Import prebuilt clang toolchain for linux.
diff --git a/linux-x64/clang/include/llvm/Object/ELF.h b/linux-x64/clang/include/llvm/Object/ELF.h
new file mode 100644
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+++ b/linux-x64/clang/include/llvm/Object/ELF.h
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+//===- ELF.h - ELF object file implementation -------------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares the ELFFile template class.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_OBJECT_ELF_H
+#define LLVM_OBJECT_ELF_H
+
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/BinaryFormat/ELF.h"
+#include "llvm/Object/ELFTypes.h"
+#include "llvm/Object/Error.h"
+#include "llvm/Support/Endian.h"
+#include "llvm/Support/Error.h"
+#include <cassert>
+#include <cstddef>
+#include <cstdint>
+#include <limits>
+#include <utility>
+
+namespace llvm {
+namespace object {
+
+StringRef getELFRelocationTypeName(uint32_t Machine, uint32_t Type);
+StringRef getELFSectionTypeName(uint32_t Machine, uint32_t Type);
+
+// Subclasses of ELFFile may need this for template instantiation
+inline std::pair<unsigned char, unsigned char>
+getElfArchType(StringRef Object) {
+ if (Object.size() < ELF::EI_NIDENT)
+ return std::make_pair((uint8_t)ELF::ELFCLASSNONE,
+ (uint8_t)ELF::ELFDATANONE);
+ return std::make_pair((uint8_t)Object[ELF::EI_CLASS],
+ (uint8_t)Object[ELF::EI_DATA]);
+}
+
+static inline Error createError(StringRef Err) {
+ return make_error<StringError>(Err, object_error::parse_failed);
+}
+
+template <class ELFT>
+class ELFFile {
+public:
+ LLVM_ELF_IMPORT_TYPES_ELFT(ELFT)
+ using uintX_t = typename ELFT::uint;
+ using Elf_Ehdr = typename ELFT::Ehdr;
+ using Elf_Shdr = typename ELFT::Shdr;
+ using Elf_Sym = typename ELFT::Sym;
+ using Elf_Dyn = typename ELFT::Dyn;
+ using Elf_Phdr = typename ELFT::Phdr;
+ using Elf_Rel = typename ELFT::Rel;
+ using Elf_Rela = typename ELFT::Rela;
+ using Elf_Verdef = typename ELFT::Verdef;
+ using Elf_Verdaux = typename ELFT::Verdaux;
+ using Elf_Verneed = typename ELFT::Verneed;
+ using Elf_Vernaux = typename ELFT::Vernaux;
+ using Elf_Versym = typename ELFT::Versym;
+ using Elf_Hash = typename ELFT::Hash;
+ using Elf_GnuHash = typename ELFT::GnuHash;
+ using Elf_Nhdr = typename ELFT::Nhdr;
+ using Elf_Note = typename ELFT::Note;
+ using Elf_Note_Iterator = typename ELFT::NoteIterator;
+ using Elf_Dyn_Range = typename ELFT::DynRange;
+ using Elf_Shdr_Range = typename ELFT::ShdrRange;
+ using Elf_Sym_Range = typename ELFT::SymRange;
+ using Elf_Rel_Range = typename ELFT::RelRange;
+ using Elf_Rela_Range = typename ELFT::RelaRange;
+ using Elf_Phdr_Range = typename ELFT::PhdrRange;
+
+ const uint8_t *base() const {
+ return reinterpret_cast<const uint8_t *>(Buf.data());
+ }
+
+ size_t getBufSize() const { return Buf.size(); }
+
+private:
+ StringRef Buf;
+
+ ELFFile(StringRef Object);
+
+public:
+ const Elf_Ehdr *getHeader() const {
+ return reinterpret_cast<const Elf_Ehdr *>(base());
+ }
+
+ template <typename T>
+ Expected<const T *> getEntry(uint32_t Section, uint32_t Entry) const;
+ template <typename T>
+ Expected<const T *> getEntry(const Elf_Shdr *Section, uint32_t Entry) const;
+
+ Expected<StringRef> getStringTable(const Elf_Shdr *Section) const;
+ Expected<StringRef> getStringTableForSymtab(const Elf_Shdr &Section) const;
+ Expected<StringRef> getStringTableForSymtab(const Elf_Shdr &Section,
+ Elf_Shdr_Range Sections) const;
+
+ Expected<ArrayRef<Elf_Word>> getSHNDXTable(const Elf_Shdr &Section) const;
+ Expected<ArrayRef<Elf_Word>> getSHNDXTable(const Elf_Shdr &Section,
+ Elf_Shdr_Range Sections) const;
+
+ StringRef getRelocationTypeName(uint32_t Type) const;
+ void getRelocationTypeName(uint32_t Type,
+ SmallVectorImpl<char> &Result) const;
+
+ /// \brief Get the symbol for a given relocation.
+ Expected<const Elf_Sym *> getRelocationSymbol(const Elf_Rel *Rel,
+ const Elf_Shdr *SymTab) const;
+
+ static Expected<ELFFile> create(StringRef Object);
+
+ bool isMipsELF64() const {
+ return getHeader()->e_machine == ELF::EM_MIPS &&
+ getHeader()->getFileClass() == ELF::ELFCLASS64;
+ }
+
+ bool isMips64EL() const {
+ return isMipsELF64() &&
+ getHeader()->getDataEncoding() == ELF::ELFDATA2LSB;
+ }
+
+ Expected<Elf_Shdr_Range> sections() const;
+
+ Expected<Elf_Sym_Range> symbols(const Elf_Shdr *Sec) const {
+ if (!Sec)
+ return makeArrayRef<Elf_Sym>(nullptr, nullptr);
+ return getSectionContentsAsArray<Elf_Sym>(Sec);
+ }
+
+ Expected<Elf_Rela_Range> relas(const Elf_Shdr *Sec) const {
+ return getSectionContentsAsArray<Elf_Rela>(Sec);
+ }
+
+ Expected<Elf_Rel_Range> rels(const Elf_Shdr *Sec) const {
+ return getSectionContentsAsArray<Elf_Rel>(Sec);
+ }
+
+ Expected<std::vector<Elf_Rela>> android_relas(const Elf_Shdr *Sec) const;
+
+ /// \brief Iterate over program header table.
+ Expected<Elf_Phdr_Range> program_headers() const {
+ if (getHeader()->e_phnum && getHeader()->e_phentsize != sizeof(Elf_Phdr))
+ return createError("invalid e_phentsize");
+ if (getHeader()->e_phoff +
+ (getHeader()->e_phnum * getHeader()->e_phentsize) >
+ getBufSize())
+ return createError("program headers longer than binary");
+ auto *Begin =
+ reinterpret_cast<const Elf_Phdr *>(base() + getHeader()->e_phoff);
+ return makeArrayRef(Begin, Begin + getHeader()->e_phnum);
+ }
+
+ /// Get an iterator over notes in a program header.
+ ///
+ /// The program header must be of type \c PT_NOTE.
+ ///
+ /// \param Phdr the program header to iterate over.
+ /// \param Err [out] an error to support fallible iteration, which should
+ /// be checked after iteration ends.
+ Elf_Note_Iterator notes_begin(const Elf_Phdr &Phdr, Error &Err) const {
+ if (Phdr.p_type != ELF::PT_NOTE) {
+ Err = createError("attempt to iterate notes of non-note program header");
+ return Elf_Note_Iterator(Err);
+ }
+ if (Phdr.p_offset + Phdr.p_filesz > getBufSize()) {
+ Err = createError("invalid program header offset/size");
+ return Elf_Note_Iterator(Err);
+ }
+ return Elf_Note_Iterator(base() + Phdr.p_offset, Phdr.p_filesz, Err);
+ }
+
+ /// Get an iterator over notes in a section.
+ ///
+ /// The section must be of type \c SHT_NOTE.
+ ///
+ /// \param Shdr the section to iterate over.
+ /// \param Err [out] an error to support fallible iteration, which should
+ /// be checked after iteration ends.
+ Elf_Note_Iterator notes_begin(const Elf_Shdr &Shdr, Error &Err) const {
+ if (Shdr.sh_type != ELF::SHT_NOTE) {
+ Err = createError("attempt to iterate notes of non-note section");
+ return Elf_Note_Iterator(Err);
+ }
+ if (Shdr.sh_offset + Shdr.sh_size > getBufSize()) {
+ Err = createError("invalid section offset/size");
+ return Elf_Note_Iterator(Err);
+ }
+ return Elf_Note_Iterator(base() + Shdr.sh_offset, Shdr.sh_size, Err);
+ }
+
+ /// Get the end iterator for notes.
+ Elf_Note_Iterator notes_end() const {
+ return Elf_Note_Iterator();
+ }
+
+ /// Get an iterator range over notes of a program header.
+ ///
+ /// The program header must be of type \c PT_NOTE.
+ ///
+ /// \param Phdr the program header to iterate over.
+ /// \param Err [out] an error to support fallible iteration, which should
+ /// be checked after iteration ends.
+ iterator_range<Elf_Note_Iterator> notes(const Elf_Phdr &Phdr,
+ Error &Err) const {
+ return make_range(notes_begin(Phdr, Err), notes_end());
+ }
+
+ /// Get an iterator range over notes of a section.
+ ///
+ /// The section must be of type \c SHT_NOTE.
+ ///
+ /// \param Shdr the section to iterate over.
+ /// \param Err [out] an error to support fallible iteration, which should
+ /// be checked after iteration ends.
+ iterator_range<Elf_Note_Iterator> notes(const Elf_Shdr &Shdr,
+ Error &Err) const {
+ return make_range(notes_begin(Shdr, Err), notes_end());
+ }
+
+ Expected<StringRef> getSectionStringTable(Elf_Shdr_Range Sections) const;
+ Expected<uint32_t> getSectionIndex(const Elf_Sym *Sym, Elf_Sym_Range Syms,
+ ArrayRef<Elf_Word> ShndxTable) const;
+ Expected<const Elf_Shdr *> getSection(const Elf_Sym *Sym,
+ const Elf_Shdr *SymTab,
+ ArrayRef<Elf_Word> ShndxTable) const;
+ Expected<const Elf_Shdr *> getSection(const Elf_Sym *Sym,
+ Elf_Sym_Range Symtab,
+ ArrayRef<Elf_Word> ShndxTable) const;
+ Expected<const Elf_Shdr *> getSection(uint32_t Index) const;
+
+ Expected<const Elf_Sym *> getSymbol(const Elf_Shdr *Sec,
+ uint32_t Index) const;
+
+ Expected<StringRef> getSectionName(const Elf_Shdr *Section) const;
+ Expected<StringRef> getSectionName(const Elf_Shdr *Section,
+ StringRef DotShstrtab) const;
+ template <typename T>
+ Expected<ArrayRef<T>> getSectionContentsAsArray(const Elf_Shdr *Sec) const;
+ Expected<ArrayRef<uint8_t>> getSectionContents(const Elf_Shdr *Sec) const;
+};
+
+using ELF32LEFile = ELFFile<ELF32LE>;
+using ELF64LEFile = ELFFile<ELF64LE>;
+using ELF32BEFile = ELFFile<ELF32BE>;
+using ELF64BEFile = ELFFile<ELF64BE>;
+
+template <class ELFT>
+inline Expected<const typename ELFT::Shdr *>
+getSection(typename ELFT::ShdrRange Sections, uint32_t Index) {
+ if (Index >= Sections.size())
+ return createError("invalid section index");
+ return &Sections[Index];
+}
+
+template <class ELFT>
+inline Expected<uint32_t>
+getExtendedSymbolTableIndex(const typename ELFT::Sym *Sym,
+ const typename ELFT::Sym *FirstSym,
+ ArrayRef<typename ELFT::Word> ShndxTable) {
+ assert(Sym->st_shndx == ELF::SHN_XINDEX);
+ unsigned Index = Sym - FirstSym;
+ if (Index >= ShndxTable.size())
+ return createError("index past the end of the symbol table");
+
+ // The size of the table was checked in getSHNDXTable.
+ return ShndxTable[Index];
+}
+
+template <class ELFT>
+Expected<uint32_t>
+ELFFile<ELFT>::getSectionIndex(const Elf_Sym *Sym, Elf_Sym_Range Syms,
+ ArrayRef<Elf_Word> ShndxTable) const {
+ uint32_t Index = Sym->st_shndx;
+ if (Index == ELF::SHN_XINDEX) {
+ auto ErrorOrIndex = getExtendedSymbolTableIndex<ELFT>(
+ Sym, Syms.begin(), ShndxTable);
+ if (!ErrorOrIndex)
+ return ErrorOrIndex.takeError();
+ return *ErrorOrIndex;
+ }
+ if (Index == ELF::SHN_UNDEF || Index >= ELF::SHN_LORESERVE)
+ return 0;
+ return Index;
+}
+
+template <class ELFT>
+Expected<const typename ELFT::Shdr *>
+ELFFile<ELFT>::getSection(const Elf_Sym *Sym, const Elf_Shdr *SymTab,
+ ArrayRef<Elf_Word> ShndxTable) const {
+ auto SymsOrErr = symbols(SymTab);
+ if (!SymsOrErr)
+ return SymsOrErr.takeError();
+ return getSection(Sym, *SymsOrErr, ShndxTable);
+}
+
+template <class ELFT>
+Expected<const typename ELFT::Shdr *>
+ELFFile<ELFT>::getSection(const Elf_Sym *Sym, Elf_Sym_Range Symbols,
+ ArrayRef<Elf_Word> ShndxTable) const {
+ auto IndexOrErr = getSectionIndex(Sym, Symbols, ShndxTable);
+ if (!IndexOrErr)
+ return IndexOrErr.takeError();
+ uint32_t Index = *IndexOrErr;
+ if (Index == 0)
+ return nullptr;
+ return getSection(Index);
+}
+
+template <class ELFT>
+inline Expected<const typename ELFT::Sym *>
+getSymbol(typename ELFT::SymRange Symbols, uint32_t Index) {
+ if (Index >= Symbols.size())
+ return createError("invalid symbol index");
+ return &Symbols[Index];
+}
+
+template <class ELFT>
+Expected<const typename ELFT::Sym *>
+ELFFile<ELFT>::getSymbol(const Elf_Shdr *Sec, uint32_t Index) const {
+ auto SymtabOrErr = symbols(Sec);
+ if (!SymtabOrErr)
+ return SymtabOrErr.takeError();
+ return object::getSymbol<ELFT>(*SymtabOrErr, Index);
+}
+
+template <class ELFT>
+template <typename T>
+Expected<ArrayRef<T>>
+ELFFile<ELFT>::getSectionContentsAsArray(const Elf_Shdr *Sec) const {
+ if (Sec->sh_entsize != sizeof(T) && sizeof(T) != 1)
+ return createError("invalid sh_entsize");
+
+ uintX_t Offset = Sec->sh_offset;
+ uintX_t Size = Sec->sh_size;
+
+ if (Size % sizeof(T))
+ return createError("size is not a multiple of sh_entsize");
+ if ((std::numeric_limits<uintX_t>::max() - Offset < Size) ||
+ Offset + Size > Buf.size())
+ return createError("invalid section offset");
+
+ if (Offset % alignof(T))
+ return createError("unaligned data");
+
+ const T *Start = reinterpret_cast<const T *>(base() + Offset);
+ return makeArrayRef(Start, Size / sizeof(T));
+}
+
+template <class ELFT>
+Expected<ArrayRef<uint8_t>>
+ELFFile<ELFT>::getSectionContents(const Elf_Shdr *Sec) const {
+ return getSectionContentsAsArray<uint8_t>(Sec);
+}
+
+template <class ELFT>
+StringRef ELFFile<ELFT>::getRelocationTypeName(uint32_t Type) const {
+ return getELFRelocationTypeName(getHeader()->e_machine, Type);
+}
+
+template <class ELFT>
+void ELFFile<ELFT>::getRelocationTypeName(uint32_t Type,
+ SmallVectorImpl<char> &Result) const {
+ if (!isMipsELF64()) {
+ StringRef Name = getRelocationTypeName(Type);
+ Result.append(Name.begin(), Name.end());
+ } else {
+ // The Mips N64 ABI allows up to three operations to be specified per
+ // relocation record. Unfortunately there's no easy way to test for the
+ // presence of N64 ELFs as they have no special flag that identifies them
+ // as being N64. We can safely assume at the moment that all Mips
+ // ELFCLASS64 ELFs are N64. New Mips64 ABIs should provide enough
+ // information to disambiguate between old vs new ABIs.
+ uint8_t Type1 = (Type >> 0) & 0xFF;
+ uint8_t Type2 = (Type >> 8) & 0xFF;
+ uint8_t Type3 = (Type >> 16) & 0xFF;
+
+ // Concat all three relocation type names.
+ StringRef Name = getRelocationTypeName(Type1);
+ Result.append(Name.begin(), Name.end());
+
+ Name = getRelocationTypeName(Type2);
+ Result.append(1, '/');
+ Result.append(Name.begin(), Name.end());
+
+ Name = getRelocationTypeName(Type3);
+ Result.append(1, '/');
+ Result.append(Name.begin(), Name.end());
+ }
+}
+
+template <class ELFT>
+Expected<const typename ELFT::Sym *>
+ELFFile<ELFT>::getRelocationSymbol(const Elf_Rel *Rel,
+ const Elf_Shdr *SymTab) const {
+ uint32_t Index = Rel->getSymbol(isMips64EL());
+ if (Index == 0)
+ return nullptr;
+ return getEntry<Elf_Sym>(SymTab, Index);
+}
+
+template <class ELFT>
+Expected<StringRef>
+ELFFile<ELFT>::getSectionStringTable(Elf_Shdr_Range Sections) const {
+ uint32_t Index = getHeader()->e_shstrndx;
+ if (Index == ELF::SHN_XINDEX)
+ Index = Sections[0].sh_link;
+
+ if (!Index) // no section string table.
+ return "";
+ if (Index >= Sections.size())
+ return createError("invalid section index");
+ return getStringTable(&Sections[Index]);
+}
+
+template <class ELFT> ELFFile<ELFT>::ELFFile(StringRef Object) : Buf(Object) {}
+
+template <class ELFT>
+Expected<ELFFile<ELFT>> ELFFile<ELFT>::create(StringRef Object) {
+ if (sizeof(Elf_Ehdr) > Object.size())
+ return createError("Invalid buffer");
+ return ELFFile(Object);
+}
+
+template <class ELFT>
+Expected<typename ELFT::ShdrRange> ELFFile<ELFT>::sections() const {
+ const uintX_t SectionTableOffset = getHeader()->e_shoff;
+ if (SectionTableOffset == 0)
+ return ArrayRef<Elf_Shdr>();
+
+ if (getHeader()->e_shentsize != sizeof(Elf_Shdr))
+ return createError(
+ "invalid section header entry size (e_shentsize) in ELF header");
+
+ const uint64_t FileSize = Buf.size();
+
+ if (SectionTableOffset + sizeof(Elf_Shdr) > FileSize)
+ return createError("section header table goes past the end of the file");
+
+ // Invalid address alignment of section headers
+ if (SectionTableOffset & (alignof(Elf_Shdr) - 1))
+ return createError("invalid alignment of section headers");
+
+ const Elf_Shdr *First =
+ reinterpret_cast<const Elf_Shdr *>(base() + SectionTableOffset);
+
+ uintX_t NumSections = getHeader()->e_shnum;
+ if (NumSections == 0)
+ NumSections = First->sh_size;
+
+ if (NumSections > UINT64_MAX / sizeof(Elf_Shdr))
+ return createError("section table goes past the end of file");
+
+ const uint64_t SectionTableSize = NumSections * sizeof(Elf_Shdr);
+
+ // Section table goes past end of file!
+ if (SectionTableOffset + SectionTableSize > FileSize)
+ return createError("section table goes past the end of file");
+
+ return makeArrayRef(First, NumSections);
+}
+
+template <class ELFT>
+template <typename T>
+Expected<const T *> ELFFile<ELFT>::getEntry(uint32_t Section,
+ uint32_t Entry) const {
+ auto SecOrErr = getSection(Section);
+ if (!SecOrErr)
+ return SecOrErr.takeError();
+ return getEntry<T>(*SecOrErr, Entry);
+}
+
+template <class ELFT>
+template <typename T>
+Expected<const T *> ELFFile<ELFT>::getEntry(const Elf_Shdr *Section,
+ uint32_t Entry) const {
+ if (sizeof(T) != Section->sh_entsize)
+ return createError("invalid sh_entsize");
+ size_t Pos = Section->sh_offset + Entry * sizeof(T);
+ if (Pos + sizeof(T) > Buf.size())
+ return createError("invalid section offset");
+ return reinterpret_cast<const T *>(base() + Pos);
+}
+
+template <class ELFT>
+Expected<const typename ELFT::Shdr *>
+ELFFile<ELFT>::getSection(uint32_t Index) const {
+ auto TableOrErr = sections();
+ if (!TableOrErr)
+ return TableOrErr.takeError();
+ return object::getSection<ELFT>(*TableOrErr, Index);
+}
+
+template <class ELFT>
+Expected<StringRef>
+ELFFile<ELFT>::getStringTable(const Elf_Shdr *Section) const {
+ if (Section->sh_type != ELF::SHT_STRTAB)
+ return createError("invalid sh_type for string table, expected SHT_STRTAB");
+ auto V = getSectionContentsAsArray<char>(Section);
+ if (!V)
+ return V.takeError();
+ ArrayRef<char> Data = *V;
+ if (Data.empty())
+ return createError("empty string table");
+ if (Data.back() != '\0')
+ return createError("string table non-null terminated");
+ return StringRef(Data.begin(), Data.size());
+}
+
+template <class ELFT>
+Expected<ArrayRef<typename ELFT::Word>>
+ELFFile<ELFT>::getSHNDXTable(const Elf_Shdr &Section) const {
+ auto SectionsOrErr = sections();
+ if (!SectionsOrErr)
+ return SectionsOrErr.takeError();
+ return getSHNDXTable(Section, *SectionsOrErr);
+}
+
+template <class ELFT>
+Expected<ArrayRef<typename ELFT::Word>>
+ELFFile<ELFT>::getSHNDXTable(const Elf_Shdr &Section,
+ Elf_Shdr_Range Sections) const {
+ assert(Section.sh_type == ELF::SHT_SYMTAB_SHNDX);
+ auto VOrErr = getSectionContentsAsArray<Elf_Word>(&Section);
+ if (!VOrErr)
+ return VOrErr.takeError();
+ ArrayRef<Elf_Word> V = *VOrErr;
+ auto SymTableOrErr = object::getSection<ELFT>(Sections, Section.sh_link);
+ if (!SymTableOrErr)
+ return SymTableOrErr.takeError();
+ const Elf_Shdr &SymTable = **SymTableOrErr;
+ if (SymTable.sh_type != ELF::SHT_SYMTAB &&
+ SymTable.sh_type != ELF::SHT_DYNSYM)
+ return createError("invalid sh_type");
+ if (V.size() != (SymTable.sh_size / sizeof(Elf_Sym)))
+ return createError("invalid section contents size");
+ return V;
+}
+
+template <class ELFT>
+Expected<StringRef>
+ELFFile<ELFT>::getStringTableForSymtab(const Elf_Shdr &Sec) const {
+ auto SectionsOrErr = sections();
+ if (!SectionsOrErr)
+ return SectionsOrErr.takeError();
+ return getStringTableForSymtab(Sec, *SectionsOrErr);
+}
+
+template <class ELFT>
+Expected<StringRef>
+ELFFile<ELFT>::getStringTableForSymtab(const Elf_Shdr &Sec,
+ Elf_Shdr_Range Sections) const {
+
+ if (Sec.sh_type != ELF::SHT_SYMTAB && Sec.sh_type != ELF::SHT_DYNSYM)
+ return createError(
+ "invalid sh_type for symbol table, expected SHT_SYMTAB or SHT_DYNSYM");
+ auto SectionOrErr = object::getSection<ELFT>(Sections, Sec.sh_link);
+ if (!SectionOrErr)
+ return SectionOrErr.takeError();
+ return getStringTable(*SectionOrErr);
+}
+
+template <class ELFT>
+Expected<StringRef>
+ELFFile<ELFT>::getSectionName(const Elf_Shdr *Section) const {
+ auto SectionsOrErr = sections();
+ if (!SectionsOrErr)
+ return SectionsOrErr.takeError();
+ auto Table = getSectionStringTable(*SectionsOrErr);
+ if (!Table)
+ return Table.takeError();
+ return getSectionName(Section, *Table);
+}
+
+template <class ELFT>
+Expected<StringRef> ELFFile<ELFT>::getSectionName(const Elf_Shdr *Section,
+ StringRef DotShstrtab) const {
+ uint32_t Offset = Section->sh_name;
+ if (Offset == 0)
+ return StringRef();
+ if (Offset >= DotShstrtab.size())
+ return createError("invalid string offset");
+ return StringRef(DotShstrtab.data() + Offset);
+}
+
+/// This function returns the hash value for a symbol in the .dynsym section
+/// Name of the API remains consistent as specified in the libelf
+/// REF : http://www.sco.com/developers/gabi/latest/ch5.dynamic.html#hash
+inline unsigned hashSysV(StringRef SymbolName) {
+ unsigned h = 0, g;
+ for (char C : SymbolName) {
+ h = (h << 4) + C;
+ g = h & 0xf0000000L;
+ if (g != 0)
+ h ^= g >> 24;
+ h &= ~g;
+ }
+ return h;
+}
+
+} // end namespace object
+} // end namespace llvm
+
+#endif // LLVM_OBJECT_ELF_H