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/Triple.h" 12 #include "llvm/MC/MCContext.h" 13 #include "llvm/MC/MCSection.h" 14 #include "llvm/MC/MCSectionCOFF.h" 15 #include "llvm/MC/MCSectionELF.h" 16 #include "llvm/MC/MCSectionMachO.h" 17 using namespace llvm; 18 19 void MCObjectFileInfo::InitMachOMCObjectFileInfo(Triple T) { 20 // MachO 21 IsFunctionEHFrameSymbolPrivate = false; 22 SupportsWeakOmittedEHFrame = false; 23 24 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel 25 | dwarf::DW_EH_PE_sdata4; 26 LSDAEncoding = FDEEncoding = FDECFIEncoding = dwarf::DW_EH_PE_pcrel; 27 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 28 dwarf::DW_EH_PE_sdata4; 29 30 // .comm doesn't support alignment before Leopard. 31 if (T.isMacOSX() && T.isMacOSXVersionLT(10, 5)) 32 CommDirectiveSupportsAlignment = false; 33 34 TextSection // .text 35 = Ctx->getMachOSection("__TEXT", "__text", 36 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS, 37 SectionKind::getText()); 38 DataSection // .data 39 = Ctx->getMachOSection("__DATA", "__data", 0, 40 SectionKind::getDataRel()); 41 42 TLSDataSection // .tdata 43 = Ctx->getMachOSection("__DATA", "__thread_data", 44 MCSectionMachO::S_THREAD_LOCAL_REGULAR, 45 SectionKind::getDataRel()); 46 TLSBSSSection // .tbss 47 = Ctx->getMachOSection("__DATA", "__thread_bss", 48 MCSectionMachO::S_THREAD_LOCAL_ZEROFILL, 49 SectionKind::getThreadBSS()); 50 51 // TODO: Verify datarel below. 52 TLSTLVSection // .tlv 53 = Ctx->getMachOSection("__DATA", "__thread_vars", 54 MCSectionMachO::S_THREAD_LOCAL_VARIABLES, 55 SectionKind::getDataRel()); 56 57 TLSThreadInitSection 58 = Ctx->getMachOSection("__DATA", "__thread_init", 59 MCSectionMachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS, 60 SectionKind::getDataRel()); 61 62 CStringSection // .cstring 63 = Ctx->getMachOSection("__TEXT", "__cstring", 64 MCSectionMachO::S_CSTRING_LITERALS, 65 SectionKind::getMergeable1ByteCString()); 66 UStringSection 67 = Ctx->getMachOSection("__TEXT","__ustring", 0, 68 SectionKind::getMergeable2ByteCString()); 69 FourByteConstantSection // .literal4 70 = Ctx->getMachOSection("__TEXT", "__literal4", 71 MCSectionMachO::S_4BYTE_LITERALS, 72 SectionKind::getMergeableConst4()); 73 EightByteConstantSection // .literal8 74 = Ctx->getMachOSection("__TEXT", "__literal8", 75 MCSectionMachO::S_8BYTE_LITERALS, 76 SectionKind::getMergeableConst8()); 77 78 // ld_classic doesn't support .literal16 in 32-bit mode, and ld64 falls back 79 // to using it in -static mode. 80 SixteenByteConstantSection = 0; 81 if (RelocM != Reloc::Static && 82 T.getArch() != Triple::x86_64 && T.getArch() != Triple::ppc64 && 83 T.getArch() != Triple::ppc64le) 84 SixteenByteConstantSection = // .literal16 85 Ctx->getMachOSection("__TEXT", "__literal16", 86 MCSectionMachO::S_16BYTE_LITERALS, 87 SectionKind::getMergeableConst16()); 88 89 ReadOnlySection // .const 90 = Ctx->getMachOSection("__TEXT", "__const", 0, 91 SectionKind::getReadOnly()); 92 93 TextCoalSection 94 = Ctx->getMachOSection("__TEXT", "__textcoal_nt", 95 MCSectionMachO::S_COALESCED | 96 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS, 97 SectionKind::getText()); 98 ConstTextCoalSection 99 = Ctx->getMachOSection("__TEXT", "__const_coal", 100 MCSectionMachO::S_COALESCED, 101 SectionKind::getReadOnly()); 102 ConstDataSection // .const_data 103 = Ctx->getMachOSection("__DATA", "__const", 0, 104 SectionKind::getReadOnlyWithRel()); 105 DataCoalSection 106 = Ctx->getMachOSection("__DATA","__datacoal_nt", 107 MCSectionMachO::S_COALESCED, 108 SectionKind::getDataRel()); 109 DataCommonSection 110 = Ctx->getMachOSection("__DATA","__common", 111 MCSectionMachO::S_ZEROFILL, 112 SectionKind::getBSS()); 113 DataBSSSection 114 = Ctx->getMachOSection("__DATA","__bss", MCSectionMachO::S_ZEROFILL, 115 SectionKind::getBSS()); 116 117 118 LazySymbolPointerSection 119 = Ctx->getMachOSection("__DATA", "__la_symbol_ptr", 120 MCSectionMachO::S_LAZY_SYMBOL_POINTERS, 121 SectionKind::getMetadata()); 122 NonLazySymbolPointerSection 123 = Ctx->getMachOSection("__DATA", "__nl_symbol_ptr", 124 MCSectionMachO::S_NON_LAZY_SYMBOL_POINTERS, 125 SectionKind::getMetadata()); 126 127 if (RelocM == Reloc::Static) { 128 StaticCtorSection 129 = Ctx->getMachOSection("__TEXT", "__constructor", 0, 130 SectionKind::getDataRel()); 131 StaticDtorSection 132 = Ctx->getMachOSection("__TEXT", "__destructor", 0, 133 SectionKind::getDataRel()); 134 } else { 135 StaticCtorSection 136 = Ctx->getMachOSection("__DATA", "__mod_init_func", 137 MCSectionMachO::S_MOD_INIT_FUNC_POINTERS, 138 SectionKind::getDataRel()); 139 StaticDtorSection 140 = Ctx->getMachOSection("__DATA", "__mod_term_func", 141 MCSectionMachO::S_MOD_TERM_FUNC_POINTERS, 142 SectionKind::getDataRel()); 143 } 144 145 // Exception Handling. 146 LSDASection = Ctx->getMachOSection("__TEXT", "__gcc_except_tab", 0, 147 SectionKind::getReadOnlyWithRel()); 148 149 if (T.isMacOSX() && !T.isMacOSXVersionLT(10, 6)) { 150 CompactUnwindSection = 151 Ctx->getMachOSection("__LD", "__compact_unwind", 152 MCSectionMachO::S_ATTR_DEBUG, 153 SectionKind::getReadOnly()); 154 155 if (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86) 156 CompactUnwindDwarfEHFrameOnly = 0x04000000; 157 } 158 159 // Debug Information. 160 DwarfAccelNamesSection = 161 Ctx->getMachOSection("__DWARF", "__apple_names", 162 MCSectionMachO::S_ATTR_DEBUG, 163 SectionKind::getMetadata()); 164 DwarfAccelObjCSection = 165 Ctx->getMachOSection("__DWARF", "__apple_objc", 166 MCSectionMachO::S_ATTR_DEBUG, 167 SectionKind::getMetadata()); 168 // 16 character section limit... 169 DwarfAccelNamespaceSection = 170 Ctx->getMachOSection("__DWARF", "__apple_namespac", 171 MCSectionMachO::S_ATTR_DEBUG, 172 SectionKind::getMetadata()); 173 DwarfAccelTypesSection = 174 Ctx->getMachOSection("__DWARF", "__apple_types", 175 MCSectionMachO::S_ATTR_DEBUG, 176 SectionKind::getMetadata()); 177 178 DwarfAbbrevSection = 179 Ctx->getMachOSection("__DWARF", "__debug_abbrev", 180 MCSectionMachO::S_ATTR_DEBUG, 181 SectionKind::getMetadata()); 182 DwarfInfoSection = 183 Ctx->getMachOSection("__DWARF", "__debug_info", 184 MCSectionMachO::S_ATTR_DEBUG, 185 SectionKind::getMetadata()); 186 DwarfLineSection = 187 Ctx->getMachOSection("__DWARF", "__debug_line", 188 MCSectionMachO::S_ATTR_DEBUG, 189 SectionKind::getMetadata()); 190 DwarfFrameSection = 191 Ctx->getMachOSection("__DWARF", "__debug_frame", 192 MCSectionMachO::S_ATTR_DEBUG, 193 SectionKind::getMetadata()); 194 DwarfPubNamesSection = 195 Ctx->getMachOSection("__DWARF", "__debug_pubnames", 196 MCSectionMachO::S_ATTR_DEBUG, 197 SectionKind::getMetadata()); 198 DwarfPubTypesSection = 199 Ctx->getMachOSection("__DWARF", "__debug_pubtypes", 200 MCSectionMachO::S_ATTR_DEBUG, 201 SectionKind::getMetadata()); 202 DwarfStrSection = 203 Ctx->getMachOSection("__DWARF", "__debug_str", 204 MCSectionMachO::S_ATTR_DEBUG, 205 SectionKind::getMetadata()); 206 DwarfLocSection = 207 Ctx->getMachOSection("__DWARF", "__debug_loc", 208 MCSectionMachO::S_ATTR_DEBUG, 209 SectionKind::getMetadata()); 210 DwarfARangesSection = 211 Ctx->getMachOSection("__DWARF", "__debug_aranges", 212 MCSectionMachO::S_ATTR_DEBUG, 213 SectionKind::getMetadata()); 214 DwarfRangesSection = 215 Ctx->getMachOSection("__DWARF", "__debug_ranges", 216 MCSectionMachO::S_ATTR_DEBUG, 217 SectionKind::getMetadata()); 218 DwarfMacroInfoSection = 219 Ctx->getMachOSection("__DWARF", "__debug_macinfo", 220 MCSectionMachO::S_ATTR_DEBUG, 221 SectionKind::getMetadata()); 222 DwarfDebugInlineSection = 223 Ctx->getMachOSection("__DWARF", "__debug_inlined", 224 MCSectionMachO::S_ATTR_DEBUG, 225 SectionKind::getMetadata()); 226 227 TLSExtraDataSection = TLSTLVSection; 228 } 229 230 void MCObjectFileInfo::InitELFMCObjectFileInfo(Triple T) { 231 if (T.getArch() == Triple::mips || 232 T.getArch() == Triple::mipsel) 233 FDECFIEncoding = dwarf::DW_EH_PE_sdata4; 234 else if (T.getArch() == Triple::mips64 || 235 T.getArch() == Triple::mips64el) 236 FDECFIEncoding = dwarf::DW_EH_PE_sdata8; 237 else 238 FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 239 240 if (T.getArch() == Triple::x86) { 241 PersonalityEncoding = (RelocM == Reloc::PIC_) 242 ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4 243 : dwarf::DW_EH_PE_absptr; 244 LSDAEncoding = (RelocM == Reloc::PIC_) 245 ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4 246 : dwarf::DW_EH_PE_absptr; 247 FDEEncoding = (RelocM == Reloc::PIC_) 248 ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4 249 : dwarf::DW_EH_PE_absptr; 250 TTypeEncoding = (RelocM == Reloc::PIC_) 251 ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4 252 : dwarf::DW_EH_PE_absptr; 253 } else if (T.getArch() == Triple::x86_64) { 254 if (RelocM == Reloc::PIC_) { 255 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 256 ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium) 257 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8); 258 LSDAEncoding = dwarf::DW_EH_PE_pcrel | 259 (CMModel == CodeModel::Small 260 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8); 261 FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 262 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 263 ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium) 264 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8); 265 } else { 266 PersonalityEncoding = 267 (CMModel == CodeModel::Small || CMModel == CodeModel::Medium) 268 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr; 269 LSDAEncoding = (CMModel == CodeModel::Small) 270 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr; 271 FDEEncoding = dwarf::DW_EH_PE_udata4; 272 TTypeEncoding = (CMModel == CodeModel::Small) 273 ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr; 274 } 275 } else if (T.getArch() == Triple::aarch64) { 276 // The small model guarantees static code/data size < 4GB, but not where it 277 // will be in memory. Most of these could end up >2GB away so even a signed 278 // pc-relative 32-bit address is insufficient, theoretically. 279 if (RelocM == Reloc::PIC_) { 280 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 281 dwarf::DW_EH_PE_sdata8; 282 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8; 283 FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 284 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 285 dwarf::DW_EH_PE_sdata8; 286 } else { 287 PersonalityEncoding = dwarf::DW_EH_PE_absptr; 288 LSDAEncoding = dwarf::DW_EH_PE_absptr; 289 FDEEncoding = dwarf::DW_EH_PE_udata4; 290 TTypeEncoding = dwarf::DW_EH_PE_absptr; 291 } 292 } else if (T.getArch() == Triple::ppc64 || T.getArch() == Triple::ppc64le) { 293 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 294 dwarf::DW_EH_PE_udata8; 295 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8; 296 FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8; 297 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 298 dwarf::DW_EH_PE_udata8; 299 } else if (T.getArch() == Triple::systemz) { 300 // All currently-defined code models guarantee that 4-byte PC-relative 301 // values will be in range. 302 if (RelocM == Reloc::PIC_) { 303 PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 304 dwarf::DW_EH_PE_sdata4; 305 LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 306 FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 307 TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | 308 dwarf::DW_EH_PE_sdata4; 309 } else { 310 PersonalityEncoding = dwarf::DW_EH_PE_absptr; 311 LSDAEncoding = dwarf::DW_EH_PE_absptr; 312 FDEEncoding = dwarf::DW_EH_PE_absptr; 313 TTypeEncoding = dwarf::DW_EH_PE_absptr; 314 } 315 } 316 317 // Solaris requires different flags for .eh_frame to seemingly every other 318 // platform. 319 EHSectionType = ELF::SHT_PROGBITS; 320 EHSectionFlags = ELF::SHF_ALLOC; 321 if (T.getOS() == Triple::Solaris) { 322 if (T.getArch() == Triple::x86_64) 323 EHSectionType = ELF::SHT_X86_64_UNWIND; 324 else 325 EHSectionFlags |= ELF::SHF_WRITE; 326 } 327 328 329 // ELF 330 BSSSection = 331 Ctx->getELFSection(".bss", ELF::SHT_NOBITS, 332 ELF::SHF_WRITE | ELF::SHF_ALLOC, 333 SectionKind::getBSS()); 334 335 TextSection = 336 Ctx->getELFSection(".text", ELF::SHT_PROGBITS, 337 ELF::SHF_EXECINSTR | 338 ELF::SHF_ALLOC, 339 SectionKind::getText()); 340 341 DataSection = 342 Ctx->getELFSection(".data", ELF::SHT_PROGBITS, 343 ELF::SHF_WRITE |ELF::SHF_ALLOC, 344 SectionKind::getDataRel()); 345 346 ReadOnlySection = 347 Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS, 348 ELF::SHF_ALLOC, 349 SectionKind::getReadOnly()); 350 351 TLSDataSection = 352 Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS, 353 ELF::SHF_ALLOC | ELF::SHF_TLS | 354 ELF::SHF_WRITE, 355 SectionKind::getThreadData()); 356 357 TLSBSSSection = 358 Ctx->getELFSection(".tbss", ELF::SHT_NOBITS, 359 ELF::SHF_ALLOC | ELF::SHF_TLS | 360 ELF::SHF_WRITE, 361 SectionKind::getThreadBSS()); 362 363 DataRelSection = 364 Ctx->getELFSection(".data.rel", ELF::SHT_PROGBITS, 365 ELF::SHF_ALLOC |ELF::SHF_WRITE, 366 SectionKind::getDataRel()); 367 368 DataRelLocalSection = 369 Ctx->getELFSection(".data.rel.local", ELF::SHT_PROGBITS, 370 ELF::SHF_ALLOC |ELF::SHF_WRITE, 371 SectionKind::getDataRelLocal()); 372 373 DataRelROSection = 374 Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS, 375 ELF::SHF_ALLOC |ELF::SHF_WRITE, 376 SectionKind::getReadOnlyWithRel()); 377 378 DataRelROLocalSection = 379 Ctx->getELFSection(".data.rel.ro.local", ELF::SHT_PROGBITS, 380 ELF::SHF_ALLOC |ELF::SHF_WRITE, 381 SectionKind::getReadOnlyWithRelLocal()); 382 383 MergeableConst4Section = 384 Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS, 385 ELF::SHF_ALLOC |ELF::SHF_MERGE, 386 SectionKind::getMergeableConst4()); 387 388 MergeableConst8Section = 389 Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS, 390 ELF::SHF_ALLOC |ELF::SHF_MERGE, 391 SectionKind::getMergeableConst8()); 392 393 MergeableConst16Section = 394 Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS, 395 ELF::SHF_ALLOC |ELF::SHF_MERGE, 396 SectionKind::getMergeableConst16()); 397 398 StaticCtorSection = 399 Ctx->getELFSection(".ctors", ELF::SHT_PROGBITS, 400 ELF::SHF_ALLOC |ELF::SHF_WRITE, 401 SectionKind::getDataRel()); 402 403 StaticDtorSection = 404 Ctx->getELFSection(".dtors", ELF::SHT_PROGBITS, 405 ELF::SHF_ALLOC |ELF::SHF_WRITE, 406 SectionKind::getDataRel()); 407 408 // Exception Handling Sections. 409 410 // FIXME: We're emitting LSDA info into a readonly section on ELF, even though 411 // it contains relocatable pointers. In PIC mode, this is probably a big 412 // runtime hit for C++ apps. Either the contents of the LSDA need to be 413 // adjusted or this should be a data section. 414 LSDASection = 415 Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS, 416 ELF::SHF_ALLOC, 417 SectionKind::getReadOnly()); 418 419 // Debug Info Sections. 420 DwarfAbbrevSection = 421 Ctx->getELFSection(".debug_abbrev", ELF::SHT_PROGBITS, 0, 422 SectionKind::getMetadata()); 423 DwarfInfoSection = 424 Ctx->getELFSection(".debug_info", ELF::SHT_PROGBITS, 0, 425 SectionKind::getMetadata()); 426 DwarfLineSection = 427 Ctx->getELFSection(".debug_line", ELF::SHT_PROGBITS, 0, 428 SectionKind::getMetadata()); 429 DwarfFrameSection = 430 Ctx->getELFSection(".debug_frame", ELF::SHT_PROGBITS, 0, 431 SectionKind::getMetadata()); 432 DwarfPubNamesSection = 433 Ctx->getELFSection(".debug_pubnames", ELF::SHT_PROGBITS, 0, 434 SectionKind::getMetadata()); 435 DwarfPubTypesSection = 436 Ctx->getELFSection(".debug_pubtypes", ELF::SHT_PROGBITS, 0, 437 SectionKind::getMetadata()); 438 DwarfStrSection = 439 Ctx->getELFSection(".debug_str", ELF::SHT_PROGBITS, 440 ELF::SHF_MERGE | ELF::SHF_STRINGS, 441 SectionKind::getMergeable1ByteCString()); 442 DwarfLocSection = 443 Ctx->getELFSection(".debug_loc", ELF::SHT_PROGBITS, 0, 444 SectionKind::getMetadata()); 445 DwarfARangesSection = 446 Ctx->getELFSection(".debug_aranges", ELF::SHT_PROGBITS, 0, 447 SectionKind::getMetadata()); 448 DwarfRangesSection = 449 Ctx->getELFSection(".debug_ranges", ELF::SHT_PROGBITS, 0, 450 SectionKind::getMetadata()); 451 DwarfMacroInfoSection = 452 Ctx->getELFSection(".debug_macinfo", ELF::SHT_PROGBITS, 0, 453 SectionKind::getMetadata()); 454 455 // DWARF5 Experimental Debug Info 456 457 // Accelerator Tables 458 DwarfAccelNamesSection = 459 Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0, 460 SectionKind::getMetadata()); 461 DwarfAccelObjCSection = 462 Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0, 463 SectionKind::getMetadata()); 464 DwarfAccelNamespaceSection = 465 Ctx->getELFSection(".apple_namespaces", ELF::SHT_PROGBITS, 0, 466 SectionKind::getMetadata()); 467 DwarfAccelTypesSection = 468 Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0, 469 SectionKind::getMetadata()); 470 471 // Fission Sections 472 DwarfInfoDWOSection = 473 Ctx->getELFSection(".debug_info.dwo", ELF::SHT_PROGBITS, 0, 474 SectionKind::getMetadata()); 475 DwarfAbbrevDWOSection = 476 Ctx->getELFSection(".debug_abbrev.dwo", ELF::SHT_PROGBITS, 0, 477 SectionKind::getMetadata()); 478 DwarfStrDWOSection = 479 Ctx->getELFSection(".debug_str.dwo", ELF::SHT_PROGBITS, 480 ELF::SHF_MERGE | ELF::SHF_STRINGS, 481 SectionKind::getMergeable1ByteCString()); 482 DwarfLineDWOSection = 483 Ctx->getELFSection(".debug_line.dwo", ELF::SHT_PROGBITS, 0, 484 SectionKind::getMetadata()); 485 DwarfLocDWOSection = 486 Ctx->getELFSection(".debug_loc.dwo", ELF::SHT_PROGBITS, 0, 487 SectionKind::getMetadata()); 488 DwarfStrOffDWOSection = 489 Ctx->getELFSection(".debug_str_offsets.dwo", ELF::SHT_PROGBITS, 0, 490 SectionKind::getMetadata()); 491 DwarfAddrSection = 492 Ctx->getELFSection(".debug_addr", ELF::SHT_PROGBITS, 0, 493 SectionKind::getMetadata()); 494 } 495 496 497 void MCObjectFileInfo::InitCOFFMCObjectFileInfo(Triple T) { 498 // COFF 499 TextSection = 500 Ctx->getCOFFSection(".text", 501 COFF::IMAGE_SCN_CNT_CODE | 502 COFF::IMAGE_SCN_MEM_EXECUTE | 503 COFF::IMAGE_SCN_MEM_READ, 504 SectionKind::getText()); 505 DataSection = 506 Ctx->getCOFFSection(".data", 507 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 508 COFF::IMAGE_SCN_MEM_READ | 509 COFF::IMAGE_SCN_MEM_WRITE, 510 SectionKind::getDataRel()); 511 ReadOnlySection = 512 Ctx->getCOFFSection(".rdata", 513 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 514 COFF::IMAGE_SCN_MEM_READ, 515 SectionKind::getReadOnly()); 516 if (T.getOS() == Triple::Win32) { 517 StaticCtorSection = 518 Ctx->getCOFFSection(".CRT$XCU", 519 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 520 COFF::IMAGE_SCN_MEM_READ, 521 SectionKind::getReadOnly()); 522 } else { 523 StaticCtorSection = 524 Ctx->getCOFFSection(".ctors", 525 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 526 COFF::IMAGE_SCN_MEM_READ | 527 COFF::IMAGE_SCN_MEM_WRITE, 528 SectionKind::getDataRel()); 529 } 530 531 532 if (T.getOS() == Triple::Win32) { 533 StaticDtorSection = 534 Ctx->getCOFFSection(".CRT$XTX", 535 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 536 COFF::IMAGE_SCN_MEM_READ, 537 SectionKind::getReadOnly()); 538 } else { 539 StaticDtorSection = 540 Ctx->getCOFFSection(".dtors", 541 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 542 COFF::IMAGE_SCN_MEM_READ | 543 COFF::IMAGE_SCN_MEM_WRITE, 544 SectionKind::getDataRel()); 545 } 546 547 // FIXME: We're emitting LSDA info into a readonly section on COFF, even 548 // though it contains relocatable pointers. In PIC mode, this is probably a 549 // big runtime hit for C++ apps. Either the contents of the LSDA need to be 550 // adjusted or this should be a data section. 551 LSDASection = 552 Ctx->getCOFFSection(".gcc_except_table", 553 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 554 COFF::IMAGE_SCN_MEM_READ, 555 SectionKind::getReadOnly()); 556 557 // Debug info. 558 DwarfAbbrevSection = 559 Ctx->getCOFFSection(".debug_abbrev", 560 COFF::IMAGE_SCN_MEM_DISCARDABLE | 561 COFF::IMAGE_SCN_MEM_READ, 562 SectionKind::getMetadata()); 563 DwarfInfoSection = 564 Ctx->getCOFFSection(".debug_info", 565 COFF::IMAGE_SCN_MEM_DISCARDABLE | 566 COFF::IMAGE_SCN_MEM_READ, 567 SectionKind::getMetadata()); 568 DwarfLineSection = 569 Ctx->getCOFFSection(".debug_line", 570 COFF::IMAGE_SCN_MEM_DISCARDABLE | 571 COFF::IMAGE_SCN_MEM_READ, 572 SectionKind::getMetadata()); 573 DwarfFrameSection = 574 Ctx->getCOFFSection(".debug_frame", 575 COFF::IMAGE_SCN_MEM_DISCARDABLE | 576 COFF::IMAGE_SCN_MEM_READ, 577 SectionKind::getMetadata()); 578 DwarfPubNamesSection = 579 Ctx->getCOFFSection(".debug_pubnames", 580 COFF::IMAGE_SCN_MEM_DISCARDABLE | 581 COFF::IMAGE_SCN_MEM_READ, 582 SectionKind::getMetadata()); 583 DwarfPubTypesSection = 584 Ctx->getCOFFSection(".debug_pubtypes", 585 COFF::IMAGE_SCN_MEM_DISCARDABLE | 586 COFF::IMAGE_SCN_MEM_READ, 587 SectionKind::getMetadata()); 588 DwarfStrSection = 589 Ctx->getCOFFSection(".debug_str", 590 COFF::IMAGE_SCN_MEM_DISCARDABLE | 591 COFF::IMAGE_SCN_MEM_READ, 592 SectionKind::getMetadata()); 593 DwarfLocSection = 594 Ctx->getCOFFSection(".debug_loc", 595 COFF::IMAGE_SCN_MEM_DISCARDABLE | 596 COFF::IMAGE_SCN_MEM_READ, 597 SectionKind::getMetadata()); 598 DwarfARangesSection = 599 Ctx->getCOFFSection(".debug_aranges", 600 COFF::IMAGE_SCN_MEM_DISCARDABLE | 601 COFF::IMAGE_SCN_MEM_READ, 602 SectionKind::getMetadata()); 603 DwarfRangesSection = 604 Ctx->getCOFFSection(".debug_ranges", 605 COFF::IMAGE_SCN_MEM_DISCARDABLE | 606 COFF::IMAGE_SCN_MEM_READ, 607 SectionKind::getMetadata()); 608 DwarfMacroInfoSection = 609 Ctx->getCOFFSection(".debug_macinfo", 610 COFF::IMAGE_SCN_MEM_DISCARDABLE | 611 COFF::IMAGE_SCN_MEM_READ, 612 SectionKind::getMetadata()); 613 614 DrectveSection = 615 Ctx->getCOFFSection(".drectve", 616 COFF::IMAGE_SCN_LNK_INFO, 617 SectionKind::getMetadata()); 618 619 PDataSection = 620 Ctx->getCOFFSection(".pdata", 621 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 622 COFF::IMAGE_SCN_MEM_READ, 623 SectionKind::getDataRel()); 624 625 XDataSection = 626 Ctx->getCOFFSection(".xdata", 627 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 628 COFF::IMAGE_SCN_MEM_READ, 629 SectionKind::getDataRel()); 630 TLSDataSection = 631 Ctx->getCOFFSection(".tls$", 632 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 633 COFF::IMAGE_SCN_MEM_READ | 634 COFF::IMAGE_SCN_MEM_WRITE, 635 SectionKind::getDataRel()); 636 } 637 638 void MCObjectFileInfo::InitMCObjectFileInfo(StringRef TT, Reloc::Model relocm, 639 CodeModel::Model cm, 640 MCContext &ctx) { 641 RelocM = relocm; 642 CMModel = cm; 643 Ctx = &ctx; 644 645 // Common. 646 CommDirectiveSupportsAlignment = true; 647 SupportsWeakOmittedEHFrame = true; 648 IsFunctionEHFrameSymbolPrivate = true; 649 650 PersonalityEncoding = LSDAEncoding = FDEEncoding = FDECFIEncoding = 651 TTypeEncoding = dwarf::DW_EH_PE_absptr; 652 653 CompactUnwindDwarfEHFrameOnly = 0; 654 655 EHFrameSection = 0; // Created on demand. 656 CompactUnwindSection = 0; // Used only by selected targets. 657 DwarfAccelNamesSection = 0; // Used only by selected targets. 658 DwarfAccelObjCSection = 0; // Used only by selected targets. 659 DwarfAccelNamespaceSection = 0; // Used only by selected targets. 660 DwarfAccelTypesSection = 0; // Used only by selected targets. 661 662 Triple T(TT); 663 Triple::ArchType Arch = T.getArch(); 664 // FIXME: Checking for Arch here to filter out bogus triples such as 665 // cellspu-apple-darwin. Perhaps we should fix in Triple? 666 if ((Arch == Triple::x86 || Arch == Triple::x86_64 || 667 Arch == Triple::arm || Arch == Triple::thumb || 668 Arch == Triple::ppc || Arch == Triple::ppc64 || 669 Arch == Triple::UnknownArch) && 670 (T.isOSDarwin() || T.getEnvironment() == Triple::MachO)) { 671 Env = IsMachO; 672 InitMachOMCObjectFileInfo(T); 673 } else if ((Arch == Triple::x86 || Arch == Triple::x86_64) && 674 (T.getEnvironment() != Triple::ELF) && 675 (T.getOS() == Triple::MinGW32 || T.getOS() == Triple::Cygwin || 676 T.getOS() == Triple::Win32)) { 677 Env = IsCOFF; 678 InitCOFFMCObjectFileInfo(T); 679 } else { 680 Env = IsELF; 681 InitELFMCObjectFileInfo(T); 682 } 683 } 684 685 void MCObjectFileInfo::InitEHFrameSection() { 686 if (Env == IsMachO) 687 EHFrameSection = 688 Ctx->getMachOSection("__TEXT", "__eh_frame", 689 MCSectionMachO::S_COALESCED | 690 MCSectionMachO::S_ATTR_NO_TOC | 691 MCSectionMachO::S_ATTR_STRIP_STATIC_SYMS | 692 MCSectionMachO::S_ATTR_LIVE_SUPPORT, 693 SectionKind::getReadOnly()); 694 else if (Env == IsELF) 695 EHFrameSection = 696 Ctx->getELFSection(".eh_frame", EHSectionType, 697 EHSectionFlags, 698 SectionKind::getDataRel()); 699 else 700 EHFrameSection = 701 Ctx->getCOFFSection(".eh_frame", 702 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 703 COFF::IMAGE_SCN_MEM_READ | 704 COFF::IMAGE_SCN_MEM_WRITE, 705 SectionKind::getDataRel()); 706 } 707
