1 //===-- llvm/CodeGen/TargetLoweringObjectFileImpl.cpp - Object File Info --===// 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 // This file implements classes used to handle lowerings specific to common 11 // object file formats. 12 // 13 //===----------------------------------------------------------------------===// 14 15 #include "llvm/CodeGen/TargetLoweringObjectFileImpl.h" 16 #include "llvm/Constants.h" 17 #include "llvm/DerivedTypes.h" 18 #include "llvm/Function.h" 19 #include "llvm/GlobalVariable.h" 20 #include "llvm/CodeGen/MachineModuleInfoImpls.h" 21 #include "llvm/MC/MCContext.h" 22 #include "llvm/MC/MCExpr.h" 23 #include "llvm/MC/MCSectionMachO.h" 24 #include "llvm/MC/MCSectionELF.h" 25 #include "llvm/MC/MCSectionCOFF.h" 26 #include "llvm/MC/MCStreamer.h" 27 #include "llvm/MC/MCSymbol.h" 28 #include "llvm/Target/Mangler.h" 29 #include "llvm/Target/TargetData.h" 30 #include "llvm/Target/TargetMachine.h" 31 #include "llvm/Target/TargetOptions.h" 32 #include "llvm/Support/Dwarf.h" 33 #include "llvm/Support/ELF.h" 34 #include "llvm/Support/ErrorHandling.h" 35 #include "llvm/Support/raw_ostream.h" 36 #include "llvm/ADT/SmallString.h" 37 #include "llvm/ADT/StringExtras.h" 38 #include "llvm/ADT/Triple.h" 39 using namespace llvm; 40 using namespace dwarf; 41 42 //===----------------------------------------------------------------------===// 43 // ELF 44 //===----------------------------------------------------------------------===// 45 46 void TargetLoweringObjectFileELF::Initialize(MCContext &Ctx, 47 const TargetMachine &TM) { 48 TargetLoweringObjectFile::Initialize(Ctx, TM); 49 50 BSSSection = 51 getContext().getELFSection(".bss", ELF::SHT_NOBITS, 52 ELF::SHF_WRITE |ELF::SHF_ALLOC, 53 SectionKind::getBSS()); 54 55 TextSection = 56 getContext().getELFSection(".text", ELF::SHT_PROGBITS, 57 ELF::SHF_EXECINSTR | 58 ELF::SHF_ALLOC, 59 SectionKind::getText()); 60 61 DataSection = 62 getContext().getELFSection(".data", ELF::SHT_PROGBITS, 63 ELF::SHF_WRITE |ELF::SHF_ALLOC, 64 SectionKind::getDataRel()); 65 66 ReadOnlySection = 67 getContext().getELFSection(".rodata", ELF::SHT_PROGBITS, 68 ELF::SHF_ALLOC, 69 SectionKind::getReadOnly()); 70 71 TLSDataSection = 72 getContext().getELFSection(".tdata", ELF::SHT_PROGBITS, 73 ELF::SHF_ALLOC | ELF::SHF_TLS | 74 ELF::SHF_WRITE, 75 SectionKind::getThreadData()); 76 77 TLSBSSSection = 78 getContext().getELFSection(".tbss", ELF::SHT_NOBITS, 79 ELF::SHF_ALLOC | ELF::SHF_TLS | 80 ELF::SHF_WRITE, 81 SectionKind::getThreadBSS()); 82 83 DataRelSection = 84 getContext().getELFSection(".data.rel", ELF::SHT_PROGBITS, 85 ELF::SHF_ALLOC |ELF::SHF_WRITE, 86 SectionKind::getDataRel()); 87 88 DataRelLocalSection = 89 getContext().getELFSection(".data.rel.local", ELF::SHT_PROGBITS, 90 ELF::SHF_ALLOC |ELF::SHF_WRITE, 91 SectionKind::getDataRelLocal()); 92 93 DataRelROSection = 94 getContext().getELFSection(".data.rel.ro", ELF::SHT_PROGBITS, 95 ELF::SHF_ALLOC |ELF::SHF_WRITE, 96 SectionKind::getReadOnlyWithRel()); 97 98 DataRelROLocalSection = 99 getContext().getELFSection(".data.rel.ro.local", ELF::SHT_PROGBITS, 100 ELF::SHF_ALLOC |ELF::SHF_WRITE, 101 SectionKind::getReadOnlyWithRelLocal()); 102 103 MergeableConst4Section = 104 getContext().getELFSection(".rodata.cst4", ELF::SHT_PROGBITS, 105 ELF::SHF_ALLOC |ELF::SHF_MERGE, 106 SectionKind::getMergeableConst4()); 107 108 MergeableConst8Section = 109 getContext().getELFSection(".rodata.cst8", ELF::SHT_PROGBITS, 110 ELF::SHF_ALLOC |ELF::SHF_MERGE, 111 SectionKind::getMergeableConst8()); 112 113 MergeableConst16Section = 114 getContext().getELFSection(".rodata.cst16", ELF::SHT_PROGBITS, 115 ELF::SHF_ALLOC |ELF::SHF_MERGE, 116 SectionKind::getMergeableConst16()); 117 118 StaticCtorSection = 119 getContext().getELFSection(".ctors", ELF::SHT_PROGBITS, 120 ELF::SHF_ALLOC |ELF::SHF_WRITE, 121 SectionKind::getDataRel()); 122 123 StaticDtorSection = 124 getContext().getELFSection(".dtors", ELF::SHT_PROGBITS, 125 ELF::SHF_ALLOC |ELF::SHF_WRITE, 126 SectionKind::getDataRel()); 127 128 // Exception Handling Sections. 129 130 // FIXME: We're emitting LSDA info into a readonly section on ELF, even though 131 // it contains relocatable pointers. In PIC mode, this is probably a big 132 // runtime hit for C++ apps. Either the contents of the LSDA need to be 133 // adjusted or this should be a data section. 134 LSDASection = 135 getContext().getELFSection(".gcc_except_table", ELF::SHT_PROGBITS, 136 ELF::SHF_ALLOC, 137 SectionKind::getReadOnly()); 138 // Debug Info Sections. 139 DwarfAbbrevSection = 140 getContext().getELFSection(".debug_abbrev", ELF::SHT_PROGBITS, 0, 141 SectionKind::getMetadata()); 142 DwarfInfoSection = 143 getContext().getELFSection(".debug_info", ELF::SHT_PROGBITS, 0, 144 SectionKind::getMetadata()); 145 DwarfLineSection = 146 getContext().getELFSection(".debug_line", ELF::SHT_PROGBITS, 0, 147 SectionKind::getMetadata()); 148 DwarfFrameSection = 149 getContext().getELFSection(".debug_frame", ELF::SHT_PROGBITS, 0, 150 SectionKind::getMetadata()); 151 DwarfPubNamesSection = 152 getContext().getELFSection(".debug_pubnames", ELF::SHT_PROGBITS, 0, 153 SectionKind::getMetadata()); 154 DwarfPubTypesSection = 155 getContext().getELFSection(".debug_pubtypes", ELF::SHT_PROGBITS, 0, 156 SectionKind::getMetadata()); 157 DwarfStrSection = 158 getContext().getELFSection(".debug_str", ELF::SHT_PROGBITS, 0, 159 SectionKind::getMetadata()); 160 DwarfLocSection = 161 getContext().getELFSection(".debug_loc", ELF::SHT_PROGBITS, 0, 162 SectionKind::getMetadata()); 163 DwarfARangesSection = 164 getContext().getELFSection(".debug_aranges", ELF::SHT_PROGBITS, 0, 165 SectionKind::getMetadata()); 166 DwarfRangesSection = 167 getContext().getELFSection(".debug_ranges", ELF::SHT_PROGBITS, 0, 168 SectionKind::getMetadata()); 169 DwarfMacroInfoSection = 170 getContext().getELFSection(".debug_macinfo", ELF::SHT_PROGBITS, 0, 171 SectionKind::getMetadata()); 172 } 173 174 const MCSection *TargetLoweringObjectFileELF::getEHFrameSection() const { 175 return getContext().getELFSection(".eh_frame", ELF::SHT_PROGBITS, 176 ELF::SHF_ALLOC, 177 SectionKind::getDataRel()); 178 } 179 180 MCSymbol * 181 TargetLoweringObjectFileELF::getCFIPersonalitySymbol(const GlobalValue *GV, 182 Mangler *Mang, 183 MachineModuleInfo *MMI) const { 184 unsigned Encoding = getPersonalityEncoding(); 185 switch (Encoding & 0x70) { 186 default: 187 report_fatal_error("We do not support this DWARF encoding yet!"); 188 case dwarf::DW_EH_PE_absptr: 189 return Mang->getSymbol(GV); 190 break; 191 case dwarf::DW_EH_PE_pcrel: { 192 return getContext().GetOrCreateSymbol(StringRef("DW.ref.") + 193 Mang->getSymbol(GV)->getName()); 194 break; 195 } 196 } 197 } 198 199 void TargetLoweringObjectFileELF::emitPersonalityValue(MCStreamer &Streamer, 200 const TargetMachine &TM, 201 const MCSymbol *Sym) const { 202 SmallString<64> NameData("DW.ref."); 203 NameData += Sym->getName(); 204 MCSymbol *Label = getContext().GetOrCreateSymbol(NameData); 205 Streamer.EmitSymbolAttribute(Label, MCSA_Hidden); 206 Streamer.EmitSymbolAttribute(Label, MCSA_Weak); 207 StringRef Prefix = ".data."; 208 NameData.insert(NameData.begin(), Prefix.begin(), Prefix.end()); 209 unsigned Flags = ELF::SHF_ALLOC | ELF::SHF_WRITE | ELF::SHF_GROUP; 210 const MCSection *Sec = getContext().getELFSection(NameData, 211 ELF::SHT_PROGBITS, 212 Flags, 213 SectionKind::getDataRel(), 214 0, Label->getName()); 215 Streamer.SwitchSection(Sec); 216 Streamer.EmitValueToAlignment(8); 217 Streamer.EmitSymbolAttribute(Label, MCSA_ELF_TypeObject); 218 const MCExpr *E = MCConstantExpr::Create(8, getContext()); 219 Streamer.EmitELFSize(Label, E); 220 Streamer.EmitLabel(Label); 221 222 unsigned Size = TM.getTargetData()->getPointerSize(); 223 Streamer.EmitSymbolValue(Sym, Size); 224 } 225 226 static SectionKind 227 getELFKindForNamedSection(StringRef Name, SectionKind K) { 228 // N.B.: The defaults used in here are no the same ones used in MC. 229 // We follow gcc, MC follows gas. For example, given ".section .eh_frame", 230 // both gas and MC will produce a section with no flags. Given 231 // section(".eh_frame") gcc will produce 232 // .section .eh_frame,"a",@progbits 233 if (Name.empty() || Name[0] != '.') return K; 234 235 // Some lame default implementation based on some magic section names. 236 if (Name == ".bss" || 237 Name.startswith(".bss.") || 238 Name.startswith(".gnu.linkonce.b.") || 239 Name.startswith(".llvm.linkonce.b.") || 240 Name == ".sbss" || 241 Name.startswith(".sbss.") || 242 Name.startswith(".gnu.linkonce.sb.") || 243 Name.startswith(".llvm.linkonce.sb.")) 244 return SectionKind::getBSS(); 245 246 if (Name == ".tdata" || 247 Name.startswith(".tdata.") || 248 Name.startswith(".gnu.linkonce.td.") || 249 Name.startswith(".llvm.linkonce.td.")) 250 return SectionKind::getThreadData(); 251 252 if (Name == ".tbss" || 253 Name.startswith(".tbss.") || 254 Name.startswith(".gnu.linkonce.tb.") || 255 Name.startswith(".llvm.linkonce.tb.")) 256 return SectionKind::getThreadBSS(); 257 258 return K; 259 } 260 261 262 static unsigned getELFSectionType(StringRef Name, SectionKind K) { 263 264 if (Name == ".init_array") 265 return ELF::SHT_INIT_ARRAY; 266 267 if (Name == ".fini_array") 268 return ELF::SHT_FINI_ARRAY; 269 270 if (Name == ".preinit_array") 271 return ELF::SHT_PREINIT_ARRAY; 272 273 if (K.isBSS() || K.isThreadBSS()) 274 return ELF::SHT_NOBITS; 275 276 return ELF::SHT_PROGBITS; 277 } 278 279 280 static unsigned 281 getELFSectionFlags(SectionKind K) { 282 unsigned Flags = 0; 283 284 if (!K.isMetadata()) 285 Flags |= ELF::SHF_ALLOC; 286 287 if (K.isText()) 288 Flags |= ELF::SHF_EXECINSTR; 289 290 if (K.isWriteable()) 291 Flags |= ELF::SHF_WRITE; 292 293 if (K.isThreadLocal()) 294 Flags |= ELF::SHF_TLS; 295 296 // K.isMergeableConst() is left out to honour PR4650 297 if (K.isMergeableCString() || K.isMergeableConst4() || 298 K.isMergeableConst8() || K.isMergeableConst16()) 299 Flags |= ELF::SHF_MERGE; 300 301 if (K.isMergeableCString()) 302 Flags |= ELF::SHF_STRINGS; 303 304 return Flags; 305 } 306 307 308 const MCSection *TargetLoweringObjectFileELF:: 309 getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind, 310 Mangler *Mang, const TargetMachine &TM) const { 311 StringRef SectionName = GV->getSection(); 312 313 // Infer section flags from the section name if we can. 314 Kind = getELFKindForNamedSection(SectionName, Kind); 315 316 return getContext().getELFSection(SectionName, 317 getELFSectionType(SectionName, Kind), 318 getELFSectionFlags(Kind), Kind); 319 } 320 321 /// getSectionPrefixForGlobal - Return the section prefix name used by options 322 /// FunctionsSections and DataSections. 323 static const char *getSectionPrefixForGlobal(SectionKind Kind) { 324 if (Kind.isText()) return ".text."; 325 if (Kind.isReadOnly()) return ".rodata."; 326 327 if (Kind.isThreadData()) return ".tdata."; 328 if (Kind.isThreadBSS()) return ".tbss."; 329 330 if (Kind.isDataNoRel()) return ".data."; 331 if (Kind.isDataRelLocal()) return ".data.rel.local."; 332 if (Kind.isDataRel()) return ".data.rel."; 333 if (Kind.isReadOnlyWithRelLocal()) return ".data.rel.ro.local."; 334 335 assert(Kind.isReadOnlyWithRel() && "Unknown section kind"); 336 return ".data.rel.ro."; 337 } 338 339 340 const MCSection *TargetLoweringObjectFileELF:: 341 SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind, 342 Mangler *Mang, const TargetMachine &TM) const { 343 // If we have -ffunction-section or -fdata-section then we should emit the 344 // global value to a uniqued section specifically for it. 345 bool EmitUniquedSection; 346 if (Kind.isText()) 347 EmitUniquedSection = TM.getFunctionSections(); 348 else 349 EmitUniquedSection = TM.getDataSections(); 350 351 // If this global is linkonce/weak and the target handles this by emitting it 352 // into a 'uniqued' section name, create and return the section now. 353 if ((GV->isWeakForLinker() || EmitUniquedSection) && 354 !Kind.isCommon() && !Kind.isBSS()) { 355 const char *Prefix; 356 Prefix = getSectionPrefixForGlobal(Kind); 357 358 SmallString<128> Name(Prefix, Prefix+strlen(Prefix)); 359 MCSymbol *Sym = Mang->getSymbol(GV); 360 Name.append(Sym->getName().begin(), Sym->getName().end()); 361 StringRef Group = ""; 362 unsigned Flags = getELFSectionFlags(Kind); 363 if (GV->isWeakForLinker()) { 364 Group = Sym->getName(); 365 Flags |= ELF::SHF_GROUP; 366 } 367 368 return getContext().getELFSection(Name.str(), 369 getELFSectionType(Name.str(), Kind), 370 Flags, Kind, 0, Group); 371 } 372 373 if (Kind.isText()) return TextSection; 374 375 if (Kind.isMergeable1ByteCString() || 376 Kind.isMergeable2ByteCString() || 377 Kind.isMergeable4ByteCString()) { 378 379 // We also need alignment here. 380 // FIXME: this is getting the alignment of the character, not the 381 // alignment of the global! 382 unsigned Align = 383 TM.getTargetData()->getPreferredAlignment(cast<GlobalVariable>(GV)); 384 385 const char *SizeSpec = ".rodata.str1."; 386 if (Kind.isMergeable2ByteCString()) 387 SizeSpec = ".rodata.str2."; 388 else if (Kind.isMergeable4ByteCString()) 389 SizeSpec = ".rodata.str4."; 390 else 391 assert(Kind.isMergeable1ByteCString() && "unknown string width"); 392 393 394 std::string Name = SizeSpec + utostr(Align); 395 return getContext().getELFSection(Name, ELF::SHT_PROGBITS, 396 ELF::SHF_ALLOC | 397 ELF::SHF_MERGE | 398 ELF::SHF_STRINGS, 399 Kind); 400 } 401 402 if (Kind.isMergeableConst()) { 403 if (Kind.isMergeableConst4() && MergeableConst4Section) 404 return MergeableConst4Section; 405 if (Kind.isMergeableConst8() && MergeableConst8Section) 406 return MergeableConst8Section; 407 if (Kind.isMergeableConst16() && MergeableConst16Section) 408 return MergeableConst16Section; 409 return ReadOnlySection; // .const 410 } 411 412 if (Kind.isReadOnly()) return ReadOnlySection; 413 414 if (Kind.isThreadData()) return TLSDataSection; 415 if (Kind.isThreadBSS()) return TLSBSSSection; 416 417 // Note: we claim that common symbols are put in BSSSection, but they are 418 // really emitted with the magic .comm directive, which creates a symbol table 419 // entry but not a section. 420 if (Kind.isBSS() || Kind.isCommon()) return BSSSection; 421 422 if (Kind.isDataNoRel()) return DataSection; 423 if (Kind.isDataRelLocal()) return DataRelLocalSection; 424 if (Kind.isDataRel()) return DataRelSection; 425 if (Kind.isReadOnlyWithRelLocal()) return DataRelROLocalSection; 426 427 assert(Kind.isReadOnlyWithRel() && "Unknown section kind"); 428 return DataRelROSection; 429 } 430 431 /// getSectionForConstant - Given a mergeable constant with the 432 /// specified size and relocation information, return a section that it 433 /// should be placed in. 434 const MCSection *TargetLoweringObjectFileELF:: 435 getSectionForConstant(SectionKind Kind) const { 436 if (Kind.isMergeableConst4() && MergeableConst4Section) 437 return MergeableConst4Section; 438 if (Kind.isMergeableConst8() && MergeableConst8Section) 439 return MergeableConst8Section; 440 if (Kind.isMergeableConst16() && MergeableConst16Section) 441 return MergeableConst16Section; 442 if (Kind.isReadOnly()) 443 return ReadOnlySection; 444 445 if (Kind.isReadOnlyWithRelLocal()) return DataRelROLocalSection; 446 assert(Kind.isReadOnlyWithRel() && "Unknown section kind"); 447 return DataRelROSection; 448 } 449 450 const MCExpr *TargetLoweringObjectFileELF:: 451 getExprForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang, 452 MachineModuleInfo *MMI, 453 unsigned Encoding, MCStreamer &Streamer) const { 454 455 if (Encoding & dwarf::DW_EH_PE_indirect) { 456 MachineModuleInfoELF &ELFMMI = MMI->getObjFileInfo<MachineModuleInfoELF>(); 457 458 SmallString<128> Name; 459 Mang->getNameWithPrefix(Name, GV, true); 460 Name += ".DW.stub"; 461 462 // Add information about the stub reference to ELFMMI so that the stub 463 // gets emitted by the asmprinter. 464 MCSymbol *SSym = getContext().GetOrCreateSymbol(Name.str()); 465 MachineModuleInfoImpl::StubValueTy &StubSym = ELFMMI.getGVStubEntry(SSym); 466 if (StubSym.getPointer() == 0) { 467 MCSymbol *Sym = Mang->getSymbol(GV); 468 StubSym = MachineModuleInfoImpl::StubValueTy(Sym, !GV->hasLocalLinkage()); 469 } 470 471 return TargetLoweringObjectFile:: 472 getExprForDwarfReference(SSym, Encoding & ~dwarf::DW_EH_PE_indirect, Streamer); 473 } 474 475 return TargetLoweringObjectFile:: 476 getExprForDwarfGlobalReference(GV, Mang, MMI, Encoding, Streamer); 477 } 478 479 //===----------------------------------------------------------------------===// 480 // MachO 481 //===----------------------------------------------------------------------===// 482 483 void TargetLoweringObjectFileMachO::Initialize(MCContext &Ctx, 484 const TargetMachine &TM) { 485 IsFunctionEHFrameSymbolPrivate = false; 486 SupportsWeakOmittedEHFrame = false; 487 488 // .comm doesn't support alignment before Leopard. 489 Triple T(((LLVMTargetMachine&)TM).getTargetTriple()); 490 if (T.isMacOSX()) { 491 if (T.isMacOSXVersionLT(10, 5)) 492 CommDirectiveSupportsAlignment = false; 493 if (!T.isMacOSXVersionLT(10, 6)) 494 SupportsCompactUnwindInfo = true; 495 } 496 497 TargetLoweringObjectFile::Initialize(Ctx, TM); 498 499 TextSection // .text 500 = getContext().getMachOSection("__TEXT", "__text", 501 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS, 502 SectionKind::getText()); 503 DataSection // .data 504 = getContext().getMachOSection("__DATA", "__data", 0, 505 SectionKind::getDataRel()); 506 507 TLSDataSection // .tdata 508 = getContext().getMachOSection("__DATA", "__thread_data", 509 MCSectionMachO::S_THREAD_LOCAL_REGULAR, 510 SectionKind::getDataRel()); 511 TLSBSSSection // .tbss 512 = getContext().getMachOSection("__DATA", "__thread_bss", 513 MCSectionMachO::S_THREAD_LOCAL_ZEROFILL, 514 SectionKind::getThreadBSS()); 515 516 // TODO: Verify datarel below. 517 TLSTLVSection // .tlv 518 = getContext().getMachOSection("__DATA", "__thread_vars", 519 MCSectionMachO::S_THREAD_LOCAL_VARIABLES, 520 SectionKind::getDataRel()); 521 522 TLSThreadInitSection 523 = getContext().getMachOSection("__DATA", "__thread_init", 524 MCSectionMachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS, 525 SectionKind::getDataRel()); 526 527 CStringSection // .cstring 528 = getContext().getMachOSection("__TEXT", "__cstring", 529 MCSectionMachO::S_CSTRING_LITERALS, 530 SectionKind::getMergeable1ByteCString()); 531 UStringSection 532 = getContext().getMachOSection("__TEXT","__ustring", 0, 533 SectionKind::getMergeable2ByteCString()); 534 FourByteConstantSection // .literal4 535 = getContext().getMachOSection("__TEXT", "__literal4", 536 MCSectionMachO::S_4BYTE_LITERALS, 537 SectionKind::getMergeableConst4()); 538 EightByteConstantSection // .literal8 539 = getContext().getMachOSection("__TEXT", "__literal8", 540 MCSectionMachO::S_8BYTE_LITERALS, 541 SectionKind::getMergeableConst8()); 542 543 // ld_classic doesn't support .literal16 in 32-bit mode, and ld64 falls back 544 // to using it in -static mode. 545 SixteenByteConstantSection = 0; 546 if (TM.getRelocationModel() != Reloc::Static && 547 TM.getTargetData()->getPointerSize() == 32) 548 SixteenByteConstantSection = // .literal16 549 getContext().getMachOSection("__TEXT", "__literal16", 550 MCSectionMachO::S_16BYTE_LITERALS, 551 SectionKind::getMergeableConst16()); 552 553 ReadOnlySection // .const 554 = getContext().getMachOSection("__TEXT", "__const", 0, 555 SectionKind::getReadOnly()); 556 557 TextCoalSection 558 = getContext().getMachOSection("__TEXT", "__textcoal_nt", 559 MCSectionMachO::S_COALESCED | 560 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS, 561 SectionKind::getText()); 562 ConstTextCoalSection 563 = getContext().getMachOSection("__TEXT", "__const_coal", 564 MCSectionMachO::S_COALESCED, 565 SectionKind::getReadOnly()); 566 ConstDataSection // .const_data 567 = getContext().getMachOSection("__DATA", "__const", 0, 568 SectionKind::getReadOnlyWithRel()); 569 DataCoalSection 570 = getContext().getMachOSection("__DATA","__datacoal_nt", 571 MCSectionMachO::S_COALESCED, 572 SectionKind::getDataRel()); 573 DataCommonSection 574 = getContext().getMachOSection("__DATA","__common", 575 MCSectionMachO::S_ZEROFILL, 576 SectionKind::getBSS()); 577 DataBSSSection 578 = getContext().getMachOSection("__DATA","__bss", MCSectionMachO::S_ZEROFILL, 579 SectionKind::getBSS()); 580 581 582 LazySymbolPointerSection 583 = getContext().getMachOSection("__DATA", "__la_symbol_ptr", 584 MCSectionMachO::S_LAZY_SYMBOL_POINTERS, 585 SectionKind::getMetadata()); 586 NonLazySymbolPointerSection 587 = getContext().getMachOSection("__DATA", "__nl_symbol_ptr", 588 MCSectionMachO::S_NON_LAZY_SYMBOL_POINTERS, 589 SectionKind::getMetadata()); 590 591 if (TM.getRelocationModel() == Reloc::Static) { 592 StaticCtorSection 593 = getContext().getMachOSection("__TEXT", "__constructor", 0, 594 SectionKind::getDataRel()); 595 StaticDtorSection 596 = getContext().getMachOSection("__TEXT", "__destructor", 0, 597 SectionKind::getDataRel()); 598 } else { 599 StaticCtorSection 600 = getContext().getMachOSection("__DATA", "__mod_init_func", 601 MCSectionMachO::S_MOD_INIT_FUNC_POINTERS, 602 SectionKind::getDataRel()); 603 StaticDtorSection 604 = getContext().getMachOSection("__DATA", "__mod_term_func", 605 MCSectionMachO::S_MOD_TERM_FUNC_POINTERS, 606 SectionKind::getDataRel()); 607 } 608 609 // Exception Handling. 610 LSDASection = getContext().getMachOSection("__TEXT", "__gcc_except_tab", 0, 611 SectionKind::getReadOnlyWithRel()); 612 613 CompactUnwindSection = 614 getContext().getMachOSection("__LD", "__compact_unwind", 615 MCSectionMachO::S_ATTR_DEBUG, 616 SectionKind::getReadOnly()); 617 618 // Debug Information. 619 DwarfAbbrevSection = 620 getContext().getMachOSection("__DWARF", "__debug_abbrev", 621 MCSectionMachO::S_ATTR_DEBUG, 622 SectionKind::getMetadata()); 623 DwarfInfoSection = 624 getContext().getMachOSection("__DWARF", "__debug_info", 625 MCSectionMachO::S_ATTR_DEBUG, 626 SectionKind::getMetadata()); 627 DwarfLineSection = 628 getContext().getMachOSection("__DWARF", "__debug_line", 629 MCSectionMachO::S_ATTR_DEBUG, 630 SectionKind::getMetadata()); 631 DwarfFrameSection = 632 getContext().getMachOSection("__DWARF", "__debug_frame", 633 MCSectionMachO::S_ATTR_DEBUG, 634 SectionKind::getMetadata()); 635 DwarfPubNamesSection = 636 getContext().getMachOSection("__DWARF", "__debug_pubnames", 637 MCSectionMachO::S_ATTR_DEBUG, 638 SectionKind::getMetadata()); 639 DwarfPubTypesSection = 640 getContext().getMachOSection("__DWARF", "__debug_pubtypes", 641 MCSectionMachO::S_ATTR_DEBUG, 642 SectionKind::getMetadata()); 643 DwarfStrSection = 644 getContext().getMachOSection("__DWARF", "__debug_str", 645 MCSectionMachO::S_ATTR_DEBUG, 646 SectionKind::getMetadata()); 647 DwarfLocSection = 648 getContext().getMachOSection("__DWARF", "__debug_loc", 649 MCSectionMachO::S_ATTR_DEBUG, 650 SectionKind::getMetadata()); 651 DwarfARangesSection = 652 getContext().getMachOSection("__DWARF", "__debug_aranges", 653 MCSectionMachO::S_ATTR_DEBUG, 654 SectionKind::getMetadata()); 655 DwarfRangesSection = 656 getContext().getMachOSection("__DWARF", "__debug_ranges", 657 MCSectionMachO::S_ATTR_DEBUG, 658 SectionKind::getMetadata()); 659 DwarfMacroInfoSection = 660 getContext().getMachOSection("__DWARF", "__debug_macinfo", 661 MCSectionMachO::S_ATTR_DEBUG, 662 SectionKind::getMetadata()); 663 DwarfDebugInlineSection = 664 getContext().getMachOSection("__DWARF", "__debug_inlined", 665 MCSectionMachO::S_ATTR_DEBUG, 666 SectionKind::getMetadata()); 667 668 TLSExtraDataSection = TLSTLVSection; 669 } 670 671 const MCSection *TargetLoweringObjectFileMachO::getEHFrameSection() const { 672 return getContext().getMachOSection("__TEXT", "__eh_frame", 673 MCSectionMachO::S_COALESCED | 674 MCSectionMachO::S_ATTR_NO_TOC | 675 MCSectionMachO::S_ATTR_STRIP_STATIC_SYMS | 676 MCSectionMachO::S_ATTR_LIVE_SUPPORT, 677 SectionKind::getReadOnly()); 678 } 679 680 const MCSection *TargetLoweringObjectFileMachO:: 681 getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind, 682 Mangler *Mang, const TargetMachine &TM) const { 683 // Parse the section specifier and create it if valid. 684 StringRef Segment, Section; 685 unsigned TAA = 0, StubSize = 0; 686 bool TAAParsed; 687 std::string ErrorCode = 688 MCSectionMachO::ParseSectionSpecifier(GV->getSection(), Segment, Section, 689 TAA, TAAParsed, StubSize); 690 if (!ErrorCode.empty()) { 691 // If invalid, report the error with report_fatal_error. 692 report_fatal_error("Global variable '" + GV->getNameStr() + 693 "' has an invalid section specifier '" + GV->getSection()+ 694 "': " + ErrorCode + "."); 695 // Fall back to dropping it into the data section. 696 return DataSection; 697 } 698 699 // Get the section. 700 const MCSectionMachO *S = 701 getContext().getMachOSection(Segment, Section, TAA, StubSize, Kind); 702 703 // If TAA wasn't set by ParseSectionSpecifier() above, 704 // use the value returned by getMachOSection() as a default. 705 if (!TAAParsed) 706 TAA = S->getTypeAndAttributes(); 707 708 // Okay, now that we got the section, verify that the TAA & StubSize agree. 709 // If the user declared multiple globals with different section flags, we need 710 // to reject it here. 711 if (S->getTypeAndAttributes() != TAA || S->getStubSize() != StubSize) { 712 // If invalid, report the error with report_fatal_error. 713 report_fatal_error("Global variable '" + GV->getNameStr() + 714 "' section type or attributes does not match previous" 715 " section specifier"); 716 } 717 718 return S; 719 } 720 721 const MCSection *TargetLoweringObjectFileMachO:: 722 SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind, 723 Mangler *Mang, const TargetMachine &TM) const { 724 725 // Handle thread local data. 726 if (Kind.isThreadBSS()) return TLSBSSSection; 727 if (Kind.isThreadData()) return TLSDataSection; 728 729 if (Kind.isText()) 730 return GV->isWeakForLinker() ? TextCoalSection : TextSection; 731 732 // If this is weak/linkonce, put this in a coalescable section, either in text 733 // or data depending on if it is writable. 734 if (GV->isWeakForLinker()) { 735 if (Kind.isReadOnly()) 736 return ConstTextCoalSection; 737 return DataCoalSection; 738 } 739 740 // FIXME: Alignment check should be handled by section classifier. 741 if (Kind.isMergeable1ByteCString() && 742 TM.getTargetData()->getPreferredAlignment(cast<GlobalVariable>(GV)) < 32) 743 return CStringSection; 744 745 // Do not put 16-bit arrays in the UString section if they have an 746 // externally visible label, this runs into issues with certain linker 747 // versions. 748 if (Kind.isMergeable2ByteCString() && !GV->hasExternalLinkage() && 749 TM.getTargetData()->getPreferredAlignment(cast<GlobalVariable>(GV)) < 32) 750 return UStringSection; 751 752 if (Kind.isMergeableConst()) { 753 if (Kind.isMergeableConst4()) 754 return FourByteConstantSection; 755 if (Kind.isMergeableConst8()) 756 return EightByteConstantSection; 757 if (Kind.isMergeableConst16() && SixteenByteConstantSection) 758 return SixteenByteConstantSection; 759 } 760 761 // Otherwise, if it is readonly, but not something we can specially optimize, 762 // just drop it in .const. 763 if (Kind.isReadOnly()) 764 return ReadOnlySection; 765 766 // If this is marked const, put it into a const section. But if the dynamic 767 // linker needs to write to it, put it in the data segment. 768 if (Kind.isReadOnlyWithRel()) 769 return ConstDataSection; 770 771 // Put zero initialized globals with strong external linkage in the 772 // DATA, __common section with the .zerofill directive. 773 if (Kind.isBSSExtern()) 774 return DataCommonSection; 775 776 // Put zero initialized globals with local linkage in __DATA,__bss directive 777 // with the .zerofill directive (aka .lcomm). 778 if (Kind.isBSSLocal()) 779 return DataBSSSection; 780 781 // Otherwise, just drop the variable in the normal data section. 782 return DataSection; 783 } 784 785 const MCSection * 786 TargetLoweringObjectFileMachO::getSectionForConstant(SectionKind Kind) const { 787 // If this constant requires a relocation, we have to put it in the data 788 // segment, not in the text segment. 789 if (Kind.isDataRel() || Kind.isReadOnlyWithRel()) 790 return ConstDataSection; 791 792 if (Kind.isMergeableConst4()) 793 return FourByteConstantSection; 794 if (Kind.isMergeableConst8()) 795 return EightByteConstantSection; 796 if (Kind.isMergeableConst16() && SixteenByteConstantSection) 797 return SixteenByteConstantSection; 798 return ReadOnlySection; // .const 799 } 800 801 /// shouldEmitUsedDirectiveFor - This hook allows targets to selectively decide 802 /// not to emit the UsedDirective for some symbols in llvm.used. 803 // FIXME: REMOVE this (rdar://7071300) 804 bool TargetLoweringObjectFileMachO:: 805 shouldEmitUsedDirectiveFor(const GlobalValue *GV, Mangler *Mang) const { 806 /// On Darwin, internally linked data beginning with "L" or "l" does not have 807 /// the directive emitted (this occurs in ObjC metadata). 808 if (!GV) return false; 809 810 // Check whether the mangled name has the "Private" or "LinkerPrivate" prefix. 811 if (GV->hasLocalLinkage() && !isa<Function>(GV)) { 812 // FIXME: ObjC metadata is currently emitted as internal symbols that have 813 // \1L and \0l prefixes on them. Fix them to be Private/LinkerPrivate and 814 // this horrible hack can go away. 815 MCSymbol *Sym = Mang->getSymbol(GV); 816 if (Sym->getName()[0] == 'L' || Sym->getName()[0] == 'l') 817 return false; 818 } 819 820 return true; 821 } 822 823 const MCExpr *TargetLoweringObjectFileMachO:: 824 getExprForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang, 825 MachineModuleInfo *MMI, unsigned Encoding, 826 MCStreamer &Streamer) const { 827 // The mach-o version of this method defaults to returning a stub reference. 828 829 if (Encoding & DW_EH_PE_indirect) { 830 MachineModuleInfoMachO &MachOMMI = 831 MMI->getObjFileInfo<MachineModuleInfoMachO>(); 832 833 SmallString<128> Name; 834 Mang->getNameWithPrefix(Name, GV, true); 835 Name += "$non_lazy_ptr"; 836 837 // Add information about the stub reference to MachOMMI so that the stub 838 // gets emitted by the asmprinter. 839 MCSymbol *SSym = getContext().GetOrCreateSymbol(Name.str()); 840 MachineModuleInfoImpl::StubValueTy &StubSym = MachOMMI.getGVStubEntry(SSym); 841 if (StubSym.getPointer() == 0) { 842 MCSymbol *Sym = Mang->getSymbol(GV); 843 StubSym = MachineModuleInfoImpl::StubValueTy(Sym, !GV->hasLocalLinkage()); 844 } 845 846 return TargetLoweringObjectFile:: 847 getExprForDwarfReference(SSym, Encoding & ~dwarf::DW_EH_PE_indirect, Streamer); 848 } 849 850 return TargetLoweringObjectFile:: 851 getExprForDwarfGlobalReference(GV, Mang, MMI, Encoding, Streamer); 852 } 853 854 MCSymbol *TargetLoweringObjectFileMachO:: 855 getCFIPersonalitySymbol(const GlobalValue *GV, Mangler *Mang, 856 MachineModuleInfo *MMI) const { 857 // The mach-o version of this method defaults to returning a stub reference. 858 MachineModuleInfoMachO &MachOMMI = 859 MMI->getObjFileInfo<MachineModuleInfoMachO>(); 860 861 SmallString<128> Name; 862 Mang->getNameWithPrefix(Name, GV, true); 863 Name += "$non_lazy_ptr"; 864 865 // Add information about the stub reference to MachOMMI so that the stub 866 // gets emitted by the asmprinter. 867 MCSymbol *SSym = getContext().GetOrCreateSymbol(Name.str()); 868 MachineModuleInfoImpl::StubValueTy &StubSym = MachOMMI.getGVStubEntry(SSym); 869 if (StubSym.getPointer() == 0) { 870 MCSymbol *Sym = Mang->getSymbol(GV); 871 StubSym = MachineModuleInfoImpl::StubValueTy(Sym, !GV->hasLocalLinkage()); 872 } 873 874 return SSym; 875 } 876 877 unsigned TargetLoweringObjectFileMachO::getPersonalityEncoding() const { 878 return DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4; 879 } 880 881 unsigned TargetLoweringObjectFileMachO::getLSDAEncoding() const { 882 return DW_EH_PE_pcrel; 883 } 884 885 unsigned TargetLoweringObjectFileMachO::getFDEEncoding(bool CFI) const { 886 return DW_EH_PE_pcrel; 887 } 888 889 unsigned TargetLoweringObjectFileMachO::getTTypeEncoding() const { 890 return DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4; 891 } 892 893 //===----------------------------------------------------------------------===// 894 // COFF 895 //===----------------------------------------------------------------------===// 896 897 void TargetLoweringObjectFileCOFF::Initialize(MCContext &Ctx, 898 const TargetMachine &TM) { 899 TargetLoweringObjectFile::Initialize(Ctx, TM); 900 TextSection = 901 getContext().getCOFFSection(".text", 902 COFF::IMAGE_SCN_CNT_CODE | 903 COFF::IMAGE_SCN_MEM_EXECUTE | 904 COFF::IMAGE_SCN_MEM_READ, 905 SectionKind::getText()); 906 DataSection = 907 getContext().getCOFFSection(".data", 908 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 909 COFF::IMAGE_SCN_MEM_READ | 910 COFF::IMAGE_SCN_MEM_WRITE, 911 SectionKind::getDataRel()); 912 ReadOnlySection = 913 getContext().getCOFFSection(".rdata", 914 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 915 COFF::IMAGE_SCN_MEM_READ, 916 SectionKind::getReadOnly()); 917 StaticCtorSection = 918 getContext().getCOFFSection(".ctors", 919 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 920 COFF::IMAGE_SCN_MEM_READ | 921 COFF::IMAGE_SCN_MEM_WRITE, 922 SectionKind::getDataRel()); 923 StaticDtorSection = 924 getContext().getCOFFSection(".dtors", 925 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 926 COFF::IMAGE_SCN_MEM_READ | 927 COFF::IMAGE_SCN_MEM_WRITE, 928 SectionKind::getDataRel()); 929 930 // FIXME: We're emitting LSDA info into a readonly section on COFF, even 931 // though it contains relocatable pointers. In PIC mode, this is probably a 932 // big runtime hit for C++ apps. Either the contents of the LSDA need to be 933 // adjusted or this should be a data section. 934 LSDASection = 935 getContext().getCOFFSection(".gcc_except_table", 936 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 937 COFF::IMAGE_SCN_MEM_READ, 938 SectionKind::getReadOnly()); 939 // Debug info. 940 DwarfAbbrevSection = 941 getContext().getCOFFSection(".debug_abbrev", 942 COFF::IMAGE_SCN_MEM_DISCARDABLE | 943 COFF::IMAGE_SCN_MEM_READ, 944 SectionKind::getMetadata()); 945 DwarfInfoSection = 946 getContext().getCOFFSection(".debug_info", 947 COFF::IMAGE_SCN_MEM_DISCARDABLE | 948 COFF::IMAGE_SCN_MEM_READ, 949 SectionKind::getMetadata()); 950 DwarfLineSection = 951 getContext().getCOFFSection(".debug_line", 952 COFF::IMAGE_SCN_MEM_DISCARDABLE | 953 COFF::IMAGE_SCN_MEM_READ, 954 SectionKind::getMetadata()); 955 DwarfFrameSection = 956 getContext().getCOFFSection(".debug_frame", 957 COFF::IMAGE_SCN_MEM_DISCARDABLE | 958 COFF::IMAGE_SCN_MEM_READ, 959 SectionKind::getMetadata()); 960 DwarfPubNamesSection = 961 getContext().getCOFFSection(".debug_pubnames", 962 COFF::IMAGE_SCN_MEM_DISCARDABLE | 963 COFF::IMAGE_SCN_MEM_READ, 964 SectionKind::getMetadata()); 965 DwarfPubTypesSection = 966 getContext().getCOFFSection(".debug_pubtypes", 967 COFF::IMAGE_SCN_MEM_DISCARDABLE | 968 COFF::IMAGE_SCN_MEM_READ, 969 SectionKind::getMetadata()); 970 DwarfStrSection = 971 getContext().getCOFFSection(".debug_str", 972 COFF::IMAGE_SCN_MEM_DISCARDABLE | 973 COFF::IMAGE_SCN_MEM_READ, 974 SectionKind::getMetadata()); 975 DwarfLocSection = 976 getContext().getCOFFSection(".debug_loc", 977 COFF::IMAGE_SCN_MEM_DISCARDABLE | 978 COFF::IMAGE_SCN_MEM_READ, 979 SectionKind::getMetadata()); 980 DwarfARangesSection = 981 getContext().getCOFFSection(".debug_aranges", 982 COFF::IMAGE_SCN_MEM_DISCARDABLE | 983 COFF::IMAGE_SCN_MEM_READ, 984 SectionKind::getMetadata()); 985 DwarfRangesSection = 986 getContext().getCOFFSection(".debug_ranges", 987 COFF::IMAGE_SCN_MEM_DISCARDABLE | 988 COFF::IMAGE_SCN_MEM_READ, 989 SectionKind::getMetadata()); 990 DwarfMacroInfoSection = 991 getContext().getCOFFSection(".debug_macinfo", 992 COFF::IMAGE_SCN_MEM_DISCARDABLE | 993 COFF::IMAGE_SCN_MEM_READ, 994 SectionKind::getMetadata()); 995 996 DrectveSection = 997 getContext().getCOFFSection(".drectve", 998 COFF::IMAGE_SCN_LNK_INFO, 999 SectionKind::getMetadata()); 1000 1001 PDataSection = 1002 getContext().getCOFFSection(".pdata", 1003 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 1004 COFF::IMAGE_SCN_MEM_READ | 1005 COFF::IMAGE_SCN_MEM_WRITE, 1006 SectionKind::getDataRel()); 1007 1008 XDataSection = 1009 getContext().getCOFFSection(".xdata", 1010 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 1011 COFF::IMAGE_SCN_MEM_READ | 1012 COFF::IMAGE_SCN_MEM_WRITE, 1013 SectionKind::getDataRel()); 1014 } 1015 1016 const MCSection *TargetLoweringObjectFileCOFF::getEHFrameSection() const { 1017 return getContext().getCOFFSection(".eh_frame", 1018 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 1019 COFF::IMAGE_SCN_MEM_READ | 1020 COFF::IMAGE_SCN_MEM_WRITE, 1021 SectionKind::getDataRel()); 1022 } 1023 1024 const MCSection *TargetLoweringObjectFileCOFF::getWin64EHFuncTableSection( 1025 StringRef suffix) const { 1026 if (suffix == "") 1027 return PDataSection; 1028 return getContext().getCOFFSection((".pdata"+suffix).str(), 1029 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 1030 COFF::IMAGE_SCN_MEM_READ | 1031 COFF::IMAGE_SCN_MEM_WRITE, 1032 SectionKind::getDataRel()); 1033 } 1034 1035 const MCSection *TargetLoweringObjectFileCOFF::getWin64EHTableSection( 1036 StringRef suffix) const { 1037 if (suffix == "") 1038 return XDataSection; 1039 return getContext().getCOFFSection((".xdata"+suffix).str(), 1040 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 1041 COFF::IMAGE_SCN_MEM_READ | 1042 COFF::IMAGE_SCN_MEM_WRITE, 1043 SectionKind::getDataRel()); 1044 } 1045 1046 1047 static unsigned 1048 getCOFFSectionFlags(SectionKind K) { 1049 unsigned Flags = 0; 1050 1051 if (K.isMetadata()) 1052 Flags |= 1053 COFF::IMAGE_SCN_MEM_DISCARDABLE; 1054 else if (K.isText()) 1055 Flags |= 1056 COFF::IMAGE_SCN_MEM_EXECUTE | 1057 COFF::IMAGE_SCN_MEM_READ | 1058 COFF::IMAGE_SCN_CNT_CODE; 1059 else if (K.isBSS ()) 1060 Flags |= 1061 COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA | 1062 COFF::IMAGE_SCN_MEM_READ | 1063 COFF::IMAGE_SCN_MEM_WRITE; 1064 else if (K.isReadOnly()) 1065 Flags |= 1066 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 1067 COFF::IMAGE_SCN_MEM_READ; 1068 else if (K.isWriteable()) 1069 Flags |= 1070 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 1071 COFF::IMAGE_SCN_MEM_READ | 1072 COFF::IMAGE_SCN_MEM_WRITE; 1073 1074 return Flags; 1075 } 1076 1077 const MCSection *TargetLoweringObjectFileCOFF:: 1078 getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind, 1079 Mangler *Mang, const TargetMachine &TM) const { 1080 return getContext().getCOFFSection(GV->getSection(), 1081 getCOFFSectionFlags(Kind), 1082 Kind); 1083 } 1084 1085 static const char *getCOFFSectionPrefixForUniqueGlobal(SectionKind Kind) { 1086 if (Kind.isText()) 1087 return ".text$"; 1088 if (Kind.isBSS ()) 1089 return ".bss$"; 1090 if (Kind.isWriteable()) 1091 return ".data$"; 1092 return ".rdata$"; 1093 } 1094 1095 1096 const MCSection *TargetLoweringObjectFileCOFF:: 1097 SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind, 1098 Mangler *Mang, const TargetMachine &TM) const { 1099 assert(!Kind.isThreadLocal() && "Doesn't support TLS"); 1100 1101 // If this global is linkonce/weak and the target handles this by emitting it 1102 // into a 'uniqued' section name, create and return the section now. 1103 if (GV->isWeakForLinker()) { 1104 const char *Prefix = getCOFFSectionPrefixForUniqueGlobal(Kind); 1105 SmallString<128> Name(Prefix, Prefix+strlen(Prefix)); 1106 MCSymbol *Sym = Mang->getSymbol(GV); 1107 Name.append(Sym->getName().begin() + 1, Sym->getName().end()); 1108 1109 unsigned Characteristics = getCOFFSectionFlags(Kind); 1110 1111 Characteristics |= COFF::IMAGE_SCN_LNK_COMDAT; 1112 1113 return getContext().getCOFFSection(Name.str(), Characteristics, 1114 COFF::IMAGE_COMDAT_SELECT_ANY, Kind); 1115 } 1116 1117 if (Kind.isText()) 1118 return getTextSection(); 1119 1120 return getDataSection(); 1121 } 1122 1123