 579 DwarfLocDWOSection = 580 Ctx->getELFSection(".debug_loc.dwo", DebugSecType, 0); 581 DwarfStrOffDWOSection = 582 Ctx->getELFSection(".debug_str_offsets.dwo", DebugSecType, 0); 583 584 // DWP Sections 585 DwarfCUIndexSection = 586 Ctx->getELFSection(".debug_cu_index", DebugSecType, 0); 587 DwarfTUIndexSection = 588 Ctx->getELFSection(".debug_tu_index", DebugSecType, 0); 589 590 StackMapSection = 591 Ctx->getELFSection(".llvm_stackmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); 592 593 FaultMapSection = 594 Ctx->getELFSection(".llvm_faultmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); 595 596 EHFrameSection = 597 Ctx->getELFSection(".eh_frame", EHSectionType, EHSectionFlags); 598 599 StackSizesSection = Ctx->getELFSection(".stack_sizes", ELF::SHT_PROGBITS, 0); 600 } 601 602 void MCObjectFileInfo::initCOFFMCObjectFileInfo(const Triple &T) { 603 EHFrameSection = Ctx->getCOFFSection( 604 ".eh_frame", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 605 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE, 606 SectionKind::getData()); 607 608 // Set the `IMAGE_SCN_MEM_16BIT` flag when compiling for thumb mode. This is 609 // used to indicate to the linker that the text segment contains thumb instructions 610 // and to set the ISA selection bit for calls accordingly. 611 const bool IsThumb = T.getArch() == Triple::thumb; 612 613 CommDirectiveSupportsAlignment = true; 614 615 // COFF 616 BSSSection = Ctx->getCOFFSection( 617 ".bss", COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA | 618 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE, 619 SectionKind::getBSS()); 620 TextSection = Ctx->getCOFFSection( 621 ".text", 622 (IsThumb ? COFF::IMAGE_SCN_MEM_16BIT : (COFF::SectionCharacteristics)0) | 623 COFF::IMAGE_SCN_CNT_CODE | COFF::IMAGE_SCN_MEM_EXECUTE | 624 COFF::IMAGE_SCN_MEM_READ, 625 SectionKind::getText()); 626 DataSection = Ctx->getCOFFSection( 627 ".data", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ | 628 COFF::IMAGE_SCN_MEM_WRITE, 629 SectionKind::getData()); 630 ReadOnlySection = Ctx->getCOFFSection( 631 ".rdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, 632 SectionKind::getReadOnly()); 633 634 // FIXME: We're emitting LSDA info into a readonly section on COFF, even 635 // though it contains relocatable pointers. In PIC mode, this is probably a 636 // big runtime hit for C++ apps. Either the contents of the LSDA need to be 637 // adjusted or this should be a data section. 638 if (T.getArch() == Triple::x86_64) { 639 // On Windows 64 with SEH, the LSDA is emitted into the .xdata section 640 LSDASection = nullptr; 641 } else { 642 LSDASection = Ctx->getCOFFSection(".gcc_except_table", 643 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 644 COFF::IMAGE_SCN_MEM_READ, 645 SectionKind::getReadOnly()); 646 } 647 648 // Debug info. 649 COFFDebugSymbolsSection = 650 Ctx->getCOFFSection(".debug$S", (COFF::IMAGE_SCN_MEM_DISCARDABLE | 651 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 652 COFF::IMAGE_SCN_MEM_READ), 653 SectionKind::getMetadata()); 654 COFFDebugTypesSection = 655 Ctx->getCOFFSection(".debug$T", (COFF::IMAGE_SCN_MEM_DISCARDABLE | 656 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 657 COFF::IMAGE_SCN_MEM_READ), 658 SectionKind::getMetadata()); 659 COFFGlobalTypeHashesSection = Ctx->getCOFFSection( 660 ".debug$H", 661 (COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 662 COFF::IMAGE_SCN_MEM_READ), 663 SectionKind::getMetadata()); 664 665 DwarfAbbrevSection = Ctx->getCOFFSection( 666 ".debug_abbrev", 667 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 668 COFF::IMAGE_SCN_MEM_READ, 669 SectionKind::getMetadata(), "section_abbrev"); 670 DwarfInfoSection = Ctx->getCOFFSection( 671 ".debug_info", 672 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 673 COFF::IMAGE_SCN_MEM_READ, 674 SectionKind::getMetadata(), "section_info"); 675 DwarfLineSection = Ctx->getCOFFSection( 676 ".debug_line", 677 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 678 COFF::IMAGE_SCN_MEM_READ, 679 SectionKind::getMetadata(), "section_line"); 680 681 DwarfFrameSection = Ctx->getCOFFSection( 682 ".debug_frame", 683 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 684 COFF::IMAGE_SCN_MEM_READ, 685 SectionKind::getMetadata()); 686 DwarfPubNamesSection = Ctx->getCOFFSection( 687 ".debug_pubnames", 688 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 689 COFF::IMAGE_SCN_MEM_READ, 690 SectionKind::getMetadata()); 691 DwarfPubTypesSection = Ctx->getCOFFSection( 692 ".debug_pubtypes", 693 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 694 COFF::IMAGE_SCN_MEM_READ, 695 SectionKind::getMetadata()); 696 DwarfGnuPubNamesSection = Ctx->getCOFFSection( 697 ".debug_gnu_pubnames", 698 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 699 COFF::IMAGE_SCN_MEM_READ, 700 SectionKind::getMetadata()); 701 DwarfGnuPubTypesSection = Ctx->getCOFFSection( 702 ".debug_gnu_pubtypes", 703 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 704 COFF::IMAGE_SCN_MEM_READ, 705 SectionKind::getMetadata()); 706 DwarfStrSection = Ctx->getCOFFSection( 707 ".debug_str", 708 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 709 COFF::IMAGE_SCN_MEM_READ, 710 SectionKind::getMetadata(), "info_string"); 711 DwarfStrOffSection = Ctx->getCOFFSection( 712 ".debug_str_offsets", 713 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 714 COFF::IMAGE_SCN_MEM_READ, 715 SectionKind::getMetadata(), "section_str_off"); 716 DwarfLocSection = Ctx->getCOFFSection( 717 ".debug_loc", 718 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 719 COFF::IMAGE_SCN_MEM_READ, 720 SectionKind::getMetadata(), "section_debug_loc"); 721 DwarfARangesSection = Ctx->getCOFFSection( 722 ".debug_aranges", 723 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 724 COFF::IMAGE_SCN_MEM_READ, 725 SectionKind::getMetadata()); 726 DwarfRangesSection = Ctx->getCOFFSection( 727 ".debug_ranges", 728 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 729 COFF::IMAGE_SCN_MEM_READ, 730 SectionKind::getMetadata(), "debug_range"); 731 DwarfMacinfoSection = Ctx->getCOFFSection( 732 ".debug_macinfo", 733 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 734 COFF::IMAGE_SCN_MEM_READ, 735 SectionKind::getMetadata(), "debug_macinfo"); 736 DwarfInfoDWOSection = Ctx->getCOFFSection( 737 ".debug_info.dwo", 738 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 739 COFF::IMAGE_SCN_MEM_READ, 740 SectionKind::getMetadata(), "section_info_dwo"); 741 DwarfTypesDWOSection = Ctx->getCOFFSection( 742 ".debug_types.dwo", 743 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 744 COFF::IMAGE_SCN_MEM_READ, 745 SectionKind::getMetadata(), "section_types_dwo"); 746 DwarfAbbrevDWOSection = Ctx->getCOFFSection( 747 ".debug_abbrev.dwo", 748 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 749 COFF::IMAGE_SCN_MEM_READ, 750 SectionKind::getMetadata(), "section_abbrev_dwo"); 751 DwarfStrDWOSection = Ctx->getCOFFSection( 752 ".debug_str.dwo", 753 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 754 COFF::IMAGE_SCN_MEM_READ, 755 SectionKind::getMetadata(), "skel_string"); 756 DwarfLineDWOSection = Ctx->getCOFFSection( 757 ".debug_line.dwo", 758 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 759 COFF::IMAGE_SCN_MEM_READ, 760 SectionKind::getMetadata()); 761 DwarfLocDWOSection = Ctx->getCOFFSection( 762 ".debug_loc.dwo", 763 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 764 COFF::IMAGE_SCN_MEM_READ, 765 SectionKind::getMetadata(), "skel_loc"); 766 DwarfStrOffDWOSection = Ctx->getCOFFSection( 767 ".debug_str_offsets.dwo", 768 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 769 COFF::IMAGE_SCN_MEM_READ, 770 SectionKind::getMetadata(), "section_str_off_dwo"); 771 DwarfAddrSection = Ctx->getCOFFSection( 772 ".debug_addr", 773 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 774 COFF::IMAGE_SCN_MEM_READ, 775 SectionKind::getMetadata(), "addr_sec"); 776 DwarfCUIndexSection = Ctx->getCOFFSection( 777 ".debug_cu_index", 778 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 779 COFF::IMAGE_SCN_MEM_READ, 780 SectionKind::getMetadata()); 781 DwarfTUIndexSection = Ctx->getCOFFSection( 782 ".debug_tu_index", 783 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 784 COFF::IMAGE_SCN_MEM_READ, 785 SectionKind::getMetadata()); 786 DwarfAccelNamesSection = Ctx->getCOFFSection( 787 ".apple_names", 788 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 789 COFF::IMAGE_SCN_MEM_READ, 790 SectionKind::getMetadata(), "names_begin"); 791 DwarfAccelNamespaceSection = Ctx->getCOFFSection( 792 ".apple_namespaces", 793 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 794 COFF::IMAGE_SCN_MEM_READ, 795 SectionKind::getMetadata(), "namespac_begin"); 796 DwarfAccelTypesSection = Ctx->getCOFFSection( 797 ".apple_types", 798 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 799 COFF::IMAGE_SCN_MEM_READ, 800 SectionKind::getMetadata(), "types_begin"); 801 DwarfAccelObjCSection = Ctx->getCOFFSection( 802 ".apple_objc", 803 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 804 COFF::IMAGE_SCN_MEM_READ, 805 SectionKind::getMetadata(), "objc_begin"); 806 807 DrectveSection = Ctx->getCOFFSection( 808 ".drectve", COFF::IMAGE_SCN_LNK_INFO | COFF::IMAGE_SCN_LNK_REMOVE, 809 SectionKind::getMetadata()); 810 811 PDataSection = Ctx->getCOFFSection( 812 ".pdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, 813 SectionKind::getData()); 814 815 XDataSection = Ctx->getCOFFSection( 816 ".xdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, 817 SectionKind::getData()); 818 819 SXDataSection = Ctx->getCOFFSection(".sxdata", COFF::IMAGE_SCN_LNK_INFO, 820 SectionKind::getMetadata()); 821 822 GFIDsSection = Ctx->getCOFFSection(".gfids$y", 823 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 824 COFF::IMAGE_SCN_MEM_READ, 825 SectionKind::getMetadata()); 826 827 TLSDataSection = Ctx->getCOFFSection( 828 ".tls$", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ | 829 COFF::IMAGE_SCN_MEM_WRITE, 830 SectionKind::getData()); 831 832 StackMapSection = Ctx->getCOFFSection(".llvm_stackmaps", 833 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 834 COFF::IMAGE_SCN_MEM_READ, 835 SectionKind::getReadOnly()); 836 } 837 838 void MCObjectFileInfo::initWasmMCObjectFileInfo(const Triple &T) { 839 // TODO: Set the section types and flags. 840 TextSection = Ctx->getWasmSection(".text", SectionKind::getText()); 841 DataSection = Ctx->getWasmSection(".data", SectionKind::getData()); 842 843 // TODO: Set the section types and flags. 844 DwarfLineSection = Ctx->getWasmSection(".debug_line", SectionKind::getMetadata()); 845 DwarfStrSection = Ctx->getWasmSection(".debug_str", SectionKind::getMetadata()); 846 DwarfLocSection = Ctx->getWasmSection(".debug_loc", SectionKind::getMetadata()); 847 DwarfAbbrevSection = Ctx->getWasmSection(".debug_abbrev", SectionKind::getMetadata(), "section_abbrev"); 848 DwarfARangesSection = Ctx->getWasmSection(".debug_aranges", SectionKind::getMetadata()); 849 DwarfRangesSection = Ctx->getWasmSection(".debug_ranges", SectionKind::getMetadata(), "debug_range"); 850 DwarfMacinfoSection = Ctx->getWasmSection(".debug_macinfo", SectionKind::getMetadata(), "debug_macinfo"); 851 DwarfAddrSection = Ctx->getWasmSection(".debug_addr", SectionKind::getMetadata()); 852 DwarfCUIndexSection = Ctx->getWasmSection(".debug_cu_index", SectionKind::getMetadata()); 853 DwarfTUIndexSection = Ctx->getWasmSection(".debug_tu_index", SectionKind::getMetadata()); 854 DwarfInfoSection = Ctx->getWasmSection(".debug_info", SectionKind::getMetadata(), "section_info"); 855 DwarfFrameSection = Ctx->getWasmSection(".debug_frame", SectionKind::getMetadata()); 856 DwarfPubNamesSection = Ctx->getWasmSection(".debug_pubnames", SectionKind::getMetadata()); 857 DwarfPubTypesSection = Ctx->getWasmSection(".debug_pubtypes", SectionKind::getMetadata()); 858 859 // TODO: Define more sections. 860 } 861 862 void MCObjectFileInfo::InitMCObjectFileInfo(const Triple &TheTriple, bool PIC, 863 MCContext &ctx, 864 bool LargeCodeModel) { 865 PositionIndependent = PIC; 866 Ctx = &ctx; 867 868 // Common. 869 CommDirectiveSupportsAlignment = true; 870 SupportsWeakOmittedEHFrame = true; 871 SupportsCompactUnwindWithoutEHFrame = false; 872 OmitDwarfIfHaveCompactUnwind = false; 873 874 PersonalityEncoding = LSDAEncoding = FDECFIEncoding = TTypeEncoding = 875 dwarf::DW_EH_PE_absptr; 876 877 CompactUnwindDwarfEHFrameOnly = 0; 878 879 EHFrameSection = nullptr; // Created on demand. 880 CompactUnwindSection = nullptr; // Used only by selected targets. 881 DwarfAccelNamesSection = nullptr; // Used only by selected targets. 882 DwarfAccelObjCSection = nullptr; // Used only by selected targets. 883 DwarfAccelNamespaceSection = nullptr; // Used only by selected targets. 884 DwarfAccelTypesSection = nullptr; // Used only by selected targets. 885 886 TT = TheTriple; 887 888 switch (TT.getObjectFormat()) { 889 case Triple::MachO: 890 Env = IsMachO; 891 initMachOMCObjectFileInfo(TT); 892 break; 893 case Triple::COFF: 894 if (!TT.isOSWindows()) 895 report_fatal_error( 896 "Cannot initialize MC for non-Windows COFF object files."); 897 898 Env = IsCOFF; 899 initCOFFMCObjectFileInfo(TT); 900 break; 901 case Triple::ELF: 902 Env = IsELF; 903 initELFMCObjectFileInfo(TT, LargeCodeModel); 904 break; 905 case Triple::Wasm: 906 Env = IsWasm; 907 initWasmMCObjectFileInfo(TT); 908 break; 909 case Triple::UnknownObjectFormat: 910 report_fatal_error("Cannot initialize MC for unknown object file format."); 911 break; 912 } 913 } 914 915 MCSection *MCObjectFileInfo::getDwarfTypesSection(uint64_t Hash) const { 916 return Ctx->getELFSection(".debug_types", ELF::SHT_PROGBITS, ELF::SHF_GROUP, 917 0, utostr(Hash)); 918 } 919