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
33namespace llvm {
34
35class SubtargetFeatures;
36
37namespace object {
38
39class COFFObjectFile;
40class MachOObjectFile;
41class ObjectFile;
42class SectionRef;
43class SymbolRef;
44class symbol_iterator;
45class WasmObjectFile;
46
47using section_iterator = content_iterator<SectionRef>;
48
49typedef 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.
52class RelocationRef {
53 DataRefImpl RelocationPimpl;
54 const ObjectFile *OwningObject = nullptr;
55
56public:
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
77using 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.
81class SectionRef {
82 friend class SymbolRef;
83
84 DataRefImpl SectionPimpl;
85 const ObjectFile *OwningObject = nullptr;
86
87public:
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(x: relocation_begin(), y: 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
145struct SectionedAddress {
146 const static uint64_t UndefSection = UINT64_MAX;
147
148 uint64_t Address = 0;
149 uint64_t SectionIndex = UndefSection;
150};
151
152inline bool operator<(const SectionedAddress &LHS,
153 const SectionedAddress &RHS) {
154 return std::tie(args: LHS.SectionIndex, args: LHS.Address) <
155 std::tie(args: RHS.SectionIndex, args: RHS.Address);
156}
157
158inline bool operator==(const SectionedAddress &LHS,
159 const SectionedAddress &RHS) {
160 return std::tie(args: LHS.SectionIndex, args: LHS.Address) ==
161 std::tie(args: RHS.SectionIndex, args: RHS.Address);
162}
163
164raw_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.
168class SymbolRef : public BasicSymbolRef {
169 friend class SectionRef;
170
171public:
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
208class symbol_iterator : public basic_symbol_iterator {
209public:
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>(Val: 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.
229class ObjectFile : public SymbolicFile {
230 virtual void anchor();
231
232protected:
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
302public:
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(Err: 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 Triple::OSType getOS() const { return Triple::UnknownOS; }
341 virtual Expected<SubtargetFeatures> getFeatures() const = 0;
342 virtual std::optional<StringRef> tryGetCPUName() const {
343 return std::nullopt;
344 };
345 virtual void setARMSubArch(Triple &TheTriple) const { }
346 virtual Expected<uint64_t> getStartAddress() const {
347 return errorCodeToError(EC: object_error::parse_failed);
348 };
349
350 /// Create a triple from the data in this object file.
351 Triple makeTriple() const;
352
353 /// Maps a debug section name to a standard DWARF section name.
354 virtual StringRef mapDebugSectionName(StringRef Name) const { return Name; }
355
356 /// True if this is a relocatable object (.o/.obj).
357 virtual bool isRelocatableObject() const = 0;
358
359 /// True if the reflection section can be stripped by the linker.
360 bool isReflectionSectionStrippable(
361 llvm::binaryformat::Swift5ReflectionSectionKind ReflectionSectionKind)
362 const;
363
364 /// @returns Pointer to ObjectFile subclass to handle this type of object.
365 /// @param ObjectPath The path to the object file. ObjectPath.isObject must
366 /// return true.
367 /// Create ObjectFile from path.
368 static Expected<OwningBinary<ObjectFile>>
369 createObjectFile(StringRef ObjectPath);
370
371 static Expected<std::unique_ptr<ObjectFile>>
372 createObjectFile(MemoryBufferRef Object, llvm::file_magic Type,
373 bool InitContent = true);
374 static Expected<std::unique_ptr<ObjectFile>>
375 createObjectFile(MemoryBufferRef Object) {
376 return createObjectFile(Object, Type: llvm::file_magic::unknown);
377 }
378
379 static bool classof(const Binary *v) {
380 return v->isObject();
381 }
382
383 static Expected<std::unique_ptr<COFFObjectFile>>
384 createCOFFObjectFile(MemoryBufferRef Object);
385
386 static Expected<std::unique_ptr<ObjectFile>>
387 createXCOFFObjectFile(MemoryBufferRef Object, unsigned FileType);
388
389 static Expected<std::unique_ptr<ObjectFile>>
390 createELFObjectFile(MemoryBufferRef Object, bool InitContent = true);
391
392 static Expected<std::unique_ptr<MachOObjectFile>>
393 createMachOObjectFile(MemoryBufferRef Object, uint32_t UniversalCputype = 0,
394 uint32_t UniversalIndex = 0,
395 size_t MachOFilesetEntryOffset = 0);
396
397 static Expected<std::unique_ptr<ObjectFile>>
398 createGOFFObjectFile(MemoryBufferRef Object);
399
400 static Expected<std::unique_ptr<WasmObjectFile>>
401 createWasmObjectFile(MemoryBufferRef Object);
402};
403
404/// A filtered iterator for SectionRefs that skips sections based on some given
405/// predicate.
406class SectionFilterIterator {
407public:
408 SectionFilterIterator(SectionFilterPredicate Pred,
409 const section_iterator &Begin,
410 const section_iterator &End)
411 : Predicate(std::move(Pred)), Iterator(Begin), End(End) {
412 scanPredicate();
413 }
414 const SectionRef &operator*() const { return *Iterator; }
415 SectionFilterIterator &operator++() {
416 ++Iterator;
417 scanPredicate();
418 return *this;
419 }
420 bool operator!=(const SectionFilterIterator &Other) const {
421 return Iterator != Other.Iterator;
422 }
423
424private:
425 void scanPredicate() {
426 while (Iterator != End && !Predicate(*Iterator)) {
427 ++Iterator;
428 }
429 }
430 SectionFilterPredicate Predicate;
431 section_iterator Iterator;
432 section_iterator End;
433};
434
435/// Creates an iterator range of SectionFilterIterators for a given Object and
436/// predicate.
437class SectionFilter {
438public:
439 SectionFilter(SectionFilterPredicate Pred, const ObjectFile &Obj)
440 : Predicate(std::move(Pred)), Object(Obj) {}
441 SectionFilterIterator begin() {
442 return SectionFilterIterator(Predicate, Object.section_begin(),
443 Object.section_end());
444 }
445 SectionFilterIterator end() {
446 return SectionFilterIterator(Predicate, Object.section_end(),
447 Object.section_end());
448 }
449
450private:
451 SectionFilterPredicate Predicate;
452 const ObjectFile &Object;
453};
454
455// Inline function definitions.
456inline SymbolRef::SymbolRef(DataRefImpl SymbolP, const ObjectFile *Owner)
457 : BasicSymbolRef(SymbolP, Owner) {}
458
459inline Expected<StringRef> SymbolRef::getName() const {
460 return getObject()->getSymbolName(Symb: getRawDataRefImpl());
461}
462
463inline Expected<uint64_t> SymbolRef::getAddress() const {
464 return getObject()->getSymbolAddress(Symb: getRawDataRefImpl());
465}
466
467inline Expected<uint64_t> SymbolRef::getValue() const {
468 return getObject()->getSymbolValue(Symb: getRawDataRefImpl());
469}
470
471inline uint32_t SymbolRef::getAlignment() const {
472 return getObject()->getSymbolAlignment(Symb: getRawDataRefImpl());
473}
474
475inline uint64_t SymbolRef::getCommonSize() const {
476 return getObject()->getCommonSymbolSize(Symb: getRawDataRefImpl());
477}
478
479inline Expected<section_iterator> SymbolRef::getSection() const {
480 return getObject()->getSymbolSection(Symb: getRawDataRefImpl());
481}
482
483inline Expected<SymbolRef::Type> SymbolRef::getType() const {
484 return getObject()->getSymbolType(Symb: getRawDataRefImpl());
485}
486
487inline const ObjectFile *SymbolRef::getObject() const {
488 const SymbolicFile *O = BasicSymbolRef::getObject();
489 return cast<ObjectFile>(Val: O);
490}
491
492/// SectionRef
493inline SectionRef::SectionRef(DataRefImpl SectionP,
494 const ObjectFile *Owner)
495 : SectionPimpl(SectionP)
496 , OwningObject(Owner) {}
497
498inline bool SectionRef::operator==(const SectionRef &Other) const {
499 return OwningObject == Other.OwningObject &&
500 SectionPimpl == Other.SectionPimpl;
501}
502
503inline bool SectionRef::operator!=(const SectionRef &Other) const {
504 return !(*this == Other);
505}
506
507inline bool SectionRef::operator<(const SectionRef &Other) const {
508 assert(OwningObject == Other.OwningObject);
509 return SectionPimpl < Other.SectionPimpl;
510}
511
512inline void SectionRef::moveNext() {
513 return OwningObject->moveSectionNext(Sec&: SectionPimpl);
514}
515
516inline Expected<StringRef> SectionRef::getName() const {
517 return OwningObject->getSectionName(Sec: SectionPimpl);
518}
519
520inline uint64_t SectionRef::getAddress() const {
521 return OwningObject->getSectionAddress(Sec: SectionPimpl);
522}
523
524inline uint64_t SectionRef::getIndex() const {
525 return OwningObject->getSectionIndex(Sec: SectionPimpl);
526}
527
528inline uint64_t SectionRef::getSize() const {
529 return OwningObject->getSectionSize(Sec: SectionPimpl);
530}
531
532inline Expected<StringRef> SectionRef::getContents() const {
533 Expected<ArrayRef<uint8_t>> Res =
534 OwningObject->getSectionContents(Sec: SectionPimpl);
535 if (!Res)
536 return Res.takeError();
537 return StringRef(reinterpret_cast<const char *>(Res->data()), Res->size());
538}
539
540inline Align SectionRef::getAlignment() const {
541 return MaybeAlign(OwningObject->getSectionAlignment(Sec: SectionPimpl))
542 .valueOrOne();
543}
544
545inline bool SectionRef::isCompressed() const {
546 return OwningObject->isSectionCompressed(Sec: SectionPimpl);
547}
548
549inline bool SectionRef::isText() const {
550 return OwningObject->isSectionText(Sec: SectionPimpl);
551}
552
553inline bool SectionRef::isData() const {
554 return OwningObject->isSectionData(Sec: SectionPimpl);
555}
556
557inline bool SectionRef::isBSS() const {
558 return OwningObject->isSectionBSS(Sec: SectionPimpl);
559}
560
561inline bool SectionRef::isVirtual() const {
562 return OwningObject->isSectionVirtual(Sec: SectionPimpl);
563}
564
565inline bool SectionRef::isBitcode() const {
566 return OwningObject->isSectionBitcode(Sec: SectionPimpl);
567}
568
569inline bool SectionRef::isStripped() const {
570 return OwningObject->isSectionStripped(Sec: SectionPimpl);
571}
572
573inline bool SectionRef::isBerkeleyText() const {
574 return OwningObject->isBerkeleyText(Sec: SectionPimpl);
575}
576
577inline bool SectionRef::isBerkeleyData() const {
578 return OwningObject->isBerkeleyData(Sec: SectionPimpl);
579}
580
581inline bool SectionRef::isDebugSection() const {
582 return OwningObject->isDebugSection(Sec: SectionPimpl);
583}
584
585inline relocation_iterator SectionRef::relocation_begin() const {
586 return OwningObject->section_rel_begin(Sec: SectionPimpl);
587}
588
589inline relocation_iterator SectionRef::relocation_end() const {
590 return OwningObject->section_rel_end(Sec: SectionPimpl);
591}
592
593inline Expected<section_iterator> SectionRef::getRelocatedSection() const {
594 return OwningObject->getRelocatedSection(Sec: SectionPimpl);
595}
596
597inline DataRefImpl SectionRef::getRawDataRefImpl() const {
598 return SectionPimpl;
599}
600
601inline const ObjectFile *SectionRef::getObject() const {
602 return OwningObject;
603}
604
605/// RelocationRef
606inline RelocationRef::RelocationRef(DataRefImpl RelocationP,
607 const ObjectFile *Owner)
608 : RelocationPimpl(RelocationP)
609 , OwningObject(Owner) {}
610
611inline bool RelocationRef::operator==(const RelocationRef &Other) const {
612 return RelocationPimpl == Other.RelocationPimpl;
613}
614
615inline void RelocationRef::moveNext() {
616 return OwningObject->moveRelocationNext(Rel&: RelocationPimpl);
617}
618
619inline uint64_t RelocationRef::getOffset() const {
620 return OwningObject->getRelocationOffset(Rel: RelocationPimpl);
621}
622
623inline symbol_iterator RelocationRef::getSymbol() const {
624 return OwningObject->getRelocationSymbol(Rel: RelocationPimpl);
625}
626
627inline uint64_t RelocationRef::getType() const {
628 return OwningObject->getRelocationType(Rel: RelocationPimpl);
629}
630
631inline void RelocationRef::getTypeName(SmallVectorImpl<char> &Result) const {
632 return OwningObject->getRelocationTypeName(Rel: RelocationPimpl, Result);
633}
634
635inline DataRefImpl RelocationRef::getRawDataRefImpl() const {
636 return RelocationPimpl;
637}
638
639inline const ObjectFile *RelocationRef::getObject() const {
640 return OwningObject;
641}
642
643} // end namespace object
644
645template <> struct DenseMapInfo<object::SectionRef> {
646 static bool isEqual(const object::SectionRef &A,
647 const object::SectionRef &B) {
648 return A == B;
649 }
650 static object::SectionRef getEmptyKey() {
651 return object::SectionRef({}, nullptr);
652 }
653 static object::SectionRef getTombstoneKey() {
654 object::DataRefImpl TS;
655 TS.p = (uintptr_t)-1;
656 return object::SectionRef(TS, nullptr);
657 }
658 static unsigned getHashValue(const object::SectionRef &Sec) {
659 object::DataRefImpl Raw = Sec.getRawDataRefImpl();
660 return hash_combine(args: Raw.p, args: Raw.d.a, args: Raw.d.b);
661 }
662};
663
664} // end namespace llvm
665
666#endif // LLVM_OBJECT_OBJECTFILE_H
667

source code of llvm/include/llvm/Object/ObjectFile.h