1 //===-- MObjectFileInfo.cpp - Object File Information ---------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 #include "llvm/MC/MCObjectFileInfo.h" 11 #include "llvm/ADT/StringExtras.h" 12 #include "llvm/ADT/Triple.h" 13 #include "llvm/MC/MCAsmInfo.h" 14 #include "llvm/MC/MCContext.h" 15 #include "llvm/MC/MCSection.h" 16 #include "llvm/MC/MCSectionCOFF.h" 17 #include "llvm/MC/MCSectionELF.h" 18 #include "llvm/MC/MCSectionMachO.h" 19 #include "llvm/Support/COFF.h" 20 using namespace llvm; 21 22 static bool useCompactUnwind(const Triple &T) { 23 // Only on darwin. 24 if (!T.isOSDarwin()) 25 return false; 26 27 // aarch64 always has it. 28 if (T.getArch() == Triple::aarch64) 29 return true; 30 31 // Use it on newer version of OS X. 32 if (T.isMacOSX() && !T.isMacOSXVersionLT(10, 6)) 33 return true; 34 35 // And the iOS simulator. 36 if (T.isiOS() && 37 (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86)) 38 return true; 39 40 return false; 41 } 42 43 void MCObjectFileInfo::initMachOMCObjectFileInfo(Triple T) { 44 // MachO 45 SupportsWeakOmittedEHFrame = false; 46 47 if (T.isOSDarwin() && T.getArch() == Triple::aarch64) 48 SupportsCompactUnwindWithoutEHFrame = true; 49 50 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel 51 | dwarf::DW_EH_PE_sdata4; 52 LSDAEncoding = FDECFIEncoding = dwarf::DW_EH_PE_pcrel; 53 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 54 dwarf::DW_EH_PE_sdata4; 55 56 // .comm doesn't support alignment before Leopard. 57 if (T.isMacOSX() && T.isMacOSXVersionLT(10, 5)) 58 CommDirectiveSupportsAlignment = false; 59 60 TextSection // .text 61 = Ctx->getMachOSection("__TEXT", "__text", 62 MachO::S_ATTR_PURE_INSTRUCTIONS, 63 SectionKind::getText()); 64 DataSection // .data 65 = Ctx->getMachOSection("__DATA", "__data", 0, 66 SectionKind::getDataRel()); 67 68 // BSSSection might not be expected initialized on msvc. 69 BSSSection = nullptr; 70 71 TLSDataSection // .tdata 72 = Ctx->getMachOSection("__DATA", "__thread_data", 73 MachO::S_THREAD_LOCAL_REGULAR, 74 SectionKind::getDataRel()); 75 TLSBSSSection // .tbss 76 = Ctx->getMachOSection("__DATA", "__thread_bss", 77 MachO::S_THREAD_LOCAL_ZEROFILL, 78 SectionKind::getThreadBSS()); 79 80 // TODO: Verify datarel below. 81 TLSTLVSection // .tlv 82 = Ctx->getMachOSection("__DATA", "__thread_vars", 83 MachO::S_THREAD_LOCAL_VARIABLES, 84 SectionKind::getDataRel()); 85 86 TLSThreadInitSection 87 = Ctx->getMachOSection("__DATA", "__thread_init", 88 MachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS, 89 SectionKind::getDataRel()); 90 91 CStringSection // .cstring 92 = Ctx->getMachOSection("__TEXT", "__cstring", 93 MachO::S_CSTRING_LITERALS, 94 SectionKind::getMergeable1ByteCString()); 95 UStringSection 96 = Ctx->getMachOSection("__TEXT","__ustring", 0, 97 SectionKind::getMergeable2ByteCString()); 98 FourByteConstantSection // .literal4 99 = Ctx->getMachOSection("__TEXT", "__literal4", 100 MachO::S_4BYTE_LITERALS, 101 SectionKind::getMergeableConst4()); 102 EightByteConstantSection // .literal8 103 = Ctx->getMachOSection("__TEXT", "__literal8", 104 MachO::S_8BYTE_LITERALS, 105 SectionKind::getMergeableConst8()); 106 107 SixteenByteConstantSection // .literal16 108 = Ctx->getMachOSection("__TEXT", "__literal16", 109 MachO::S_16BYTE_LITERALS, 110 SectionKind::getMergeableConst16()); 111 112 ReadOnlySection // .const 113 = Ctx->getMachOSection("__TEXT", "__const", 0, 114 SectionKind::getReadOnly()); 115 116 TextCoalSection 117 = Ctx->getMachOSection("__TEXT", "__textcoal_nt", 118 MachO::S_COALESCED | 119 MachO::S_ATTR_PURE_INSTRUCTIONS, 120 SectionKind::getText()); 121 ConstTextCoalSection 122 = Ctx->getMachOSection("__TEXT", "__const_coal", 123 MachO::S_COALESCED, 124 SectionKind::getReadOnly()); 125 ConstDataSection // .const_data 126 = Ctx->getMachOSection("__DATA", "__const", 0, 127 SectionKind::getReadOnlyWithRel()); 128 DataCoalSection 129 = Ctx->getMachOSection("__DATA","__datacoal_nt", 130 MachO::S_COALESCED, 131 SectionKind::getDataRel()); 132 DataCommonSection 133 = Ctx->getMachOSection("__DATA","__common", 134 MachO::S_ZEROFILL, 135 SectionKind::getBSS()); 136 DataBSSSection 137 = Ctx->getMachOSection("__DATA","__bss", MachO::S_ZEROFILL, 138 SectionKind::getBSS()); 139 140 141 LazySymbolPointerSection 142 = Ctx->getMachOSection("__DATA", "__la_symbol_ptr", 143 MachO::S_LAZY_SYMBOL_POINTERS, 144 SectionKind::getMetadata()); 145 NonLazySymbolPointerSection 146 = Ctx->getMachOSection("__DATA", "__nl_symbol_ptr", 147 MachO::S_NON_LAZY_SYMBOL_POINTERS, 148 SectionKind::getMetadata()); 149 150 if (RelocM == Reloc::Static) { 151 StaticCtorSection 152 = Ctx->getMachOSection("__TEXT", "__constructor", 0, 153 SectionKind::getDataRel()); 154 StaticDtorSection 155 = Ctx->getMachOSection("__TEXT", "__destructor", 0, 156 SectionKind::getDataRel()); 157 } else { 158 StaticCtorSection 159 = Ctx->getMachOSection("__DATA", "__mod_init_func", 160 MachO::S_MOD_INIT_FUNC_POINTERS, 161 SectionKind::getDataRel()); 162 StaticDtorSection 163 = Ctx->getMachOSection("__DATA", "__mod_term_func", 164 MachO::S_MOD_TERM_FUNC_POINTERS, 165 SectionKind::getDataRel()); 166 } 167 168 // Exception Handling. 169 LSDASection = Ctx->getMachOSection("__TEXT", "__gcc_except_tab", 0, 170 SectionKind::getReadOnlyWithRel()); 171 172 COFFDebugSymbolsSection = nullptr; 173 174 if (useCompactUnwind(T)) { 175 CompactUnwindSection = 176 Ctx->getMachOSection("__LD", "__compact_unwind", MachO::S_ATTR_DEBUG, 177 SectionKind::getReadOnly()); 178 179 if (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86) 180 CompactUnwindDwarfEHFrameOnly = 0x04000000; 181 else if (T.getArch() == Triple::aarch64) 182 CompactUnwindDwarfEHFrameOnly = 0x03000000; 183 } 184 185 // Debug Information. 186 DwarfAccelNamesSection = 187 Ctx->getMachOSection("__DWARF", "__apple_names", MachO::S_ATTR_DEBUG, 188 SectionKind::getMetadata(), "names_begin"); 189 DwarfAccelObjCSection = 190 Ctx->getMachOSection("__DWARF", "__apple_objc", MachO::S_ATTR_DEBUG, 191 SectionKind::getMetadata(), "objc_begin"); 192 // 16 character section limit... 193 DwarfAccelNamespaceSection = 194 Ctx->getMachOSection("__DWARF", "__apple_namespac", MachO::S_ATTR_DEBUG, 195 SectionKind::getMetadata(), "namespac_begin"); 196 DwarfAccelTypesSection = 197 Ctx->getMachOSection("__DWARF", "__apple_types", MachO::S_ATTR_DEBUG, 198 SectionKind::getMetadata(), "types_begin"); 199 200 DwarfAbbrevSection = 201 Ctx->getMachOSection("__DWARF", "__debug_abbrev", MachO::S_ATTR_DEBUG, 202 SectionKind::getMetadata(), "section_abbrev"); 203 DwarfInfoSection = 204 Ctx->getMachOSection("__DWARF", "__debug_info", MachO::S_ATTR_DEBUG, 205 SectionKind::getMetadata(), "section_info"); 206 DwarfLineSection = 207 Ctx->getMachOSection("__DWARF", "__debug_line", MachO::S_ATTR_DEBUG, 208 SectionKind::getMetadata(), "section_line"); 209 DwarfFrameSection = 210 Ctx->getMachOSection("__DWARF", "__debug_frame", MachO::S_ATTR_DEBUG, 211 SectionKind::getMetadata()); 212 DwarfPubNamesSection = 213 Ctx->getMachOSection("__DWARF", "__debug_pubnames", MachO::S_ATTR_DEBUG, 214 SectionKind::getMetadata()); 215 DwarfPubTypesSection = 216 Ctx->getMachOSection("__DWARF", "__debug_pubtypes", MachO::S_ATTR_DEBUG, 217 SectionKind::getMetadata()); 218 DwarfGnuPubNamesSection = 219 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubn", MachO::S_ATTR_DEBUG, 220 SectionKind::getMetadata()); 221 DwarfGnuPubTypesSection = 222 Ctx->getMachOSection("__DWARF", "__debug_gnu_pubt", MachO::S_ATTR_DEBUG, 223 SectionKind::getMetadata()); 224 DwarfStrSection = 225 Ctx->getMachOSection("__DWARF", "__debug_str", MachO::S_ATTR_DEBUG, 226 SectionKind::getMetadata(), "info_string"); 227 DwarfLocSection = 228 Ctx->getMachOSection("__DWARF", "__debug_loc", MachO::S_ATTR_DEBUG, 229 SectionKind::getMetadata(), "section_debug_loc"); 230 DwarfARangesSection = 231 Ctx->getMachOSection("__DWARF", "__debug_aranges", MachO::S_ATTR_DEBUG, 232 SectionKind::getMetadata()); 233 DwarfRangesSection = 234 Ctx->getMachOSection("__DWARF", "__debug_ranges", MachO::S_ATTR_DEBUG, 235 SectionKind::getMetadata(), "debug_range"); 236 DwarfDebugInlineSection = 237 Ctx->getMachOSection("__DWARF", "__debug_inlined", MachO::S_ATTR_DEBUG, 238 SectionKind::getMetadata()); 239 StackMapSection = Ctx->getMachOSection("__LLVM_STACKMAPS", "__llvm_stackmaps", 240 0, SectionKind::getMetadata()); 241 242 FaultMapSection = Ctx->getMachOSection("__LLVM_FAULTMAPS", "__llvm_faultmaps", 243 0, SectionKind::getMetadata()); 244 245 TLSExtraDataSection = TLSTLVSection; 246 } 247 248 void MCObjectFileInfo::initELFMCObjectFileInfo(Triple T) { 249 switch (T.getArch()) { 250 case Triple::mips: 251 case Triple::mipsel: 252 FDECFIEncoding = dwarf::DW_EH_PE_sdata4; 253 break; 254 case Triple::mips64: 255 case Triple::mips64el: 256 FDECFIEncoding = dwarf::DW_EH_PE_sdata8; 257 break; 258 case Triple::x86_64: 259 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | 260 ((CMModel == CodeModel::Large) ? dwarf::DW_EH_PE_sdata8 261 : dwarf::DW_EH_PE_sdata4); 262 263 break; 264 default: 265 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 266 break; 267 } 268 269 switch (T.getArch()) { 270 case Triple::arm: 271 case Triple::armeb: 272 case Triple::thumb: 273 case Triple::thumbeb: 274 if (Ctx->getAsmInfo()->getExceptionHandlingType() == ExceptionHandling::ARM) 275 break; 276 // Fallthrough if not using EHABI 277 case Triple::ppc: 278 case Triple::x86: 279 PersonalityEncoding = (RelocM == Reloc::PIC_) 280 ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4 281 : dwarf::DW_EH_PE_absptr; 282 LSDAEncoding = (RelocM == Reloc::PIC_) 283 ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4 284 : dwarf::DW_EH_PE_absptr; 285 TTypeEncoding = (RelocM == Reloc::PIC_) 286 ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4 287 : dwarf::DW_EH_PE_absptr; 288 break; 289 case Triple::x86_64: 290 if (RelocM == Reloc::PIC_) { 291 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 292 ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium) 293 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8); 294 LSDAEncoding = dwarf::DW_EH_PE_pcrel | 295 (CMModel == CodeModel::Small 296 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8); 297 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 298 ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium) 299 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8); 300 } else { 301 PersonalityEncoding = 302 (CMModel == CodeModel::Small || CMModel == CodeModel::Medium) 303 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr; 304 LSDAEncoding = (CMModel == CodeModel::Small) 305 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr; 306 TTypeEncoding = (CMModel == CodeModel::Small) 307 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr; 308 } 309 break; 310 case Triple::aarch64: 311 case Triple::aarch64_be: 312 // The small model guarantees static code/data size < 4GB, but not where it 313 // will be in memory. Most of these could end up >2GB away so even a signed 314 // pc-relative 32-bit address is insufficient, theoretically. 315 if (RelocM == Reloc::PIC_) { 316 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 317 dwarf::DW_EH_PE_sdata8; 318 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8; 319 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 320 dwarf::DW_EH_PE_sdata8; 321 } else { 322 PersonalityEncoding = dwarf::DW_EH_PE_absptr; 323 LSDAEncoding = dwarf::DW_EH_PE_absptr; 324 TTypeEncoding = dwarf::DW_EH_PE_absptr; 325 } 326 break; 327 case Triple::mips: 328 case Triple::mipsel: 329 case Triple::mips64: 330 case Triple::mips64el: 331 // MIPS uses indirect pointer to refer personality functions and types, so 332 // that the eh_frame section can be read-only. DW.ref.personality will be 333 // generated for relocation. 334 PersonalityEncoding = dwarf::DW_EH_PE_indirect; 335 // FIXME: The N64 ABI probably ought to use DW_EH_PE_sdata8 but we can't 336 // identify N64 from just a triple. 337 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 338 dwarf::DW_EH_PE_sdata4; 339 // We don't support PC-relative LSDA references in GAS so we use the default 340 // DW_EH_PE_absptr for those. 341 break; 342 case Triple::ppc64: 343 case Triple::ppc64le: 344 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 345 dwarf::DW_EH_PE_udata8; 346 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8; 347 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 348 dwarf::DW_EH_PE_udata8; 349 break; 350 case Triple::sparcel: 351 case Triple::sparc: 352 if (RelocM == Reloc::PIC_) { 353 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 354 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 355 dwarf::DW_EH_PE_sdata4; 356 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 357 dwarf::DW_EH_PE_sdata4; 358 } else { 359 LSDAEncoding = dwarf::DW_EH_PE_absptr; 360 PersonalityEncoding = dwarf::DW_EH_PE_absptr; 361 TTypeEncoding = dwarf::DW_EH_PE_absptr; 362 } 363 break; 364 case Triple::sparcv9: 365 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 366 if (RelocM == Reloc::PIC_) { 367 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 368 dwarf::DW_EH_PE_sdata4; 369 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 370 dwarf::DW_EH_PE_sdata4; 371 } else { 372 PersonalityEncoding = dwarf::DW_EH_PE_absptr; 373 TTypeEncoding = dwarf::DW_EH_PE_absptr; 374 } 375 break; 376 case Triple::systemz: 377 // All currently-defined code models guarantee that 4-byte PC-relative 378 // values will be in range. 379 if (RelocM == Reloc::PIC_) { 380 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 381 dwarf::DW_EH_PE_sdata4; 382 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 383 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 384 dwarf::DW_EH_PE_sdata4; 385 } else { 386 PersonalityEncoding = dwarf::DW_EH_PE_absptr; 387 LSDAEncoding = dwarf::DW_EH_PE_absptr; 388 TTypeEncoding = dwarf::DW_EH_PE_absptr; 389 } 390 break; 391 default: 392 break; 393 } 394 395 // Solaris requires different flags for .eh_frame to seemingly every other 396 // platform. 397 EHSectionType = ELF::SHT_PROGBITS; 398 EHSectionFlags = ELF::SHF_ALLOC; 399 if (T.isOSSolaris()) { 400 if (T.getArch() == Triple::x86_64) 401 EHSectionType = ELF::SHT_X86_64_UNWIND; 402 else 403 EHSectionFlags |= ELF::SHF_WRITE; 404 } 405 406 407 // ELF 408 BSSSection = Ctx->getELFSection(".bss", ELF::SHT_NOBITS, 409 ELF::SHF_WRITE | ELF::SHF_ALLOC); 410 411 TextSection = Ctx->getELFSection(".text", ELF::SHT_PROGBITS, 412 ELF::SHF_EXECINSTR | ELF::SHF_ALLOC); 413 414 DataSection = Ctx->getELFSection(".data", ELF::SHT_PROGBITS, 415 ELF::SHF_WRITE | ELF::SHF_ALLOC); 416 417 ReadOnlySection = 418 Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); 419 420 TLSDataSection = 421 Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS, 422 ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE); 423 424 TLSBSSSection = Ctx->getELFSection( 425 ".tbss", ELF::SHT_NOBITS, ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE); 426 427 DataRelSection = Ctx->getELFSection(".data.rel", ELF::SHT_PROGBITS, 428 ELF::SHF_ALLOC | ELF::SHF_WRITE); 429 430 DataRelLocalSection = Ctx->getELFSection(".data.rel.local", ELF::SHT_PROGBITS, 431 ELF::SHF_ALLOC | ELF::SHF_WRITE); 432 433 DataRelROSection = Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS, 434 ELF::SHF_ALLOC | ELF::SHF_WRITE); 435 436 DataRelROLocalSection = Ctx->getELFSection( 437 ".data.rel.ro.local", ELF::SHT_PROGBITS, ELF::SHF_ALLOC | ELF::SHF_WRITE); 438 439 MergeableConst4Section = 440 Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS, 441 ELF::SHF_ALLOC | ELF::SHF_MERGE, 4, ""); 442 443 MergeableConst8Section = 444 Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS, 445 ELF::SHF_ALLOC | ELF::SHF_MERGE, 8, ""); 446 447 MergeableConst16Section = 448 Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS, 449 ELF::SHF_ALLOC | ELF::SHF_MERGE, 16, ""); 450 451 StaticCtorSection = Ctx->getELFSection(".ctors", ELF::SHT_PROGBITS, 452 ELF::SHF_ALLOC | ELF::SHF_WRITE); 453 454 StaticDtorSection = Ctx->getELFSection(".dtors", ELF::SHT_PROGBITS, 455 ELF::SHF_ALLOC | ELF::SHF_WRITE); 456 457 // Exception Handling Sections. 458 459 // FIXME: We're emitting LSDA info into a readonly section on ELF, even though 460 // it contains relocatable pointers. In PIC mode, this is probably a big 461 // runtime hit for C++ apps. Either the contents of the LSDA need to be 462 // adjusted or this should be a data section. 463 LSDASection = Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS, 464 ELF::SHF_ALLOC); 465 466 COFFDebugSymbolsSection = nullptr; 467 468 // Debug Info Sections. 469 DwarfAbbrevSection = Ctx->getELFSection(".debug_abbrev", ELF::SHT_PROGBITS, 0, 470 "section_abbrev"); 471 DwarfInfoSection = 472 Ctx->getELFSection(".debug_info", ELF::SHT_PROGBITS, 0, "section_info"); 473 DwarfLineSection = Ctx->getELFSection(".debug_line", ELF::SHT_PROGBITS, 0); 474 DwarfFrameSection = Ctx->getELFSection(".debug_frame", ELF::SHT_PROGBITS, 0); 475 DwarfPubNamesSection = 476 Ctx->getELFSection(".debug_pubnames", ELF::SHT_PROGBITS, 0); 477 DwarfPubTypesSection = 478 Ctx->getELFSection(".debug_pubtypes", ELF::SHT_PROGBITS, 0); 479 DwarfGnuPubNamesSection = 480 Ctx->getELFSection(".debug_gnu_pubnames", ELF::SHT_PROGBITS, 0); 481 DwarfGnuPubTypesSection = 482 Ctx->getELFSection(".debug_gnu_pubtypes", ELF::SHT_PROGBITS, 0); 483 DwarfStrSection = 484 Ctx->getELFSection(".debug_str", ELF::SHT_PROGBITS, 485 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, ""); 486 DwarfLocSection = Ctx->getELFSection(".debug_loc", ELF::SHT_PROGBITS, 0); 487 DwarfARangesSection = 488 Ctx->getELFSection(".debug_aranges", ELF::SHT_PROGBITS, 0); 489 DwarfRangesSection = 490 Ctx->getELFSection(".debug_ranges", ELF::SHT_PROGBITS, 0, "debug_range"); 491 492 // DWARF5 Experimental Debug Info 493 494 // Accelerator Tables 495 DwarfAccelNamesSection = 496 Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0, "names_begin"); 497 DwarfAccelObjCSection = 498 Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0, "objc_begin"); 499 DwarfAccelNamespaceSection = Ctx->getELFSection( 500 ".apple_namespaces", ELF::SHT_PROGBITS, 0, "namespac_begin"); 501 DwarfAccelTypesSection = 502 Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0, "types_begin"); 503 504 // Fission Sections 505 DwarfInfoDWOSection = 506 Ctx->getELFSection(".debug_info.dwo", ELF::SHT_PROGBITS, 0); 507 DwarfTypesDWOSection = 508 Ctx->getELFSection(".debug_types.dwo", ELF::SHT_PROGBITS, 0); 509 DwarfAbbrevDWOSection = 510 Ctx->getELFSection(".debug_abbrev.dwo", ELF::SHT_PROGBITS, 0); 511 DwarfStrDWOSection = 512 Ctx->getELFSection(".debug_str.dwo", ELF::SHT_PROGBITS, 513 ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, ""); 514 DwarfLineDWOSection = 515 Ctx->getELFSection(".debug_line.dwo", ELF::SHT_PROGBITS, 0); 516 DwarfLocDWOSection = 517 Ctx->getELFSection(".debug_loc.dwo", ELF::SHT_PROGBITS, 0, "skel_loc"); 518 DwarfStrOffDWOSection = 519 Ctx->getELFSection(".debug_str_offsets.dwo", ELF::SHT_PROGBITS, 0); 520 DwarfAddrSection = 521 Ctx->getELFSection(".debug_addr", ELF::SHT_PROGBITS, 0, "addr_sec"); 522 523 StackMapSection = 524 Ctx->getELFSection(".llvm_stackmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); 525 526 FaultMapSection = 527 Ctx->getELFSection(".llvm_faultmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); 528 } 529 530 void MCObjectFileInfo::initCOFFMCObjectFileInfo(Triple T) { 531 bool IsWoA = T.getArch() == Triple::arm || T.getArch() == Triple::thumb; 532 533 CommDirectiveSupportsAlignment = true; 534 535 // COFF 536 BSSSection = Ctx->getCOFFSection( 537 ".bss", COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA | 538 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE, 539 SectionKind::getBSS()); 540 TextSection = Ctx->getCOFFSection( 541 ".text", 542 (IsWoA ? COFF::IMAGE_SCN_MEM_16BIT : (COFF::SectionCharacteristics)0) | 543 COFF::IMAGE_SCN_CNT_CODE | COFF::IMAGE_SCN_MEM_EXECUTE | 544 COFF::IMAGE_SCN_MEM_READ, 545 SectionKind::getText()); 546 DataSection = Ctx->getCOFFSection( 547 ".data", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ | 548 COFF::IMAGE_SCN_MEM_WRITE, 549 SectionKind::getDataRel()); 550 ReadOnlySection = Ctx->getCOFFSection( 551 ".rdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, 552 SectionKind::getReadOnly()); 553 554 if (T.isKnownWindowsMSVCEnvironment() || T.isWindowsItaniumEnvironment()) { 555 StaticCtorSection = 556 Ctx->getCOFFSection(".CRT$XCU", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 557 COFF::IMAGE_SCN_MEM_READ, 558 SectionKind::getReadOnly()); 559 StaticDtorSection = 560 Ctx->getCOFFSection(".CRT$XTX", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 561 COFF::IMAGE_SCN_MEM_READ, 562 SectionKind::getReadOnly()); 563 } else { 564 StaticCtorSection = Ctx->getCOFFSection( 565 ".ctors", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 566 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE, 567 SectionKind::getDataRel()); 568 StaticDtorSection = Ctx->getCOFFSection( 569 ".dtors", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 570 COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE, 571 SectionKind::getDataRel()); 572 } 573 574 // FIXME: We're emitting LSDA info into a readonly section on COFF, even 575 // though it contains relocatable pointers. In PIC mode, this is probably a 576 // big runtime hit for C++ apps. Either the contents of the LSDA need to be 577 // adjusted or this should be a data section. 578 assert(T.isOSWindows() && "Windows is the only supported COFF target"); 579 if (T.getArch() == Triple::x86_64) { 580 // On Windows 64 with SEH, the LSDA is emitted into the .xdata section 581 LSDASection = 0; 582 } else { 583 LSDASection = Ctx->getCOFFSection(".gcc_except_table", 584 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 585 COFF::IMAGE_SCN_MEM_READ, 586 SectionKind::getReadOnly()); 587 } 588 589 // Debug info. 590 COFFDebugSymbolsSection = 591 Ctx->getCOFFSection(".debug$S", COFF::IMAGE_SCN_MEM_DISCARDABLE | 592 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 593 COFF::IMAGE_SCN_MEM_READ, 594 SectionKind::getMetadata()); 595 596 DwarfAbbrevSection = Ctx->getCOFFSection( 597 ".debug_abbrev", 598 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 599 COFF::IMAGE_SCN_MEM_READ, 600 SectionKind::getMetadata(), "section_abbrev"); 601 DwarfInfoSection = Ctx->getCOFFSection( 602 ".debug_info", 603 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 604 COFF::IMAGE_SCN_MEM_READ, 605 SectionKind::getMetadata(), "section_info"); 606 DwarfLineSection = Ctx->getCOFFSection( 607 ".debug_line", 608 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 609 COFF::IMAGE_SCN_MEM_READ, 610 SectionKind::getMetadata(), "section_line"); 611 612 DwarfFrameSection = Ctx->getCOFFSection( 613 ".debug_frame", 614 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 615 COFF::IMAGE_SCN_MEM_READ, 616 SectionKind::getMetadata()); 617 DwarfPubNamesSection = Ctx->getCOFFSection( 618 ".debug_pubnames", 619 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 620 COFF::IMAGE_SCN_MEM_READ, 621 SectionKind::getMetadata()); 622 DwarfPubTypesSection = Ctx->getCOFFSection( 623 ".debug_pubtypes", 624 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 625 COFF::IMAGE_SCN_MEM_READ, 626 SectionKind::getMetadata()); 627 DwarfGnuPubNamesSection = Ctx->getCOFFSection( 628 ".debug_gnu_pubnames", 629 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 630 COFF::IMAGE_SCN_MEM_READ, 631 SectionKind::getMetadata()); 632 DwarfGnuPubTypesSection = Ctx->getCOFFSection( 633 ".debug_gnu_pubtypes", 634 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 635 COFF::IMAGE_SCN_MEM_READ, 636 SectionKind::getMetadata()); 637 DwarfStrSection = Ctx->getCOFFSection( 638 ".debug_str", 639 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 640 COFF::IMAGE_SCN_MEM_READ, 641 SectionKind::getMetadata(), "info_string"); 642 DwarfLocSection = Ctx->getCOFFSection( 643 ".debug_loc", 644 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 645 COFF::IMAGE_SCN_MEM_READ, 646 SectionKind::getMetadata(), "section_debug_loc"); 647 DwarfARangesSection = Ctx->getCOFFSection( 648 ".debug_aranges", 649 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 650 COFF::IMAGE_SCN_MEM_READ, 651 SectionKind::getMetadata()); 652 DwarfRangesSection = Ctx->getCOFFSection( 653 ".debug_ranges", 654 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 655 COFF::IMAGE_SCN_MEM_READ, 656 SectionKind::getMetadata(), "debug_range"); 657 DwarfInfoDWOSection = Ctx->getCOFFSection( 658 ".debug_info.dwo", 659 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 660 COFF::IMAGE_SCN_MEM_READ, 661 SectionKind::getMetadata(), "section_info_dwo"); 662 DwarfTypesDWOSection = Ctx->getCOFFSection( 663 ".debug_types.dwo", 664 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 665 COFF::IMAGE_SCN_MEM_READ, 666 SectionKind::getMetadata(), "section_types_dwo"); 667 DwarfAbbrevDWOSection = Ctx->getCOFFSection( 668 ".debug_abbrev.dwo", 669 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 670 COFF::IMAGE_SCN_MEM_READ, 671 SectionKind::getMetadata(), "section_abbrev_dwo"); 672 DwarfStrDWOSection = Ctx->getCOFFSection( 673 ".debug_str.dwo", 674 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 675 COFF::IMAGE_SCN_MEM_READ, 676 SectionKind::getMetadata(), "skel_string"); 677 DwarfLineDWOSection = Ctx->getCOFFSection( 678 ".debug_line.dwo", 679 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 680 COFF::IMAGE_SCN_MEM_READ, 681 SectionKind::getMetadata()); 682 DwarfLocDWOSection = Ctx->getCOFFSection( 683 ".debug_loc.dwo", 684 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 685 COFF::IMAGE_SCN_MEM_READ, 686 SectionKind::getMetadata(), "skel_loc"); 687 DwarfStrOffDWOSection = Ctx->getCOFFSection( 688 ".debug_str_offsets.dwo", 689 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 690 COFF::IMAGE_SCN_MEM_READ, 691 SectionKind::getMetadata()); 692 DwarfAddrSection = Ctx->getCOFFSection( 693 ".debug_addr", 694 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 695 COFF::IMAGE_SCN_MEM_READ, 696 SectionKind::getMetadata(), "addr_sec"); 697 DwarfAccelNamesSection = Ctx->getCOFFSection( 698 ".apple_names", 699 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 700 COFF::IMAGE_SCN_MEM_READ, 701 SectionKind::getMetadata(), "names_begin"); 702 DwarfAccelNamespaceSection = Ctx->getCOFFSection( 703 ".apple_namespaces", 704 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 705 COFF::IMAGE_SCN_MEM_READ, 706 SectionKind::getMetadata(), "namespac_begin"); 707 DwarfAccelTypesSection = Ctx->getCOFFSection( 708 ".apple_types", 709 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 710 COFF::IMAGE_SCN_MEM_READ, 711 SectionKind::getMetadata(), "types_begin"); 712 DwarfAccelObjCSection = Ctx->getCOFFSection( 713 ".apple_objc", 714 COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 715 COFF::IMAGE_SCN_MEM_READ, 716 SectionKind::getMetadata(), "objc_begin"); 717 718 DrectveSection = Ctx->getCOFFSection( 719 ".drectve", COFF::IMAGE_SCN_LNK_INFO | COFF::IMAGE_SCN_LNK_REMOVE, 720 SectionKind::getMetadata()); 721 722 PDataSection = Ctx->getCOFFSection( 723 ".pdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, 724 SectionKind::getDataRel()); 725 726 XDataSection = Ctx->getCOFFSection( 727 ".xdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, 728 SectionKind::getDataRel()); 729 730 SXDataSection = Ctx->getCOFFSection(".sxdata", COFF::IMAGE_SCN_LNK_INFO, 731 SectionKind::getMetadata()); 732 733 TLSDataSection = Ctx->getCOFFSection( 734 ".tls$", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ | 735 COFF::IMAGE_SCN_MEM_WRITE, 736 SectionKind::getDataRel()); 737 738 StackMapSection = Ctx->getCOFFSection(".llvm_stackmaps", 739 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 740 COFF::IMAGE_SCN_MEM_READ, 741 SectionKind::getReadOnly()); 742 } 743 744 void MCObjectFileInfo::InitMCObjectFileInfo(const Triple &TheTriple, 745 Reloc::Model relocm, 746 CodeModel::Model cm, 747 MCContext &ctx) { 748 RelocM = relocm; 749 CMModel = cm; 750 Ctx = &ctx; 751 752 // Common. 753 CommDirectiveSupportsAlignment = true; 754 SupportsWeakOmittedEHFrame = true; 755 SupportsCompactUnwindWithoutEHFrame = false; 756 757 PersonalityEncoding = LSDAEncoding = FDECFIEncoding = TTypeEncoding = 758 dwarf::DW_EH_PE_absptr; 759 760 CompactUnwindDwarfEHFrameOnly = 0; 761 762 EHFrameSection = nullptr; // Created on demand. 763 CompactUnwindSection = nullptr; // Used only by selected targets. 764 DwarfAccelNamesSection = nullptr; // Used only by selected targets. 765 DwarfAccelObjCSection = nullptr; // Used only by selected targets. 766 DwarfAccelNamespaceSection = nullptr; // Used only by selected targets. 767 DwarfAccelTypesSection = nullptr; // Used only by selected targets. 768 769 TT = TheTriple; 770 771 Triple::ArchType Arch = TT.getArch(); 772 // FIXME: Checking for Arch here to filter out bogus triples such as 773 // cellspu-apple-darwin. Perhaps we should fix in Triple? 774 if ((Arch == Triple::x86 || Arch == Triple::x86_64 || 775 Arch == Triple::arm || Arch == Triple::thumb || 776 Arch == Triple::aarch64 || 777 Arch == Triple::ppc || Arch == Triple::ppc64 || 778 Arch == Triple::UnknownArch) && 779 TT.isOSBinFormatMachO()) { 780 Env = IsMachO; 781 initMachOMCObjectFileInfo(TT); 782 } else if ((Arch == Triple::x86 || Arch == Triple::x86_64 || 783 Arch == Triple::arm || Arch == Triple::thumb) && 784 (TT.isOSWindows() && TT.getObjectFormat() == Triple::COFF)) { 785 Env = IsCOFF; 786 initCOFFMCObjectFileInfo(TT); 787 } else { 788 Env = IsELF; 789 initELFMCObjectFileInfo(TT); 790 } 791 } 792 793 void MCObjectFileInfo::InitMCObjectFileInfo(StringRef TT, Reloc::Model RM, 794 CodeModel::Model CM, 795 MCContext &ctx) { 796 InitMCObjectFileInfo(Triple(TT), RM, CM, ctx); 797 } 798 799 MCSection *MCObjectFileInfo::getDwarfTypesSection(uint64_t Hash) const { 800 return Ctx->getELFSection(".debug_types", ELF::SHT_PROGBITS, ELF::SHF_GROUP, 801 0, utostr(Hash)); 802 } 803 804 void MCObjectFileInfo::InitEHFrameSection() { 805 if (Env == IsMachO) 806 EHFrameSection = 807 Ctx->getMachOSection("__TEXT", "__eh_frame", 808 MachO::S_COALESCED | 809 MachO::S_ATTR_NO_TOC | 810 MachO::S_ATTR_STRIP_STATIC_SYMS | 811 MachO::S_ATTR_LIVE_SUPPORT, 812 SectionKind::getReadOnly()); 813 else if (Env == IsELF) 814 EHFrameSection = 815 Ctx->getELFSection(".eh_frame", EHSectionType, EHSectionFlags); 816 else 817 EHFrameSection = 818 Ctx->getCOFFSection(".eh_frame", 819 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 820 COFF::IMAGE_SCN_MEM_READ | 821 COFF::IMAGE_SCN_MEM_WRITE, 822 SectionKind::getDataRel()); 823 } 824