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::x86_64: 321 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | 322 (Large ? dwarf::DW_EH_PE_sdata8 : dwarf::DW_EH_PE_sdata4); 323 break; 324 case Triple::bpfel: 325 case Triple::bpfeb: 326 FDECFIEncoding = dwarf::DW_EH_PE_sdata8; 327 break; 328 case Triple::hexagon: 329 FDECFIEncoding = 330 PositionIndependent ? dwarf::DW_EH_PE_pcrel : dwarf::DW_EH_PE_absptr; 331 break; 332 default: 333 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 334 break; 335 } 336 337 unsigned EHSectionType = T.getArch() == Triple::x86_64 338 ? ELF::SHT_X86_64_UNWIND 339 : ELF::SHT_PROGBITS; 340 341 // Solaris requires different flags for .eh_frame to seemingly every other 342 // platform. 343 unsigned EHSectionFlags = ELF::SHF_ALLOC; 344 if (T.isOSSolaris() && T.getArch() != Triple::x86_64) 345 EHSectionFlags |= ELF::SHF_WRITE; 346 347 // ELF 348 BSSSection = Ctx->getELFSection(".bss", ELF::SHT_NOBITS, 349 ELF::SHF_WRITE | ELF::SHF_ALLOC); 350 351 TextSection = Ctx->getELFSection(".text", ELF::SHT_PROGBITS, 352 ELF::SHF_EXECINSTR | ELF::SHF_ALLOC); 353 354 DataSection = Ctx->getELFSection(".data", ELF::SHT_PROGBITS, 355 ELF::SHF_WRITE | ELF::SHF_ALLOC); 356 357 ReadOnlySection = 358 Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); 359 360 TLSDataSection = 361 Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS, 362 ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE); 363 364 TLSBSSSection = Ctx->getELFSection( 365 ".tbss", ELF::SHT_NOBITS, ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE); 366 367 DataRelROSection = Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS, 368 ELF::SHF_ALLOC | ELF::SHF_WRITE); 369 370 MergeableConst4Section = 371 Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS, 372 ELF::SHF_ALLOC | ELF::SHF_MERGE, 4, ""); 373 374 MergeableConst8Section = 375 Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS, 376 ELF::SHF_ALLOC | ELF::SHF_MERGE, 8, ""); 377 378 MergeableConst16Section = 379 Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS, 380 ELF::SHF_ALLOC | ELF::SHF_MERGE, 16, ""); 381 382 MergeableConst32Section = 383 Ctx->getELFSection(".rodata.cst32", ELF::SHT_PROGBITS, 384 ELF::SHF_ALLOC | ELF::SHF_MERGE, 32, ""); 385 386 // Exception Handling Sections. 387 388 // FIXME: We're emitting LSDA info into a readonly section on ELF, even though 389 // it contains relocatable pointers. In PIC mode, this is probably a big 390 // runtime hit for C++ apps. Either the contents of the LSDA need to be 391 // adjusted or this should be a data section. 392 LSDASection = Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS, 393 ELF::SHF_ALLOC); 394 395 COFFDebugSymbolsSection = nullptr; 396 COFFDebugTypesSection = nullptr; 397 398 unsigned DebugSecType = ELF::SHT_PROGBITS; 399 400 // MIPS .debug_* sections should have SHT_MIPS_DWARF section type 401 // to distinguish among sections contain DWARF and ECOFF debug formats. 402 // Sections with ECOFF debug format are obsoleted and marked by SHT_PROGBITS. 403 if (T.isMIPS()) 404 DebugSecType = ELF::SHT_MIPS_DWARF; 405 406 // Debug Info Sections. 407 DwarfAbbrevSection = 408 Ctx->getELFSection(".debug_abbrev", DebugSecType, 0); 409 DwarfInfoSection = Ctx->getELFSection(".debug_info", DebugSecType, 0); 410 DwarfLineSection = Ctx->getELFSection(".debug_line", DebugSecType, 0); 411 DwarfLineStrSection = 412 Ctx->getELFSection(".debug_line_str", DebugSecType, 413 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, ""); 414 DwarfFrameSection = Ctx->getELFSection(".debug_frame", DebugSecType, 0); 415 DwarfPubNamesSection = 416 Ctx->getELFSection(".debug_pubnames", DebugSecType, 0); 417 DwarfPubTypesSection = 418 Ctx->getELFSection(".debug_pubtypes", DebugSecType, 0); 419 DwarfGnuPubNamesSection = 420 Ctx->getELFSection(".debug_gnu_pubnames", DebugSecType, 0); 421 DwarfGnuPubTypesSection = 422 Ctx->getELFSection(".debug_gnu_pubtypes", DebugSecType, 0); 423 DwarfStrSection = 424 Ctx->getELFSection(".debug_str", DebugSecType, 425 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, ""); 426 DwarfLocSection = Ctx->getELFSection(".debug_loc", DebugSecType, 0); 427 DwarfARangesSection = 428 Ctx->getELFSection(".debug_aranges", DebugSecType, 0); 429 DwarfRangesSection = 430 Ctx->getELFSection(".debug_ranges", DebugSecType, 0); 431 DwarfMacinfoSection = 432 Ctx->getELFSection(".debug_macinfo", DebugSecType, 0); 433 DwarfMacroSection = Ctx->getELFSection(".debug_macro", DebugSecType, 0); 434 435 // DWARF5 Experimental Debug Info 436 437 // Accelerator Tables 438 DwarfDebugNamesSection = 439 Ctx->getELFSection(".debug_names", ELF::SHT_PROGBITS, 0); 440 DwarfAccelNamesSection = 441 Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0); 442 DwarfAccelObjCSection = 443 Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0); 444 DwarfAccelNamespaceSection = 445 Ctx->getELFSection(".apple_namespaces", ELF::SHT_PROGBITS, 0); 446 DwarfAccelTypesSection = 447 Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0); 448 449 // String Offset and Address Sections 450 DwarfStrOffSection = 451 Ctx->getELFSection(".debug_str_offsets", DebugSecType, 0); 452 DwarfAddrSection = Ctx->getELFSection(".debug_addr", DebugSecType, 0); 453 DwarfRnglistsSection = Ctx->getELFSection(".debug_rnglists", DebugSecType, 0); 454 DwarfLoclistsSection = Ctx->getELFSection(".debug_loclists", DebugSecType, 0); 455 456 // Fission Sections 457 DwarfInfoDWOSection = 458 Ctx->getELFSection(".debug_info.dwo", DebugSecType, ELF::SHF_EXCLUDE); 459 DwarfTypesDWOSection = 460 Ctx->getELFSection(".debug_types.dwo", DebugSecType, ELF::SHF_EXCLUDE); 461 DwarfAbbrevDWOSection = 462 Ctx->getELFSection(".debug_abbrev.dwo", DebugSecType, ELF::SHF_EXCLUDE); 463 DwarfStrDWOSection = Ctx->getELFSection( 464 ".debug_str.dwo", DebugSecType, 465 ELF::SHF_MERGE | ELF::SHF_STRINGS | ELF::SHF_EXCLUDE, 1, ""); 466 DwarfLineDWOSection = 467 Ctx->getELFSection(".debug_line.dwo", DebugSecType, ELF::SHF_EXCLUDE); 468 DwarfLocDWOSection = 469 Ctx->getELFSection(".debug_loc.dwo", DebugSecType, ELF::SHF_EXCLUDE); 470 DwarfStrOffDWOSection = Ctx->getELFSection(".debug_str_offsets.dwo", 471 DebugSecType, ELF::SHF_EXCLUDE); 472 DwarfRnglistsDWOSection = 473 Ctx->getELFSection(".debug_rnglists.dwo", DebugSecType, ELF::SHF_EXCLUDE); 474 DwarfMacinfoDWOSection = 475 Ctx->getELFSection(".debug_macinfo.dwo", DebugSecType, ELF::SHF_EXCLUDE); 476 DwarfMacroDWOSection = 477 Ctx->getELFSection(".debug_macro.dwo", DebugSecType, ELF::SHF_EXCLUDE); 478 479 DwarfLoclistsDWOSection = 480 Ctx->getELFSection(".debug_loclists.dwo", DebugSecType, ELF::SHF_EXCLUDE); 481 482 // DWP Sections 483 DwarfCUIndexSection = 484 Ctx->getELFSection(".debug_cu_index", DebugSecType, 0); 485 DwarfTUIndexSection = 486 Ctx->getELFSection(".debug_tu_index", DebugSecType, 0); 487 488 StackMapSection = 489 Ctx->getELFSection(".llvm_stackmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); 490 491 FaultMapSection = 492 Ctx->getELFSection(".llvm_faultmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); 493 494 EHFrameSection = 495 Ctx->getELFSection(".eh_frame", EHSectionType, EHSectionFlags); 496 497 StackSizesSection = Ctx->getELFSection(".stack_sizes", ELF::SHT_PROGBITS, 0); 498 } 499 500 void MCObjectFileInfo::initCOFFMCObjectFileInfo(const Triple &T) { 501 EHFrameSection = 502 Ctx->getCOFFSection(".eh_frame", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 503 COFF::IMAGE_SCN_MEM_READ, 504 SectionKind::getData()); 505 506 // Set the `IMAGE_SCN_MEM_16BIT` flag when compiling for thumb mode. This is 507 // used to indicate to the linker that the text segment contains thumb instructions 508 // and to set the ISA selection bit for calls accordingly. 509 const bool IsThumb = T.getArch() == Triple::thumb; 510 511 CommDirectiveSupportsAlignment = true; 512 513 // COFF 514 BSSSection = Ctx->getCOFFSection( 515 ".bss", COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA | 516 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE, 517 SectionKind::getBSS()); 518 TextSection = Ctx->getCOFFSection( 519 ".text", 520 (IsThumb ? COFF::IMAGE_SCN_MEM_16BIT : (COFF::SectionCharacteristics)0) | 521 COFF::IMAGE_SCN_CNT_CODE | COFF::IMAGE_SCN_MEM_EXECUTE | 522 COFF::IMAGE_SCN_MEM_READ, 523 SectionKind::getText()); 524 DataSection = Ctx->getCOFFSection( 525 ".data", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ | 526 COFF::IMAGE_SCN_MEM_WRITE, 527 SectionKind::getData()); 528 ReadOnlySection = Ctx->getCOFFSection( 529 ".rdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, 530 SectionKind::getReadOnly()); 531 532 if (T.getArch() == Triple::x86_64 || T.getArch() == Triple::aarch64) { 533 // On Windows 64 with SEH, the LSDA is emitted into the .xdata section 534 LSDASection = nullptr; 535 } else { 536 LSDASection = Ctx->getCOFFSection(".gcc_except_table", 537 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 538 COFF::IMAGE_SCN_MEM_READ, 539 SectionKind::getReadOnly()); 540 } 541 542 // Debug info. 543 COFFDebugSymbolsSection = 544 Ctx->getCOFFSection(".debug$S", (COFF::IMAGE_SCN_MEM_DISCARDABLE | 545 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 546 COFF::IMAGE_SCN_MEM_READ), 547 SectionKind::getMetadata()); 548 COFFDebugTypesSection = 549 Ctx->getCOFFSection(".debug$T", (COFF::IMAGE_SCN_MEM_DISCARDABLE | 550 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 551 COFF::IMAGE_SCN_MEM_READ), 552 SectionKind::getMetadata()); 553 COFFGlobalTypeHashesSection = Ctx->getCOFFSection( 554 ".debug$H", 555 (COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 556 COFF::IMAGE_SCN_MEM_READ), 557 SectionKind::getMetadata()); 558 559 DwarfAbbrevSection = Ctx->getCOFFSection( 560 ".debug_abbrev", 561 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 562 COFF::IMAGE_SCN_MEM_READ, 563 SectionKind::getMetadata(), "section_abbrev"); 564 DwarfInfoSection = Ctx->getCOFFSection( 565 ".debug_info", 566 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 567 COFF::IMAGE_SCN_MEM_READ, 568 SectionKind::getMetadata(), "section_info"); 569 DwarfLineSection = Ctx->getCOFFSection( 570 ".debug_line", 571 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 572 COFF::IMAGE_SCN_MEM_READ, 573 SectionKind::getMetadata(), "section_line"); 574 DwarfLineStrSection = Ctx->getCOFFSection( 575 ".debug_line_str", 576 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 577 COFF::IMAGE_SCN_MEM_READ, 578 SectionKind::getMetadata(), "section_line_str"); 579 DwarfFrameSection = Ctx->getCOFFSection( 580 ".debug_frame", 581 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 582 COFF::IMAGE_SCN_MEM_READ, 583 SectionKind::getMetadata()); 584 DwarfPubNamesSection = Ctx->getCOFFSection( 585 ".debug_pubnames", 586 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 587 COFF::IMAGE_SCN_MEM_READ, 588 SectionKind::getMetadata()); 589 DwarfPubTypesSection = Ctx->getCOFFSection( 590 ".debug_pubtypes", 591 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 592 COFF::IMAGE_SCN_MEM_READ, 593 SectionKind::getMetadata()); 594 DwarfGnuPubNamesSection = Ctx->getCOFFSection( 595 ".debug_gnu_pubnames", 596 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 597 COFF::IMAGE_SCN_MEM_READ, 598 SectionKind::getMetadata()); 599 DwarfGnuPubTypesSection = Ctx->getCOFFSection( 600 ".debug_gnu_pubtypes", 601 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 602 COFF::IMAGE_SCN_MEM_READ, 603 SectionKind::getMetadata()); 604 DwarfStrSection = Ctx->getCOFFSection( 605 ".debug_str", 606 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 607 COFF::IMAGE_SCN_MEM_READ, 608 SectionKind::getMetadata(), "info_string"); 609 DwarfStrOffSection = Ctx->getCOFFSection( 610 ".debug_str_offsets", 611 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 612 COFF::IMAGE_SCN_MEM_READ, 613 SectionKind::getMetadata(), "section_str_off"); 614 DwarfLocSection = Ctx->getCOFFSection( 615 ".debug_loc", 616 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 617 COFF::IMAGE_SCN_MEM_READ, 618 SectionKind::getMetadata(), "section_debug_loc"); 619 DwarfLoclistsSection = Ctx->getCOFFSection( 620 ".debug_loclists", 621 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 622 COFF::IMAGE_SCN_MEM_READ, 623 SectionKind::getMetadata(), "section_debug_loclists"); 624 DwarfARangesSection = Ctx->getCOFFSection( 625 ".debug_aranges", 626 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 627 COFF::IMAGE_SCN_MEM_READ, 628 SectionKind::getMetadata()); 629 DwarfRangesSection = Ctx->getCOFFSection( 630 ".debug_ranges", 631 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 632 COFF::IMAGE_SCN_MEM_READ, 633 SectionKind::getMetadata(), "debug_range"); 634 DwarfRnglistsSection = Ctx->getCOFFSection( 635 ".debug_rnglists", 636 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 637 COFF::IMAGE_SCN_MEM_READ, 638 SectionKind::getMetadata(), "debug_rnglists"); 639 DwarfMacinfoSection = Ctx->getCOFFSection( 640 ".debug_macinfo", 641 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 642 COFF::IMAGE_SCN_MEM_READ, 643 SectionKind::getMetadata(), "debug_macinfo"); 644 DwarfMacroSection = Ctx->getCOFFSection( 645 ".debug_macro", 646 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 647 COFF::IMAGE_SCN_MEM_READ, 648 SectionKind::getMetadata(), "debug_macro"); 649 DwarfMacinfoDWOSection = Ctx->getCOFFSection( 650 ".debug_macinfo.dwo", 651 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 652 COFF::IMAGE_SCN_MEM_READ, 653 SectionKind::getMetadata(), "debug_macinfo.dwo"); 654 DwarfMacroDWOSection = Ctx->getCOFFSection( 655 ".debug_macro.dwo", 656 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 657 COFF::IMAGE_SCN_MEM_READ, 658 SectionKind::getMetadata(), "debug_macro.dwo"); 659 DwarfInfoDWOSection = Ctx->getCOFFSection( 660 ".debug_info.dwo", 661 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 662 COFF::IMAGE_SCN_MEM_READ, 663 SectionKind::getMetadata(), "section_info_dwo"); 664 DwarfTypesDWOSection = Ctx->getCOFFSection( 665 ".debug_types.dwo", 666 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 667 COFF::IMAGE_SCN_MEM_READ, 668 SectionKind::getMetadata(), "section_types_dwo"); 669 DwarfAbbrevDWOSection = Ctx->getCOFFSection( 670 ".debug_abbrev.dwo", 671 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 672 COFF::IMAGE_SCN_MEM_READ, 673 SectionKind::getMetadata(), "section_abbrev_dwo"); 674 DwarfStrDWOSection = Ctx->getCOFFSection( 675 ".debug_str.dwo", 676 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 677 COFF::IMAGE_SCN_MEM_READ, 678 SectionKind::getMetadata(), "skel_string"); 679 DwarfLineDWOSection = Ctx->getCOFFSection( 680 ".debug_line.dwo", 681 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 682 COFF::IMAGE_SCN_MEM_READ, 683 SectionKind::getMetadata()); 684 DwarfLocDWOSection = Ctx->getCOFFSection( 685 ".debug_loc.dwo", 686 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 687 COFF::IMAGE_SCN_MEM_READ, 688 SectionKind::getMetadata(), "skel_loc"); 689 DwarfStrOffDWOSection = Ctx->getCOFFSection( 690 ".debug_str_offsets.dwo", 691 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 692 COFF::IMAGE_SCN_MEM_READ, 693 SectionKind::getMetadata(), "section_str_off_dwo"); 694 DwarfAddrSection = Ctx->getCOFFSection( 695 ".debug_addr", 696 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 697 COFF::IMAGE_SCN_MEM_READ, 698 SectionKind::getMetadata(), "addr_sec"); 699 DwarfCUIndexSection = Ctx->getCOFFSection( 700 ".debug_cu_index", 701 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 702 COFF::IMAGE_SCN_MEM_READ, 703 SectionKind::getMetadata()); 704 DwarfTUIndexSection = Ctx->getCOFFSection( 705 ".debug_tu_index", 706 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 707 COFF::IMAGE_SCN_MEM_READ, 708 SectionKind::getMetadata()); 709 DwarfDebugNamesSection = Ctx->getCOFFSection( 710 ".debug_names", 711 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 712 COFF::IMAGE_SCN_MEM_READ, 713 SectionKind::getMetadata(), "debug_names_begin"); 714 DwarfAccelNamesSection = Ctx->getCOFFSection( 715 ".apple_names", 716 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 717 COFF::IMAGE_SCN_MEM_READ, 718 SectionKind::getMetadata(), "names_begin"); 719 DwarfAccelNamespaceSection = Ctx->getCOFFSection( 720 ".apple_namespaces", 721 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 722 COFF::IMAGE_SCN_MEM_READ, 723 SectionKind::getMetadata(), "namespac_begin"); 724 DwarfAccelTypesSection = Ctx->getCOFFSection( 725 ".apple_types", 726 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 727 COFF::IMAGE_SCN_MEM_READ, 728 SectionKind::getMetadata(), "types_begin"); 729 DwarfAccelObjCSection = Ctx->getCOFFSection( 730 ".apple_objc", 731 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 732 COFF::IMAGE_SCN_MEM_READ, 733 SectionKind::getMetadata(), "objc_begin"); 734 735 DrectveSection = Ctx->getCOFFSection( 736 ".drectve", COFF::IMAGE_SCN_LNK_INFO | COFF::IMAGE_SCN_LNK_REMOVE, 737 SectionKind::getMetadata()); 738 739 PDataSection = Ctx->getCOFFSection( 740 ".pdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, 741 SectionKind::getData()); 742 743 XDataSection = Ctx->getCOFFSection( 744 ".xdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, 745 SectionKind::getData()); 746 747 SXDataSection = Ctx->getCOFFSection(".sxdata", COFF::IMAGE_SCN_LNK_INFO, 748 SectionKind::getMetadata()); 749 750 GFIDsSection = Ctx->getCOFFSection(".gfids$y", 751 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 752 COFF::IMAGE_SCN_MEM_READ, 753 SectionKind::getMetadata()); 754 755 GLJMPSection = Ctx->getCOFFSection(".gljmp$y", 756 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 757 COFF::IMAGE_SCN_MEM_READ, 758 SectionKind::getMetadata()); 759 760 TLSDataSection = Ctx->getCOFFSection( 761 ".tls$", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ | 762 COFF::IMAGE_SCN_MEM_WRITE, 763 SectionKind::getData()); 764 765 StackMapSection = Ctx->getCOFFSection(".llvm_stackmaps", 766 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 767 COFF::IMAGE_SCN_MEM_READ, 768 SectionKind::getReadOnly()); 769 } 770 771 void MCObjectFileInfo::initWasmMCObjectFileInfo(const Triple &T) { 772 TextSection = Ctx->getWasmSection(".text", SectionKind::getText()); 773 DataSection = Ctx->getWasmSection(".data", SectionKind::getData()); 774 775 DwarfLineSection = 776 Ctx->getWasmSection(".debug_line", SectionKind::getMetadata()); 777 DwarfLineStrSection = 778 Ctx->getWasmSection(".debug_line_str", SectionKind::getMetadata()); 779 DwarfStrSection = 780 Ctx->getWasmSection(".debug_str", SectionKind::getMetadata()); 781 DwarfLocSection = 782 Ctx->getWasmSection(".debug_loc", SectionKind::getMetadata()); 783 DwarfAbbrevSection = 784 Ctx->getWasmSection(".debug_abbrev", SectionKind::getMetadata()); 785 DwarfARangesSection = Ctx->getWasmSection(".debug_aranges", SectionKind::getMetadata()); 786 DwarfRangesSection = 787 Ctx->getWasmSection(".debug_ranges", SectionKind::getMetadata()); 788 DwarfMacinfoSection = 789 Ctx->getWasmSection(".debug_macinfo", SectionKind::getMetadata()); 790 DwarfMacroSection = 791 Ctx->getWasmSection(".debug_macro", SectionKind::getMetadata()); 792 DwarfCUIndexSection = Ctx->getWasmSection(".debug_cu_index", SectionKind::getMetadata()); 793 DwarfTUIndexSection = Ctx->getWasmSection(".debug_tu_index", SectionKind::getMetadata()); 794 DwarfInfoSection = 795 Ctx->getWasmSection(".debug_info", SectionKind::getMetadata()); 796 DwarfFrameSection = Ctx->getWasmSection(".debug_frame", SectionKind::getMetadata()); 797 DwarfPubNamesSection = Ctx->getWasmSection(".debug_pubnames", SectionKind::getMetadata()); 798 DwarfPubTypesSection = Ctx->getWasmSection(".debug_pubtypes", SectionKind::getMetadata()); 799 800 DwarfDebugNamesSection = 801 Ctx->getWasmSection(".debug_names", SectionKind::getMetadata()); 802 DwarfStrOffSection = 803 Ctx->getWasmSection(".debug_str_offsets", SectionKind::getMetadata()); 804 DwarfAddrSection = 805 Ctx->getWasmSection(".debug_addr", SectionKind::getMetadata()); 806 DwarfRnglistsSection = 807 Ctx->getWasmSection(".debug_rnglists", SectionKind::getMetadata()); 808 DwarfLoclistsSection = 809 Ctx->getWasmSection(".debug_loclists", SectionKind::getMetadata()); 810 811 // Wasm use data section for LSDA. 812 // TODO Consider putting each function's exception table in a separate 813 // section, as in -function-sections, to facilitate lld's --gc-section. 814 LSDASection = Ctx->getWasmSection(".rodata.gcc_except_table", 815 SectionKind::getReadOnlyWithRel()); 816 817 // TODO: Define more sections. 818 } 819 820 void MCObjectFileInfo::initXCOFFMCObjectFileInfo(const Triple &T) { 821 // The default csect for program code. Functions without a specified section 822 // get placed into this csect. The choice of csect name is not a property of 823 // the ABI or object file format. For example, the XL compiler uses an unnamed 824 // csect for program code. 825 TextSection = Ctx->getXCOFFSection( 826 ".text", XCOFF::StorageMappingClass::XMC_PR, XCOFF::XTY_SD, 827 XCOFF::C_HIDEXT, SectionKind::getText()); 828 829 DataSection = Ctx->getXCOFFSection( 830 ".data", XCOFF::StorageMappingClass::XMC_RW, XCOFF::XTY_SD, 831 XCOFF::C_HIDEXT, SectionKind::getData()); 832 833 ReadOnlySection = Ctx->getXCOFFSection( 834 ".rodata", XCOFF::StorageMappingClass::XMC_RO, XCOFF::XTY_SD, 835 XCOFF::C_HIDEXT, SectionKind::getReadOnly()); 836 837 TOCBaseSection = Ctx->getXCOFFSection( 838 "TOC", XCOFF::StorageMappingClass::XMC_TC0, XCOFF::XTY_SD, 839 XCOFF::C_HIDEXT, SectionKind::getData()); 840 841 // The TOC-base always has 0 size, but 4 byte alignment. 842 TOCBaseSection->setAlignment(Align(4)); 843 844 // DWARF sections for XCOFF are not csects. They are special STYP_DWARF 845 // sections, and the individual DWARF sections are distinguished by their 846 // section subtype. 847 // TODO: Populate the DWARF sections appropriately. 848 DwarfAbbrevSection = nullptr; // SSUBTYP_DWABREV 849 DwarfInfoSection = nullptr; // SSUBTYP_DWINFO 850 DwarfLineSection = nullptr; // SSUBTYP_DWLINE 851 DwarfFrameSection = nullptr; // SSUBTYP_DWFRAME 852 DwarfPubNamesSection = nullptr; // SSUBTYP_DWPBNMS 853 DwarfPubTypesSection = nullptr; // SSUBTYP_DWPBTYP 854 DwarfStrSection = nullptr; // SSUBTYP_DWSTR 855 DwarfLocSection = nullptr; // SSUBTYP_DWLOC 856 DwarfARangesSection = nullptr; // SSUBTYP_DWARNGE 857 DwarfRangesSection = nullptr; // SSUBTYP_DWRNGES 858 DwarfMacinfoSection = nullptr; // SSUBTYP_DWMAC 859 } 860 861 void MCObjectFileInfo::InitMCObjectFileInfo(const Triple &TheTriple, bool PIC, 862 MCContext &ctx, 863 bool LargeCodeModel) { 864 PositionIndependent = PIC; 865 Ctx = &ctx; 866 867 // Common. 868 CommDirectiveSupportsAlignment = true; 869 SupportsWeakOmittedEHFrame = true; 870 SupportsCompactUnwindWithoutEHFrame = false; 871 OmitDwarfIfHaveCompactUnwind = false; 872 873 FDECFIEncoding = dwarf::DW_EH_PE_absptr; 874 875 CompactUnwindDwarfEHFrameOnly = 0; 876 877 EHFrameSection = nullptr; // Created on demand. 878 CompactUnwindSection = nullptr; // Used only by selected targets. 879 DwarfAccelNamesSection = nullptr; // Used only by selected targets. 880 DwarfAccelObjCSection = nullptr; // Used only by selected targets. 881 DwarfAccelNamespaceSection = nullptr; // Used only by selected targets. 882 DwarfAccelTypesSection = nullptr; // Used only by selected targets. 883 884 TT = TheTriple; 885 886 switch (TT.getObjectFormat()) { 887 case Triple::MachO: 888 Env = IsMachO; 889 initMachOMCObjectFileInfo(TT); 890 break; 891 case Triple::COFF: 892 if (!TT.isOSWindows()) 893 report_fatal_error( 894 "Cannot initialize MC for non-Windows COFF object files."); 895 896 Env = IsCOFF; 897 initCOFFMCObjectFileInfo(TT); 898 break; 899 case Triple::ELF: 900 Env = IsELF; 901 initELFMCObjectFileInfo(TT, LargeCodeModel); 902 break; 903 case Triple::Wasm: 904 Env = IsWasm; 905 initWasmMCObjectFileInfo(TT); 906 break; 907 case Triple::XCOFF: 908 Env = IsXCOFF; 909 initXCOFFMCObjectFileInfo(TT); 910 break; 911 case Triple::UnknownObjectFormat: 912 report_fatal_error("Cannot initialize MC for unknown object file format."); 913 break; 914 } 915 } 916 917 MCSection *MCObjectFileInfo::getDwarfComdatSection(const char *Name, 918 uint64_t Hash) const { 919 switch (TT.getObjectFormat()) { 920 case Triple::ELF: 921 return Ctx->getELFSection(Name, ELF::SHT_PROGBITS, ELF::SHF_GROUP, 0, 922 utostr(Hash)); 923 case Triple::MachO: 924 case Triple::COFF: 925 case Triple::Wasm: 926 case Triple::XCOFF: 927 case Triple::UnknownObjectFormat: 928 report_fatal_error("Cannot get DWARF comdat section for this object file " 929 "format: not implemented."); 930 break; 931 } 932 llvm_unreachable("Unknown ObjectFormatType"); 933 } 934 935 MCSection * 936 MCObjectFileInfo::getStackSizesSection(const MCSection &TextSec) const { 937 if (Env != IsELF) 938 return StackSizesSection; 939 940 const MCSectionELF &ElfSec = static_cast<const MCSectionELF &>(TextSec); 941 unsigned Flags = ELF::SHF_LINK_ORDER; 942 StringRef GroupName; 943 if (const MCSymbol *Group = ElfSec.getGroup()) { 944 GroupName = Group->getName(); 945 Flags |= ELF::SHF_GROUP; 946 } 947 948 return Ctx->getELFSection(".stack_sizes", ELF::SHT_PROGBITS, Flags, 0, 949 GroupName, MCSection::NonUniqueID, 950 cast<MCSymbolELF>(TextSec.getBeginSymbol())); 951 } 952