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 // XROS always has it. 56 if (T.isXROS()) 57 return true; 58 59 return false; 60 } 61 62 void MCObjectFileInfo::initMachOMCObjectFileInfo(const Triple &T) { 63 // MachO 64 SupportsWeakOmittedEHFrame = false; 65 66 EHFrameSection = Ctx->getMachOSection( 67 "__TEXT", "__eh_frame", 68 MachO::S_COALESCED | MachO::S_ATTR_NO_TOC | 69 MachO::S_ATTR_STRIP_STATIC_SYMS | MachO::S_ATTR_LIVE_SUPPORT, 70 SectionKind::getReadOnly()); 71 72 if (T.isOSDarwin() && 73 (T.getArch() == Triple::aarch64 || T.getArch() == Triple::aarch64_32 || 74 T.isSimulatorEnvironment())) 75 SupportsCompactUnwindWithoutEHFrame = true; 76 77 switch (Ctx->emitDwarfUnwindInfo()) { 78 case EmitDwarfUnwindType::Always: 79 OmitDwarfIfHaveCompactUnwind = false; 80 break; 81 case EmitDwarfUnwindType::NoCompactUnwind: 82 OmitDwarfIfHaveCompactUnwind = true; 83 break; 84 case EmitDwarfUnwindType::Default: 85 OmitDwarfIfHaveCompactUnwind = 86 T.isWatchABI() || SupportsCompactUnwindWithoutEHFrame; 87 break; 88 } 89 90 FDECFIEncoding = dwarf::DW_EH_PE_pcrel; 91 92 TextSection // .text 93 = Ctx->getMachOSection("__TEXT", "__text", 94 MachO::S_ATTR_PURE_INSTRUCTIONS, 95 SectionKind::getText()); 96 DataSection // .data 97 = Ctx->getMachOSection("__DATA", "__data", 0, SectionKind::getData()); 98 99 // BSSSection might not be expected initialized on msvc. 100 BSSSection = nullptr; 101 102 TLSDataSection // .tdata 103 = Ctx->getMachOSection("__DATA", "__thread_data", 104 MachO::S_THREAD_LOCAL_REGULAR, 105 SectionKind::getData()); 106 TLSBSSSection // .tbss 107 = Ctx->getMachOSection("__DATA", "__thread_bss", 108 MachO::S_THREAD_LOCAL_ZEROFILL, 109 SectionKind::getThreadBSS()); 110 111 // TODO: Verify datarel below. 112 TLSTLVSection // .tlv 113 = Ctx->getMachOSection("__DATA", "__thread_vars", 114 MachO::S_THREAD_LOCAL_VARIABLES, 115 SectionKind::getData()); 116 117 TLSThreadInitSection = Ctx->getMachOSection( 118 "__DATA", "__thread_init", MachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS, 119 SectionKind::getData()); 120 121 CStringSection // .cstring 122 = Ctx->getMachOSection("__TEXT", "__cstring", 123 MachO::S_CSTRING_LITERALS, 124 SectionKind::getMergeable1ByteCString()); 125 UStringSection 126 = Ctx->getMachOSection("__TEXT","__ustring", 0, 127 SectionKind::getMergeable2ByteCString()); 128 FourByteConstantSection // .literal4 129 = Ctx->getMachOSection("__TEXT", "__literal4", 130 MachO::S_4BYTE_LITERALS, 131 SectionKind::getMergeableConst4()); 132 EightByteConstantSection // .literal8 133 = Ctx->getMachOSection("__TEXT", "__literal8", 134 MachO::S_8BYTE_LITERALS, 135 SectionKind::getMergeableConst8()); 136 137 SixteenByteConstantSection // .literal16 138 = Ctx->getMachOSection("__TEXT", "__literal16", 139 MachO::S_16BYTE_LITERALS, 140 SectionKind::getMergeableConst16()); 141 142 ReadOnlySection // .const 143 = Ctx->getMachOSection("__TEXT", "__const", 0, 144 SectionKind::getReadOnly()); 145 146 // If the target is not powerpc, map the coal sections to the non-coal 147 // sections. 148 // 149 // "__TEXT/__textcoal_nt" => section "__TEXT/__text" 150 // "__TEXT/__const_coal" => section "__TEXT/__const" 151 // "__DATA/__datacoal_nt" => section "__DATA/__data" 152 Triple::ArchType ArchTy = T.getArch(); 153 154 ConstDataSection // .const_data 155 = Ctx->getMachOSection("__DATA", "__const", 0, 156 SectionKind::getReadOnlyWithRel()); 157 158 if (ArchTy == Triple::ppc || ArchTy == Triple::ppc64) { 159 TextCoalSection 160 = Ctx->getMachOSection("__TEXT", "__textcoal_nt", 161 MachO::S_COALESCED | 162 MachO::S_ATTR_PURE_INSTRUCTIONS, 163 SectionKind::getText()); 164 ConstTextCoalSection 165 = Ctx->getMachOSection("__TEXT", "__const_coal", 166 MachO::S_COALESCED, 167 SectionKind::getReadOnly()); 168 DataCoalSection = Ctx->getMachOSection( 169 "__DATA", "__datacoal_nt", MachO::S_COALESCED, SectionKind::getData()); 170 ConstDataCoalSection = DataCoalSection; 171 } else { 172 TextCoalSection = TextSection; 173 ConstTextCoalSection = ReadOnlySection; 174 DataCoalSection = DataSection; 175 ConstDataCoalSection = ConstDataSection; 176 } 177 178 DataCommonSection 179 = Ctx->getMachOSection("__DATA","__common", 180 MachO::S_ZEROFILL, 181 SectionKind::getBSS()); 182 DataBSSSection 183 = Ctx->getMachOSection("__DATA","__bss", MachO::S_ZEROFILL, 184 SectionKind::getBSS()); 185 186 187 LazySymbolPointerSection 188 = Ctx->getMachOSection("__DATA", "__la_symbol_ptr", 189 MachO::S_LAZY_SYMBOL_POINTERS, 190 SectionKind::getMetadata()); 191 NonLazySymbolPointerSection 192 = Ctx->getMachOSection("__DATA", "__nl_symbol_ptr", 193 MachO::S_NON_LAZY_SYMBOL_POINTERS, 194 SectionKind::getMetadata()); 195 196 ThreadLocalPointerSection 197 = Ctx->getMachOSection("__DATA", "__thread_ptr", 198 MachO::S_THREAD_LOCAL_VARIABLE_POINTERS, 199 SectionKind::getMetadata()); 200 201 AddrSigSection = Ctx->getMachOSection("__DATA", "__llvm_addrsig", 0, 202 SectionKind::getData()); 203 204 // Exception Handling. 205 LSDASection = Ctx->getMachOSection("__TEXT", "__gcc_except_tab", 0, 206 SectionKind::getReadOnlyWithRel()); 207 208 COFFDebugSymbolsSection = nullptr; 209 COFFDebugTypesSection = nullptr; 210 COFFGlobalTypeHashesSection = nullptr; 211 212 if (useCompactUnwind(T)) { 213 CompactUnwindSection = 214 Ctx->getMachOSection("__LD", "__compact_unwind", MachO::S_ATTR_DEBUG, 215 SectionKind::getReadOnly()); 216 217 if (T.isX86()) 218 CompactUnwindDwarfEHFrameOnly = 0x04000000; // UNWIND_X86_64_MODE_DWARF 219 else if (T.getArch() == Triple::aarch64 || T.getArch() == Triple::aarch64_32) 220 CompactUnwindDwarfEHFrameOnly = 0x03000000; // UNWIND_ARM64_MODE_DWARF 221 else if (T.getArch() == Triple::arm || T.getArch() == Triple::thumb) 222 CompactUnwindDwarfEHFrameOnly = 0x04000000; // UNWIND_ARM_MODE_DWARF 223 } 224 225 // Debug Information. 226 DwarfDebugNamesSection = 227 Ctx->getMachOSection("__DWARF", "__debug_names", MachO::S_ATTR_DEBUG, 228 SectionKind::getMetadata(), "debug_names_begin"); 229 DwarfAccelNamesSection = 230 Ctx->getMachOSection("__DWARF", "__apple_names", MachO::S_ATTR_DEBUG, 231 SectionKind::getMetadata(), "names_begin"); 232 DwarfAccelObjCSection = 233 Ctx->getMachOSection("__DWARF", "__apple_objc", MachO::S_ATTR_DEBUG, 234 SectionKind::getMetadata(), "objc_begin"); 235 // 16 character section limit... 236 DwarfAccelNamespaceSection = 237 Ctx->getMachOSection("__DWARF", "__apple_namespac", MachO::S_ATTR_DEBUG, 238 SectionKind::getMetadata(), "namespac_begin"); 239 DwarfAccelTypesSection = 240 Ctx->getMachOSection("__DWARF", "__apple_types", MachO::S_ATTR_DEBUG, 241 SectionKind::getMetadata(), "types_begin"); 242 243 DwarfSwiftASTSection = 244 Ctx->getMachOSection("__DWARF", "__swift_ast", MachO::S_ATTR_DEBUG, 245 SectionKind::getMetadata()); 246 247 DwarfAbbrevSection = 248 Ctx->getMachOSection("__DWARF", "__debug_abbrev", MachO::S_ATTR_DEBUG, 249 SectionKind::getMetadata(), "section_abbrev"); 250 DwarfInfoSection = 251 Ctx->getMachOSection("__DWARF", "__debug_info", MachO::S_ATTR_DEBUG, 252 SectionKind::getMetadata(), "section_info"); 253 DwarfLineSection = 254 Ctx->getMachOSection("__DWARF", "__debug_line", MachO::S_ATTR_DEBUG, 255 SectionKind::getMetadata(), "section_line"); 256 DwarfLineStrSection = 257 Ctx->getMachOSection("__DWARF", "__debug_line_str", MachO::S_ATTR_DEBUG, 258 SectionKind::getMetadata(), "section_line_str"); 259 DwarfFrameSection = 260 Ctx->getMachOSection("__DWARF", "__debug_frame", MachO::S_ATTR_DEBUG, 261 SectionKind::getMetadata(), "section_frame"); 262 DwarfPubNamesSection = 263 Ctx->getMachOSection("__DWARF", "__debug_pubnames", MachO::S_ATTR_DEBUG, 264 SectionKind::getMetadata()); 265 DwarfPubTypesSection = 266 Ctx->getMachOSection("__DWARF", "__debug_pubtypes", MachO::S_ATTR_DEBUG, 267 SectionKind::getMetadata()); 268 DwarfGnuPubNamesSection = 269 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubn", MachO::S_ATTR_DEBUG, 270 SectionKind::getMetadata()); 271 DwarfGnuPubTypesSection = 272 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubt", MachO::S_ATTR_DEBUG, 273 SectionKind::getMetadata()); 274 DwarfStrSection = 275 Ctx->getMachOSection("__DWARF", "__debug_str", MachO::S_ATTR_DEBUG, 276 SectionKind::getMetadata(), "info_string"); 277 DwarfStrOffSection = 278 Ctx->getMachOSection("__DWARF", "__debug_str_offs", MachO::S_ATTR_DEBUG, 279 SectionKind::getMetadata(), "section_str_off"); 280 DwarfAddrSection = 281 Ctx->getMachOSection("__DWARF", "__debug_addr", MachO::S_ATTR_DEBUG, 282 SectionKind::getMetadata(), "section_info"); 283 DwarfLocSection = 284 Ctx->getMachOSection("__DWARF", "__debug_loc", MachO::S_ATTR_DEBUG, 285 SectionKind::getMetadata(), "section_debug_loc"); 286 DwarfLoclistsSection = 287 Ctx->getMachOSection("__DWARF", "__debug_loclists", MachO::S_ATTR_DEBUG, 288 SectionKind::getMetadata(), "section_debug_loc"); 289 290 DwarfARangesSection = 291 Ctx->getMachOSection("__DWARF", "__debug_aranges", MachO::S_ATTR_DEBUG, 292 SectionKind::getMetadata()); 293 DwarfRangesSection = 294 Ctx->getMachOSection("__DWARF", "__debug_ranges", MachO::S_ATTR_DEBUG, 295 SectionKind::getMetadata(), "debug_range"); 296 DwarfRnglistsSection = 297 Ctx->getMachOSection("__DWARF", "__debug_rnglists", MachO::S_ATTR_DEBUG, 298 SectionKind::getMetadata(), "debug_range"); 299 DwarfMacinfoSection = 300 Ctx->getMachOSection("__DWARF", "__debug_macinfo", MachO::S_ATTR_DEBUG, 301 SectionKind::getMetadata(), "debug_macinfo"); 302 DwarfMacroSection = 303 Ctx->getMachOSection("__DWARF", "__debug_macro", MachO::S_ATTR_DEBUG, 304 SectionKind::getMetadata(), "debug_macro"); 305 DwarfDebugInlineSection = 306 Ctx->getMachOSection("__DWARF", "__debug_inlined", MachO::S_ATTR_DEBUG, 307 SectionKind::getMetadata()); 308 DwarfCUIndexSection = 309 Ctx->getMachOSection("__DWARF", "__debug_cu_index", MachO::S_ATTR_DEBUG, 310 SectionKind::getMetadata()); 311 DwarfTUIndexSection = 312 Ctx->getMachOSection("__DWARF", "__debug_tu_index", MachO::S_ATTR_DEBUG, 313 SectionKind::getMetadata()); 314 StackMapSection = Ctx->getMachOSection("__LLVM_STACKMAPS", "__llvm_stackmaps", 315 0, SectionKind::getMetadata()); 316 317 FaultMapSection = Ctx->getMachOSection("__LLVM_FAULTMAPS", "__llvm_faultmaps", 318 0, SectionKind::getMetadata()); 319 320 RemarksSection = Ctx->getMachOSection( 321 "__LLVM", "__remarks", MachO::S_ATTR_DEBUG, SectionKind::getMetadata()); 322 323 // The architecture of dsymutil makes it very difficult to copy the Swift 324 // reflection metadata sections into the __TEXT segment, so dsymutil creates 325 // these sections in the __DWARF segment instead. 326 if (!Ctx->getSwift5ReflectionSegmentName().empty()) { 327 #define HANDLE_SWIFT_SECTION(KIND, MACHO, ELF, COFF) \ 328 Swift5ReflectionSections \ 329 [llvm::binaryformat::Swift5ReflectionSectionKind::KIND] = \ 330 Ctx->getMachOSection(Ctx->getSwift5ReflectionSegmentName().data(), \ 331 MACHO, 0, SectionKind::getMetadata()); 332 #include "llvm/BinaryFormat/Swift.def" 333 } 334 335 TLSExtraDataSection = TLSTLVSection; 336 } 337 338 void MCObjectFileInfo::initELFMCObjectFileInfo(const Triple &T, bool Large) { 339 switch (T.getArch()) { 340 case Triple::mips: 341 case Triple::mipsel: 342 case Triple::mips64: 343 case Triple::mips64el: 344 // We cannot use DW_EH_PE_sdata8 for the large PositionIndependent case 345 // since there is no R_MIPS_PC64 relocation (only a 32-bit version). 346 if (PositionIndependent && !Large) 347 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 348 else 349 FDECFIEncoding = Ctx->getAsmInfo()->getCodePointerSize() == 4 350 ? dwarf::DW_EH_PE_sdata4 351 : dwarf::DW_EH_PE_sdata8; 352 break; 353 case Triple::ppc64: 354 case Triple::ppc64le: 355 case Triple::aarch64: 356 case Triple::aarch64_be: 357 case Triple::x86_64: 358 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | 359 (Large ? dwarf::DW_EH_PE_sdata8 : dwarf::DW_EH_PE_sdata4); 360 break; 361 case Triple::bpfel: 362 case Triple::bpfeb: 363 FDECFIEncoding = dwarf::DW_EH_PE_sdata8; 364 break; 365 case Triple::hexagon: 366 FDECFIEncoding = 367 PositionIndependent ? dwarf::DW_EH_PE_pcrel : dwarf::DW_EH_PE_absptr; 368 break; 369 case Triple::xtensa: 370 FDECFIEncoding = dwarf::DW_EH_PE_sdata4; 371 break; 372 default: 373 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 374 break; 375 } 376 377 unsigned EHSectionType = T.getArch() == Triple::x86_64 378 ? ELF::SHT_X86_64_UNWIND 379 : ELF::SHT_PROGBITS; 380 381 // Solaris requires different flags for .eh_frame to seemingly every other 382 // platform. 383 unsigned EHSectionFlags = ELF::SHF_ALLOC; 384 if (T.isOSSolaris() && T.getArch() != Triple::x86_64) 385 EHSectionFlags |= ELF::SHF_WRITE; 386 387 // ELF 388 BSSSection = Ctx->getELFSection(".bss", ELF::SHT_NOBITS, 389 ELF::SHF_WRITE | ELF::SHF_ALLOC); 390 391 TextSection = Ctx->getELFSection(".text", ELF::SHT_PROGBITS, 392 ELF::SHF_EXECINSTR | ELF::SHF_ALLOC); 393 394 DataSection = Ctx->getELFSection(".data", ELF::SHT_PROGBITS, 395 ELF::SHF_WRITE | ELF::SHF_ALLOC); 396 397 ReadOnlySection = 398 Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); 399 400 TLSDataSection = 401 Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS, 402 ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE); 403 404 TLSBSSSection = Ctx->getELFSection( 405 ".tbss", ELF::SHT_NOBITS, ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE); 406 407 DataRelROSection = Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS, 408 ELF::SHF_ALLOC | ELF::SHF_WRITE); 409 410 MergeableConst4Section = 411 Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS, 412 ELF::SHF_ALLOC | ELF::SHF_MERGE, 4); 413 414 MergeableConst8Section = 415 Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS, 416 ELF::SHF_ALLOC | ELF::SHF_MERGE, 8); 417 418 MergeableConst16Section = 419 Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS, 420 ELF::SHF_ALLOC | ELF::SHF_MERGE, 16); 421 422 MergeableConst32Section = 423 Ctx->getELFSection(".rodata.cst32", ELF::SHT_PROGBITS, 424 ELF::SHF_ALLOC | ELF::SHF_MERGE, 32); 425 426 // Exception Handling Sections. 427 428 // FIXME: We're emitting LSDA info into a readonly section on ELF, even though 429 // it contains relocatable pointers. In PIC mode, this is probably a big 430 // runtime hit for C++ apps. Either the contents of the LSDA need to be 431 // adjusted or this should be a data section. 432 LSDASection = Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS, 433 ELF::SHF_ALLOC); 434 435 COFFDebugSymbolsSection = nullptr; 436 COFFDebugTypesSection = nullptr; 437 438 unsigned DebugSecType = ELF::SHT_PROGBITS; 439 440 // MIPS .debug_* sections should have SHT_MIPS_DWARF section type 441 // to distinguish among sections contain DWARF and ECOFF debug formats. 442 // Sections with ECOFF debug format are obsoleted and marked by SHT_PROGBITS. 443 if (T.isMIPS()) 444 DebugSecType = ELF::SHT_MIPS_DWARF; 445 446 // Debug Info Sections. 447 DwarfAbbrevSection = 448 Ctx->getELFSection(".debug_abbrev", DebugSecType, 0); 449 DwarfInfoSection = Ctx->getELFSection(".debug_info", DebugSecType, 0); 450 DwarfLineSection = Ctx->getELFSection(".debug_line", DebugSecType, 0); 451 DwarfLineStrSection = 452 Ctx->getELFSection(".debug_line_str", DebugSecType, 453 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1); 454 DwarfFrameSection = Ctx->getELFSection(".debug_frame", DebugSecType, 0); 455 DwarfPubNamesSection = 456 Ctx->getELFSection(".debug_pubnames", DebugSecType, 0); 457 DwarfPubTypesSection = 458 Ctx->getELFSection(".debug_pubtypes", DebugSecType, 0); 459 DwarfGnuPubNamesSection = 460 Ctx->getELFSection(".debug_gnu_pubnames", DebugSecType, 0); 461 DwarfGnuPubTypesSection = 462 Ctx->getELFSection(".debug_gnu_pubtypes", DebugSecType, 0); 463 DwarfStrSection = 464 Ctx->getELFSection(".debug_str", DebugSecType, 465 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1); 466 DwarfLocSection = Ctx->getELFSection(".debug_loc", DebugSecType, 0); 467 DwarfARangesSection = 468 Ctx->getELFSection(".debug_aranges", DebugSecType, 0); 469 DwarfRangesSection = 470 Ctx->getELFSection(".debug_ranges", DebugSecType, 0); 471 DwarfMacinfoSection = 472 Ctx->getELFSection(".debug_macinfo", DebugSecType, 0); 473 DwarfMacroSection = Ctx->getELFSection(".debug_macro", DebugSecType, 0); 474 475 // DWARF5 Experimental Debug Info 476 477 // Accelerator Tables 478 DwarfDebugNamesSection = 479 Ctx->getELFSection(".debug_names", ELF::SHT_PROGBITS, 0); 480 DwarfAccelNamesSection = 481 Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0); 482 DwarfAccelObjCSection = 483 Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0); 484 DwarfAccelNamespaceSection = 485 Ctx->getELFSection(".apple_namespaces", ELF::SHT_PROGBITS, 0); 486 DwarfAccelTypesSection = 487 Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0); 488 489 // String Offset and Address Sections 490 DwarfStrOffSection = 491 Ctx->getELFSection(".debug_str_offsets", DebugSecType, 0); 492 DwarfAddrSection = Ctx->getELFSection(".debug_addr", DebugSecType, 0); 493 DwarfRnglistsSection = Ctx->getELFSection(".debug_rnglists", DebugSecType, 0); 494 DwarfLoclistsSection = Ctx->getELFSection(".debug_loclists", DebugSecType, 0); 495 496 // Fission Sections 497 DwarfInfoDWOSection = 498 Ctx->getELFSection(".debug_info.dwo", DebugSecType, ELF::SHF_EXCLUDE); 499 DwarfTypesDWOSection = 500 Ctx->getELFSection(".debug_types.dwo", DebugSecType, ELF::SHF_EXCLUDE); 501 DwarfAbbrevDWOSection = 502 Ctx->getELFSection(".debug_abbrev.dwo", DebugSecType, ELF::SHF_EXCLUDE); 503 DwarfStrDWOSection = Ctx->getELFSection( 504 ".debug_str.dwo", DebugSecType, 505 ELF::SHF_MERGE | ELF::SHF_STRINGS | ELF::SHF_EXCLUDE, 1); 506 DwarfLineDWOSection = 507 Ctx->getELFSection(".debug_line.dwo", DebugSecType, ELF::SHF_EXCLUDE); 508 DwarfLocDWOSection = 509 Ctx->getELFSection(".debug_loc.dwo", DebugSecType, ELF::SHF_EXCLUDE); 510 DwarfStrOffDWOSection = Ctx->getELFSection(".debug_str_offsets.dwo", 511 DebugSecType, ELF::SHF_EXCLUDE); 512 DwarfRnglistsDWOSection = 513 Ctx->getELFSection(".debug_rnglists.dwo", DebugSecType, ELF::SHF_EXCLUDE); 514 DwarfMacinfoDWOSection = 515 Ctx->getELFSection(".debug_macinfo.dwo", DebugSecType, ELF::SHF_EXCLUDE); 516 DwarfMacroDWOSection = 517 Ctx->getELFSection(".debug_macro.dwo", DebugSecType, ELF::SHF_EXCLUDE); 518 519 DwarfLoclistsDWOSection = 520 Ctx->getELFSection(".debug_loclists.dwo", DebugSecType, ELF::SHF_EXCLUDE); 521 522 // DWP Sections 523 DwarfCUIndexSection = 524 Ctx->getELFSection(".debug_cu_index", DebugSecType, 0); 525 DwarfTUIndexSection = 526 Ctx->getELFSection(".debug_tu_index", DebugSecType, 0); 527 528 StackMapSection = 529 Ctx->getELFSection(".llvm_stackmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); 530 531 FaultMapSection = 532 Ctx->getELFSection(".llvm_faultmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); 533 534 EHFrameSection = 535 Ctx->getELFSection(".eh_frame", EHSectionType, EHSectionFlags); 536 537 StackSizesSection = Ctx->getELFSection(".stack_sizes", ELF::SHT_PROGBITS, 0); 538 539 PseudoProbeSection = Ctx->getELFSection(".pseudo_probe", DebugSecType, 0); 540 PseudoProbeDescSection = 541 Ctx->getELFSection(".pseudo_probe_desc", DebugSecType, 0); 542 543 LLVMStatsSection = Ctx->getELFSection(".llvm_stats", ELF::SHT_PROGBITS, 0); 544 } 545 546 void MCObjectFileInfo::initGOFFMCObjectFileInfo(const Triple &T) { 547 TextSection = 548 Ctx->getGOFFSection(".text", SectionKind::getText(), nullptr, nullptr); 549 BSSSection = 550 Ctx->getGOFFSection(".bss", SectionKind::getBSS(), nullptr, nullptr); 551 PPA1Section = 552 Ctx->getGOFFSection(".ppa1", SectionKind::getMetadata(), TextSection, 553 MCConstantExpr::create(GOFF::SK_PPA1, *Ctx)); 554 PPA2Section = 555 Ctx->getGOFFSection(".ppa2", SectionKind::getMetadata(), TextSection, 556 MCConstantExpr::create(GOFF::SK_PPA2, *Ctx)); 557 ADASection = 558 Ctx->getGOFFSection(".ada", SectionKind::getData(), nullptr, nullptr); 559 IDRLSection = 560 Ctx->getGOFFSection("B_IDRL", SectionKind::getData(), nullptr, nullptr); 561 } 562 563 void MCObjectFileInfo::initCOFFMCObjectFileInfo(const Triple &T) { 564 EHFrameSection = 565 Ctx->getCOFFSection(".eh_frame", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 566 COFF::IMAGE_SCN_MEM_READ, 567 SectionKind::getData()); 568 569 // Set the `IMAGE_SCN_MEM_16BIT` flag when compiling for thumb mode. This is 570 // used to indicate to the linker that the text segment contains thumb instructions 571 // and to set the ISA selection bit for calls accordingly. 572 const bool IsThumb = T.getArch() == Triple::thumb; 573 574 // COFF 575 BSSSection = Ctx->getCOFFSection( 576 ".bss", COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA | 577 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE, 578 SectionKind::getBSS()); 579 TextSection = Ctx->getCOFFSection( 580 ".text", 581 (IsThumb ? COFF::IMAGE_SCN_MEM_16BIT : (COFF::SectionCharacteristics)0) | 582 COFF::IMAGE_SCN_CNT_CODE | COFF::IMAGE_SCN_MEM_EXECUTE | 583 COFF::IMAGE_SCN_MEM_READ, 584 SectionKind::getText()); 585 DataSection = Ctx->getCOFFSection( 586 ".data", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ | 587 COFF::IMAGE_SCN_MEM_WRITE, 588 SectionKind::getData()); 589 ReadOnlySection = Ctx->getCOFFSection( 590 ".rdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, 591 SectionKind::getReadOnly()); 592 593 if (T.getArch() == Triple::x86_64 || T.getArch() == Triple::aarch64 || 594 T.getArch() == Triple::arm || T.getArch() == Triple::thumb) { 595 // On Windows with SEH, the LSDA is emitted into the .xdata section 596 LSDASection = nullptr; 597 } else { 598 LSDASection = Ctx->getCOFFSection(".gcc_except_table", 599 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 600 COFF::IMAGE_SCN_MEM_READ, 601 SectionKind::getReadOnly()); 602 } 603 604 // Debug info. 605 COFFDebugSymbolsSection = 606 Ctx->getCOFFSection(".debug$S", (COFF::IMAGE_SCN_MEM_DISCARDABLE | 607 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 608 COFF::IMAGE_SCN_MEM_READ), 609 SectionKind::getMetadata()); 610 COFFDebugTypesSection = 611 Ctx->getCOFFSection(".debug$T", (COFF::IMAGE_SCN_MEM_DISCARDABLE | 612 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 613 COFF::IMAGE_SCN_MEM_READ), 614 SectionKind::getMetadata()); 615 COFFGlobalTypeHashesSection = Ctx->getCOFFSection( 616 ".debug$H", 617 (COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 618 COFF::IMAGE_SCN_MEM_READ), 619 SectionKind::getMetadata()); 620 621 DwarfAbbrevSection = Ctx->getCOFFSection( 622 ".debug_abbrev", 623 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 624 COFF::IMAGE_SCN_MEM_READ, 625 SectionKind::getMetadata(), "section_abbrev"); 626 DwarfInfoSection = Ctx->getCOFFSection( 627 ".debug_info", 628 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 629 COFF::IMAGE_SCN_MEM_READ, 630 SectionKind::getMetadata(), "section_info"); 631 DwarfLineSection = Ctx->getCOFFSection( 632 ".debug_line", 633 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 634 COFF::IMAGE_SCN_MEM_READ, 635 SectionKind::getMetadata(), "section_line"); 636 DwarfLineStrSection = Ctx->getCOFFSection( 637 ".debug_line_str", 638 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 639 COFF::IMAGE_SCN_MEM_READ, 640 SectionKind::getMetadata(), "section_line_str"); 641 DwarfFrameSection = Ctx->getCOFFSection( 642 ".debug_frame", 643 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 644 COFF::IMAGE_SCN_MEM_READ, 645 SectionKind::getMetadata()); 646 DwarfPubNamesSection = Ctx->getCOFFSection( 647 ".debug_pubnames", 648 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 649 COFF::IMAGE_SCN_MEM_READ, 650 SectionKind::getMetadata()); 651 DwarfPubTypesSection = Ctx->getCOFFSection( 652 ".debug_pubtypes", 653 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 654 COFF::IMAGE_SCN_MEM_READ, 655 SectionKind::getMetadata()); 656 DwarfGnuPubNamesSection = Ctx->getCOFFSection( 657 ".debug_gnu_pubnames", 658 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 659 COFF::IMAGE_SCN_MEM_READ, 660 SectionKind::getMetadata()); 661 DwarfGnuPubTypesSection = Ctx->getCOFFSection( 662 ".debug_gnu_pubtypes", 663 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 664 COFF::IMAGE_SCN_MEM_READ, 665 SectionKind::getMetadata()); 666 DwarfStrSection = Ctx->getCOFFSection( 667 ".debug_str", 668 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 669 COFF::IMAGE_SCN_MEM_READ, 670 SectionKind::getMetadata(), "info_string"); 671 DwarfStrOffSection = Ctx->getCOFFSection( 672 ".debug_str_offsets", 673 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 674 COFF::IMAGE_SCN_MEM_READ, 675 SectionKind::getMetadata(), "section_str_off"); 676 DwarfLocSection = Ctx->getCOFFSection( 677 ".debug_loc", 678 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 679 COFF::IMAGE_SCN_MEM_READ, 680 SectionKind::getMetadata(), "section_debug_loc"); 681 DwarfLoclistsSection = Ctx->getCOFFSection( 682 ".debug_loclists", 683 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 684 COFF::IMAGE_SCN_MEM_READ, 685 SectionKind::getMetadata(), "section_debug_loclists"); 686 DwarfARangesSection = Ctx->getCOFFSection( 687 ".debug_aranges", 688 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 689 COFF::IMAGE_SCN_MEM_READ, 690 SectionKind::getMetadata()); 691 DwarfRangesSection = Ctx->getCOFFSection( 692 ".debug_ranges", 693 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 694 COFF::IMAGE_SCN_MEM_READ, 695 SectionKind::getMetadata(), "debug_range"); 696 DwarfRnglistsSection = Ctx->getCOFFSection( 697 ".debug_rnglists", 698 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 699 COFF::IMAGE_SCN_MEM_READ, 700 SectionKind::getMetadata(), "debug_rnglists"); 701 DwarfMacinfoSection = Ctx->getCOFFSection( 702 ".debug_macinfo", 703 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 704 COFF::IMAGE_SCN_MEM_READ, 705 SectionKind::getMetadata(), "debug_macinfo"); 706 DwarfMacroSection = Ctx->getCOFFSection( 707 ".debug_macro", 708 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 709 COFF::IMAGE_SCN_MEM_READ, 710 SectionKind::getMetadata(), "debug_macro"); 711 DwarfMacinfoDWOSection = Ctx->getCOFFSection( 712 ".debug_macinfo.dwo", 713 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 714 COFF::IMAGE_SCN_MEM_READ, 715 SectionKind::getMetadata(), "debug_macinfo.dwo"); 716 DwarfMacroDWOSection = Ctx->getCOFFSection( 717 ".debug_macro.dwo", 718 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 719 COFF::IMAGE_SCN_MEM_READ, 720 SectionKind::getMetadata(), "debug_macro.dwo"); 721 DwarfInfoDWOSection = Ctx->getCOFFSection( 722 ".debug_info.dwo", 723 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 724 COFF::IMAGE_SCN_MEM_READ, 725 SectionKind::getMetadata(), "section_info_dwo"); 726 DwarfTypesDWOSection = Ctx->getCOFFSection( 727 ".debug_types.dwo", 728 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 729 COFF::IMAGE_SCN_MEM_READ, 730 SectionKind::getMetadata(), "section_types_dwo"); 731 DwarfAbbrevDWOSection = Ctx->getCOFFSection( 732 ".debug_abbrev.dwo", 733 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 734 COFF::IMAGE_SCN_MEM_READ, 735 SectionKind::getMetadata(), "section_abbrev_dwo"); 736 DwarfStrDWOSection = Ctx->getCOFFSection( 737 ".debug_str.dwo", 738 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 739 COFF::IMAGE_SCN_MEM_READ, 740 SectionKind::getMetadata(), "skel_string"); 741 DwarfLineDWOSection = Ctx->getCOFFSection( 742 ".debug_line.dwo", 743 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 744 COFF::IMAGE_SCN_MEM_READ, 745 SectionKind::getMetadata()); 746 DwarfLocDWOSection = Ctx->getCOFFSection( 747 ".debug_loc.dwo", 748 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 749 COFF::IMAGE_SCN_MEM_READ, 750 SectionKind::getMetadata(), "skel_loc"); 751 DwarfStrOffDWOSection = Ctx->getCOFFSection( 752 ".debug_str_offsets.dwo", 753 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 754 COFF::IMAGE_SCN_MEM_READ, 755 SectionKind::getMetadata(), "section_str_off_dwo"); 756 DwarfAddrSection = Ctx->getCOFFSection( 757 ".debug_addr", 758 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 759 COFF::IMAGE_SCN_MEM_READ, 760 SectionKind::getMetadata(), "addr_sec"); 761 DwarfCUIndexSection = Ctx->getCOFFSection( 762 ".debug_cu_index", 763 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 764 COFF::IMAGE_SCN_MEM_READ, 765 SectionKind::getMetadata()); 766 DwarfTUIndexSection = Ctx->getCOFFSection( 767 ".debug_tu_index", 768 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 769 COFF::IMAGE_SCN_MEM_READ, 770 SectionKind::getMetadata()); 771 DwarfDebugNamesSection = Ctx->getCOFFSection( 772 ".debug_names", 773 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 774 COFF::IMAGE_SCN_MEM_READ, 775 SectionKind::getMetadata(), "debug_names_begin"); 776 DwarfAccelNamesSection = Ctx->getCOFFSection( 777 ".apple_names", 778 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 779 COFF::IMAGE_SCN_MEM_READ, 780 SectionKind::getMetadata(), "names_begin"); 781 DwarfAccelNamespaceSection = Ctx->getCOFFSection( 782 ".apple_namespaces", 783 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 784 COFF::IMAGE_SCN_MEM_READ, 785 SectionKind::getMetadata(), "namespac_begin"); 786 DwarfAccelTypesSection = Ctx->getCOFFSection( 787 ".apple_types", 788 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 789 COFF::IMAGE_SCN_MEM_READ, 790 SectionKind::getMetadata(), "types_begin"); 791 DwarfAccelObjCSection = Ctx->getCOFFSection( 792 ".apple_objc", 793 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 794 COFF::IMAGE_SCN_MEM_READ, 795 SectionKind::getMetadata(), "objc_begin"); 796 797 DrectveSection = Ctx->getCOFFSection( 798 ".drectve", COFF::IMAGE_SCN_LNK_INFO | COFF::IMAGE_SCN_LNK_REMOVE, 799 SectionKind::getMetadata()); 800 801 PDataSection = Ctx->getCOFFSection( 802 ".pdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, 803 SectionKind::getData()); 804 805 XDataSection = Ctx->getCOFFSection( 806 ".xdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, 807 SectionKind::getData()); 808 809 SXDataSection = Ctx->getCOFFSection(".sxdata", COFF::IMAGE_SCN_LNK_INFO, 810 SectionKind::getMetadata()); 811 812 GEHContSection = Ctx->getCOFFSection(".gehcont$y", 813 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 814 COFF::IMAGE_SCN_MEM_READ, 815 SectionKind::getMetadata()); 816 817 GFIDsSection = Ctx->getCOFFSection(".gfids$y", 818 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 819 COFF::IMAGE_SCN_MEM_READ, 820 SectionKind::getMetadata()); 821 822 GIATsSection = Ctx->getCOFFSection(".giats$y", 823 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 824 COFF::IMAGE_SCN_MEM_READ, 825 SectionKind::getMetadata()); 826 827 GLJMPSection = Ctx->getCOFFSection(".gljmp$y", 828 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 829 COFF::IMAGE_SCN_MEM_READ, 830 SectionKind::getMetadata()); 831 832 TLSDataSection = Ctx->getCOFFSection( 833 ".tls$", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ | 834 COFF::IMAGE_SCN_MEM_WRITE, 835 SectionKind::getData()); 836 837 StackMapSection = Ctx->getCOFFSection(".llvm_stackmaps", 838 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 839 COFF::IMAGE_SCN_MEM_READ, 840 SectionKind::getReadOnly()); 841 } 842 843 void MCObjectFileInfo::initSPIRVMCObjectFileInfo(const Triple &T) { 844 // Put everything in a single binary section. 845 TextSection = Ctx->getSPIRVSection(); 846 } 847 848 void MCObjectFileInfo::initWasmMCObjectFileInfo(const Triple &T) { 849 TextSection = Ctx->getWasmSection(".text", SectionKind::getText()); 850 DataSection = Ctx->getWasmSection(".data", SectionKind::getData()); 851 852 DwarfLineSection = 853 Ctx->getWasmSection(".debug_line", SectionKind::getMetadata()); 854 DwarfLineStrSection = 855 Ctx->getWasmSection(".debug_line_str", SectionKind::getMetadata(), 856 wasm::WASM_SEG_FLAG_STRINGS); 857 DwarfStrSection = Ctx->getWasmSection( 858 ".debug_str", SectionKind::getMetadata(), wasm::WASM_SEG_FLAG_STRINGS); 859 DwarfLocSection = 860 Ctx->getWasmSection(".debug_loc", SectionKind::getMetadata()); 861 DwarfAbbrevSection = 862 Ctx->getWasmSection(".debug_abbrev", SectionKind::getMetadata()); 863 DwarfARangesSection = Ctx->getWasmSection(".debug_aranges", SectionKind::getMetadata()); 864 DwarfRangesSection = 865 Ctx->getWasmSection(".debug_ranges", SectionKind::getMetadata()); 866 DwarfMacinfoSection = 867 Ctx->getWasmSection(".debug_macinfo", SectionKind::getMetadata()); 868 DwarfMacroSection = 869 Ctx->getWasmSection(".debug_macro", SectionKind::getMetadata()); 870 DwarfCUIndexSection = Ctx->getWasmSection(".debug_cu_index", SectionKind::getMetadata()); 871 DwarfTUIndexSection = Ctx->getWasmSection(".debug_tu_index", SectionKind::getMetadata()); 872 DwarfInfoSection = 873 Ctx->getWasmSection(".debug_info", SectionKind::getMetadata()); 874 DwarfFrameSection = Ctx->getWasmSection(".debug_frame", SectionKind::getMetadata()); 875 DwarfPubNamesSection = Ctx->getWasmSection(".debug_pubnames", SectionKind::getMetadata()); 876 DwarfPubTypesSection = Ctx->getWasmSection(".debug_pubtypes", SectionKind::getMetadata()); 877 DwarfGnuPubNamesSection = 878 Ctx->getWasmSection(".debug_gnu_pubnames", SectionKind::getMetadata()); 879 DwarfGnuPubTypesSection = 880 Ctx->getWasmSection(".debug_gnu_pubtypes", SectionKind::getMetadata()); 881 882 DwarfDebugNamesSection = 883 Ctx->getWasmSection(".debug_names", SectionKind::getMetadata()); 884 DwarfStrOffSection = 885 Ctx->getWasmSection(".debug_str_offsets", SectionKind::getMetadata()); 886 DwarfAddrSection = 887 Ctx->getWasmSection(".debug_addr", SectionKind::getMetadata()); 888 DwarfRnglistsSection = 889 Ctx->getWasmSection(".debug_rnglists", SectionKind::getMetadata()); 890 DwarfLoclistsSection = 891 Ctx->getWasmSection(".debug_loclists", SectionKind::getMetadata()); 892 893 // Fission Sections 894 DwarfInfoDWOSection = 895 Ctx->getWasmSection(".debug_info.dwo", SectionKind::getMetadata()); 896 DwarfTypesDWOSection = 897 Ctx->getWasmSection(".debug_types.dwo", SectionKind::getMetadata()); 898 DwarfAbbrevDWOSection = 899 Ctx->getWasmSection(".debug_abbrev.dwo", SectionKind::getMetadata()); 900 DwarfStrDWOSection = 901 Ctx->getWasmSection(".debug_str.dwo", SectionKind::getMetadata(), 902 wasm::WASM_SEG_FLAG_STRINGS); 903 DwarfLineDWOSection = 904 Ctx->getWasmSection(".debug_line.dwo", SectionKind::getMetadata()); 905 DwarfLocDWOSection = 906 Ctx->getWasmSection(".debug_loc.dwo", SectionKind::getMetadata()); 907 DwarfStrOffDWOSection = 908 Ctx->getWasmSection(".debug_str_offsets.dwo", SectionKind::getMetadata()); 909 DwarfRnglistsDWOSection = 910 Ctx->getWasmSection(".debug_rnglists.dwo", SectionKind::getMetadata()); 911 DwarfMacinfoDWOSection = 912 Ctx->getWasmSection(".debug_macinfo.dwo", SectionKind::getMetadata()); 913 DwarfMacroDWOSection = 914 Ctx->getWasmSection(".debug_macro.dwo", SectionKind::getMetadata()); 915 916 DwarfLoclistsDWOSection = 917 Ctx->getWasmSection(".debug_loclists.dwo", SectionKind::getMetadata()); 918 919 // DWP Sections 920 DwarfCUIndexSection = 921 Ctx->getWasmSection(".debug_cu_index", SectionKind::getMetadata()); 922 DwarfTUIndexSection = 923 Ctx->getWasmSection(".debug_tu_index", SectionKind::getMetadata()); 924 925 // Wasm use data section for LSDA. 926 // TODO Consider putting each function's exception table in a separate 927 // section, as in -function-sections, to facilitate lld's --gc-section. 928 LSDASection = Ctx->getWasmSection(".rodata.gcc_except_table", 929 SectionKind::getReadOnlyWithRel()); 930 931 // TODO: Define more sections. 932 } 933 934 void MCObjectFileInfo::initXCOFFMCObjectFileInfo(const Triple &T) { 935 // The default csect for program code. Functions without a specified section 936 // get placed into this csect. The choice of csect name is not a property of 937 // the ABI or object file format, but various tools rely on the section 938 // name being empty (considering named symbols to be "user symbol names"). 939 TextSection = Ctx->getXCOFFSection( 940 "..text..", // Use a non-null name to work around an AIX assembler bug... 941 SectionKind::getText(), 942 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_PR, XCOFF::XTY_SD), 943 /* MultiSymbolsAllowed*/ true); 944 945 // ... but use a null name when generating the symbol table. 946 MCSectionXCOFF *TS = static_cast<MCSectionXCOFF *>(TextSection); 947 TS->getQualNameSymbol()->setSymbolTableName(""); 948 TS->setSymbolTableName(""); 949 950 DataSection = Ctx->getXCOFFSection( 951 ".data", SectionKind::getData(), 952 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_RW, XCOFF::XTY_SD), 953 /* MultiSymbolsAllowed*/ true); 954 955 ReadOnlySection = Ctx->getXCOFFSection( 956 ".rodata", SectionKind::getReadOnly(), 957 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_RO, XCOFF::XTY_SD), 958 /* MultiSymbolsAllowed*/ true); 959 ReadOnlySection->setAlignment(Align(4)); 960 961 ReadOnly8Section = Ctx->getXCOFFSection( 962 ".rodata.8", SectionKind::getReadOnly(), 963 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_RO, XCOFF::XTY_SD), 964 /* MultiSymbolsAllowed*/ true); 965 ReadOnly8Section->setAlignment(Align(8)); 966 967 ReadOnly16Section = Ctx->getXCOFFSection( 968 ".rodata.16", SectionKind::getReadOnly(), 969 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_RO, XCOFF::XTY_SD), 970 /* MultiSymbolsAllowed*/ true); 971 ReadOnly16Section->setAlignment(Align(16)); 972 973 TLSDataSection = Ctx->getXCOFFSection( 974 ".tdata", SectionKind::getThreadData(), 975 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_TL, XCOFF::XTY_SD), 976 /* MultiSymbolsAllowed*/ true); 977 978 TOCBaseSection = Ctx->getXCOFFSection( 979 "TOC", SectionKind::getData(), 980 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_TC0, 981 XCOFF::XTY_SD)); 982 983 // The TOC-base always has 0 size, but 4 byte alignment. 984 TOCBaseSection->setAlignment(Align(4)); 985 986 LSDASection = Ctx->getXCOFFSection( 987 ".gcc_except_table", SectionKind::getReadOnly(), 988 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_RO, 989 XCOFF::XTY_SD)); 990 991 CompactUnwindSection = Ctx->getXCOFFSection( 992 ".eh_info_table", SectionKind::getData(), 993 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_RW, 994 XCOFF::XTY_SD)); 995 996 // DWARF sections for XCOFF are not csects. They are special STYP_DWARF 997 // sections, and the individual DWARF sections are distinguished by their 998 // section subtype. 999 DwarfAbbrevSection = Ctx->getXCOFFSection( 1000 ".dwabrev", SectionKind::getMetadata(), 1001 /* CsectProperties */ std::nullopt, 1002 /* MultiSymbolsAllowed */ true, ".dwabrev", XCOFF::SSUBTYP_DWABREV); 1003 1004 DwarfInfoSection = Ctx->getXCOFFSection( 1005 ".dwinfo", SectionKind::getMetadata(), /* CsectProperties */ std::nullopt, 1006 /* MultiSymbolsAllowed */ true, ".dwinfo", XCOFF::SSUBTYP_DWINFO); 1007 1008 DwarfLineSection = Ctx->getXCOFFSection( 1009 ".dwline", SectionKind::getMetadata(), /* CsectProperties */ std::nullopt, 1010 /* MultiSymbolsAllowed */ true, ".dwline", XCOFF::SSUBTYP_DWLINE); 1011 1012 DwarfFrameSection = Ctx->getXCOFFSection( 1013 ".dwframe", SectionKind::getMetadata(), 1014 /* CsectProperties */ std::nullopt, 1015 /* MultiSymbolsAllowed */ true, ".dwframe", XCOFF::SSUBTYP_DWFRAME); 1016 1017 DwarfPubNamesSection = Ctx->getXCOFFSection( 1018 ".dwpbnms", SectionKind::getMetadata(), 1019 /* CsectProperties */ std::nullopt, 1020 /* MultiSymbolsAllowed */ true, ".dwpbnms", XCOFF::SSUBTYP_DWPBNMS); 1021 1022 DwarfPubTypesSection = Ctx->getXCOFFSection( 1023 ".dwpbtyp", SectionKind::getMetadata(), 1024 /* CsectProperties */ std::nullopt, 1025 /* MultiSymbolsAllowed */ true, ".dwpbtyp", XCOFF::SSUBTYP_DWPBTYP); 1026 1027 DwarfStrSection = Ctx->getXCOFFSection( 1028 ".dwstr", SectionKind::getMetadata(), /* CsectProperties */ std::nullopt, 1029 /* MultiSymbolsAllowed */ true, ".dwstr", XCOFF::SSUBTYP_DWSTR); 1030 1031 DwarfLocSection = Ctx->getXCOFFSection( 1032 ".dwloc", SectionKind::getMetadata(), /* CsectProperties */ std::nullopt, 1033 /* MultiSymbolsAllowed */ true, ".dwloc", XCOFF::SSUBTYP_DWLOC); 1034 1035 DwarfARangesSection = Ctx->getXCOFFSection( 1036 ".dwarnge", SectionKind::getMetadata(), 1037 /* CsectProperties */ std::nullopt, 1038 /* MultiSymbolsAllowed */ true, ".dwarnge", XCOFF::SSUBTYP_DWARNGE); 1039 1040 DwarfRangesSection = Ctx->getXCOFFSection( 1041 ".dwrnges", SectionKind::getMetadata(), 1042 /* CsectProperties */ std::nullopt, 1043 /* MultiSymbolsAllowed */ true, ".dwrnges", XCOFF::SSUBTYP_DWRNGES); 1044 1045 DwarfMacinfoSection = Ctx->getXCOFFSection( 1046 ".dwmac", SectionKind::getMetadata(), /* CsectProperties */ std::nullopt, 1047 /* MultiSymbolsAllowed */ true, ".dwmac", XCOFF::SSUBTYP_DWMAC); 1048 } 1049 1050 void MCObjectFileInfo::initDXContainerObjectFileInfo(const Triple &T) { 1051 // At the moment the DXBC section should end up empty. 1052 TextSection = Ctx->getDXContainerSection("DXBC", SectionKind::getText()); 1053 } 1054 1055 MCObjectFileInfo::~MCObjectFileInfo() = default; 1056 1057 void MCObjectFileInfo::initMCObjectFileInfo(MCContext &MCCtx, bool PIC, 1058 bool LargeCodeModel) { 1059 PositionIndependent = PIC; 1060 Ctx = &MCCtx; 1061 1062 // Common. 1063 SupportsWeakOmittedEHFrame = true; 1064 SupportsCompactUnwindWithoutEHFrame = false; 1065 OmitDwarfIfHaveCompactUnwind = false; 1066 1067 FDECFIEncoding = dwarf::DW_EH_PE_absptr; 1068 1069 CompactUnwindDwarfEHFrameOnly = 0; 1070 1071 EHFrameSection = nullptr; // Created on demand. 1072 CompactUnwindSection = nullptr; // Used only by selected targets. 1073 DwarfAccelNamesSection = nullptr; // Used only by selected targets. 1074 DwarfAccelObjCSection = nullptr; // Used only by selected targets. 1075 DwarfAccelNamespaceSection = nullptr; // Used only by selected targets. 1076 DwarfAccelTypesSection = nullptr; // Used only by selected targets. 1077 1078 Triple TheTriple = Ctx->getTargetTriple(); 1079 switch (Ctx->getObjectFileType()) { 1080 case MCContext::IsMachO: 1081 initMachOMCObjectFileInfo(TheTriple); 1082 break; 1083 case MCContext::IsCOFF: 1084 initCOFFMCObjectFileInfo(TheTriple); 1085 break; 1086 case MCContext::IsELF: 1087 initELFMCObjectFileInfo(TheTriple, LargeCodeModel); 1088 break; 1089 case MCContext::IsGOFF: 1090 initGOFFMCObjectFileInfo(TheTriple); 1091 break; 1092 case MCContext::IsSPIRV: 1093 initSPIRVMCObjectFileInfo(TheTriple); 1094 break; 1095 case MCContext::IsWasm: 1096 initWasmMCObjectFileInfo(TheTriple); 1097 break; 1098 case MCContext::IsXCOFF: 1099 initXCOFFMCObjectFileInfo(TheTriple); 1100 break; 1101 case MCContext::IsDXContainer: 1102 initDXContainerObjectFileInfo(TheTriple); 1103 break; 1104 } 1105 } 1106 1107 MCSection *MCObjectFileInfo::getDwarfComdatSection(const char *Name, 1108 uint64_t Hash) const { 1109 switch (Ctx->getTargetTriple().getObjectFormat()) { 1110 case Triple::ELF: 1111 return Ctx->getELFSection(Name, ELF::SHT_PROGBITS, ELF::SHF_GROUP, 0, 1112 utostr(Hash), /*IsComdat=*/true); 1113 case Triple::Wasm: 1114 return Ctx->getWasmSection(Name, SectionKind::getMetadata(), 0, 1115 utostr(Hash), MCContext::GenericSectionID); 1116 case Triple::MachO: 1117 case Triple::COFF: 1118 case Triple::GOFF: 1119 case Triple::SPIRV: 1120 case Triple::XCOFF: 1121 case Triple::DXContainer: 1122 case Triple::UnknownObjectFormat: 1123 report_fatal_error("Cannot get DWARF comdat section for this object file " 1124 "format: not implemented."); 1125 break; 1126 } 1127 llvm_unreachable("Unknown ObjectFormatType"); 1128 } 1129 1130 MCSection * 1131 MCObjectFileInfo::getStackSizesSection(const MCSection &TextSec) const { 1132 if ((Ctx->getObjectFileType() != MCContext::IsELF) || 1133 Ctx->getTargetTriple().isPS4()) 1134 return StackSizesSection; 1135 1136 const MCSectionELF &ElfSec = static_cast<const MCSectionELF &>(TextSec); 1137 unsigned Flags = ELF::SHF_LINK_ORDER; 1138 StringRef GroupName; 1139 if (const MCSymbol *Group = ElfSec.getGroup()) { 1140 GroupName = Group->getName(); 1141 Flags |= ELF::SHF_GROUP; 1142 } 1143 1144 return Ctx->getELFSection(".stack_sizes", ELF::SHT_PROGBITS, Flags, 0, 1145 GroupName, true, ElfSec.getUniqueID(), 1146 cast<MCSymbolELF>(TextSec.getBeginSymbol())); 1147 } 1148 1149 MCSection * 1150 MCObjectFileInfo::getBBAddrMapSection(const MCSection &TextSec) const { 1151 if (Ctx->getObjectFileType() != MCContext::IsELF) 1152 return nullptr; 1153 1154 const MCSectionELF &ElfSec = static_cast<const MCSectionELF &>(TextSec); 1155 unsigned Flags = ELF::SHF_LINK_ORDER; 1156 StringRef GroupName; 1157 if (const MCSymbol *Group = ElfSec.getGroup()) { 1158 GroupName = Group->getName(); 1159 Flags |= ELF::SHF_GROUP; 1160 } 1161 1162 // Use the text section's begin symbol and unique ID to create a separate 1163 // .llvm_bb_addr_map section associated with every unique text section. 1164 return Ctx->getELFSection(".llvm_bb_addr_map", ELF::SHT_LLVM_BB_ADDR_MAP, 1165 Flags, 0, GroupName, true, ElfSec.getUniqueID(), 1166 cast<MCSymbolELF>(TextSec.getBeginSymbol())); 1167 } 1168 1169 MCSection * 1170 MCObjectFileInfo::getKCFITrapSection(const MCSection &TextSec) const { 1171 if (Ctx->getObjectFileType() != MCContext::IsELF) 1172 return nullptr; 1173 1174 const MCSectionELF &ElfSec = static_cast<const MCSectionELF &>(TextSec); 1175 unsigned Flags = ELF::SHF_LINK_ORDER | ELF::SHF_ALLOC; 1176 StringRef GroupName; 1177 if (const MCSymbol *Group = ElfSec.getGroup()) { 1178 GroupName = Group->getName(); 1179 Flags |= ELF::SHF_GROUP; 1180 } 1181 1182 return Ctx->getELFSection(".kcfi_traps", ELF::SHT_PROGBITS, Flags, 0, 1183 GroupName, 1184 /*IsComdat=*/true, ElfSec.getUniqueID(), 1185 cast<MCSymbolELF>(TextSec.getBeginSymbol())); 1186 } 1187 1188 MCSection * 1189 MCObjectFileInfo::getPseudoProbeSection(const MCSection &TextSec) const { 1190 if (Ctx->getObjectFileType() != MCContext::IsELF) 1191 return PseudoProbeSection; 1192 1193 const auto &ElfSec = static_cast<const MCSectionELF &>(TextSec); 1194 unsigned Flags = ELF::SHF_LINK_ORDER; 1195 StringRef GroupName; 1196 if (const MCSymbol *Group = ElfSec.getGroup()) { 1197 GroupName = Group->getName(); 1198 Flags |= ELF::SHF_GROUP; 1199 } 1200 1201 return Ctx->getELFSection(PseudoProbeSection->getName(), ELF::SHT_PROGBITS, 1202 Flags, 0, GroupName, true, ElfSec.getUniqueID(), 1203 cast<MCSymbolELF>(TextSec.getBeginSymbol())); 1204 } 1205 1206 MCSection * 1207 MCObjectFileInfo::getPseudoProbeDescSection(StringRef FuncName) const { 1208 if (Ctx->getObjectFileType() == MCContext::IsELF) { 1209 // Create a separate comdat group for each function's descriptor in order 1210 // for the linker to deduplicate. The duplication, must be from different 1211 // tranlation unit, can come from: 1212 // 1. Inline functions defined in header files; 1213 // 2. ThinLTO imported funcions; 1214 // 3. Weak-linkage definitions. 1215 // Use a concatenation of the section name and the function name as the 1216 // group name so that descriptor-only groups won't be folded with groups of 1217 // code. 1218 if (Ctx->getTargetTriple().supportsCOMDAT() && !FuncName.empty()) { 1219 auto *S = static_cast<MCSectionELF *>(PseudoProbeDescSection); 1220 auto Flags = S->getFlags() | ELF::SHF_GROUP; 1221 return Ctx->getELFSection(S->getName(), S->getType(), Flags, 1222 S->getEntrySize(), 1223 S->getName() + "_" + FuncName, 1224 /*IsComdat=*/true); 1225 } 1226 } 1227 return PseudoProbeDescSection; 1228 } 1229 1230 MCSection *MCObjectFileInfo::getLLVMStatsSection() const { 1231 return LLVMStatsSection; 1232 } 1233 1234 MCSection *MCObjectFileInfo::getPCSection(StringRef Name, 1235 const MCSection *TextSec) const { 1236 if (Ctx->getObjectFileType() != MCContext::IsELF) 1237 return nullptr; 1238 1239 // SHF_WRITE for relocations, and let user post-process data in-place. 1240 unsigned Flags = ELF::SHF_WRITE | ELF::SHF_ALLOC | ELF::SHF_LINK_ORDER; 1241 1242 if (!TextSec) 1243 TextSec = getTextSection(); 1244 1245 StringRef GroupName; 1246 const auto &ElfSec = static_cast<const MCSectionELF &>(*TextSec); 1247 if (const MCSymbol *Group = ElfSec.getGroup()) { 1248 GroupName = Group->getName(); 1249 Flags |= ELF::SHF_GROUP; 1250 } 1251 return Ctx->getELFSection(Name, ELF::SHT_PROGBITS, Flags, 0, GroupName, true, 1252 ElfSec.getUniqueID(), 1253 cast<MCSymbolELF>(TextSec->getBeginSymbol())); 1254 } 1255