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() && T.isMacOSXVersionLT(10, 5)) 491 CommDirectiveSupportsAlignment = false; 492 493 TargetLoweringObjectFile::Initialize(Ctx, TM); 494 495 TextSection // .text 496 = getContext().getMachOSection("__TEXT", "__text", 497 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS, 498 SectionKind::getText()); 499 DataSection // .data 500 = getContext().getMachOSection("__DATA", "__data", 0, 501 SectionKind::getDataRel()); 502 503 TLSDataSection // .tdata 504 = getContext().getMachOSection("__DATA", "__thread_data", 505 MCSectionMachO::S_THREAD_LOCAL_REGULAR, 506 SectionKind::getDataRel()); 507 TLSBSSSection // .tbss 508 = getContext().getMachOSection("__DATA", "__thread_bss", 509 MCSectionMachO::S_THREAD_LOCAL_ZEROFILL, 510 SectionKind::getThreadBSS()); 511 512 // TODO: Verify datarel below. 513 TLSTLVSection // .tlv 514 = getContext().getMachOSection("__DATA", "__thread_vars", 515 MCSectionMachO::S_THREAD_LOCAL_VARIABLES, 516 SectionKind::getDataRel()); 517 518 TLSThreadInitSection 519 = getContext().getMachOSection("__DATA", "__thread_init", 520 MCSectionMachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS, 521 SectionKind::getDataRel()); 522 523 CStringSection // .cstring 524 = getContext().getMachOSection("__TEXT", "__cstring", 525 MCSectionMachO::S_CSTRING_LITERALS, 526 SectionKind::getMergeable1ByteCString()); 527 UStringSection 528 = getContext().getMachOSection("__TEXT","__ustring", 0, 529 SectionKind::getMergeable2ByteCString()); 530 FourByteConstantSection // .literal4 531 = getContext().getMachOSection("__TEXT", "__literal4", 532 MCSectionMachO::S_4BYTE_LITERALS, 533 SectionKind::getMergeableConst4()); 534 EightByteConstantSection // .literal8 535 = getContext().getMachOSection("__TEXT", "__literal8", 536 MCSectionMachO::S_8BYTE_LITERALS, 537 SectionKind::getMergeableConst8()); 538 539 // ld_classic doesn't support .literal16 in 32-bit mode, and ld64 falls back 540 // to using it in -static mode. 541 SixteenByteConstantSection = 0; 542 if (TM.getRelocationModel() != Reloc::Static && 543 TM.getTargetData()->getPointerSize() == 32) 544 SixteenByteConstantSection = // .literal16 545 getContext().getMachOSection("__TEXT", "__literal16", 546 MCSectionMachO::S_16BYTE_LITERALS, 547 SectionKind::getMergeableConst16()); 548 549 ReadOnlySection // .const 550 = getContext().getMachOSection("__TEXT", "__const", 0, 551 SectionKind::getReadOnly()); 552 553 TextCoalSection 554 = getContext().getMachOSection("__TEXT", "__textcoal_nt", 555 MCSectionMachO::S_COALESCED | 556 MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS, 557 SectionKind::getText()); 558 ConstTextCoalSection 559 = getContext().getMachOSection("__TEXT", "__const_coal", 560 MCSectionMachO::S_COALESCED, 561 SectionKind::getReadOnly()); 562 ConstDataSection // .const_data 563 = getContext().getMachOSection("__DATA", "__const", 0, 564 SectionKind::getReadOnlyWithRel()); 565 DataCoalSection 566 = getContext().getMachOSection("__DATA","__datacoal_nt", 567 MCSectionMachO::S_COALESCED, 568 SectionKind::getDataRel()); 569 DataCommonSection 570 = getContext().getMachOSection("__DATA","__common", 571 MCSectionMachO::S_ZEROFILL, 572 SectionKind::getBSS()); 573 DataBSSSection 574 = getContext().getMachOSection("__DATA","__bss", MCSectionMachO::S_ZEROFILL, 575 SectionKind::getBSS()); 576 577 578 LazySymbolPointerSection 579 = getContext().getMachOSection("__DATA", "__la_symbol_ptr", 580 MCSectionMachO::S_LAZY_SYMBOL_POINTERS, 581 SectionKind::getMetadata()); 582 NonLazySymbolPointerSection 583 = getContext().getMachOSection("__DATA", "__nl_symbol_ptr", 584 MCSectionMachO::S_NON_LAZY_SYMBOL_POINTERS, 585 SectionKind::getMetadata()); 586 587 if (TM.getRelocationModel() == Reloc::Static) { 588 StaticCtorSection 589 = getContext().getMachOSection("__TEXT", "__constructor", 0, 590 SectionKind::getDataRel()); 591 StaticDtorSection 592 = getContext().getMachOSection("__TEXT", "__destructor", 0, 593 SectionKind::getDataRel()); 594 } else { 595 StaticCtorSection 596 = getContext().getMachOSection("__DATA", "__mod_init_func", 597 MCSectionMachO::S_MOD_INIT_FUNC_POINTERS, 598 SectionKind::getDataRel()); 599 StaticDtorSection 600 = getContext().getMachOSection("__DATA", "__mod_term_func", 601 MCSectionMachO::S_MOD_TERM_FUNC_POINTERS, 602 SectionKind::getDataRel()); 603 } 604 605 // Exception Handling. 606 LSDASection = getContext().getMachOSection("__TEXT", "__gcc_except_tab", 0, 607 SectionKind::getReadOnlyWithRel()); 608 609 if (T.isMacOSX() && !T.isMacOSXVersionLT(10, 6)) 610 CompactUnwindSection = 611 getContext().getMachOSection("__LD", "__compact_unwind", 612 MCSectionMachO::S_ATTR_DEBUG, 613 SectionKind::getReadOnly()); 614 615 // Debug Information. 616 DwarfAbbrevSection = 617 getContext().getMachOSection("__DWARF", "__debug_abbrev", 618 MCSectionMachO::S_ATTR_DEBUG, 619 SectionKind::getMetadata()); 620 DwarfInfoSection = 621 getContext().getMachOSection("__DWARF", "__debug_info", 622 MCSectionMachO::S_ATTR_DEBUG, 623 SectionKind::getMetadata()); 624 DwarfLineSection = 625 getContext().getMachOSection("__DWARF", "__debug_line", 626 MCSectionMachO::S_ATTR_DEBUG, 627 SectionKind::getMetadata()); 628 DwarfFrameSection = 629 getContext().getMachOSection("__DWARF", "__debug_frame", 630 MCSectionMachO::S_ATTR_DEBUG, 631 SectionKind::getMetadata()); 632 DwarfPubNamesSection = 633 getContext().getMachOSection("__DWARF", "__debug_pubnames", 634 MCSectionMachO::S_ATTR_DEBUG, 635 SectionKind::getMetadata()); 636 DwarfPubTypesSection = 637 getContext().getMachOSection("__DWARF", "__debug_pubtypes", 638 MCSectionMachO::S_ATTR_DEBUG, 639 SectionKind::getMetadata()); 640 DwarfStrSection = 641 getContext().getMachOSection("__DWARF", "__debug_str", 642 MCSectionMachO::S_ATTR_DEBUG, 643 SectionKind::getMetadata()); 644 DwarfLocSection = 645 getContext().getMachOSection("__DWARF", "__debug_loc", 646 MCSectionMachO::S_ATTR_DEBUG, 647 SectionKind::getMetadata()); 648 DwarfARangesSection = 649 getContext().getMachOSection("__DWARF", "__debug_aranges", 650 MCSectionMachO::S_ATTR_DEBUG, 651 SectionKind::getMetadata()); 652 DwarfRangesSection = 653 getContext().getMachOSection("__DWARF", "__debug_ranges", 654 MCSectionMachO::S_ATTR_DEBUG, 655 SectionKind::getMetadata()); 656 DwarfMacroInfoSection = 657 getContext().getMachOSection("__DWARF", "__debug_macinfo", 658 MCSectionMachO::S_ATTR_DEBUG, 659 SectionKind::getMetadata()); 660 DwarfDebugInlineSection = 661 getContext().getMachOSection("__DWARF", "__debug_inlined", 662 MCSectionMachO::S_ATTR_DEBUG, 663 SectionKind::getMetadata()); 664 665 TLSExtraDataSection = TLSTLVSection; 666 } 667 668 const MCSection *TargetLoweringObjectFileMachO::getEHFrameSection() const { 669 return getContext().getMachOSection("__TEXT", "__eh_frame", 670 MCSectionMachO::S_COALESCED | 671 MCSectionMachO::S_ATTR_NO_TOC | 672 MCSectionMachO::S_ATTR_STRIP_STATIC_SYMS | 673 MCSectionMachO::S_ATTR_LIVE_SUPPORT, 674 SectionKind::getReadOnly()); 675 } 676 677 const MCSection *TargetLoweringObjectFileMachO:: 678 getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind, 679 Mangler *Mang, const TargetMachine &TM) const { 680 // Parse the section specifier and create it if valid. 681 StringRef Segment, Section; 682 unsigned TAA = 0, StubSize = 0; 683 bool TAAParsed; 684 std::string ErrorCode = 685 MCSectionMachO::ParseSectionSpecifier(GV->getSection(), Segment, Section, 686 TAA, TAAParsed, StubSize); 687 if (!ErrorCode.empty()) { 688 // If invalid, report the error with report_fatal_error. 689 report_fatal_error("Global variable '" + GV->getNameStr() + 690 "' has an invalid section specifier '" + GV->getSection()+ 691 "': " + ErrorCode + "."); 692 // Fall back to dropping it into the data section. 693 return DataSection; 694 } 695 696 // Get the section. 697 const MCSectionMachO *S = 698 getContext().getMachOSection(Segment, Section, TAA, StubSize, Kind); 699 700 // If TAA wasn't set by ParseSectionSpecifier() above, 701 // use the value returned by getMachOSection() as a default. 702 if (!TAAParsed) 703 TAA = S->getTypeAndAttributes(); 704 705 // Okay, now that we got the section, verify that the TAA & StubSize agree. 706 // If the user declared multiple globals with different section flags, we need 707 // to reject it here. 708 if (S->getTypeAndAttributes() != TAA || S->getStubSize() != StubSize) { 709 // If invalid, report the error with report_fatal_error. 710 report_fatal_error("Global variable '" + GV->getNameStr() + 711 "' section type or attributes does not match previous" 712 " section specifier"); 713 } 714 715 return S; 716 } 717 718 const MCSection *TargetLoweringObjectFileMachO:: 719 SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind, 720 Mangler *Mang, const TargetMachine &TM) const { 721 722 // Handle thread local data. 723 if (Kind.isThreadBSS()) return TLSBSSSection; 724 if (Kind.isThreadData()) return TLSDataSection; 725 726 if (Kind.isText()) 727 return GV->isWeakForLinker() ? TextCoalSection : TextSection; 728 729 // If this is weak/linkonce, put this in a coalescable section, either in text 730 // or data depending on if it is writable. 731 if (GV->isWeakForLinker()) { 732 if (Kind.isReadOnly()) 733 return ConstTextCoalSection; 734 return DataCoalSection; 735 } 736 737 // FIXME: Alignment check should be handled by section classifier. 738 if (Kind.isMergeable1ByteCString() && 739 TM.getTargetData()->getPreferredAlignment(cast<GlobalVariable>(GV)) < 32) 740 return CStringSection; 741 742 // Do not put 16-bit arrays in the UString section if they have an 743 // externally visible label, this runs into issues with certain linker 744 // versions. 745 if (Kind.isMergeable2ByteCString() && !GV->hasExternalLinkage() && 746 TM.getTargetData()->getPreferredAlignment(cast<GlobalVariable>(GV)) < 32) 747 return UStringSection; 748 749 if (Kind.isMergeableConst()) { 750 if (Kind.isMergeableConst4()) 751 return FourByteConstantSection; 752 if (Kind.isMergeableConst8()) 753 return EightByteConstantSection; 754 if (Kind.isMergeableConst16() && SixteenByteConstantSection) 755 return SixteenByteConstantSection; 756 } 757 758 // Otherwise, if it is readonly, but not something we can specially optimize, 759 // just drop it in .const. 760 if (Kind.isReadOnly()) 761 return ReadOnlySection; 762 763 // If this is marked const, put it into a const section. But if the dynamic 764 // linker needs to write to it, put it in the data segment. 765 if (Kind.isReadOnlyWithRel()) 766 return ConstDataSection; 767 768 // Put zero initialized globals with strong external linkage in the 769 // DATA, __common section with the .zerofill directive. 770 if (Kind.isBSSExtern()) 771 return DataCommonSection; 772 773 // Put zero initialized globals with local linkage in __DATA,__bss directive 774 // with the .zerofill directive (aka .lcomm). 775 if (Kind.isBSSLocal()) 776 return DataBSSSection; 777 778 // Otherwise, just drop the variable in the normal data section. 779 return DataSection; 780 } 781 782 const MCSection * 783 TargetLoweringObjectFileMachO::getSectionForConstant(SectionKind Kind) const { 784 // If this constant requires a relocation, we have to put it in the data 785 // segment, not in the text segment. 786 if (Kind.isDataRel() || Kind.isReadOnlyWithRel()) 787 return ConstDataSection; 788 789 if (Kind.isMergeableConst4()) 790 return FourByteConstantSection; 791 if (Kind.isMergeableConst8()) 792 return EightByteConstantSection; 793 if (Kind.isMergeableConst16() && SixteenByteConstantSection) 794 return SixteenByteConstantSection; 795 return ReadOnlySection; // .const 796 } 797 798 /// shouldEmitUsedDirectiveFor - This hook allows targets to selectively decide 799 /// not to emit the UsedDirective for some symbols in llvm.used. 800 // FIXME: REMOVE this (rdar://7071300) 801 bool TargetLoweringObjectFileMachO:: 802 shouldEmitUsedDirectiveFor(const GlobalValue *GV, Mangler *Mang) const { 803 /// On Darwin, internally linked data beginning with "L" or "l" does not have 804 /// the directive emitted (this occurs in ObjC metadata). 805 if (!GV) return false; 806 807 // Check whether the mangled name has the "Private" or "LinkerPrivate" prefix. 808 if (GV->hasLocalLinkage() && !isa<Function>(GV)) { 809 // FIXME: ObjC metadata is currently emitted as internal symbols that have 810 // \1L and \0l prefixes on them. Fix them to be Private/LinkerPrivate and 811 // this horrible hack can go away. 812 MCSymbol *Sym = Mang->getSymbol(GV); 813 if (Sym->getName()[0] == 'L' || Sym->getName()[0] == 'l') 814 return false; 815 } 816 817 return true; 818 } 819 820 const MCExpr *TargetLoweringObjectFileMachO:: 821 getExprForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang, 822 MachineModuleInfo *MMI, unsigned Encoding, 823 MCStreamer &Streamer) const { 824 // The mach-o version of this method defaults to returning a stub reference. 825 826 if (Encoding & DW_EH_PE_indirect) { 827 MachineModuleInfoMachO &MachOMMI = 828 MMI->getObjFileInfo<MachineModuleInfoMachO>(); 829 830 SmallString<128> Name; 831 Mang->getNameWithPrefix(Name, GV, true); 832 Name += "$non_lazy_ptr"; 833 834 // Add information about the stub reference to MachOMMI so that the stub 835 // gets emitted by the asmprinter. 836 MCSymbol *SSym = getContext().GetOrCreateSymbol(Name.str()); 837 MachineModuleInfoImpl::StubValueTy &StubSym = MachOMMI.getGVStubEntry(SSym); 838 if (StubSym.getPointer() == 0) { 839 MCSymbol *Sym = Mang->getSymbol(GV); 840 StubSym = MachineModuleInfoImpl::StubValueTy(Sym, !GV->hasLocalLinkage()); 841 } 842 843 return TargetLoweringObjectFile:: 844 getExprForDwarfReference(SSym, Encoding & ~dwarf::DW_EH_PE_indirect, Streamer); 845 } 846 847 return TargetLoweringObjectFile:: 848 getExprForDwarfGlobalReference(GV, Mang, MMI, Encoding, Streamer); 849 } 850 851 MCSymbol *TargetLoweringObjectFileMachO:: 852 getCFIPersonalitySymbol(const GlobalValue *GV, Mangler *Mang, 853 MachineModuleInfo *MMI) const { 854 // The mach-o version of this method defaults to returning a stub reference. 855 MachineModuleInfoMachO &MachOMMI = 856 MMI->getObjFileInfo<MachineModuleInfoMachO>(); 857 858 SmallString<128> Name; 859 Mang->getNameWithPrefix(Name, GV, true); 860 Name += "$non_lazy_ptr"; 861 862 // Add information about the stub reference to MachOMMI so that the stub 863 // gets emitted by the asmprinter. 864 MCSymbol *SSym = getContext().GetOrCreateSymbol(Name.str()); 865 MachineModuleInfoImpl::StubValueTy &StubSym = MachOMMI.getGVStubEntry(SSym); 866 if (StubSym.getPointer() == 0) { 867 MCSymbol *Sym = Mang->getSymbol(GV); 868 StubSym = MachineModuleInfoImpl::StubValueTy(Sym, !GV->hasLocalLinkage()); 869 } 870 871 return SSym; 872 } 873 874 unsigned TargetLoweringObjectFileMachO::getPersonalityEncoding() const { 875 return DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4; 876 } 877 878 unsigned TargetLoweringObjectFileMachO::getLSDAEncoding() const { 879 return DW_EH_PE_pcrel; 880 } 881 882 unsigned TargetLoweringObjectFileMachO::getFDEEncoding(bool CFI) const { 883 return DW_EH_PE_pcrel; 884 } 885 886 unsigned TargetLoweringObjectFileMachO::getTTypeEncoding() const { 887 return DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4; 888 } 889 890 //===----------------------------------------------------------------------===// 891 // COFF 892 //===----------------------------------------------------------------------===// 893 894 void TargetLoweringObjectFileCOFF::Initialize(MCContext &Ctx, 895 const TargetMachine &TM) { 896 TargetLoweringObjectFile::Initialize(Ctx, TM); 897 TextSection = 898 getContext().getCOFFSection(".text", 899 COFF::IMAGE_SCN_CNT_CODE | 900 COFF::IMAGE_SCN_MEM_EXECUTE | 901 COFF::IMAGE_SCN_MEM_READ, 902 SectionKind::getText()); 903 DataSection = 904 getContext().getCOFFSection(".data", 905 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 906 COFF::IMAGE_SCN_MEM_READ | 907 COFF::IMAGE_SCN_MEM_WRITE, 908 SectionKind::getDataRel()); 909 ReadOnlySection = 910 getContext().getCOFFSection(".rdata", 911 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 912 COFF::IMAGE_SCN_MEM_READ, 913 SectionKind::getReadOnly()); 914 StaticCtorSection = 915 getContext().getCOFFSection(".ctors", 916 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 917 COFF::IMAGE_SCN_MEM_READ | 918 COFF::IMAGE_SCN_MEM_WRITE, 919 SectionKind::getDataRel()); 920 StaticDtorSection = 921 getContext().getCOFFSection(".dtors", 922 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 923 COFF::IMAGE_SCN_MEM_READ | 924 COFF::IMAGE_SCN_MEM_WRITE, 925 SectionKind::getDataRel()); 926 927 // FIXME: We're emitting LSDA info into a readonly section on COFF, even 928 // though it contains relocatable pointers. In PIC mode, this is probably a 929 // big runtime hit for C++ apps. Either the contents of the LSDA need to be 930 // adjusted or this should be a data section. 931 LSDASection = 932 getContext().getCOFFSection(".gcc_except_table", 933 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 934 COFF::IMAGE_SCN_MEM_READ, 935 SectionKind::getReadOnly()); 936 // Debug info. 937 DwarfAbbrevSection = 938 getContext().getCOFFSection(".debug_abbrev", 939 COFF::IMAGE_SCN_MEM_DISCARDABLE | 940 COFF::IMAGE_SCN_MEM_READ, 941 SectionKind::getMetadata()); 942 DwarfInfoSection = 943 getContext().getCOFFSection(".debug_info", 944 COFF::IMAGE_SCN_MEM_DISCARDABLE | 945 COFF::IMAGE_SCN_MEM_READ, 946 SectionKind::getMetadata()); 947 DwarfLineSection = 948 getContext().getCOFFSection(".debug_line", 949 COFF::IMAGE_SCN_MEM_DISCARDABLE | 950 COFF::IMAGE_SCN_MEM_READ, 951 SectionKind::getMetadata()); 952 DwarfFrameSection = 953 getContext().getCOFFSection(".debug_frame", 954 COFF::IMAGE_SCN_MEM_DISCARDABLE | 955 COFF::IMAGE_SCN_MEM_READ, 956 SectionKind::getMetadata()); 957 DwarfPubNamesSection = 958 getContext().getCOFFSection(".debug_pubnames", 959 COFF::IMAGE_SCN_MEM_DISCARDABLE | 960 COFF::IMAGE_SCN_MEM_READ, 961 SectionKind::getMetadata()); 962 DwarfPubTypesSection = 963 getContext().getCOFFSection(".debug_pubtypes", 964 COFF::IMAGE_SCN_MEM_DISCARDABLE | 965 COFF::IMAGE_SCN_MEM_READ, 966 SectionKind::getMetadata()); 967 DwarfStrSection = 968 getContext().getCOFFSection(".debug_str", 969 COFF::IMAGE_SCN_MEM_DISCARDABLE | 970 COFF::IMAGE_SCN_MEM_READ, 971 SectionKind::getMetadata()); 972 DwarfLocSection = 973 getContext().getCOFFSection(".debug_loc", 974 COFF::IMAGE_SCN_MEM_DISCARDABLE | 975 COFF::IMAGE_SCN_MEM_READ, 976 SectionKind::getMetadata()); 977 DwarfARangesSection = 978 getContext().getCOFFSection(".debug_aranges", 979 COFF::IMAGE_SCN_MEM_DISCARDABLE | 980 COFF::IMAGE_SCN_MEM_READ, 981 SectionKind::getMetadata()); 982 DwarfRangesSection = 983 getContext().getCOFFSection(".debug_ranges", 984 COFF::IMAGE_SCN_MEM_DISCARDABLE | 985 COFF::IMAGE_SCN_MEM_READ, 986 SectionKind::getMetadata()); 987 DwarfMacroInfoSection = 988 getContext().getCOFFSection(".debug_macinfo", 989 COFF::IMAGE_SCN_MEM_DISCARDABLE | 990 COFF::IMAGE_SCN_MEM_READ, 991 SectionKind::getMetadata()); 992 993 DrectveSection = 994 getContext().getCOFFSection(".drectve", 995 COFF::IMAGE_SCN_LNK_INFO, 996 SectionKind::getMetadata()); 997 998 PDataSection = 999 getContext().getCOFFSection(".pdata", 1000 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 1001 COFF::IMAGE_SCN_MEM_READ | 1002 COFF::IMAGE_SCN_MEM_WRITE, 1003 SectionKind::getDataRel()); 1004 1005 XDataSection = 1006 getContext().getCOFFSection(".xdata", 1007 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 1008 COFF::IMAGE_SCN_MEM_READ | 1009 COFF::IMAGE_SCN_MEM_WRITE, 1010 SectionKind::getDataRel()); 1011 } 1012 1013 const MCSection *TargetLoweringObjectFileCOFF::getEHFrameSection() const { 1014 return getContext().getCOFFSection(".eh_frame", 1015 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 1016 COFF::IMAGE_SCN_MEM_READ | 1017 COFF::IMAGE_SCN_MEM_WRITE, 1018 SectionKind::getDataRel()); 1019 } 1020 1021 const MCSection *TargetLoweringObjectFileCOFF::getWin64EHFuncTableSection( 1022 StringRef suffix) const { 1023 if (suffix == "") 1024 return PDataSection; 1025 return getContext().getCOFFSection((".pdata"+suffix).str(), 1026 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 1027 COFF::IMAGE_SCN_MEM_READ | 1028 COFF::IMAGE_SCN_MEM_WRITE, 1029 SectionKind::getDataRel()); 1030 } 1031 1032 const MCSection *TargetLoweringObjectFileCOFF::getWin64EHTableSection( 1033 StringRef suffix) const { 1034 if (suffix == "") 1035 return XDataSection; 1036 return getContext().getCOFFSection((".xdata"+suffix).str(), 1037 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 1038 COFF::IMAGE_SCN_MEM_READ | 1039 COFF::IMAGE_SCN_MEM_WRITE, 1040 SectionKind::getDataRel()); 1041 } 1042 1043 1044 static unsigned 1045 getCOFFSectionFlags(SectionKind K) { 1046 unsigned Flags = 0; 1047 1048 if (K.isMetadata()) 1049 Flags |= 1050 COFF::IMAGE_SCN_MEM_DISCARDABLE; 1051 else if (K.isText()) 1052 Flags |= 1053 COFF::IMAGE_SCN_MEM_EXECUTE | 1054 COFF::IMAGE_SCN_MEM_READ | 1055 COFF::IMAGE_SCN_CNT_CODE; 1056 else if (K.isBSS ()) 1057 Flags |= 1058 COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA | 1059 COFF::IMAGE_SCN_MEM_READ | 1060 COFF::IMAGE_SCN_MEM_WRITE; 1061 else if (K.isReadOnly()) 1062 Flags |= 1063 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 1064 COFF::IMAGE_SCN_MEM_READ; 1065 else if (K.isWriteable()) 1066 Flags |= 1067 COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 1068 COFF::IMAGE_SCN_MEM_READ | 1069 COFF::IMAGE_SCN_MEM_WRITE; 1070 1071 return Flags; 1072 } 1073 1074 const MCSection *TargetLoweringObjectFileCOFF:: 1075 getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind, 1076 Mangler *Mang, const TargetMachine &TM) const { 1077 return getContext().getCOFFSection(GV->getSection(), 1078 getCOFFSectionFlags(Kind), 1079 Kind); 1080 } 1081 1082 static const char *getCOFFSectionPrefixForUniqueGlobal(SectionKind Kind) { 1083 if (Kind.isText()) 1084 return ".text$"; 1085 if (Kind.isBSS ()) 1086 return ".bss$"; 1087 if (Kind.isWriteable()) 1088 return ".data$"; 1089 return ".rdata$"; 1090 } 1091 1092 1093 const MCSection *TargetLoweringObjectFileCOFF:: 1094 SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind, 1095 Mangler *Mang, const TargetMachine &TM) const { 1096 assert(!Kind.isThreadLocal() && "Doesn't support TLS"); 1097 1098 // If this global is linkonce/weak and the target handles this by emitting it 1099 // into a 'uniqued' section name, create and return the section now. 1100 if (GV->isWeakForLinker()) { 1101 const char *Prefix = getCOFFSectionPrefixForUniqueGlobal(Kind); 1102 SmallString<128> Name(Prefix, Prefix+strlen(Prefix)); 1103 MCSymbol *Sym = Mang->getSymbol(GV); 1104 Name.append(Sym->getName().begin() + 1, Sym->getName().end()); 1105 1106 unsigned Characteristics = getCOFFSectionFlags(Kind); 1107 1108 Characteristics |= COFF::IMAGE_SCN_LNK_COMDAT; 1109 1110 return getContext().getCOFFSection(Name.str(), Characteristics, 1111 COFF::IMAGE_COMDAT_SELECT_ANY, Kind); 1112 } 1113 1114 if (Kind.isText()) 1115 return getTextSection(); 1116 1117 return getDataSection(); 1118 } 1119 1120