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/BinaryFormat/COFF.h" 12 #include "llvm/BinaryFormat/ELF.h" 13 #include "llvm/BinaryFormat/Wasm.h" 14 #include "llvm/MC/MCAsmInfo.h" 15 #include "llvm/MC/MCContext.h" 16 #include "llvm/MC/MCSection.h" 17 #include "llvm/MC/MCSectionCOFF.h" 18 #include "llvm/MC/MCSectionDXContainer.h" 19 #include "llvm/MC/MCSectionELF.h" 20 #include "llvm/MC/MCSectionGOFF.h" 21 #include "llvm/MC/MCSectionMachO.h" 22 #include "llvm/MC/MCSectionSPIRV.h" 23 #include "llvm/MC/MCSectionWasm.h" 24 #include "llvm/MC/MCSectionXCOFF.h" 25 #include "llvm/Support/Casting.h" 26 #include "llvm/TargetParser/Triple.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 // The rest of the simulators always have it. 52 if (T.isSimulatorEnvironment()) 53 return true; 54 55 return false; 56 } 57 58 void MCObjectFileInfo::initMachOMCObjectFileInfo(const Triple &T) { 59 // MachO 60 SupportsWeakOmittedEHFrame = false; 61 62 EHFrameSection = Ctx->getMachOSection( 63 "__TEXT", "__eh_frame", 64 MachO::S_COALESCED | MachO::S_ATTR_NO_TOC | 65 MachO::S_ATTR_STRIP_STATIC_SYMS | MachO::S_ATTR_LIVE_SUPPORT, 66 SectionKind::getReadOnly()); 67 68 if (T.isOSDarwin() && 69 (T.getArch() == Triple::aarch64 || T.getArch() == Triple::aarch64_32 || 70 T.isSimulatorEnvironment())) 71 SupportsCompactUnwindWithoutEHFrame = true; 72 73 switch (Ctx->emitDwarfUnwindInfo()) { 74 case EmitDwarfUnwindType::Always: 75 OmitDwarfIfHaveCompactUnwind = false; 76 break; 77 case EmitDwarfUnwindType::NoCompactUnwind: 78 OmitDwarfIfHaveCompactUnwind = true; 79 break; 80 case EmitDwarfUnwindType::Default: 81 OmitDwarfIfHaveCompactUnwind = 82 T.isWatchABI() || SupportsCompactUnwindWithoutEHFrame; 83 break; 84 } 85 86 FDECFIEncoding = dwarf::DW_EH_PE_pcrel; 87 88 TextSection // .text 89 = Ctx->getMachOSection("__TEXT", "__text", 90 MachO::S_ATTR_PURE_INSTRUCTIONS, 91 SectionKind::getText()); 92 DataSection // .data 93 = Ctx->getMachOSection("__DATA", "__data", 0, SectionKind::getData()); 94 95 // BSSSection might not be expected initialized on msvc. 96 BSSSection = nullptr; 97 98 TLSDataSection // .tdata 99 = Ctx->getMachOSection("__DATA", "__thread_data", 100 MachO::S_THREAD_LOCAL_REGULAR, 101 SectionKind::getData()); 102 TLSBSSSection // .tbss 103 = Ctx->getMachOSection("__DATA", "__thread_bss", 104 MachO::S_THREAD_LOCAL_ZEROFILL, 105 SectionKind::getThreadBSS()); 106 107 // TODO: Verify datarel below. 108 TLSTLVSection // .tlv 109 = Ctx->getMachOSection("__DATA", "__thread_vars", 110 MachO::S_THREAD_LOCAL_VARIABLES, 111 SectionKind::getData()); 112 113 TLSThreadInitSection = Ctx->getMachOSection( 114 "__DATA", "__thread_init", MachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS, 115 SectionKind::getData()); 116 117 CStringSection // .cstring 118 = Ctx->getMachOSection("__TEXT", "__cstring", 119 MachO::S_CSTRING_LITERALS, 120 SectionKind::getMergeable1ByteCString()); 121 UStringSection 122 = Ctx->getMachOSection("__TEXT","__ustring", 0, 123 SectionKind::getMergeable2ByteCString()); 124 FourByteConstantSection // .literal4 125 = Ctx->getMachOSection("__TEXT", "__literal4", 126 MachO::S_4BYTE_LITERALS, 127 SectionKind::getMergeableConst4()); 128 EightByteConstantSection // .literal8 129 = Ctx->getMachOSection("__TEXT", "__literal8", 130 MachO::S_8BYTE_LITERALS, 131 SectionKind::getMergeableConst8()); 132 133 SixteenByteConstantSection // .literal16 134 = Ctx->getMachOSection("__TEXT", "__literal16", 135 MachO::S_16BYTE_LITERALS, 136 SectionKind::getMergeableConst16()); 137 138 ReadOnlySection // .const 139 = Ctx->getMachOSection("__TEXT", "__const", 0, 140 SectionKind::getReadOnly()); 141 142 // If the target is not powerpc, map the coal sections to the non-coal 143 // sections. 144 // 145 // "__TEXT/__textcoal_nt" => section "__TEXT/__text" 146 // "__TEXT/__const_coal" => section "__TEXT/__const" 147 // "__DATA/__datacoal_nt" => section "__DATA/__data" 148 Triple::ArchType ArchTy = T.getArch(); 149 150 ConstDataSection // .const_data 151 = Ctx->getMachOSection("__DATA", "__const", 0, 152 SectionKind::getReadOnlyWithRel()); 153 154 if (ArchTy == Triple::ppc || ArchTy == Triple::ppc64) { 155 TextCoalSection 156 = Ctx->getMachOSection("__TEXT", "__textcoal_nt", 157 MachO::S_COALESCED | 158 MachO::S_ATTR_PURE_INSTRUCTIONS, 159 SectionKind::getText()); 160 ConstTextCoalSection 161 = Ctx->getMachOSection("__TEXT", "__const_coal", 162 MachO::S_COALESCED, 163 SectionKind::getReadOnly()); 164 DataCoalSection = Ctx->getMachOSection( 165 "__DATA", "__datacoal_nt", MachO::S_COALESCED, SectionKind::getData()); 166 ConstDataCoalSection = DataCoalSection; 167 } else { 168 TextCoalSection = TextSection; 169 ConstTextCoalSection = ReadOnlySection; 170 DataCoalSection = DataSection; 171 ConstDataCoalSection = ConstDataSection; 172 } 173 174 DataCommonSection 175 = Ctx->getMachOSection("__DATA","__common", 176 MachO::S_ZEROFILL, 177 SectionKind::getBSS()); 178 DataBSSSection 179 = Ctx->getMachOSection("__DATA","__bss", MachO::S_ZEROFILL, 180 SectionKind::getBSS()); 181 182 183 LazySymbolPointerSection 184 = Ctx->getMachOSection("__DATA", "__la_symbol_ptr", 185 MachO::S_LAZY_SYMBOL_POINTERS, 186 SectionKind::getMetadata()); 187 NonLazySymbolPointerSection 188 = Ctx->getMachOSection("__DATA", "__nl_symbol_ptr", 189 MachO::S_NON_LAZY_SYMBOL_POINTERS, 190 SectionKind::getMetadata()); 191 192 ThreadLocalPointerSection 193 = Ctx->getMachOSection("__DATA", "__thread_ptr", 194 MachO::S_THREAD_LOCAL_VARIABLE_POINTERS, 195 SectionKind::getMetadata()); 196 197 AddrSigSection = Ctx->getMachOSection("__DATA", "__llvm_addrsig", 0, 198 SectionKind::getData()); 199 200 // Exception Handling. 201 LSDASection = Ctx->getMachOSection("__TEXT", "__gcc_except_tab", 0, 202 SectionKind::getReadOnlyWithRel()); 203 204 COFFDebugSymbolsSection = nullptr; 205 COFFDebugTypesSection = nullptr; 206 COFFGlobalTypeHashesSection = nullptr; 207 208 if (useCompactUnwind(T)) { 209 CompactUnwindSection = 210 Ctx->getMachOSection("__LD", "__compact_unwind", MachO::S_ATTR_DEBUG, 211 SectionKind::getReadOnly()); 212 213 if (T.isX86()) 214 CompactUnwindDwarfEHFrameOnly = 0x04000000; // UNWIND_X86_64_MODE_DWARF 215 else if (T.getArch() == Triple::aarch64 || T.getArch() == Triple::aarch64_32) 216 CompactUnwindDwarfEHFrameOnly = 0x03000000; // UNWIND_ARM64_MODE_DWARF 217 else if (T.getArch() == Triple::arm || T.getArch() == Triple::thumb) 218 CompactUnwindDwarfEHFrameOnly = 0x04000000; // UNWIND_ARM_MODE_DWARF 219 } 220 221 // Debug Information. 222 DwarfDebugNamesSection = 223 Ctx->getMachOSection("__DWARF", "__debug_names", MachO::S_ATTR_DEBUG, 224 SectionKind::getMetadata(), "debug_names_begin"); 225 DwarfAccelNamesSection = 226 Ctx->getMachOSection("__DWARF", "__apple_names", MachO::S_ATTR_DEBUG, 227 SectionKind::getMetadata(), "names_begin"); 228 DwarfAccelObjCSection = 229 Ctx->getMachOSection("__DWARF", "__apple_objc", MachO::S_ATTR_DEBUG, 230 SectionKind::getMetadata(), "objc_begin"); 231 // 16 character section limit... 232 DwarfAccelNamespaceSection = 233 Ctx->getMachOSection("__DWARF", "__apple_namespac", MachO::S_ATTR_DEBUG, 234 SectionKind::getMetadata(), "namespac_begin"); 235 DwarfAccelTypesSection = 236 Ctx->getMachOSection("__DWARF", "__apple_types", MachO::S_ATTR_DEBUG, 237 SectionKind::getMetadata(), "types_begin"); 238 239 DwarfSwiftASTSection = 240 Ctx->getMachOSection("__DWARF", "__swift_ast", MachO::S_ATTR_DEBUG, 241 SectionKind::getMetadata()); 242 243 DwarfAbbrevSection = 244 Ctx->getMachOSection("__DWARF", "__debug_abbrev", MachO::S_ATTR_DEBUG, 245 SectionKind::getMetadata(), "section_abbrev"); 246 DwarfInfoSection = 247 Ctx->getMachOSection("__DWARF", "__debug_info", MachO::S_ATTR_DEBUG, 248 SectionKind::getMetadata(), "section_info"); 249 DwarfLineSection = 250 Ctx->getMachOSection("__DWARF", "__debug_line", MachO::S_ATTR_DEBUG, 251 SectionKind::getMetadata(), "section_line"); 252 DwarfLineStrSection = 253 Ctx->getMachOSection("__DWARF", "__debug_line_str", MachO::S_ATTR_DEBUG, 254 SectionKind::getMetadata(), "section_line_str"); 255 DwarfFrameSection = 256 Ctx->getMachOSection("__DWARF", "__debug_frame", MachO::S_ATTR_DEBUG, 257 SectionKind::getMetadata(), "section_frame"); 258 DwarfPubNamesSection = 259 Ctx->getMachOSection("__DWARF", "__debug_pubnames", MachO::S_ATTR_DEBUG, 260 SectionKind::getMetadata()); 261 DwarfPubTypesSection = 262 Ctx->getMachOSection("__DWARF", "__debug_pubtypes", MachO::S_ATTR_DEBUG, 263 SectionKind::getMetadata()); 264 DwarfGnuPubNamesSection = 265 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubn", MachO::S_ATTR_DEBUG, 266 SectionKind::getMetadata()); 267 DwarfGnuPubTypesSection = 268 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubt", MachO::S_ATTR_DEBUG, 269 SectionKind::getMetadata()); 270 DwarfStrSection = 271 Ctx->getMachOSection("__DWARF", "__debug_str", MachO::S_ATTR_DEBUG, 272 SectionKind::getMetadata(), "info_string"); 273 DwarfStrOffSection = 274 Ctx->getMachOSection("__DWARF", "__debug_str_offs", MachO::S_ATTR_DEBUG, 275 SectionKind::getMetadata(), "section_str_off"); 276 DwarfAddrSection = 277 Ctx->getMachOSection("__DWARF", "__debug_addr", MachO::S_ATTR_DEBUG, 278 SectionKind::getMetadata(), "section_info"); 279 DwarfLocSection = 280 Ctx->getMachOSection("__DWARF", "__debug_loc", MachO::S_ATTR_DEBUG, 281 SectionKind::getMetadata(), "section_debug_loc"); 282 DwarfLoclistsSection = 283 Ctx->getMachOSection("__DWARF", "__debug_loclists", MachO::S_ATTR_DEBUG, 284 SectionKind::getMetadata(), "section_debug_loc"); 285 286 DwarfARangesSection = 287 Ctx->getMachOSection("__DWARF", "__debug_aranges", MachO::S_ATTR_DEBUG, 288 SectionKind::getMetadata()); 289 DwarfRangesSection = 290 Ctx->getMachOSection("__DWARF", "__debug_ranges", MachO::S_ATTR_DEBUG, 291 SectionKind::getMetadata(), "debug_range"); 292 DwarfRnglistsSection = 293 Ctx->getMachOSection("__DWARF", "__debug_rnglists", MachO::S_ATTR_DEBUG, 294 SectionKind::getMetadata(), "debug_range"); 295 DwarfMacinfoSection = 296 Ctx->getMachOSection("__DWARF", "__debug_macinfo", MachO::S_ATTR_DEBUG, 297 SectionKind::getMetadata(), "debug_macinfo"); 298 DwarfMacroSection = 299 Ctx->getMachOSection("__DWARF", "__debug_macro", MachO::S_ATTR_DEBUG, 300 SectionKind::getMetadata(), "debug_macro"); 301 DwarfDebugInlineSection = 302 Ctx->getMachOSection("__DWARF", "__debug_inlined", MachO::S_ATTR_DEBUG, 303 SectionKind::getMetadata()); 304 DwarfCUIndexSection = 305 Ctx->getMachOSection("__DWARF", "__debug_cu_index", MachO::S_ATTR_DEBUG, 306 SectionKind::getMetadata()); 307 DwarfTUIndexSection = 308 Ctx->getMachOSection("__DWARF", "__debug_tu_index", MachO::S_ATTR_DEBUG, 309 SectionKind::getMetadata()); 310 StackMapSection = Ctx->getMachOSection("__LLVM_STACKMAPS", "__llvm_stackmaps", 311 0, SectionKind::getMetadata()); 312 313 FaultMapSection = Ctx->getMachOSection("__LLVM_FAULTMAPS", "__llvm_faultmaps", 314 0, SectionKind::getMetadata()); 315 316 RemarksSection = Ctx->getMachOSection( 317 "__LLVM", "__remarks", MachO::S_ATTR_DEBUG, SectionKind::getMetadata()); 318 319 // The architecture of dsymutil makes it very difficult to copy the Swift 320 // reflection metadata sections into the __TEXT segment, so dsymutil creates 321 // these sections in the __DWARF segment instead. 322 if (!Ctx->getSwift5ReflectionSegmentName().empty()) { 323 #define HANDLE_SWIFT_SECTION(KIND, MACHO, ELF, COFF) \ 324 Swift5ReflectionSections \ 325 [llvm::binaryformat::Swift5ReflectionSectionKind::KIND] = \ 326 Ctx->getMachOSection(Ctx->getSwift5ReflectionSegmentName().data(), \ 327 MACHO, 0, SectionKind::getMetadata()); 328 #include "llvm/BinaryFormat/Swift.def" 329 } 330 331 TLSExtraDataSection = TLSTLVSection; 332 } 333 334 void MCObjectFileInfo::initELFMCObjectFileInfo(const Triple &T, bool Large) { 335 switch (T.getArch()) { 336 case Triple::mips: 337 case Triple::mipsel: 338 case Triple::mips64: 339 case Triple::mips64el: 340 // We cannot use DW_EH_PE_sdata8 for the large PositionIndependent case 341 // since there is no R_MIPS_PC64 relocation (only a 32-bit version). 342 if (PositionIndependent && !Large) 343 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 344 else 345 FDECFIEncoding = Ctx->getAsmInfo()->getCodePointerSize() == 4 346 ? dwarf::DW_EH_PE_sdata4 347 : dwarf::DW_EH_PE_sdata8; 348 break; 349 case Triple::ppc64: 350 case Triple::ppc64le: 351 case Triple::aarch64: 352 case Triple::aarch64_be: 353 case Triple::x86_64: 354 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | 355 (Large ? dwarf::DW_EH_PE_sdata8 : dwarf::DW_EH_PE_sdata4); 356 break; 357 case Triple::bpfel: 358 case Triple::bpfeb: 359 FDECFIEncoding = dwarf::DW_EH_PE_sdata8; 360 break; 361 case Triple::hexagon: 362 FDECFIEncoding = 363 PositionIndependent ? dwarf::DW_EH_PE_pcrel : dwarf::DW_EH_PE_absptr; 364 break; 365 case Triple::xtensa: 366 FDECFIEncoding = dwarf::DW_EH_PE_sdata4; 367 break; 368 default: 369 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 370 break; 371 } 372 373 unsigned EHSectionType = T.getArch() == Triple::x86_64 374 ? ELF::SHT_X86_64_UNWIND 375 : ELF::SHT_PROGBITS; 376 377 // Solaris requires different flags for .eh_frame to seemingly every other 378 // platform. 379 unsigned EHSectionFlags = ELF::SHF_ALLOC; 380 if (T.isOSSolaris() && T.getArch() != Triple::x86_64) 381 EHSectionFlags |= ELF::SHF_WRITE; 382 383 // ELF 384 BSSSection = Ctx->getELFSection(".bss", ELF::SHT_NOBITS, 385 ELF::SHF_WRITE | ELF::SHF_ALLOC); 386 387 TextSection = Ctx->getELFSection(".text", ELF::SHT_PROGBITS, 388 ELF::SHF_EXECINSTR | ELF::SHF_ALLOC); 389 390 DataSection = Ctx->getELFSection(".data", ELF::SHT_PROGBITS, 391 ELF::SHF_WRITE | ELF::SHF_ALLOC); 392 393 ReadOnlySection = 394 Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); 395 396 TLSDataSection = 397 Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS, 398 ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE); 399 400 TLSBSSSection = Ctx->getELFSection( 401 ".tbss", ELF::SHT_NOBITS, ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE); 402 403 DataRelROSection = Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS, 404 ELF::SHF_ALLOC | ELF::SHF_WRITE); 405 406 MergeableConst4Section = 407 Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS, 408 ELF::SHF_ALLOC | ELF::SHF_MERGE, 4); 409 410 MergeableConst8Section = 411 Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS, 412 ELF::SHF_ALLOC | ELF::SHF_MERGE, 8); 413 414 MergeableConst16Section = 415 Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS, 416 ELF::SHF_ALLOC | ELF::SHF_MERGE, 16); 417 418 MergeableConst32Section = 419 Ctx->getELFSection(".rodata.cst32", ELF::SHT_PROGBITS, 420 ELF::SHF_ALLOC | ELF::SHF_MERGE, 32); 421 422 // Exception Handling Sections. 423 424 // FIXME: We're emitting LSDA info into a readonly section on ELF, even though 425 // it contains relocatable pointers. In PIC mode, this is probably a big 426 // runtime hit for C++ apps. Either the contents of the LSDA need to be 427 // adjusted or this should be a data section. 428 LSDASection = Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS, 429 ELF::SHF_ALLOC); 430 431 COFFDebugSymbolsSection = nullptr; 432 COFFDebugTypesSection = nullptr; 433 434 unsigned DebugSecType = ELF::SHT_PROGBITS; 435 436 // MIPS .debug_* sections should have SHT_MIPS_DWARF section type 437 // to distinguish among sections contain DWARF and ECOFF debug formats. 438 // Sections with ECOFF debug format are obsoleted and marked by SHT_PROGBITS. 439 if (T.isMIPS()) 440 DebugSecType = ELF::SHT_MIPS_DWARF; 441 442 // Debug Info Sections. 443 DwarfAbbrevSection = 444 Ctx->getELFSection(".debug_abbrev", DebugSecType, 0); 445 DwarfInfoSection = Ctx->getELFSection(".debug_info", DebugSecType, 0); 446 DwarfLineSection = Ctx->getELFSection(".debug_line", DebugSecType, 0); 447 DwarfLineStrSection = 448 Ctx->getELFSection(".debug_line_str", DebugSecType, 449 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1); 450 DwarfFrameSection = Ctx->getELFSection(".debug_frame", DebugSecType, 0); 451 DwarfPubNamesSection = 452 Ctx->getELFSection(".debug_pubnames", DebugSecType, 0); 453 DwarfPubTypesSection = 454 Ctx->getELFSection(".debug_pubtypes", DebugSecType, 0); 455 DwarfGnuPubNamesSection = 456 Ctx->getELFSection(".debug_gnu_pubnames", DebugSecType, 0); 457 DwarfGnuPubTypesSection = 458 Ctx->getELFSection(".debug_gnu_pubtypes", DebugSecType, 0); 459 DwarfStrSection = 460 Ctx->getELFSection(".debug_str", DebugSecType, 461 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1); 462 DwarfLocSection = Ctx->getELFSection(".debug_loc", DebugSecType, 0); 463 DwarfARangesSection = 464 Ctx->getELFSection(".debug_aranges", DebugSecType, 0); 465 DwarfRangesSection = 466 Ctx->getELFSection(".debug_ranges", DebugSecType, 0); 467 DwarfMacinfoSection = 468 Ctx->getELFSection(".debug_macinfo", DebugSecType, 0); 469 DwarfMacroSection = Ctx->getELFSection(".debug_macro", DebugSecType, 0); 470 471 // DWARF5 Experimental Debug Info 472 473 // Accelerator Tables 474 DwarfDebugNamesSection = 475 Ctx->getELFSection(".debug_names", ELF::SHT_PROGBITS, 0); 476 DwarfAccelNamesSection = 477 Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0); 478 DwarfAccelObjCSection = 479 Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0); 480 DwarfAccelNamespaceSection = 481 Ctx->getELFSection(".apple_namespaces", ELF::SHT_PROGBITS, 0); 482 DwarfAccelTypesSection = 483 Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0); 484 485 // String Offset and Address Sections 486 DwarfStrOffSection = 487 Ctx->getELFSection(".debug_str_offsets", DebugSecType, 0); 488 DwarfAddrSection = Ctx->getELFSection(".debug_addr", DebugSecType, 0); 489 DwarfRnglistsSection = Ctx->getELFSection(".debug_rnglists", DebugSecType, 0); 490 DwarfLoclistsSection = Ctx->getELFSection(".debug_loclists", DebugSecType, 0); 491 492 // Fission Sections 493 DwarfInfoDWOSection = 494 Ctx->getELFSection(".debug_info.dwo", DebugSecType, ELF::SHF_EXCLUDE); 495 DwarfTypesDWOSection = 496 Ctx->getELFSection(".debug_types.dwo", DebugSecType, ELF::SHF_EXCLUDE); 497 DwarfAbbrevDWOSection = 498 Ctx->getELFSection(".debug_abbrev.dwo", DebugSecType, ELF::SHF_EXCLUDE); 499 DwarfStrDWOSection = Ctx->getELFSection( 500 ".debug_str.dwo", DebugSecType, 501 ELF::SHF_MERGE | ELF::SHF_STRINGS | ELF::SHF_EXCLUDE, 1); 502 DwarfLineDWOSection = 503 Ctx->getELFSection(".debug_line.dwo", DebugSecType, ELF::SHF_EXCLUDE); 504 DwarfLocDWOSection = 505 Ctx->getELFSection(".debug_loc.dwo", DebugSecType, ELF::SHF_EXCLUDE); 506 DwarfStrOffDWOSection = Ctx->getELFSection(".debug_str_offsets.dwo", 507 DebugSecType, ELF::SHF_EXCLUDE); 508 DwarfRnglistsDWOSection = 509 Ctx->getELFSection(".debug_rnglists.dwo", DebugSecType, ELF::SHF_EXCLUDE); 510 DwarfMacinfoDWOSection = 511 Ctx->getELFSection(".debug_macinfo.dwo", DebugSecType, ELF::SHF_EXCLUDE); 512 DwarfMacroDWOSection = 513 Ctx->getELFSection(".debug_macro.dwo", DebugSecType, ELF::SHF_EXCLUDE); 514 515 DwarfLoclistsDWOSection = 516 Ctx->getELFSection(".debug_loclists.dwo", DebugSecType, ELF::SHF_EXCLUDE); 517 518 // DWP Sections 519 DwarfCUIndexSection = 520 Ctx->getELFSection(".debug_cu_index", DebugSecType, 0); 521 DwarfTUIndexSection = 522 Ctx->getELFSection(".debug_tu_index", DebugSecType, 0); 523 524 StackMapSection = 525 Ctx->getELFSection(".llvm_stackmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); 526 527 FaultMapSection = 528 Ctx->getELFSection(".llvm_faultmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); 529 530 EHFrameSection = 531 Ctx->getELFSection(".eh_frame", EHSectionType, EHSectionFlags); 532 533 StackSizesSection = Ctx->getELFSection(".stack_sizes", ELF::SHT_PROGBITS, 0); 534 535 PseudoProbeSection = Ctx->getELFSection(".pseudo_probe", DebugSecType, 0); 536 PseudoProbeDescSection = 537 Ctx->getELFSection(".pseudo_probe_desc", DebugSecType, 0); 538 539 LLVMStatsSection = Ctx->getELFSection(".llvm_stats", ELF::SHT_PROGBITS, 0); 540 } 541 542 void MCObjectFileInfo::initGOFFMCObjectFileInfo(const Triple &T) { 543 TextSection = 544 Ctx->getGOFFSection(".text", SectionKind::getText(), nullptr, nullptr); 545 BSSSection = 546 Ctx->getGOFFSection(".bss", SectionKind::getBSS(), nullptr, nullptr); 547 PPA1Section = 548 Ctx->getGOFFSection(".ppa1", SectionKind::getMetadata(), TextSection, 549 MCConstantExpr::create(GOFF::SK_PPA1, *Ctx)); 550 ADASection = 551 Ctx->getGOFFSection(".ada", SectionKind::getData(), nullptr, nullptr); 552 } 553 554 void MCObjectFileInfo::initCOFFMCObjectFileInfo(const Triple &T) { 555 EHFrameSection = 556 Ctx->getCOFFSection(".eh_frame", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 557 COFF::IMAGE_SCN_MEM_READ, 558 SectionKind::getData()); 559 560 // Set the `IMAGE_SCN_MEM_16BIT` flag when compiling for thumb mode. This is 561 // used to indicate to the linker that the text segment contains thumb instructions 562 // and to set the ISA selection bit for calls accordingly. 563 const bool IsThumb = T.getArch() == Triple::thumb; 564 565 // COFF 566 BSSSection = Ctx->getCOFFSection( 567 ".bss", COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA | 568 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE, 569 SectionKind::getBSS()); 570 TextSection = Ctx->getCOFFSection( 571 ".text", 572 (IsThumb ? COFF::IMAGE_SCN_MEM_16BIT : (COFF::SectionCharacteristics)0) | 573 COFF::IMAGE_SCN_CNT_CODE | COFF::IMAGE_SCN_MEM_EXECUTE | 574 COFF::IMAGE_SCN_MEM_READ, 575 SectionKind::getText()); 576 DataSection = Ctx->getCOFFSection( 577 ".data", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ | 578 COFF::IMAGE_SCN_MEM_WRITE, 579 SectionKind::getData()); 580 ReadOnlySection = Ctx->getCOFFSection( 581 ".rdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, 582 SectionKind::getReadOnly()); 583 584 if (T.getArch() == Triple::x86_64 || T.getArch() == Triple::aarch64 || 585 T.getArch() == Triple::arm || T.getArch() == Triple::thumb) { 586 // On Windows with SEH, the LSDA is emitted into the .xdata section 587 LSDASection = nullptr; 588 } else { 589 LSDASection = Ctx->getCOFFSection(".gcc_except_table", 590 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 591 COFF::IMAGE_SCN_MEM_READ, 592 SectionKind::getReadOnly()); 593 } 594 595 // Debug info. 596 COFFDebugSymbolsSection = 597 Ctx->getCOFFSection(".debug$S", (COFF::IMAGE_SCN_MEM_DISCARDABLE | 598 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 599 COFF::IMAGE_SCN_MEM_READ), 600 SectionKind::getMetadata()); 601 COFFDebugTypesSection = 602 Ctx->getCOFFSection(".debug$T", (COFF::IMAGE_SCN_MEM_DISCARDABLE | 603 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 604 COFF::IMAGE_SCN_MEM_READ), 605 SectionKind::getMetadata()); 606 COFFGlobalTypeHashesSection = Ctx->getCOFFSection( 607 ".debug$H", 608 (COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 609 COFF::IMAGE_SCN_MEM_READ), 610 SectionKind::getMetadata()); 611 612 DwarfAbbrevSection = Ctx->getCOFFSection( 613 ".debug_abbrev", 614 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 615 COFF::IMAGE_SCN_MEM_READ, 616 SectionKind::getMetadata(), "section_abbrev"); 617 DwarfInfoSection = Ctx->getCOFFSection( 618 ".debug_info", 619 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 620 COFF::IMAGE_SCN_MEM_READ, 621 SectionKind::getMetadata(), "section_info"); 622 DwarfLineSection = Ctx->getCOFFSection( 623 ".debug_line", 624 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 625 COFF::IMAGE_SCN_MEM_READ, 626 SectionKind::getMetadata(), "section_line"); 627 DwarfLineStrSection = Ctx->getCOFFSection( 628 ".debug_line_str", 629 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 630 COFF::IMAGE_SCN_MEM_READ, 631 SectionKind::getMetadata(), "section_line_str"); 632 DwarfFrameSection = Ctx->getCOFFSection( 633 ".debug_frame", 634 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 635 COFF::IMAGE_SCN_MEM_READ, 636 SectionKind::getMetadata()); 637 DwarfPubNamesSection = Ctx->getCOFFSection( 638 ".debug_pubnames", 639 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 640 COFF::IMAGE_SCN_MEM_READ, 641 SectionKind::getMetadata()); 642 DwarfPubTypesSection = Ctx->getCOFFSection( 643 ".debug_pubtypes", 644 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 645 COFF::IMAGE_SCN_MEM_READ, 646 SectionKind::getMetadata()); 647 DwarfGnuPubNamesSection = Ctx->getCOFFSection( 648 ".debug_gnu_pubnames", 649 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 650 COFF::IMAGE_SCN_MEM_READ, 651 SectionKind::getMetadata()); 652 DwarfGnuPubTypesSection = Ctx->getCOFFSection( 653 ".debug_gnu_pubtypes", 654 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 655 COFF::IMAGE_SCN_MEM_READ, 656 SectionKind::getMetadata()); 657 DwarfStrSection = Ctx->getCOFFSection( 658 ".debug_str", 659 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 660 COFF::IMAGE_SCN_MEM_READ, 661 SectionKind::getMetadata(), "info_string"); 662 DwarfStrOffSection = Ctx->getCOFFSection( 663 ".debug_str_offsets", 664 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 665 COFF::IMAGE_SCN_MEM_READ, 666 SectionKind::getMetadata(), "section_str_off"); 667 DwarfLocSection = Ctx->getCOFFSection( 668 ".debug_loc", 669 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 670 COFF::IMAGE_SCN_MEM_READ, 671 SectionKind::getMetadata(), "section_debug_loc"); 672 DwarfLoclistsSection = Ctx->getCOFFSection( 673 ".debug_loclists", 674 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 675 COFF::IMAGE_SCN_MEM_READ, 676 SectionKind::getMetadata(), "section_debug_loclists"); 677 DwarfARangesSection = Ctx->getCOFFSection( 678 ".debug_aranges", 679 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 680 COFF::IMAGE_SCN_MEM_READ, 681 SectionKind::getMetadata()); 682 DwarfRangesSection = Ctx->getCOFFSection( 683 ".debug_ranges", 684 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 685 COFF::IMAGE_SCN_MEM_READ, 686 SectionKind::getMetadata(), "debug_range"); 687 DwarfRnglistsSection = Ctx->getCOFFSection( 688 ".debug_rnglists", 689 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 690 COFF::IMAGE_SCN_MEM_READ, 691 SectionKind::getMetadata(), "debug_rnglists"); 692 DwarfMacinfoSection = Ctx->getCOFFSection( 693 ".debug_macinfo", 694 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 695 COFF::IMAGE_SCN_MEM_READ, 696 SectionKind::getMetadata(), "debug_macinfo"); 697 DwarfMacroSection = Ctx->getCOFFSection( 698 ".debug_macro", 699 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 700 COFF::IMAGE_SCN_MEM_READ, 701 SectionKind::getMetadata(), "debug_macro"); 702 DwarfMacinfoDWOSection = Ctx->getCOFFSection( 703 ".debug_macinfo.dwo", 704 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 705 COFF::IMAGE_SCN_MEM_READ, 706 SectionKind::getMetadata(), "debug_macinfo.dwo"); 707 DwarfMacroDWOSection = Ctx->getCOFFSection( 708 ".debug_macro.dwo", 709 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 710 COFF::IMAGE_SCN_MEM_READ, 711 SectionKind::getMetadata(), "debug_macro.dwo"); 712 DwarfInfoDWOSection = Ctx->getCOFFSection( 713 ".debug_info.dwo", 714 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 715 COFF::IMAGE_SCN_MEM_READ, 716 SectionKind::getMetadata(), "section_info_dwo"); 717 DwarfTypesDWOSection = Ctx->getCOFFSection( 718 ".debug_types.dwo", 719 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 720 COFF::IMAGE_SCN_MEM_READ, 721 SectionKind::getMetadata(), "section_types_dwo"); 722 DwarfAbbrevDWOSection = Ctx->getCOFFSection( 723 ".debug_abbrev.dwo", 724 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 725 COFF::IMAGE_SCN_MEM_READ, 726 SectionKind::getMetadata(), "section_abbrev_dwo"); 727 DwarfStrDWOSection = Ctx->getCOFFSection( 728 ".debug_str.dwo", 729 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 730 COFF::IMAGE_SCN_MEM_READ, 731 SectionKind::getMetadata(), "skel_string"); 732 DwarfLineDWOSection = Ctx->getCOFFSection( 733 ".debug_line.dwo", 734 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 735 COFF::IMAGE_SCN_MEM_READ, 736 SectionKind::getMetadata()); 737 DwarfLocDWOSection = Ctx->getCOFFSection( 738 ".debug_loc.dwo", 739 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 740 COFF::IMAGE_SCN_MEM_READ, 741 SectionKind::getMetadata(), "skel_loc"); 742 DwarfStrOffDWOSection = Ctx->getCOFFSection( 743 ".debug_str_offsets.dwo", 744 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 745 COFF::IMAGE_SCN_MEM_READ, 746 SectionKind::getMetadata(), "section_str_off_dwo"); 747 DwarfAddrSection = Ctx->getCOFFSection( 748 ".debug_addr", 749 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 750 COFF::IMAGE_SCN_MEM_READ, 751 SectionKind::getMetadata(), "addr_sec"); 752 DwarfCUIndexSection = Ctx->getCOFFSection( 753 ".debug_cu_index", 754 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 755 COFF::IMAGE_SCN_MEM_READ, 756 SectionKind::getMetadata()); 757 DwarfTUIndexSection = Ctx->getCOFFSection( 758 ".debug_tu_index", 759 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 760 COFF::IMAGE_SCN_MEM_READ, 761 SectionKind::getMetadata()); 762 DwarfDebugNamesSection = Ctx->getCOFFSection( 763 ".debug_names", 764 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 765 COFF::IMAGE_SCN_MEM_READ, 766 SectionKind::getMetadata(), "debug_names_begin"); 767 DwarfAccelNamesSection = Ctx->getCOFFSection( 768 ".apple_names", 769 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 770 COFF::IMAGE_SCN_MEM_READ, 771 SectionKind::getMetadata(), "names_begin"); 772 DwarfAccelNamespaceSection = Ctx->getCOFFSection( 773 ".apple_namespaces", 774 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 775 COFF::IMAGE_SCN_MEM_READ, 776 SectionKind::getMetadata(), "namespac_begin"); 777 DwarfAccelTypesSection = Ctx->getCOFFSection( 778 ".apple_types", 779 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 780 COFF::IMAGE_SCN_MEM_READ, 781 SectionKind::getMetadata(), "types_begin"); 782 DwarfAccelObjCSection = Ctx->getCOFFSection( 783 ".apple_objc", 784 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 785 COFF::IMAGE_SCN_MEM_READ, 786 SectionKind::getMetadata(), "objc_begin"); 787 788 DrectveSection = Ctx->getCOFFSection( 789 ".drectve", COFF::IMAGE_SCN_LNK_INFO | COFF::IMAGE_SCN_LNK_REMOVE, 790 SectionKind::getMetadata()); 791 792 PDataSection = Ctx->getCOFFSection( 793 ".pdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, 794 SectionKind::getData()); 795 796 XDataSection = Ctx->getCOFFSection( 797 ".xdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, 798 SectionKind::getData()); 799 800 SXDataSection = Ctx->getCOFFSection(".sxdata", COFF::IMAGE_SCN_LNK_INFO, 801 SectionKind::getMetadata()); 802 803 GEHContSection = Ctx->getCOFFSection(".gehcont$y", 804 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 805 COFF::IMAGE_SCN_MEM_READ, 806 SectionKind::getMetadata()); 807 808 GFIDsSection = Ctx->getCOFFSection(".gfids$y", 809 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 810 COFF::IMAGE_SCN_MEM_READ, 811 SectionKind::getMetadata()); 812 813 GIATsSection = Ctx->getCOFFSection(".giats$y", 814 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 815 COFF::IMAGE_SCN_MEM_READ, 816 SectionKind::getMetadata()); 817 818 GLJMPSection = Ctx->getCOFFSection(".gljmp$y", 819 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 820 COFF::IMAGE_SCN_MEM_READ, 821 SectionKind::getMetadata()); 822 823 TLSDataSection = Ctx->getCOFFSection( 824 ".tls$", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ | 825 COFF::IMAGE_SCN_MEM_WRITE, 826 SectionKind::getData()); 827 828 StackMapSection = Ctx->getCOFFSection(".llvm_stackmaps", 829 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 830 COFF::IMAGE_SCN_MEM_READ, 831 SectionKind::getReadOnly()); 832 } 833 834 void MCObjectFileInfo::initSPIRVMCObjectFileInfo(const Triple &T) { 835 // Put everything in a single binary section. 836 TextSection = Ctx->getSPIRVSection(); 837 } 838 839 void MCObjectFileInfo::initWasmMCObjectFileInfo(const Triple &T) { 840 TextSection = Ctx->getWasmSection(".text", SectionKind::getText()); 841 DataSection = Ctx->getWasmSection(".data", SectionKind::getData()); 842 843 DwarfLineSection = 844 Ctx->getWasmSection(".debug_line", SectionKind::getMetadata()); 845 DwarfLineStrSection = 846 Ctx->getWasmSection(".debug_line_str", SectionKind::getMetadata(), 847 wasm::WASM_SEG_FLAG_STRINGS); 848 DwarfStrSection = Ctx->getWasmSection( 849 ".debug_str", SectionKind::getMetadata(), wasm::WASM_SEG_FLAG_STRINGS); 850 DwarfLocSection = 851 Ctx->getWasmSection(".debug_loc", SectionKind::getMetadata()); 852 DwarfAbbrevSection = 853 Ctx->getWasmSection(".debug_abbrev", SectionKind::getMetadata()); 854 DwarfARangesSection = Ctx->getWasmSection(".debug_aranges", SectionKind::getMetadata()); 855 DwarfRangesSection = 856 Ctx->getWasmSection(".debug_ranges", SectionKind::getMetadata()); 857 DwarfMacinfoSection = 858 Ctx->getWasmSection(".debug_macinfo", SectionKind::getMetadata()); 859 DwarfMacroSection = 860 Ctx->getWasmSection(".debug_macro", SectionKind::getMetadata()); 861 DwarfCUIndexSection = Ctx->getWasmSection(".debug_cu_index", SectionKind::getMetadata()); 862 DwarfTUIndexSection = Ctx->getWasmSection(".debug_tu_index", SectionKind::getMetadata()); 863 DwarfInfoSection = 864 Ctx->getWasmSection(".debug_info", SectionKind::getMetadata()); 865 DwarfFrameSection = Ctx->getWasmSection(".debug_frame", SectionKind::getMetadata()); 866 DwarfPubNamesSection = Ctx->getWasmSection(".debug_pubnames", SectionKind::getMetadata()); 867 DwarfPubTypesSection = Ctx->getWasmSection(".debug_pubtypes", SectionKind::getMetadata()); 868 DwarfGnuPubNamesSection = 869 Ctx->getWasmSection(".debug_gnu_pubnames", SectionKind::getMetadata()); 870 DwarfGnuPubTypesSection = 871 Ctx->getWasmSection(".debug_gnu_pubtypes", SectionKind::getMetadata()); 872 873 DwarfDebugNamesSection = 874 Ctx->getWasmSection(".debug_names", SectionKind::getMetadata()); 875 DwarfStrOffSection = 876 Ctx->getWasmSection(".debug_str_offsets", SectionKind::getMetadata()); 877 DwarfAddrSection = 878 Ctx->getWasmSection(".debug_addr", SectionKind::getMetadata()); 879 DwarfRnglistsSection = 880 Ctx->getWasmSection(".debug_rnglists", SectionKind::getMetadata()); 881 DwarfLoclistsSection = 882 Ctx->getWasmSection(".debug_loclists", SectionKind::getMetadata()); 883 884 // Fission Sections 885 DwarfInfoDWOSection = 886 Ctx->getWasmSection(".debug_info.dwo", SectionKind::getMetadata()); 887 DwarfTypesDWOSection = 888 Ctx->getWasmSection(".debug_types.dwo", SectionKind::getMetadata()); 889 DwarfAbbrevDWOSection = 890 Ctx->getWasmSection(".debug_abbrev.dwo", SectionKind::getMetadata()); 891 DwarfStrDWOSection = 892 Ctx->getWasmSection(".debug_str.dwo", SectionKind::getMetadata(), 893 wasm::WASM_SEG_FLAG_STRINGS); 894 DwarfLineDWOSection = 895 Ctx->getWasmSection(".debug_line.dwo", SectionKind::getMetadata()); 896 DwarfLocDWOSection = 897 Ctx->getWasmSection(".debug_loc.dwo", SectionKind::getMetadata()); 898 DwarfStrOffDWOSection = 899 Ctx->getWasmSection(".debug_str_offsets.dwo", SectionKind::getMetadata()); 900 DwarfRnglistsDWOSection = 901 Ctx->getWasmSection(".debug_rnglists.dwo", SectionKind::getMetadata()); 902 DwarfMacinfoDWOSection = 903 Ctx->getWasmSection(".debug_macinfo.dwo", SectionKind::getMetadata()); 904 DwarfMacroDWOSection = 905 Ctx->getWasmSection(".debug_macro.dwo", SectionKind::getMetadata()); 906 907 DwarfLoclistsDWOSection = 908 Ctx->getWasmSection(".debug_loclists.dwo", SectionKind::getMetadata()); 909 910 // DWP Sections 911 DwarfCUIndexSection = 912 Ctx->getWasmSection(".debug_cu_index", SectionKind::getMetadata()); 913 DwarfTUIndexSection = 914 Ctx->getWasmSection(".debug_tu_index", SectionKind::getMetadata()); 915 916 // Wasm use data section for LSDA. 917 // TODO Consider putting each function's exception table in a separate 918 // section, as in -function-sections, to facilitate lld's --gc-section. 919 LSDASection = Ctx->getWasmSection(".rodata.gcc_except_table", 920 SectionKind::getReadOnlyWithRel()); 921 922 // TODO: Define more sections. 923 } 924 925 void MCObjectFileInfo::initXCOFFMCObjectFileInfo(const Triple &T) { 926 // The default csect for program code. Functions without a specified section 927 // get placed into this csect. The choice of csect name is not a property of 928 // the ABI or object file format, but various tools rely on the section 929 // name being empty (considering named symbols to be "user symbol names"). 930 TextSection = Ctx->getXCOFFSection( 931 "", SectionKind::getText(), 932 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_PR, XCOFF::XTY_SD), 933 /* MultiSymbolsAllowed*/ true); 934 935 DataSection = Ctx->getXCOFFSection( 936 ".data", SectionKind::getData(), 937 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_RW, XCOFF::XTY_SD), 938 /* MultiSymbolsAllowed*/ true); 939 940 ReadOnlySection = Ctx->getXCOFFSection( 941 ".rodata", SectionKind::getReadOnly(), 942 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_RO, XCOFF::XTY_SD), 943 /* MultiSymbolsAllowed*/ true); 944 ReadOnlySection->setAlignment(Align(4)); 945 946 ReadOnly8Section = Ctx->getXCOFFSection( 947 ".rodata.8", SectionKind::getReadOnly(), 948 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_RO, XCOFF::XTY_SD), 949 /* MultiSymbolsAllowed*/ true); 950 ReadOnly8Section->setAlignment(Align(8)); 951 952 ReadOnly16Section = Ctx->getXCOFFSection( 953 ".rodata.16", SectionKind::getReadOnly(), 954 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_RO, XCOFF::XTY_SD), 955 /* MultiSymbolsAllowed*/ true); 956 ReadOnly16Section->setAlignment(Align(16)); 957 958 TLSDataSection = Ctx->getXCOFFSection( 959 ".tdata", SectionKind::getThreadData(), 960 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_TL, XCOFF::XTY_SD), 961 /* MultiSymbolsAllowed*/ true); 962 963 TOCBaseSection = Ctx->getXCOFFSection( 964 "TOC", SectionKind::getData(), 965 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_TC0, 966 XCOFF::XTY_SD)); 967 968 // The TOC-base always has 0 size, but 4 byte alignment. 969 TOCBaseSection->setAlignment(Align(4)); 970 971 LSDASection = Ctx->getXCOFFSection( 972 ".gcc_except_table", SectionKind::getReadOnly(), 973 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_RO, 974 XCOFF::XTY_SD)); 975 976 CompactUnwindSection = Ctx->getXCOFFSection( 977 ".eh_info_table", SectionKind::getData(), 978 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_RW, 979 XCOFF::XTY_SD)); 980 981 // DWARF sections for XCOFF are not csects. They are special STYP_DWARF 982 // sections, and the individual DWARF sections are distinguished by their 983 // section subtype. 984 DwarfAbbrevSection = Ctx->getXCOFFSection( 985 ".dwabrev", SectionKind::getMetadata(), 986 /* CsectProperties */ std::nullopt, 987 /* MultiSymbolsAllowed */ true, ".dwabrev", XCOFF::SSUBTYP_DWABREV); 988 989 DwarfInfoSection = Ctx->getXCOFFSection( 990 ".dwinfo", SectionKind::getMetadata(), /* CsectProperties */ std::nullopt, 991 /* MultiSymbolsAllowed */ true, ".dwinfo", XCOFF::SSUBTYP_DWINFO); 992 993 DwarfLineSection = Ctx->getXCOFFSection( 994 ".dwline", SectionKind::getMetadata(), /* CsectProperties */ std::nullopt, 995 /* MultiSymbolsAllowed */ true, ".dwline", XCOFF::SSUBTYP_DWLINE); 996 997 DwarfFrameSection = Ctx->getXCOFFSection( 998 ".dwframe", SectionKind::getMetadata(), 999 /* CsectProperties */ std::nullopt, 1000 /* MultiSymbolsAllowed */ true, ".dwframe", XCOFF::SSUBTYP_DWFRAME); 1001 1002 DwarfPubNamesSection = Ctx->getXCOFFSection( 1003 ".dwpbnms", SectionKind::getMetadata(), 1004 /* CsectProperties */ std::nullopt, 1005 /* MultiSymbolsAllowed */ true, ".dwpbnms", XCOFF::SSUBTYP_DWPBNMS); 1006 1007 DwarfPubTypesSection = Ctx->getXCOFFSection( 1008 ".dwpbtyp", SectionKind::getMetadata(), 1009 /* CsectProperties */ std::nullopt, 1010 /* MultiSymbolsAllowed */ true, ".dwpbtyp", XCOFF::SSUBTYP_DWPBTYP); 1011 1012 DwarfStrSection = Ctx->getXCOFFSection( 1013 ".dwstr", SectionKind::getMetadata(), /* CsectProperties */ std::nullopt, 1014 /* MultiSymbolsAllowed */ true, ".dwstr", XCOFF::SSUBTYP_DWSTR); 1015 1016 DwarfLocSection = Ctx->getXCOFFSection( 1017 ".dwloc", SectionKind::getMetadata(), /* CsectProperties */ std::nullopt, 1018 /* MultiSymbolsAllowed */ true, ".dwloc", XCOFF::SSUBTYP_DWLOC); 1019 1020 DwarfARangesSection = Ctx->getXCOFFSection( 1021 ".dwarnge", SectionKind::getMetadata(), 1022 /* CsectProperties */ std::nullopt, 1023 /* MultiSymbolsAllowed */ true, ".dwarnge", XCOFF::SSUBTYP_DWARNGE); 1024 1025 DwarfRangesSection = Ctx->getXCOFFSection( 1026 ".dwrnges", SectionKind::getMetadata(), 1027 /* CsectProperties */ std::nullopt, 1028 /* MultiSymbolsAllowed */ true, ".dwrnges", XCOFF::SSUBTYP_DWRNGES); 1029 1030 DwarfMacinfoSection = Ctx->getXCOFFSection( 1031 ".dwmac", SectionKind::getMetadata(), /* CsectProperties */ std::nullopt, 1032 /* MultiSymbolsAllowed */ true, ".dwmac", XCOFF::SSUBTYP_DWMAC); 1033 } 1034 1035 void MCObjectFileInfo::initDXContainerObjectFileInfo(const Triple &T) { 1036 // At the moment the DXBC section should end up empty. 1037 TextSection = Ctx->getDXContainerSection("DXBC", SectionKind::getText()); 1038 } 1039 1040 MCObjectFileInfo::~MCObjectFileInfo() = default; 1041 1042 void MCObjectFileInfo::initMCObjectFileInfo(MCContext &MCCtx, bool PIC, 1043 bool LargeCodeModel) { 1044 PositionIndependent = PIC; 1045 Ctx = &MCCtx; 1046 1047 // Common. 1048 SupportsWeakOmittedEHFrame = true; 1049 SupportsCompactUnwindWithoutEHFrame = false; 1050 OmitDwarfIfHaveCompactUnwind = false; 1051 1052 FDECFIEncoding = dwarf::DW_EH_PE_absptr; 1053 1054 CompactUnwindDwarfEHFrameOnly = 0; 1055 1056 EHFrameSection = nullptr; // Created on demand. 1057 CompactUnwindSection = nullptr; // Used only by selected targets. 1058 DwarfAccelNamesSection = nullptr; // Used only by selected targets. 1059 DwarfAccelObjCSection = nullptr; // Used only by selected targets. 1060 DwarfAccelNamespaceSection = nullptr; // Used only by selected targets. 1061 DwarfAccelTypesSection = nullptr; // Used only by selected targets. 1062 1063 Triple TheTriple = Ctx->getTargetTriple(); 1064 switch (Ctx->getObjectFileType()) { 1065 case MCContext::IsMachO: 1066 initMachOMCObjectFileInfo(TheTriple); 1067 break; 1068 case MCContext::IsCOFF: 1069 initCOFFMCObjectFileInfo(TheTriple); 1070 break; 1071 case MCContext::IsELF: 1072 initELFMCObjectFileInfo(TheTriple, LargeCodeModel); 1073 break; 1074 case MCContext::IsGOFF: 1075 initGOFFMCObjectFileInfo(TheTriple); 1076 break; 1077 case MCContext::IsSPIRV: 1078 initSPIRVMCObjectFileInfo(TheTriple); 1079 break; 1080 case MCContext::IsWasm: 1081 initWasmMCObjectFileInfo(TheTriple); 1082 break; 1083 case MCContext::IsXCOFF: 1084 initXCOFFMCObjectFileInfo(TheTriple); 1085 break; 1086 case MCContext::IsDXContainer: 1087 initDXContainerObjectFileInfo(TheTriple); 1088 break; 1089 } 1090 } 1091 1092 MCSection *MCObjectFileInfo::getDwarfComdatSection(const char *Name, 1093 uint64_t Hash) const { 1094 switch (Ctx->getTargetTriple().getObjectFormat()) { 1095 case Triple::ELF: 1096 return Ctx->getELFSection(Name, ELF::SHT_PROGBITS, ELF::SHF_GROUP, 0, 1097 utostr(Hash), /*IsComdat=*/true); 1098 case Triple::Wasm: 1099 return Ctx->getWasmSection(Name, SectionKind::getMetadata(), 0, 1100 utostr(Hash), MCContext::GenericSectionID); 1101 case Triple::MachO: 1102 case Triple::COFF: 1103 case Triple::GOFF: 1104 case Triple::SPIRV: 1105 case Triple::XCOFF: 1106 case Triple::DXContainer: 1107 case Triple::UnknownObjectFormat: 1108 report_fatal_error("Cannot get DWARF comdat section for this object file " 1109 "format: not implemented."); 1110 break; 1111 } 1112 llvm_unreachable("Unknown ObjectFormatType"); 1113 } 1114 1115 MCSection * 1116 MCObjectFileInfo::getStackSizesSection(const MCSection &TextSec) const { 1117 if ((Ctx->getObjectFileType() != MCContext::IsELF) || 1118 Ctx->getTargetTriple().isPS4()) 1119 return StackSizesSection; 1120 1121 const MCSectionELF &ElfSec = static_cast<const MCSectionELF &>(TextSec); 1122 unsigned Flags = ELF::SHF_LINK_ORDER; 1123 StringRef GroupName; 1124 if (const MCSymbol *Group = ElfSec.getGroup()) { 1125 GroupName = Group->getName(); 1126 Flags |= ELF::SHF_GROUP; 1127 } 1128 1129 return Ctx->getELFSection(".stack_sizes", ELF::SHT_PROGBITS, Flags, 0, 1130 GroupName, true, ElfSec.getUniqueID(), 1131 cast<MCSymbolELF>(TextSec.getBeginSymbol())); 1132 } 1133 1134 MCSection * 1135 MCObjectFileInfo::getBBAddrMapSection(const MCSection &TextSec) const { 1136 if (Ctx->getObjectFileType() != MCContext::IsELF) 1137 return nullptr; 1138 1139 const MCSectionELF &ElfSec = static_cast<const MCSectionELF &>(TextSec); 1140 unsigned Flags = ELF::SHF_LINK_ORDER; 1141 StringRef GroupName; 1142 if (const MCSymbol *Group = ElfSec.getGroup()) { 1143 GroupName = Group->getName(); 1144 Flags |= ELF::SHF_GROUP; 1145 } 1146 1147 // Use the text section's begin symbol and unique ID to create a separate 1148 // .llvm_bb_addr_map section associated with every unique text section. 1149 return Ctx->getELFSection(".llvm_bb_addr_map", ELF::SHT_LLVM_BB_ADDR_MAP, 1150 Flags, 0, GroupName, true, ElfSec.getUniqueID(), 1151 cast<MCSymbolELF>(TextSec.getBeginSymbol())); 1152 } 1153 1154 MCSection * 1155 MCObjectFileInfo::getKCFITrapSection(const MCSection &TextSec) const { 1156 if (Ctx->getObjectFileType() != MCContext::IsELF) 1157 return nullptr; 1158 1159 const MCSectionELF &ElfSec = static_cast<const MCSectionELF &>(TextSec); 1160 unsigned Flags = ELF::SHF_LINK_ORDER | ELF::SHF_ALLOC; 1161 StringRef GroupName; 1162 if (const MCSymbol *Group = ElfSec.getGroup()) { 1163 GroupName = Group->getName(); 1164 Flags |= ELF::SHF_GROUP; 1165 } 1166 1167 return Ctx->getELFSection(".kcfi_traps", ELF::SHT_PROGBITS, Flags, 0, 1168 GroupName, 1169 /*IsComdat=*/true, ElfSec.getUniqueID(), 1170 cast<MCSymbolELF>(TextSec.getBeginSymbol())); 1171 } 1172 1173 MCSection * 1174 MCObjectFileInfo::getPseudoProbeSection(const MCSection &TextSec) const { 1175 if (Ctx->getObjectFileType() != MCContext::IsELF) 1176 return PseudoProbeSection; 1177 1178 const auto &ElfSec = static_cast<const MCSectionELF &>(TextSec); 1179 unsigned Flags = ELF::SHF_LINK_ORDER; 1180 StringRef GroupName; 1181 if (const MCSymbol *Group = ElfSec.getGroup()) { 1182 GroupName = Group->getName(); 1183 Flags |= ELF::SHF_GROUP; 1184 } 1185 1186 return Ctx->getELFSection(PseudoProbeSection->getName(), ELF::SHT_PROGBITS, 1187 Flags, 0, GroupName, true, ElfSec.getUniqueID(), 1188 cast<MCSymbolELF>(TextSec.getBeginSymbol())); 1189 } 1190 1191 MCSection * 1192 MCObjectFileInfo::getPseudoProbeDescSection(StringRef FuncName) const { 1193 if (Ctx->getObjectFileType() == MCContext::IsELF) { 1194 // Create a separate comdat group for each function's descriptor in order 1195 // for the linker to deduplicate. The duplication, must be from different 1196 // tranlation unit, can come from: 1197 // 1. Inline functions defined in header files; 1198 // 2. ThinLTO imported funcions; 1199 // 3. Weak-linkage definitions. 1200 // Use a concatenation of the section name and the function name as the 1201 // group name so that descriptor-only groups won't be folded with groups of 1202 // code. 1203 if (Ctx->getTargetTriple().supportsCOMDAT() && !FuncName.empty()) { 1204 auto *S = static_cast<MCSectionELF *>(PseudoProbeDescSection); 1205 auto Flags = S->getFlags() | ELF::SHF_GROUP; 1206 return Ctx->getELFSection(S->getName(), S->getType(), Flags, 1207 S->getEntrySize(), 1208 S->getName() + "_" + FuncName, 1209 /*IsComdat=*/true); 1210 } 1211 } 1212 return PseudoProbeDescSection; 1213 } 1214 1215 MCSection *MCObjectFileInfo::getLLVMStatsSection() const { 1216 return LLVMStatsSection; 1217 } 1218 1219 MCSection *MCObjectFileInfo::getPCSection(StringRef Name, 1220 const MCSection *TextSec) const { 1221 if (Ctx->getObjectFileType() != MCContext::IsELF) 1222 return nullptr; 1223 1224 // SHF_WRITE for relocations, and let user post-process data in-place. 1225 unsigned Flags = ELF::SHF_WRITE | ELF::SHF_ALLOC | ELF::SHF_LINK_ORDER; 1226 1227 if (!TextSec) 1228 TextSec = getTextSection(); 1229 1230 StringRef GroupName; 1231 const auto &ElfSec = static_cast<const MCSectionELF &>(*TextSec); 1232 if (const MCSymbol *Group = ElfSec.getGroup()) { 1233 GroupName = Group->getName(); 1234 Flags |= ELF::SHF_GROUP; 1235 } 1236 return Ctx->getELFSection(Name, ELF::SHT_PROGBITS, Flags, 0, GroupName, true, 1237 ElfSec.getUniqueID(), 1238 cast<MCSymbolELF>(TextSec->getBeginSymbol())); 1239 } 1240