1 //===- ELFObjectFile.h - ELF object file implementation ---------*- 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 the ELFObjectFile template class.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #ifndef LLVM_OBJECT_ELFOBJECTFILE_H
14 #define LLVM_OBJECT_ELFOBJECTFILE_H
15 
16 #include "llvm/ADT/ArrayRef.h"
17 #include "llvm/ADT/STLExtras.h"
18 #include "llvm/ADT/SmallVector.h"
19 #include "llvm/ADT/StringRef.h"
20 #include "llvm/ADT/Triple.h"
21 #include "llvm/ADT/iterator_range.h"
22 #include "llvm/BinaryFormat/ELF.h"
23 #include "llvm/MC/SubtargetFeature.h"
24 #include "llvm/Object/Binary.h"
25 #include "llvm/Object/ELF.h"
26 #include "llvm/Object/ELFTypes.h"
27 #include "llvm/Object/Error.h"
28 #include "llvm/Object/ObjectFile.h"
29 #include "llvm/Object/SymbolicFile.h"
30 #include "llvm/Support/ARMAttributeParser.h"
31 #include "llvm/Support/ARMBuildAttributes.h"
32 #include "llvm/Support/Casting.h"
33 #include "llvm/Support/Endian.h"
34 #include "llvm/Support/Error.h"
35 #include "llvm/Support/ErrorHandling.h"
36 #include "llvm/Support/MemoryBuffer.h"
37 #include <cassert>
38 #include <cstdint>
39 #include <system_error>
40 
41 namespace llvm {
42 namespace object {
43 
44 constexpr int NumElfSymbolTypes = 8;
45 extern const llvm::EnumEntry<unsigned> ElfSymbolTypes[NumElfSymbolTypes];
46 
47 class elf_symbol_iterator;
48 
49 class ELFObjectFileBase : public ObjectFile {
50   friend class ELFRelocationRef;
51   friend class ELFSectionRef;
52   friend class ELFSymbolRef;
53 
54 protected:
55   ELFObjectFileBase(unsigned int Type, MemoryBufferRef Source);
56 
57   virtual uint64_t getSymbolSize(DataRefImpl Symb) const = 0;
58   virtual uint8_t getSymbolBinding(DataRefImpl Symb) const = 0;
59   virtual uint8_t getSymbolOther(DataRefImpl Symb) const = 0;
60   virtual uint8_t getSymbolELFType(DataRefImpl Symb) const = 0;
61 
62   virtual uint32_t getSectionType(DataRefImpl Sec) const = 0;
63   virtual uint64_t getSectionFlags(DataRefImpl Sec) const = 0;
64   virtual uint64_t getSectionOffset(DataRefImpl Sec) const = 0;
65 
66   virtual Expected<int64_t> getRelocationAddend(DataRefImpl Rel) const = 0;
67   virtual Error getBuildAttributes(ARMAttributeParser &Attributes) const = 0;
68 
69 public:
70   using elf_symbol_iterator_range = iterator_range<elf_symbol_iterator>;
71 
72   virtual elf_symbol_iterator_range getDynamicSymbolIterators() const = 0;
73 
74   /// Returns platform-specific object flags, if any.
75   virtual unsigned getPlatformFlags() const = 0;
76 
77   elf_symbol_iterator_range symbols() const;
78 
79   static bool classof(const Binary *v) { return v->isELF(); }
80 
81   SubtargetFeatures getFeatures() const override;
82 
83   SubtargetFeatures getMIPSFeatures() const;
84 
85   SubtargetFeatures getARMFeatures() const;
86 
87   SubtargetFeatures getRISCVFeatures() const;
88 
89   void setARMSubArch(Triple &TheTriple) const override;
90 
91   virtual uint16_t getEType() const = 0;
92 
93   virtual uint16_t getEMachine() const = 0;
94 
95   std::vector<std::pair<DataRefImpl, uint64_t>> getPltAddresses() const;
96 };
97 
98 class ELFSectionRef : public SectionRef {
99 public:
100   ELFSectionRef(const SectionRef &B) : SectionRef(B) {
101     assert(isa<ELFObjectFileBase>(SectionRef::getObject()));
102   }
103 
104   const ELFObjectFileBase *getObject() const {
105     return cast<ELFObjectFileBase>(SectionRef::getObject());
106   }
107 
108   uint32_t getType() const {
109     return getObject()->getSectionType(getRawDataRefImpl());
110   }
111 
112   uint64_t getFlags() const {
113     return getObject()->getSectionFlags(getRawDataRefImpl());
114   }
115 
116   uint64_t getOffset() const {
117     return getObject()->getSectionOffset(getRawDataRefImpl());
118   }
119 };
120 
121 class elf_section_iterator : public section_iterator {
122 public:
123   elf_section_iterator(const section_iterator &B) : section_iterator(B) {
124     assert(isa<ELFObjectFileBase>(B->getObject()));
125   }
126 
127   const ELFSectionRef *operator->() const {
128     return static_cast<const ELFSectionRef *>(section_iterator::operator->());
129   }
130 
131   const ELFSectionRef &operator*() const {
132     return static_cast<const ELFSectionRef &>(section_iterator::operator*());
133   }
134 };
135 
136 class ELFSymbolRef : public SymbolRef {
137 public:
138   ELFSymbolRef(const SymbolRef &B) : SymbolRef(B) {
139     assert(isa<ELFObjectFileBase>(SymbolRef::getObject()));
140   }
141 
142   const ELFObjectFileBase *getObject() const {
143     return cast<ELFObjectFileBase>(BasicSymbolRef::getObject());
144   }
145 
146   uint64_t getSize() const {
147     return getObject()->getSymbolSize(getRawDataRefImpl());
148   }
149 
150   uint8_t getBinding() const {
151     return getObject()->getSymbolBinding(getRawDataRefImpl());
152   }
153 
154   uint8_t getOther() const {
155     return getObject()->getSymbolOther(getRawDataRefImpl());
156   }
157 
158   uint8_t getELFType() const {
159     return getObject()->getSymbolELFType(getRawDataRefImpl());
160   }
161 
162   StringRef getELFTypeName() const {
163     uint8_t Type = getELFType();
164     for (auto &EE : ElfSymbolTypes) {
165       if (EE.Value == Type) {
166         return EE.AltName;
167       }
168     }
169     return "";
170   }
171 };
172 
173 class elf_symbol_iterator : public symbol_iterator {
174 public:
175   elf_symbol_iterator(const basic_symbol_iterator &B)
176       : symbol_iterator(SymbolRef(B->getRawDataRefImpl(),
177                                   cast<ELFObjectFileBase>(B->getObject()))) {}
178 
179   const ELFSymbolRef *operator->() const {
180     return static_cast<const ELFSymbolRef *>(symbol_iterator::operator->());
181   }
182 
183   const ELFSymbolRef &operator*() const {
184     return static_cast<const ELFSymbolRef &>(symbol_iterator::operator*());
185   }
186 };
187 
188 class ELFRelocationRef : public RelocationRef {
189 public:
190   ELFRelocationRef(const RelocationRef &B) : RelocationRef(B) {
191     assert(isa<ELFObjectFileBase>(RelocationRef::getObject()));
192   }
193 
194   const ELFObjectFileBase *getObject() const {
195     return cast<ELFObjectFileBase>(RelocationRef::getObject());
196   }
197 
198   Expected<int64_t> getAddend() const {
199     return getObject()->getRelocationAddend(getRawDataRefImpl());
200   }
201 };
202 
203 class elf_relocation_iterator : public relocation_iterator {
204 public:
205   elf_relocation_iterator(const relocation_iterator &B)
206       : relocation_iterator(RelocationRef(
207             B->getRawDataRefImpl(), cast<ELFObjectFileBase>(B->getObject()))) {}
208 
209   const ELFRelocationRef *operator->() const {
210     return static_cast<const ELFRelocationRef *>(
211         relocation_iterator::operator->());
212   }
213 
214   const ELFRelocationRef &operator*() const {
215     return static_cast<const ELFRelocationRef &>(
216         relocation_iterator::operator*());
217   }
218 };
219 
220 inline ELFObjectFileBase::elf_symbol_iterator_range
221 ELFObjectFileBase::symbols() const {
222   return elf_symbol_iterator_range(symbol_begin(), symbol_end());
223 }
224 
225 template <class ELFT> class ELFObjectFile : public ELFObjectFileBase {
226   uint16_t getEMachine() const override;
227   uint16_t getEType() const override;
228   uint64_t getSymbolSize(DataRefImpl Sym) const override;
229 
230 public:
231   LLVM_ELF_IMPORT_TYPES_ELFT(ELFT)
232 
233   using uintX_t = typename ELFT::uint;
234 
235   using Elf_Sym = typename ELFT::Sym;
236   using Elf_Shdr = typename ELFT::Shdr;
237   using Elf_Ehdr = typename ELFT::Ehdr;
238   using Elf_Rel = typename ELFT::Rel;
239   using Elf_Rela = typename ELFT::Rela;
240   using Elf_Dyn = typename ELFT::Dyn;
241 
242 private:
243   ELFObjectFile(MemoryBufferRef Object, ELFFile<ELFT> EF,
244                 const Elf_Shdr *DotDynSymSec, const Elf_Shdr *DotSymtabSec,
245                 ArrayRef<Elf_Word> ShndxTable);
246 
247 protected:
248   ELFFile<ELFT> EF;
249 
250   const Elf_Shdr *DotDynSymSec = nullptr; // Dynamic symbol table section.
251   const Elf_Shdr *DotSymtabSec = nullptr; // Symbol table section.
252   ArrayRef<Elf_Word> ShndxTable;
253 
254   void moveSymbolNext(DataRefImpl &Symb) const override;
255   Expected<StringRef> getSymbolName(DataRefImpl Symb) const override;
256   Expected<uint64_t> getSymbolAddress(DataRefImpl Symb) const override;
257   uint64_t getSymbolValueImpl(DataRefImpl Symb) const override;
258   uint32_t getSymbolAlignment(DataRefImpl Symb) const override;
259   uint64_t getCommonSymbolSizeImpl(DataRefImpl Symb) const override;
260   uint32_t getSymbolFlags(DataRefImpl Symb) const override;
261   uint8_t getSymbolBinding(DataRefImpl Symb) const override;
262   uint8_t getSymbolOther(DataRefImpl Symb) const override;
263   uint8_t getSymbolELFType(DataRefImpl Symb) const override;
264   Expected<SymbolRef::Type> getSymbolType(DataRefImpl Symb) const override;
265   Expected<section_iterator> getSymbolSection(const Elf_Sym *Symb,
266                                               const Elf_Shdr *SymTab) const;
267   Expected<section_iterator> getSymbolSection(DataRefImpl Symb) const override;
268 
269   void moveSectionNext(DataRefImpl &Sec) const override;
270   Expected<StringRef> getSectionName(DataRefImpl Sec) const override;
271   uint64_t getSectionAddress(DataRefImpl Sec) const override;
272   uint64_t getSectionIndex(DataRefImpl Sec) const override;
273   uint64_t getSectionSize(DataRefImpl Sec) const override;
274   Expected<ArrayRef<uint8_t>>
275   getSectionContents(DataRefImpl Sec) const override;
276   uint64_t getSectionAlignment(DataRefImpl Sec) const override;
277   bool isSectionCompressed(DataRefImpl Sec) const override;
278   bool isSectionText(DataRefImpl Sec) const override;
279   bool isSectionData(DataRefImpl Sec) const override;
280   bool isSectionBSS(DataRefImpl Sec) const override;
281   bool isSectionVirtual(DataRefImpl Sec) const override;
282   bool isBerkeleyText(DataRefImpl Sec) const override;
283   bool isBerkeleyData(DataRefImpl Sec) const override;
284   relocation_iterator section_rel_begin(DataRefImpl Sec) const override;
285   relocation_iterator section_rel_end(DataRefImpl Sec) const override;
286   std::vector<SectionRef> dynamic_relocation_sections() const override;
287   section_iterator getRelocatedSection(DataRefImpl Sec) const override;
288 
289   void moveRelocationNext(DataRefImpl &Rel) const override;
290   uint64_t getRelocationOffset(DataRefImpl Rel) const override;
291   symbol_iterator getRelocationSymbol(DataRefImpl Rel) const override;
292   uint64_t getRelocationType(DataRefImpl Rel) const override;
293   void getRelocationTypeName(DataRefImpl Rel,
294                              SmallVectorImpl<char> &Result) const override;
295 
296   uint32_t getSectionType(DataRefImpl Sec) const override;
297   uint64_t getSectionFlags(DataRefImpl Sec) const override;
298   uint64_t getSectionOffset(DataRefImpl Sec) const override;
299   StringRef getRelocationTypeName(uint32_t Type) const;
300 
301   /// Get the relocation section that contains \a Rel.
302   const Elf_Shdr *getRelSection(DataRefImpl Rel) const {
303     auto RelSecOrErr = EF.getSection(Rel.d.a);
304     if (!RelSecOrErr)
305       report_fatal_error(errorToErrorCode(RelSecOrErr.takeError()).message());
306     return *RelSecOrErr;
307   }
308 
309   DataRefImpl toDRI(const Elf_Shdr *SymTable, unsigned SymbolNum) const {
310     DataRefImpl DRI;
311     if (!SymTable) {
312       DRI.d.a = 0;
313       DRI.d.b = 0;
314       return DRI;
315     }
316     assert(SymTable->sh_type == ELF::SHT_SYMTAB ||
317            SymTable->sh_type == ELF::SHT_DYNSYM);
318 
319     auto SectionsOrErr = EF.sections();
320     if (!SectionsOrErr) {
321       DRI.d.a = 0;
322       DRI.d.b = 0;
323       return DRI;
324     }
325     uintptr_t SHT = reinterpret_cast<uintptr_t>((*SectionsOrErr).begin());
326     unsigned SymTableIndex =
327         (reinterpret_cast<uintptr_t>(SymTable) - SHT) / sizeof(Elf_Shdr);
328 
329     DRI.d.a = SymTableIndex;
330     DRI.d.b = SymbolNum;
331     return DRI;
332   }
333 
334   const Elf_Shdr *toELFShdrIter(DataRefImpl Sec) const {
335     return reinterpret_cast<const Elf_Shdr *>(Sec.p);
336   }
337 
338   DataRefImpl toDRI(const Elf_Shdr *Sec) const {
339     DataRefImpl DRI;
340     DRI.p = reinterpret_cast<uintptr_t>(Sec);
341     return DRI;
342   }
343 
344   DataRefImpl toDRI(const Elf_Dyn *Dyn) const {
345     DataRefImpl DRI;
346     DRI.p = reinterpret_cast<uintptr_t>(Dyn);
347     return DRI;
348   }
349 
350   bool isExportedToOtherDSO(const Elf_Sym *ESym) const {
351     unsigned char Binding = ESym->getBinding();
352     unsigned char Visibility = ESym->getVisibility();
353 
354     // A symbol is exported if its binding is either GLOBAL or WEAK, and its
355     // visibility is either DEFAULT or PROTECTED. All other symbols are not
356     // exported.
357     return (
358         (Binding == ELF::STB_GLOBAL || Binding == ELF::STB_WEAK ||
359          Binding == ELF::STB_GNU_UNIQUE) &&
360         (Visibility == ELF::STV_DEFAULT || Visibility == ELF::STV_PROTECTED));
361   }
362 
363   Error getBuildAttributes(ARMAttributeParser &Attributes) const override {
364     auto SectionsOrErr = EF.sections();
365     if (!SectionsOrErr)
366       return SectionsOrErr.takeError();
367 
368     for (const Elf_Shdr &Sec : *SectionsOrErr) {
369       if (Sec.sh_type == ELF::SHT_ARM_ATTRIBUTES) {
370         auto ErrorOrContents = EF.getSectionContents(&Sec);
371         if (!ErrorOrContents)
372           return ErrorOrContents.takeError();
373 
374         auto Contents = ErrorOrContents.get();
375         if (Contents[0] != ARMBuildAttrs::Format_Version || Contents.size() == 1)
376           return Error::success();
377 
378         Attributes.Parse(Contents, ELFT::TargetEndianness == support::little);
379         break;
380       }
381     }
382     return Error::success();
383   }
384 
385   // This flag is used for classof, to distinguish ELFObjectFile from
386   // its subclass. If more subclasses will be created, this flag will
387   // have to become an enum.
388   bool isDyldELFObject;
389 
390 public:
391   ELFObjectFile(ELFObjectFile<ELFT> &&Other);
392   static Expected<ELFObjectFile<ELFT>> create(MemoryBufferRef Object);
393 
394   const Elf_Rel *getRel(DataRefImpl Rel) const;
395   const Elf_Rela *getRela(DataRefImpl Rela) const;
396 
397   const Elf_Sym *getSymbol(DataRefImpl Sym) const {
398     auto Ret = EF.template getEntry<Elf_Sym>(Sym.d.a, Sym.d.b);
399     if (!Ret)
400       report_fatal_error(errorToErrorCode(Ret.takeError()).message());
401     return *Ret;
402   }
403 
404   const Elf_Shdr *getSection(DataRefImpl Sec) const {
405     return reinterpret_cast<const Elf_Shdr *>(Sec.p);
406   }
407 
408   basic_symbol_iterator symbol_begin() const override;
409   basic_symbol_iterator symbol_end() const override;
410 
411   elf_symbol_iterator dynamic_symbol_begin() const;
412   elf_symbol_iterator dynamic_symbol_end() const;
413 
414   section_iterator section_begin() const override;
415   section_iterator section_end() const override;
416 
417   Expected<int64_t> getRelocationAddend(DataRefImpl Rel) const override;
418 
419   uint8_t getBytesInAddress() const override;
420   StringRef getFileFormatName() const override;
421   Triple::ArchType getArch() const override;
422   Expected<uint64_t> getStartAddress() const override;
423 
424   unsigned getPlatformFlags() const override { return EF.getHeader()->e_flags; }
425 
426   const ELFFile<ELFT> *getELFFile() const { return &EF; }
427 
428   bool isDyldType() const { return isDyldELFObject; }
429   static bool classof(const Binary *v) {
430     return v->getType() == getELFType(ELFT::TargetEndianness == support::little,
431                                       ELFT::Is64Bits);
432   }
433 
434   elf_symbol_iterator_range getDynamicSymbolIterators() const override;
435 
436   bool isRelocatableObject() const override;
437 };
438 
439 using ELF32LEObjectFile = ELFObjectFile<ELF32LE>;
440 using ELF64LEObjectFile = ELFObjectFile<ELF64LE>;
441 using ELF32BEObjectFile = ELFObjectFile<ELF32BE>;
442 using ELF64BEObjectFile = ELFObjectFile<ELF64BE>;
443 
444 template <class ELFT>
445 void ELFObjectFile<ELFT>::moveSymbolNext(DataRefImpl &Sym) const {
446   ++Sym.d.b;
447 }
448 
449 template <class ELFT>
450 Expected<StringRef> ELFObjectFile<ELFT>::getSymbolName(DataRefImpl Sym) const {
451   const Elf_Sym *ESym = getSymbol(Sym);
452   auto SymTabOrErr = EF.getSection(Sym.d.a);
453   if (!SymTabOrErr)
454     return SymTabOrErr.takeError();
455   const Elf_Shdr *SymTableSec = *SymTabOrErr;
456   auto StrTabOrErr = EF.getSection(SymTableSec->sh_link);
457   if (!StrTabOrErr)
458     return StrTabOrErr.takeError();
459   const Elf_Shdr *StringTableSec = *StrTabOrErr;
460   auto SymStrTabOrErr = EF.getStringTable(StringTableSec);
461   if (!SymStrTabOrErr)
462     return SymStrTabOrErr.takeError();
463   Expected<StringRef> Name = ESym->getName(*SymStrTabOrErr);
464 
465   // If the symbol name is empty use the section name.
466   if ((!Name || Name->empty()) && ESym->getType() == ELF::STT_SECTION) {
467     StringRef SecName;
468     Expected<section_iterator> Sec = getSymbolSection(Sym);
469     if (Sec && !(*Sec)->getName(SecName))
470       return SecName;
471   }
472   return Name;
473 }
474 
475 template <class ELFT>
476 uint64_t ELFObjectFile<ELFT>::getSectionFlags(DataRefImpl Sec) const {
477   return getSection(Sec)->sh_flags;
478 }
479 
480 template <class ELFT>
481 uint32_t ELFObjectFile<ELFT>::getSectionType(DataRefImpl Sec) const {
482   return getSection(Sec)->sh_type;
483 }
484 
485 template <class ELFT>
486 uint64_t ELFObjectFile<ELFT>::getSectionOffset(DataRefImpl Sec) const {
487   return getSection(Sec)->sh_offset;
488 }
489 
490 template <class ELFT>
491 uint64_t ELFObjectFile<ELFT>::getSymbolValueImpl(DataRefImpl Symb) const {
492   const Elf_Sym *ESym = getSymbol(Symb);
493   uint64_t Ret = ESym->st_value;
494   if (ESym->st_shndx == ELF::SHN_ABS)
495     return Ret;
496 
497   const Elf_Ehdr *Header = EF.getHeader();
498   // Clear the ARM/Thumb or microMIPS indicator flag.
499   if ((Header->e_machine == ELF::EM_ARM || Header->e_machine == ELF::EM_MIPS) &&
500       ESym->getType() == ELF::STT_FUNC)
501     Ret &= ~1;
502 
503   return Ret;
504 }
505 
506 template <class ELFT>
507 Expected<uint64_t>
508 ELFObjectFile<ELFT>::getSymbolAddress(DataRefImpl Symb) const {
509   uint64_t Result = getSymbolValue(Symb);
510   const Elf_Sym *ESym = getSymbol(Symb);
511   switch (ESym->st_shndx) {
512   case ELF::SHN_COMMON:
513   case ELF::SHN_UNDEF:
514   case ELF::SHN_ABS:
515     return Result;
516   }
517 
518   const Elf_Ehdr *Header = EF.getHeader();
519   auto SymTabOrErr = EF.getSection(Symb.d.a);
520   if (!SymTabOrErr)
521     return SymTabOrErr.takeError();
522   const Elf_Shdr *SymTab = *SymTabOrErr;
523 
524   if (Header->e_type == ELF::ET_REL) {
525     auto SectionOrErr = EF.getSection(ESym, SymTab, ShndxTable);
526     if (!SectionOrErr)
527       return SectionOrErr.takeError();
528     const Elf_Shdr *Section = *SectionOrErr;
529     if (Section)
530       Result += Section->sh_addr;
531   }
532 
533   return Result;
534 }
535 
536 template <class ELFT>
537 uint32_t ELFObjectFile<ELFT>::getSymbolAlignment(DataRefImpl Symb) const {
538   const Elf_Sym *Sym = getSymbol(Symb);
539   if (Sym->st_shndx == ELF::SHN_COMMON)
540     return Sym->st_value;
541   return 0;
542 }
543 
544 template <class ELFT>
545 uint16_t ELFObjectFile<ELFT>::getEMachine() const {
546   return EF.getHeader()->e_machine;
547 }
548 
549 template <class ELFT> uint16_t ELFObjectFile<ELFT>::getEType() const {
550   return EF.getHeader()->e_type;
551 }
552 
553 template <class ELFT>
554 uint64_t ELFObjectFile<ELFT>::getSymbolSize(DataRefImpl Sym) const {
555   return getSymbol(Sym)->st_size;
556 }
557 
558 template <class ELFT>
559 uint64_t ELFObjectFile<ELFT>::getCommonSymbolSizeImpl(DataRefImpl Symb) const {
560   return getSymbol(Symb)->st_size;
561 }
562 
563 template <class ELFT>
564 uint8_t ELFObjectFile<ELFT>::getSymbolBinding(DataRefImpl Symb) const {
565   return getSymbol(Symb)->getBinding();
566 }
567 
568 template <class ELFT>
569 uint8_t ELFObjectFile<ELFT>::getSymbolOther(DataRefImpl Symb) const {
570   return getSymbol(Symb)->st_other;
571 }
572 
573 template <class ELFT>
574 uint8_t ELFObjectFile<ELFT>::getSymbolELFType(DataRefImpl Symb) const {
575   return getSymbol(Symb)->getType();
576 }
577 
578 template <class ELFT>
579 Expected<SymbolRef::Type>
580 ELFObjectFile<ELFT>::getSymbolType(DataRefImpl Symb) const {
581   const Elf_Sym *ESym = getSymbol(Symb);
582 
583   switch (ESym->getType()) {
584   case ELF::STT_NOTYPE:
585     return SymbolRef::ST_Unknown;
586   case ELF::STT_SECTION:
587     return SymbolRef::ST_Debug;
588   case ELF::STT_FILE:
589     return SymbolRef::ST_File;
590   case ELF::STT_FUNC:
591     return SymbolRef::ST_Function;
592   case ELF::STT_OBJECT:
593   case ELF::STT_COMMON:
594   case ELF::STT_TLS:
595     return SymbolRef::ST_Data;
596   default:
597     return SymbolRef::ST_Other;
598   }
599 }
600 
601 template <class ELFT>
602 uint32_t ELFObjectFile<ELFT>::getSymbolFlags(DataRefImpl Sym) const {
603   const Elf_Sym *ESym = getSymbol(Sym);
604 
605   uint32_t Result = SymbolRef::SF_None;
606 
607   if (ESym->getBinding() != ELF::STB_LOCAL)
608     Result |= SymbolRef::SF_Global;
609 
610   if (ESym->getBinding() == ELF::STB_WEAK)
611     Result |= SymbolRef::SF_Weak;
612 
613   if (ESym->st_shndx == ELF::SHN_ABS)
614     Result |= SymbolRef::SF_Absolute;
615 
616   if (ESym->getType() == ELF::STT_FILE || ESym->getType() == ELF::STT_SECTION)
617     Result |= SymbolRef::SF_FormatSpecific;
618 
619   auto DotSymtabSecSyms = EF.symbols(DotSymtabSec);
620   if (DotSymtabSecSyms && ESym == (*DotSymtabSecSyms).begin())
621     Result |= SymbolRef::SF_FormatSpecific;
622   auto DotDynSymSecSyms = EF.symbols(DotDynSymSec);
623   if (DotDynSymSecSyms && ESym == (*DotDynSymSecSyms).begin())
624     Result |= SymbolRef::SF_FormatSpecific;
625 
626   if (EF.getHeader()->e_machine == ELF::EM_ARM) {
627     if (Expected<StringRef> NameOrErr = getSymbolName(Sym)) {
628       StringRef Name = *NameOrErr;
629       if (Name.startswith("$d") || Name.startswith("$t") ||
630           Name.startswith("$a"))
631         Result |= SymbolRef::SF_FormatSpecific;
632     } else {
633       // TODO: Actually report errors helpfully.
634       consumeError(NameOrErr.takeError());
635     }
636     if (ESym->getType() == ELF::STT_FUNC && (ESym->st_value & 1) == 1)
637       Result |= SymbolRef::SF_Thumb;
638   }
639 
640   if (ESym->st_shndx == ELF::SHN_UNDEF)
641     Result |= SymbolRef::SF_Undefined;
642 
643   if (ESym->getType() == ELF::STT_COMMON || ESym->st_shndx == ELF::SHN_COMMON)
644     Result |= SymbolRef::SF_Common;
645 
646   if (isExportedToOtherDSO(ESym))
647     Result |= SymbolRef::SF_Exported;
648 
649   if (ESym->getVisibility() == ELF::STV_HIDDEN)
650     Result |= SymbolRef::SF_Hidden;
651 
652   return Result;
653 }
654 
655 template <class ELFT>
656 Expected<section_iterator>
657 ELFObjectFile<ELFT>::getSymbolSection(const Elf_Sym *ESym,
658                                       const Elf_Shdr *SymTab) const {
659   auto ESecOrErr = EF.getSection(ESym, SymTab, ShndxTable);
660   if (!ESecOrErr)
661     return ESecOrErr.takeError();
662 
663   const Elf_Shdr *ESec = *ESecOrErr;
664   if (!ESec)
665     return section_end();
666 
667   DataRefImpl Sec;
668   Sec.p = reinterpret_cast<intptr_t>(ESec);
669   return section_iterator(SectionRef(Sec, this));
670 }
671 
672 template <class ELFT>
673 Expected<section_iterator>
674 ELFObjectFile<ELFT>::getSymbolSection(DataRefImpl Symb) const {
675   const Elf_Sym *Sym = getSymbol(Symb);
676   auto SymTabOrErr = EF.getSection(Symb.d.a);
677   if (!SymTabOrErr)
678     return SymTabOrErr.takeError();
679   const Elf_Shdr *SymTab = *SymTabOrErr;
680   return getSymbolSection(Sym, SymTab);
681 }
682 
683 template <class ELFT>
684 void ELFObjectFile<ELFT>::moveSectionNext(DataRefImpl &Sec) const {
685   const Elf_Shdr *ESec = getSection(Sec);
686   Sec = toDRI(++ESec);
687 }
688 
689 template <class ELFT>
690 Expected<StringRef> ELFObjectFile<ELFT>::getSectionName(DataRefImpl Sec) const {
691   return EF.getSectionName(&*getSection(Sec));
692 }
693 
694 template <class ELFT>
695 uint64_t ELFObjectFile<ELFT>::getSectionAddress(DataRefImpl Sec) const {
696   return getSection(Sec)->sh_addr;
697 }
698 
699 template <class ELFT>
700 uint64_t ELFObjectFile<ELFT>::getSectionIndex(DataRefImpl Sec) const {
701   auto SectionsOrErr = EF.sections();
702   handleAllErrors(std::move(SectionsOrErr.takeError()),
703                   [](const ErrorInfoBase &) {
704                     llvm_unreachable("unable to get section index");
705                   });
706   const Elf_Shdr *First = SectionsOrErr->begin();
707   return getSection(Sec) - First;
708 }
709 
710 template <class ELFT>
711 uint64_t ELFObjectFile<ELFT>::getSectionSize(DataRefImpl Sec) const {
712   return getSection(Sec)->sh_size;
713 }
714 
715 template <class ELFT>
716 Expected<ArrayRef<uint8_t>>
717 ELFObjectFile<ELFT>::getSectionContents(DataRefImpl Sec) const {
718   const Elf_Shdr *EShdr = getSection(Sec);
719   if (std::error_code EC =
720           checkOffset(getMemoryBufferRef(),
721                       (uintptr_t)base() + EShdr->sh_offset, EShdr->sh_size))
722     return errorCodeToError(EC);
723   return makeArrayRef((const uint8_t *)base() + EShdr->sh_offset,
724                       EShdr->sh_size);
725 }
726 
727 template <class ELFT>
728 uint64_t ELFObjectFile<ELFT>::getSectionAlignment(DataRefImpl Sec) const {
729   return getSection(Sec)->sh_addralign;
730 }
731 
732 template <class ELFT>
733 bool ELFObjectFile<ELFT>::isSectionCompressed(DataRefImpl Sec) const {
734   return getSection(Sec)->sh_flags & ELF::SHF_COMPRESSED;
735 }
736 
737 template <class ELFT>
738 bool ELFObjectFile<ELFT>::isSectionText(DataRefImpl Sec) const {
739   return getSection(Sec)->sh_flags & ELF::SHF_EXECINSTR;
740 }
741 
742 template <class ELFT>
743 bool ELFObjectFile<ELFT>::isSectionData(DataRefImpl Sec) const {
744   const Elf_Shdr *EShdr = getSection(Sec);
745   return EShdr->sh_type == ELF::SHT_PROGBITS &&
746          EShdr->sh_flags & ELF::SHF_ALLOC &&
747          !(EShdr->sh_flags & ELF::SHF_EXECINSTR);
748 }
749 
750 template <class ELFT>
751 bool ELFObjectFile<ELFT>::isSectionBSS(DataRefImpl Sec) const {
752   const Elf_Shdr *EShdr = getSection(Sec);
753   return EShdr->sh_flags & (ELF::SHF_ALLOC | ELF::SHF_WRITE) &&
754          EShdr->sh_type == ELF::SHT_NOBITS;
755 }
756 
757 template <class ELFT>
758 std::vector<SectionRef>
759 ELFObjectFile<ELFT>::dynamic_relocation_sections() const {
760   std::vector<SectionRef> Res;
761   std::vector<uintptr_t> Offsets;
762 
763   auto SectionsOrErr = EF.sections();
764   if (!SectionsOrErr)
765     return Res;
766 
767   for (const Elf_Shdr &Sec : *SectionsOrErr) {
768     if (Sec.sh_type != ELF::SHT_DYNAMIC)
769       continue;
770     Elf_Dyn *Dynamic =
771         reinterpret_cast<Elf_Dyn *>((uintptr_t)base() + Sec.sh_offset);
772     for (; Dynamic->d_tag != ELF::DT_NULL; Dynamic++) {
773       if (Dynamic->d_tag == ELF::DT_REL || Dynamic->d_tag == ELF::DT_RELA ||
774           Dynamic->d_tag == ELF::DT_JMPREL) {
775         Offsets.push_back(Dynamic->d_un.d_val);
776       }
777     }
778   }
779   for (const Elf_Shdr &Sec : *SectionsOrErr) {
780     if (is_contained(Offsets, Sec.sh_addr))
781       Res.emplace_back(toDRI(&Sec), this);
782   }
783   return Res;
784 }
785 
786 template <class ELFT>
787 bool ELFObjectFile<ELFT>::isSectionVirtual(DataRefImpl Sec) const {
788   return getSection(Sec)->sh_type == ELF::SHT_NOBITS;
789 }
790 
791 template <class ELFT>
792 bool ELFObjectFile<ELFT>::isBerkeleyText(DataRefImpl Sec) const {
793   return getSection(Sec)->sh_flags & ELF::SHF_ALLOC &&
794          (getSection(Sec)->sh_flags & ELF::SHF_EXECINSTR ||
795           !(getSection(Sec)->sh_flags & ELF::SHF_WRITE));
796 }
797 
798 template <class ELFT>
799 bool ELFObjectFile<ELFT>::isBerkeleyData(DataRefImpl Sec) const {
800   const Elf_Shdr *EShdr = getSection(Sec);
801   return !isBerkeleyText(Sec) && EShdr->sh_type != ELF::SHT_NOBITS &&
802          EShdr->sh_flags & ELF::SHF_ALLOC;
803 }
804 
805 template <class ELFT>
806 relocation_iterator
807 ELFObjectFile<ELFT>::section_rel_begin(DataRefImpl Sec) const {
808   DataRefImpl RelData;
809   auto SectionsOrErr = EF.sections();
810   if (!SectionsOrErr)
811     return relocation_iterator(RelocationRef());
812   uintptr_t SHT = reinterpret_cast<uintptr_t>((*SectionsOrErr).begin());
813   RelData.d.a = (Sec.p - SHT) / EF.getHeader()->e_shentsize;
814   RelData.d.b = 0;
815   return relocation_iterator(RelocationRef(RelData, this));
816 }
817 
818 template <class ELFT>
819 relocation_iterator
820 ELFObjectFile<ELFT>::section_rel_end(DataRefImpl Sec) const {
821   const Elf_Shdr *S = reinterpret_cast<const Elf_Shdr *>(Sec.p);
822   relocation_iterator Begin = section_rel_begin(Sec);
823   if (S->sh_type != ELF::SHT_RELA && S->sh_type != ELF::SHT_REL)
824     return Begin;
825   DataRefImpl RelData = Begin->getRawDataRefImpl();
826   const Elf_Shdr *RelSec = getRelSection(RelData);
827 
828   // Error check sh_link here so that getRelocationSymbol can just use it.
829   auto SymSecOrErr = EF.getSection(RelSec->sh_link);
830   if (!SymSecOrErr)
831     report_fatal_error(errorToErrorCode(SymSecOrErr.takeError()).message());
832 
833   RelData.d.b += S->sh_size / S->sh_entsize;
834   return relocation_iterator(RelocationRef(RelData, this));
835 }
836 
837 template <class ELFT>
838 section_iterator
839 ELFObjectFile<ELFT>::getRelocatedSection(DataRefImpl Sec) const {
840   if (EF.getHeader()->e_type != ELF::ET_REL)
841     return section_end();
842 
843   const Elf_Shdr *EShdr = getSection(Sec);
844   uintX_t Type = EShdr->sh_type;
845   if (Type != ELF::SHT_REL && Type != ELF::SHT_RELA)
846     return section_end();
847 
848   auto R = EF.getSection(EShdr->sh_info);
849   if (!R)
850     report_fatal_error(errorToErrorCode(R.takeError()).message());
851   return section_iterator(SectionRef(toDRI(*R), this));
852 }
853 
854 // Relocations
855 template <class ELFT>
856 void ELFObjectFile<ELFT>::moveRelocationNext(DataRefImpl &Rel) const {
857   ++Rel.d.b;
858 }
859 
860 template <class ELFT>
861 symbol_iterator
862 ELFObjectFile<ELFT>::getRelocationSymbol(DataRefImpl Rel) const {
863   uint32_t symbolIdx;
864   const Elf_Shdr *sec = getRelSection(Rel);
865   if (sec->sh_type == ELF::SHT_REL)
866     symbolIdx = getRel(Rel)->getSymbol(EF.isMips64EL());
867   else
868     symbolIdx = getRela(Rel)->getSymbol(EF.isMips64EL());
869   if (!symbolIdx)
870     return symbol_end();
871 
872   // FIXME: error check symbolIdx
873   DataRefImpl SymbolData;
874   SymbolData.d.a = sec->sh_link;
875   SymbolData.d.b = symbolIdx;
876   return symbol_iterator(SymbolRef(SymbolData, this));
877 }
878 
879 template <class ELFT>
880 uint64_t ELFObjectFile<ELFT>::getRelocationOffset(DataRefImpl Rel) const {
881   const Elf_Shdr *sec = getRelSection(Rel);
882   if (sec->sh_type == ELF::SHT_REL)
883     return getRel(Rel)->r_offset;
884 
885   return getRela(Rel)->r_offset;
886 }
887 
888 template <class ELFT>
889 uint64_t ELFObjectFile<ELFT>::getRelocationType(DataRefImpl Rel) const {
890   const Elf_Shdr *sec = getRelSection(Rel);
891   if (sec->sh_type == ELF::SHT_REL)
892     return getRel(Rel)->getType(EF.isMips64EL());
893   else
894     return getRela(Rel)->getType(EF.isMips64EL());
895 }
896 
897 template <class ELFT>
898 StringRef ELFObjectFile<ELFT>::getRelocationTypeName(uint32_t Type) const {
899   return getELFRelocationTypeName(EF.getHeader()->e_machine, Type);
900 }
901 
902 template <class ELFT>
903 void ELFObjectFile<ELFT>::getRelocationTypeName(
904     DataRefImpl Rel, SmallVectorImpl<char> &Result) const {
905   uint32_t type = getRelocationType(Rel);
906   EF.getRelocationTypeName(type, Result);
907 }
908 
909 template <class ELFT>
910 Expected<int64_t>
911 ELFObjectFile<ELFT>::getRelocationAddend(DataRefImpl Rel) const {
912   if (getRelSection(Rel)->sh_type != ELF::SHT_RELA)
913     return createError("Section is not SHT_RELA");
914   return (int64_t)getRela(Rel)->r_addend;
915 }
916 
917 template <class ELFT>
918 const typename ELFObjectFile<ELFT>::Elf_Rel *
919 ELFObjectFile<ELFT>::getRel(DataRefImpl Rel) const {
920   assert(getRelSection(Rel)->sh_type == ELF::SHT_REL);
921   auto Ret = EF.template getEntry<Elf_Rel>(Rel.d.a, Rel.d.b);
922   if (!Ret)
923     report_fatal_error(errorToErrorCode(Ret.takeError()).message());
924   return *Ret;
925 }
926 
927 template <class ELFT>
928 const typename ELFObjectFile<ELFT>::Elf_Rela *
929 ELFObjectFile<ELFT>::getRela(DataRefImpl Rela) const {
930   assert(getRelSection(Rela)->sh_type == ELF::SHT_RELA);
931   auto Ret = EF.template getEntry<Elf_Rela>(Rela.d.a, Rela.d.b);
932   if (!Ret)
933     report_fatal_error(errorToErrorCode(Ret.takeError()).message());
934   return *Ret;
935 }
936 
937 template <class ELFT>
938 Expected<ELFObjectFile<ELFT>>
939 ELFObjectFile<ELFT>::create(MemoryBufferRef Object) {
940   auto EFOrErr = ELFFile<ELFT>::create(Object.getBuffer());
941   if (Error E = EFOrErr.takeError())
942     return std::move(E);
943   auto EF = std::move(*EFOrErr);
944 
945   auto SectionsOrErr = EF.sections();
946   if (!SectionsOrErr)
947     return SectionsOrErr.takeError();
948 
949   const Elf_Shdr *DotDynSymSec = nullptr;
950   const Elf_Shdr *DotSymtabSec = nullptr;
951   ArrayRef<Elf_Word> ShndxTable;
952   for (const Elf_Shdr &Sec : *SectionsOrErr) {
953     switch (Sec.sh_type) {
954     case ELF::SHT_DYNSYM: {
955       if (!DotDynSymSec)
956         DotDynSymSec = &Sec;
957       break;
958     }
959     case ELF::SHT_SYMTAB: {
960       if (!DotSymtabSec)
961         DotSymtabSec = &Sec;
962       break;
963     }
964     case ELF::SHT_SYMTAB_SHNDX: {
965       auto TableOrErr = EF.getSHNDXTable(Sec);
966       if (!TableOrErr)
967         return TableOrErr.takeError();
968       ShndxTable = *TableOrErr;
969       break;
970     }
971     }
972   }
973   return ELFObjectFile<ELFT>(Object, EF, DotDynSymSec, DotSymtabSec,
974                              ShndxTable);
975 }
976 
977 template <class ELFT>
978 ELFObjectFile<ELFT>::ELFObjectFile(MemoryBufferRef Object, ELFFile<ELFT> EF,
979                                    const Elf_Shdr *DotDynSymSec,
980                                    const Elf_Shdr *DotSymtabSec,
981                                    ArrayRef<Elf_Word> ShndxTable)
982     : ELFObjectFileBase(
983           getELFType(ELFT::TargetEndianness == support::little, ELFT::Is64Bits),
984           Object),
985       EF(EF), DotDynSymSec(DotDynSymSec), DotSymtabSec(DotSymtabSec),
986       ShndxTable(ShndxTable) {}
987 
988 template <class ELFT>
989 ELFObjectFile<ELFT>::ELFObjectFile(ELFObjectFile<ELFT> &&Other)
990     : ELFObjectFile(Other.Data, Other.EF, Other.DotDynSymSec,
991                     Other.DotSymtabSec, Other.ShndxTable) {}
992 
993 template <class ELFT>
994 basic_symbol_iterator ELFObjectFile<ELFT>::symbol_begin() const {
995   DataRefImpl Sym =
996       toDRI(DotSymtabSec,
997             DotSymtabSec && DotSymtabSec->sh_size >= sizeof(Elf_Sym) ? 1 : 0);
998   return basic_symbol_iterator(SymbolRef(Sym, this));
999 }
1000 
1001 template <class ELFT>
1002 basic_symbol_iterator ELFObjectFile<ELFT>::symbol_end() const {
1003   const Elf_Shdr *SymTab = DotSymtabSec;
1004   if (!SymTab)
1005     return symbol_begin();
1006   DataRefImpl Sym = toDRI(SymTab, SymTab->sh_size / sizeof(Elf_Sym));
1007   return basic_symbol_iterator(SymbolRef(Sym, this));
1008 }
1009 
1010 template <class ELFT>
1011 elf_symbol_iterator ELFObjectFile<ELFT>::dynamic_symbol_begin() const {
1012   DataRefImpl Sym = toDRI(DotDynSymSec, 0);
1013   return symbol_iterator(SymbolRef(Sym, this));
1014 }
1015 
1016 template <class ELFT>
1017 elf_symbol_iterator ELFObjectFile<ELFT>::dynamic_symbol_end() const {
1018   const Elf_Shdr *SymTab = DotDynSymSec;
1019   if (!SymTab)
1020     return dynamic_symbol_begin();
1021   DataRefImpl Sym = toDRI(SymTab, SymTab->sh_size / sizeof(Elf_Sym));
1022   return basic_symbol_iterator(SymbolRef(Sym, this));
1023 }
1024 
1025 template <class ELFT>
1026 section_iterator ELFObjectFile<ELFT>::section_begin() const {
1027   auto SectionsOrErr = EF.sections();
1028   if (!SectionsOrErr)
1029     return section_iterator(SectionRef());
1030   return section_iterator(SectionRef(toDRI((*SectionsOrErr).begin()), this));
1031 }
1032 
1033 template <class ELFT>
1034 section_iterator ELFObjectFile<ELFT>::section_end() const {
1035   auto SectionsOrErr = EF.sections();
1036   if (!SectionsOrErr)
1037     return section_iterator(SectionRef());
1038   return section_iterator(SectionRef(toDRI((*SectionsOrErr).end()), this));
1039 }
1040 
1041 template <class ELFT>
1042 uint8_t ELFObjectFile<ELFT>::getBytesInAddress() const {
1043   return ELFT::Is64Bits ? 8 : 4;
1044 }
1045 
1046 template <class ELFT>
1047 StringRef ELFObjectFile<ELFT>::getFileFormatName() const {
1048   bool IsLittleEndian = ELFT::TargetEndianness == support::little;
1049   switch (EF.getHeader()->e_ident[ELF::EI_CLASS]) {
1050   case ELF::ELFCLASS32:
1051     switch (EF.getHeader()->e_machine) {
1052     case ELF::EM_386:
1053       return "ELF32-i386";
1054     case ELF::EM_IAMCU:
1055       return "ELF32-iamcu";
1056     case ELF::EM_X86_64:
1057       return "ELF32-x86-64";
1058     case ELF::EM_ARM:
1059       return (IsLittleEndian ? "ELF32-arm-little" : "ELF32-arm-big");
1060     case ELF::EM_AVR:
1061       return "ELF32-avr";
1062     case ELF::EM_HEXAGON:
1063       return "ELF32-hexagon";
1064     case ELF::EM_LANAI:
1065       return "ELF32-lanai";
1066     case ELF::EM_MIPS:
1067       return "ELF32-mips";
1068     case ELF::EM_MSP430:
1069       return "ELF32-msp430";
1070     case ELF::EM_PPC:
1071       return "ELF32-ppc";
1072     case ELF::EM_RISCV:
1073       return "ELF32-riscv";
1074     case ELF::EM_SPARC:
1075     case ELF::EM_SPARC32PLUS:
1076       return "ELF32-sparc";
1077     case ELF::EM_AMDGPU:
1078       return "ELF32-amdgpu";
1079     default:
1080       return "ELF32-unknown";
1081     }
1082   case ELF::ELFCLASS64:
1083     switch (EF.getHeader()->e_machine) {
1084     case ELF::EM_386:
1085       return "ELF64-i386";
1086     case ELF::EM_X86_64:
1087       return "ELF64-x86-64";
1088     case ELF::EM_AARCH64:
1089       return (IsLittleEndian ? "ELF64-aarch64-little" : "ELF64-aarch64-big");
1090     case ELF::EM_PPC64:
1091       return "ELF64-ppc64";
1092     case ELF::EM_RISCV:
1093       return "ELF64-riscv";
1094     case ELF::EM_S390:
1095       return "ELF64-s390";
1096     case ELF::EM_SPARCV9:
1097       return "ELF64-sparc";
1098     case ELF::EM_MIPS:
1099       return "ELF64-mips";
1100     case ELF::EM_AMDGPU:
1101       return "ELF64-amdgpu";
1102     case ELF::EM_BPF:
1103       return "ELF64-BPF";
1104     default:
1105       return "ELF64-unknown";
1106     }
1107   default:
1108     // FIXME: Proper error handling.
1109     report_fatal_error("Invalid ELFCLASS!");
1110   }
1111 }
1112 
1113 template <class ELFT> Triple::ArchType ELFObjectFile<ELFT>::getArch() const {
1114   bool IsLittleEndian = ELFT::TargetEndianness == support::little;
1115   switch (EF.getHeader()->e_machine) {
1116   case ELF::EM_386:
1117   case ELF::EM_IAMCU:
1118     return Triple::x86;
1119   case ELF::EM_X86_64:
1120     return Triple::x86_64;
1121   case ELF::EM_AARCH64:
1122     return IsLittleEndian ? Triple::aarch64 : Triple::aarch64_be;
1123   case ELF::EM_ARM:
1124     return Triple::arm;
1125   case ELF::EM_AVR:
1126     return Triple::avr;
1127   case ELF::EM_HEXAGON:
1128     return Triple::hexagon;
1129   case ELF::EM_LANAI:
1130     return Triple::lanai;
1131   case ELF::EM_MIPS:
1132     switch (EF.getHeader()->e_ident[ELF::EI_CLASS]) {
1133     case ELF::ELFCLASS32:
1134       return IsLittleEndian ? Triple::mipsel : Triple::mips;
1135     case ELF::ELFCLASS64:
1136       return IsLittleEndian ? Triple::mips64el : Triple::mips64;
1137     default:
1138       report_fatal_error("Invalid ELFCLASS!");
1139     }
1140   case ELF::EM_MSP430:
1141     return Triple::msp430;
1142   case ELF::EM_PPC:
1143     return Triple::ppc;
1144   case ELF::EM_PPC64:
1145     return IsLittleEndian ? Triple::ppc64le : Triple::ppc64;
1146   case ELF::EM_RISCV:
1147     switch (EF.getHeader()->e_ident[ELF::EI_CLASS]) {
1148     case ELF::ELFCLASS32:
1149       return Triple::riscv32;
1150     case ELF::ELFCLASS64:
1151       return Triple::riscv64;
1152     default:
1153       report_fatal_error("Invalid ELFCLASS!");
1154     }
1155   case ELF::EM_S390:
1156     return Triple::systemz;
1157 
1158   case ELF::EM_SPARC:
1159   case ELF::EM_SPARC32PLUS:
1160     return IsLittleEndian ? Triple::sparcel : Triple::sparc;
1161   case ELF::EM_SPARCV9:
1162     return Triple::sparcv9;
1163 
1164   case ELF::EM_AMDGPU: {
1165     if (!IsLittleEndian)
1166       return Triple::UnknownArch;
1167 
1168     unsigned MACH = EF.getHeader()->e_flags & ELF::EF_AMDGPU_MACH;
1169     if (MACH >= ELF::EF_AMDGPU_MACH_R600_FIRST &&
1170         MACH <= ELF::EF_AMDGPU_MACH_R600_LAST)
1171       return Triple::r600;
1172     if (MACH >= ELF::EF_AMDGPU_MACH_AMDGCN_FIRST &&
1173         MACH <= ELF::EF_AMDGPU_MACH_AMDGCN_LAST)
1174       return Triple::amdgcn;
1175 
1176     return Triple::UnknownArch;
1177   }
1178 
1179   case ELF::EM_BPF:
1180     return IsLittleEndian ? Triple::bpfel : Triple::bpfeb;
1181 
1182   default:
1183     return Triple::UnknownArch;
1184   }
1185 }
1186 
1187 template <class ELFT>
1188 Expected<uint64_t> ELFObjectFile<ELFT>::getStartAddress() const {
1189   return EF.getHeader()->e_entry;
1190 }
1191 
1192 template <class ELFT>
1193 ELFObjectFileBase::elf_symbol_iterator_range
1194 ELFObjectFile<ELFT>::getDynamicSymbolIterators() const {
1195   return make_range(dynamic_symbol_begin(), dynamic_symbol_end());
1196 }
1197 
1198 template <class ELFT> bool ELFObjectFile<ELFT>::isRelocatableObject() const {
1199   return EF.getHeader()->e_type == ELF::ET_REL;
1200 }
1201 
1202 } // end namespace object
1203 } // end namespace llvm
1204 
1205 #endif // LLVM_OBJECT_ELFOBJECTFILE_H
1206