1 //===-- MCObjectFileInfo.cpp - Object File Information --------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "llvm/MC/MCObjectFileInfo.h" 10 #include "llvm/ADT/StringExtras.h" 11 #include "llvm/ADT/Triple.h" 12 #include "llvm/BinaryFormat/COFF.h" 13 #include "llvm/BinaryFormat/ELF.h" 14 #include "llvm/BinaryFormat/Wasm.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/MCSectionDXContainer.h" 20 #include "llvm/MC/MCSectionELF.h" 21 #include "llvm/MC/MCSectionGOFF.h" 22 #include "llvm/MC/MCSectionMachO.h" 23 #include "llvm/MC/MCSectionSPIRV.h" 24 #include "llvm/MC/MCSectionWasm.h" 25 #include "llvm/MC/MCSectionXCOFF.h" 26 #include "llvm/Support/Casting.h" 27 28 using namespace llvm; 29 30 static bool useCompactUnwind(const Triple &T) { 31 // Only on darwin. 32 if (!T.isOSDarwin()) 33 return false; 34 35 // aarch64 always has it. 36 if (T.getArch() == Triple::aarch64 || T.getArch() == Triple::aarch64_32) 37 return true; 38 39 // armv7k always has it. 40 if (T.isWatchABI()) 41 return true; 42 43 // Use it on newer version of OS X. 44 if (T.isMacOSX() && !T.isMacOSXVersionLT(10, 6)) 45 return true; 46 47 // And the iOS simulator. 48 if (T.isiOS() && T.isX86()) 49 return true; 50 51 return false; 52 } 53 54 void MCObjectFileInfo::initMachOMCObjectFileInfo(const Triple &T) { 55 // MachO 56 SupportsWeakOmittedEHFrame = false; 57 58 EHFrameSection = Ctx->getMachOSection( 59 "__TEXT", "__eh_frame", 60 MachO::S_COALESCED | MachO::S_ATTR_NO_TOC | 61 MachO::S_ATTR_STRIP_STATIC_SYMS | MachO::S_ATTR_LIVE_SUPPORT, 62 SectionKind::getReadOnly()); 63 64 if (T.isOSDarwin() && 65 (T.getArch() == Triple::aarch64 || T.getArch() == Triple::aarch64_32)) 66 SupportsCompactUnwindWithoutEHFrame = true; 67 68 switch (Ctx->emitDwarfUnwindInfo()) { 69 case EmitDwarfUnwindType::Always: 70 OmitDwarfIfHaveCompactUnwind = false; 71 break; 72 case EmitDwarfUnwindType::NoCompactUnwind: 73 OmitDwarfIfHaveCompactUnwind = true; 74 break; 75 case EmitDwarfUnwindType::Default: 76 OmitDwarfIfHaveCompactUnwind = 77 T.isWatchABI() || SupportsCompactUnwindWithoutEHFrame; 78 break; 79 } 80 81 FDECFIEncoding = dwarf::DW_EH_PE_pcrel; 82 83 // .comm doesn't support alignment before Leopard. 84 if (T.isMacOSX() && T.isMacOSXVersionLT(10, 5)) 85 CommDirectiveSupportsAlignment = false; 86 87 TextSection // .text 88 = Ctx->getMachOSection("__TEXT", "__text", 89 MachO::S_ATTR_PURE_INSTRUCTIONS, 90 SectionKind::getText()); 91 DataSection // .data 92 = Ctx->getMachOSection("__DATA", "__data", 0, SectionKind::getData()); 93 94 // BSSSection might not be expected initialized on msvc. 95 BSSSection = nullptr; 96 97 TLSDataSection // .tdata 98 = Ctx->getMachOSection("__DATA", "__thread_data", 99 MachO::S_THREAD_LOCAL_REGULAR, 100 SectionKind::getData()); 101 TLSBSSSection // .tbss 102 = Ctx->getMachOSection("__DATA", "__thread_bss", 103 MachO::S_THREAD_LOCAL_ZEROFILL, 104 SectionKind::getThreadBSS()); 105 106 // TODO: Verify datarel below. 107 TLSTLVSection // .tlv 108 = Ctx->getMachOSection("__DATA", "__thread_vars", 109 MachO::S_THREAD_LOCAL_VARIABLES, 110 SectionKind::getData()); 111 112 TLSThreadInitSection = Ctx->getMachOSection( 113 "__DATA", "__thread_init", MachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS, 114 SectionKind::getData()); 115 116 CStringSection // .cstring 117 = Ctx->getMachOSection("__TEXT", "__cstring", 118 MachO::S_CSTRING_LITERALS, 119 SectionKind::getMergeable1ByteCString()); 120 UStringSection 121 = Ctx->getMachOSection("__TEXT","__ustring", 0, 122 SectionKind::getMergeable2ByteCString()); 123 FourByteConstantSection // .literal4 124 = Ctx->getMachOSection("__TEXT", "__literal4", 125 MachO::S_4BYTE_LITERALS, 126 SectionKind::getMergeableConst4()); 127 EightByteConstantSection // .literal8 128 = Ctx->getMachOSection("__TEXT", "__literal8", 129 MachO::S_8BYTE_LITERALS, 130 SectionKind::getMergeableConst8()); 131 132 SixteenByteConstantSection // .literal16 133 = Ctx->getMachOSection("__TEXT", "__literal16", 134 MachO::S_16BYTE_LITERALS, 135 SectionKind::getMergeableConst16()); 136 137 ReadOnlySection // .const 138 = Ctx->getMachOSection("__TEXT", "__const", 0, 139 SectionKind::getReadOnly()); 140 141 // If the target is not powerpc, map the coal sections to the non-coal 142 // sections. 143 // 144 // "__TEXT/__textcoal_nt" => section "__TEXT/__text" 145 // "__TEXT/__const_coal" => section "__TEXT/__const" 146 // "__DATA/__datacoal_nt" => section "__DATA/__data" 147 Triple::ArchType ArchTy = T.getArch(); 148 149 ConstDataSection // .const_data 150 = Ctx->getMachOSection("__DATA", "__const", 0, 151 SectionKind::getReadOnlyWithRel()); 152 153 if (ArchTy == Triple::ppc || ArchTy == Triple::ppc64) { 154 TextCoalSection 155 = Ctx->getMachOSection("__TEXT", "__textcoal_nt", 156 MachO::S_COALESCED | 157 MachO::S_ATTR_PURE_INSTRUCTIONS, 158 SectionKind::getText()); 159 ConstTextCoalSection 160 = Ctx->getMachOSection("__TEXT", "__const_coal", 161 MachO::S_COALESCED, 162 SectionKind::getReadOnly()); 163 DataCoalSection = Ctx->getMachOSection( 164 "__DATA", "__datacoal_nt", MachO::S_COALESCED, SectionKind::getData()); 165 ConstDataCoalSection = DataCoalSection; 166 } else { 167 TextCoalSection = TextSection; 168 ConstTextCoalSection = ReadOnlySection; 169 DataCoalSection = DataSection; 170 ConstDataCoalSection = ConstDataSection; 171 } 172 173 DataCommonSection 174 = Ctx->getMachOSection("__DATA","__common", 175 MachO::S_ZEROFILL, 176 SectionKind::getBSS()); 177 DataBSSSection 178 = Ctx->getMachOSection("__DATA","__bss", MachO::S_ZEROFILL, 179 SectionKind::getBSS()); 180 181 182 LazySymbolPointerSection 183 = Ctx->getMachOSection("__DATA", "__la_symbol_ptr", 184 MachO::S_LAZY_SYMBOL_POINTERS, 185 SectionKind::getMetadata()); 186 NonLazySymbolPointerSection 187 = Ctx->getMachOSection("__DATA", "__nl_symbol_ptr", 188 MachO::S_NON_LAZY_SYMBOL_POINTERS, 189 SectionKind::getMetadata()); 190 191 ThreadLocalPointerSection 192 = Ctx->getMachOSection("__DATA", "__thread_ptr", 193 MachO::S_THREAD_LOCAL_VARIABLE_POINTERS, 194 SectionKind::getMetadata()); 195 196 AddrSigSection = Ctx->getMachOSection("__DATA", "__llvm_addrsig", 0, 197 SectionKind::getData()); 198 199 // Exception Handling. 200 LSDASection = Ctx->getMachOSection("__TEXT", "__gcc_except_tab", 0, 201 SectionKind::getReadOnlyWithRel()); 202 203 COFFDebugSymbolsSection = nullptr; 204 COFFDebugTypesSection = nullptr; 205 COFFGlobalTypeHashesSection = nullptr; 206 207 if (useCompactUnwind(T)) { 208 CompactUnwindSection = 209 Ctx->getMachOSection("__LD", "__compact_unwind", MachO::S_ATTR_DEBUG, 210 SectionKind::getReadOnly()); 211 212 if (T.isX86()) 213 CompactUnwindDwarfEHFrameOnly = 0x04000000; // UNWIND_X86_64_MODE_DWARF 214 else if (T.getArch() == Triple::aarch64 || T.getArch() == Triple::aarch64_32) 215 CompactUnwindDwarfEHFrameOnly = 0x03000000; // UNWIND_ARM64_MODE_DWARF 216 else if (T.getArch() == Triple::arm || T.getArch() == Triple::thumb) 217 CompactUnwindDwarfEHFrameOnly = 0x04000000; // UNWIND_ARM_MODE_DWARF 218 } 219 220 // Debug Information. 221 DwarfDebugNamesSection = 222 Ctx->getMachOSection("__DWARF", "__debug_names", MachO::S_ATTR_DEBUG, 223 SectionKind::getMetadata(), "debug_names_begin"); 224 DwarfAccelNamesSection = 225 Ctx->getMachOSection("__DWARF", "__apple_names", MachO::S_ATTR_DEBUG, 226 SectionKind::getMetadata(), "names_begin"); 227 DwarfAccelObjCSection = 228 Ctx->getMachOSection("__DWARF", "__apple_objc", MachO::S_ATTR_DEBUG, 229 SectionKind::getMetadata(), "objc_begin"); 230 // 16 character section limit... 231 DwarfAccelNamespaceSection = 232 Ctx->getMachOSection("__DWARF", "__apple_namespac", MachO::S_ATTR_DEBUG, 233 SectionKind::getMetadata(), "namespac_begin"); 234 DwarfAccelTypesSection = 235 Ctx->getMachOSection("__DWARF", "__apple_types", MachO::S_ATTR_DEBUG, 236 SectionKind::getMetadata(), "types_begin"); 237 238 DwarfSwiftASTSection = 239 Ctx->getMachOSection("__DWARF", "__swift_ast", MachO::S_ATTR_DEBUG, 240 SectionKind::getMetadata()); 241 242 DwarfAbbrevSection = 243 Ctx->getMachOSection("__DWARF", "__debug_abbrev", MachO::S_ATTR_DEBUG, 244 SectionKind::getMetadata(), "section_abbrev"); 245 DwarfInfoSection = 246 Ctx->getMachOSection("__DWARF", "__debug_info", MachO::S_ATTR_DEBUG, 247 SectionKind::getMetadata(), "section_info"); 248 DwarfLineSection = 249 Ctx->getMachOSection("__DWARF", "__debug_line", MachO::S_ATTR_DEBUG, 250 SectionKind::getMetadata(), "section_line"); 251 DwarfLineStrSection = 252 Ctx->getMachOSection("__DWARF", "__debug_line_str", MachO::S_ATTR_DEBUG, 253 SectionKind::getMetadata(), "section_line_str"); 254 DwarfFrameSection = 255 Ctx->getMachOSection("__DWARF", "__debug_frame", MachO::S_ATTR_DEBUG, 256 SectionKind::getMetadata()); 257 DwarfPubNamesSection = 258 Ctx->getMachOSection("__DWARF", "__debug_pubnames", MachO::S_ATTR_DEBUG, 259 SectionKind::getMetadata()); 260 DwarfPubTypesSection = 261 Ctx->getMachOSection("__DWARF", "__debug_pubtypes", MachO::S_ATTR_DEBUG, 262 SectionKind::getMetadata()); 263 DwarfGnuPubNamesSection = 264 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubn", MachO::S_ATTR_DEBUG, 265 SectionKind::getMetadata()); 266 DwarfGnuPubTypesSection = 267 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubt", MachO::S_ATTR_DEBUG, 268 SectionKind::getMetadata()); 269 DwarfStrSection = 270 Ctx->getMachOSection("__DWARF", "__debug_str", MachO::S_ATTR_DEBUG, 271 SectionKind::getMetadata(), "info_string"); 272 DwarfStrOffSection = 273 Ctx->getMachOSection("__DWARF", "__debug_str_offs", MachO::S_ATTR_DEBUG, 274 SectionKind::getMetadata(), "section_str_off"); 275 DwarfAddrSection = 276 Ctx->getMachOSection("__DWARF", "__debug_addr", MachO::S_ATTR_DEBUG, 277 SectionKind::getMetadata(), "section_info"); 278 DwarfLocSection = 279 Ctx->getMachOSection("__DWARF", "__debug_loc", MachO::S_ATTR_DEBUG, 280 SectionKind::getMetadata(), "section_debug_loc"); 281 DwarfLoclistsSection = 282 Ctx->getMachOSection("__DWARF", "__debug_loclists", MachO::S_ATTR_DEBUG, 283 SectionKind::getMetadata(), "section_debug_loc"); 284 285 DwarfARangesSection = 286 Ctx->getMachOSection("__DWARF", "__debug_aranges", MachO::S_ATTR_DEBUG, 287 SectionKind::getMetadata()); 288 DwarfRangesSection = 289 Ctx->getMachOSection("__DWARF", "__debug_ranges", MachO::S_ATTR_DEBUG, 290 SectionKind::getMetadata(), "debug_range"); 291 DwarfRnglistsSection = 292 Ctx->getMachOSection("__DWARF", "__debug_rnglists", MachO::S_ATTR_DEBUG, 293 SectionKind::getMetadata(), "debug_range"); 294 DwarfMacinfoSection = 295 Ctx->getMachOSection("__DWARF", "__debug_macinfo", MachO::S_ATTR_DEBUG, 296 SectionKind::getMetadata(), "debug_macinfo"); 297 DwarfMacroSection = 298 Ctx->getMachOSection("__DWARF", "__debug_macro", MachO::S_ATTR_DEBUG, 299 SectionKind::getMetadata(), "debug_macro"); 300 DwarfDebugInlineSection = 301 Ctx->getMachOSection("__DWARF", "__debug_inlined", MachO::S_ATTR_DEBUG, 302 SectionKind::getMetadata()); 303 DwarfCUIndexSection = 304 Ctx->getMachOSection("__DWARF", "__debug_cu_index", MachO::S_ATTR_DEBUG, 305 SectionKind::getMetadata()); 306 DwarfTUIndexSection = 307 Ctx->getMachOSection("__DWARF", "__debug_tu_index", MachO::S_ATTR_DEBUG, 308 SectionKind::getMetadata()); 309 StackMapSection = Ctx->getMachOSection("__LLVM_STACKMAPS", "__llvm_stackmaps", 310 0, SectionKind::getMetadata()); 311 312 FaultMapSection = Ctx->getMachOSection("__LLVM_FAULTMAPS", "__llvm_faultmaps", 313 0, SectionKind::getMetadata()); 314 315 RemarksSection = Ctx->getMachOSection( 316 "__LLVM", "__remarks", MachO::S_ATTR_DEBUG, SectionKind::getMetadata()); 317 318 // The architecture of dsymutil makes it very difficult to copy the Swift 319 // reflection metadata sections into the __TEXT segment, so dsymutil creates 320 // these sections in the __DWARF segment instead. 321 if (!Ctx->getSwift5ReflectionSegmentName().empty()) { 322 #define HANDLE_SWIFT_SECTION(KIND, MACHO, ELF, COFF) \ 323 Swift5ReflectionSections \ 324 [llvm::binaryformat::Swift5ReflectionSectionKind::KIND] = \ 325 Ctx->getMachOSection(Ctx->getSwift5ReflectionSegmentName().data(), \ 326 MACHO, 0, SectionKind::getMetadata()); 327 #include "llvm/BinaryFormat/Swift.def" 328 } 329 330 TLSExtraDataSection = TLSTLVSection; 331 } 332 333 void MCObjectFileInfo::initELFMCObjectFileInfo(const Triple &T, bool Large) { 334 switch (T.getArch()) { 335 case Triple::mips: 336 case Triple::mipsel: 337 case Triple::mips64: 338 case Triple::mips64el: 339 // We cannot use DW_EH_PE_sdata8 for the large PositionIndependent case 340 // since there is no R_MIPS_PC64 relocation (only a 32-bit version). 341 if (PositionIndependent && !Large) 342 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 343 else 344 FDECFIEncoding = Ctx->getAsmInfo()->getCodePointerSize() == 4 345 ? dwarf::DW_EH_PE_sdata4 346 : dwarf::DW_EH_PE_sdata8; 347 break; 348 case Triple::ppc64: 349 case Triple::ppc64le: 350 case Triple::aarch64: 351 case Triple::aarch64_be: 352 case Triple::x86_64: 353 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | 354 (Large ? dwarf::DW_EH_PE_sdata8 : dwarf::DW_EH_PE_sdata4); 355 break; 356 case Triple::bpfel: 357 case Triple::bpfeb: 358 FDECFIEncoding = dwarf::DW_EH_PE_sdata8; 359 break; 360 case Triple::hexagon: 361 FDECFIEncoding = 362 PositionIndependent ? dwarf::DW_EH_PE_pcrel : dwarf::DW_EH_PE_absptr; 363 break; 364 default: 365 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 366 break; 367 } 368 369 unsigned EHSectionType = T.getArch() == Triple::x86_64 370 ? ELF::SHT_X86_64_UNWIND 371 : ELF::SHT_PROGBITS; 372 373 // Solaris requires different flags for .eh_frame to seemingly every other 374 // platform. 375 unsigned EHSectionFlags = ELF::SHF_ALLOC; 376 if (T.isOSSolaris() && T.getArch() != Triple::x86_64) 377 EHSectionFlags |= ELF::SHF_WRITE; 378 379 // ELF 380 BSSSection = Ctx->getELFSection(".bss", ELF::SHT_NOBITS, 381 ELF::SHF_WRITE | ELF::SHF_ALLOC); 382 383 TextSection = Ctx->getELFSection(".text", ELF::SHT_PROGBITS, 384 ELF::SHF_EXECINSTR | ELF::SHF_ALLOC); 385 386 DataSection = Ctx->getELFSection(".data", ELF::SHT_PROGBITS, 387 ELF::SHF_WRITE | ELF::SHF_ALLOC); 388 389 ReadOnlySection = 390 Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); 391 392 TLSDataSection = 393 Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS, 394 ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE); 395 396 TLSBSSSection = Ctx->getELFSection( 397 ".tbss", ELF::SHT_NOBITS, ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE); 398 399 DataRelROSection = Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS, 400 ELF::SHF_ALLOC | ELF::SHF_WRITE); 401 402 MergeableConst4Section = 403 Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS, 404 ELF::SHF_ALLOC | ELF::SHF_MERGE, 4); 405 406 MergeableConst8Section = 407 Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS, 408 ELF::SHF_ALLOC | ELF::SHF_MERGE, 8); 409 410 MergeableConst16Section = 411 Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS, 412 ELF::SHF_ALLOC | ELF::SHF_MERGE, 16); 413 414 MergeableConst32Section = 415 Ctx->getELFSection(".rodata.cst32", ELF::SHT_PROGBITS, 416 ELF::SHF_ALLOC | ELF::SHF_MERGE, 32); 417 418 // Exception Handling Sections. 419 420 // FIXME: We're emitting LSDA info into a readonly section on ELF, even though 421 // it contains relocatable pointers. In PIC mode, this is probably a big 422 // runtime hit for C++ apps. Either the contents of the LSDA need to be 423 // adjusted or this should be a data section. 424 LSDASection = Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS, 425 ELF::SHF_ALLOC); 426 427 COFFDebugSymbolsSection = nullptr; 428 COFFDebugTypesSection = nullptr; 429 430 unsigned DebugSecType = ELF::SHT_PROGBITS; 431 432 // MIPS .debug_* sections should have SHT_MIPS_DWARF section type 433 // to distinguish among sections contain DWARF and ECOFF debug formats. 434 // Sections with ECOFF debug format are obsoleted and marked by SHT_PROGBITS. 435 if (T.isMIPS()) 436 DebugSecType = ELF::SHT_MIPS_DWARF; 437 438 // Debug Info Sections. 439 DwarfAbbrevSection = 440 Ctx->getELFSection(".debug_abbrev", DebugSecType, 0); 441 DwarfInfoSection = Ctx->getELFSection(".debug_info", DebugSecType, 0); 442 DwarfLineSection = Ctx->getELFSection(".debug_line", DebugSecType, 0); 443 DwarfLineStrSection = 444 Ctx->getELFSection(".debug_line_str", DebugSecType, 445 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1); 446 DwarfFrameSection = Ctx->getELFSection(".debug_frame", DebugSecType, 0); 447 DwarfPubNamesSection = 448 Ctx->getELFSection(".debug_pubnames", DebugSecType, 0); 449 DwarfPubTypesSection = 450 Ctx->getELFSection(".debug_pubtypes", DebugSecType, 0); 451 DwarfGnuPubNamesSection = 452 Ctx->getELFSection(".debug_gnu_pubnames", DebugSecType, 0); 453 DwarfGnuPubTypesSection = 454 Ctx->getELFSection(".debug_gnu_pubtypes", DebugSecType, 0); 455 DwarfStrSection = 456 Ctx->getELFSection(".debug_str", DebugSecType, 457 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1); 458 DwarfLocSection = Ctx->getELFSection(".debug_loc", DebugSecType, 0); 459 DwarfARangesSection = 460 Ctx->getELFSection(".debug_aranges", DebugSecType, 0); 461 DwarfRangesSection = 462 Ctx->getELFSection(".debug_ranges", DebugSecType, 0); 463 DwarfMacinfoSection = 464 Ctx->getELFSection(".debug_macinfo", DebugSecType, 0); 465 DwarfMacroSection = Ctx->getELFSection(".debug_macro", DebugSecType, 0); 466 467 // DWARF5 Experimental Debug Info 468 469 // Accelerator Tables 470 DwarfDebugNamesSection = 471 Ctx->getELFSection(".debug_names", ELF::SHT_PROGBITS, 0); 472 DwarfAccelNamesSection = 473 Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0); 474 DwarfAccelObjCSection = 475 Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0); 476 DwarfAccelNamespaceSection = 477 Ctx->getELFSection(".apple_namespaces", ELF::SHT_PROGBITS, 0); 478 DwarfAccelTypesSection = 479 Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0); 480 481 // String Offset and Address Sections 482 DwarfStrOffSection = 483 Ctx->getELFSection(".debug_str_offsets", DebugSecType, 0); 484 DwarfAddrSection = Ctx->getELFSection(".debug_addr", DebugSecType, 0); 485 DwarfRnglistsSection = Ctx->getELFSection(".debug_rnglists", DebugSecType, 0); 486 DwarfLoclistsSection = Ctx->getELFSection(".debug_loclists", DebugSecType, 0); 487 488 // Fission Sections 489 DwarfInfoDWOSection = 490 Ctx->getELFSection(".debug_info.dwo", DebugSecType, ELF::SHF_EXCLUDE); 491 DwarfTypesDWOSection = 492 Ctx->getELFSection(".debug_types.dwo", DebugSecType, ELF::SHF_EXCLUDE); 493 DwarfAbbrevDWOSection = 494 Ctx->getELFSection(".debug_abbrev.dwo", DebugSecType, ELF::SHF_EXCLUDE); 495 DwarfStrDWOSection = Ctx->getELFSection( 496 ".debug_str.dwo", DebugSecType, 497 ELF::SHF_MERGE | ELF::SHF_STRINGS | ELF::SHF_EXCLUDE, 1); 498 DwarfLineDWOSection = 499 Ctx->getELFSection(".debug_line.dwo", DebugSecType, ELF::SHF_EXCLUDE); 500 DwarfLocDWOSection = 501 Ctx->getELFSection(".debug_loc.dwo", DebugSecType, ELF::SHF_EXCLUDE); 502 DwarfStrOffDWOSection = Ctx->getELFSection(".debug_str_offsets.dwo", 503 DebugSecType, ELF::SHF_EXCLUDE); 504 DwarfRnglistsDWOSection = 505 Ctx->getELFSection(".debug_rnglists.dwo", DebugSecType, ELF::SHF_EXCLUDE); 506 DwarfMacinfoDWOSection = 507 Ctx->getELFSection(".debug_macinfo.dwo", DebugSecType, ELF::SHF_EXCLUDE); 508 DwarfMacroDWOSection = 509 Ctx->getELFSection(".debug_macro.dwo", DebugSecType, ELF::SHF_EXCLUDE); 510 511 DwarfLoclistsDWOSection = 512 Ctx->getELFSection(".debug_loclists.dwo", DebugSecType, ELF::SHF_EXCLUDE); 513 514 // DWP Sections 515 DwarfCUIndexSection = 516 Ctx->getELFSection(".debug_cu_index", DebugSecType, 0); 517 DwarfTUIndexSection = 518 Ctx->getELFSection(".debug_tu_index", DebugSecType, 0); 519 520 StackMapSection = 521 Ctx->getELFSection(".llvm_stackmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); 522 523 FaultMapSection = 524 Ctx->getELFSection(".llvm_faultmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); 525 526 EHFrameSection = 527 Ctx->getELFSection(".eh_frame", EHSectionType, EHSectionFlags); 528 529 StackSizesSection = Ctx->getELFSection(".stack_sizes", ELF::SHT_PROGBITS, 0); 530 531 PseudoProbeSection = Ctx->getELFSection(".pseudo_probe", DebugSecType, 0); 532 PseudoProbeDescSection = 533 Ctx->getELFSection(".pseudo_probe_desc", DebugSecType, 0); 534 } 535 536 void MCObjectFileInfo::initGOFFMCObjectFileInfo(const Triple &T) { 537 TextSection = 538 Ctx->getGOFFSection(".text", SectionKind::getText(), nullptr, nullptr); 539 BSSSection = 540 Ctx->getGOFFSection(".bss", SectionKind::getBSS(), nullptr, nullptr); 541 PPA1Section = 542 Ctx->getGOFFSection(".ppa1", SectionKind::getMetadata(), TextSection, 543 MCConstantExpr::create(GOFF::SK_PPA1, *Ctx)); 544 } 545 546 void MCObjectFileInfo::initCOFFMCObjectFileInfo(const Triple &T) { 547 EHFrameSection = 548 Ctx->getCOFFSection(".eh_frame", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 549 COFF::IMAGE_SCN_MEM_READ, 550 SectionKind::getData()); 551 552 // Set the `IMAGE_SCN_MEM_16BIT` flag when compiling for thumb mode. This is 553 // used to indicate to the linker that the text segment contains thumb instructions 554 // and to set the ISA selection bit for calls accordingly. 555 const bool IsThumb = T.getArch() == Triple::thumb; 556 557 CommDirectiveSupportsAlignment = true; 558 559 // COFF 560 BSSSection = Ctx->getCOFFSection( 561 ".bss", COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA | 562 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE, 563 SectionKind::getBSS()); 564 TextSection = Ctx->getCOFFSection( 565 ".text", 566 (IsThumb ? COFF::IMAGE_SCN_MEM_16BIT : (COFF::SectionCharacteristics)0) | 567 COFF::IMAGE_SCN_CNT_CODE | COFF::IMAGE_SCN_MEM_EXECUTE | 568 COFF::IMAGE_SCN_MEM_READ, 569 SectionKind::getText()); 570 DataSection = Ctx->getCOFFSection( 571 ".data", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ | 572 COFF::IMAGE_SCN_MEM_WRITE, 573 SectionKind::getData()); 574 ReadOnlySection = Ctx->getCOFFSection( 575 ".rdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, 576 SectionKind::getReadOnly()); 577 578 if (T.getArch() == Triple::x86_64 || T.getArch() == Triple::aarch64 || 579 T.getArch() == Triple::arm || T.getArch() == Triple::thumb) { 580 // On Windows with SEH, the LSDA is emitted into the .xdata section 581 LSDASection = nullptr; 582 } else { 583 LSDASection = Ctx->getCOFFSection(".gcc_except_table", 584 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 585 COFF::IMAGE_SCN_MEM_READ, 586 SectionKind::getReadOnly()); 587 } 588 589 // Debug info. 590 COFFDebugSymbolsSection = 591 Ctx->getCOFFSection(".debug$S", (COFF::IMAGE_SCN_MEM_DISCARDABLE | 592 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 593 COFF::IMAGE_SCN_MEM_READ), 594 SectionKind::getMetadata()); 595 COFFDebugTypesSection = 596 Ctx->getCOFFSection(".debug$T", (COFF::IMAGE_SCN_MEM_DISCARDABLE | 597 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 598 COFF::IMAGE_SCN_MEM_READ), 599 SectionKind::getMetadata()); 600 COFFGlobalTypeHashesSection = Ctx->getCOFFSection( 601 ".debug$H", 602 (COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 603 COFF::IMAGE_SCN_MEM_READ), 604 SectionKind::getMetadata()); 605 606 DwarfAbbrevSection = Ctx->getCOFFSection( 607 ".debug_abbrev", 608 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 609 COFF::IMAGE_SCN_MEM_READ, 610 SectionKind::getMetadata(), "section_abbrev"); 611 DwarfInfoSection = Ctx->getCOFFSection( 612 ".debug_info", 613 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 614 COFF::IMAGE_SCN_MEM_READ, 615 SectionKind::getMetadata(), "section_info"); 616 DwarfLineSection = Ctx->getCOFFSection( 617 ".debug_line", 618 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 619 COFF::IMAGE_SCN_MEM_READ, 620 SectionKind::getMetadata(), "section_line"); 621 DwarfLineStrSection = Ctx->getCOFFSection( 622 ".debug_line_str", 623 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 624 COFF::IMAGE_SCN_MEM_READ, 625 SectionKind::getMetadata(), "section_line_str"); 626 DwarfFrameSection = Ctx->getCOFFSection( 627 ".debug_frame", 628 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 629 COFF::IMAGE_SCN_MEM_READ, 630 SectionKind::getMetadata()); 631 DwarfPubNamesSection = Ctx->getCOFFSection( 632 ".debug_pubnames", 633 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 634 COFF::IMAGE_SCN_MEM_READ, 635 SectionKind::getMetadata()); 636 DwarfPubTypesSection = Ctx->getCOFFSection( 637 ".debug_pubtypes", 638 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 639 COFF::IMAGE_SCN_MEM_READ, 640 SectionKind::getMetadata()); 641 DwarfGnuPubNamesSection = Ctx->getCOFFSection( 642 ".debug_gnu_pubnames", 643 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 644 COFF::IMAGE_SCN_MEM_READ, 645 SectionKind::getMetadata()); 646 DwarfGnuPubTypesSection = Ctx->getCOFFSection( 647 ".debug_gnu_pubtypes", 648 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 649 COFF::IMAGE_SCN_MEM_READ, 650 SectionKind::getMetadata()); 651 DwarfStrSection = Ctx->getCOFFSection( 652 ".debug_str", 653 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 654 COFF::IMAGE_SCN_MEM_READ, 655 SectionKind::getMetadata(), "info_string"); 656 DwarfStrOffSection = Ctx->getCOFFSection( 657 ".debug_str_offsets", 658 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 659 COFF::IMAGE_SCN_MEM_READ, 660 SectionKind::getMetadata(), "section_str_off"); 661 DwarfLocSection = Ctx->getCOFFSection( 662 ".debug_loc", 663 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 664 COFF::IMAGE_SCN_MEM_READ, 665 SectionKind::getMetadata(), "section_debug_loc"); 666 DwarfLoclistsSection = Ctx->getCOFFSection( 667 ".debug_loclists", 668 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 669 COFF::IMAGE_SCN_MEM_READ, 670 SectionKind::getMetadata(), "section_debug_loclists"); 671 DwarfARangesSection = Ctx->getCOFFSection( 672 ".debug_aranges", 673 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 674 COFF::IMAGE_SCN_MEM_READ, 675 SectionKind::getMetadata()); 676 DwarfRangesSection = Ctx->getCOFFSection( 677 ".debug_ranges", 678 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 679 COFF::IMAGE_SCN_MEM_READ, 680 SectionKind::getMetadata(), "debug_range"); 681 DwarfRnglistsSection = Ctx->getCOFFSection( 682 ".debug_rnglists", 683 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 684 COFF::IMAGE_SCN_MEM_READ, 685 SectionKind::getMetadata(), "debug_rnglists"); 686 DwarfMacinfoSection = Ctx->getCOFFSection( 687 ".debug_macinfo", 688 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 689 COFF::IMAGE_SCN_MEM_READ, 690 SectionKind::getMetadata(), "debug_macinfo"); 691 DwarfMacroSection = Ctx->getCOFFSection( 692 ".debug_macro", 693 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 694 COFF::IMAGE_SCN_MEM_READ, 695 SectionKind::getMetadata(), "debug_macro"); 696 DwarfMacinfoDWOSection = Ctx->getCOFFSection( 697 ".debug_macinfo.dwo", 698 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 699 COFF::IMAGE_SCN_MEM_READ, 700 SectionKind::getMetadata(), "debug_macinfo.dwo"); 701 DwarfMacroDWOSection = Ctx->getCOFFSection( 702 ".debug_macro.dwo", 703 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 704 COFF::IMAGE_SCN_MEM_READ, 705 SectionKind::getMetadata(), "debug_macro.dwo"); 706 DwarfInfoDWOSection = Ctx->getCOFFSection( 707 ".debug_info.dwo", 708 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 709 COFF::IMAGE_SCN_MEM_READ, 710 SectionKind::getMetadata(), "section_info_dwo"); 711 DwarfTypesDWOSection = Ctx->getCOFFSection( 712 ".debug_types.dwo", 713 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 714 COFF::IMAGE_SCN_MEM_READ, 715 SectionKind::getMetadata(), "section_types_dwo"); 716 DwarfAbbrevDWOSection = Ctx->getCOFFSection( 717 ".debug_abbrev.dwo", 718 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 719 COFF::IMAGE_SCN_MEM_READ, 720 SectionKind::getMetadata(), "section_abbrev_dwo"); 721 DwarfStrDWOSection = Ctx->getCOFFSection( 722 ".debug_str.dwo", 723 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 724 COFF::IMAGE_SCN_MEM_READ, 725 SectionKind::getMetadata(), "skel_string"); 726 DwarfLineDWOSection = Ctx->getCOFFSection( 727 ".debug_line.dwo", 728 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 729 COFF::IMAGE_SCN_MEM_READ, 730 SectionKind::getMetadata()); 731 DwarfLocDWOSection = Ctx->getCOFFSection( 732 ".debug_loc.dwo", 733 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 734 COFF::IMAGE_SCN_MEM_READ, 735 SectionKind::getMetadata(), "skel_loc"); 736 DwarfStrOffDWOSection = Ctx->getCOFFSection( 737 ".debug_str_offsets.dwo", 738 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 739 COFF::IMAGE_SCN_MEM_READ, 740 SectionKind::getMetadata(), "section_str_off_dwo"); 741 DwarfAddrSection = Ctx->getCOFFSection( 742 ".debug_addr", 743 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 744 COFF::IMAGE_SCN_MEM_READ, 745 SectionKind::getMetadata(), "addr_sec"); 746 DwarfCUIndexSection = Ctx->getCOFFSection( 747 ".debug_cu_index", 748 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 749 COFF::IMAGE_SCN_MEM_READ, 750 SectionKind::getMetadata()); 751 DwarfTUIndexSection = Ctx->getCOFFSection( 752 ".debug_tu_index", 753 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 754 COFF::IMAGE_SCN_MEM_READ, 755 SectionKind::getMetadata()); 756 DwarfDebugNamesSection = Ctx->getCOFFSection( 757 ".debug_names", 758 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 759 COFF::IMAGE_SCN_MEM_READ, 760 SectionKind::getMetadata(), "debug_names_begin"); 761 DwarfAccelNamesSection = Ctx->getCOFFSection( 762 ".apple_names", 763 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 764 COFF::IMAGE_SCN_MEM_READ, 765 SectionKind::getMetadata(), "names_begin"); 766 DwarfAccelNamespaceSection = Ctx->getCOFFSection( 767 ".apple_namespaces", 768 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 769 COFF::IMAGE_SCN_MEM_READ, 770 SectionKind::getMetadata(), "namespac_begin"); 771 DwarfAccelTypesSection = Ctx->getCOFFSection( 772 ".apple_types", 773 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 774 COFF::IMAGE_SCN_MEM_READ, 775 SectionKind::getMetadata(), "types_begin"); 776 DwarfAccelObjCSection = Ctx->getCOFFSection( 777 ".apple_objc", 778 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 779 COFF::IMAGE_SCN_MEM_READ, 780 SectionKind::getMetadata(), "objc_begin"); 781 782 DrectveSection = Ctx->getCOFFSection( 783 ".drectve", COFF::IMAGE_SCN_LNK_INFO | COFF::IMAGE_SCN_LNK_REMOVE, 784 SectionKind::getMetadata()); 785 786 PDataSection = Ctx->getCOFFSection( 787 ".pdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, 788 SectionKind::getData()); 789 790 XDataSection = Ctx->getCOFFSection( 791 ".xdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, 792 SectionKind::getData()); 793 794 SXDataSection = Ctx->getCOFFSection(".sxdata", COFF::IMAGE_SCN_LNK_INFO, 795 SectionKind::getMetadata()); 796 797 GEHContSection = Ctx->getCOFFSection(".gehcont$y", 798 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 799 COFF::IMAGE_SCN_MEM_READ, 800 SectionKind::getMetadata()); 801 802 GFIDsSection = Ctx->getCOFFSection(".gfids$y", 803 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 804 COFF::IMAGE_SCN_MEM_READ, 805 SectionKind::getMetadata()); 806 807 GIATsSection = Ctx->getCOFFSection(".giats$y", 808 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 809 COFF::IMAGE_SCN_MEM_READ, 810 SectionKind::getMetadata()); 811 812 GLJMPSection = Ctx->getCOFFSection(".gljmp$y", 813 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 814 COFF::IMAGE_SCN_MEM_READ, 815 SectionKind::getMetadata()); 816 817 TLSDataSection = Ctx->getCOFFSection( 818 ".tls$", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ | 819 COFF::IMAGE_SCN_MEM_WRITE, 820 SectionKind::getData()); 821 822 StackMapSection = Ctx->getCOFFSection(".llvm_stackmaps", 823 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 824 COFF::IMAGE_SCN_MEM_READ, 825 SectionKind::getReadOnly()); 826 } 827 828 void MCObjectFileInfo::initSPIRVMCObjectFileInfo(const Triple &T) { 829 // Put everything in a single binary section. 830 TextSection = Ctx->getSPIRVSection(); 831 } 832 833 void MCObjectFileInfo::initWasmMCObjectFileInfo(const Triple &T) { 834 TextSection = Ctx->getWasmSection(".text", SectionKind::getText()); 835 DataSection = Ctx->getWasmSection(".data", SectionKind::getData()); 836 837 DwarfLineSection = 838 Ctx->getWasmSection(".debug_line", SectionKind::getMetadata()); 839 DwarfLineStrSection = 840 Ctx->getWasmSection(".debug_line_str", SectionKind::getMetadata(), 841 wasm::WASM_SEG_FLAG_STRINGS); 842 DwarfStrSection = Ctx->getWasmSection( 843 ".debug_str", SectionKind::getMetadata(), wasm::WASM_SEG_FLAG_STRINGS); 844 DwarfLocSection = 845 Ctx->getWasmSection(".debug_loc", SectionKind::getMetadata()); 846 DwarfAbbrevSection = 847 Ctx->getWasmSection(".debug_abbrev", SectionKind::getMetadata()); 848 DwarfARangesSection = Ctx->getWasmSection(".debug_aranges", SectionKind::getMetadata()); 849 DwarfRangesSection = 850 Ctx->getWasmSection(".debug_ranges", SectionKind::getMetadata()); 851 DwarfMacinfoSection = 852 Ctx->getWasmSection(".debug_macinfo", SectionKind::getMetadata()); 853 DwarfMacroSection = 854 Ctx->getWasmSection(".debug_macro", SectionKind::getMetadata()); 855 DwarfCUIndexSection = Ctx->getWasmSection(".debug_cu_index", SectionKind::getMetadata()); 856 DwarfTUIndexSection = Ctx->getWasmSection(".debug_tu_index", SectionKind::getMetadata()); 857 DwarfInfoSection = 858 Ctx->getWasmSection(".debug_info", SectionKind::getMetadata()); 859 DwarfFrameSection = Ctx->getWasmSection(".debug_frame", SectionKind::getMetadata()); 860 DwarfPubNamesSection = Ctx->getWasmSection(".debug_pubnames", SectionKind::getMetadata()); 861 DwarfPubTypesSection = Ctx->getWasmSection(".debug_pubtypes", SectionKind::getMetadata()); 862 DwarfGnuPubNamesSection = 863 Ctx->getWasmSection(".debug_gnu_pubnames", SectionKind::getMetadata()); 864 DwarfGnuPubTypesSection = 865 Ctx->getWasmSection(".debug_gnu_pubtypes", SectionKind::getMetadata()); 866 867 DwarfDebugNamesSection = 868 Ctx->getWasmSection(".debug_names", SectionKind::getMetadata()); 869 DwarfStrOffSection = 870 Ctx->getWasmSection(".debug_str_offsets", SectionKind::getMetadata()); 871 DwarfAddrSection = 872 Ctx->getWasmSection(".debug_addr", SectionKind::getMetadata()); 873 DwarfRnglistsSection = 874 Ctx->getWasmSection(".debug_rnglists", SectionKind::getMetadata()); 875 DwarfLoclistsSection = 876 Ctx->getWasmSection(".debug_loclists", SectionKind::getMetadata()); 877 878 // Fission Sections 879 DwarfInfoDWOSection = 880 Ctx->getWasmSection(".debug_info.dwo", SectionKind::getMetadata()); 881 DwarfTypesDWOSection = 882 Ctx->getWasmSection(".debug_types.dwo", SectionKind::getMetadata()); 883 DwarfAbbrevDWOSection = 884 Ctx->getWasmSection(".debug_abbrev.dwo", SectionKind::getMetadata()); 885 DwarfStrDWOSection = 886 Ctx->getWasmSection(".debug_str.dwo", SectionKind::getMetadata(), 887 wasm::WASM_SEG_FLAG_STRINGS); 888 DwarfLineDWOSection = 889 Ctx->getWasmSection(".debug_line.dwo", SectionKind::getMetadata()); 890 DwarfLocDWOSection = 891 Ctx->getWasmSection(".debug_loc.dwo", SectionKind::getMetadata()); 892 DwarfStrOffDWOSection = 893 Ctx->getWasmSection(".debug_str_offsets.dwo", SectionKind::getMetadata()); 894 DwarfRnglistsDWOSection = 895 Ctx->getWasmSection(".debug_rnglists.dwo", SectionKind::getMetadata()); 896 DwarfMacinfoDWOSection = 897 Ctx->getWasmSection(".debug_macinfo.dwo", SectionKind::getMetadata()); 898 DwarfMacroDWOSection = 899 Ctx->getWasmSection(".debug_macro.dwo", SectionKind::getMetadata()); 900 901 DwarfLoclistsDWOSection = 902 Ctx->getWasmSection(".debug_loclists.dwo", SectionKind::getMetadata()); 903 904 // DWP Sections 905 DwarfCUIndexSection = 906 Ctx->getWasmSection(".debug_cu_index", SectionKind::getMetadata()); 907 DwarfTUIndexSection = 908 Ctx->getWasmSection(".debug_tu_index", SectionKind::getMetadata()); 909 910 // Wasm use data section for LSDA. 911 // TODO Consider putting each function's exception table in a separate 912 // section, as in -function-sections, to facilitate lld's --gc-section. 913 LSDASection = Ctx->getWasmSection(".rodata.gcc_except_table", 914 SectionKind::getReadOnlyWithRel()); 915 916 // TODO: Define more sections. 917 } 918 919 void MCObjectFileInfo::initXCOFFMCObjectFileInfo(const Triple &T) { 920 // The default csect for program code. Functions without a specified section 921 // get placed into this csect. The choice of csect name is not a property of 922 // the ABI or object file format. For example, the XL compiler uses an unnamed 923 // csect for program code. 924 TextSection = Ctx->getXCOFFSection( 925 ".text", SectionKind::getText(), 926 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_PR, XCOFF::XTY_SD), 927 /* MultiSymbolsAllowed*/ true); 928 929 DataSection = Ctx->getXCOFFSection( 930 ".data", SectionKind::getData(), 931 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_RW, XCOFF::XTY_SD), 932 /* MultiSymbolsAllowed*/ true); 933 934 ReadOnlySection = Ctx->getXCOFFSection( 935 ".rodata", SectionKind::getReadOnly(), 936 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_RO, XCOFF::XTY_SD), 937 /* MultiSymbolsAllowed*/ true); 938 ReadOnlySection->setAlignment(Align(4)); 939 940 ReadOnly8Section = Ctx->getXCOFFSection( 941 ".rodata.8", SectionKind::getReadOnly(), 942 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_RO, XCOFF::XTY_SD), 943 /* MultiSymbolsAllowed*/ true); 944 ReadOnly8Section->setAlignment(Align(8)); 945 946 ReadOnly16Section = Ctx->getXCOFFSection( 947 ".rodata.16", SectionKind::getReadOnly(), 948 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_RO, XCOFF::XTY_SD), 949 /* MultiSymbolsAllowed*/ true); 950 ReadOnly16Section->setAlignment(Align(16)); 951 952 TLSDataSection = Ctx->getXCOFFSection( 953 ".tdata", SectionKind::getThreadData(), 954 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_TL, XCOFF::XTY_SD), 955 /* MultiSymbolsAllowed*/ true); 956 957 TOCBaseSection = Ctx->getXCOFFSection( 958 "TOC", SectionKind::getData(), 959 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_TC0, 960 XCOFF::XTY_SD)); 961 962 // The TOC-base always has 0 size, but 4 byte alignment. 963 TOCBaseSection->setAlignment(Align(4)); 964 965 LSDASection = Ctx->getXCOFFSection( 966 ".gcc_except_table", SectionKind::getReadOnly(), 967 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_RO, 968 XCOFF::XTY_SD)); 969 970 CompactUnwindSection = Ctx->getXCOFFSection( 971 ".eh_info_table", SectionKind::getData(), 972 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_RW, 973 XCOFF::XTY_SD)); 974 975 // DWARF sections for XCOFF are not csects. They are special STYP_DWARF 976 // sections, and the individual DWARF sections are distinguished by their 977 // section subtype. 978 DwarfAbbrevSection = Ctx->getXCOFFSection( 979 ".dwabrev", SectionKind::getMetadata(), /* CsectProperties */ None, 980 /* MultiSymbolsAllowed */ true, ".dwabrev", XCOFF::SSUBTYP_DWABREV); 981 982 DwarfInfoSection = Ctx->getXCOFFSection( 983 ".dwinfo", SectionKind::getMetadata(), /* CsectProperties */ None, 984 /* MultiSymbolsAllowed */ true, ".dwinfo", XCOFF::SSUBTYP_DWINFO); 985 986 DwarfLineSection = Ctx->getXCOFFSection( 987 ".dwline", SectionKind::getMetadata(), /* CsectProperties */ None, 988 /* MultiSymbolsAllowed */ true, ".dwline", XCOFF::SSUBTYP_DWLINE); 989 990 DwarfFrameSection = Ctx->getXCOFFSection( 991 ".dwframe", SectionKind::getMetadata(), /* CsectProperties */ None, 992 /* MultiSymbolsAllowed */ true, ".dwframe", XCOFF::SSUBTYP_DWFRAME); 993 994 DwarfPubNamesSection = Ctx->getXCOFFSection( 995 ".dwpbnms", SectionKind::getMetadata(), /* CsectProperties */ None, 996 /* MultiSymbolsAllowed */ true, ".dwpbnms", XCOFF::SSUBTYP_DWPBNMS); 997 998 DwarfPubTypesSection = Ctx->getXCOFFSection( 999 ".dwpbtyp", SectionKind::getMetadata(), /* CsectProperties */ None, 1000 /* MultiSymbolsAllowed */ true, ".dwpbtyp", XCOFF::SSUBTYP_DWPBTYP); 1001 1002 DwarfStrSection = Ctx->getXCOFFSection( 1003 ".dwstr", SectionKind::getMetadata(), /* CsectProperties */ None, 1004 /* MultiSymbolsAllowed */ true, ".dwstr", XCOFF::SSUBTYP_DWSTR); 1005 1006 DwarfLocSection = Ctx->getXCOFFSection( 1007 ".dwloc", SectionKind::getMetadata(), /* CsectProperties */ None, 1008 /* MultiSymbolsAllowed */ true, ".dwloc", XCOFF::SSUBTYP_DWLOC); 1009 1010 DwarfARangesSection = Ctx->getXCOFFSection( 1011 ".dwarnge", SectionKind::getMetadata(), /* CsectProperties */ None, 1012 /* MultiSymbolsAllowed */ true, ".dwarnge", XCOFF::SSUBTYP_DWARNGE); 1013 1014 DwarfRangesSection = Ctx->getXCOFFSection( 1015 ".dwrnges", SectionKind::getMetadata(), /* CsectProperties */ None, 1016 /* MultiSymbolsAllowed */ true, ".dwrnges", XCOFF::SSUBTYP_DWRNGES); 1017 1018 DwarfMacinfoSection = Ctx->getXCOFFSection( 1019 ".dwmac", SectionKind::getMetadata(), /* CsectProperties */ None, 1020 /* MultiSymbolsAllowed */ true, ".dwmac", XCOFF::SSUBTYP_DWMAC); 1021 } 1022 1023 void MCObjectFileInfo::initDXContainerObjectFileInfo(const Triple &T) { 1024 // At the moment the DXBC section should end up empty. 1025 TextSection = Ctx->getDXContainerSection("DXBC", SectionKind::getText()); 1026 } 1027 1028 MCObjectFileInfo::~MCObjectFileInfo() = default; 1029 1030 void MCObjectFileInfo::initMCObjectFileInfo(MCContext &MCCtx, bool PIC, 1031 bool LargeCodeModel) { 1032 PositionIndependent = PIC; 1033 Ctx = &MCCtx; 1034 1035 // Common. 1036 CommDirectiveSupportsAlignment = true; 1037 SupportsWeakOmittedEHFrame = true; 1038 SupportsCompactUnwindWithoutEHFrame = false; 1039 OmitDwarfIfHaveCompactUnwind = false; 1040 1041 FDECFIEncoding = dwarf::DW_EH_PE_absptr; 1042 1043 CompactUnwindDwarfEHFrameOnly = 0; 1044 1045 EHFrameSection = nullptr; // Created on demand. 1046 CompactUnwindSection = nullptr; // Used only by selected targets. 1047 DwarfAccelNamesSection = nullptr; // Used only by selected targets. 1048 DwarfAccelObjCSection = nullptr; // Used only by selected targets. 1049 DwarfAccelNamespaceSection = nullptr; // Used only by selected targets. 1050 DwarfAccelTypesSection = nullptr; // Used only by selected targets. 1051 1052 Triple TheTriple = Ctx->getTargetTriple(); 1053 switch (Ctx->getObjectFileType()) { 1054 case MCContext::IsMachO: 1055 initMachOMCObjectFileInfo(TheTriple); 1056 break; 1057 case MCContext::IsCOFF: 1058 initCOFFMCObjectFileInfo(TheTriple); 1059 break; 1060 case MCContext::IsELF: 1061 initELFMCObjectFileInfo(TheTriple, LargeCodeModel); 1062 break; 1063 case MCContext::IsGOFF: 1064 initGOFFMCObjectFileInfo(TheTriple); 1065 break; 1066 case MCContext::IsSPIRV: 1067 initSPIRVMCObjectFileInfo(TheTriple); 1068 break; 1069 case MCContext::IsWasm: 1070 initWasmMCObjectFileInfo(TheTriple); 1071 break; 1072 case MCContext::IsXCOFF: 1073 initXCOFFMCObjectFileInfo(TheTriple); 1074 break; 1075 case MCContext::IsDXContainer: 1076 initDXContainerObjectFileInfo(TheTriple); 1077 break; 1078 } 1079 } 1080 1081 MCSection *MCObjectFileInfo::getDwarfComdatSection(const char *Name, 1082 uint64_t Hash) const { 1083 switch (Ctx->getTargetTriple().getObjectFormat()) { 1084 case Triple::ELF: 1085 return Ctx->getELFSection(Name, ELF::SHT_PROGBITS, ELF::SHF_GROUP, 0, 1086 utostr(Hash), /*IsComdat=*/true); 1087 case Triple::Wasm: 1088 return Ctx->getWasmSection(Name, SectionKind::getMetadata(), 0, 1089 utostr(Hash), MCContext::GenericSectionID); 1090 case Triple::MachO: 1091 case Triple::COFF: 1092 case Triple::GOFF: 1093 case Triple::SPIRV: 1094 case Triple::XCOFF: 1095 case Triple::DXContainer: 1096 case Triple::UnknownObjectFormat: 1097 report_fatal_error("Cannot get DWARF comdat section for this object file " 1098 "format: not implemented."); 1099 break; 1100 } 1101 llvm_unreachable("Unknown ObjectFormatType"); 1102 } 1103 1104 MCSection * 1105 MCObjectFileInfo::getStackSizesSection(const MCSection &TextSec) const { 1106 if (Ctx->getObjectFileType() != MCContext::IsELF) 1107 return StackSizesSection; 1108 1109 const MCSectionELF &ElfSec = static_cast<const MCSectionELF &>(TextSec); 1110 unsigned Flags = ELF::SHF_LINK_ORDER; 1111 StringRef GroupName; 1112 if (const MCSymbol *Group = ElfSec.getGroup()) { 1113 GroupName = Group->getName(); 1114 Flags |= ELF::SHF_GROUP; 1115 } 1116 1117 return Ctx->getELFSection(".stack_sizes", ELF::SHT_PROGBITS, Flags, 0, 1118 GroupName, true, ElfSec.getUniqueID(), 1119 cast<MCSymbolELF>(TextSec.getBeginSymbol())); 1120 } 1121 1122 MCSection * 1123 MCObjectFileInfo::getBBAddrMapSection(const MCSection &TextSec) const { 1124 if (Ctx->getObjectFileType() != MCContext::IsELF) 1125 return nullptr; 1126 1127 const MCSectionELF &ElfSec = static_cast<const MCSectionELF &>(TextSec); 1128 unsigned Flags = ELF::SHF_LINK_ORDER; 1129 StringRef GroupName; 1130 if (const MCSymbol *Group = ElfSec.getGroup()) { 1131 GroupName = Group->getName(); 1132 Flags |= ELF::SHF_GROUP; 1133 } 1134 1135 // Use the text section's begin symbol and unique ID to create a separate 1136 // .llvm_bb_addr_map section associated with every unique text section. 1137 return Ctx->getELFSection(".llvm_bb_addr_map", ELF::SHT_LLVM_BB_ADDR_MAP, 1138 Flags, 0, GroupName, true, ElfSec.getUniqueID(), 1139 cast<MCSymbolELF>(TextSec.getBeginSymbol())); 1140 } 1141 1142 MCSection * 1143 MCObjectFileInfo::getPseudoProbeSection(const MCSection *TextSec) const { 1144 if (Ctx->getObjectFileType() == MCContext::IsELF) { 1145 const auto *ElfSec = static_cast<const MCSectionELF *>(TextSec); 1146 // Create a separate section for probes that comes with a comdat function. 1147 if (const MCSymbol *Group = ElfSec->getGroup()) { 1148 auto *S = static_cast<MCSectionELF *>(PseudoProbeSection); 1149 auto Flags = S->getFlags() | ELF::SHF_GROUP; 1150 return Ctx->getELFSection(S->getName(), S->getType(), Flags, 1151 S->getEntrySize(), Group->getName(), 1152 /*IsComdat=*/true); 1153 } 1154 } 1155 return PseudoProbeSection; 1156 } 1157 1158 MCSection * 1159 MCObjectFileInfo::getPseudoProbeDescSection(StringRef FuncName) const { 1160 if (Ctx->getObjectFileType() == MCContext::IsELF) { 1161 // Create a separate comdat group for each function's descriptor in order 1162 // for the linker to deduplicate. The duplication, must be from different 1163 // tranlation unit, can come from: 1164 // 1. Inline functions defined in header files; 1165 // 2. ThinLTO imported funcions; 1166 // 3. Weak-linkage definitions. 1167 // Use a concatenation of the section name and the function name as the 1168 // group name so that descriptor-only groups won't be folded with groups of 1169 // code. 1170 if (Ctx->getTargetTriple().supportsCOMDAT() && !FuncName.empty()) { 1171 auto *S = static_cast<MCSectionELF *>(PseudoProbeDescSection); 1172 auto Flags = S->getFlags() | ELF::SHF_GROUP; 1173 return Ctx->getELFSection(S->getName(), S->getType(), Flags, 1174 S->getEntrySize(), 1175 S->getName() + "_" + FuncName, 1176 /*IsComdat=*/true); 1177 } 1178 } 1179 return PseudoProbeDescSection; 1180 } 1181