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 ConstDataSection // .const_data 139 = Ctx->getMachOSection("__DATA", "__const", 0, 140 SectionKind::getReadOnlyWithRel()); 141 142 if (ArchTy == Triple::ppc || ArchTy == Triple::ppc64) { 143 TextCoalSection 144 = Ctx->getMachOSection("__TEXT", "__textcoal_nt", 145 MachO::S_COALESCED | 146 MachO::S_ATTR_PURE_INSTRUCTIONS, 147 SectionKind::getText()); 148 ConstTextCoalSection 149 = Ctx->getMachOSection("__TEXT", "__const_coal", 150 MachO::S_COALESCED, 151 SectionKind::getReadOnly()); 152 DataCoalSection = Ctx->getMachOSection( 153 "__DATA", "__datacoal_nt", MachO::S_COALESCED, SectionKind::getData()); 154 ConstDataCoalSection = DataCoalSection; 155 } else { 156 TextCoalSection = TextSection; 157 ConstTextCoalSection = ReadOnlySection; 158 DataCoalSection = DataSection; 159 ConstDataCoalSection = ConstDataSection; 160 } 161 162 DataCommonSection 163 = Ctx->getMachOSection("__DATA","__common", 164 MachO::S_ZEROFILL, 165 SectionKind::getBSS()); 166 DataBSSSection 167 = Ctx->getMachOSection("__DATA","__bss", MachO::S_ZEROFILL, 168 SectionKind::getBSS()); 169 170 171 LazySymbolPointerSection 172 = Ctx->getMachOSection("__DATA", "__la_symbol_ptr", 173 MachO::S_LAZY_SYMBOL_POINTERS, 174 SectionKind::getMetadata()); 175 NonLazySymbolPointerSection 176 = Ctx->getMachOSection("__DATA", "__nl_symbol_ptr", 177 MachO::S_NON_LAZY_SYMBOL_POINTERS, 178 SectionKind::getMetadata()); 179 180 ThreadLocalPointerSection 181 = Ctx->getMachOSection("__DATA", "__thread_ptr", 182 MachO::S_THREAD_LOCAL_VARIABLE_POINTERS, 183 SectionKind::getMetadata()); 184 185 // Exception Handling. 186 LSDASection = Ctx->getMachOSection("__TEXT", "__gcc_except_tab", 0, 187 SectionKind::getReadOnlyWithRel()); 188 189 COFFDebugSymbolsSection = nullptr; 190 COFFDebugTypesSection = nullptr; 191 COFFGlobalTypeHashesSection = nullptr; 192 193 if (useCompactUnwind(T)) { 194 CompactUnwindSection = 195 Ctx->getMachOSection("__LD", "__compact_unwind", MachO::S_ATTR_DEBUG, 196 SectionKind::getReadOnly()); 197 198 if (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86) 199 CompactUnwindDwarfEHFrameOnly = 0x04000000; // UNWIND_X86_64_MODE_DWARF 200 else if (T.getArch() == Triple::aarch64) 201 CompactUnwindDwarfEHFrameOnly = 0x03000000; // UNWIND_ARM64_MODE_DWARF 202 else if (T.getArch() == Triple::arm || T.getArch() == Triple::thumb) 203 CompactUnwindDwarfEHFrameOnly = 0x04000000; // UNWIND_ARM_MODE_DWARF 204 } 205 206 // Debug Information. 207 DwarfDebugNamesSection = 208 Ctx->getMachOSection("__DWARF", "__debug_names", MachO::S_ATTR_DEBUG, 209 SectionKind::getMetadata(), "debug_names_begin"); 210 DwarfAccelNamesSection = 211 Ctx->getMachOSection("__DWARF", "__apple_names", MachO::S_ATTR_DEBUG, 212 SectionKind::getMetadata(), "names_begin"); 213 DwarfAccelObjCSection = 214 Ctx->getMachOSection("__DWARF", "__apple_objc", MachO::S_ATTR_DEBUG, 215 SectionKind::getMetadata(), "objc_begin"); 216 // 16 character section limit... 217 DwarfAccelNamespaceSection = 218 Ctx->getMachOSection("__DWARF", "__apple_namespac", MachO::S_ATTR_DEBUG, 219 SectionKind::getMetadata(), "namespac_begin"); 220 DwarfAccelTypesSection = 221 Ctx->getMachOSection("__DWARF", "__apple_types", MachO::S_ATTR_DEBUG, 222 SectionKind::getMetadata(), "types_begin"); 223 224 DwarfSwiftASTSection = 225 Ctx->getMachOSection("__DWARF", "__swift_ast", MachO::S_ATTR_DEBUG, 226 SectionKind::getMetadata()); 227 228 DwarfAbbrevSection = 229 Ctx->getMachOSection("__DWARF", "__debug_abbrev", MachO::S_ATTR_DEBUG, 230 SectionKind::getMetadata(), "section_abbrev"); 231 DwarfInfoSection = 232 Ctx->getMachOSection("__DWARF", "__debug_info", MachO::S_ATTR_DEBUG, 233 SectionKind::getMetadata(), "section_info"); 234 DwarfLineSection = 235 Ctx->getMachOSection("__DWARF", "__debug_line", MachO::S_ATTR_DEBUG, 236 SectionKind::getMetadata(), "section_line"); 237 DwarfLineStrSection = 238 Ctx->getMachOSection("__DWARF", "__debug_line_str", MachO::S_ATTR_DEBUG, 239 SectionKind::getMetadata(), "section_line_str"); 240 DwarfFrameSection = 241 Ctx->getMachOSection("__DWARF", "__debug_frame", MachO::S_ATTR_DEBUG, 242 SectionKind::getMetadata()); 243 DwarfPubNamesSection = 244 Ctx->getMachOSection("__DWARF", "__debug_pubnames", MachO::S_ATTR_DEBUG, 245 SectionKind::getMetadata()); 246 DwarfPubTypesSection = 247 Ctx->getMachOSection("__DWARF", "__debug_pubtypes", MachO::S_ATTR_DEBUG, 248 SectionKind::getMetadata()); 249 DwarfGnuPubNamesSection = 250 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubn", MachO::S_ATTR_DEBUG, 251 SectionKind::getMetadata()); 252 DwarfGnuPubTypesSection = 253 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubt", MachO::S_ATTR_DEBUG, 254 SectionKind::getMetadata()); 255 DwarfStrSection = 256 Ctx->getMachOSection("__DWARF", "__debug_str", MachO::S_ATTR_DEBUG, 257 SectionKind::getMetadata(), "info_string"); 258 DwarfStrOffSection = 259 Ctx->getMachOSection("__DWARF", "__debug_str_offs", MachO::S_ATTR_DEBUG, 260 SectionKind::getMetadata(), "section_str_off"); 261 DwarfLocSection = 262 Ctx->getMachOSection("__DWARF", "__debug_loc", MachO::S_ATTR_DEBUG, 263 SectionKind::getMetadata(), "section_debug_loc"); 264 DwarfARangesSection = 265 Ctx->getMachOSection("__DWARF", "__debug_aranges", MachO::S_ATTR_DEBUG, 266 SectionKind::getMetadata()); 267 DwarfRangesSection = 268 Ctx->getMachOSection("__DWARF", "__debug_ranges", MachO::S_ATTR_DEBUG, 269 SectionKind::getMetadata(), "debug_range"); 270 DwarfMacinfoSection = 271 Ctx->getMachOSection("__DWARF", "__debug_macinfo", MachO::S_ATTR_DEBUG, 272 SectionKind::getMetadata(), "debug_macinfo"); 273 DwarfDebugInlineSection = 274 Ctx->getMachOSection("__DWARF", "__debug_inlined", MachO::S_ATTR_DEBUG, 275 SectionKind::getMetadata()); 276 DwarfCUIndexSection = 277 Ctx->getMachOSection("__DWARF", "__debug_cu_index", MachO::S_ATTR_DEBUG, 278 SectionKind::getMetadata()); 279 DwarfTUIndexSection = 280 Ctx->getMachOSection("__DWARF", "__debug_tu_index", MachO::S_ATTR_DEBUG, 281 SectionKind::getMetadata()); 282 StackMapSection = Ctx->getMachOSection("__LLVM_STACKMAPS", "__llvm_stackmaps", 283 0, SectionKind::getMetadata()); 284 285 FaultMapSection = Ctx->getMachOSection("__LLVM_FAULTMAPS", "__llvm_faultmaps", 286 0, SectionKind::getMetadata()); 287 288 TLSExtraDataSection = TLSTLVSection; 289 } 290 291 void MCObjectFileInfo::initELFMCObjectFileInfo(const Triple &T, bool Large) { 292 switch (T.getArch()) { 293 case Triple::mips: 294 case Triple::mipsel: 295 FDECFIEncoding = dwarf::DW_EH_PE_sdata4; 296 break; 297 case Triple::mips64: 298 case Triple::mips64el: 299 FDECFIEncoding = dwarf::DW_EH_PE_sdata8; 300 break; 301 case Triple::ppc64: 302 case Triple::ppc64le: 303 case Triple::x86_64: 304 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | 305 (Large ? dwarf::DW_EH_PE_sdata8 : dwarf::DW_EH_PE_sdata4); 306 break; 307 case Triple::bpfel: 308 case Triple::bpfeb: 309 FDECFIEncoding = dwarf::DW_EH_PE_sdata8; 310 break; 311 default: 312 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 313 break; 314 } 315 316 switch (T.getArch()) { 317 case Triple::arm: 318 case Triple::armeb: 319 case Triple::thumb: 320 case Triple::thumbeb: 321 if (Ctx->getAsmInfo()->getExceptionHandlingType() == ExceptionHandling::ARM) 322 break; 323 // Fallthrough if not using EHABI 324 LLVM_FALLTHROUGH; 325 case Triple::ppc: 326 case Triple::x86: 327 PersonalityEncoding = PositionIndependent 328 ? dwarf::DW_EH_PE_indirect | 329 dwarf::DW_EH_PE_pcrel | 330 dwarf::DW_EH_PE_sdata4 331 : dwarf::DW_EH_PE_absptr; 332 LSDAEncoding = PositionIndependent 333 ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4 334 : dwarf::DW_EH_PE_absptr; 335 TTypeEncoding = PositionIndependent 336 ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 337 dwarf::DW_EH_PE_sdata4 338 : dwarf::DW_EH_PE_absptr; 339 break; 340 case Triple::x86_64: 341 if (PositionIndependent) { 342 PersonalityEncoding = 343 dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 344 (Large ? dwarf::DW_EH_PE_sdata8 : dwarf::DW_EH_PE_sdata4); 345 LSDAEncoding = dwarf::DW_EH_PE_pcrel | 346 (Large ? dwarf::DW_EH_PE_sdata8 : dwarf::DW_EH_PE_sdata4); 347 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 348 (Large ? dwarf::DW_EH_PE_sdata8 : dwarf::DW_EH_PE_sdata4); 349 } else { 350 PersonalityEncoding = 351 Large ? dwarf::DW_EH_PE_absptr : dwarf::DW_EH_PE_udata4; 352 LSDAEncoding = Large ? dwarf::DW_EH_PE_absptr : dwarf::DW_EH_PE_udata4; 353 TTypeEncoding = Large ? dwarf::DW_EH_PE_absptr : dwarf::DW_EH_PE_udata4; 354 } 355 break; 356 case Triple::hexagon: 357 PersonalityEncoding = dwarf::DW_EH_PE_absptr; 358 LSDAEncoding = dwarf::DW_EH_PE_absptr; 359 FDECFIEncoding = dwarf::DW_EH_PE_absptr; 360 TTypeEncoding = dwarf::DW_EH_PE_absptr; 361 if (PositionIndependent) { 362 PersonalityEncoding |= dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel; 363 LSDAEncoding |= dwarf::DW_EH_PE_pcrel; 364 FDECFIEncoding |= dwarf::DW_EH_PE_pcrel; 365 TTypeEncoding |= dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel; 366 } 367 break; 368 case Triple::aarch64: 369 case Triple::aarch64_be: 370 // The small model guarantees static code/data size < 4GB, but not where it 371 // will be in memory. Most of these could end up >2GB away so even a signed 372 // pc-relative 32-bit address is insufficient, theoretically. 373 if (PositionIndependent) { 374 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 375 dwarf::DW_EH_PE_sdata8; 376 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8; 377 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 378 dwarf::DW_EH_PE_sdata8; 379 } else { 380 PersonalityEncoding = dwarf::DW_EH_PE_absptr; 381 LSDAEncoding = dwarf::DW_EH_PE_absptr; 382 TTypeEncoding = dwarf::DW_EH_PE_absptr; 383 } 384 break; 385 case Triple::lanai: 386 LSDAEncoding = dwarf::DW_EH_PE_absptr; 387 PersonalityEncoding = dwarf::DW_EH_PE_absptr; 388 TTypeEncoding = dwarf::DW_EH_PE_absptr; 389 break; 390 case Triple::mips: 391 case Triple::mipsel: 392 case Triple::mips64: 393 case Triple::mips64el: 394 // MIPS uses indirect pointer to refer personality functions and types, so 395 // that the eh_frame section can be read-only. DW.ref.personality will be 396 // generated for relocation. 397 PersonalityEncoding = dwarf::DW_EH_PE_indirect; 398 // FIXME: The N64 ABI probably ought to use DW_EH_PE_sdata8 but we can't 399 // identify N64 from just a triple. 400 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 401 dwarf::DW_EH_PE_sdata4; 402 // We don't support PC-relative LSDA references in GAS so we use the default 403 // DW_EH_PE_absptr for those. 404 405 // FreeBSD must be explicit about the data size and using pcrel since it's 406 // assembler/linker won't do the automatic conversion that the Linux tools 407 // do. 408 if (T.isOSFreeBSD()) { 409 PersonalityEncoding |= dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 410 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 411 } 412 break; 413 case Triple::ppc64: 414 case Triple::ppc64le: 415 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 416 dwarf::DW_EH_PE_udata8; 417 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8; 418 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 419 dwarf::DW_EH_PE_udata8; 420 break; 421 case Triple::sparcel: 422 case Triple::sparc: 423 if (PositionIndependent) { 424 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 425 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 426 dwarf::DW_EH_PE_sdata4; 427 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 428 dwarf::DW_EH_PE_sdata4; 429 } else { 430 LSDAEncoding = dwarf::DW_EH_PE_absptr; 431 PersonalityEncoding = dwarf::DW_EH_PE_absptr; 432 TTypeEncoding = dwarf::DW_EH_PE_absptr; 433 } 434 break; 435 case Triple::sparcv9: 436 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 437 if (PositionIndependent) { 438 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 439 dwarf::DW_EH_PE_sdata4; 440 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 441 dwarf::DW_EH_PE_sdata4; 442 } else { 443 PersonalityEncoding = dwarf::DW_EH_PE_absptr; 444 TTypeEncoding = dwarf::DW_EH_PE_absptr; 445 } 446 break; 447 case Triple::systemz: 448 // All currently-defined code models guarantee that 4-byte PC-relative 449 // values will be in range. 450 if (PositionIndependent) { 451 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 452 dwarf::DW_EH_PE_sdata4; 453 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 454 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 455 dwarf::DW_EH_PE_sdata4; 456 } else { 457 PersonalityEncoding = dwarf::DW_EH_PE_absptr; 458 LSDAEncoding = dwarf::DW_EH_PE_absptr; 459 TTypeEncoding = dwarf::DW_EH_PE_absptr; 460 } 461 break; 462 default: 463 break; 464 } 465 466 unsigned EHSectionType = T.getArch() == Triple::x86_64 467 ? ELF::SHT_X86_64_UNWIND 468 : ELF::SHT_PROGBITS; 469 470 // Solaris requires different flags for .eh_frame to seemingly every other 471 // platform. 472 unsigned EHSectionFlags = ELF::SHF_ALLOC; 473 if (T.isOSSolaris() && T.getArch() != Triple::x86_64) 474 EHSectionFlags |= ELF::SHF_WRITE; 475 476 // ELF 477 BSSSection = Ctx->getELFSection(".bss", ELF::SHT_NOBITS, 478 ELF::SHF_WRITE | ELF::SHF_ALLOC); 479 480 TextSection = Ctx->getELFSection(".text", ELF::SHT_PROGBITS, 481 ELF::SHF_EXECINSTR | ELF::SHF_ALLOC); 482 483 DataSection = Ctx->getELFSection(".data", ELF::SHT_PROGBITS, 484 ELF::SHF_WRITE | ELF::SHF_ALLOC); 485 486 ReadOnlySection = 487 Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); 488 489 TLSDataSection = 490 Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS, 491 ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE); 492 493 TLSBSSSection = Ctx->getELFSection( 494 ".tbss", ELF::SHT_NOBITS, ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE); 495 496 DataRelROSection = Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS, 497 ELF::SHF_ALLOC | ELF::SHF_WRITE); 498 499 MergeableConst4Section = 500 Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS, 501 ELF::SHF_ALLOC | ELF::SHF_MERGE, 4, ""); 502 503 MergeableConst8Section = 504 Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS, 505 ELF::SHF_ALLOC | ELF::SHF_MERGE, 8, ""); 506 507 MergeableConst16Section = 508 Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS, 509 ELF::SHF_ALLOC | ELF::SHF_MERGE, 16, ""); 510 511 MergeableConst32Section = 512 Ctx->getELFSection(".rodata.cst32", ELF::SHT_PROGBITS, 513 ELF::SHF_ALLOC | ELF::SHF_MERGE, 32, ""); 514 515 // Exception Handling Sections. 516 517 // FIXME: We're emitting LSDA info into a readonly section on ELF, even though 518 // it contains relocatable pointers. In PIC mode, this is probably a big 519 // runtime hit for C++ apps. Either the contents of the LSDA need to be 520 // adjusted or this should be a data section. 521 LSDASection = Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS, 522 ELF::SHF_ALLOC); 523 524 COFFDebugSymbolsSection = nullptr; 525 COFFDebugTypesSection = nullptr; 526 527 unsigned DebugSecType = ELF::SHT_PROGBITS; 528 529 // MIPS .debug_* sections should have SHT_MIPS_DWARF section type 530 // to distinguish among sections contain DWARF and ECOFF debug formats. 531 // Sections with ECOFF debug format are obsoleted and marked by SHT_PROGBITS. 532 if (T.isMIPS()) 533 DebugSecType = ELF::SHT_MIPS_DWARF; 534 535 // Debug Info Sections. 536 DwarfAbbrevSection = 537 Ctx->getELFSection(".debug_abbrev", DebugSecType, 0); 538 DwarfInfoSection = Ctx->getELFSection(".debug_info", DebugSecType, 0); 539 DwarfLineSection = Ctx->getELFSection(".debug_line", DebugSecType, 0); 540 DwarfLineStrSection = 541 Ctx->getELFSection(".debug_line_str", DebugSecType, 542 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, ""); 543 DwarfFrameSection = Ctx->getELFSection(".debug_frame", DebugSecType, 0); 544 DwarfPubNamesSection = 545 Ctx->getELFSection(".debug_pubnames", DebugSecType, 0); 546 DwarfPubTypesSection = 547 Ctx->getELFSection(".debug_pubtypes", DebugSecType, 0); 548 DwarfGnuPubNamesSection = 549 Ctx->getELFSection(".debug_gnu_pubnames", DebugSecType, 0); 550 DwarfGnuPubTypesSection = 551 Ctx->getELFSection(".debug_gnu_pubtypes", DebugSecType, 0); 552 DwarfStrSection = 553 Ctx->getELFSection(".debug_str", DebugSecType, 554 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, ""); 555 DwarfLocSection = Ctx->getELFSection(".debug_loc", DebugSecType, 0); 556 DwarfARangesSection = 557 Ctx->getELFSection(".debug_aranges", DebugSecType, 0); 558 DwarfRangesSection = 559 Ctx->getELFSection(".debug_ranges", DebugSecType, 0); 560 DwarfMacinfoSection = 561 Ctx->getELFSection(".debug_macinfo", DebugSecType, 0); 562 563 // DWARF5 Experimental Debug Info 564 565 // Accelerator Tables 566 DwarfDebugNamesSection = 567 Ctx->getELFSection(".debug_names", ELF::SHT_PROGBITS, 0); 568 DwarfAccelNamesSection = 569 Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0); 570 DwarfAccelObjCSection = 571 Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0); 572 DwarfAccelNamespaceSection = 573 Ctx->getELFSection(".apple_namespaces", ELF::SHT_PROGBITS, 0); 574 DwarfAccelTypesSection = 575 Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0); 576 577 // String Offset and Address Sections 578 DwarfStrOffSection = 579 Ctx->getELFSection(".debug_str_offsets", DebugSecType, 0); 580 DwarfAddrSection = Ctx->getELFSection(".debug_addr", DebugSecType, 0); 581 582 // Fission Sections 583 DwarfInfoDWOSection = 584 Ctx->getELFSection(".debug_info.dwo", DebugSecType, 0); 585 DwarfTypesDWOSection = 586 Ctx->getELFSection(".debug_types.dwo", DebugSecType, 0); 587 DwarfAbbrevDWOSection = 588 Ctx->getELFSection(".debug_abbrev.dwo", DebugSecType, 0); 589 DwarfStrDWOSection = 590 Ctx->getELFSection(".debug_str.dwo", DebugSecType, 591 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, ""); 592 DwarfLineDWOSection = 593 Ctx->getELFSection(".debug_line.dwo", DebugSecType, 0); 594 DwarfLocDWOSection = 595 Ctx->getELFSection(".debug_loc.dwo", DebugSecType, 0); 596 DwarfStrOffDWOSection = 597 Ctx->getELFSection(".debug_str_offsets.dwo", DebugSecType, 0); 598 599 // DWP Sections 600 DwarfCUIndexSection = 601 Ctx->getELFSection(".debug_cu_index", DebugSecType, 0); 602 DwarfTUIndexSection = 603 Ctx->getELFSection(".debug_tu_index", DebugSecType, 0); 604 605 StackMapSection = 606 Ctx->getELFSection(".llvm_stackmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); 607 608 FaultMapSection = 609 Ctx->getELFSection(".llvm_faultmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); 610 611 EHFrameSection = 612 Ctx->getELFSection(".eh_frame", EHSectionType, EHSectionFlags); 613 614 StackSizesSection = Ctx->getELFSection(".stack_sizes", ELF::SHT_PROGBITS, 0); 615 } 616 617 void MCObjectFileInfo::initCOFFMCObjectFileInfo(const Triple &T) { 618 EHFrameSection = Ctx->getCOFFSection( 619 ".eh_frame", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 620 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE, 621 SectionKind::getData()); 622 623 // Set the `IMAGE_SCN_MEM_16BIT` flag when compiling for thumb mode. This is 624 // used to indicate to the linker that the text segment contains thumb instructions 625 // and to set the ISA selection bit for calls accordingly. 626 const bool IsThumb = T.getArch() == Triple::thumb; 627 628 CommDirectiveSupportsAlignment = true; 629 630 // COFF 631 BSSSection = Ctx->getCOFFSection( 632 ".bss", COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA | 633 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE, 634 SectionKind::getBSS()); 635 TextSection = Ctx->getCOFFSection( 636 ".text", 637 (IsThumb ? COFF::IMAGE_SCN_MEM_16BIT : (COFF::SectionCharacteristics)0) | 638 COFF::IMAGE_SCN_CNT_CODE | COFF::IMAGE_SCN_MEM_EXECUTE | 639 COFF::IMAGE_SCN_MEM_READ, 640 SectionKind::getText()); 641 DataSection = Ctx->getCOFFSection( 642 ".data", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ | 643 COFF::IMAGE_SCN_MEM_WRITE, 644 SectionKind::getData()); 645 ReadOnlySection = Ctx->getCOFFSection( 646 ".rdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, 647 SectionKind::getReadOnly()); 648 649 // FIXME: We're emitting LSDA info into a readonly section on COFF, even 650 // though it contains relocatable pointers. In PIC mode, this is probably a 651 // big runtime hit for C++ apps. Either the contents of the LSDA need to be 652 // adjusted or this should be a data section. 653 if (T.getArch() == Triple::x86_64) { 654 // On Windows 64 with SEH, the LSDA is emitted into the .xdata section 655 LSDASection = nullptr; 656 } else { 657 LSDASection = Ctx->getCOFFSection(".gcc_except_table", 658 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 659 COFF::IMAGE_SCN_MEM_READ, 660 SectionKind::getReadOnly()); 661 } 662 663 // Debug info. 664 COFFDebugSymbolsSection = 665 Ctx->getCOFFSection(".debug$S", (COFF::IMAGE_SCN_MEM_DISCARDABLE | 666 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 667 COFF::IMAGE_SCN_MEM_READ), 668 SectionKind::getMetadata()); 669 COFFDebugTypesSection = 670 Ctx->getCOFFSection(".debug$T", (COFF::IMAGE_SCN_MEM_DISCARDABLE | 671 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 672 COFF::IMAGE_SCN_MEM_READ), 673 SectionKind::getMetadata()); 674 COFFGlobalTypeHashesSection = Ctx->getCOFFSection( 675 ".debug$H", 676 (COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 677 COFF::IMAGE_SCN_MEM_READ), 678 SectionKind::getMetadata()); 679 680 DwarfAbbrevSection = Ctx->getCOFFSection( 681 ".debug_abbrev", 682 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 683 COFF::IMAGE_SCN_MEM_READ, 684 SectionKind::getMetadata(), "section_abbrev"); 685 DwarfInfoSection = Ctx->getCOFFSection( 686 ".debug_info", 687 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 688 COFF::IMAGE_SCN_MEM_READ, 689 SectionKind::getMetadata(), "section_info"); 690 DwarfLineSection = Ctx->getCOFFSection( 691 ".debug_line", 692 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 693 COFF::IMAGE_SCN_MEM_READ, 694 SectionKind::getMetadata(), "section_line"); 695 DwarfLineStrSection = Ctx->getCOFFSection( 696 ".debug_line_str", 697 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 698 COFF::IMAGE_SCN_MEM_READ, 699 SectionKind::getMetadata(), "section_line_str"); 700 DwarfFrameSection = Ctx->getCOFFSection( 701 ".debug_frame", 702 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 703 COFF::IMAGE_SCN_MEM_READ, 704 SectionKind::getMetadata()); 705 DwarfPubNamesSection = Ctx->getCOFFSection( 706 ".debug_pubnames", 707 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 708 COFF::IMAGE_SCN_MEM_READ, 709 SectionKind::getMetadata()); 710 DwarfPubTypesSection = Ctx->getCOFFSection( 711 ".debug_pubtypes", 712 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 713 COFF::IMAGE_SCN_MEM_READ, 714 SectionKind::getMetadata()); 715 DwarfGnuPubNamesSection = Ctx->getCOFFSection( 716 ".debug_gnu_pubnames", 717 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 718 COFF::IMAGE_SCN_MEM_READ, 719 SectionKind::getMetadata()); 720 DwarfGnuPubTypesSection = Ctx->getCOFFSection( 721 ".debug_gnu_pubtypes", 722 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 723 COFF::IMAGE_SCN_MEM_READ, 724 SectionKind::getMetadata()); 725 DwarfStrSection = Ctx->getCOFFSection( 726 ".debug_str", 727 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 728 COFF::IMAGE_SCN_MEM_READ, 729 SectionKind::getMetadata(), "info_string"); 730 DwarfStrOffSection = Ctx->getCOFFSection( 731 ".debug_str_offsets", 732 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 733 COFF::IMAGE_SCN_MEM_READ, 734 SectionKind::getMetadata(), "section_str_off"); 735 DwarfLocSection = Ctx->getCOFFSection( 736 ".debug_loc", 737 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 738 COFF::IMAGE_SCN_MEM_READ, 739 SectionKind::getMetadata(), "section_debug_loc"); 740 DwarfARangesSection = Ctx->getCOFFSection( 741 ".debug_aranges", 742 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 743 COFF::IMAGE_SCN_MEM_READ, 744 SectionKind::getMetadata()); 745 DwarfRangesSection = Ctx->getCOFFSection( 746 ".debug_ranges", 747 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 748 COFF::IMAGE_SCN_MEM_READ, 749 SectionKind::getMetadata(), "debug_range"); 750 DwarfMacinfoSection = Ctx->getCOFFSection( 751 ".debug_macinfo", 752 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 753 COFF::IMAGE_SCN_MEM_READ, 754 SectionKind::getMetadata(), "debug_macinfo"); 755 DwarfInfoDWOSection = Ctx->getCOFFSection( 756 ".debug_info.dwo", 757 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 758 COFF::IMAGE_SCN_MEM_READ, 759 SectionKind::getMetadata(), "section_info_dwo"); 760 DwarfTypesDWOSection = Ctx->getCOFFSection( 761 ".debug_types.dwo", 762 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 763 COFF::IMAGE_SCN_MEM_READ, 764 SectionKind::getMetadata(), "section_types_dwo"); 765 DwarfAbbrevDWOSection = Ctx->getCOFFSection( 766 ".debug_abbrev.dwo", 767 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 768 COFF::IMAGE_SCN_MEM_READ, 769 SectionKind::getMetadata(), "section_abbrev_dwo"); 770 DwarfStrDWOSection = Ctx->getCOFFSection( 771 ".debug_str.dwo", 772 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 773 COFF::IMAGE_SCN_MEM_READ, 774 SectionKind::getMetadata(), "skel_string"); 775 DwarfLineDWOSection = Ctx->getCOFFSection( 776 ".debug_line.dwo", 777 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 778 COFF::IMAGE_SCN_MEM_READ, 779 SectionKind::getMetadata()); 780 DwarfLocDWOSection = Ctx->getCOFFSection( 781 ".debug_loc.dwo", 782 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 783 COFF::IMAGE_SCN_MEM_READ, 784 SectionKind::getMetadata(), "skel_loc"); 785 DwarfStrOffDWOSection = Ctx->getCOFFSection( 786 ".debug_str_offsets.dwo", 787 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 788 COFF::IMAGE_SCN_MEM_READ, 789 SectionKind::getMetadata(), "section_str_off_dwo"); 790 DwarfAddrSection = Ctx->getCOFFSection( 791 ".debug_addr", 792 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 793 COFF::IMAGE_SCN_MEM_READ, 794 SectionKind::getMetadata(), "addr_sec"); 795 DwarfCUIndexSection = Ctx->getCOFFSection( 796 ".debug_cu_index", 797 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 798 COFF::IMAGE_SCN_MEM_READ, 799 SectionKind::getMetadata()); 800 DwarfTUIndexSection = Ctx->getCOFFSection( 801 ".debug_tu_index", 802 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 803 COFF::IMAGE_SCN_MEM_READ, 804 SectionKind::getMetadata()); 805 DwarfDebugNamesSection = Ctx->getCOFFSection( 806 ".debug_names", 807 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 808 COFF::IMAGE_SCN_MEM_READ, 809 SectionKind::getMetadata(), "debug_names_begin"); 810 DwarfAccelNamesSection = Ctx->getCOFFSection( 811 ".apple_names", 812 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 813 COFF::IMAGE_SCN_MEM_READ, 814 SectionKind::getMetadata(), "names_begin"); 815 DwarfAccelNamespaceSection = Ctx->getCOFFSection( 816 ".apple_namespaces", 817 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 818 COFF::IMAGE_SCN_MEM_READ, 819 SectionKind::getMetadata(), "namespac_begin"); 820 DwarfAccelTypesSection = Ctx->getCOFFSection( 821 ".apple_types", 822 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 823 COFF::IMAGE_SCN_MEM_READ, 824 SectionKind::getMetadata(), "types_begin"); 825 DwarfAccelObjCSection = Ctx->getCOFFSection( 826 ".apple_objc", 827 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 828 COFF::IMAGE_SCN_MEM_READ, 829 SectionKind::getMetadata(), "objc_begin"); 830 831 DrectveSection = Ctx->getCOFFSection( 832 ".drectve", COFF::IMAGE_SCN_LNK_INFO | COFF::IMAGE_SCN_LNK_REMOVE, 833 SectionKind::getMetadata()); 834 835 PDataSection = Ctx->getCOFFSection( 836 ".pdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, 837 SectionKind::getData()); 838 839 XDataSection = Ctx->getCOFFSection( 840 ".xdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, 841 SectionKind::getData()); 842 843 SXDataSection = Ctx->getCOFFSection(".sxdata", COFF::IMAGE_SCN_LNK_INFO, 844 SectionKind::getMetadata()); 845 846 GFIDsSection = Ctx->getCOFFSection(".gfids$y", 847 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 848 COFF::IMAGE_SCN_MEM_READ, 849 SectionKind::getMetadata()); 850 851 TLSDataSection = Ctx->getCOFFSection( 852 ".tls$", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ | 853 COFF::IMAGE_SCN_MEM_WRITE, 854 SectionKind::getData()); 855 856 StackMapSection = Ctx->getCOFFSection(".llvm_stackmaps", 857 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 858 COFF::IMAGE_SCN_MEM_READ, 859 SectionKind::getReadOnly()); 860 } 861 862 void MCObjectFileInfo::initWasmMCObjectFileInfo(const Triple &T) { 863 TextSection = Ctx->getWasmSection(".text", SectionKind::getText()); 864 DataSection = Ctx->getWasmSection(".data", SectionKind::getData()); 865 866 DwarfLineSection = 867 Ctx->getWasmSection(".debug_line", SectionKind::getMetadata()); 868 DwarfLineStrSection = 869 Ctx->getWasmSection(".debug_line_str", SectionKind::getMetadata()); 870 DwarfStrSection = 871 Ctx->getWasmSection(".debug_str", SectionKind::getMetadata()); 872 DwarfLocSection = 873 Ctx->getWasmSection(".debug_loc", SectionKind::getMetadata()); 874 DwarfAbbrevSection = 875 Ctx->getWasmSection(".debug_abbrev", SectionKind::getMetadata()); 876 DwarfARangesSection = Ctx->getWasmSection(".debug_aranges", SectionKind::getMetadata()); 877 DwarfRangesSection = 878 Ctx->getWasmSection(".debug_ranges", SectionKind::getMetadata()); 879 DwarfMacinfoSection = 880 Ctx->getWasmSection(".debug_macinfo", SectionKind::getMetadata()); 881 DwarfAddrSection = Ctx->getWasmSection(".debug_addr", SectionKind::getMetadata()); 882 DwarfCUIndexSection = Ctx->getWasmSection(".debug_cu_index", SectionKind::getMetadata()); 883 DwarfTUIndexSection = Ctx->getWasmSection(".debug_tu_index", SectionKind::getMetadata()); 884 DwarfInfoSection = 885 Ctx->getWasmSection(".debug_info", SectionKind::getMetadata()); 886 DwarfFrameSection = Ctx->getWasmSection(".debug_frame", SectionKind::getMetadata()); 887 DwarfPubNamesSection = Ctx->getWasmSection(".debug_pubnames", SectionKind::getMetadata()); 888 DwarfPubTypesSection = Ctx->getWasmSection(".debug_pubtypes", SectionKind::getMetadata()); 889 890 // TODO: Define more sections. 891 } 892 893 void MCObjectFileInfo::InitMCObjectFileInfo(const Triple &TheTriple, bool PIC, 894 MCContext &ctx, 895 bool LargeCodeModel) { 896 PositionIndependent = PIC; 897 Ctx = &ctx; 898 899 // Common. 900 CommDirectiveSupportsAlignment = true; 901 SupportsWeakOmittedEHFrame = true; 902 SupportsCompactUnwindWithoutEHFrame = false; 903 OmitDwarfIfHaveCompactUnwind = false; 904 905 PersonalityEncoding = LSDAEncoding = FDECFIEncoding = TTypeEncoding = 906 dwarf::DW_EH_PE_absptr; 907 908 CompactUnwindDwarfEHFrameOnly = 0; 909 910 EHFrameSection = nullptr; // Created on demand. 911 CompactUnwindSection = nullptr; // Used only by selected targets. 912 DwarfAccelNamesSection = nullptr; // Used only by selected targets. 913 DwarfAccelObjCSection = nullptr; // Used only by selected targets. 914 DwarfAccelNamespaceSection = nullptr; // Used only by selected targets. 915 DwarfAccelTypesSection = nullptr; // Used only by selected targets. 916 917 TT = TheTriple; 918 919 switch (TT.getObjectFormat()) { 920 case Triple::MachO: 921 Env = IsMachO; 922 initMachOMCObjectFileInfo(TT); 923 break; 924 case Triple::COFF: 925 if (!TT.isOSWindows()) 926 report_fatal_error( 927 "Cannot initialize MC for non-Windows COFF object files."); 928 929 Env = IsCOFF; 930 initCOFFMCObjectFileInfo(TT); 931 break; 932 case Triple::ELF: 933 Env = IsELF; 934 initELFMCObjectFileInfo(TT, LargeCodeModel); 935 break; 936 case Triple::Wasm: 937 Env = IsWasm; 938 initWasmMCObjectFileInfo(TT); 939 break; 940 case Triple::UnknownObjectFormat: 941 report_fatal_error("Cannot initialize MC for unknown object file format."); 942 break; 943 } 944 } 945 946 MCSection *MCObjectFileInfo::getDwarfTypesSection(uint64_t Hash) const { 947 return Ctx->getELFSection(".debug_types", ELF::SHT_PROGBITS, ELF::SHF_GROUP, 948 0, utostr(Hash)); 949 } 950 951 MCSection * 952 MCObjectFileInfo::getStackSizesSection(const MCSection &TextSec) const { 953 if (Env != IsELF) 954 return StackSizesSection; 955 956 const MCSectionELF &ElfSec = static_cast<const MCSectionELF &>(TextSec); 957 unsigned Flags = ELF::SHF_LINK_ORDER; 958 StringRef GroupName; 959 if (const MCSymbol *Group = ElfSec.getGroup()) { 960 GroupName = Group->getName(); 961 Flags |= ELF::SHF_GROUP; 962 } 963 964 const MCSymbol *Link = TextSec.getBeginSymbol(); 965 auto It = StackSizesUniquing.insert({Link, StackSizesUniquing.size()}); 966 unsigned UniqueID = It.first->second; 967 968 return Ctx->getELFSection(".stack_sizes", ELF::SHT_PROGBITS, Flags, 0, 969 GroupName, UniqueID, cast<MCSymbolELF>(Link)); 970 } 971