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 // In fact DW_EH_PE_sdata4 is enough for us now, and GNU ld doesn't 347 // support pcrel|sdata8 well. Let's use sdata4 for now. 348 if (PositionIndependent) 349 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 350 else 351 FDECFIEncoding = Ctx->getAsmInfo()->getCodePointerSize() == 4 352 ? dwarf::DW_EH_PE_sdata4 353 : dwarf::DW_EH_PE_sdata8; 354 break; 355 case Triple::ppc64: 356 case Triple::ppc64le: 357 case Triple::aarch64: 358 case Triple::aarch64_be: 359 case Triple::x86_64: 360 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | 361 (Large ? dwarf::DW_EH_PE_sdata8 : dwarf::DW_EH_PE_sdata4); 362 break; 363 case Triple::bpfel: 364 case Triple::bpfeb: 365 FDECFIEncoding = dwarf::DW_EH_PE_sdata8; 366 break; 367 case Triple::hexagon: 368 FDECFIEncoding = 369 PositionIndependent ? dwarf::DW_EH_PE_pcrel : dwarf::DW_EH_PE_absptr; 370 break; 371 case Triple::xtensa: 372 FDECFIEncoding = dwarf::DW_EH_PE_sdata4; 373 break; 374 default: 375 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 376 break; 377 } 378 379 unsigned EHSectionType = T.getArch() == Triple::x86_64 380 ? ELF::SHT_X86_64_UNWIND 381 : ELF::SHT_PROGBITS; 382 383 // Solaris requires different flags for .eh_frame to seemingly every other 384 // platform. 385 unsigned EHSectionFlags = ELF::SHF_ALLOC; 386 if (T.isOSSolaris() && T.getArch() != Triple::x86_64) 387 EHSectionFlags |= ELF::SHF_WRITE; 388 389 // ELF 390 BSSSection = Ctx->getELFSection(".bss", ELF::SHT_NOBITS, 391 ELF::SHF_WRITE | ELF::SHF_ALLOC); 392 393 TextSection = Ctx->getELFSection(".text", ELF::SHT_PROGBITS, 394 ELF::SHF_EXECINSTR | ELF::SHF_ALLOC); 395 396 DataSection = Ctx->getELFSection(".data", ELF::SHT_PROGBITS, 397 ELF::SHF_WRITE | ELF::SHF_ALLOC); 398 399 ReadOnlySection = 400 Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); 401 402 TLSDataSection = 403 Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS, 404 ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE); 405 406 TLSBSSSection = Ctx->getELFSection( 407 ".tbss", ELF::SHT_NOBITS, ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE); 408 409 DataRelROSection = Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS, 410 ELF::SHF_ALLOC | ELF::SHF_WRITE); 411 412 MergeableConst4Section = 413 Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS, 414 ELF::SHF_ALLOC | ELF::SHF_MERGE, 4); 415 416 MergeableConst8Section = 417 Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS, 418 ELF::SHF_ALLOC | ELF::SHF_MERGE, 8); 419 420 MergeableConst16Section = 421 Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS, 422 ELF::SHF_ALLOC | ELF::SHF_MERGE, 16); 423 424 MergeableConst32Section = 425 Ctx->getELFSection(".rodata.cst32", ELF::SHT_PROGBITS, 426 ELF::SHF_ALLOC | ELF::SHF_MERGE, 32); 427 428 // Exception Handling Sections. 429 430 // FIXME: We're emitting LSDA info into a readonly section on ELF, even though 431 // it contains relocatable pointers. In PIC mode, this is probably a big 432 // runtime hit for C++ apps. Either the contents of the LSDA need to be 433 // adjusted or this should be a data section. 434 LSDASection = Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS, 435 ELF::SHF_ALLOC); 436 437 COFFDebugSymbolsSection = nullptr; 438 COFFDebugTypesSection = nullptr; 439 440 unsigned DebugSecType = ELF::SHT_PROGBITS; 441 442 // MIPS .debug_* sections should have SHT_MIPS_DWARF section type 443 // to distinguish among sections contain DWARF and ECOFF debug formats. 444 // Sections with ECOFF debug format are obsoleted and marked by SHT_PROGBITS. 445 if (T.isMIPS()) 446 DebugSecType = ELF::SHT_MIPS_DWARF; 447 448 // Debug Info Sections. 449 DwarfAbbrevSection = 450 Ctx->getELFSection(".debug_abbrev", DebugSecType, 0); 451 DwarfInfoSection = Ctx->getELFSection(".debug_info", DebugSecType, 0); 452 DwarfLineSection = Ctx->getELFSection(".debug_line", DebugSecType, 0); 453 DwarfLineStrSection = 454 Ctx->getELFSection(".debug_line_str", DebugSecType, 455 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1); 456 DwarfFrameSection = Ctx->getELFSection(".debug_frame", DebugSecType, 0); 457 DwarfPubNamesSection = 458 Ctx->getELFSection(".debug_pubnames", DebugSecType, 0); 459 DwarfPubTypesSection = 460 Ctx->getELFSection(".debug_pubtypes", DebugSecType, 0); 461 DwarfGnuPubNamesSection = 462 Ctx->getELFSection(".debug_gnu_pubnames", DebugSecType, 0); 463 DwarfGnuPubTypesSection = 464 Ctx->getELFSection(".debug_gnu_pubtypes", DebugSecType, 0); 465 DwarfStrSection = 466 Ctx->getELFSection(".debug_str", DebugSecType, 467 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1); 468 DwarfLocSection = Ctx->getELFSection(".debug_loc", DebugSecType, 0); 469 DwarfARangesSection = 470 Ctx->getELFSection(".debug_aranges", DebugSecType, 0); 471 DwarfRangesSection = 472 Ctx->getELFSection(".debug_ranges", DebugSecType, 0); 473 DwarfMacinfoSection = 474 Ctx->getELFSection(".debug_macinfo", DebugSecType, 0); 475 DwarfMacroSection = Ctx->getELFSection(".debug_macro", DebugSecType, 0); 476 477 // DWARF5 Experimental Debug Info 478 479 // Accelerator Tables 480 DwarfDebugNamesSection = 481 Ctx->getELFSection(".debug_names", ELF::SHT_PROGBITS, 0); 482 DwarfAccelNamesSection = 483 Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0); 484 DwarfAccelObjCSection = 485 Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0); 486 DwarfAccelNamespaceSection = 487 Ctx->getELFSection(".apple_namespaces", ELF::SHT_PROGBITS, 0); 488 DwarfAccelTypesSection = 489 Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0); 490 491 // String Offset and Address Sections 492 DwarfStrOffSection = 493 Ctx->getELFSection(".debug_str_offsets", DebugSecType, 0); 494 DwarfAddrSection = Ctx->getELFSection(".debug_addr", DebugSecType, 0); 495 DwarfRnglistsSection = Ctx->getELFSection(".debug_rnglists", DebugSecType, 0); 496 DwarfLoclistsSection = Ctx->getELFSection(".debug_loclists", DebugSecType, 0); 497 498 // Fission Sections 499 DwarfInfoDWOSection = 500 Ctx->getELFSection(".debug_info.dwo", DebugSecType, ELF::SHF_EXCLUDE); 501 DwarfTypesDWOSection = 502 Ctx->getELFSection(".debug_types.dwo", DebugSecType, ELF::SHF_EXCLUDE); 503 DwarfAbbrevDWOSection = 504 Ctx->getELFSection(".debug_abbrev.dwo", DebugSecType, ELF::SHF_EXCLUDE); 505 DwarfStrDWOSection = Ctx->getELFSection( 506 ".debug_str.dwo", DebugSecType, 507 ELF::SHF_MERGE | ELF::SHF_STRINGS | ELF::SHF_EXCLUDE, 1); 508 DwarfLineDWOSection = 509 Ctx->getELFSection(".debug_line.dwo", DebugSecType, ELF::SHF_EXCLUDE); 510 DwarfLocDWOSection = 511 Ctx->getELFSection(".debug_loc.dwo", DebugSecType, ELF::SHF_EXCLUDE); 512 DwarfStrOffDWOSection = Ctx->getELFSection(".debug_str_offsets.dwo", 513 DebugSecType, ELF::SHF_EXCLUDE); 514 DwarfRnglistsDWOSection = 515 Ctx->getELFSection(".debug_rnglists.dwo", DebugSecType, ELF::SHF_EXCLUDE); 516 DwarfMacinfoDWOSection = 517 Ctx->getELFSection(".debug_macinfo.dwo", DebugSecType, ELF::SHF_EXCLUDE); 518 DwarfMacroDWOSection = 519 Ctx->getELFSection(".debug_macro.dwo", DebugSecType, ELF::SHF_EXCLUDE); 520 521 DwarfLoclistsDWOSection = 522 Ctx->getELFSection(".debug_loclists.dwo", DebugSecType, ELF::SHF_EXCLUDE); 523 524 // DWP Sections 525 DwarfCUIndexSection = 526 Ctx->getELFSection(".debug_cu_index", DebugSecType, 0); 527 DwarfTUIndexSection = 528 Ctx->getELFSection(".debug_tu_index", DebugSecType, 0); 529 530 StackMapSection = 531 Ctx->getELFSection(".llvm_stackmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); 532 533 FaultMapSection = 534 Ctx->getELFSection(".llvm_faultmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); 535 536 EHFrameSection = 537 Ctx->getELFSection(".eh_frame", EHSectionType, EHSectionFlags); 538 539 StackSizesSection = Ctx->getELFSection(".stack_sizes", ELF::SHT_PROGBITS, 0); 540 541 PseudoProbeSection = Ctx->getELFSection(".pseudo_probe", DebugSecType, 0); 542 PseudoProbeDescSection = 543 Ctx->getELFSection(".pseudo_probe_desc", DebugSecType, 0); 544 545 LLVMStatsSection = Ctx->getELFSection(".llvm_stats", ELF::SHT_PROGBITS, 0); 546 } 547 548 void MCObjectFileInfo::initGOFFMCObjectFileInfo(const Triple &T) { 549 TextSection = 550 Ctx->getGOFFSection(".text", SectionKind::getText(), nullptr, nullptr); 551 BSSSection = 552 Ctx->getGOFFSection(".bss", SectionKind::getBSS(), nullptr, nullptr); 553 PPA1Section = 554 Ctx->getGOFFSection(".ppa1", SectionKind::getMetadata(), TextSection, 555 MCConstantExpr::create(GOFF::SK_PPA1, *Ctx)); 556 PPA2Section = 557 Ctx->getGOFFSection(".ppa2", SectionKind::getMetadata(), TextSection, 558 MCConstantExpr::create(GOFF::SK_PPA2, *Ctx)); 559 560 PPA2ListSection = 561 Ctx->getGOFFSection(".ppa2list", SectionKind::getData(), 562 nullptr, nullptr); 563 564 ADASection = 565 Ctx->getGOFFSection(".ada", SectionKind::getData(), nullptr, nullptr); 566 IDRLSection = 567 Ctx->getGOFFSection("B_IDRL", SectionKind::getData(), nullptr, nullptr); 568 } 569 570 void MCObjectFileInfo::initCOFFMCObjectFileInfo(const Triple &T) { 571 EHFrameSection = 572 Ctx->getCOFFSection(".eh_frame", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 573 COFF::IMAGE_SCN_MEM_READ); 574 575 // Set the `IMAGE_SCN_MEM_16BIT` flag when compiling for thumb mode. This is 576 // used to indicate to the linker that the text segment contains thumb instructions 577 // and to set the ISA selection bit for calls accordingly. 578 const bool IsThumb = T.getArch() == Triple::thumb; 579 580 // COFF 581 BSSSection = Ctx->getCOFFSection( 582 ".bss", COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA | 583 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE); 584 TextSection = Ctx->getCOFFSection( 585 ".text", 586 (IsThumb ? COFF::IMAGE_SCN_MEM_16BIT : (COFF::SectionCharacteristics)0) | 587 COFF::IMAGE_SCN_CNT_CODE | COFF::IMAGE_SCN_MEM_EXECUTE | 588 COFF::IMAGE_SCN_MEM_READ); 589 DataSection = Ctx->getCOFFSection( 590 ".data", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ | 591 COFF::IMAGE_SCN_MEM_WRITE); 592 ReadOnlySection = 593 Ctx->getCOFFSection(".rdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 594 COFF::IMAGE_SCN_MEM_READ); 595 596 if (T.getArch() == Triple::x86_64 || T.getArch() == Triple::aarch64 || 597 T.getArch() == Triple::arm || T.getArch() == Triple::thumb) { 598 // On Windows with SEH, the LSDA is emitted into the .xdata section 599 LSDASection = nullptr; 600 } else { 601 LSDASection = Ctx->getCOFFSection(".gcc_except_table", 602 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 603 COFF::IMAGE_SCN_MEM_READ); 604 } 605 606 // Debug info. 607 COFFDebugSymbolsSection = 608 Ctx->getCOFFSection(".debug$S", (COFF::IMAGE_SCN_MEM_DISCARDABLE | 609 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 610 COFF::IMAGE_SCN_MEM_READ)); 611 COFFDebugTypesSection = 612 Ctx->getCOFFSection(".debug$T", (COFF::IMAGE_SCN_MEM_DISCARDABLE | 613 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 614 COFF::IMAGE_SCN_MEM_READ)); 615 COFFGlobalTypeHashesSection = 616 Ctx->getCOFFSection(".debug$H", (COFF::IMAGE_SCN_MEM_DISCARDABLE | 617 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 618 COFF::IMAGE_SCN_MEM_READ)); 619 620 DwarfAbbrevSection = Ctx->getCOFFSection( 621 ".debug_abbrev", 622 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 623 COFF::IMAGE_SCN_MEM_READ, 624 "section_abbrev"); 625 DwarfInfoSection = Ctx->getCOFFSection( 626 ".debug_info", 627 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 628 COFF::IMAGE_SCN_MEM_READ, 629 "section_info"); 630 DwarfLineSection = Ctx->getCOFFSection( 631 ".debug_line", 632 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 633 COFF::IMAGE_SCN_MEM_READ, 634 "section_line"); 635 DwarfLineStrSection = Ctx->getCOFFSection( 636 ".debug_line_str", 637 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 638 COFF::IMAGE_SCN_MEM_READ, 639 "section_line_str"); 640 DwarfFrameSection = Ctx->getCOFFSection( 641 ".debug_frame", COFF::IMAGE_SCN_MEM_DISCARDABLE | 642 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 643 COFF::IMAGE_SCN_MEM_READ); 644 DwarfPubNamesSection = Ctx->getCOFFSection( 645 ".debug_pubnames", COFF::IMAGE_SCN_MEM_DISCARDABLE | 646 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 647 COFF::IMAGE_SCN_MEM_READ); 648 DwarfPubTypesSection = Ctx->getCOFFSection( 649 ".debug_pubtypes", COFF::IMAGE_SCN_MEM_DISCARDABLE | 650 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 651 COFF::IMAGE_SCN_MEM_READ); 652 DwarfGnuPubNamesSection = Ctx->getCOFFSection( 653 ".debug_gnu_pubnames", COFF::IMAGE_SCN_MEM_DISCARDABLE | 654 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 655 COFF::IMAGE_SCN_MEM_READ); 656 DwarfGnuPubTypesSection = Ctx->getCOFFSection( 657 ".debug_gnu_pubtypes", COFF::IMAGE_SCN_MEM_DISCARDABLE | 658 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 659 COFF::IMAGE_SCN_MEM_READ); 660 DwarfStrSection = Ctx->getCOFFSection( 661 ".debug_str", 662 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 663 COFF::IMAGE_SCN_MEM_READ, 664 "info_string"); 665 DwarfStrOffSection = Ctx->getCOFFSection( 666 ".debug_str_offsets", 667 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 668 COFF::IMAGE_SCN_MEM_READ, 669 "section_str_off"); 670 DwarfLocSection = Ctx->getCOFFSection( 671 ".debug_loc", 672 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 673 COFF::IMAGE_SCN_MEM_READ, 674 "section_debug_loc"); 675 DwarfLoclistsSection = Ctx->getCOFFSection( 676 ".debug_loclists", 677 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 678 COFF::IMAGE_SCN_MEM_READ, 679 "section_debug_loclists"); 680 DwarfARangesSection = Ctx->getCOFFSection( 681 ".debug_aranges", COFF::IMAGE_SCN_MEM_DISCARDABLE | 682 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 683 COFF::IMAGE_SCN_MEM_READ); 684 DwarfRangesSection = Ctx->getCOFFSection( 685 ".debug_ranges", 686 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 687 COFF::IMAGE_SCN_MEM_READ, 688 "debug_range"); 689 DwarfRnglistsSection = Ctx->getCOFFSection( 690 ".debug_rnglists", 691 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 692 COFF::IMAGE_SCN_MEM_READ, 693 "debug_rnglists"); 694 DwarfMacinfoSection = Ctx->getCOFFSection( 695 ".debug_macinfo", 696 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 697 COFF::IMAGE_SCN_MEM_READ, 698 "debug_macinfo"); 699 DwarfMacroSection = Ctx->getCOFFSection( 700 ".debug_macro", 701 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 702 COFF::IMAGE_SCN_MEM_READ, 703 "debug_macro"); 704 DwarfMacinfoDWOSection = Ctx->getCOFFSection( 705 ".debug_macinfo.dwo", 706 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 707 COFF::IMAGE_SCN_MEM_READ, 708 "debug_macinfo.dwo"); 709 DwarfMacroDWOSection = Ctx->getCOFFSection( 710 ".debug_macro.dwo", 711 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 712 COFF::IMAGE_SCN_MEM_READ, 713 "debug_macro.dwo"); 714 DwarfInfoDWOSection = Ctx->getCOFFSection( 715 ".debug_info.dwo", 716 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 717 COFF::IMAGE_SCN_MEM_READ, 718 "section_info_dwo"); 719 DwarfTypesDWOSection = Ctx->getCOFFSection( 720 ".debug_types.dwo", 721 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 722 COFF::IMAGE_SCN_MEM_READ, 723 "section_types_dwo"); 724 DwarfAbbrevDWOSection = Ctx->getCOFFSection( 725 ".debug_abbrev.dwo", 726 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 727 COFF::IMAGE_SCN_MEM_READ, 728 "section_abbrev_dwo"); 729 DwarfStrDWOSection = Ctx->getCOFFSection( 730 ".debug_str.dwo", 731 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 732 COFF::IMAGE_SCN_MEM_READ, 733 "skel_string"); 734 DwarfLineDWOSection = Ctx->getCOFFSection( 735 ".debug_line.dwo", COFF::IMAGE_SCN_MEM_DISCARDABLE | 736 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 737 COFF::IMAGE_SCN_MEM_READ); 738 DwarfLocDWOSection = Ctx->getCOFFSection( 739 ".debug_loc.dwo", 740 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 741 COFF::IMAGE_SCN_MEM_READ, 742 "skel_loc"); 743 DwarfStrOffDWOSection = Ctx->getCOFFSection( 744 ".debug_str_offsets.dwo", 745 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 746 COFF::IMAGE_SCN_MEM_READ, 747 "section_str_off_dwo"); 748 DwarfAddrSection = Ctx->getCOFFSection( 749 ".debug_addr", 750 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 751 COFF::IMAGE_SCN_MEM_READ, 752 "addr_sec"); 753 DwarfCUIndexSection = Ctx->getCOFFSection( 754 ".debug_cu_index", COFF::IMAGE_SCN_MEM_DISCARDABLE | 755 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 756 COFF::IMAGE_SCN_MEM_READ); 757 DwarfTUIndexSection = Ctx->getCOFFSection( 758 ".debug_tu_index", COFF::IMAGE_SCN_MEM_DISCARDABLE | 759 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 760 COFF::IMAGE_SCN_MEM_READ); 761 DwarfDebugNamesSection = Ctx->getCOFFSection( 762 ".debug_names", 763 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 764 COFF::IMAGE_SCN_MEM_READ, 765 "debug_names_begin"); 766 DwarfAccelNamesSection = Ctx->getCOFFSection( 767 ".apple_names", 768 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 769 COFF::IMAGE_SCN_MEM_READ, 770 "names_begin"); 771 DwarfAccelNamespaceSection = Ctx->getCOFFSection( 772 ".apple_namespaces", 773 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 774 COFF::IMAGE_SCN_MEM_READ, 775 "namespac_begin"); 776 DwarfAccelTypesSection = Ctx->getCOFFSection( 777 ".apple_types", 778 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 779 COFF::IMAGE_SCN_MEM_READ, 780 "types_begin"); 781 DwarfAccelObjCSection = Ctx->getCOFFSection( 782 ".apple_objc", 783 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 784 COFF::IMAGE_SCN_MEM_READ, 785 "objc_begin"); 786 787 DrectveSection = Ctx->getCOFFSection( 788 ".drectve", COFF::IMAGE_SCN_LNK_INFO | COFF::IMAGE_SCN_LNK_REMOVE); 789 790 PDataSection = 791 Ctx->getCOFFSection(".pdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 792 COFF::IMAGE_SCN_MEM_READ); 793 794 XDataSection = 795 Ctx->getCOFFSection(".xdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 796 COFF::IMAGE_SCN_MEM_READ); 797 798 SXDataSection = Ctx->getCOFFSection(".sxdata", COFF::IMAGE_SCN_LNK_INFO); 799 800 GEHContSection = 801 Ctx->getCOFFSection(".gehcont$y", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 802 COFF::IMAGE_SCN_MEM_READ); 803 804 GFIDsSection = 805 Ctx->getCOFFSection(".gfids$y", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 806 COFF::IMAGE_SCN_MEM_READ); 807 808 GIATsSection = 809 Ctx->getCOFFSection(".giats$y", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 810 COFF::IMAGE_SCN_MEM_READ); 811 812 GLJMPSection = 813 Ctx->getCOFFSection(".gljmp$y", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 814 COFF::IMAGE_SCN_MEM_READ); 815 816 TLSDataSection = Ctx->getCOFFSection( 817 ".tls$", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ | 818 COFF::IMAGE_SCN_MEM_WRITE); 819 820 StackMapSection = Ctx->getCOFFSection(".llvm_stackmaps", 821 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 822 COFF::IMAGE_SCN_MEM_READ); 823 } 824 825 void MCObjectFileInfo::initSPIRVMCObjectFileInfo(const Triple &T) { 826 // Put everything in a single binary section. 827 TextSection = Ctx->getSPIRVSection(); 828 } 829 830 void MCObjectFileInfo::initWasmMCObjectFileInfo(const Triple &T) { 831 TextSection = Ctx->getWasmSection(".text", SectionKind::getText()); 832 DataSection = Ctx->getWasmSection(".data", SectionKind::getData()); 833 834 DwarfLineSection = 835 Ctx->getWasmSection(".debug_line", SectionKind::getMetadata()); 836 DwarfLineStrSection = 837 Ctx->getWasmSection(".debug_line_str", SectionKind::getMetadata(), 838 wasm::WASM_SEG_FLAG_STRINGS); 839 DwarfStrSection = Ctx->getWasmSection( 840 ".debug_str", SectionKind::getMetadata(), wasm::WASM_SEG_FLAG_STRINGS); 841 DwarfLocSection = 842 Ctx->getWasmSection(".debug_loc", SectionKind::getMetadata()); 843 DwarfAbbrevSection = 844 Ctx->getWasmSection(".debug_abbrev", SectionKind::getMetadata()); 845 DwarfARangesSection = Ctx->getWasmSection(".debug_aranges", SectionKind::getMetadata()); 846 DwarfRangesSection = 847 Ctx->getWasmSection(".debug_ranges", SectionKind::getMetadata()); 848 DwarfMacinfoSection = 849 Ctx->getWasmSection(".debug_macinfo", SectionKind::getMetadata()); 850 DwarfMacroSection = 851 Ctx->getWasmSection(".debug_macro", SectionKind::getMetadata()); 852 DwarfCUIndexSection = Ctx->getWasmSection(".debug_cu_index", SectionKind::getMetadata()); 853 DwarfTUIndexSection = Ctx->getWasmSection(".debug_tu_index", SectionKind::getMetadata()); 854 DwarfInfoSection = 855 Ctx->getWasmSection(".debug_info", SectionKind::getMetadata()); 856 DwarfFrameSection = Ctx->getWasmSection(".debug_frame", SectionKind::getMetadata()); 857 DwarfPubNamesSection = Ctx->getWasmSection(".debug_pubnames", SectionKind::getMetadata()); 858 DwarfPubTypesSection = Ctx->getWasmSection(".debug_pubtypes", SectionKind::getMetadata()); 859 DwarfGnuPubNamesSection = 860 Ctx->getWasmSection(".debug_gnu_pubnames", SectionKind::getMetadata()); 861 DwarfGnuPubTypesSection = 862 Ctx->getWasmSection(".debug_gnu_pubtypes", SectionKind::getMetadata()); 863 864 DwarfDebugNamesSection = 865 Ctx->getWasmSection(".debug_names", SectionKind::getMetadata()); 866 DwarfStrOffSection = 867 Ctx->getWasmSection(".debug_str_offsets", SectionKind::getMetadata()); 868 DwarfAddrSection = 869 Ctx->getWasmSection(".debug_addr", SectionKind::getMetadata()); 870 DwarfRnglistsSection = 871 Ctx->getWasmSection(".debug_rnglists", SectionKind::getMetadata()); 872 DwarfLoclistsSection = 873 Ctx->getWasmSection(".debug_loclists", SectionKind::getMetadata()); 874 875 // Fission Sections 876 DwarfInfoDWOSection = 877 Ctx->getWasmSection(".debug_info.dwo", SectionKind::getMetadata()); 878 DwarfTypesDWOSection = 879 Ctx->getWasmSection(".debug_types.dwo", SectionKind::getMetadata()); 880 DwarfAbbrevDWOSection = 881 Ctx->getWasmSection(".debug_abbrev.dwo", SectionKind::getMetadata()); 882 DwarfStrDWOSection = 883 Ctx->getWasmSection(".debug_str.dwo", SectionKind::getMetadata(), 884 wasm::WASM_SEG_FLAG_STRINGS); 885 DwarfLineDWOSection = 886 Ctx->getWasmSection(".debug_line.dwo", SectionKind::getMetadata()); 887 DwarfLocDWOSection = 888 Ctx->getWasmSection(".debug_loc.dwo", SectionKind::getMetadata()); 889 DwarfStrOffDWOSection = 890 Ctx->getWasmSection(".debug_str_offsets.dwo", SectionKind::getMetadata()); 891 DwarfRnglistsDWOSection = 892 Ctx->getWasmSection(".debug_rnglists.dwo", SectionKind::getMetadata()); 893 DwarfMacinfoDWOSection = 894 Ctx->getWasmSection(".debug_macinfo.dwo", SectionKind::getMetadata()); 895 DwarfMacroDWOSection = 896 Ctx->getWasmSection(".debug_macro.dwo", SectionKind::getMetadata()); 897 898 DwarfLoclistsDWOSection = 899 Ctx->getWasmSection(".debug_loclists.dwo", SectionKind::getMetadata()); 900 901 // DWP Sections 902 DwarfCUIndexSection = 903 Ctx->getWasmSection(".debug_cu_index", SectionKind::getMetadata()); 904 DwarfTUIndexSection = 905 Ctx->getWasmSection(".debug_tu_index", SectionKind::getMetadata()); 906 907 // Wasm use data section for LSDA. 908 // TODO Consider putting each function's exception table in a separate 909 // section, as in -function-sections, to facilitate lld's --gc-section. 910 LSDASection = Ctx->getWasmSection(".rodata.gcc_except_table", 911 SectionKind::getReadOnlyWithRel()); 912 913 // TODO: Define more sections. 914 } 915 916 void MCObjectFileInfo::initXCOFFMCObjectFileInfo(const Triple &T) { 917 // The default csect for program code. Functions without a specified section 918 // get placed into this csect. The choice of csect name is not a property of 919 // the ABI or object file format, but various tools rely on the section 920 // name being empty (considering named symbols to be "user symbol names"). 921 TextSection = Ctx->getXCOFFSection( 922 "..text..", // Use a non-null name to work around an AIX assembler bug... 923 SectionKind::getText(), 924 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_PR, XCOFF::XTY_SD), 925 /* MultiSymbolsAllowed*/ true); 926 927 // ... but use a null name when generating the symbol table. 928 MCSectionXCOFF *TS = static_cast<MCSectionXCOFF *>(TextSection); 929 TS->getQualNameSymbol()->setSymbolTableName(""); 930 TS->setSymbolTableName(""); 931 932 DataSection = Ctx->getXCOFFSection( 933 ".data", SectionKind::getData(), 934 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_RW, XCOFF::XTY_SD), 935 /* MultiSymbolsAllowed*/ true); 936 937 ReadOnlySection = Ctx->getXCOFFSection( 938 ".rodata", SectionKind::getReadOnly(), 939 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_RO, XCOFF::XTY_SD), 940 /* MultiSymbolsAllowed*/ true); 941 ReadOnlySection->setAlignment(Align(4)); 942 943 ReadOnly8Section = Ctx->getXCOFFSection( 944 ".rodata.8", SectionKind::getReadOnly(), 945 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_RO, XCOFF::XTY_SD), 946 /* MultiSymbolsAllowed*/ true); 947 ReadOnly8Section->setAlignment(Align(8)); 948 949 ReadOnly16Section = Ctx->getXCOFFSection( 950 ".rodata.16", SectionKind::getReadOnly(), 951 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_RO, XCOFF::XTY_SD), 952 /* MultiSymbolsAllowed*/ true); 953 ReadOnly16Section->setAlignment(Align(16)); 954 955 TLSDataSection = Ctx->getXCOFFSection( 956 ".tdata", SectionKind::getThreadData(), 957 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_TL, XCOFF::XTY_SD), 958 /* MultiSymbolsAllowed*/ true); 959 960 TOCBaseSection = Ctx->getXCOFFSection( 961 "TOC", SectionKind::getData(), 962 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_TC0, 963 XCOFF::XTY_SD)); 964 965 // The TOC-base always has 0 size, but 4 byte alignment. 966 TOCBaseSection->setAlignment(Align(4)); 967 968 LSDASection = Ctx->getXCOFFSection( 969 ".gcc_except_table", SectionKind::getReadOnly(), 970 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_RO, 971 XCOFF::XTY_SD)); 972 973 CompactUnwindSection = Ctx->getXCOFFSection( 974 ".eh_info_table", SectionKind::getData(), 975 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_RW, 976 XCOFF::XTY_SD)); 977 978 // DWARF sections for XCOFF are not csects. They are special STYP_DWARF 979 // sections, and the individual DWARF sections are distinguished by their 980 // section subtype. 981 DwarfAbbrevSection = Ctx->getXCOFFSection( 982 ".dwabrev", SectionKind::getMetadata(), 983 /* CsectProperties */ std::nullopt, 984 /* MultiSymbolsAllowed */ true, ".dwabrev", XCOFF::SSUBTYP_DWABREV); 985 986 DwarfInfoSection = Ctx->getXCOFFSection( 987 ".dwinfo", SectionKind::getMetadata(), /* CsectProperties */ std::nullopt, 988 /* MultiSymbolsAllowed */ true, ".dwinfo", XCOFF::SSUBTYP_DWINFO); 989 990 DwarfLineSection = Ctx->getXCOFFSection( 991 ".dwline", SectionKind::getMetadata(), /* CsectProperties */ std::nullopt, 992 /* MultiSymbolsAllowed */ true, ".dwline", XCOFF::SSUBTYP_DWLINE); 993 994 DwarfFrameSection = Ctx->getXCOFFSection( 995 ".dwframe", SectionKind::getMetadata(), 996 /* CsectProperties */ std::nullopt, 997 /* MultiSymbolsAllowed */ true, ".dwframe", XCOFF::SSUBTYP_DWFRAME); 998 999 DwarfPubNamesSection = Ctx->getXCOFFSection( 1000 ".dwpbnms", SectionKind::getMetadata(), 1001 /* CsectProperties */ std::nullopt, 1002 /* MultiSymbolsAllowed */ true, ".dwpbnms", XCOFF::SSUBTYP_DWPBNMS); 1003 1004 DwarfPubTypesSection = Ctx->getXCOFFSection( 1005 ".dwpbtyp", SectionKind::getMetadata(), 1006 /* CsectProperties */ std::nullopt, 1007 /* MultiSymbolsAllowed */ true, ".dwpbtyp", XCOFF::SSUBTYP_DWPBTYP); 1008 1009 DwarfStrSection = Ctx->getXCOFFSection( 1010 ".dwstr", SectionKind::getMetadata(), /* CsectProperties */ std::nullopt, 1011 /* MultiSymbolsAllowed */ true, ".dwstr", XCOFF::SSUBTYP_DWSTR); 1012 1013 DwarfLocSection = Ctx->getXCOFFSection( 1014 ".dwloc", SectionKind::getMetadata(), /* CsectProperties */ std::nullopt, 1015 /* MultiSymbolsAllowed */ true, ".dwloc", XCOFF::SSUBTYP_DWLOC); 1016 1017 DwarfARangesSection = Ctx->getXCOFFSection( 1018 ".dwarnge", SectionKind::getMetadata(), 1019 /* CsectProperties */ std::nullopt, 1020 /* MultiSymbolsAllowed */ true, ".dwarnge", XCOFF::SSUBTYP_DWARNGE); 1021 1022 DwarfRangesSection = Ctx->getXCOFFSection( 1023 ".dwrnges", SectionKind::getMetadata(), 1024 /* CsectProperties */ std::nullopt, 1025 /* MultiSymbolsAllowed */ true, ".dwrnges", XCOFF::SSUBTYP_DWRNGES); 1026 1027 DwarfMacinfoSection = Ctx->getXCOFFSection( 1028 ".dwmac", SectionKind::getMetadata(), /* CsectProperties */ std::nullopt, 1029 /* MultiSymbolsAllowed */ true, ".dwmac", XCOFF::SSUBTYP_DWMAC); 1030 } 1031 1032 void MCObjectFileInfo::initDXContainerObjectFileInfo(const Triple &T) { 1033 // At the moment the DXBC section should end up empty. 1034 TextSection = Ctx->getDXContainerSection("DXBC", SectionKind::getText()); 1035 } 1036 1037 MCObjectFileInfo::~MCObjectFileInfo() = default; 1038 1039 void MCObjectFileInfo::initMCObjectFileInfo(MCContext &MCCtx, bool PIC, 1040 bool LargeCodeModel) { 1041 PositionIndependent = PIC; 1042 Ctx = &MCCtx; 1043 1044 // Common. 1045 SupportsWeakOmittedEHFrame = true; 1046 SupportsCompactUnwindWithoutEHFrame = false; 1047 OmitDwarfIfHaveCompactUnwind = false; 1048 1049 FDECFIEncoding = dwarf::DW_EH_PE_absptr; 1050 1051 CompactUnwindDwarfEHFrameOnly = 0; 1052 1053 EHFrameSection = nullptr; // Created on demand. 1054 CompactUnwindSection = nullptr; // Used only by selected targets. 1055 DwarfAccelNamesSection = nullptr; // Used only by selected targets. 1056 DwarfAccelObjCSection = nullptr; // Used only by selected targets. 1057 DwarfAccelNamespaceSection = nullptr; // Used only by selected targets. 1058 DwarfAccelTypesSection = nullptr; // Used only by selected targets. 1059 1060 Triple TheTriple = Ctx->getTargetTriple(); 1061 switch (Ctx->getObjectFileType()) { 1062 case MCContext::IsMachO: 1063 initMachOMCObjectFileInfo(TheTriple); 1064 break; 1065 case MCContext::IsCOFF: 1066 initCOFFMCObjectFileInfo(TheTriple); 1067 break; 1068 case MCContext::IsELF: 1069 initELFMCObjectFileInfo(TheTriple, LargeCodeModel); 1070 break; 1071 case MCContext::IsGOFF: 1072 initGOFFMCObjectFileInfo(TheTriple); 1073 break; 1074 case MCContext::IsSPIRV: 1075 initSPIRVMCObjectFileInfo(TheTriple); 1076 break; 1077 case MCContext::IsWasm: 1078 initWasmMCObjectFileInfo(TheTriple); 1079 break; 1080 case MCContext::IsXCOFF: 1081 initXCOFFMCObjectFileInfo(TheTriple); 1082 break; 1083 case MCContext::IsDXContainer: 1084 initDXContainerObjectFileInfo(TheTriple); 1085 break; 1086 } 1087 } 1088 1089 MCSection *MCObjectFileInfo::getDwarfComdatSection(const char *Name, 1090 uint64_t Hash) const { 1091 switch (Ctx->getTargetTriple().getObjectFormat()) { 1092 case Triple::ELF: 1093 return Ctx->getELFSection(Name, ELF::SHT_PROGBITS, ELF::SHF_GROUP, 0, 1094 utostr(Hash), /*IsComdat=*/true); 1095 case Triple::Wasm: 1096 return Ctx->getWasmSection(Name, SectionKind::getMetadata(), 0, 1097 utostr(Hash), MCContext::GenericSectionID); 1098 case Triple::MachO: 1099 case Triple::COFF: 1100 case Triple::GOFF: 1101 case Triple::SPIRV: 1102 case Triple::XCOFF: 1103 case Triple::DXContainer: 1104 case Triple::UnknownObjectFormat: 1105 report_fatal_error("Cannot get DWARF comdat section for this object file " 1106 "format: not implemented."); 1107 break; 1108 } 1109 llvm_unreachable("Unknown ObjectFormatType"); 1110 } 1111 1112 MCSection * 1113 MCObjectFileInfo::getStackSizesSection(const MCSection &TextSec) const { 1114 if ((Ctx->getObjectFileType() != MCContext::IsELF) || 1115 Ctx->getTargetTriple().isPS4()) 1116 return StackSizesSection; 1117 1118 const MCSectionELF &ElfSec = static_cast<const MCSectionELF &>(TextSec); 1119 unsigned Flags = ELF::SHF_LINK_ORDER; 1120 StringRef GroupName; 1121 if (const MCSymbol *Group = ElfSec.getGroup()) { 1122 GroupName = Group->getName(); 1123 Flags |= ELF::SHF_GROUP; 1124 } 1125 1126 return Ctx->getELFSection(".stack_sizes", ELF::SHT_PROGBITS, Flags, 0, 1127 GroupName, true, ElfSec.getUniqueID(), 1128 cast<MCSymbolELF>(TextSec.getBeginSymbol())); 1129 } 1130 1131 MCSection * 1132 MCObjectFileInfo::getBBAddrMapSection(const MCSection &TextSec) const { 1133 if (Ctx->getObjectFileType() != MCContext::IsELF) 1134 return nullptr; 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 // Use the text section's begin symbol and unique ID to create a separate 1145 // .llvm_bb_addr_map section associated with every unique text section. 1146 return Ctx->getELFSection(".llvm_bb_addr_map", ELF::SHT_LLVM_BB_ADDR_MAP, 1147 Flags, 0, GroupName, true, ElfSec.getUniqueID(), 1148 cast<MCSymbolELF>(TextSec.getBeginSymbol())); 1149 } 1150 1151 MCSection * 1152 MCObjectFileInfo::getKCFITrapSection(const MCSection &TextSec) const { 1153 if (Ctx->getObjectFileType() != MCContext::IsELF) 1154 return nullptr; 1155 1156 const MCSectionELF &ElfSec = static_cast<const MCSectionELF &>(TextSec); 1157 unsigned Flags = ELF::SHF_LINK_ORDER | ELF::SHF_ALLOC; 1158 StringRef GroupName; 1159 if (const MCSymbol *Group = ElfSec.getGroup()) { 1160 GroupName = Group->getName(); 1161 Flags |= ELF::SHF_GROUP; 1162 } 1163 1164 return Ctx->getELFSection(".kcfi_traps", ELF::SHT_PROGBITS, Flags, 0, 1165 GroupName, 1166 /*IsComdat=*/true, ElfSec.getUniqueID(), 1167 cast<MCSymbolELF>(TextSec.getBeginSymbol())); 1168 } 1169 1170 MCSection * 1171 MCObjectFileInfo::getPseudoProbeSection(const MCSection &TextSec) const { 1172 if (Ctx->getObjectFileType() != MCContext::IsELF) 1173 return PseudoProbeSection; 1174 1175 const auto &ElfSec = static_cast<const MCSectionELF &>(TextSec); 1176 unsigned Flags = ELF::SHF_LINK_ORDER; 1177 StringRef GroupName; 1178 if (const MCSymbol *Group = ElfSec.getGroup()) { 1179 GroupName = Group->getName(); 1180 Flags |= ELF::SHF_GROUP; 1181 } 1182 1183 return Ctx->getELFSection(PseudoProbeSection->getName(), ELF::SHT_PROGBITS, 1184 Flags, 0, GroupName, true, ElfSec.getUniqueID(), 1185 cast<MCSymbolELF>(TextSec.getBeginSymbol())); 1186 } 1187 1188 MCSection * 1189 MCObjectFileInfo::getPseudoProbeDescSection(StringRef FuncName) const { 1190 if (Ctx->getObjectFileType() == MCContext::IsELF) { 1191 // Create a separate comdat group for each function's descriptor in order 1192 // for the linker to deduplicate. The duplication, must be from different 1193 // tranlation unit, can come from: 1194 // 1. Inline functions defined in header files; 1195 // 2. ThinLTO imported funcions; 1196 // 3. Weak-linkage definitions. 1197 // Use a concatenation of the section name and the function name as the 1198 // group name so that descriptor-only groups won't be folded with groups of 1199 // code. 1200 if (Ctx->getTargetTriple().supportsCOMDAT() && !FuncName.empty()) { 1201 auto *S = static_cast<MCSectionELF *>(PseudoProbeDescSection); 1202 auto Flags = S->getFlags() | ELF::SHF_GROUP; 1203 return Ctx->getELFSection(S->getName(), S->getType(), Flags, 1204 S->getEntrySize(), 1205 S->getName() + "_" + FuncName, 1206 /*IsComdat=*/true); 1207 } 1208 } 1209 return PseudoProbeDescSection; 1210 } 1211 1212 MCSection *MCObjectFileInfo::getLLVMStatsSection() const { 1213 return LLVMStatsSection; 1214 } 1215 1216 MCSection *MCObjectFileInfo::getPCSection(StringRef Name, 1217 const MCSection *TextSec) const { 1218 if (Ctx->getObjectFileType() != MCContext::IsELF) 1219 return nullptr; 1220 1221 // SHF_WRITE for relocations, and let user post-process data in-place. 1222 unsigned Flags = ELF::SHF_WRITE | ELF::SHF_ALLOC | ELF::SHF_LINK_ORDER; 1223 1224 if (!TextSec) 1225 TextSec = getTextSection(); 1226 1227 StringRef GroupName; 1228 const auto &ElfSec = static_cast<const MCSectionELF &>(*TextSec); 1229 if (const MCSymbol *Group = ElfSec.getGroup()) { 1230 GroupName = Group->getName(); 1231 Flags |= ELF::SHF_GROUP; 1232 } 1233 return Ctx->getELFSection(Name, ELF::SHT_PROGBITS, Flags, 0, GroupName, true, 1234 ElfSec.getUniqueID(), 1235 cast<MCSymbolELF>(TextSec->getBeginSymbol())); 1236 } 1237