1 //===- ObjectFile.h - File format independent object file -------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file declares a file format independent ObjectFile class. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #ifndef LLVM_OBJECT_OBJECTFILE_H 14 #define LLVM_OBJECT_OBJECTFILE_H 15 16 #include "llvm/ADT/ArrayRef.h" 17 #include "llvm/ADT/Hashing.h" 18 #include "llvm/ADT/StringRef.h" 19 #include "llvm/ADT/iterator_range.h" 20 #include "llvm/BinaryFormat/Magic.h" 21 #include "llvm/BinaryFormat/Swift.h" 22 #include "llvm/Object/Binary.h" 23 #include "llvm/Object/Error.h" 24 #include "llvm/Object/SymbolicFile.h" 25 #include "llvm/Support/Casting.h" 26 #include "llvm/Support/Error.h" 27 #include "llvm/Support/MemoryBufferRef.h" 28 #include "llvm/TargetParser/Triple.h" 29 #include <cassert> 30 #include <cstdint> 31 #include <memory> 32 33 namespace llvm { 34 35 class SubtargetFeatures; 36 37 namespace object { 38 39 class COFFObjectFile; 40 class MachOObjectFile; 41 class ObjectFile; 42 class SectionRef; 43 class SymbolRef; 44 class symbol_iterator; 45 class WasmObjectFile; 46 47 using section_iterator = content_iterator<SectionRef>; 48 49 typedef std::function<bool(const SectionRef &)> SectionFilterPredicate; 50 /// This is a value type class that represents a single relocation in the list 51 /// of relocations in the object file. 52 class RelocationRef { 53 DataRefImpl RelocationPimpl; 54 const ObjectFile *OwningObject = nullptr; 55 56 public: 57 RelocationRef() = default; 58 RelocationRef(DataRefImpl RelocationP, const ObjectFile *Owner); 59 60 bool operator==(const RelocationRef &Other) const; 61 62 void moveNext(); 63 64 uint64_t getOffset() const; 65 symbol_iterator getSymbol() const; 66 uint64_t getType() const; 67 68 /// Get a string that represents the type of this relocation. 69 /// 70 /// This is for display purposes only. 71 void getTypeName(SmallVectorImpl<char> &Result) const; 72 73 DataRefImpl getRawDataRefImpl() const; 74 const ObjectFile *getObject() const; 75 }; 76 77 using relocation_iterator = content_iterator<RelocationRef>; 78 79 /// This is a value type class that represents a single section in the list of 80 /// sections in the object file. 81 class SectionRef { 82 friend class SymbolRef; 83 84 DataRefImpl SectionPimpl; 85 const ObjectFile *OwningObject = nullptr; 86 87 public: 88 SectionRef() = default; 89 SectionRef(DataRefImpl SectionP, const ObjectFile *Owner); 90 91 bool operator==(const SectionRef &Other) const; 92 bool operator!=(const SectionRef &Other) const; 93 bool operator<(const SectionRef &Other) const; 94 95 void moveNext(); 96 97 Expected<StringRef> getName() const; 98 uint64_t getAddress() const; 99 uint64_t getIndex() const; 100 uint64_t getSize() const; 101 Expected<StringRef> getContents() const; 102 103 /// Get the alignment of this section. 104 Align getAlignment() const; 105 106 bool isCompressed() const; 107 /// Whether this section contains instructions. 108 bool isText() const; 109 /// Whether this section contains data, not instructions. 110 bool isData() const; 111 /// Whether this section contains BSS uninitialized data. 112 bool isBSS() const; 113 bool isVirtual() const; 114 bool isBitcode() const; 115 bool isStripped() const; 116 117 /// Whether this section will be placed in the text segment, according to the 118 /// Berkeley size format. This is true if the section is allocatable, and 119 /// contains either code or readonly data. 120 bool isBerkeleyText() const; 121 /// Whether this section will be placed in the data segment, according to the 122 /// Berkeley size format. This is true if the section is allocatable and 123 /// contains data (e.g. PROGBITS), but is not text. 124 bool isBerkeleyData() const; 125 126 /// Whether this section is a debug section. 127 bool isDebugSection() const; 128 129 bool containsSymbol(SymbolRef S) const; 130 131 relocation_iterator relocation_begin() const; 132 relocation_iterator relocation_end() const; 133 iterator_range<relocation_iterator> relocations() const { 134 return make_range(relocation_begin(), relocation_end()); 135 } 136 137 /// Returns the related section if this section contains relocations. The 138 /// returned section may or may not have applied its relocations. 139 Expected<section_iterator> getRelocatedSection() const; 140 141 DataRefImpl getRawDataRefImpl() const; 142 const ObjectFile *getObject() const; 143 }; 144 145 struct SectionedAddress { 146 const static uint64_t UndefSection = UINT64_MAX; 147 148 uint64_t Address = 0; 149 uint64_t SectionIndex = UndefSection; 150 }; 151 152 inline bool operator<(const SectionedAddress &LHS, 153 const SectionedAddress &RHS) { 154 return std::tie(LHS.SectionIndex, LHS.Address) < 155 std::tie(RHS.SectionIndex, RHS.Address); 156 } 157 158 inline bool operator==(const SectionedAddress &LHS, 159 const SectionedAddress &RHS) { 160 return std::tie(LHS.SectionIndex, LHS.Address) == 161 std::tie(RHS.SectionIndex, RHS.Address); 162 } 163 164 raw_ostream &operator<<(raw_ostream &OS, const SectionedAddress &Addr); 165 166 /// This is a value type class that represents a single symbol in the list of 167 /// symbols in the object file. 168 class SymbolRef : public BasicSymbolRef { 169 friend class SectionRef; 170 171 public: 172 enum Type { 173 ST_Unknown, // Type not specified 174 ST_Other, 175 ST_Data, 176 ST_Debug, 177 ST_File, 178 ST_Function, 179 }; 180 181 SymbolRef() = default; 182 SymbolRef(DataRefImpl SymbolP, const ObjectFile *Owner); 183 SymbolRef(const BasicSymbolRef &B) : BasicSymbolRef(B) { 184 assert(isa<ObjectFile>(BasicSymbolRef::getObject())); 185 } 186 187 Expected<StringRef> getName() const; 188 /// Returns the symbol virtual address (i.e. address at which it will be 189 /// mapped). 190 Expected<uint64_t> getAddress() const; 191 192 /// Return the value of the symbol depending on the object this can be an 193 /// offset or a virtual address. 194 Expected<uint64_t> getValue() const; 195 196 /// Get the alignment of this symbol as the actual value (not log 2). 197 uint32_t getAlignment() const; 198 uint64_t getCommonSize() const; 199 Expected<SymbolRef::Type> getType() const; 200 201 /// Get section this symbol is defined in reference to. Result is 202 /// end_sections() if it is undefined or is an absolute symbol. 203 Expected<section_iterator> getSection() const; 204 205 const ObjectFile *getObject() const; 206 }; 207 208 class symbol_iterator : public basic_symbol_iterator { 209 public: 210 symbol_iterator(SymbolRef Sym) : basic_symbol_iterator(Sym) {} 211 symbol_iterator(const basic_symbol_iterator &B) 212 : basic_symbol_iterator(SymbolRef(B->getRawDataRefImpl(), 213 cast<ObjectFile>(B->getObject()))) {} 214 215 const SymbolRef *operator->() const { 216 const BasicSymbolRef &P = basic_symbol_iterator::operator *(); 217 return static_cast<const SymbolRef*>(&P); 218 } 219 220 const SymbolRef &operator*() const { 221 const BasicSymbolRef &P = basic_symbol_iterator::operator *(); 222 return static_cast<const SymbolRef&>(P); 223 } 224 }; 225 226 /// This class is the base class for all object file types. Concrete instances 227 /// of this object are created by createObjectFile, which figures out which type 228 /// to create. 229 class ObjectFile : public SymbolicFile { 230 virtual void anchor(); 231 232 protected: 233 ObjectFile(unsigned int Type, MemoryBufferRef Source); 234 235 const uint8_t *base() const { 236 return reinterpret_cast<const uint8_t *>(Data.getBufferStart()); 237 } 238 239 // These functions are for SymbolRef to call internally. The main goal of 240 // this is to allow SymbolRef::SymbolPimpl to point directly to the symbol 241 // entry in the memory mapped object file. SymbolPimpl cannot contain any 242 // virtual functions because then it could not point into the memory mapped 243 // file. 244 // 245 // Implementations assume that the DataRefImpl is valid and has not been 246 // modified externally. It's UB otherwise. 247 friend class SymbolRef; 248 249 virtual Expected<StringRef> getSymbolName(DataRefImpl Symb) const = 0; 250 Error printSymbolName(raw_ostream &OS, 251 DataRefImpl Symb) const override; 252 virtual Expected<uint64_t> getSymbolAddress(DataRefImpl Symb) const = 0; 253 virtual uint64_t getSymbolValueImpl(DataRefImpl Symb) const = 0; 254 virtual uint32_t getSymbolAlignment(DataRefImpl Symb) const; 255 virtual uint64_t getCommonSymbolSizeImpl(DataRefImpl Symb) const = 0; 256 virtual Expected<SymbolRef::Type> getSymbolType(DataRefImpl Symb) const = 0; 257 virtual Expected<section_iterator> 258 getSymbolSection(DataRefImpl Symb) const = 0; 259 260 // Same as above for SectionRef. 261 friend class SectionRef; 262 263 virtual void moveSectionNext(DataRefImpl &Sec) const = 0; 264 virtual Expected<StringRef> getSectionName(DataRefImpl Sec) const = 0; 265 virtual uint64_t getSectionAddress(DataRefImpl Sec) const = 0; 266 virtual uint64_t getSectionIndex(DataRefImpl Sec) const = 0; 267 virtual uint64_t getSectionSize(DataRefImpl Sec) const = 0; 268 virtual Expected<ArrayRef<uint8_t>> 269 getSectionContents(DataRefImpl Sec) const = 0; 270 virtual uint64_t getSectionAlignment(DataRefImpl Sec) const = 0; 271 virtual bool isSectionCompressed(DataRefImpl Sec) const = 0; 272 virtual bool isSectionText(DataRefImpl Sec) const = 0; 273 virtual bool isSectionData(DataRefImpl Sec) const = 0; 274 virtual bool isSectionBSS(DataRefImpl Sec) const = 0; 275 // A section is 'virtual' if its contents aren't present in the object image. 276 virtual bool isSectionVirtual(DataRefImpl Sec) const = 0; 277 virtual bool isSectionBitcode(DataRefImpl Sec) const; 278 virtual bool isSectionStripped(DataRefImpl Sec) const; 279 virtual bool isBerkeleyText(DataRefImpl Sec) const; 280 virtual bool isBerkeleyData(DataRefImpl Sec) const; 281 virtual bool isDebugSection(DataRefImpl Sec) const; 282 virtual relocation_iterator section_rel_begin(DataRefImpl Sec) const = 0; 283 virtual relocation_iterator section_rel_end(DataRefImpl Sec) const = 0; 284 virtual Expected<section_iterator> getRelocatedSection(DataRefImpl Sec) const; 285 286 // Same as above for RelocationRef. 287 friend class RelocationRef; 288 virtual void moveRelocationNext(DataRefImpl &Rel) const = 0; 289 virtual uint64_t getRelocationOffset(DataRefImpl Rel) const = 0; 290 virtual symbol_iterator getRelocationSymbol(DataRefImpl Rel) const = 0; 291 virtual uint64_t getRelocationType(DataRefImpl Rel) const = 0; 292 virtual void getRelocationTypeName(DataRefImpl Rel, 293 SmallVectorImpl<char> &Result) const = 0; 294 295 virtual llvm::binaryformat::Swift5ReflectionSectionKind 296 mapReflectionSectionNameToEnumValue(StringRef SectionName) const { 297 return llvm::binaryformat::Swift5ReflectionSectionKind::unknown; 298 }; 299 300 Expected<uint64_t> getSymbolValue(DataRefImpl Symb) const; 301 302 public: 303 ObjectFile() = delete; 304 ObjectFile(const ObjectFile &other) = delete; 305 306 uint64_t getCommonSymbolSize(DataRefImpl Symb) const { 307 Expected<uint32_t> SymbolFlagsOrErr = getSymbolFlags(Symb); 308 if (!SymbolFlagsOrErr) 309 // TODO: Actually report errors helpfully. 310 report_fatal_error(SymbolFlagsOrErr.takeError()); 311 assert(*SymbolFlagsOrErr & SymbolRef::SF_Common); 312 return getCommonSymbolSizeImpl(Symb); 313 } 314 315 virtual std::vector<SectionRef> dynamic_relocation_sections() const { 316 return std::vector<SectionRef>(); 317 } 318 319 using symbol_iterator_range = iterator_range<symbol_iterator>; 320 symbol_iterator_range symbols() const { 321 return symbol_iterator_range(symbol_begin(), symbol_end()); 322 } 323 324 virtual section_iterator section_begin() const = 0; 325 virtual section_iterator section_end() const = 0; 326 327 using section_iterator_range = iterator_range<section_iterator>; 328 section_iterator_range sections() const { 329 return section_iterator_range(section_begin(), section_end()); 330 } 331 332 virtual bool hasDebugInfo() const; 333 334 /// The number of bytes used to represent an address in this object 335 /// file format. 336 virtual uint8_t getBytesInAddress() const = 0; 337 338 virtual StringRef getFileFormatName() const = 0; 339 virtual Triple::ArchType getArch() const = 0; 340 virtual Expected<SubtargetFeatures> getFeatures() const = 0; 341 virtual std::optional<StringRef> tryGetCPUName() const { 342 return std::nullopt; 343 }; 344 virtual void setARMSubArch(Triple &TheTriple) const { } 345 virtual Expected<uint64_t> getStartAddress() const { 346 return errorCodeToError(object_error::parse_failed); 347 }; 348 349 /// Create a triple from the data in this object file. 350 Triple makeTriple() const; 351 352 /// Maps a debug section name to a standard DWARF section name. 353 virtual StringRef mapDebugSectionName(StringRef Name) const { return Name; } 354 355 /// True if this is a relocatable object (.o/.obj). 356 virtual bool isRelocatableObject() const = 0; 357 358 /// True if the reflection section can be stripped by the linker. 359 bool isReflectionSectionStrippable( 360 llvm::binaryformat::Swift5ReflectionSectionKind ReflectionSectionKind) 361 const; 362 363 /// @returns Pointer to ObjectFile subclass to handle this type of object. 364 /// @param ObjectPath The path to the object file. ObjectPath.isObject must 365 /// return true. 366 /// Create ObjectFile from path. 367 static Expected<OwningBinary<ObjectFile>> 368 createObjectFile(StringRef ObjectPath); 369 370 static Expected<std::unique_ptr<ObjectFile>> 371 createObjectFile(MemoryBufferRef Object, llvm::file_magic Type, 372 bool InitContent = true); 373 static Expected<std::unique_ptr<ObjectFile>> 374 createObjectFile(MemoryBufferRef Object) { 375 return createObjectFile(Object, llvm::file_magic::unknown); 376 } 377 378 static bool classof(const Binary *v) { 379 return v->isObject(); 380 } 381 382 static Expected<std::unique_ptr<COFFObjectFile>> 383 createCOFFObjectFile(MemoryBufferRef Object); 384 385 static Expected<std::unique_ptr<ObjectFile>> 386 createXCOFFObjectFile(MemoryBufferRef Object, unsigned FileType); 387 388 static Expected<std::unique_ptr<ObjectFile>> 389 createELFObjectFile(MemoryBufferRef Object, bool InitContent = true); 390 391 static Expected<std::unique_ptr<MachOObjectFile>> 392 createMachOObjectFile(MemoryBufferRef Object, uint32_t UniversalCputype = 0, 393 uint32_t UniversalIndex = 0, 394 size_t MachOFilesetEntryOffset = 0); 395 396 static Expected<std::unique_ptr<ObjectFile>> 397 createGOFFObjectFile(MemoryBufferRef Object); 398 399 static Expected<std::unique_ptr<WasmObjectFile>> 400 createWasmObjectFile(MemoryBufferRef Object); 401 }; 402 403 /// A filtered iterator for SectionRefs that skips sections based on some given 404 /// predicate. 405 class SectionFilterIterator { 406 public: 407 SectionFilterIterator(SectionFilterPredicate Pred, 408 const section_iterator &Begin, 409 const section_iterator &End) 410 : Predicate(std::move(Pred)), Iterator(Begin), End(End) { 411 scanPredicate(); 412 } 413 const SectionRef &operator*() const { return *Iterator; } 414 SectionFilterIterator &operator++() { 415 ++Iterator; 416 scanPredicate(); 417 return *this; 418 } 419 bool operator!=(const SectionFilterIterator &Other) const { 420 return Iterator != Other.Iterator; 421 } 422 423 private: 424 void scanPredicate() { 425 while (Iterator != End && !Predicate(*Iterator)) { 426 ++Iterator; 427 } 428 } 429 SectionFilterPredicate Predicate; 430 section_iterator Iterator; 431 section_iterator End; 432 }; 433 434 /// Creates an iterator range of SectionFilterIterators for a given Object and 435 /// predicate. 436 class SectionFilter { 437 public: 438 SectionFilter(SectionFilterPredicate Pred, const ObjectFile &Obj) 439 : Predicate(std::move(Pred)), Object(Obj) {} 440 SectionFilterIterator begin() { 441 return SectionFilterIterator(Predicate, Object.section_begin(), 442 Object.section_end()); 443 } 444 SectionFilterIterator end() { 445 return SectionFilterIterator(Predicate, Object.section_end(), 446 Object.section_end()); 447 } 448 449 private: 450 SectionFilterPredicate Predicate; 451 const ObjectFile &Object; 452 }; 453 454 // Inline function definitions. 455 inline SymbolRef::SymbolRef(DataRefImpl SymbolP, const ObjectFile *Owner) 456 : BasicSymbolRef(SymbolP, Owner) {} 457 458 inline Expected<StringRef> SymbolRef::getName() const { 459 return getObject()->getSymbolName(getRawDataRefImpl()); 460 } 461 462 inline Expected<uint64_t> SymbolRef::getAddress() const { 463 return getObject()->getSymbolAddress(getRawDataRefImpl()); 464 } 465 466 inline Expected<uint64_t> SymbolRef::getValue() const { 467 return getObject()->getSymbolValue(getRawDataRefImpl()); 468 } 469 470 inline uint32_t SymbolRef::getAlignment() const { 471 return getObject()->getSymbolAlignment(getRawDataRefImpl()); 472 } 473 474 inline uint64_t SymbolRef::getCommonSize() const { 475 return getObject()->getCommonSymbolSize(getRawDataRefImpl()); 476 } 477 478 inline Expected<section_iterator> SymbolRef::getSection() const { 479 return getObject()->getSymbolSection(getRawDataRefImpl()); 480 } 481 482 inline Expected<SymbolRef::Type> SymbolRef::getType() const { 483 return getObject()->getSymbolType(getRawDataRefImpl()); 484 } 485 486 inline const ObjectFile *SymbolRef::getObject() const { 487 const SymbolicFile *O = BasicSymbolRef::getObject(); 488 return cast<ObjectFile>(O); 489 } 490 491 /// SectionRef 492 inline SectionRef::SectionRef(DataRefImpl SectionP, 493 const ObjectFile *Owner) 494 : SectionPimpl(SectionP) 495 , OwningObject(Owner) {} 496 497 inline bool SectionRef::operator==(const SectionRef &Other) const { 498 return OwningObject == Other.OwningObject && 499 SectionPimpl == Other.SectionPimpl; 500 } 501 502 inline bool SectionRef::operator!=(const SectionRef &Other) const { 503 return !(*this == Other); 504 } 505 506 inline bool SectionRef::operator<(const SectionRef &Other) const { 507 assert(OwningObject == Other.OwningObject); 508 return SectionPimpl < Other.SectionPimpl; 509 } 510 511 inline void SectionRef::moveNext() { 512 return OwningObject->moveSectionNext(SectionPimpl); 513 } 514 515 inline Expected<StringRef> SectionRef::getName() const { 516 return OwningObject->getSectionName(SectionPimpl); 517 } 518 519 inline uint64_t SectionRef::getAddress() const { 520 return OwningObject->getSectionAddress(SectionPimpl); 521 } 522 523 inline uint64_t SectionRef::getIndex() const { 524 return OwningObject->getSectionIndex(SectionPimpl); 525 } 526 527 inline uint64_t SectionRef::getSize() const { 528 return OwningObject->getSectionSize(SectionPimpl); 529 } 530 531 inline Expected<StringRef> SectionRef::getContents() const { 532 Expected<ArrayRef<uint8_t>> Res = 533 OwningObject->getSectionContents(SectionPimpl); 534 if (!Res) 535 return Res.takeError(); 536 return StringRef(reinterpret_cast<const char *>(Res->data()), Res->size()); 537 } 538 539 inline Align SectionRef::getAlignment() const { 540 return MaybeAlign(OwningObject->getSectionAlignment(SectionPimpl)) 541 .valueOrOne(); 542 } 543 544 inline bool SectionRef::isCompressed() const { 545 return OwningObject->isSectionCompressed(SectionPimpl); 546 } 547 548 inline bool SectionRef::isText() const { 549 return OwningObject->isSectionText(SectionPimpl); 550 } 551 552 inline bool SectionRef::isData() const { 553 return OwningObject->isSectionData(SectionPimpl); 554 } 555 556 inline bool SectionRef::isBSS() const { 557 return OwningObject->isSectionBSS(SectionPimpl); 558 } 559 560 inline bool SectionRef::isVirtual() const { 561 return OwningObject->isSectionVirtual(SectionPimpl); 562 } 563 564 inline bool SectionRef::isBitcode() const { 565 return OwningObject->isSectionBitcode(SectionPimpl); 566 } 567 568 inline bool SectionRef::isStripped() const { 569 return OwningObject->isSectionStripped(SectionPimpl); 570 } 571 572 inline bool SectionRef::isBerkeleyText() const { 573 return OwningObject->isBerkeleyText(SectionPimpl); 574 } 575 576 inline bool SectionRef::isBerkeleyData() const { 577 return OwningObject->isBerkeleyData(SectionPimpl); 578 } 579 580 inline bool SectionRef::isDebugSection() const { 581 return OwningObject->isDebugSection(SectionPimpl); 582 } 583 584 inline relocation_iterator SectionRef::relocation_begin() const { 585 return OwningObject->section_rel_begin(SectionPimpl); 586 } 587 588 inline relocation_iterator SectionRef::relocation_end() const { 589 return OwningObject->section_rel_end(SectionPimpl); 590 } 591 592 inline Expected<section_iterator> SectionRef::getRelocatedSection() const { 593 return OwningObject->getRelocatedSection(SectionPimpl); 594 } 595 596 inline DataRefImpl SectionRef::getRawDataRefImpl() const { 597 return SectionPimpl; 598 } 599 600 inline const ObjectFile *SectionRef::getObject() const { 601 return OwningObject; 602 } 603 604 /// RelocationRef 605 inline RelocationRef::RelocationRef(DataRefImpl RelocationP, 606 const ObjectFile *Owner) 607 : RelocationPimpl(RelocationP) 608 , OwningObject(Owner) {} 609 610 inline bool RelocationRef::operator==(const RelocationRef &Other) const { 611 return RelocationPimpl == Other.RelocationPimpl; 612 } 613 614 inline void RelocationRef::moveNext() { 615 return OwningObject->moveRelocationNext(RelocationPimpl); 616 } 617 618 inline uint64_t RelocationRef::getOffset() const { 619 return OwningObject->getRelocationOffset(RelocationPimpl); 620 } 621 622 inline symbol_iterator RelocationRef::getSymbol() const { 623 return OwningObject->getRelocationSymbol(RelocationPimpl); 624 } 625 626 inline uint64_t RelocationRef::getType() const { 627 return OwningObject->getRelocationType(RelocationPimpl); 628 } 629 630 inline void RelocationRef::getTypeName(SmallVectorImpl<char> &Result) const { 631 return OwningObject->getRelocationTypeName(RelocationPimpl, Result); 632 } 633 634 inline DataRefImpl RelocationRef::getRawDataRefImpl() const { 635 return RelocationPimpl; 636 } 637 638 inline const ObjectFile *RelocationRef::getObject() const { 639 return OwningObject; 640 } 641 642 } // end namespace object 643 644 template <> struct DenseMapInfo<object::SectionRef> { 645 static bool isEqual(const object::SectionRef &A, 646 const object::SectionRef &B) { 647 return A == B; 648 } 649 static object::SectionRef getEmptyKey() { 650 return object::SectionRef({}, nullptr); 651 } 652 static object::SectionRef getTombstoneKey() { 653 object::DataRefImpl TS; 654 TS.p = (uintptr_t)-1; 655 return object::SectionRef(TS, nullptr); 656 } 657 static unsigned getHashValue(const object::SectionRef &Sec) { 658 object::DataRefImpl Raw = Sec.getRawDataRefImpl(); 659 return hash_combine(Raw.p, Raw.d.a, Raw.d.b); 660 } 661 }; 662 663 } // end namespace llvm 664 665 #endif // LLVM_OBJECT_OBJECTFILE_H 666