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::ppc64: 296 case Triple::ppc64le: 297 case Triple::x86_64: 298 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | 299 (Large ? dwarf::DW_EH_PE_sdata8 : dwarf::DW_EH_PE_sdata4); 300 break; 301 case Triple::bpfel: 302 case Triple::bpfeb: 303 FDECFIEncoding = dwarf::DW_EH_PE_sdata8; 304 break; 305 default: 306 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 307 break; 308 } 309 310 switch (T.getArch()) { 311 case Triple::arm: 312 case Triple::armeb: 313 case Triple::thumb: 314 case Triple::thumbeb: 315 if (Ctx->getAsmInfo()->getExceptionHandlingType() == ExceptionHandling::ARM) 316 break; 317 // Fallthrough if not using EHABI 318 LLVM_FALLTHROUGH; 319 case Triple::ppc: 320 case Triple::x86: 321 PersonalityEncoding = PositionIndependent 322 ? dwarf::DW_EH_PE_indirect | 323 dwarf::DW_EH_PE_pcrel | 324 dwarf::DW_EH_PE_sdata4 325 : dwarf::DW_EH_PE_absptr; 326 LSDAEncoding = PositionIndependent 327 ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4 328 : dwarf::DW_EH_PE_absptr; 329 TTypeEncoding = PositionIndependent 330 ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 331 dwarf::DW_EH_PE_sdata4 332 : dwarf::DW_EH_PE_absptr; 333 break; 334 case Triple::x86_64: 335 if (PositionIndependent) { 336 PersonalityEncoding = 337 dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 338 (Large ? dwarf::DW_EH_PE_sdata8 : dwarf::DW_EH_PE_sdata4); 339 LSDAEncoding = dwarf::DW_EH_PE_pcrel | 340 (Large ? dwarf::DW_EH_PE_sdata8 : dwarf::DW_EH_PE_sdata4); 341 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 342 (Large ? dwarf::DW_EH_PE_sdata8 : dwarf::DW_EH_PE_sdata4); 343 } else { 344 PersonalityEncoding = 345 Large ? dwarf::DW_EH_PE_absptr : dwarf::DW_EH_PE_udata4; 346 LSDAEncoding = Large ? dwarf::DW_EH_PE_absptr : dwarf::DW_EH_PE_udata4; 347 TTypeEncoding = Large ? dwarf::DW_EH_PE_absptr : dwarf::DW_EH_PE_udata4; 348 } 349 break; 350 case Triple::hexagon: 351 PersonalityEncoding = dwarf::DW_EH_PE_absptr; 352 LSDAEncoding = dwarf::DW_EH_PE_absptr; 353 FDECFIEncoding = dwarf::DW_EH_PE_absptr; 354 TTypeEncoding = dwarf::DW_EH_PE_absptr; 355 if (PositionIndependent) { 356 PersonalityEncoding |= dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel; 357 LSDAEncoding |= dwarf::DW_EH_PE_pcrel; 358 FDECFIEncoding |= dwarf::DW_EH_PE_pcrel; 359 TTypeEncoding |= dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel; 360 } 361 break; 362 case Triple::aarch64: 363 case Triple::aarch64_be: 364 // The small model guarantees static code/data size < 4GB, but not where it 365 // will be in memory. Most of these could end up >2GB away so even a signed 366 // pc-relative 32-bit address is insufficient, theoretically. 367 if (PositionIndependent) { 368 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 369 dwarf::DW_EH_PE_sdata8; 370 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8; 371 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 372 dwarf::DW_EH_PE_sdata8; 373 } else { 374 PersonalityEncoding = dwarf::DW_EH_PE_absptr; 375 LSDAEncoding = dwarf::DW_EH_PE_absptr; 376 TTypeEncoding = dwarf::DW_EH_PE_absptr; 377 } 378 break; 379 case Triple::lanai: 380 LSDAEncoding = dwarf::DW_EH_PE_absptr; 381 PersonalityEncoding = dwarf::DW_EH_PE_absptr; 382 TTypeEncoding = dwarf::DW_EH_PE_absptr; 383 break; 384 case Triple::mips: 385 case Triple::mipsel: 386 case Triple::mips64: 387 case Triple::mips64el: 388 // MIPS uses indirect pointer to refer personality functions and types, so 389 // that the eh_frame section can be read-only. DW.ref.personality will be 390 // generated for relocation. 391 PersonalityEncoding = dwarf::DW_EH_PE_indirect; 392 // FIXME: The N64 ABI probably ought to use DW_EH_PE_sdata8 but we can't 393 // identify N64 from just a triple. 394 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 395 dwarf::DW_EH_PE_sdata4; 396 // We don't support PC-relative LSDA references in GAS so we use the default 397 // DW_EH_PE_absptr for those. 398 399 // FreeBSD must be explicit about the data size and using pcrel since it's 400 // assembler/linker won't do the automatic conversion that the Linux tools 401 // do. 402 if (T.isOSFreeBSD()) { 403 PersonalityEncoding |= dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 404 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 405 } 406 break; 407 case Triple::ppc64: 408 case Triple::ppc64le: 409 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 410 dwarf::DW_EH_PE_udata8; 411 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8; 412 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 413 dwarf::DW_EH_PE_udata8; 414 break; 415 case Triple::sparcel: 416 case Triple::sparc: 417 if (PositionIndependent) { 418 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 419 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 420 dwarf::DW_EH_PE_sdata4; 421 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 422 dwarf::DW_EH_PE_sdata4; 423 } else { 424 LSDAEncoding = dwarf::DW_EH_PE_absptr; 425 PersonalityEncoding = dwarf::DW_EH_PE_absptr; 426 TTypeEncoding = dwarf::DW_EH_PE_absptr; 427 } 428 break; 429 case Triple::sparcv9: 430 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 431 if (PositionIndependent) { 432 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 433 dwarf::DW_EH_PE_sdata4; 434 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 435 dwarf::DW_EH_PE_sdata4; 436 } else { 437 PersonalityEncoding = dwarf::DW_EH_PE_absptr; 438 TTypeEncoding = dwarf::DW_EH_PE_absptr; 439 } 440 break; 441 case Triple::systemz: 442 // All currently-defined code models guarantee that 4-byte PC-relative 443 // values will be in range. 444 if (PositionIndependent) { 445 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 446 dwarf::DW_EH_PE_sdata4; 447 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 448 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 449 dwarf::DW_EH_PE_sdata4; 450 } else { 451 PersonalityEncoding = dwarf::DW_EH_PE_absptr; 452 LSDAEncoding = dwarf::DW_EH_PE_absptr; 453 TTypeEncoding = dwarf::DW_EH_PE_absptr; 454 } 455 break; 456 default: 457 break; 458 } 459 460 unsigned EHSectionType = T.getArch() == Triple::x86_64 461 ? ELF::SHT_X86_64_UNWIND 462 : ELF::SHT_PROGBITS; 463 464 // Solaris requires different flags for .eh_frame to seemingly every other 465 // platform. 466 unsigned EHSectionFlags = ELF::SHF_ALLOC; 467 if (T.isOSSolaris() && T.getArch() != Triple::x86_64) 468 EHSectionFlags |= ELF::SHF_WRITE; 469 470 // ELF 471 BSSSection = Ctx->getELFSection(".bss", ELF::SHT_NOBITS, 472 ELF::SHF_WRITE | ELF::SHF_ALLOC); 473 474 TextSection = Ctx->getELFSection(".text", ELF::SHT_PROGBITS, 475 ELF::SHF_EXECINSTR | ELF::SHF_ALLOC); 476 477 DataSection = Ctx->getELFSection(".data", ELF::SHT_PROGBITS, 478 ELF::SHF_WRITE | ELF::SHF_ALLOC); 479 480 ReadOnlySection = 481 Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); 482 483 TLSDataSection = 484 Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS, 485 ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE); 486 487 TLSBSSSection = Ctx->getELFSection( 488 ".tbss", ELF::SHT_NOBITS, ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE); 489 490 DataRelROSection = Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS, 491 ELF::SHF_ALLOC | ELF::SHF_WRITE); 492 493 MergeableConst4Section = 494 Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS, 495 ELF::SHF_ALLOC | ELF::SHF_MERGE, 4, ""); 496 497 MergeableConst8Section = 498 Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS, 499 ELF::SHF_ALLOC | ELF::SHF_MERGE, 8, ""); 500 501 MergeableConst16Section = 502 Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS, 503 ELF::SHF_ALLOC | ELF::SHF_MERGE, 16, ""); 504 505 MergeableConst32Section = 506 Ctx->getELFSection(".rodata.cst32", ELF::SHT_PROGBITS, 507 ELF::SHF_ALLOC | ELF::SHF_MERGE, 32, ""); 508 509 // Exception Handling Sections. 510 511 // FIXME: We're emitting LSDA info into a readonly section on ELF, even though 512 // it contains relocatable pointers. In PIC mode, this is probably a big 513 // runtime hit for C++ apps. Either the contents of the LSDA need to be 514 // adjusted or this should be a data section. 515 LSDASection = Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS, 516 ELF::SHF_ALLOC); 517 518 COFFDebugSymbolsSection = nullptr; 519 COFFDebugTypesSection = nullptr; 520 521 unsigned DebugSecType = ELF::SHT_PROGBITS; 522 523 // MIPS .debug_* sections should have SHT_MIPS_DWARF section type 524 // to distinguish among sections contain DWARF and ECOFF debug formats. 525 // Sections with ECOFF debug format are obsoleted and marked by SHT_PROGBITS. 526 if (T.getArch() == Triple::mips || T.getArch() == Triple::mipsel || 527 T.getArch() == Triple::mips64 || T.getArch() == Triple::mips64el) 528 DebugSecType = ELF::SHT_MIPS_DWARF; 529 530 // Debug Info Sections. 531 DwarfAbbrevSection = 532 Ctx->getELFSection(".debug_abbrev", DebugSecType, 0); 533 DwarfInfoSection = Ctx->getELFSection(".debug_info", DebugSecType, 0); 534 DwarfLineSection = Ctx->getELFSection(".debug_line", DebugSecType, 0); 535 DwarfLineStrSection = 536 Ctx->getELFSection(".debug_line_str", DebugSecType, 537 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, ""); 538 DwarfFrameSection = Ctx->getELFSection(".debug_frame", DebugSecType, 0); 539 DwarfPubNamesSection = 540 Ctx->getELFSection(".debug_pubnames", DebugSecType, 0); 541 DwarfPubTypesSection = 542 Ctx->getELFSection(".debug_pubtypes", DebugSecType, 0); 543 DwarfGnuPubNamesSection = 544 Ctx->getELFSection(".debug_gnu_pubnames", DebugSecType, 0); 545 DwarfGnuPubTypesSection = 546 Ctx->getELFSection(".debug_gnu_pubtypes", DebugSecType, 0); 547 DwarfStrSection = 548 Ctx->getELFSection(".debug_str", DebugSecType, 549 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, ""); 550 DwarfLocSection = Ctx->getELFSection(".debug_loc", DebugSecType, 0); 551 DwarfARangesSection = 552 Ctx->getELFSection(".debug_aranges", DebugSecType, 0); 553 DwarfRangesSection = 554 Ctx->getELFSection(".debug_ranges", DebugSecType, 0); 555 DwarfMacinfoSection = 556 Ctx->getELFSection(".debug_macinfo", DebugSecType, 0); 557 558 // DWARF5 Experimental Debug Info 559 560 // Accelerator Tables 561 DwarfAccelNamesSection = 562 Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0); 563 DwarfAccelObjCSection = 564 Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0); 565 DwarfAccelNamespaceSection = 566 Ctx->getELFSection(".apple_namespaces", ELF::SHT_PROGBITS, 0); 567 DwarfAccelTypesSection = 568 Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0); 569 570 // String Offset and Address Sections 571 DwarfStrOffSection = 572 Ctx->getELFSection(".debug_str_offsets", DebugSecType, 0); 573 DwarfAddrSection = Ctx->getELFSection(".debug_addr", DebugSecType, 0); 574 575 // Fission Sections 576 DwarfInfoDWOSection = 577 Ctx->getELFSection(".debug_info.dwo", DebugSecType, 0); 578 DwarfTypesDWOSection = 579 Ctx->getELFSection(".debug_types.dwo", DebugSecType, 0); 580 DwarfAbbrevDWOSection = 581 Ctx->getELFSection(".debug_abbrev.dwo", DebugSecType, 0); 582 DwarfStrDWOSection = 583 Ctx->getELFSection(".debug_str.dwo", DebugSecType, 584 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, ""); 585 DwarfLineDWOSection = 586 Ctx->getELFSection(".debug_line.dwo", DebugSecType, 0); 587 DwarfLocDWOSection = 588 Ctx->getELFSection(".debug_loc.dwo", DebugSecType, 0); 589 DwarfStrOffDWOSection = 590 Ctx->getELFSection(".debug_str_offsets.dwo", DebugSecType, 0); 591 592 // DWP Sections 593 DwarfCUIndexSection = 594 Ctx->getELFSection(".debug_cu_index", DebugSecType, 0); 595 DwarfTUIndexSection = 596 Ctx->getELFSection(".debug_tu_index", DebugSecType, 0); 597 598 StackMapSection = 599 Ctx->getELFSection(".llvm_stackmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); 600 601 FaultMapSection = 602 Ctx->getELFSection(".llvm_faultmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); 603 604 EHFrameSection = 605 Ctx->getELFSection(".eh_frame", EHSectionType, EHSectionFlags); 606 607 StackSizesSection = Ctx->getELFSection(".stack_sizes", ELF::SHT_PROGBITS, 0); 608 } 609 610 void MCObjectFileInfo::initCOFFMCObjectFileInfo(const Triple &T) { 611 EHFrameSection = Ctx->getCOFFSection( 612 ".eh_frame", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 613 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE, 614 SectionKind::getData()); 615 616 // Set the `IMAGE_SCN_MEM_16BIT` flag when compiling for thumb mode. This is 617 // used to indicate to the linker that the text segment contains thumb instructions 618 // and to set the ISA selection bit for calls accordingly. 619 const bool IsThumb = T.getArch() == Triple::thumb; 620 621 CommDirectiveSupportsAlignment = true; 622 623 // COFF 624 BSSSection = Ctx->getCOFFSection( 625 ".bss", COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA | 626 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE, 627 SectionKind::getBSS()); 628 TextSection = Ctx->getCOFFSection( 629 ".text", 630 (IsThumb ? COFF::IMAGE_SCN_MEM_16BIT : (COFF::SectionCharacteristics)0) | 631 COFF::IMAGE_SCN_CNT_CODE | COFF::IMAGE_SCN_MEM_EXECUTE | 632 COFF::IMAGE_SCN_MEM_READ, 633 SectionKind::getText()); 634 DataSection = Ctx->getCOFFSection( 635 ".data", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ | 636 COFF::IMAGE_SCN_MEM_WRITE, 637 SectionKind::getData()); 638 ReadOnlySection = Ctx->getCOFFSection( 639 ".rdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, 640 SectionKind::getReadOnly()); 641 642 // FIXME: We're emitting LSDA info into a readonly section on COFF, even 643 // though it contains relocatable pointers. In PIC mode, this is probably a 644 // big runtime hit for C++ apps. Either the contents of the LSDA need to be 645 // adjusted or this should be a data section. 646 if (T.getArch() == Triple::x86_64) { 647 // On Windows 64 with SEH, the LSDA is emitted into the .xdata section 648 LSDASection = nullptr; 649 } else { 650 LSDASection = Ctx->getCOFFSection(".gcc_except_table", 651 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 652 COFF::IMAGE_SCN_MEM_READ, 653 SectionKind::getReadOnly()); 654 } 655 656 // Debug info. 657 COFFDebugSymbolsSection = 658 Ctx->getCOFFSection(".debug$S", (COFF::IMAGE_SCN_MEM_DISCARDABLE | 659 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 660 COFF::IMAGE_SCN_MEM_READ), 661 SectionKind::getMetadata()); 662 COFFDebugTypesSection = 663 Ctx->getCOFFSection(".debug$T", (COFF::IMAGE_SCN_MEM_DISCARDABLE | 664 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 665 COFF::IMAGE_SCN_MEM_READ), 666 SectionKind::getMetadata()); 667 COFFGlobalTypeHashesSection = Ctx->getCOFFSection( 668 ".debug$H", 669 (COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 670 COFF::IMAGE_SCN_MEM_READ), 671 SectionKind::getMetadata()); 672 673 DwarfAbbrevSection = Ctx->getCOFFSection( 674 ".debug_abbrev", 675 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 676 COFF::IMAGE_SCN_MEM_READ, 677 SectionKind::getMetadata(), "section_abbrev"); 678 DwarfInfoSection = Ctx->getCOFFSection( 679 ".debug_info", 680 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 681 COFF::IMAGE_SCN_MEM_READ, 682 SectionKind::getMetadata(), "section_info"); 683 DwarfLineSection = Ctx->getCOFFSection( 684 ".debug_line", 685 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 686 COFF::IMAGE_SCN_MEM_READ, 687 SectionKind::getMetadata(), "section_line"); 688 DwarfLineStrSection = Ctx->getCOFFSection( 689 ".debug_line_str", 690 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 691 COFF::IMAGE_SCN_MEM_READ, 692 SectionKind::getMetadata(), "section_line_str"); 693 DwarfFrameSection = Ctx->getCOFFSection( 694 ".debug_frame", 695 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 696 COFF::IMAGE_SCN_MEM_READ, 697 SectionKind::getMetadata()); 698 DwarfPubNamesSection = Ctx->getCOFFSection( 699 ".debug_pubnames", 700 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 701 COFF::IMAGE_SCN_MEM_READ, 702 SectionKind::getMetadata()); 703 DwarfPubTypesSection = Ctx->getCOFFSection( 704 ".debug_pubtypes", 705 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 706 COFF::IMAGE_SCN_MEM_READ, 707 SectionKind::getMetadata()); 708 DwarfGnuPubNamesSection = Ctx->getCOFFSection( 709 ".debug_gnu_pubnames", 710 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 711 COFF::IMAGE_SCN_MEM_READ, 712 SectionKind::getMetadata()); 713 DwarfGnuPubTypesSection = Ctx->getCOFFSection( 714 ".debug_gnu_pubtypes", 715 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 716 COFF::IMAGE_SCN_MEM_READ, 717 SectionKind::getMetadata()); 718 DwarfStrSection = Ctx->getCOFFSection( 719 ".debug_str", 720 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 721 COFF::IMAGE_SCN_MEM_READ, 722 SectionKind::getMetadata(), "info_string"); 723 DwarfStrOffSection = Ctx->getCOFFSection( 724 ".debug_str_offsets", 725 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 726 COFF::IMAGE_SCN_MEM_READ, 727 SectionKind::getMetadata(), "section_str_off"); 728 DwarfLocSection = Ctx->getCOFFSection( 729 ".debug_loc", 730 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 731 COFF::IMAGE_SCN_MEM_READ, 732 SectionKind::getMetadata(), "section_debug_loc"); 733 DwarfARangesSection = Ctx->getCOFFSection( 734 ".debug_aranges", 735 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 736 COFF::IMAGE_SCN_MEM_READ, 737 SectionKind::getMetadata()); 738 DwarfRangesSection = Ctx->getCOFFSection( 739 ".debug_ranges", 740 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 741 COFF::IMAGE_SCN_MEM_READ, 742 SectionKind::getMetadata(), "debug_range"); 743 DwarfMacinfoSection = Ctx->getCOFFSection( 744 ".debug_macinfo", 745 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 746 COFF::IMAGE_SCN_MEM_READ, 747 SectionKind::getMetadata(), "debug_macinfo"); 748 DwarfInfoDWOSection = Ctx->getCOFFSection( 749 ".debug_info.dwo", 750 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 751 COFF::IMAGE_SCN_MEM_READ, 752 SectionKind::getMetadata(), "section_info_dwo"); 753 DwarfTypesDWOSection = Ctx->getCOFFSection( 754 ".debug_types.dwo", 755 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 756 COFF::IMAGE_SCN_MEM_READ, 757 SectionKind::getMetadata(), "section_types_dwo"); 758 DwarfAbbrevDWOSection = Ctx->getCOFFSection( 759 ".debug_abbrev.dwo", 760 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 761 COFF::IMAGE_SCN_MEM_READ, 762 SectionKind::getMetadata(), "section_abbrev_dwo"); 763 DwarfStrDWOSection = Ctx->getCOFFSection( 764 ".debug_str.dwo", 765 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 766 COFF::IMAGE_SCN_MEM_READ, 767 SectionKind::getMetadata(), "skel_string"); 768 DwarfLineDWOSection = Ctx->getCOFFSection( 769 ".debug_line.dwo", 770 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 771 COFF::IMAGE_SCN_MEM_READ, 772 SectionKind::getMetadata()); 773 DwarfLocDWOSection = Ctx->getCOFFSection( 774 ".debug_loc.dwo", 775 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 776 COFF::IMAGE_SCN_MEM_READ, 777 SectionKind::getMetadata(), "skel_loc"); 778 DwarfStrOffDWOSection = Ctx->getCOFFSection( 779 ".debug_str_offsets.dwo", 780 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 781 COFF::IMAGE_SCN_MEM_READ, 782 SectionKind::getMetadata(), "section_str_off_dwo"); 783 DwarfAddrSection = Ctx->getCOFFSection( 784 ".debug_addr", 785 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 786 COFF::IMAGE_SCN_MEM_READ, 787 SectionKind::getMetadata(), "addr_sec"); 788 DwarfCUIndexSection = Ctx->getCOFFSection( 789 ".debug_cu_index", 790 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 791 COFF::IMAGE_SCN_MEM_READ, 792 SectionKind::getMetadata()); 793 DwarfTUIndexSection = Ctx->getCOFFSection( 794 ".debug_tu_index", 795 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 796 COFF::IMAGE_SCN_MEM_READ, 797 SectionKind::getMetadata()); 798 DwarfAccelNamesSection = Ctx->getCOFFSection( 799 ".apple_names", 800 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 801 COFF::IMAGE_SCN_MEM_READ, 802 SectionKind::getMetadata(), "names_begin"); 803 DwarfAccelNamespaceSection = Ctx->getCOFFSection( 804 ".apple_namespaces", 805 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 806 COFF::IMAGE_SCN_MEM_READ, 807 SectionKind::getMetadata(), "namespac_begin"); 808 DwarfAccelTypesSection = Ctx->getCOFFSection( 809 ".apple_types", 810 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 811 COFF::IMAGE_SCN_MEM_READ, 812 SectionKind::getMetadata(), "types_begin"); 813 DwarfAccelObjCSection = Ctx->getCOFFSection( 814 ".apple_objc", 815 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 816 COFF::IMAGE_SCN_MEM_READ, 817 SectionKind::getMetadata(), "objc_begin"); 818 819 DrectveSection = Ctx->getCOFFSection( 820 ".drectve", COFF::IMAGE_SCN_LNK_INFO | COFF::IMAGE_SCN_LNK_REMOVE, 821 SectionKind::getMetadata()); 822 823 PDataSection = Ctx->getCOFFSection( 824 ".pdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, 825 SectionKind::getData()); 826 827 XDataSection = Ctx->getCOFFSection( 828 ".xdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, 829 SectionKind::getData()); 830 831 SXDataSection = Ctx->getCOFFSection(".sxdata", COFF::IMAGE_SCN_LNK_INFO, 832 SectionKind::getMetadata()); 833 834 GFIDsSection = Ctx->getCOFFSection(".gfids$y", 835 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 836 COFF::IMAGE_SCN_MEM_READ, 837 SectionKind::getMetadata()); 838 839 TLSDataSection = Ctx->getCOFFSection( 840 ".tls$", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ | 841 COFF::IMAGE_SCN_MEM_WRITE, 842 SectionKind::getData()); 843 844 StackMapSection = Ctx->getCOFFSection(".llvm_stackmaps", 845 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 846 COFF::IMAGE_SCN_MEM_READ, 847 SectionKind::getReadOnly()); 848 } 849 850 void MCObjectFileInfo::initWasmMCObjectFileInfo(const Triple &T) { 851 // TODO: Set the section types and flags. 852 TextSection = Ctx->getWasmSection(".text", SectionKind::getText()); 853 DataSection = Ctx->getWasmSection(".data", SectionKind::getData()); 854 855 // TODO: Set the section types and flags. 856 DwarfLineSection = Ctx->getWasmSection(".debug_line", SectionKind::getMetadata()); 857 DwarfLineStrSection = 858 Ctx->getWasmSection(".debug_line_str", SectionKind::getMetadata()); 859 DwarfStrSection = Ctx->getWasmSection(".debug_str", SectionKind::getMetadata()); 860 DwarfLocSection = Ctx->getWasmSection(".debug_loc", SectionKind::getMetadata()); 861 DwarfAbbrevSection = Ctx->getWasmSection(".debug_abbrev", SectionKind::getMetadata(), "section_abbrev"); 862 DwarfARangesSection = Ctx->getWasmSection(".debug_aranges", SectionKind::getMetadata()); 863 DwarfRangesSection = Ctx->getWasmSection(".debug_ranges", SectionKind::getMetadata(), "debug_range"); 864 DwarfMacinfoSection = Ctx->getWasmSection(".debug_macinfo", SectionKind::getMetadata(), "debug_macinfo"); 865 DwarfAddrSection = Ctx->getWasmSection(".debug_addr", SectionKind::getMetadata()); 866 DwarfCUIndexSection = Ctx->getWasmSection(".debug_cu_index", SectionKind::getMetadata()); 867 DwarfTUIndexSection = Ctx->getWasmSection(".debug_tu_index", SectionKind::getMetadata()); 868 DwarfInfoSection = Ctx->getWasmSection(".debug_info", SectionKind::getMetadata(), "section_info"); 869 DwarfFrameSection = Ctx->getWasmSection(".debug_frame", SectionKind::getMetadata()); 870 DwarfPubNamesSection = Ctx->getWasmSection(".debug_pubnames", SectionKind::getMetadata()); 871 DwarfPubTypesSection = Ctx->getWasmSection(".debug_pubtypes", SectionKind::getMetadata()); 872 873 // TODO: Define more sections. 874 } 875 876 void MCObjectFileInfo::InitMCObjectFileInfo(const Triple &TheTriple, bool PIC, 877 MCContext &ctx, 878 bool LargeCodeModel) { 879 PositionIndependent = PIC; 880 Ctx = &ctx; 881 882 // Common. 883 CommDirectiveSupportsAlignment = true; 884 SupportsWeakOmittedEHFrame = true; 885 SupportsCompactUnwindWithoutEHFrame = false; 886 OmitDwarfIfHaveCompactUnwind = false; 887 888 PersonalityEncoding = LSDAEncoding = FDECFIEncoding = TTypeEncoding = 889 dwarf::DW_EH_PE_absptr; 890 891 CompactUnwindDwarfEHFrameOnly = 0; 892 893 EHFrameSection = nullptr; // Created on demand. 894 CompactUnwindSection = nullptr; // Used only by selected targets. 895 DwarfAccelNamesSection = nullptr; // Used only by selected targets. 896 DwarfAccelObjCSection = nullptr; // Used only by selected targets. 897 DwarfAccelNamespaceSection = nullptr; // Used only by selected targets. 898 DwarfAccelTypesSection = nullptr; // Used only by selected targets. 899 900 TT = TheTriple; 901 902 switch (TT.getObjectFormat()) { 903 case Triple::MachO: 904 Env = IsMachO; 905 initMachOMCObjectFileInfo(TT); 906 break; 907 case Triple::COFF: 908 if (!TT.isOSWindows()) 909 report_fatal_error( 910 "Cannot initialize MC for non-Windows COFF object files."); 911 912 Env = IsCOFF; 913 initCOFFMCObjectFileInfo(TT); 914 break; 915 case Triple::ELF: 916 Env = IsELF; 917 initELFMCObjectFileInfo(TT, LargeCodeModel); 918 break; 919 case Triple::Wasm: 920 Env = IsWasm; 921 initWasmMCObjectFileInfo(TT); 922 break; 923 case Triple::UnknownObjectFormat: 924 report_fatal_error("Cannot initialize MC for unknown object file format."); 925 break; 926 } 927 } 928 929 MCSection *MCObjectFileInfo::getDwarfTypesSection(uint64_t Hash) const { 930 return Ctx->getELFSection(".debug_types", ELF::SHT_PROGBITS, ELF::SHF_GROUP, 931 0, utostr(Hash)); 932 } 933