1 //===-- MCObjectFileInfo.cpp - Object File Information --------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "llvm/MC/MCObjectFileInfo.h" 10 #include "llvm/ADT/StringExtras.h" 11 #include "llvm/ADT/Triple.h" 12 #include "llvm/BinaryFormat/COFF.h" 13 #include "llvm/BinaryFormat/ELF.h" 14 #include "llvm/BinaryFormat/Wasm.h" 15 #include "llvm/MC/MCAsmInfo.h" 16 #include "llvm/MC/MCContext.h" 17 #include "llvm/MC/MCSection.h" 18 #include "llvm/MC/MCSectionCOFF.h" 19 #include "llvm/MC/MCSectionELF.h" 20 #include "llvm/MC/MCSectionMachO.h" 21 #include "llvm/MC/MCSectionWasm.h" 22 #include "llvm/MC/MCSectionXCOFF.h" 23 24 using namespace llvm; 25 26 static bool useCompactUnwind(const Triple &T) { 27 // Only on darwin. 28 if (!T.isOSDarwin()) 29 return false; 30 31 // aarch64 always has it. 32 if (T.getArch() == Triple::aarch64 || T.getArch() == Triple::aarch64_32) 33 return true; 34 35 // armv7k always has it. 36 if (T.isWatchABI()) 37 return true; 38 39 // Use it on newer version of OS X. 40 if (T.isMacOSX() && !T.isMacOSXVersionLT(10, 6)) 41 return true; 42 43 // And the iOS simulator. 44 if (T.isiOS() && T.isX86()) 45 return true; 46 47 return false; 48 } 49 50 void MCObjectFileInfo::initMachOMCObjectFileInfo(const Triple &T) { 51 // MachO 52 SupportsWeakOmittedEHFrame = false; 53 54 EHFrameSection = Ctx->getMachOSection( 55 "__TEXT", "__eh_frame", 56 MachO::S_COALESCED | MachO::S_ATTR_NO_TOC | 57 MachO::S_ATTR_STRIP_STATIC_SYMS | MachO::S_ATTR_LIVE_SUPPORT, 58 SectionKind::getReadOnly()); 59 60 if (T.isOSDarwin() && 61 (T.getArch() == Triple::aarch64 || T.getArch() == Triple::aarch64_32)) 62 SupportsCompactUnwindWithoutEHFrame = true; 63 64 if (T.isWatchABI()) 65 OmitDwarfIfHaveCompactUnwind = true; 66 67 FDECFIEncoding = dwarf::DW_EH_PE_pcrel; 68 69 // .comm doesn't support alignment before Leopard. 70 if (T.isMacOSX() && T.isMacOSXVersionLT(10, 5)) 71 CommDirectiveSupportsAlignment = false; 72 73 TextSection // .text 74 = Ctx->getMachOSection("__TEXT", "__text", 75 MachO::S_ATTR_PURE_INSTRUCTIONS, 76 SectionKind::getText()); 77 DataSection // .data 78 = Ctx->getMachOSection("__DATA", "__data", 0, SectionKind::getData()); 79 80 // BSSSection might not be expected initialized on msvc. 81 BSSSection = nullptr; 82 83 TLSDataSection // .tdata 84 = Ctx->getMachOSection("__DATA", "__thread_data", 85 MachO::S_THREAD_LOCAL_REGULAR, 86 SectionKind::getData()); 87 TLSBSSSection // .tbss 88 = Ctx->getMachOSection("__DATA", "__thread_bss", 89 MachO::S_THREAD_LOCAL_ZEROFILL, 90 SectionKind::getThreadBSS()); 91 92 // TODO: Verify datarel below. 93 TLSTLVSection // .tlv 94 = Ctx->getMachOSection("__DATA", "__thread_vars", 95 MachO::S_THREAD_LOCAL_VARIABLES, 96 SectionKind::getData()); 97 98 TLSThreadInitSection = Ctx->getMachOSection( 99 "__DATA", "__thread_init", MachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS, 100 SectionKind::getData()); 101 102 CStringSection // .cstring 103 = Ctx->getMachOSection("__TEXT", "__cstring", 104 MachO::S_CSTRING_LITERALS, 105 SectionKind::getMergeable1ByteCString()); 106 UStringSection 107 = Ctx->getMachOSection("__TEXT","__ustring", 0, 108 SectionKind::getMergeable2ByteCString()); 109 FourByteConstantSection // .literal4 110 = Ctx->getMachOSection("__TEXT", "__literal4", 111 MachO::S_4BYTE_LITERALS, 112 SectionKind::getMergeableConst4()); 113 EightByteConstantSection // .literal8 114 = Ctx->getMachOSection("__TEXT", "__literal8", 115 MachO::S_8BYTE_LITERALS, 116 SectionKind::getMergeableConst8()); 117 118 SixteenByteConstantSection // .literal16 119 = Ctx->getMachOSection("__TEXT", "__literal16", 120 MachO::S_16BYTE_LITERALS, 121 SectionKind::getMergeableConst16()); 122 123 ReadOnlySection // .const 124 = Ctx->getMachOSection("__TEXT", "__const", 0, 125 SectionKind::getReadOnly()); 126 127 // If the target is not powerpc, map the coal sections to the non-coal 128 // sections. 129 // 130 // "__TEXT/__textcoal_nt" => section "__TEXT/__text" 131 // "__TEXT/__const_coal" => section "__TEXT/__const" 132 // "__DATA/__datacoal_nt" => section "__DATA/__data" 133 Triple::ArchType ArchTy = T.getArch(); 134 135 ConstDataSection // .const_data 136 = Ctx->getMachOSection("__DATA", "__const", 0, 137 SectionKind::getReadOnlyWithRel()); 138 139 if (ArchTy == Triple::ppc || ArchTy == Triple::ppc64) { 140 TextCoalSection 141 = Ctx->getMachOSection("__TEXT", "__textcoal_nt", 142 MachO::S_COALESCED | 143 MachO::S_ATTR_PURE_INSTRUCTIONS, 144 SectionKind::getText()); 145 ConstTextCoalSection 146 = Ctx->getMachOSection("__TEXT", "__const_coal", 147 MachO::S_COALESCED, 148 SectionKind::getReadOnly()); 149 DataCoalSection = Ctx->getMachOSection( 150 "__DATA", "__datacoal_nt", MachO::S_COALESCED, SectionKind::getData()); 151 ConstDataCoalSection = DataCoalSection; 152 } else { 153 TextCoalSection = TextSection; 154 ConstTextCoalSection = ReadOnlySection; 155 DataCoalSection = DataSection; 156 ConstDataCoalSection = ConstDataSection; 157 } 158 159 DataCommonSection 160 = Ctx->getMachOSection("__DATA","__common", 161 MachO::S_ZEROFILL, 162 SectionKind::getBSS()); 163 DataBSSSection 164 = Ctx->getMachOSection("__DATA","__bss", MachO::S_ZEROFILL, 165 SectionKind::getBSS()); 166 167 168 LazySymbolPointerSection 169 = Ctx->getMachOSection("__DATA", "__la_symbol_ptr", 170 MachO::S_LAZY_SYMBOL_POINTERS, 171 SectionKind::getMetadata()); 172 NonLazySymbolPointerSection 173 = Ctx->getMachOSection("__DATA", "__nl_symbol_ptr", 174 MachO::S_NON_LAZY_SYMBOL_POINTERS, 175 SectionKind::getMetadata()); 176 177 ThreadLocalPointerSection 178 = Ctx->getMachOSection("__DATA", "__thread_ptr", 179 MachO::S_THREAD_LOCAL_VARIABLE_POINTERS, 180 SectionKind::getMetadata()); 181 182 // Exception Handling. 183 LSDASection = Ctx->getMachOSection("__TEXT", "__gcc_except_tab", 0, 184 SectionKind::getReadOnlyWithRel()); 185 186 COFFDebugSymbolsSection = nullptr; 187 COFFDebugTypesSection = nullptr; 188 COFFGlobalTypeHashesSection = nullptr; 189 190 if (useCompactUnwind(T)) { 191 CompactUnwindSection = 192 Ctx->getMachOSection("__LD", "__compact_unwind", MachO::S_ATTR_DEBUG, 193 SectionKind::getReadOnly()); 194 195 if (T.isX86()) 196 CompactUnwindDwarfEHFrameOnly = 0x04000000; // UNWIND_X86_64_MODE_DWARF 197 else if (T.getArch() == Triple::aarch64 || T.getArch() == Triple::aarch64_32) 198 CompactUnwindDwarfEHFrameOnly = 0x03000000; // UNWIND_ARM64_MODE_DWARF 199 else if (T.getArch() == Triple::arm || T.getArch() == Triple::thumb) 200 CompactUnwindDwarfEHFrameOnly = 0x04000000; // UNWIND_ARM_MODE_DWARF 201 } 202 203 // Debug Information. 204 DwarfDebugNamesSection = 205 Ctx->getMachOSection("__DWARF", "__debug_names", MachO::S_ATTR_DEBUG, 206 SectionKind::getMetadata(), "debug_names_begin"); 207 DwarfAccelNamesSection = 208 Ctx->getMachOSection("__DWARF", "__apple_names", MachO::S_ATTR_DEBUG, 209 SectionKind::getMetadata(), "names_begin"); 210 DwarfAccelObjCSection = 211 Ctx->getMachOSection("__DWARF", "__apple_objc", MachO::S_ATTR_DEBUG, 212 SectionKind::getMetadata(), "objc_begin"); 213 // 16 character section limit... 214 DwarfAccelNamespaceSection = 215 Ctx->getMachOSection("__DWARF", "__apple_namespac", MachO::S_ATTR_DEBUG, 216 SectionKind::getMetadata(), "namespac_begin"); 217 DwarfAccelTypesSection = 218 Ctx->getMachOSection("__DWARF", "__apple_types", MachO::S_ATTR_DEBUG, 219 SectionKind::getMetadata(), "types_begin"); 220 221 DwarfSwiftASTSection = 222 Ctx->getMachOSection("__DWARF", "__swift_ast", MachO::S_ATTR_DEBUG, 223 SectionKind::getMetadata()); 224 225 DwarfAbbrevSection = 226 Ctx->getMachOSection("__DWARF", "__debug_abbrev", MachO::S_ATTR_DEBUG, 227 SectionKind::getMetadata(), "section_abbrev"); 228 DwarfInfoSection = 229 Ctx->getMachOSection("__DWARF", "__debug_info", MachO::S_ATTR_DEBUG, 230 SectionKind::getMetadata(), "section_info"); 231 DwarfLineSection = 232 Ctx->getMachOSection("__DWARF", "__debug_line", MachO::S_ATTR_DEBUG, 233 SectionKind::getMetadata(), "section_line"); 234 DwarfLineStrSection = 235 Ctx->getMachOSection("__DWARF", "__debug_line_str", MachO::S_ATTR_DEBUG, 236 SectionKind::getMetadata(), "section_line_str"); 237 DwarfFrameSection = 238 Ctx->getMachOSection("__DWARF", "__debug_frame", MachO::S_ATTR_DEBUG, 239 SectionKind::getMetadata()); 240 DwarfPubNamesSection = 241 Ctx->getMachOSection("__DWARF", "__debug_pubnames", MachO::S_ATTR_DEBUG, 242 SectionKind::getMetadata()); 243 DwarfPubTypesSection = 244 Ctx->getMachOSection("__DWARF", "__debug_pubtypes", MachO::S_ATTR_DEBUG, 245 SectionKind::getMetadata()); 246 DwarfGnuPubNamesSection = 247 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubn", MachO::S_ATTR_DEBUG, 248 SectionKind::getMetadata()); 249 DwarfGnuPubTypesSection = 250 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubt", MachO::S_ATTR_DEBUG, 251 SectionKind::getMetadata()); 252 DwarfStrSection = 253 Ctx->getMachOSection("__DWARF", "__debug_str", MachO::S_ATTR_DEBUG, 254 SectionKind::getMetadata(), "info_string"); 255 DwarfStrOffSection = 256 Ctx->getMachOSection("__DWARF", "__debug_str_offs", MachO::S_ATTR_DEBUG, 257 SectionKind::getMetadata(), "section_str_off"); 258 DwarfAddrSection = 259 Ctx->getMachOSection("__DWARF", "__debug_addr", MachO::S_ATTR_DEBUG, 260 SectionKind::getMetadata(), "section_info"); 261 DwarfLocSection = 262 Ctx->getMachOSection("__DWARF", "__debug_loc", MachO::S_ATTR_DEBUG, 263 SectionKind::getMetadata(), "section_debug_loc"); 264 DwarfLoclistsSection = 265 Ctx->getMachOSection("__DWARF", "__debug_loclists", MachO::S_ATTR_DEBUG, 266 SectionKind::getMetadata(), "section_debug_loc"); 267 268 DwarfARangesSection = 269 Ctx->getMachOSection("__DWARF", "__debug_aranges", MachO::S_ATTR_DEBUG, 270 SectionKind::getMetadata()); 271 DwarfRangesSection = 272 Ctx->getMachOSection("__DWARF", "__debug_ranges", MachO::S_ATTR_DEBUG, 273 SectionKind::getMetadata(), "debug_range"); 274 DwarfRnglistsSection = 275 Ctx->getMachOSection("__DWARF", "__debug_rnglists", MachO::S_ATTR_DEBUG, 276 SectionKind::getMetadata(), "debug_range"); 277 DwarfMacinfoSection = 278 Ctx->getMachOSection("__DWARF", "__debug_macinfo", MachO::S_ATTR_DEBUG, 279 SectionKind::getMetadata(), "debug_macinfo"); 280 DwarfMacroSection = 281 Ctx->getMachOSection("__DWARF", "__debug_macro", MachO::S_ATTR_DEBUG, 282 SectionKind::getMetadata(), "debug_macro"); 283 DwarfDebugInlineSection = 284 Ctx->getMachOSection("__DWARF", "__debug_inlined", MachO::S_ATTR_DEBUG, 285 SectionKind::getMetadata()); 286 DwarfCUIndexSection = 287 Ctx->getMachOSection("__DWARF", "__debug_cu_index", MachO::S_ATTR_DEBUG, 288 SectionKind::getMetadata()); 289 DwarfTUIndexSection = 290 Ctx->getMachOSection("__DWARF", "__debug_tu_index", MachO::S_ATTR_DEBUG, 291 SectionKind::getMetadata()); 292 StackMapSection = Ctx->getMachOSection("__LLVM_STACKMAPS", "__llvm_stackmaps", 293 0, SectionKind::getMetadata()); 294 295 FaultMapSection = Ctx->getMachOSection("__LLVM_FAULTMAPS", "__llvm_faultmaps", 296 0, SectionKind::getMetadata()); 297 298 RemarksSection = Ctx->getMachOSection( 299 "__LLVM", "__remarks", MachO::S_ATTR_DEBUG, SectionKind::getMetadata()); 300 301 TLSExtraDataSection = TLSTLVSection; 302 } 303 304 void MCObjectFileInfo::initELFMCObjectFileInfo(const Triple &T, bool Large) { 305 switch (T.getArch()) { 306 case Triple::mips: 307 case Triple::mipsel: 308 case Triple::mips64: 309 case Triple::mips64el: 310 // We cannot use DW_EH_PE_sdata8 for the large PositionIndependent case 311 // since there is no R_MIPS_PC64 relocation (only a 32-bit version). 312 if (PositionIndependent && !Large) 313 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 314 else 315 FDECFIEncoding = Ctx->getAsmInfo()->getCodePointerSize() == 4 316 ? dwarf::DW_EH_PE_sdata4 317 : dwarf::DW_EH_PE_sdata8; 318 break; 319 case Triple::ppc64: 320 case Triple::ppc64le: 321 case Triple::aarch64: 322 case Triple::aarch64_be: 323 case Triple::x86_64: 324 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | 325 (Large ? dwarf::DW_EH_PE_sdata8 : dwarf::DW_EH_PE_sdata4); 326 break; 327 case Triple::bpfel: 328 case Triple::bpfeb: 329 FDECFIEncoding = dwarf::DW_EH_PE_sdata8; 330 break; 331 case Triple::hexagon: 332 FDECFIEncoding = 333 PositionIndependent ? dwarf::DW_EH_PE_pcrel : dwarf::DW_EH_PE_absptr; 334 break; 335 default: 336 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 337 break; 338 } 339 340 unsigned EHSectionType = T.getArch() == Triple::x86_64 341 ? ELF::SHT_X86_64_UNWIND 342 : ELF::SHT_PROGBITS; 343 344 // Solaris requires different flags for .eh_frame to seemingly every other 345 // platform. 346 unsigned EHSectionFlags = ELF::SHF_ALLOC; 347 if (T.isOSSolaris() && T.getArch() != Triple::x86_64) 348 EHSectionFlags |= ELF::SHF_WRITE; 349 350 // ELF 351 BSSSection = Ctx->getELFSection(".bss", ELF::SHT_NOBITS, 352 ELF::SHF_WRITE | ELF::SHF_ALLOC); 353 354 TextSection = Ctx->getELFSection(".text", ELF::SHT_PROGBITS, 355 ELF::SHF_EXECINSTR | ELF::SHF_ALLOC); 356 357 DataSection = Ctx->getELFSection(".data", ELF::SHT_PROGBITS, 358 ELF::SHF_WRITE | ELF::SHF_ALLOC); 359 360 ReadOnlySection = 361 Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); 362 363 TLSDataSection = 364 Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS, 365 ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE); 366 367 TLSBSSSection = Ctx->getELFSection( 368 ".tbss", ELF::SHT_NOBITS, ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE); 369 370 DataRelROSection = Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS, 371 ELF::SHF_ALLOC | ELF::SHF_WRITE); 372 373 MergeableConst4Section = 374 Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS, 375 ELF::SHF_ALLOC | ELF::SHF_MERGE, 4); 376 377 MergeableConst8Section = 378 Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS, 379 ELF::SHF_ALLOC | ELF::SHF_MERGE, 8); 380 381 MergeableConst16Section = 382 Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS, 383 ELF::SHF_ALLOC | ELF::SHF_MERGE, 16); 384 385 MergeableConst32Section = 386 Ctx->getELFSection(".rodata.cst32", ELF::SHT_PROGBITS, 387 ELF::SHF_ALLOC | ELF::SHF_MERGE, 32); 388 389 // Exception Handling Sections. 390 391 // FIXME: We're emitting LSDA info into a readonly section on ELF, even though 392 // it contains relocatable pointers. In PIC mode, this is probably a big 393 // runtime hit for C++ apps. Either the contents of the LSDA need to be 394 // adjusted or this should be a data section. 395 LSDASection = Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS, 396 ELF::SHF_ALLOC); 397 398 COFFDebugSymbolsSection = nullptr; 399 COFFDebugTypesSection = nullptr; 400 401 unsigned DebugSecType = ELF::SHT_PROGBITS; 402 403 // MIPS .debug_* sections should have SHT_MIPS_DWARF section type 404 // to distinguish among sections contain DWARF and ECOFF debug formats. 405 // Sections with ECOFF debug format are obsoleted and marked by SHT_PROGBITS. 406 if (T.isMIPS()) 407 DebugSecType = ELF::SHT_MIPS_DWARF; 408 409 // Debug Info Sections. 410 DwarfAbbrevSection = 411 Ctx->getELFSection(".debug_abbrev", DebugSecType, 0); 412 DwarfInfoSection = Ctx->getELFSection(".debug_info", DebugSecType, 0); 413 DwarfLineSection = Ctx->getELFSection(".debug_line", DebugSecType, 0); 414 DwarfLineStrSection = 415 Ctx->getELFSection(".debug_line_str", DebugSecType, 416 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1); 417 DwarfFrameSection = Ctx->getELFSection(".debug_frame", DebugSecType, 0); 418 DwarfPubNamesSection = 419 Ctx->getELFSection(".debug_pubnames", DebugSecType, 0); 420 DwarfPubTypesSection = 421 Ctx->getELFSection(".debug_pubtypes", DebugSecType, 0); 422 DwarfGnuPubNamesSection = 423 Ctx->getELFSection(".debug_gnu_pubnames", DebugSecType, 0); 424 DwarfGnuPubTypesSection = 425 Ctx->getELFSection(".debug_gnu_pubtypes", DebugSecType, 0); 426 DwarfStrSection = 427 Ctx->getELFSection(".debug_str", DebugSecType, 428 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1); 429 DwarfLocSection = Ctx->getELFSection(".debug_loc", DebugSecType, 0); 430 DwarfARangesSection = 431 Ctx->getELFSection(".debug_aranges", DebugSecType, 0); 432 DwarfRangesSection = 433 Ctx->getELFSection(".debug_ranges", DebugSecType, 0); 434 DwarfMacinfoSection = 435 Ctx->getELFSection(".debug_macinfo", DebugSecType, 0); 436 DwarfMacroSection = Ctx->getELFSection(".debug_macro", DebugSecType, 0); 437 438 // DWARF5 Experimental Debug Info 439 440 // Accelerator Tables 441 DwarfDebugNamesSection = 442 Ctx->getELFSection(".debug_names", ELF::SHT_PROGBITS, 0); 443 DwarfAccelNamesSection = 444 Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0); 445 DwarfAccelObjCSection = 446 Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0); 447 DwarfAccelNamespaceSection = 448 Ctx->getELFSection(".apple_namespaces", ELF::SHT_PROGBITS, 0); 449 DwarfAccelTypesSection = 450 Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0); 451 452 // String Offset and Address Sections 453 DwarfStrOffSection = 454 Ctx->getELFSection(".debug_str_offsets", DebugSecType, 0); 455 DwarfAddrSection = Ctx->getELFSection(".debug_addr", DebugSecType, 0); 456 DwarfRnglistsSection = Ctx->getELFSection(".debug_rnglists", DebugSecType, 0); 457 DwarfLoclistsSection = Ctx->getELFSection(".debug_loclists", DebugSecType, 0); 458 459 // Fission Sections 460 DwarfInfoDWOSection = 461 Ctx->getELFSection(".debug_info.dwo", DebugSecType, ELF::SHF_EXCLUDE); 462 DwarfTypesDWOSection = 463 Ctx->getELFSection(".debug_types.dwo", DebugSecType, ELF::SHF_EXCLUDE); 464 DwarfAbbrevDWOSection = 465 Ctx->getELFSection(".debug_abbrev.dwo", DebugSecType, ELF::SHF_EXCLUDE); 466 DwarfStrDWOSection = Ctx->getELFSection( 467 ".debug_str.dwo", DebugSecType, 468 ELF::SHF_MERGE | ELF::SHF_STRINGS | ELF::SHF_EXCLUDE, 1); 469 DwarfLineDWOSection = 470 Ctx->getELFSection(".debug_line.dwo", DebugSecType, ELF::SHF_EXCLUDE); 471 DwarfLocDWOSection = 472 Ctx->getELFSection(".debug_loc.dwo", DebugSecType, ELF::SHF_EXCLUDE); 473 DwarfStrOffDWOSection = Ctx->getELFSection(".debug_str_offsets.dwo", 474 DebugSecType, ELF::SHF_EXCLUDE); 475 DwarfRnglistsDWOSection = 476 Ctx->getELFSection(".debug_rnglists.dwo", DebugSecType, ELF::SHF_EXCLUDE); 477 DwarfMacinfoDWOSection = 478 Ctx->getELFSection(".debug_macinfo.dwo", DebugSecType, ELF::SHF_EXCLUDE); 479 DwarfMacroDWOSection = 480 Ctx->getELFSection(".debug_macro.dwo", DebugSecType, ELF::SHF_EXCLUDE); 481 482 DwarfLoclistsDWOSection = 483 Ctx->getELFSection(".debug_loclists.dwo", DebugSecType, ELF::SHF_EXCLUDE); 484 485 // DWP Sections 486 DwarfCUIndexSection = 487 Ctx->getELFSection(".debug_cu_index", DebugSecType, 0); 488 DwarfTUIndexSection = 489 Ctx->getELFSection(".debug_tu_index", DebugSecType, 0); 490 491 StackMapSection = 492 Ctx->getELFSection(".llvm_stackmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); 493 494 FaultMapSection = 495 Ctx->getELFSection(".llvm_faultmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); 496 497 EHFrameSection = 498 Ctx->getELFSection(".eh_frame", EHSectionType, EHSectionFlags); 499 500 StackSizesSection = Ctx->getELFSection(".stack_sizes", ELF::SHT_PROGBITS, 0); 501 502 PseudoProbeSection = Ctx->getELFSection(".pseudo_probe", DebugSecType, 0); 503 PseudoProbeDescSection = 504 Ctx->getELFSection(".pseudo_probe_desc", DebugSecType, 0); 505 } 506 507 void MCObjectFileInfo::initCOFFMCObjectFileInfo(const Triple &T) { 508 EHFrameSection = 509 Ctx->getCOFFSection(".eh_frame", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 510 COFF::IMAGE_SCN_MEM_READ, 511 SectionKind::getData()); 512 513 // Set the `IMAGE_SCN_MEM_16BIT` flag when compiling for thumb mode. This is 514 // used to indicate to the linker that the text segment contains thumb instructions 515 // and to set the ISA selection bit for calls accordingly. 516 const bool IsThumb = T.getArch() == Triple::thumb; 517 518 CommDirectiveSupportsAlignment = true; 519 520 // COFF 521 BSSSection = Ctx->getCOFFSection( 522 ".bss", COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA | 523 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE, 524 SectionKind::getBSS()); 525 TextSection = Ctx->getCOFFSection( 526 ".text", 527 (IsThumb ? COFF::IMAGE_SCN_MEM_16BIT : (COFF::SectionCharacteristics)0) | 528 COFF::IMAGE_SCN_CNT_CODE | COFF::IMAGE_SCN_MEM_EXECUTE | 529 COFF::IMAGE_SCN_MEM_READ, 530 SectionKind::getText()); 531 DataSection = Ctx->getCOFFSection( 532 ".data", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ | 533 COFF::IMAGE_SCN_MEM_WRITE, 534 SectionKind::getData()); 535 ReadOnlySection = Ctx->getCOFFSection( 536 ".rdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, 537 SectionKind::getReadOnly()); 538 539 if (T.getArch() == Triple::x86_64 || T.getArch() == Triple::aarch64) { 540 // On Windows 64 with SEH, the LSDA is emitted into the .xdata section 541 LSDASection = nullptr; 542 } else { 543 LSDASection = Ctx->getCOFFSection(".gcc_except_table", 544 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 545 COFF::IMAGE_SCN_MEM_READ, 546 SectionKind::getReadOnly()); 547 } 548 549 // Debug info. 550 COFFDebugSymbolsSection = 551 Ctx->getCOFFSection(".debug$S", (COFF::IMAGE_SCN_MEM_DISCARDABLE | 552 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 553 COFF::IMAGE_SCN_MEM_READ), 554 SectionKind::getMetadata()); 555 COFFDebugTypesSection = 556 Ctx->getCOFFSection(".debug$T", (COFF::IMAGE_SCN_MEM_DISCARDABLE | 557 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 558 COFF::IMAGE_SCN_MEM_READ), 559 SectionKind::getMetadata()); 560 COFFGlobalTypeHashesSection = Ctx->getCOFFSection( 561 ".debug$H", 562 (COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 563 COFF::IMAGE_SCN_MEM_READ), 564 SectionKind::getMetadata()); 565 566 DwarfAbbrevSection = Ctx->getCOFFSection( 567 ".debug_abbrev", 568 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 569 COFF::IMAGE_SCN_MEM_READ, 570 SectionKind::getMetadata(), "section_abbrev"); 571 DwarfInfoSection = Ctx->getCOFFSection( 572 ".debug_info", 573 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 574 COFF::IMAGE_SCN_MEM_READ, 575 SectionKind::getMetadata(), "section_info"); 576 DwarfLineSection = Ctx->getCOFFSection( 577 ".debug_line", 578 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 579 COFF::IMAGE_SCN_MEM_READ, 580 SectionKind::getMetadata(), "section_line"); 581 DwarfLineStrSection = Ctx->getCOFFSection( 582 ".debug_line_str", 583 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 584 COFF::IMAGE_SCN_MEM_READ, 585 SectionKind::getMetadata(), "section_line_str"); 586 DwarfFrameSection = Ctx->getCOFFSection( 587 ".debug_frame", 588 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 589 COFF::IMAGE_SCN_MEM_READ, 590 SectionKind::getMetadata()); 591 DwarfPubNamesSection = Ctx->getCOFFSection( 592 ".debug_pubnames", 593 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 594 COFF::IMAGE_SCN_MEM_READ, 595 SectionKind::getMetadata()); 596 DwarfPubTypesSection = Ctx->getCOFFSection( 597 ".debug_pubtypes", 598 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 599 COFF::IMAGE_SCN_MEM_READ, 600 SectionKind::getMetadata()); 601 DwarfGnuPubNamesSection = Ctx->getCOFFSection( 602 ".debug_gnu_pubnames", 603 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 604 COFF::IMAGE_SCN_MEM_READ, 605 SectionKind::getMetadata()); 606 DwarfGnuPubTypesSection = Ctx->getCOFFSection( 607 ".debug_gnu_pubtypes", 608 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 609 COFF::IMAGE_SCN_MEM_READ, 610 SectionKind::getMetadata()); 611 DwarfStrSection = Ctx->getCOFFSection( 612 ".debug_str", 613 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 614 COFF::IMAGE_SCN_MEM_READ, 615 SectionKind::getMetadata(), "info_string"); 616 DwarfStrOffSection = Ctx->getCOFFSection( 617 ".debug_str_offsets", 618 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 619 COFF::IMAGE_SCN_MEM_READ, 620 SectionKind::getMetadata(), "section_str_off"); 621 DwarfLocSection = Ctx->getCOFFSection( 622 ".debug_loc", 623 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 624 COFF::IMAGE_SCN_MEM_READ, 625 SectionKind::getMetadata(), "section_debug_loc"); 626 DwarfLoclistsSection = Ctx->getCOFFSection( 627 ".debug_loclists", 628 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 629 COFF::IMAGE_SCN_MEM_READ, 630 SectionKind::getMetadata(), "section_debug_loclists"); 631 DwarfARangesSection = Ctx->getCOFFSection( 632 ".debug_aranges", 633 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 634 COFF::IMAGE_SCN_MEM_READ, 635 SectionKind::getMetadata()); 636 DwarfRangesSection = Ctx->getCOFFSection( 637 ".debug_ranges", 638 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 639 COFF::IMAGE_SCN_MEM_READ, 640 SectionKind::getMetadata(), "debug_range"); 641 DwarfRnglistsSection = Ctx->getCOFFSection( 642 ".debug_rnglists", 643 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 644 COFF::IMAGE_SCN_MEM_READ, 645 SectionKind::getMetadata(), "debug_rnglists"); 646 DwarfMacinfoSection = Ctx->getCOFFSection( 647 ".debug_macinfo", 648 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 649 COFF::IMAGE_SCN_MEM_READ, 650 SectionKind::getMetadata(), "debug_macinfo"); 651 DwarfMacroSection = Ctx->getCOFFSection( 652 ".debug_macro", 653 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 654 COFF::IMAGE_SCN_MEM_READ, 655 SectionKind::getMetadata(), "debug_macro"); 656 DwarfMacinfoDWOSection = Ctx->getCOFFSection( 657 ".debug_macinfo.dwo", 658 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 659 COFF::IMAGE_SCN_MEM_READ, 660 SectionKind::getMetadata(), "debug_macinfo.dwo"); 661 DwarfMacroDWOSection = Ctx->getCOFFSection( 662 ".debug_macro.dwo", 663 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 664 COFF::IMAGE_SCN_MEM_READ, 665 SectionKind::getMetadata(), "debug_macro.dwo"); 666 DwarfInfoDWOSection = Ctx->getCOFFSection( 667 ".debug_info.dwo", 668 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 669 COFF::IMAGE_SCN_MEM_READ, 670 SectionKind::getMetadata(), "section_info_dwo"); 671 DwarfTypesDWOSection = Ctx->getCOFFSection( 672 ".debug_types.dwo", 673 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 674 COFF::IMAGE_SCN_MEM_READ, 675 SectionKind::getMetadata(), "section_types_dwo"); 676 DwarfAbbrevDWOSection = Ctx->getCOFFSection( 677 ".debug_abbrev.dwo", 678 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 679 COFF::IMAGE_SCN_MEM_READ, 680 SectionKind::getMetadata(), "section_abbrev_dwo"); 681 DwarfStrDWOSection = Ctx->getCOFFSection( 682 ".debug_str.dwo", 683 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 684 COFF::IMAGE_SCN_MEM_READ, 685 SectionKind::getMetadata(), "skel_string"); 686 DwarfLineDWOSection = Ctx->getCOFFSection( 687 ".debug_line.dwo", 688 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 689 COFF::IMAGE_SCN_MEM_READ, 690 SectionKind::getMetadata()); 691 DwarfLocDWOSection = Ctx->getCOFFSection( 692 ".debug_loc.dwo", 693 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 694 COFF::IMAGE_SCN_MEM_READ, 695 SectionKind::getMetadata(), "skel_loc"); 696 DwarfStrOffDWOSection = Ctx->getCOFFSection( 697 ".debug_str_offsets.dwo", 698 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 699 COFF::IMAGE_SCN_MEM_READ, 700 SectionKind::getMetadata(), "section_str_off_dwo"); 701 DwarfAddrSection = Ctx->getCOFFSection( 702 ".debug_addr", 703 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 704 COFF::IMAGE_SCN_MEM_READ, 705 SectionKind::getMetadata(), "addr_sec"); 706 DwarfCUIndexSection = Ctx->getCOFFSection( 707 ".debug_cu_index", 708 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 709 COFF::IMAGE_SCN_MEM_READ, 710 SectionKind::getMetadata()); 711 DwarfTUIndexSection = Ctx->getCOFFSection( 712 ".debug_tu_index", 713 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 714 COFF::IMAGE_SCN_MEM_READ, 715 SectionKind::getMetadata()); 716 DwarfDebugNamesSection = Ctx->getCOFFSection( 717 ".debug_names", 718 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 719 COFF::IMAGE_SCN_MEM_READ, 720 SectionKind::getMetadata(), "debug_names_begin"); 721 DwarfAccelNamesSection = Ctx->getCOFFSection( 722 ".apple_names", 723 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 724 COFF::IMAGE_SCN_MEM_READ, 725 SectionKind::getMetadata(), "names_begin"); 726 DwarfAccelNamespaceSection = Ctx->getCOFFSection( 727 ".apple_namespaces", 728 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 729 COFF::IMAGE_SCN_MEM_READ, 730 SectionKind::getMetadata(), "namespac_begin"); 731 DwarfAccelTypesSection = Ctx->getCOFFSection( 732 ".apple_types", 733 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 734 COFF::IMAGE_SCN_MEM_READ, 735 SectionKind::getMetadata(), "types_begin"); 736 DwarfAccelObjCSection = Ctx->getCOFFSection( 737 ".apple_objc", 738 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 739 COFF::IMAGE_SCN_MEM_READ, 740 SectionKind::getMetadata(), "objc_begin"); 741 742 DrectveSection = Ctx->getCOFFSection( 743 ".drectve", COFF::IMAGE_SCN_LNK_INFO | COFF::IMAGE_SCN_LNK_REMOVE, 744 SectionKind::getMetadata()); 745 746 PDataSection = Ctx->getCOFFSection( 747 ".pdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, 748 SectionKind::getData()); 749 750 XDataSection = Ctx->getCOFFSection( 751 ".xdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, 752 SectionKind::getData()); 753 754 SXDataSection = Ctx->getCOFFSection(".sxdata", COFF::IMAGE_SCN_LNK_INFO, 755 SectionKind::getMetadata()); 756 757 GEHContSection = Ctx->getCOFFSection(".gehcont$y", 758 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 759 COFF::IMAGE_SCN_MEM_READ, 760 SectionKind::getMetadata()); 761 762 GFIDsSection = Ctx->getCOFFSection(".gfids$y", 763 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 764 COFF::IMAGE_SCN_MEM_READ, 765 SectionKind::getMetadata()); 766 767 GIATsSection = Ctx->getCOFFSection(".giats$y", 768 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 769 COFF::IMAGE_SCN_MEM_READ, 770 SectionKind::getMetadata()); 771 772 GLJMPSection = Ctx->getCOFFSection(".gljmp$y", 773 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 774 COFF::IMAGE_SCN_MEM_READ, 775 SectionKind::getMetadata()); 776 777 TLSDataSection = Ctx->getCOFFSection( 778 ".tls$", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ | 779 COFF::IMAGE_SCN_MEM_WRITE, 780 SectionKind::getData()); 781 782 StackMapSection = Ctx->getCOFFSection(".llvm_stackmaps", 783 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 784 COFF::IMAGE_SCN_MEM_READ, 785 SectionKind::getReadOnly()); 786 } 787 788 void MCObjectFileInfo::initWasmMCObjectFileInfo(const Triple &T) { 789 TextSection = Ctx->getWasmSection(".text", SectionKind::getText()); 790 DataSection = Ctx->getWasmSection(".data", SectionKind::getData()); 791 792 DwarfLineSection = 793 Ctx->getWasmSection(".debug_line", SectionKind::getMetadata()); 794 DwarfLineStrSection = 795 Ctx->getWasmSection(".debug_line_str", SectionKind::getMetadata(), 796 wasm::WASM_SEG_FLAG_STRINGS); 797 DwarfStrSection = Ctx->getWasmSection( 798 ".debug_str", SectionKind::getMetadata(), wasm::WASM_SEG_FLAG_STRINGS); 799 DwarfLocSection = 800 Ctx->getWasmSection(".debug_loc", SectionKind::getMetadata()); 801 DwarfAbbrevSection = 802 Ctx->getWasmSection(".debug_abbrev", SectionKind::getMetadata()); 803 DwarfARangesSection = Ctx->getWasmSection(".debug_aranges", SectionKind::getMetadata()); 804 DwarfRangesSection = 805 Ctx->getWasmSection(".debug_ranges", SectionKind::getMetadata()); 806 DwarfMacinfoSection = 807 Ctx->getWasmSection(".debug_macinfo", SectionKind::getMetadata()); 808 DwarfMacroSection = 809 Ctx->getWasmSection(".debug_macro", SectionKind::getMetadata()); 810 DwarfCUIndexSection = Ctx->getWasmSection(".debug_cu_index", SectionKind::getMetadata()); 811 DwarfTUIndexSection = Ctx->getWasmSection(".debug_tu_index", SectionKind::getMetadata()); 812 DwarfInfoSection = 813 Ctx->getWasmSection(".debug_info", SectionKind::getMetadata()); 814 DwarfFrameSection = Ctx->getWasmSection(".debug_frame", SectionKind::getMetadata()); 815 DwarfPubNamesSection = Ctx->getWasmSection(".debug_pubnames", SectionKind::getMetadata()); 816 DwarfPubTypesSection = Ctx->getWasmSection(".debug_pubtypes", SectionKind::getMetadata()); 817 DwarfGnuPubNamesSection = 818 Ctx->getWasmSection(".debug_gnu_pubnames", SectionKind::getMetadata()); 819 DwarfGnuPubTypesSection = 820 Ctx->getWasmSection(".debug_gnu_pubtypes", SectionKind::getMetadata()); 821 822 DwarfDebugNamesSection = 823 Ctx->getWasmSection(".debug_names", SectionKind::getMetadata()); 824 DwarfStrOffSection = 825 Ctx->getWasmSection(".debug_str_offsets", SectionKind::getMetadata()); 826 DwarfAddrSection = 827 Ctx->getWasmSection(".debug_addr", SectionKind::getMetadata()); 828 DwarfRnglistsSection = 829 Ctx->getWasmSection(".debug_rnglists", SectionKind::getMetadata()); 830 DwarfLoclistsSection = 831 Ctx->getWasmSection(".debug_loclists", SectionKind::getMetadata()); 832 833 // Fission Sections 834 DwarfInfoDWOSection = 835 Ctx->getWasmSection(".debug_info.dwo", SectionKind::getMetadata()); 836 DwarfTypesDWOSection = 837 Ctx->getWasmSection(".debug_types.dwo", SectionKind::getMetadata()); 838 DwarfAbbrevDWOSection = 839 Ctx->getWasmSection(".debug_abbrev.dwo", SectionKind::getMetadata()); 840 DwarfStrDWOSection = 841 Ctx->getWasmSection(".debug_str.dwo", SectionKind::getMetadata(), 842 wasm::WASM_SEG_FLAG_STRINGS); 843 DwarfLineDWOSection = 844 Ctx->getWasmSection(".debug_line.dwo", SectionKind::getMetadata()); 845 DwarfLocDWOSection = 846 Ctx->getWasmSection(".debug_loc.dwo", SectionKind::getMetadata()); 847 DwarfStrOffDWOSection = 848 Ctx->getWasmSection(".debug_str_offsets.dwo", SectionKind::getMetadata()); 849 DwarfRnglistsDWOSection = 850 Ctx->getWasmSection(".debug_rnglists.dwo", SectionKind::getMetadata()); 851 DwarfMacinfoDWOSection = 852 Ctx->getWasmSection(".debug_macinfo.dwo", SectionKind::getMetadata()); 853 DwarfMacroDWOSection = 854 Ctx->getWasmSection(".debug_macro.dwo", SectionKind::getMetadata()); 855 856 DwarfLoclistsDWOSection = 857 Ctx->getWasmSection(".debug_loclists.dwo", SectionKind::getMetadata()); 858 859 // DWP Sections 860 DwarfCUIndexSection = 861 Ctx->getWasmSection(".debug_cu_index", SectionKind::getMetadata()); 862 DwarfTUIndexSection = 863 Ctx->getWasmSection(".debug_tu_index", SectionKind::getMetadata()); 864 865 // Wasm use data section for LSDA. 866 // TODO Consider putting each function's exception table in a separate 867 // section, as in -function-sections, to facilitate lld's --gc-section. 868 LSDASection = Ctx->getWasmSection(".rodata.gcc_except_table", 869 SectionKind::getReadOnlyWithRel()); 870 871 // TODO: Define more sections. 872 } 873 874 void MCObjectFileInfo::initXCOFFMCObjectFileInfo(const Triple &T) { 875 // The default csect for program code. Functions without a specified section 876 // get placed into this csect. The choice of csect name is not a property of 877 // the ABI or object file format. For example, the XL compiler uses an unnamed 878 // csect for program code. 879 TextSection = Ctx->getXCOFFSection( 880 ".text", SectionKind::getText(), 881 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_PR, XCOFF::XTY_SD), 882 /* MultiSymbolsAllowed*/ true); 883 884 DataSection = Ctx->getXCOFFSection( 885 ".data", SectionKind::getData(), 886 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_RW, XCOFF::XTY_SD), 887 /* MultiSymbolsAllowed*/ true); 888 889 ReadOnlySection = Ctx->getXCOFFSection( 890 ".rodata", SectionKind::getReadOnly(), 891 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_RO, XCOFF::XTY_SD), 892 /* MultiSymbolsAllowed*/ true); 893 894 TLSDataSection = Ctx->getXCOFFSection( 895 ".tdata", SectionKind::getThreadData(), 896 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_TL, XCOFF::XTY_SD), 897 /* MultiSymbolsAllowed*/ true); 898 899 TOCBaseSection = Ctx->getXCOFFSection( 900 "TOC", SectionKind::getData(), 901 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_TC0, 902 XCOFF::XTY_SD)); 903 904 // The TOC-base always has 0 size, but 4 byte alignment. 905 TOCBaseSection->setAlignment(Align(4)); 906 907 LSDASection = Ctx->getXCOFFSection( 908 ".gcc_except_table", SectionKind::getReadOnly(), 909 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_RO, 910 XCOFF::XTY_SD)); 911 912 CompactUnwindSection = Ctx->getXCOFFSection( 913 ".eh_info_table", SectionKind::getData(), 914 XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_RW, 915 XCOFF::XTY_SD)); 916 917 // DWARF sections for XCOFF are not csects. They are special STYP_DWARF 918 // sections, and the individual DWARF sections are distinguished by their 919 // section subtype. 920 DwarfAbbrevSection = Ctx->getXCOFFSection( 921 ".dwabrev", SectionKind::getMetadata(), /* CsectProperties */ None, 922 /* MultiSymbolsAllowed */ true, ".dwabrev", XCOFF::SSUBTYP_DWABREV); 923 924 DwarfInfoSection = Ctx->getXCOFFSection( 925 ".dwinfo", SectionKind::getMetadata(), /* CsectProperties */ None, 926 /* MultiSymbolsAllowed */ true, ".dwinfo", XCOFF::SSUBTYP_DWINFO); 927 928 DwarfLineSection = Ctx->getXCOFFSection( 929 ".dwline", SectionKind::getMetadata(), /* CsectProperties */ None, 930 /* MultiSymbolsAllowed */ true, ".dwline", XCOFF::SSUBTYP_DWLINE); 931 932 DwarfFrameSection = Ctx->getXCOFFSection( 933 ".dwframe", SectionKind::getMetadata(), /* CsectProperties */ None, 934 /* MultiSymbolsAllowed */ true, ".dwframe", XCOFF::SSUBTYP_DWFRAME); 935 936 DwarfPubNamesSection = Ctx->getXCOFFSection( 937 ".dwpbnms", SectionKind::getMetadata(), /* CsectProperties */ None, 938 /* MultiSymbolsAllowed */ true, ".dwpbnms", XCOFF::SSUBTYP_DWPBNMS); 939 940 DwarfPubTypesSection = Ctx->getXCOFFSection( 941 ".dwpbtyp", SectionKind::getMetadata(), /* CsectProperties */ None, 942 /* MultiSymbolsAllowed */ true, ".dwpbtyp", XCOFF::SSUBTYP_DWPBTYP); 943 944 DwarfStrSection = Ctx->getXCOFFSection( 945 ".dwstr", SectionKind::getMetadata(), /* CsectProperties */ None, 946 /* MultiSymbolsAllowed */ true, ".dwstr", XCOFF::SSUBTYP_DWSTR); 947 948 DwarfLocSection = Ctx->getXCOFFSection( 949 ".dwloc", SectionKind::getMetadata(), /* CsectProperties */ None, 950 /* MultiSymbolsAllowed */ true, ".dwloc", XCOFF::SSUBTYP_DWLOC); 951 952 DwarfARangesSection = Ctx->getXCOFFSection( 953 ".dwarnge", SectionKind::getMetadata(), /* CsectProperties */ None, 954 /* MultiSymbolsAllowed */ true, ".dwarnge", XCOFF::SSUBTYP_DWARNGE); 955 956 DwarfRangesSection = Ctx->getXCOFFSection( 957 ".dwrnges", SectionKind::getMetadata(), /* CsectProperties */ None, 958 /* MultiSymbolsAllowed */ true, ".dwrnges", XCOFF::SSUBTYP_DWRNGES); 959 960 DwarfMacinfoSection = Ctx->getXCOFFSection( 961 ".dwmac", SectionKind::getMetadata(), /* CsectProperties */ None, 962 /* MultiSymbolsAllowed */ true, ".dwmac", XCOFF::SSUBTYP_DWMAC); 963 } 964 965 void MCObjectFileInfo::initMCObjectFileInfo(MCContext &MCCtx, bool PIC, 966 bool LargeCodeModel) { 967 PositionIndependent = PIC; 968 Ctx = &MCCtx; 969 970 // Common. 971 CommDirectiveSupportsAlignment = true; 972 SupportsWeakOmittedEHFrame = true; 973 SupportsCompactUnwindWithoutEHFrame = false; 974 OmitDwarfIfHaveCompactUnwind = false; 975 976 FDECFIEncoding = dwarf::DW_EH_PE_absptr; 977 978 CompactUnwindDwarfEHFrameOnly = 0; 979 980 EHFrameSection = nullptr; // Created on demand. 981 CompactUnwindSection = nullptr; // Used only by selected targets. 982 DwarfAccelNamesSection = nullptr; // Used only by selected targets. 983 DwarfAccelObjCSection = nullptr; // Used only by selected targets. 984 DwarfAccelNamespaceSection = nullptr; // Used only by selected targets. 985 DwarfAccelTypesSection = nullptr; // Used only by selected targets. 986 987 Triple TheTriple = Ctx->getTargetTriple(); 988 switch (Ctx->getObjectFileType()) { 989 case MCContext::IsMachO: 990 initMachOMCObjectFileInfo(TheTriple); 991 break; 992 case MCContext::IsCOFF: 993 initCOFFMCObjectFileInfo(TheTriple); 994 break; 995 case MCContext::IsELF: 996 initELFMCObjectFileInfo(TheTriple, LargeCodeModel); 997 break; 998 case MCContext::IsWasm: 999 initWasmMCObjectFileInfo(TheTriple); 1000 break; 1001 case MCContext::IsXCOFF: 1002 initXCOFFMCObjectFileInfo(TheTriple); 1003 break; 1004 } 1005 } 1006 1007 MCSection *MCObjectFileInfo::getDwarfComdatSection(const char *Name, 1008 uint64_t Hash) const { 1009 switch (Ctx->getTargetTriple().getObjectFormat()) { 1010 case Triple::ELF: 1011 return Ctx->getELFSection(Name, ELF::SHT_PROGBITS, ELF::SHF_GROUP, 0, 1012 utostr(Hash), /*IsComdat=*/true); 1013 case Triple::Wasm: 1014 return Ctx->getWasmSection(Name, SectionKind::getMetadata(), 0, 1015 utostr(Hash), MCContext::GenericSectionID); 1016 case Triple::MachO: 1017 case Triple::COFF: 1018 case Triple::GOFF: 1019 case Triple::XCOFF: 1020 case Triple::UnknownObjectFormat: 1021 report_fatal_error("Cannot get DWARF comdat section for this object file " 1022 "format: not implemented."); 1023 break; 1024 } 1025 llvm_unreachable("Unknown ObjectFormatType"); 1026 } 1027 1028 MCSection * 1029 MCObjectFileInfo::getStackSizesSection(const MCSection &TextSec) const { 1030 if (Ctx->getObjectFileType() != MCContext::IsELF) 1031 return StackSizesSection; 1032 1033 const MCSectionELF &ElfSec = static_cast<const MCSectionELF &>(TextSec); 1034 unsigned Flags = ELF::SHF_LINK_ORDER; 1035 StringRef GroupName; 1036 if (const MCSymbol *Group = ElfSec.getGroup()) { 1037 GroupName = Group->getName(); 1038 Flags |= ELF::SHF_GROUP; 1039 } 1040 1041 return Ctx->getELFSection(".stack_sizes", ELF::SHT_PROGBITS, Flags, 0, 1042 GroupName, true, ElfSec.getUniqueID(), 1043 cast<MCSymbolELF>(TextSec.getBeginSymbol())); 1044 } 1045 1046 MCSection * 1047 MCObjectFileInfo::getBBAddrMapSection(const MCSection &TextSec) const { 1048 if (Ctx->getObjectFileType() != MCContext::IsELF) 1049 return nullptr; 1050 1051 const MCSectionELF &ElfSec = static_cast<const MCSectionELF &>(TextSec); 1052 unsigned Flags = ELF::SHF_LINK_ORDER; 1053 StringRef GroupName; 1054 if (const MCSymbol *Group = ElfSec.getGroup()) { 1055 GroupName = Group->getName(); 1056 Flags |= ELF::SHF_GROUP; 1057 } 1058 1059 // Use the text section's begin symbol and unique ID to create a separate 1060 // .llvm_bb_addr_map section associated with every unique text section. 1061 return Ctx->getELFSection(".llvm_bb_addr_map", ELF::SHT_LLVM_BB_ADDR_MAP, 1062 Flags, 0, GroupName, true, ElfSec.getUniqueID(), 1063 cast<MCSymbolELF>(TextSec.getBeginSymbol())); 1064 } 1065 1066 MCSection * 1067 MCObjectFileInfo::getPseudoProbeSection(const MCSection *TextSec) const { 1068 if (Ctx->getObjectFileType() == MCContext::IsELF) { 1069 const auto *ElfSec = static_cast<const MCSectionELF *>(TextSec); 1070 // Create a separate section for probes that comes with a comdat function. 1071 if (const MCSymbol *Group = ElfSec->getGroup()) { 1072 auto *S = static_cast<MCSectionELF *>(PseudoProbeSection); 1073 auto Flags = S->getFlags() | ELF::SHF_GROUP; 1074 return Ctx->getELFSection(S->getName(), S->getType(), Flags, 1075 S->getEntrySize(), Group->getName(), 1076 /*IsComdat=*/true); 1077 } 1078 } 1079 return PseudoProbeSection; 1080 } 1081 1082 MCSection * 1083 MCObjectFileInfo::getPseudoProbeDescSection(StringRef FuncName) const { 1084 if (Ctx->getObjectFileType() == MCContext::IsELF) { 1085 // Create a separate comdat group for each function's descriptor in order 1086 // for the linker to deduplicate. The duplication, must be from different 1087 // tranlation unit, can come from: 1088 // 1. Inline functions defined in header files; 1089 // 2. ThinLTO imported funcions; 1090 // 3. Weak-linkage definitions. 1091 // Use a concatenation of the section name and the function name as the 1092 // group name so that descriptor-only groups won't be folded with groups of 1093 // code. 1094 if (Ctx->getTargetTriple().supportsCOMDAT() && !FuncName.empty()) { 1095 auto *S = static_cast<MCSectionELF *>(PseudoProbeDescSection); 1096 auto Flags = S->getFlags() | ELF::SHF_GROUP; 1097 return Ctx->getELFSection(S->getName(), S->getType(), Flags, 1098 S->getEntrySize(), 1099 S->getName() + "_" + FuncName, 1100 /*IsComdat=*/true); 1101 } 1102 } 1103 return PseudoProbeDescSection; 1104 } 1105
Indexes created Tue Jun 09 00:24:00 UTC 2026