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