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 DwarfLineStrSection = 232 Ctx->getMachOSection("__DWARF", "__debug_line_str", MachO::S_ATTR_DEBUG, 233 SectionKind::getMetadata(), "section_line_str"); 234 DwarfFrameSection = 235 Ctx->getMachOSection("__DWARF", "__debug_frame", MachO::S_ATTR_DEBUG, 236 SectionKind::getMetadata()); 237 DwarfPubNamesSection = 238 Ctx->getMachOSection("__DWARF", "__debug_pubnames", MachO::S_ATTR_DEBUG, 239 SectionKind::getMetadata()); 240 DwarfPubTypesSection = 241 Ctx->getMachOSection("__DWARF", "__debug_pubtypes", MachO::S_ATTR_DEBUG, 242 SectionKind::getMetadata()); 243 DwarfGnuPubNamesSection = 244 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubn", MachO::S_ATTR_DEBUG, 245 SectionKind::getMetadata()); 246 DwarfGnuPubTypesSection = 247 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubt", MachO::S_ATTR_DEBUG, 248 SectionKind::getMetadata()); 249 DwarfStrSection = 250 Ctx->getMachOSection("__DWARF", "__debug_str", MachO::S_ATTR_DEBUG, 251 SectionKind::getMetadata(), "info_string"); 252 DwarfStrOffSection = 253 Ctx->getMachOSection("__DWARF", "__debug_str_offs", MachO::S_ATTR_DEBUG, 254 SectionKind::getMetadata(), "section_str_off"); 255 DwarfLocSection = 256 Ctx->getMachOSection("__DWARF", "__debug_loc", MachO::S_ATTR_DEBUG, 257 SectionKind::getMetadata(), "section_debug_loc"); 258 DwarfARangesSection = 259 Ctx->getMachOSection("__DWARF", "__debug_aranges", MachO::S_ATTR_DEBUG, 260 SectionKind::getMetadata()); 261 DwarfRangesSection = 262 Ctx->getMachOSection("__DWARF", "__debug_ranges", MachO::S_ATTR_DEBUG, 263 SectionKind::getMetadata(), "debug_range"); 264 DwarfMacinfoSection = 265 Ctx->getMachOSection("__DWARF", "__debug_macinfo", MachO::S_ATTR_DEBUG, 266 SectionKind::getMetadata(), "debug_macinfo"); 267 DwarfDebugInlineSection = 268 Ctx->getMachOSection("__DWARF", "__debug_inlined", MachO::S_ATTR_DEBUG, 269 SectionKind::getMetadata()); 270 DwarfCUIndexSection = 271 Ctx->getMachOSection("__DWARF", "__debug_cu_index", MachO::S_ATTR_DEBUG, 272 SectionKind::getMetadata()); 273 DwarfTUIndexSection = 274 Ctx->getMachOSection("__DWARF", "__debug_tu_index", MachO::S_ATTR_DEBUG, 275 SectionKind::getMetadata()); 276 StackMapSection = Ctx->getMachOSection("__LLVM_STACKMAPS", "__llvm_stackmaps", 277 0, SectionKind::getMetadata()); 278 279 FaultMapSection = Ctx->getMachOSection("__LLVM_FAULTMAPS", "__llvm_faultmaps", 280 0, SectionKind::getMetadata()); 281 282 TLSExtraDataSection = TLSTLVSection; 283 } 284 285 void MCObjectFileInfo::initELFMCObjectFileInfo(const Triple &T, bool Large) { 286 switch (T.getArch()) { 287 case Triple::mips: 288 case Triple::mipsel: 289 FDECFIEncoding = dwarf::DW_EH_PE_sdata4; 290 break; 291 case Triple::mips64: 292 case Triple::mips64el: 293 FDECFIEncoding = dwarf::DW_EH_PE_sdata8; 294 break; 295 case Triple::x86_64: 296 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | 297 (Large ? dwarf::DW_EH_PE_sdata8 : dwarf::DW_EH_PE_sdata4); 298 break; 299 case Triple::bpfel: 300 case Triple::bpfeb: 301 FDECFIEncoding = dwarf::DW_EH_PE_sdata8; 302 break; 303 default: 304 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 305 break; 306 } 307 308 switch (T.getArch()) { 309 case Triple::arm: 310 case Triple::armeb: 311 case Triple::thumb: 312 case Triple::thumbeb: 313 if (Ctx->getAsmInfo()->getExceptionHandlingType() == ExceptionHandling::ARM) 314 break; 315 // Fallthrough if not using EHABI 316 LLVM_FALLTHROUGH; 317 case Triple::ppc: 318 case Triple::x86: 319 PersonalityEncoding = PositionIndependent 320 ? dwarf::DW_EH_PE_indirect | 321 dwarf::DW_EH_PE_pcrel | 322 dwarf::DW_EH_PE_sdata4 323 : dwarf::DW_EH_PE_absptr; 324 LSDAEncoding = PositionIndependent 325 ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4 326 : dwarf::DW_EH_PE_absptr; 327 TTypeEncoding = PositionIndependent 328 ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 329 dwarf::DW_EH_PE_sdata4 330 : dwarf::DW_EH_PE_absptr; 331 break; 332 case Triple::x86_64: 333 if (PositionIndependent) { 334 PersonalityEncoding = 335 dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 336 (Large ? dwarf::DW_EH_PE_sdata8 : dwarf::DW_EH_PE_sdata4); 337 LSDAEncoding = dwarf::DW_EH_PE_pcrel | 338 (Large ? dwarf::DW_EH_PE_sdata8 : dwarf::DW_EH_PE_sdata4); 339 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 340 (Large ? dwarf::DW_EH_PE_sdata8 : dwarf::DW_EH_PE_sdata4); 341 } else { 342 PersonalityEncoding = 343 Large ? dwarf::DW_EH_PE_absptr : dwarf::DW_EH_PE_udata4; 344 LSDAEncoding = Large ? dwarf::DW_EH_PE_absptr : dwarf::DW_EH_PE_udata4; 345 TTypeEncoding = Large ? dwarf::DW_EH_PE_absptr : dwarf::DW_EH_PE_udata4; 346 } 347 break; 348 case Triple::hexagon: 349 PersonalityEncoding = dwarf::DW_EH_PE_absptr; 350 LSDAEncoding = dwarf::DW_EH_PE_absptr; 351 FDECFIEncoding = dwarf::DW_EH_PE_absptr; 352 TTypeEncoding = dwarf::DW_EH_PE_absptr; 353 if (PositionIndependent) { 354 PersonalityEncoding |= dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel; 355 LSDAEncoding |= dwarf::DW_EH_PE_pcrel; 356 FDECFIEncoding |= dwarf::DW_EH_PE_pcrel; 357 TTypeEncoding |= dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel; 358 } 359 break; 360 case Triple::aarch64: 361 case Triple::aarch64_be: 362 // The small model guarantees static code/data size < 4GB, but not where it 363 // will be in memory. Most of these could end up >2GB away so even a signed 364 // pc-relative 32-bit address is insufficient, theoretically. 365 if (PositionIndependent) { 366 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 367 dwarf::DW_EH_PE_sdata8; 368 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8; 369 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 370 dwarf::DW_EH_PE_sdata8; 371 } else { 372 PersonalityEncoding = dwarf::DW_EH_PE_absptr; 373 LSDAEncoding = dwarf::DW_EH_PE_absptr; 374 TTypeEncoding = dwarf::DW_EH_PE_absptr; 375 } 376 break; 377 case Triple::lanai: 378 LSDAEncoding = dwarf::DW_EH_PE_absptr; 379 PersonalityEncoding = dwarf::DW_EH_PE_absptr; 380 TTypeEncoding = dwarf::DW_EH_PE_absptr; 381 break; 382 case Triple::mips: 383 case Triple::mipsel: 384 case Triple::mips64: 385 case Triple::mips64el: 386 // MIPS uses indirect pointer to refer personality functions and types, so 387 // that the eh_frame section can be read-only. DW.ref.personality will be 388 // generated for relocation. 389 PersonalityEncoding = dwarf::DW_EH_PE_indirect; 390 // FIXME: The N64 ABI probably ought to use DW_EH_PE_sdata8 but we can't 391 // identify N64 from just a triple. 392 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 393 dwarf::DW_EH_PE_sdata4; 394 // We don't support PC-relative LSDA references in GAS so we use the default 395 // DW_EH_PE_absptr for those. 396 397 // FreeBSD must be explicit about the data size and using pcrel since it's 398 // assembler/linker won't do the automatic conversion that the Linux tools 399 // do. 400 if (T.isOSFreeBSD()) { 401 PersonalityEncoding |= dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 402 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 403 } 404 break; 405 case Triple::ppc64: 406 case Triple::ppc64le: 407 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 408 dwarf::DW_EH_PE_udata8; 409 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8; 410 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 411 dwarf::DW_EH_PE_udata8; 412 break; 413 case Triple::sparcel: 414 case Triple::sparc: 415 if (PositionIndependent) { 416 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 417 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 418 dwarf::DW_EH_PE_sdata4; 419 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 420 dwarf::DW_EH_PE_sdata4; 421 } else { 422 LSDAEncoding = dwarf::DW_EH_PE_absptr; 423 PersonalityEncoding = dwarf::DW_EH_PE_absptr; 424 TTypeEncoding = dwarf::DW_EH_PE_absptr; 425 } 426 break; 427 case Triple::sparcv9: 428 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 429 if (PositionIndependent) { 430 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 431 dwarf::DW_EH_PE_sdata4; 432 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 433 dwarf::DW_EH_PE_sdata4; 434 } else { 435 PersonalityEncoding = dwarf::DW_EH_PE_absptr; 436 TTypeEncoding = dwarf::DW_EH_PE_absptr; 437 } 438 break; 439 case Triple::systemz: 440 // All currently-defined code models guarantee that 4-byte PC-relative 441 // values will be in range. 442 if (PositionIndependent) { 443 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 444 dwarf::DW_EH_PE_sdata4; 445 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 446 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 447 dwarf::DW_EH_PE_sdata4; 448 } else { 449 PersonalityEncoding = dwarf::DW_EH_PE_absptr; 450 LSDAEncoding = dwarf::DW_EH_PE_absptr; 451 TTypeEncoding = dwarf::DW_EH_PE_absptr; 452 } 453 break; 454 default: 455 break; 456 } 457 458 unsigned EHSectionType = T.getArch() == Triple::x86_64 459 ? ELF::SHT_X86_64_UNWIND 460 : ELF::SHT_PROGBITS; 461 462 // Solaris requires different flags for .eh_frame to seemingly every other 463 // platform. 464 unsigned EHSectionFlags = ELF::SHF_ALLOC; 465 if (T.isOSSolaris() && T.getArch() != Triple::x86_64) 466 EHSectionFlags |= ELF::SHF_WRITE; 467 468 // ELF 469 BSSSection = Ctx->getELFSection(".bss", ELF::SHT_NOBITS, 470 ELF::SHF_WRITE | ELF::SHF_ALLOC); 471 472 TextSection = Ctx->getELFSection(".text", ELF::SHT_PROGBITS, 473 ELF::SHF_EXECINSTR | ELF::SHF_ALLOC); 474 475 DataSection = Ctx->getELFSection(".data", ELF::SHT_PROGBITS, 476 ELF::SHF_WRITE | ELF::SHF_ALLOC); 477 478 ReadOnlySection = 479 Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); 480 481 TLSDataSection = 482 Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS, 483 ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE); 484 485 TLSBSSSection = Ctx->getELFSection( 486 ".tbss", ELF::SHT_NOBITS, ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE); 487 488 DataRelROSection = Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS, 489 ELF::SHF_ALLOC | ELF::SHF_WRITE); 490 491 MergeableConst4Section = 492 Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS, 493 ELF::SHF_ALLOC | ELF::SHF_MERGE, 4, ""); 494 495 MergeableConst8Section = 496 Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS, 497 ELF::SHF_ALLOC | ELF::SHF_MERGE, 8, ""); 498 499 MergeableConst16Section = 500 Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS, 501 ELF::SHF_ALLOC | ELF::SHF_MERGE, 16, ""); 502 503 MergeableConst32Section = 504 Ctx->getELFSection(".rodata.cst32", ELF::SHT_PROGBITS, 505 ELF::SHF_ALLOC | ELF::SHF_MERGE, 32, ""); 506 507 // Exception Handling Sections. 508 509 // FIXME: We're emitting LSDA info into a readonly section on ELF, even though 510 // it contains relocatable pointers. In PIC mode, this is probably a big 511 // runtime hit for C++ apps. Either the contents of the LSDA need to be 512 // adjusted or this should be a data section. 513 LSDASection = Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS, 514 ELF::SHF_ALLOC); 515 516 COFFDebugSymbolsSection = nullptr; 517 COFFDebugTypesSection = nullptr; 518 519 unsigned DebugSecType = ELF::SHT_PROGBITS; 520 521 // MIPS .debug_* sections should have SHT_MIPS_DWARF section type 522 // to distinguish among sections contain DWARF and ECOFF debug formats. 523 // Sections with ECOFF debug format are obsoleted and marked by SHT_PROGBITS. 524 if (T.getArch() == Triple::mips || T.getArch() == Triple::mipsel || 525 T.getArch() == Triple::mips64 || T.getArch() == Triple::mips64el) 526 DebugSecType = ELF::SHT_MIPS_DWARF; 527 528 // Debug Info Sections. 529 DwarfAbbrevSection = 530 Ctx->getELFSection(".debug_abbrev", DebugSecType, 0); 531 DwarfInfoSection = Ctx->getELFSection(".debug_info", DebugSecType, 0); 532 DwarfLineSection = Ctx->getELFSection(".debug_line", DebugSecType, 0); 533 DwarfLineStrSection = 534 Ctx->getELFSection(".debug_line_str", DebugSecType, 535 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, ""); 536 DwarfFrameSection = Ctx->getELFSection(".debug_frame", DebugSecType, 0); 537 DwarfPubNamesSection = 538 Ctx->getELFSection(".debug_pubnames", DebugSecType, 0); 539 DwarfPubTypesSection = 540 Ctx->getELFSection(".debug_pubtypes", DebugSecType, 0); 541 DwarfGnuPubNamesSection = 542 Ctx->getELFSection(".debug_gnu_pubnames", DebugSecType, 0); 543 DwarfGnuPubTypesSection = 544 Ctx->getELFSection(".debug_gnu_pubtypes", DebugSecType, 0); 545 DwarfStrSection = 546 Ctx->getELFSection(".debug_str", DebugSecType, 547 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, ""); 548 DwarfLocSection = Ctx->getELFSection(".debug_loc", DebugSecType, 0); 549 DwarfARangesSection = 550 Ctx->getELFSection(".debug_aranges", DebugSecType, 0); 551 DwarfRangesSection = 552 Ctx->getELFSection(".debug_ranges", DebugSecType, 0); 553 DwarfMacinfoSection = 554 Ctx->getELFSection(".debug_macinfo", DebugSecType, 0); 555 556 // DWARF5 Experimental Debug Info 557 558 // Accelerator Tables 559 DwarfAccelNamesSection = 560 Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0); 561 DwarfAccelObjCSection = 562 Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0); 563 DwarfAccelNamespaceSection = 564 Ctx->getELFSection(".apple_namespaces", ELF::SHT_PROGBITS, 0); 565 DwarfAccelTypesSection = 566 Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0); 567 568 // String Offset and Address Sections 569 DwarfStrOffSection = 570 Ctx->getELFSection(".debug_str_offsets", DebugSecType, 0); 571 DwarfAddrSection = Ctx->getELFSection(".debug_addr", DebugSecType, 0); 572 573 // Fission Sections 574 DwarfInfoDWOSection = 575 Ctx->getELFSection(".debug_info.dwo", DebugSecType, 0); 576 DwarfTypesDWOSection = 577 Ctx->getELFSection(".debug_types.dwo", DebugSecType, 0); 578 DwarfAbbrevDWOSection = 579 Ctx->getELFSection(".debug_abbrev.dwo", DebugSecType, 0); 580 DwarfStrDWOSection = 581 Ctx->getELFSection(".debug_str.dwo", DebugSecType, 582 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, ""); 583 DwarfLineDWOSection = 584 Ctx->getELFSection(".debug_line.dwo", DebugSecType, 0); 585 DwarfLocDWOSection = 586 Ctx->getELFSection(".debug_loc.dwo", DebugSecType, 0); 587 DwarfStrOffDWOSection = 588 Ctx->getELFSection(".debug_str_offsets.dwo", DebugSecType, 0); 589 590 // DWP Sections 591 DwarfCUIndexSection = 592 Ctx->getELFSection(".debug_cu_index", DebugSecType, 0); 593 DwarfTUIndexSection = 594 Ctx->getELFSection(".debug_tu_index", DebugSecType, 0); 595 596 StackMapSection = 597 Ctx->getELFSection(".llvm_stackmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); 598 599 FaultMapSection = 600 Ctx->getELFSection(".llvm_faultmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); 601 602 EHFrameSection = 603 Ctx->getELFSection(".eh_frame", EHSectionType, EHSectionFlags); 604 605 StackSizesSection = Ctx->getELFSection(".stack_sizes", ELF::SHT_PROGBITS, 0); 606 } 607 608 void MCObjectFileInfo::initCOFFMCObjectFileInfo(const Triple &T) { 609 EHFrameSection = Ctx->getCOFFSection( 610 ".eh_frame", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 611 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE, 612 SectionKind::getData()); 613 614 // Set the `IMAGE_SCN_MEM_16BIT` flag when compiling for thumb mode. This is 615 // used to indicate to the linker that the text segment contains thumb instructions 616 // and to set the ISA selection bit for calls accordingly. 617 const bool IsThumb = T.getArch() == Triple::thumb; 618 619 CommDirectiveSupportsAlignment = true; 620 621 // COFF 622 BSSSection = Ctx->getCOFFSection( 623 ".bss", COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA | 624 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE, 625 SectionKind::getBSS()); 626 TextSection = Ctx->getCOFFSection( 627 ".text", 628 (IsThumb ? COFF::IMAGE_SCN_MEM_16BIT : (COFF::SectionCharacteristics)0) | 629 COFF::IMAGE_SCN_CNT_CODE | COFF::IMAGE_SCN_MEM_EXECUTE | 630 COFF::IMAGE_SCN_MEM_READ, 631 SectionKind::getText()); 632 DataSection = Ctx->getCOFFSection( 633 ".data", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ | 634 COFF::IMAGE_SCN_MEM_WRITE, 635 SectionKind::getData()); 636 ReadOnlySection = Ctx->getCOFFSection( 637 ".rdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, 638 SectionKind::getReadOnly()); 639 640 // FIXME: We're emitting LSDA info into a readonly section on COFF, even 641 // though it contains relocatable pointers. In PIC mode, this is probably a 642 // big runtime hit for C++ apps. Either the contents of the LSDA need to be 643 // adjusted or this should be a data section. 644 if (T.getArch() == Triple::x86_64) { 645 // On Windows 64 with SEH, the LSDA is emitted into the .xdata section 646 LSDASection = nullptr; 647 } else { 648 LSDASection = Ctx->getCOFFSection(".gcc_except_table", 649 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 650 COFF::IMAGE_SCN_MEM_READ, 651 SectionKind::getReadOnly()); 652 } 653 654 // Debug info. 655 COFFDebugSymbolsSection = 656 Ctx->getCOFFSection(".debug$S", (COFF::IMAGE_SCN_MEM_DISCARDABLE | 657 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 658 COFF::IMAGE_SCN_MEM_READ), 659 SectionKind::getMetadata()); 660 COFFDebugTypesSection = 661 Ctx->getCOFFSection(".debug$T", (COFF::IMAGE_SCN_MEM_DISCARDABLE | 662 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 663 COFF::IMAGE_SCN_MEM_READ), 664 SectionKind::getMetadata()); 665 COFFGlobalTypeHashesSection = Ctx->getCOFFSection( 666 ".debug$H", 667 (COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 668 COFF::IMAGE_SCN_MEM_READ), 669 SectionKind::getMetadata()); 670 671 DwarfAbbrevSection = Ctx->getCOFFSection( 672 ".debug_abbrev", 673 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 674 COFF::IMAGE_SCN_MEM_READ, 675 SectionKind::getMetadata(), "section_abbrev"); 676 DwarfInfoSection = Ctx->getCOFFSection( 677 ".debug_info", 678 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 679 COFF::IMAGE_SCN_MEM_READ, 680 SectionKind::getMetadata(), "section_info"); 681 DwarfLineSection = Ctx->getCOFFSection( 682 ".debug_line", 683 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 684 COFF::IMAGE_SCN_MEM_READ, 685 SectionKind::getMetadata(), "section_line"); 686 DwarfLineStrSection = Ctx->getCOFFSection( 687 ".debug_line_str", 688 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 689 COFF::IMAGE_SCN_MEM_READ, 690 SectionKind::getMetadata(), "section_line_str"); 691 DwarfFrameSection = Ctx->getCOFFSection( 692 ".debug_frame", 693 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 694 COFF::IMAGE_SCN_MEM_READ, 695 SectionKind::getMetadata()); 696 DwarfPubNamesSection = Ctx->getCOFFSection( 697 ".debug_pubnames", 698 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 699 COFF::IMAGE_SCN_MEM_READ, 700 SectionKind::getMetadata()); 701 DwarfPubTypesSection = Ctx->getCOFFSection( 702 ".debug_pubtypes", 703 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 704 COFF::IMAGE_SCN_MEM_READ, 705 SectionKind::getMetadata()); 706 DwarfGnuPubNamesSection = Ctx->getCOFFSection( 707 ".debug_gnu_pubnames", 708 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 709 COFF::IMAGE_SCN_MEM_READ, 710 SectionKind::getMetadata()); 711 DwarfGnuPubTypesSection = Ctx->getCOFFSection( 712 ".debug_gnu_pubtypes", 713 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 714 COFF::IMAGE_SCN_MEM_READ, 715 SectionKind::getMetadata()); 716 DwarfStrSection = Ctx->getCOFFSection( 717 ".debug_str", 718 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 719 COFF::IMAGE_SCN_MEM_READ, 720 SectionKind::getMetadata(), "info_string"); 721 DwarfStrOffSection = Ctx->getCOFFSection( 722 ".debug_str_offsets", 723 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 724 COFF::IMAGE_SCN_MEM_READ, 725 SectionKind::getMetadata(), "section_str_off"); 726 DwarfLocSection = Ctx->getCOFFSection( 727 ".debug_loc", 728 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 729 COFF::IMAGE_SCN_MEM_READ, 730 SectionKind::getMetadata(), "section_debug_loc"); 731 DwarfARangesSection = Ctx->getCOFFSection( 732 ".debug_aranges", 733 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 734 COFF::IMAGE_SCN_MEM_READ, 735 SectionKind::getMetadata()); 736 DwarfRangesSection = Ctx->getCOFFSection( 737 ".debug_ranges", 738 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 739 COFF::IMAGE_SCN_MEM_READ, 740 SectionKind::getMetadata(), "debug_range"); 741 DwarfMacinfoSection = Ctx->getCOFFSection( 742 ".debug_macinfo", 743 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 744 COFF::IMAGE_SCN_MEM_READ, 745 SectionKind::getMetadata(), "debug_macinfo"); 746 DwarfInfoDWOSection = Ctx->getCOFFSection( 747 ".debug_info.dwo", 748 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 749 COFF::IMAGE_SCN_MEM_READ, 750 SectionKind::getMetadata(), "section_info_dwo"); 751 DwarfTypesDWOSection = Ctx->getCOFFSection( 752 ".debug_types.dwo", 753 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 754 COFF::IMAGE_SCN_MEM_READ, 755 SectionKind::getMetadata(), "section_types_dwo"); 756 DwarfAbbrevDWOSection = Ctx->getCOFFSection( 757 ".debug_abbrev.dwo", 758 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 759 COFF::IMAGE_SCN_MEM_READ, 760 SectionKind::getMetadata(), "section_abbrev_dwo"); 761 DwarfStrDWOSection = Ctx->getCOFFSection( 762 ".debug_str.dwo", 763 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 764 COFF::IMAGE_SCN_MEM_READ, 765 SectionKind::getMetadata(), "skel_string"); 766 DwarfLineDWOSection = Ctx->getCOFFSection( 767 ".debug_line.dwo", 768 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 769 COFF::IMAGE_SCN_MEM_READ, 770 SectionKind::getMetadata()); 771 DwarfLocDWOSection = Ctx->getCOFFSection( 772 ".debug_loc.dwo", 773 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 774 COFF::IMAGE_SCN_MEM_READ, 775 SectionKind::getMetadata(), "skel_loc"); 776 DwarfStrOffDWOSection = Ctx->getCOFFSection( 777 ".debug_str_offsets.dwo", 778 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 779 COFF::IMAGE_SCN_MEM_READ, 780 SectionKind::getMetadata(), "section_str_off_dwo"); 781 DwarfAddrSection = Ctx->getCOFFSection( 782 ".debug_addr", 783 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 784 COFF::IMAGE_SCN_MEM_READ, 785 SectionKind::getMetadata(), "addr_sec"); 786 DwarfCUIndexSection = Ctx->getCOFFSection( 787 ".debug_cu_index", 788 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 789 COFF::IMAGE_SCN_MEM_READ, 790 SectionKind::getMetadata()); 791 DwarfTUIndexSection = Ctx->getCOFFSection( 792 ".debug_tu_index", 793 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 794 COFF::IMAGE_SCN_MEM_READ, 795 SectionKind::getMetadata()); 796 DwarfAccelNamesSection = Ctx->getCOFFSection( 797 ".apple_names", 798 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 799 COFF::IMAGE_SCN_MEM_READ, 800 SectionKind::getMetadata(), "names_begin"); 801 DwarfAccelNamespaceSection = Ctx->getCOFFSection( 802 ".apple_namespaces", 803 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 804 COFF::IMAGE_SCN_MEM_READ, 805 SectionKind::getMetadata(), "namespac_begin"); 806 DwarfAccelTypesSection = Ctx->getCOFFSection( 807 ".apple_types", 808 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 809 COFF::IMAGE_SCN_MEM_READ, 810 SectionKind::getMetadata(), "types_begin"); 811 DwarfAccelObjCSection = Ctx->getCOFFSection( 812 ".apple_objc", 813 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 814 COFF::IMAGE_SCN_MEM_READ, 815 SectionKind::getMetadata(), "objc_begin"); 816 817 DrectveSection = Ctx->getCOFFSection( 818 ".drectve", COFF::IMAGE_SCN_LNK_INFO | COFF::IMAGE_SCN_LNK_REMOVE, 819 SectionKind::getMetadata()); 820 821 PDataSection = Ctx->getCOFFSection( 822 ".pdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, 823 SectionKind::getData()); 824 825 XDataSection = Ctx->getCOFFSection( 826 ".xdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, 827 SectionKind::getData()); 828 829 SXDataSection = Ctx->getCOFFSection(".sxdata", COFF::IMAGE_SCN_LNK_INFO, 830 SectionKind::getMetadata()); 831 832 GFIDsSection = Ctx->getCOFFSection(".gfids$y", 833 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 834 COFF::IMAGE_SCN_MEM_READ, 835 SectionKind::getMetadata()); 836 837 TLSDataSection = Ctx->getCOFFSection( 838 ".tls$", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ | 839 COFF::IMAGE_SCN_MEM_WRITE, 840 SectionKind::getData()); 841 842 StackMapSection = Ctx->getCOFFSection(".llvm_stackmaps", 843 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 844 COFF::IMAGE_SCN_MEM_READ, 845 SectionKind::getReadOnly()); 846 } 847 848 void MCObjectFileInfo::initWasmMCObjectFileInfo(const Triple &T) { 849 // TODO: Set the section types and flags. 850 TextSection = Ctx->getWasmSection(".text", SectionKind::getText()); 851 DataSection = Ctx->getWasmSection(".data", SectionKind::getData()); 852 853 // TODO: Set the section types and flags. 854 DwarfLineSection = Ctx->getWasmSection(".debug_line", SectionKind::getMetadata()); 855 DwarfLineStrSection = 856 Ctx->getWasmSection(".debug_line_str", SectionKind::getMetadata()); 857 DwarfStrSection = Ctx->getWasmSection(".debug_str", SectionKind::getMetadata()); 858 DwarfLocSection = Ctx->getWasmSection(".debug_loc", SectionKind::getMetadata()); 859 DwarfAbbrevSection = Ctx->getWasmSection(".debug_abbrev", SectionKind::getMetadata(), "section_abbrev"); 860 DwarfARangesSection = Ctx->getWasmSection(".debug_aranges", SectionKind::getMetadata()); 861 DwarfRangesSection = Ctx->getWasmSection(".debug_ranges", SectionKind::getMetadata(), "debug_range"); 862 DwarfMacinfoSection = Ctx->getWasmSection(".debug_macinfo", SectionKind::getMetadata(), "debug_macinfo"); 863 DwarfAddrSection = Ctx->getWasmSection(".debug_addr", SectionKind::getMetadata()); 864 DwarfCUIndexSection = Ctx->getWasmSection(".debug_cu_index", SectionKind::getMetadata()); 865 DwarfTUIndexSection = Ctx->getWasmSection(".debug_tu_index", SectionKind::getMetadata()); 866 DwarfInfoSection = Ctx->getWasmSection(".debug_info", SectionKind::getMetadata(), "section_info"); 867 DwarfFrameSection = Ctx->getWasmSection(".debug_frame", SectionKind::getMetadata()); 868 DwarfPubNamesSection = Ctx->getWasmSection(".debug_pubnames", SectionKind::getMetadata()); 869 DwarfPubTypesSection = Ctx->getWasmSection(".debug_pubtypes", SectionKind::getMetadata()); 870 871 // TODO: Define more sections. 872 } 873 874 void MCObjectFileInfo::InitMCObjectFileInfo(const Triple &TheTriple, bool PIC, 875 MCContext &ctx, 876 bool LargeCodeModel) { 877 PositionIndependent = PIC; 878 Ctx = &ctx; 879 880 // Common. 881 CommDirectiveSupportsAlignment = true; 882 SupportsWeakOmittedEHFrame = true; 883 SupportsCompactUnwindWithoutEHFrame = false; 884 OmitDwarfIfHaveCompactUnwind = false; 885 886 PersonalityEncoding = LSDAEncoding = FDECFIEncoding = TTypeEncoding = 887 dwarf::DW_EH_PE_absptr; 888 889 CompactUnwindDwarfEHFrameOnly = 0; 890 891 EHFrameSection = nullptr; // Created on demand. 892 CompactUnwindSection = nullptr; // Used only by selected targets. 893 DwarfAccelNamesSection = nullptr; // Used only by selected targets. 894 DwarfAccelObjCSection = nullptr; // Used only by selected targets. 895 DwarfAccelNamespaceSection = nullptr; // Used only by selected targets. 896 DwarfAccelTypesSection = nullptr; // Used only by selected targets. 897 898 TT = TheTriple; 899 900 switch (TT.getObjectFormat()) { 901 case Triple::MachO: 902 Env = IsMachO; 903 initMachOMCObjectFileInfo(TT); 904 break; 905 case Triple::COFF: 906 if (!TT.isOSWindows()) 907 report_fatal_error( 908 "Cannot initialize MC for non-Windows COFF object files."); 909 910 Env = IsCOFF; 911 initCOFFMCObjectFileInfo(TT); 912 break; 913 case Triple::ELF: 914 Env = IsELF; 915 initELFMCObjectFileInfo(TT, LargeCodeModel); 916 break; 917 case Triple::Wasm: 918 Env = IsWasm; 919 initWasmMCObjectFileInfo(TT); 920 break; 921 case Triple::UnknownObjectFormat: 922 report_fatal_error("Cannot initialize MC for unknown object file format."); 923 break; 924 } 925 } 926 927 MCSection *MCObjectFileInfo::getDwarfTypesSection(uint64_t Hash) const { 928 return Ctx->getELFSection(".debug_types", ELF::SHT_PROGBITS, ELF::SHF_GROUP, 929 0, utostr(Hash)); 930 } 931