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