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 DwarfDebugInlineSection = 280 Ctx->getMachOSection("__DWARF", "__debug_inlined", MachO::S_ATTR_DEBUG, 281 SectionKind::getMetadata()); 282 DwarfCUIndexSection = 283 Ctx->getMachOSection("__DWARF", "__debug_cu_index", MachO::S_ATTR_DEBUG, 284 SectionKind::getMetadata()); 285 DwarfTUIndexSection = 286 Ctx->getMachOSection("__DWARF", "__debug_tu_index", MachO::S_ATTR_DEBUG, 287 SectionKind::getMetadata()); 288 StackMapSection = Ctx->getMachOSection("__LLVM_STACKMAPS", "__llvm_stackmaps", 289 0, SectionKind::getMetadata()); 290 291 FaultMapSection = Ctx->getMachOSection("__LLVM_FAULTMAPS", "__llvm_faultmaps", 292 0, SectionKind::getMetadata()); 293 294 RemarksSection = Ctx->getMachOSection( 295 "__LLVM", "__remarks", MachO::S_ATTR_DEBUG, SectionKind::getMetadata()); 296 297 TLSExtraDataSection = TLSTLVSection; 298 } 299 300 void MCObjectFileInfo::initELFMCObjectFileInfo(const Triple &T, bool Large) { 301 switch (T.getArch()) { 302 case Triple::mips: 303 case Triple::mipsel: 304 case Triple::mips64: 305 case Triple::mips64el: 306 // We cannot use DW_EH_PE_sdata8 for the large PositionIndependent case 307 // since there is no R_MIPS_PC64 relocation (only a 32-bit version). 308 if (PositionIndependent && !Large) 309 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 310 else 311 FDECFIEncoding = Ctx->getAsmInfo()->getCodePointerSize() == 4 312 ? dwarf::DW_EH_PE_sdata4 313 : dwarf::DW_EH_PE_sdata8; 314 break; 315 case Triple::ppc64: 316 case Triple::ppc64le: 317 case Triple::x86_64: 318 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | 319 (Large ? dwarf::DW_EH_PE_sdata8 : dwarf::DW_EH_PE_sdata4); 320 break; 321 case Triple::bpfel: 322 case Triple::bpfeb: 323 FDECFIEncoding = dwarf::DW_EH_PE_sdata8; 324 break; 325 case Triple::hexagon: 326 FDECFIEncoding = 327 PositionIndependent ? dwarf::DW_EH_PE_pcrel : dwarf::DW_EH_PE_absptr; 328 break; 329 default: 330 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 331 break; 332 } 333 334 unsigned EHSectionType = T.getArch() == Triple::x86_64 335 ? ELF::SHT_X86_64_UNWIND 336 : ELF::SHT_PROGBITS; 337 338 // Solaris requires different flags for .eh_frame to seemingly every other 339 // platform. 340 unsigned EHSectionFlags = ELF::SHF_ALLOC; 341 if (T.isOSSolaris() && T.getArch() != Triple::x86_64) 342 EHSectionFlags |= ELF::SHF_WRITE; 343 344 // ELF 345 BSSSection = Ctx->getELFSection(".bss", ELF::SHT_NOBITS, 346 ELF::SHF_WRITE | ELF::SHF_ALLOC); 347 348 TextSection = Ctx->getELFSection(".text", ELF::SHT_PROGBITS, 349 ELF::SHF_EXECINSTR | ELF::SHF_ALLOC); 350 351 DataSection = Ctx->getELFSection(".data", ELF::SHT_PROGBITS, 352 ELF::SHF_WRITE | ELF::SHF_ALLOC); 353 354 ReadOnlySection = 355 Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); 356 357 TLSDataSection = 358 Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS, 359 ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE); 360 361 TLSBSSSection = Ctx->getELFSection( 362 ".tbss", ELF::SHT_NOBITS, ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE); 363 364 DataRelROSection = Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS, 365 ELF::SHF_ALLOC | ELF::SHF_WRITE); 366 367 MergeableConst4Section = 368 Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS, 369 ELF::SHF_ALLOC | ELF::SHF_MERGE, 4, ""); 370 371 MergeableConst8Section = 372 Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS, 373 ELF::SHF_ALLOC | ELF::SHF_MERGE, 8, ""); 374 375 MergeableConst16Section = 376 Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS, 377 ELF::SHF_ALLOC | ELF::SHF_MERGE, 16, ""); 378 379 MergeableConst32Section = 380 Ctx->getELFSection(".rodata.cst32", ELF::SHT_PROGBITS, 381 ELF::SHF_ALLOC | ELF::SHF_MERGE, 32, ""); 382 383 // Exception Handling Sections. 384 385 // FIXME: We're emitting LSDA info into a readonly section on ELF, even though 386 // it contains relocatable pointers. In PIC mode, this is probably a big 387 // runtime hit for C++ apps. Either the contents of the LSDA need to be 388 // adjusted or this should be a data section. 389 LSDASection = Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS, 390 ELF::SHF_ALLOC); 391 392 COFFDebugSymbolsSection = nullptr; 393 COFFDebugTypesSection = nullptr; 394 395 unsigned DebugSecType = ELF::SHT_PROGBITS; 396 397 // MIPS .debug_* sections should have SHT_MIPS_DWARF section type 398 // to distinguish among sections contain DWARF and ECOFF debug formats. 399 // Sections with ECOFF debug format are obsoleted and marked by SHT_PROGBITS. 400 if (T.isMIPS()) 401 DebugSecType = ELF::SHT_MIPS_DWARF; 402 403 // Debug Info Sections. 404 DwarfAbbrevSection = 405 Ctx->getELFSection(".debug_abbrev", DebugSecType, 0); 406 DwarfInfoSection = Ctx->getELFSection(".debug_info", DebugSecType, 0); 407 DwarfLineSection = Ctx->getELFSection(".debug_line", DebugSecType, 0); 408 DwarfLineStrSection = 409 Ctx->getELFSection(".debug_line_str", DebugSecType, 410 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, ""); 411 DwarfFrameSection = Ctx->getELFSection(".debug_frame", DebugSecType, 0); 412 DwarfPubNamesSection = 413 Ctx->getELFSection(".debug_pubnames", DebugSecType, 0); 414 DwarfPubTypesSection = 415 Ctx->getELFSection(".debug_pubtypes", DebugSecType, 0); 416 DwarfGnuPubNamesSection = 417 Ctx->getELFSection(".debug_gnu_pubnames", DebugSecType, 0); 418 DwarfGnuPubTypesSection = 419 Ctx->getELFSection(".debug_gnu_pubtypes", DebugSecType, 0); 420 DwarfStrSection = 421 Ctx->getELFSection(".debug_str", DebugSecType, 422 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, ""); 423 DwarfLocSection = Ctx->getELFSection(".debug_loc", DebugSecType, 0); 424 DwarfARangesSection = 425 Ctx->getELFSection(".debug_aranges", DebugSecType, 0); 426 DwarfRangesSection = 427 Ctx->getELFSection(".debug_ranges", DebugSecType, 0); 428 DwarfMacinfoSection = 429 Ctx->getELFSection(".debug_macinfo", DebugSecType, 0); 430 431 // DWARF5 Experimental Debug Info 432 433 // Accelerator Tables 434 DwarfDebugNamesSection = 435 Ctx->getELFSection(".debug_names", ELF::SHT_PROGBITS, 0); 436 DwarfAccelNamesSection = 437 Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0); 438 DwarfAccelObjCSection = 439 Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0); 440 DwarfAccelNamespaceSection = 441 Ctx->getELFSection(".apple_namespaces", ELF::SHT_PROGBITS, 0); 442 DwarfAccelTypesSection = 443 Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0); 444 445 // String Offset and Address Sections 446 DwarfStrOffSection = 447 Ctx->getELFSection(".debug_str_offsets", DebugSecType, 0); 448 DwarfAddrSection = Ctx->getELFSection(".debug_addr", DebugSecType, 0); 449 DwarfRnglistsSection = Ctx->getELFSection(".debug_rnglists", DebugSecType, 0); 450 DwarfLoclistsSection = Ctx->getELFSection(".debug_loclists", DebugSecType, 0); 451 452 // Fission Sections 453 DwarfInfoDWOSection = 454 Ctx->getELFSection(".debug_info.dwo", DebugSecType, ELF::SHF_EXCLUDE); 455 DwarfTypesDWOSection = 456 Ctx->getELFSection(".debug_types.dwo", DebugSecType, ELF::SHF_EXCLUDE); 457 DwarfAbbrevDWOSection = 458 Ctx->getELFSection(".debug_abbrev.dwo", DebugSecType, ELF::SHF_EXCLUDE); 459 DwarfStrDWOSection = Ctx->getELFSection( 460 ".debug_str.dwo", DebugSecType, 461 ELF::SHF_MERGE | ELF::SHF_STRINGS | ELF::SHF_EXCLUDE, 1, ""); 462 DwarfLineDWOSection = 463 Ctx->getELFSection(".debug_line.dwo", DebugSecType, ELF::SHF_EXCLUDE); 464 DwarfLocDWOSection = 465 Ctx->getELFSection(".debug_loc.dwo", DebugSecType, ELF::SHF_EXCLUDE); 466 DwarfStrOffDWOSection = Ctx->getELFSection(".debug_str_offsets.dwo", 467 DebugSecType, ELF::SHF_EXCLUDE); 468 DwarfRnglistsDWOSection = 469 Ctx->getELFSection(".debug_rnglists.dwo", DebugSecType, ELF::SHF_EXCLUDE); 470 DwarfMacinfoDWOSection = 471 Ctx->getELFSection(".debug_macinfo.dwo", DebugSecType, ELF::SHF_EXCLUDE); 472 473 DwarfLoclistsDWOSection = 474 Ctx->getELFSection(".debug_loclists.dwo", DebugSecType, ELF::SHF_EXCLUDE); 475 476 // DWP Sections 477 DwarfCUIndexSection = 478 Ctx->getELFSection(".debug_cu_index", DebugSecType, 0); 479 DwarfTUIndexSection = 480 Ctx->getELFSection(".debug_tu_index", DebugSecType, 0); 481 482 StackMapSection = 483 Ctx->getELFSection(".llvm_stackmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); 484 485 FaultMapSection = 486 Ctx->getELFSection(".llvm_faultmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); 487 488 EHFrameSection = 489 Ctx->getELFSection(".eh_frame", EHSectionType, EHSectionFlags); 490 491 StackSizesSection = Ctx->getELFSection(".stack_sizes", ELF::SHT_PROGBITS, 0); 492 } 493 494 void MCObjectFileInfo::initCOFFMCObjectFileInfo(const Triple &T) { 495 EHFrameSection = 496 Ctx->getCOFFSection(".eh_frame", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 497 COFF::IMAGE_SCN_MEM_READ, 498 SectionKind::getData()); 499 500 // Set the `IMAGE_SCN_MEM_16BIT` flag when compiling for thumb mode. This is 501 // used to indicate to the linker that the text segment contains thumb instructions 502 // and to set the ISA selection bit for calls accordingly. 503 const bool IsThumb = T.getArch() == Triple::thumb; 504 505 CommDirectiveSupportsAlignment = true; 506 507 // COFF 508 BSSSection = Ctx->getCOFFSection( 509 ".bss", COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA | 510 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE, 511 SectionKind::getBSS()); 512 TextSection = Ctx->getCOFFSection( 513 ".text", 514 (IsThumb ? COFF::IMAGE_SCN_MEM_16BIT : (COFF::SectionCharacteristics)0) | 515 COFF::IMAGE_SCN_CNT_CODE | COFF::IMAGE_SCN_MEM_EXECUTE | 516 COFF::IMAGE_SCN_MEM_READ, 517 SectionKind::getText()); 518 DataSection = Ctx->getCOFFSection( 519 ".data", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ | 520 COFF::IMAGE_SCN_MEM_WRITE, 521 SectionKind::getData()); 522 ReadOnlySection = Ctx->getCOFFSection( 523 ".rdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, 524 SectionKind::getReadOnly()); 525 526 if (T.getArch() == Triple::x86_64 || T.getArch() == Triple::aarch64) { 527 // On Windows 64 with SEH, the LSDA is emitted into the .xdata section 528 LSDASection = nullptr; 529 } else { 530 LSDASection = Ctx->getCOFFSection(".gcc_except_table", 531 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 532 COFF::IMAGE_SCN_MEM_READ, 533 SectionKind::getReadOnly()); 534 } 535 536 // Debug info. 537 COFFDebugSymbolsSection = 538 Ctx->getCOFFSection(".debug$S", (COFF::IMAGE_SCN_MEM_DISCARDABLE | 539 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 540 COFF::IMAGE_SCN_MEM_READ), 541 SectionKind::getMetadata()); 542 COFFDebugTypesSection = 543 Ctx->getCOFFSection(".debug$T", (COFF::IMAGE_SCN_MEM_DISCARDABLE | 544 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 545 COFF::IMAGE_SCN_MEM_READ), 546 SectionKind::getMetadata()); 547 COFFGlobalTypeHashesSection = Ctx->getCOFFSection( 548 ".debug$H", 549 (COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 550 COFF::IMAGE_SCN_MEM_READ), 551 SectionKind::getMetadata()); 552 553 DwarfAbbrevSection = Ctx->getCOFFSection( 554 ".debug_abbrev", 555 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 556 COFF::IMAGE_SCN_MEM_READ, 557 SectionKind::getMetadata(), "section_abbrev"); 558 DwarfInfoSection = Ctx->getCOFFSection( 559 ".debug_info", 560 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 561 COFF::IMAGE_SCN_MEM_READ, 562 SectionKind::getMetadata(), "section_info"); 563 DwarfLineSection = Ctx->getCOFFSection( 564 ".debug_line", 565 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 566 COFF::IMAGE_SCN_MEM_READ, 567 SectionKind::getMetadata(), "section_line"); 568 DwarfLineStrSection = Ctx->getCOFFSection( 569 ".debug_line_str", 570 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 571 COFF::IMAGE_SCN_MEM_READ, 572 SectionKind::getMetadata(), "section_line_str"); 573 DwarfFrameSection = Ctx->getCOFFSection( 574 ".debug_frame", 575 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 576 COFF::IMAGE_SCN_MEM_READ, 577 SectionKind::getMetadata()); 578 DwarfPubNamesSection = Ctx->getCOFFSection( 579 ".debug_pubnames", 580 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 581 COFF::IMAGE_SCN_MEM_READ, 582 SectionKind::getMetadata()); 583 DwarfPubTypesSection = Ctx->getCOFFSection( 584 ".debug_pubtypes", 585 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 586 COFF::IMAGE_SCN_MEM_READ, 587 SectionKind::getMetadata()); 588 DwarfGnuPubNamesSection = Ctx->getCOFFSection( 589 ".debug_gnu_pubnames", 590 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 591 COFF::IMAGE_SCN_MEM_READ, 592 SectionKind::getMetadata()); 593 DwarfGnuPubTypesSection = Ctx->getCOFFSection( 594 ".debug_gnu_pubtypes", 595 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 596 COFF::IMAGE_SCN_MEM_READ, 597 SectionKind::getMetadata()); 598 DwarfStrSection = Ctx->getCOFFSection( 599 ".debug_str", 600 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 601 COFF::IMAGE_SCN_MEM_READ, 602 SectionKind::getMetadata(), "info_string"); 603 DwarfStrOffSection = Ctx->getCOFFSection( 604 ".debug_str_offsets", 605 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 606 COFF::IMAGE_SCN_MEM_READ, 607 SectionKind::getMetadata(), "section_str_off"); 608 DwarfLocSection = Ctx->getCOFFSection( 609 ".debug_loc", 610 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 611 COFF::IMAGE_SCN_MEM_READ, 612 SectionKind::getMetadata(), "section_debug_loc"); 613 DwarfARangesSection = Ctx->getCOFFSection( 614 ".debug_aranges", 615 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 616 COFF::IMAGE_SCN_MEM_READ, 617 SectionKind::getMetadata()); 618 DwarfRangesSection = Ctx->getCOFFSection( 619 ".debug_ranges", 620 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 621 COFF::IMAGE_SCN_MEM_READ, 622 SectionKind::getMetadata(), "debug_range"); 623 DwarfMacinfoSection = Ctx->getCOFFSection( 624 ".debug_macinfo", 625 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 626 COFF::IMAGE_SCN_MEM_READ, 627 SectionKind::getMetadata(), "debug_macinfo"); 628 DwarfMacinfoDWOSection = Ctx->getCOFFSection( 629 ".debug_macinfo.dwo", 630 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 631 COFF::IMAGE_SCN_MEM_READ, 632 SectionKind::getMetadata(), "debug_macinfo.dwo"); 633 DwarfInfoDWOSection = Ctx->getCOFFSection( 634 ".debug_info.dwo", 635 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 636 COFF::IMAGE_SCN_MEM_READ, 637 SectionKind::getMetadata(), "section_info_dwo"); 638 DwarfTypesDWOSection = Ctx->getCOFFSection( 639 ".debug_types.dwo", 640 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 641 COFF::IMAGE_SCN_MEM_READ, 642 SectionKind::getMetadata(), "section_types_dwo"); 643 DwarfAbbrevDWOSection = Ctx->getCOFFSection( 644 ".debug_abbrev.dwo", 645 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 646 COFF::IMAGE_SCN_MEM_READ, 647 SectionKind::getMetadata(), "section_abbrev_dwo"); 648 DwarfStrDWOSection = Ctx->getCOFFSection( 649 ".debug_str.dwo", 650 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 651 COFF::IMAGE_SCN_MEM_READ, 652 SectionKind::getMetadata(), "skel_string"); 653 DwarfLineDWOSection = Ctx->getCOFFSection( 654 ".debug_line.dwo", 655 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 656 COFF::IMAGE_SCN_MEM_READ, 657 SectionKind::getMetadata()); 658 DwarfLocDWOSection = Ctx->getCOFFSection( 659 ".debug_loc.dwo", 660 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 661 COFF::IMAGE_SCN_MEM_READ, 662 SectionKind::getMetadata(), "skel_loc"); 663 DwarfStrOffDWOSection = Ctx->getCOFFSection( 664 ".debug_str_offsets.dwo", 665 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 666 COFF::IMAGE_SCN_MEM_READ, 667 SectionKind::getMetadata(), "section_str_off_dwo"); 668 DwarfAddrSection = Ctx->getCOFFSection( 669 ".debug_addr", 670 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 671 COFF::IMAGE_SCN_MEM_READ, 672 SectionKind::getMetadata(), "addr_sec"); 673 DwarfCUIndexSection = Ctx->getCOFFSection( 674 ".debug_cu_index", 675 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 676 COFF::IMAGE_SCN_MEM_READ, 677 SectionKind::getMetadata()); 678 DwarfTUIndexSection = Ctx->getCOFFSection( 679 ".debug_tu_index", 680 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 681 COFF::IMAGE_SCN_MEM_READ, 682 SectionKind::getMetadata()); 683 DwarfDebugNamesSection = Ctx->getCOFFSection( 684 ".debug_names", 685 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 686 COFF::IMAGE_SCN_MEM_READ, 687 SectionKind::getMetadata(), "debug_names_begin"); 688 DwarfAccelNamesSection = Ctx->getCOFFSection( 689 ".apple_names", 690 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 691 COFF::IMAGE_SCN_MEM_READ, 692 SectionKind::getMetadata(), "names_begin"); 693 DwarfAccelNamespaceSection = Ctx->getCOFFSection( 694 ".apple_namespaces", 695 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 696 COFF::IMAGE_SCN_MEM_READ, 697 SectionKind::getMetadata(), "namespac_begin"); 698 DwarfAccelTypesSection = Ctx->getCOFFSection( 699 ".apple_types", 700 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 701 COFF::IMAGE_SCN_MEM_READ, 702 SectionKind::getMetadata(), "types_begin"); 703 DwarfAccelObjCSection = Ctx->getCOFFSection( 704 ".apple_objc", 705 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 706 COFF::IMAGE_SCN_MEM_READ, 707 SectionKind::getMetadata(), "objc_begin"); 708 709 DrectveSection = Ctx->getCOFFSection( 710 ".drectve", COFF::IMAGE_SCN_LNK_INFO | COFF::IMAGE_SCN_LNK_REMOVE, 711 SectionKind::getMetadata()); 712 713 PDataSection = Ctx->getCOFFSection( 714 ".pdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, 715 SectionKind::getData()); 716 717 XDataSection = Ctx->getCOFFSection( 718 ".xdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, 719 SectionKind::getData()); 720 721 SXDataSection = Ctx->getCOFFSection(".sxdata", COFF::IMAGE_SCN_LNK_INFO, 722 SectionKind::getMetadata()); 723 724 GFIDsSection = Ctx->getCOFFSection(".gfids$y", 725 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 726 COFF::IMAGE_SCN_MEM_READ, 727 SectionKind::getMetadata()); 728 729 GLJMPSection = Ctx->getCOFFSection(".gljmp$y", 730 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 731 COFF::IMAGE_SCN_MEM_READ, 732 SectionKind::getMetadata()); 733 734 TLSDataSection = Ctx->getCOFFSection( 735 ".tls$", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ | 736 COFF::IMAGE_SCN_MEM_WRITE, 737 SectionKind::getData()); 738 739 StackMapSection = Ctx->getCOFFSection(".llvm_stackmaps", 740 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 741 COFF::IMAGE_SCN_MEM_READ, 742 SectionKind::getReadOnly()); 743 } 744 745 void MCObjectFileInfo::initWasmMCObjectFileInfo(const Triple &T) { 746 TextSection = Ctx->getWasmSection(".text", SectionKind::getText()); 747 DataSection = Ctx->getWasmSection(".data", SectionKind::getData()); 748 749 DwarfLineSection = 750 Ctx->getWasmSection(".debug_line", SectionKind::getMetadata()); 751 DwarfLineStrSection = 752 Ctx->getWasmSection(".debug_line_str", SectionKind::getMetadata()); 753 DwarfStrSection = 754 Ctx->getWasmSection(".debug_str", SectionKind::getMetadata()); 755 DwarfLocSection = 756 Ctx->getWasmSection(".debug_loc", SectionKind::getMetadata()); 757 DwarfAbbrevSection = 758 Ctx->getWasmSection(".debug_abbrev", SectionKind::getMetadata()); 759 DwarfARangesSection = Ctx->getWasmSection(".debug_aranges", SectionKind::getMetadata()); 760 DwarfRangesSection = 761 Ctx->getWasmSection(".debug_ranges", SectionKind::getMetadata()); 762 DwarfMacinfoSection = 763 Ctx->getWasmSection(".debug_macinfo", SectionKind::getMetadata()); 764 DwarfCUIndexSection = Ctx->getWasmSection(".debug_cu_index", SectionKind::getMetadata()); 765 DwarfTUIndexSection = Ctx->getWasmSection(".debug_tu_index", SectionKind::getMetadata()); 766 DwarfInfoSection = 767 Ctx->getWasmSection(".debug_info", SectionKind::getMetadata()); 768 DwarfFrameSection = Ctx->getWasmSection(".debug_frame", SectionKind::getMetadata()); 769 DwarfPubNamesSection = Ctx->getWasmSection(".debug_pubnames", SectionKind::getMetadata()); 770 DwarfPubTypesSection = Ctx->getWasmSection(".debug_pubtypes", SectionKind::getMetadata()); 771 772 DwarfDebugNamesSection = 773 Ctx->getWasmSection(".debug_names", SectionKind::getMetadata()); 774 DwarfStrOffSection = 775 Ctx->getWasmSection(".debug_str_offsets", SectionKind::getMetadata()); 776 DwarfAddrSection = 777 Ctx->getWasmSection(".debug_addr", SectionKind::getMetadata()); 778 DwarfRnglistsSection = 779 Ctx->getWasmSection(".debug_rnglists", SectionKind::getMetadata()); 780 DwarfLoclistsSection = 781 Ctx->getWasmSection(".debug_loclists", SectionKind::getMetadata()); 782 783 // Wasm use data section for LSDA. 784 // TODO Consider putting each function's exception table in a separate 785 // section, as in -function-sections, to facilitate lld's --gc-section. 786 LSDASection = Ctx->getWasmSection(".rodata.gcc_except_table", 787 SectionKind::getReadOnlyWithRel()); 788 789 // TODO: Define more sections. 790 } 791 792 void MCObjectFileInfo::initXCOFFMCObjectFileInfo(const Triple &T) { 793 // The default csect for program code. Functions without a specified section 794 // get placed into this csect. The choice of csect name is not a property of 795 // the ABI or object file format. For example, the XL compiler uses an unnamed 796 // csect for program code. 797 TextSection = Ctx->getXCOFFSection( 798 ".text", XCOFF::StorageMappingClass::XMC_PR, XCOFF::XTY_SD, 799 XCOFF::C_HIDEXT, SectionKind::getText()); 800 801 DataSection = Ctx->getXCOFFSection( 802 ".data", XCOFF::StorageMappingClass::XMC_RW, XCOFF::XTY_SD, 803 XCOFF::C_HIDEXT, SectionKind::getData()); 804 805 ReadOnlySection = Ctx->getXCOFFSection( 806 ".rodata", XCOFF::StorageMappingClass::XMC_RO, XCOFF::XTY_SD, 807 XCOFF::C_HIDEXT, SectionKind::getReadOnly()); 808 } 809 810 void MCObjectFileInfo::InitMCObjectFileInfo(const Triple &TheTriple, bool PIC, 811 MCContext &ctx, 812 bool LargeCodeModel) { 813 PositionIndependent = PIC; 814 Ctx = &ctx; 815 816 // Common. 817 CommDirectiveSupportsAlignment = true; 818 SupportsWeakOmittedEHFrame = true; 819 SupportsCompactUnwindWithoutEHFrame = false; 820 OmitDwarfIfHaveCompactUnwind = false; 821 822 FDECFIEncoding = dwarf::DW_EH_PE_absptr; 823 824 CompactUnwindDwarfEHFrameOnly = 0; 825 826 EHFrameSection = nullptr; // Created on demand. 827 CompactUnwindSection = nullptr; // Used only by selected targets. 828 DwarfAccelNamesSection = nullptr; // Used only by selected targets. 829 DwarfAccelObjCSection = nullptr; // Used only by selected targets. 830 DwarfAccelNamespaceSection = nullptr; // Used only by selected targets. 831 DwarfAccelTypesSection = nullptr; // Used only by selected targets. 832 833 TT = TheTriple; 834 835 switch (TT.getObjectFormat()) { 836 case Triple::MachO: 837 Env = IsMachO; 838 initMachOMCObjectFileInfo(TT); 839 break; 840 case Triple::COFF: 841 if (!TT.isOSWindows()) 842 report_fatal_error( 843 "Cannot initialize MC for non-Windows COFF object files."); 844 845 Env = IsCOFF; 846 initCOFFMCObjectFileInfo(TT); 847 break; 848 case Triple::ELF: 849 Env = IsELF; 850 initELFMCObjectFileInfo(TT, LargeCodeModel); 851 break; 852 case Triple::Wasm: 853 Env = IsWasm; 854 initWasmMCObjectFileInfo(TT); 855 break; 856 case Triple::XCOFF: 857 Env = IsXCOFF; 858 initXCOFFMCObjectFileInfo(TT); 859 break; 860 case Triple::UnknownObjectFormat: 861 report_fatal_error("Cannot initialize MC for unknown object file format."); 862 break; 863 } 864 } 865 866 MCSection *MCObjectFileInfo::getDwarfComdatSection(const char *Name, 867 uint64_t Hash) const { 868 switch (TT.getObjectFormat()) { 869 case Triple::ELF: 870 return Ctx->getELFSection(Name, ELF::SHT_PROGBITS, ELF::SHF_GROUP, 0, 871 utostr(Hash)); 872 case Triple::MachO: 873 case Triple::COFF: 874 case Triple::Wasm: 875 case Triple::XCOFF: 876 case Triple::UnknownObjectFormat: 877 report_fatal_error("Cannot get DWARF comdat section for this object file " 878 "format: not implemented."); 879 break; 880 } 881 llvm_unreachable("Unknown ObjectFormatType"); 882 } 883 884 MCSection * 885 MCObjectFileInfo::getStackSizesSection(const MCSection &TextSec) const { 886 if (Env != IsELF) 887 return StackSizesSection; 888 889 const MCSectionELF &ElfSec = static_cast<const MCSectionELF &>(TextSec); 890 unsigned Flags = ELF::SHF_LINK_ORDER; 891 StringRef GroupName; 892 if (const MCSymbol *Group = ElfSec.getGroup()) { 893 GroupName = Group->getName(); 894 Flags |= ELF::SHF_GROUP; 895 } 896 897 const MCSymbol *Link = TextSec.getBeginSymbol(); 898 auto It = StackSizesUniquing.insert({Link, StackSizesUniquing.size()}); 899 unsigned UniqueID = It.first->second; 900 901 return Ctx->getELFSection(".stack_sizes", ELF::SHT_PROGBITS, Flags, 0, 902 GroupName, UniqueID, cast<MCSymbolELF>(Link)); 903 } 904