#ifndef LLVM_OBJECT_ELF_H
#define LLVM_OBJECT_ELF_H
-#include "llvm/ADT/ArrayRef.h"
-#include "llvm/ADT/DenseMap.h"
-#include "llvm/ADT/PointerIntPair.h"
#include "llvm/ADT/SmallVector.h"
-#include "llvm/ADT/StringSwitch.h"
-#include "llvm/ADT/Triple.h"
#include "llvm/Object/ELFTypes.h"
-#include "llvm/Object/Error.h"
-#include "llvm/Support/Casting.h"
-#include "llvm/Support/ELF.h"
-#include "llvm/Support/Endian.h"
-#include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/ErrorOr.h"
#include "llvm/Support/MemoryBuffer.h"
-#include "llvm/Support/raw_ostream.h"
-#include <algorithm>
-#include <limits>
-#include <utility>
namespace llvm {
namespace object {
// Subclasses of ELFFile may need this for template instantiation
inline std::pair<unsigned char, unsigned char>
-getElfArchType(MemoryBuffer *Object) {
- if (Object->getBufferSize() < ELF::EI_NIDENT)
- return std::make_pair((uint8_t)ELF::ELFCLASSNONE,(uint8_t)ELF::ELFDATANONE);
- return std::make_pair((uint8_t) Object->getBufferStart()[ELF::EI_CLASS],
- (uint8_t) Object->getBufferStart()[ELF::EI_DATA]);
+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]);
}
template <class ELFT>
class ELFFile {
public:
LLVM_ELF_IMPORT_TYPES_ELFT(ELFT)
- typedef typename conditional<ELFT::Is64Bits,
- uint64_t, uint32_t>::type uintX_t;
-
- /// \brief Iterate over constant sized entities.
- template <class EntT>
- class ELFEntityIterator {
- public:
- typedef ptrdiff_t difference_type;
- typedef EntT value_type;
- typedef std::random_access_iterator_tag iterator_category;
- typedef value_type &reference;
- typedef value_type *pointer;
-
- /// \brief Default construct iterator.
- ELFEntityIterator() : EntitySize(0), Current(0) {}
- ELFEntityIterator(uintX_t EntSize, const char *Start)
- : EntitySize(EntSize), Current(Start) {}
-
- reference operator *() {
- assert(Current && "Attempted to dereference an invalid iterator!");
- return *reinterpret_cast<pointer>(Current);
- }
-
- pointer operator ->() {
- assert(Current && "Attempted to dereference an invalid iterator!");
- return reinterpret_cast<pointer>(Current);
- }
-
- bool operator ==(const ELFEntityIterator &Other) {
- return Current == Other.Current;
- }
-
- bool operator !=(const ELFEntityIterator &Other) {
- return !(*this == Other);
- }
-
- ELFEntityIterator &operator ++() {
- assert(Current && "Attempted to increment an invalid iterator!");
- Current += EntitySize;
- return *this;
- }
-
- ELFEntityIterator operator ++(int) {
- ELFEntityIterator Tmp = *this;
- ++*this;
- return Tmp;
- }
-
- ELFEntityIterator &operator =(const ELFEntityIterator &Other) {
- EntitySize = Other.EntitySize;
- Current = Other.Current;
- return *this;
- }
-
- difference_type operator -(const ELFEntityIterator &Other) const {
- assert(EntitySize == Other.EntitySize &&
- "Subtracting iterators of different EntitySize!");
- return (Current - Other.Current) / EntitySize;
- }
-
- const char *get() const { return Current; }
-
- uintX_t getEntSize() const { return EntitySize; }
-
- private:
- uintX_t EntitySize;
- const char *Current;
- };
+ typedef typename std::conditional<ELFT::Is64Bits,
+ uint64_t, uint32_t>::type uintX_t;
typedef Elf_Ehdr_Impl<ELFT> Elf_Ehdr;
typedef Elf_Shdr_Impl<ELFT> Elf_Shdr;
typedef Elf_Verneed_Impl<ELFT> Elf_Verneed;
typedef Elf_Vernaux_Impl<ELFT> Elf_Vernaux;
typedef Elf_Versym_Impl<ELFT> Elf_Versym;
- typedef ELFEntityIterator<const Elf_Dyn> Elf_Dyn_Iter;
- typedef ELFEntityIterator<const Elf_Rela> Elf_Rela_Iter;
- typedef ELFEntityIterator<const Elf_Rel> Elf_Rel_Iter;
- typedef ELFEntityIterator<const Elf_Shdr> Elf_Shdr_Iter;
+ typedef Elf_Hash_Impl<ELFT> Elf_Hash;
+ typedef Elf_GnuHash_Impl<ELFT> Elf_GnuHash;
+ typedef iterator_range<const Elf_Dyn *> Elf_Dyn_Range;
+ typedef iterator_range<const Elf_Shdr *> Elf_Shdr_Range;
+ typedef iterator_range<const Elf_Sym *> Elf_Sym_Range;
- /// \brief Archive files are 2 byte aligned, so we need this for
- /// PointerIntPair to work.
- template <typename T>
- class ArchivePointerTypeTraits {
- public:
- static inline const void *getAsVoidPointer(T *P) { return P; }
- static inline T *getFromVoidPointer(const void *P) {
- return static_cast<T *>(P);
- }
- enum { NumLowBitsAvailable = 1 };
- };
-
- class Elf_Sym_Iter {
- public:
- typedef ptrdiff_t difference_type;
- typedef const Elf_Sym value_type;
- typedef std::random_access_iterator_tag iterator_category;
- typedef value_type &reference;
- typedef value_type *pointer;
-
- /// \brief Default construct iterator.
- Elf_Sym_Iter() : EntitySize(0), Current(0, false) {}
- Elf_Sym_Iter(uintX_t EntSize, const char *Start, bool IsDynamic)
- : EntitySize(EntSize), Current(Start, IsDynamic) {}
-
- reference operator*() {
- assert(Current.getPointer() &&
- "Attempted to dereference an invalid iterator!");
- return *reinterpret_cast<pointer>(Current.getPointer());
- }
-
- pointer operator->() {
- assert(Current.getPointer() &&
- "Attempted to dereference an invalid iterator!");
- return reinterpret_cast<pointer>(Current.getPointer());
- }
-
- bool operator==(const Elf_Sym_Iter &Other) {
- return Current == Other.Current;
- }
-
- bool operator!=(const Elf_Sym_Iter &Other) { return !(*this == Other); }
-
- Elf_Sym_Iter &operator++() {
- assert(Current.getPointer() &&
- "Attempted to increment an invalid iterator!");
- Current.setPointer(Current.getPointer() + EntitySize);
- return *this;
- }
-
- Elf_Sym_Iter operator++(int) {
- Elf_Sym_Iter Tmp = *this;
- ++*this;
- return Tmp;
- }
-
- Elf_Sym_Iter operator+(difference_type Dist) {
- assert(Current.getPointer() &&
- "Attempted to increment an invalid iterator!");
- Current.setPointer(Current.getPointer() + EntitySize * Dist);
- return *this;
- }
-
- Elf_Sym_Iter &operator=(const Elf_Sym_Iter &Other) {
- EntitySize = Other.EntitySize;
- Current = Other.Current;
- return *this;
- }
-
- difference_type operator-(const Elf_Sym_Iter &Other) const {
- assert(EntitySize == Other.EntitySize &&
- "Subtracting iterators of different EntitySize!");
- return (Current.getPointer() - Other.Current.getPointer()) / EntitySize;
- }
-
- const char *get() const { return Current.getPointer(); }
-
- bool isDynamic() const { return Current.getInt(); }
-
- uintX_t getEntSize() const { return EntitySize; }
-
- private:
- uintX_t EntitySize;
- PointerIntPair<const char *, 1, bool,
- ArchivePointerTypeTraits<const char> > Current;
- };
+ const uint8_t *base() const {
+ return reinterpret_cast<const uint8_t *>(Buf.data());
+ }
private:
- typedef SmallVector<const Elf_Shdr *, 2> Sections_t;
- typedef DenseMap<unsigned, unsigned> IndexMap_t;
- MemoryBuffer *Buf;
-
- const uint8_t *base() const {
- return reinterpret_cast<const uint8_t *>(Buf->getBufferStart());
- }
+ StringRef Buf;
const Elf_Ehdr *Header;
- const Elf_Shdr *SectionHeaderTable;
- const Elf_Shdr *dot_shstrtab_sec; // Section header string table.
- const Elf_Shdr *dot_strtab_sec; // Symbol header string table.
- const Elf_Shdr *dot_symtab_sec; // Symbol table section.
-
- const Elf_Shdr *SymbolTableSectionHeaderIndex;
- DenseMap<const Elf_Sym *, ELF::Elf64_Word> ExtendedSymbolTable;
-
- const Elf_Shdr *dot_gnu_version_sec; // .gnu.version
- const Elf_Shdr *dot_gnu_version_r_sec; // .gnu.version_r
- const Elf_Shdr *dot_gnu_version_d_sec; // .gnu.version_d
-
- /// \brief Represents a region described by entries in the .dynamic table.
- struct DynRegionInfo {
- DynRegionInfo() : Addr(0), Size(0), EntSize(0) {}
- /// \brief Address in current address space.
- const void *Addr;
- /// \brief Size in bytes of the region.
- uintX_t Size;
- /// \brief Size of each entity in the region.
- uintX_t EntSize;
- };
-
- DynRegionInfo DynamicRegion;
- DynRegionInfo DynHashRegion;
- DynRegionInfo DynStrRegion;
- DynRegionInfo DynSymRegion;
-
- // Pointer to SONAME entry in dynamic string table
- // This is set the first time getLoadName is called.
- mutable const char *dt_soname;
-
- // Records for each version index the corresponding Verdef or Vernaux entry.
- // This is filled the first time LoadVersionMap() is called.
- class VersionMapEntry : public PointerIntPair<const void*, 1> {
- public:
- // If the integer is 0, this is an Elf_Verdef*.
- // If the integer is 1, this is an Elf_Vernaux*.
- VersionMapEntry() : PointerIntPair<const void*, 1>(NULL, 0) { }
- VersionMapEntry(const Elf_Verdef *verdef)
- : PointerIntPair<const void*, 1>(verdef, 0) { }
- VersionMapEntry(const Elf_Vernaux *vernaux)
- : PointerIntPair<const void*, 1>(vernaux, 1) { }
- bool isNull() const { return getPointer() == NULL; }
- bool isVerdef() const { return !isNull() && getInt() == 0; }
- bool isVernaux() const { return !isNull() && getInt() == 1; }
- const Elf_Verdef *getVerdef() const {
- return isVerdef() ? (const Elf_Verdef*)getPointer() : NULL;
- }
- const Elf_Vernaux *getVernaux() const {
- return isVernaux() ? (const Elf_Vernaux*)getPointer() : NULL;
- }
- };
- mutable SmallVector<VersionMapEntry, 16> VersionMap;
- void LoadVersionDefs(const Elf_Shdr *sec) const;
- void LoadVersionNeeds(const Elf_Shdr *ec) const;
- void LoadVersionMap() const;
+ const Elf_Shdr *SectionHeaderTable = nullptr;
+ StringRef DotShstrtab; // Section header string table.
public:
template<typename T>
const T *getEntry(uint32_t Section, uint32_t Entry) const;
template <typename T>
const T *getEntry(const Elf_Shdr *Section, uint32_t Entry) const;
- const char *getString(uint32_t section, uint32_t offset) const;
- const char *getString(const Elf_Shdr *section, uint32_t offset) const;
- const char *getDynamicString(uintX_t Offset) const;
- ErrorOr<StringRef> getSymbolVersion(const Elf_Shdr *section,
- const Elf_Sym *Symb,
- bool &IsDefault) const;
+
+ ErrorOr<StringRef> getStringTable(const Elf_Shdr *Section) const;
+ ErrorOr<StringRef> getStringTableForSymtab(const Elf_Shdr &Section) const;
+
+ ErrorOr<ArrayRef<Elf_Word>> getSHNDXTable(const Elf_Shdr &Section) const;
+
void VerifyStrTab(const Elf_Shdr *sh) const;
StringRef getRelocationTypeName(uint32_t Type) const;
void getRelocationTypeName(uint32_t Type,
SmallVectorImpl<char> &Result) const;
- /// \brief Get the symbol table section and symbol for a given relocation.
- template <class RelT>
- std::pair<const Elf_Shdr *, const Elf_Sym *>
- getRelocationSymbol(const Elf_Shdr *RelSec, const RelT *Rel) const;
+ /// \brief Get the symbol for a given relocation.
+ const Elf_Sym *getRelocationSymbol(const Elf_Rel *Rel,
+ const Elf_Shdr *SymTab) const;
- ELFFile(MemoryBuffer *Object, error_code &ec);
+ ELFFile(StringRef Object, std::error_code &EC);
+
+ bool isMipsELF64() const {
+ return Header->e_machine == ELF::EM_MIPS &&
+ Header->getFileClass() == ELF::ELFCLASS64;
+ }
bool isMips64EL() const {
return Header->e_machine == ELF::EM_MIPS &&
Header->getDataEncoding() == ELF::ELFDATA2LSB;
}
- Elf_Shdr_Iter begin_sections() const;
- Elf_Shdr_Iter end_sections() const;
+ ErrorOr<const Elf_Dyn *> dynamic_table_begin(const Elf_Phdr *Phdr) const;
+ ErrorOr<const Elf_Dyn *> dynamic_table_end(const Elf_Phdr *Phdr) const;
+ ErrorOr<Elf_Dyn_Range> dynamic_table(const Elf_Phdr *Phdr) const {
+ ErrorOr<const Elf_Dyn *> Begin = dynamic_table_begin(Phdr);
+ if (std::error_code EC = Begin.getError())
+ return EC;
+ ErrorOr<const Elf_Dyn *> End = dynamic_table_end(Phdr);
+ if (std::error_code EC = End.getError())
+ return EC;
+ return make_range(*Begin, *End);
+ }
- Elf_Sym_Iter begin_symbols() const;
- Elf_Sym_Iter end_symbols() const;
+ const Elf_Shdr *section_begin() const;
+ const Elf_Shdr *section_end() const;
+ Elf_Shdr_Range sections() const {
+ return make_range(section_begin(), section_end());
+ }
- Elf_Dyn_Iter begin_dynamic_table() const;
- /// \param NULLEnd use one past the first DT_NULL entry as the end instead of
- /// the section size.
- Elf_Dyn_Iter end_dynamic_table(bool NULLEnd = false) const;
+ const Elf_Sym *symbol_begin(const Elf_Shdr *Sec) const {
+ if (!Sec)
+ return nullptr;
+ if (Sec->sh_entsize != sizeof(Elf_Sym))
+ report_fatal_error("Invalid symbol size");
+ return reinterpret_cast<const Elf_Sym *>(base() + Sec->sh_offset);
+ }
+ const Elf_Sym *symbol_end(const Elf_Shdr *Sec) const {
+ if (!Sec)
+ return nullptr;
+ uint64_t Size = Sec->sh_size;
+ if (Size % sizeof(Elf_Sym))
+ report_fatal_error("Invalid symbol table size");
+ return symbol_begin(Sec) + Size / sizeof(Elf_Sym);
+ }
+ Elf_Sym_Range symbols(const Elf_Shdr *Sec) const {
+ return make_range(symbol_begin(Sec), symbol_end(Sec));
+ }
+
+ typedef iterator_range<const Elf_Rela *> Elf_Rela_Range;
- Elf_Sym_Iter begin_dynamic_symbols() const {
- if (DynSymRegion.Addr)
- return Elf_Sym_Iter(DynSymRegion.EntSize, (const char *)DynSymRegion.Addr,
- true);
- return Elf_Sym_Iter(0, 0, true);
+ const Elf_Rela *rela_begin(const Elf_Shdr *sec) const {
+ if (sec->sh_entsize != sizeof(Elf_Rela))
+ report_fatal_error("Invalid relocation entry size");
+ return reinterpret_cast<const Elf_Rela *>(base() + sec->sh_offset);
}
- Elf_Sym_Iter end_dynamic_symbols() const {
- if (DynSymRegion.Addr)
- return Elf_Sym_Iter(DynSymRegion.EntSize,
- (const char *)DynSymRegion.Addr + DynSymRegion.Size,
- true);
- return Elf_Sym_Iter(0, 0, true);
+ const Elf_Rela *rela_end(const Elf_Shdr *sec) const {
+ uint64_t Size = sec->sh_size;
+ if (Size % sizeof(Elf_Rela))
+ report_fatal_error("Invalid relocation table size");
+ return rela_begin(sec) + Size / sizeof(Elf_Rela);
}
- Elf_Rela_Iter begin_rela(const Elf_Shdr *sec) const {
- return Elf_Rela_Iter(sec->sh_entsize,
- (const char *)(base() + sec->sh_offset));
+ Elf_Rela_Range relas(const Elf_Shdr *Sec) const {
+ return make_range(rela_begin(Sec), rela_end(Sec));
}
- Elf_Rela_Iter end_rela(const Elf_Shdr *sec) const {
- return Elf_Rela_Iter(
- sec->sh_entsize,
- (const char *)(base() + sec->sh_offset + sec->sh_size));
+ const Elf_Rel *rel_begin(const Elf_Shdr *sec) const {
+ if (sec->sh_entsize != sizeof(Elf_Rel))
+ report_fatal_error("Invalid relocation entry size");
+ return reinterpret_cast<const Elf_Rel *>(base() + sec->sh_offset);
}
- Elf_Rel_Iter begin_rel(const Elf_Shdr *sec) const {
- return Elf_Rel_Iter(sec->sh_entsize,
- (const char *)(base() + sec->sh_offset));
+ const Elf_Rel *rel_end(const Elf_Shdr *sec) const {
+ uint64_t Size = sec->sh_size;
+ if (Size % sizeof(Elf_Rel))
+ report_fatal_error("Invalid relocation table size");
+ return rel_begin(sec) + Size / sizeof(Elf_Rel);
}
- Elf_Rel_Iter end_rel(const Elf_Shdr *sec) const {
- return Elf_Rel_Iter(sec->sh_entsize,
- (const char *)(base() + sec->sh_offset + sec->sh_size));
+ typedef iterator_range<const Elf_Rel *> Elf_Rel_Range;
+ Elf_Rel_Range rels(const Elf_Shdr *Sec) const {
+ return make_range(rel_begin(Sec), rel_end(Sec));
}
/// \brief Iterate over program header table.
- typedef ELFEntityIterator<const Elf_Phdr> Elf_Phdr_Iter;
+ const Elf_Phdr *program_header_begin() const {
+ if (Header->e_phnum && Header->e_phentsize != sizeof(Elf_Phdr))
+ report_fatal_error("Invalid program header size");
+ return reinterpret_cast<const Elf_Phdr *>(base() + Header->e_phoff);
+ }
- Elf_Phdr_Iter begin_program_headers() const {
- return Elf_Phdr_Iter(Header->e_phentsize,
- (const char*)base() + Header->e_phoff);
+ const Elf_Phdr *program_header_end() const {
+ return program_header_begin() + Header->e_phnum;
}
- Elf_Phdr_Iter end_program_headers() const {
- return Elf_Phdr_Iter(Header->e_phentsize,
- (const char*)base() +
- Header->e_phoff +
- (Header->e_phnum * Header->e_phentsize));
+ typedef iterator_range<const Elf_Phdr *> Elf_Phdr_Range;
+
+ const Elf_Phdr_Range program_headers() const {
+ return make_range(program_header_begin(), program_header_end());
}
uint64_t getNumSections() const;
uintX_t getStringTableIndex() const;
- ELF::Elf64_Word getSymbolTableIndex(const Elf_Sym *symb) const;
+ uint32_t getExtendedSymbolTableIndex(const Elf_Sym *Sym,
+ const Elf_Shdr *SymTab,
+ ArrayRef<Elf_Word> ShndxTable) const;
const Elf_Ehdr *getHeader() const { return Header; }
- const Elf_Shdr *getSection(const Elf_Sym *symb) const;
- const Elf_Shdr *getSection(uint32_t Index) const;
- const Elf_Sym *getSymbol(uint32_t index) const;
-
- ErrorOr<StringRef> getSymbolName(Elf_Sym_Iter Sym) const;
-
- /// \brief Get the name of \p Symb.
- /// \param SymTab The symbol table section \p Symb is contained in.
- /// \param Symb The symbol to get the name of.
- ///
- /// \p SymTab is used to lookup the string table to use to get the symbol's
- /// name.
- ErrorOr<StringRef> getSymbolName(const Elf_Shdr *SymTab,
- const Elf_Sym *Symb) const;
+ ErrorOr<const Elf_Shdr *> getSection(const Elf_Sym *Sym,
+ const Elf_Shdr *SymTab,
+ ArrayRef<Elf_Word> ShndxTable) const;
+ ErrorOr<const Elf_Shdr *> getSection(uint32_t Index) const;
+
+ const Elf_Sym *getSymbol(const Elf_Shdr *Sec, uint32_t Index) const {
+ return &*(symbol_begin(Sec) + Index);
+ }
+
ErrorOr<StringRef> getSectionName(const Elf_Shdr *Section) const;
- uint64_t getSymbolIndex(const Elf_Sym *sym) const;
+ template <typename T>
+ ErrorOr<ArrayRef<T>> getSectionContentsAsArray(const Elf_Shdr *Sec) const;
ErrorOr<ArrayRef<uint8_t> > getSectionContents(const Elf_Shdr *Sec) const;
- StringRef getLoadName() const;
};
-// Use an alignment of 2 for the typedefs since that is the worst case for
-// ELF files in archives.
-typedef ELFFile<ELFType<support::little, 2, false> > ELF32LEFile;
-typedef ELFFile<ELFType<support::little, 2, true> > ELF64LEFile;
-typedef ELFFile<ELFType<support::big, 2, false> > ELF32BEFile;
-typedef ELFFile<ELFType<support::big, 2, true> > ELF64BEFile;
+typedef ELFFile<ELFType<support::little, false>> ELF32LEFile;
+typedef ELFFile<ELFType<support::little, true>> ELF64LEFile;
+typedef ELFFile<ELFType<support::big, false>> ELF32BEFile;
+typedef ELFFile<ELFType<support::big, true>> ELF64BEFile;
-// Iterate through the version definitions, and place each Elf_Verdef
-// in the VersionMap according to its index.
template <class ELFT>
-void ELFFile<ELFT>::LoadVersionDefs(const Elf_Shdr *sec) const {
- unsigned vd_size = sec->sh_size; // Size of section in bytes
- unsigned vd_count = sec->sh_info; // Number of Verdef entries
- const char *sec_start = (const char*)base() + sec->sh_offset;
- const char *sec_end = sec_start + vd_size;
- // The first Verdef entry is at the start of the section.
- const char *p = sec_start;
- for (unsigned i = 0; i < vd_count; i++) {
- if (p + sizeof(Elf_Verdef) > sec_end)
- report_fatal_error("Section ended unexpectedly while scanning "
- "version definitions.");
- const Elf_Verdef *vd = reinterpret_cast<const Elf_Verdef *>(p);
- if (vd->vd_version != ELF::VER_DEF_CURRENT)
- report_fatal_error("Unexpected verdef version");
- size_t index = vd->vd_ndx & ELF::VERSYM_VERSION;
- if (index >= VersionMap.size())
- VersionMap.resize(index + 1);
- VersionMap[index] = VersionMapEntry(vd);
- p += vd->vd_next;
- }
-}
+uint32_t ELFFile<ELFT>::getExtendedSymbolTableIndex(
+ const Elf_Sym *Sym, const Elf_Shdr *SymTab,
+ ArrayRef<Elf_Word> ShndxTable) const {
+ assert(Sym->st_shndx == ELF::SHN_XINDEX);
+ unsigned Index = Sym - symbol_begin(SymTab);
-// Iterate through the versions needed section, and place each Elf_Vernaux
-// in the VersionMap according to its index.
-template <class ELFT>
-void ELFFile<ELFT>::LoadVersionNeeds(const Elf_Shdr *sec) const {
- unsigned vn_size = sec->sh_size; // Size of section in bytes
- unsigned vn_count = sec->sh_info; // Number of Verneed entries
- const char *sec_start = (const char *)base() + sec->sh_offset;
- const char *sec_end = sec_start + vn_size;
- // The first Verneed entry is at the start of the section.
- const char *p = sec_start;
- for (unsigned i = 0; i < vn_count; i++) {
- if (p + sizeof(Elf_Verneed) > sec_end)
- report_fatal_error("Section ended unexpectedly while scanning "
- "version needed records.");
- const Elf_Verneed *vn = reinterpret_cast<const Elf_Verneed *>(p);
- if (vn->vn_version != ELF::VER_NEED_CURRENT)
- report_fatal_error("Unexpected verneed version");
- // Iterate through the Vernaux entries
- const char *paux = p + vn->vn_aux;
- for (unsigned j = 0; j < vn->vn_cnt; j++) {
- if (paux + sizeof(Elf_Vernaux) > sec_end)
- report_fatal_error("Section ended unexpected while scanning auxiliary "
- "version needed records.");
- const Elf_Vernaux *vna = reinterpret_cast<const Elf_Vernaux *>(paux);
- size_t index = vna->vna_other & ELF::VERSYM_VERSION;
- if (index >= VersionMap.size())
- VersionMap.resize(index + 1);
- VersionMap[index] = VersionMapEntry(vna);
- paux += vna->vna_next;
- }
- p += vn->vn_next;
- }
+ // The size of the table was checked in getSHNDXTable.
+ return ShndxTable[Index];
}
template <class ELFT>
-void ELFFile<ELFT>::LoadVersionMap() const {
- // If there is no dynamic symtab or version table, there is nothing to do.
- if (DynSymRegion.Addr == NULL || dot_gnu_version_sec == NULL)
- return;
-
- // Has the VersionMap already been loaded?
- if (VersionMap.size() > 0)
- return;
+ErrorOr<const typename ELFFile<ELFT>::Elf_Shdr *>
+ELFFile<ELFT>::getSection(const Elf_Sym *Sym, const Elf_Shdr *SymTab,
+ ArrayRef<Elf_Word> ShndxTable) const {
+ uint32_t Index = Sym->st_shndx;
+ if (Index == ELF::SHN_XINDEX)
+ return getSection(getExtendedSymbolTableIndex(Sym, SymTab, ShndxTable));
- // The first two version indexes are reserved.
- // Index 0 is LOCAL, index 1 is GLOBAL.
- VersionMap.push_back(VersionMapEntry());
- VersionMap.push_back(VersionMapEntry());
-
- if (dot_gnu_version_d_sec)
- LoadVersionDefs(dot_gnu_version_d_sec);
-
- if (dot_gnu_version_r_sec)
- LoadVersionNeeds(dot_gnu_version_r_sec);
+ if (Index == ELF::SHN_UNDEF || Index >= ELF::SHN_LORESERVE)
+ return nullptr;
+ return getSection(Sym->st_shndx);
}
template <class ELFT>
-ELF::Elf64_Word ELFFile<ELFT>::getSymbolTableIndex(const Elf_Sym *symb) const {
- if (symb->st_shndx == ELF::SHN_XINDEX)
- return ExtendedSymbolTable.lookup(symb);
- return symb->st_shndx;
-}
+template <typename T>
+ErrorOr<ArrayRef<T>>
+ELFFile<ELFT>::getSectionContentsAsArray(const Elf_Shdr *Sec) const {
+ uintX_t Offset = Sec->sh_offset;
+ uintX_t Size = Sec->sh_size;
-template <class ELFT>
-const typename ELFFile<ELFT>::Elf_Shdr *
-ELFFile<ELFT>::getSection(const Elf_Sym *symb) const {
- if (symb->st_shndx == ELF::SHN_XINDEX)
- return getSection(ExtendedSymbolTable.lookup(symb));
- if (symb->st_shndx >= ELF::SHN_LORESERVE)
- return 0;
- return getSection(symb->st_shndx);
-}
+ if (Size % sizeof(T))
+ return object_error::parse_failed;
+ if (Offset + Size > Buf.size())
+ return object_error::parse_failed;
-template <class ELFT>
-const typename ELFFile<ELFT>::Elf_Sym *
-ELFFile<ELFT>::getSymbol(uint32_t Index) const {
- return &*(begin_symbols() + Index);
+ const T *Start = reinterpret_cast<const T *>(base() + Offset);
+ return makeArrayRef(Start, Size / sizeof(T));
}
template <class ELFT>
-ErrorOr<ArrayRef<uint8_t> >
+ErrorOr<ArrayRef<uint8_t>>
ELFFile<ELFT>::getSectionContents(const Elf_Shdr *Sec) const {
- if (Sec->sh_offset + Sec->sh_size > Buf->getBufferSize())
- return object_error::parse_failed;
- const uint8_t *Start = base() + Sec->sh_offset;
- return ArrayRef<uint8_t>(Start, Sec->sh_size);
+ return getSectionContentsAsArray<uint8_t>(Sec);
}
template <class ELFT>
template <class ELFT>
void ELFFile<ELFT>::getRelocationTypeName(uint32_t Type,
SmallVectorImpl<char> &Result) const {
- if (!isMips64EL()) {
+ 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;
}
template <class ELFT>
-template <class RelT>
-std::pair<const typename ELFFile<ELFT>::Elf_Shdr *,
- const typename ELFFile<ELFT>::Elf_Sym *>
-ELFFile<ELFT>::getRelocationSymbol(const Elf_Shdr *Sec, const RelT *Rel) const {
- if (!Sec->sh_link)
- return std::make_pair((const Elf_Shdr *)0, (const Elf_Sym *)0);
- const Elf_Shdr *SymTable = getSection(Sec->sh_link);
- return std::make_pair(
- SymTable, getEntry<Elf_Sym>(SymTable, Rel->getSymbol(isMips64EL())));
-}
-
-// Verify that the last byte in the string table in a null.
-template <class ELFT>
-void ELFFile<ELFT>::VerifyStrTab(const Elf_Shdr *sh) const {
- const char *strtab = (const char *)base() + sh->sh_offset;
- if (strtab[sh->sh_size - 1] != 0)
- // FIXME: Proper error handling.
- report_fatal_error("String table must end with a null terminator!");
+const typename ELFFile<ELFT>::Elf_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>
uint64_t ELFFile<ELFT>::getNumSections() const {
assert(Header && "Header not initialized!");
- if (Header->e_shnum == ELF::SHN_UNDEF) {
+ if (Header->e_shnum == ELF::SHN_UNDEF && Header->e_shoff > 0) {
assert(SectionHeaderTable && "SectionHeaderTable not initialized!");
return SectionHeaderTable->sh_size;
}
}
template <class ELFT>
-ELFFile<ELFT>::ELFFile(MemoryBuffer *Object, error_code &ec)
- : Buf(Object),
- SectionHeaderTable(0),
- dot_shstrtab_sec(0),
- dot_strtab_sec(0),
- dot_symtab_sec(0),
- SymbolTableSectionHeaderIndex(0),
- dot_gnu_version_sec(0),
- dot_gnu_version_r_sec(0),
- dot_gnu_version_d_sec(0),
- dt_soname(0) {
- const uint64_t FileSize = Buf->getBufferSize();
-
- if (sizeof(Elf_Ehdr) > FileSize)
- // FIXME: Proper error handling.
- report_fatal_error("File too short!");
+ELFFile<ELFT>::ELFFile(StringRef Object, std::error_code &EC)
+ : Buf(Object) {
+ const uint64_t FileSize = Buf.size();
+
+ if (sizeof(Elf_Ehdr) > FileSize) {
+ // File too short!
+ EC = object_error::parse_failed;
+ return;
+ }
Header = reinterpret_cast<const Elf_Ehdr *>(base());
const uint64_t SectionTableOffset = Header->e_shoff;
- if (SectionTableOffset + sizeof(Elf_Shdr) > FileSize)
- // FIXME: Proper error handling.
- report_fatal_error("Section header table goes past end of file!");
+ if (SectionTableOffset + sizeof(Elf_Shdr) > FileSize) {
+ // Section header table goes past end of file!
+ EC = object_error::parse_failed;
+ return;
+ }
// The getNumSections() call below depends on SectionHeaderTable being set.
SectionHeaderTable =
reinterpret_cast<const Elf_Shdr *>(base() + SectionTableOffset);
const uint64_t SectionTableSize = getNumSections() * Header->e_shentsize;
- if (SectionTableOffset + SectionTableSize > FileSize)
- // FIXME: Proper error handling.
- report_fatal_error("Section table goes past end of file!");
-
- // Scan sections for special sections.
-
- for (Elf_Shdr_Iter SecI = begin_sections(), SecE = end_sections();
- SecI != SecE; ++SecI) {
- switch (SecI->sh_type) {
- case ELF::SHT_SYMTAB_SHNDX:
- if (SymbolTableSectionHeaderIndex)
- // FIXME: Proper error handling.
- report_fatal_error("More than one .symtab_shndx!");
- SymbolTableSectionHeaderIndex = &*SecI;
- break;
- case ELF::SHT_SYMTAB:
- if (dot_symtab_sec)
- // FIXME: Proper error handling.
- report_fatal_error("More than one .symtab!");
- dot_symtab_sec = &*SecI;
- dot_strtab_sec = getSection(SecI->sh_link);
- break;
- case ELF::SHT_DYNSYM: {
- if (DynSymRegion.Addr)
- // FIXME: Proper error handling.
- report_fatal_error("More than one .dynsym!");
- DynSymRegion.Addr = base() + SecI->sh_offset;
- DynSymRegion.Size = SecI->sh_size;
- DynSymRegion.EntSize = SecI->sh_entsize;
- const Elf_Shdr *DynStr = getSection(SecI->sh_link);
- DynStrRegion.Addr = base() + DynStr->sh_offset;
- DynStrRegion.Size = DynStr->sh_size;
- DynStrRegion.EntSize = DynStr->sh_entsize;
- break;
- }
- case ELF::SHT_DYNAMIC:
- if (DynamicRegion.Addr)
- // FIXME: Proper error handling.
- report_fatal_error("More than one .dynamic!");
- DynamicRegion.Addr = base() + SecI->sh_offset;
- DynamicRegion.Size = SecI->sh_size;
- DynamicRegion.EntSize = SecI->sh_entsize;
- break;
- case ELF::SHT_GNU_versym:
- if (dot_gnu_version_sec != NULL)
- // FIXME: Proper error handling.
- report_fatal_error("More than one .gnu.version section!");
- dot_gnu_version_sec = &*SecI;
- break;
- case ELF::SHT_GNU_verdef:
- if (dot_gnu_version_d_sec != NULL)
- // FIXME: Proper error handling.
- report_fatal_error("More than one .gnu.version_d section!");
- dot_gnu_version_d_sec = &*SecI;
- break;
- case ELF::SHT_GNU_verneed:
- if (dot_gnu_version_r_sec != NULL)
- // FIXME: Proper error handling.
- report_fatal_error("More than one .gnu.version_r section!");
- dot_gnu_version_r_sec = &*SecI;
- break;
- }
+ if (SectionTableOffset + SectionTableSize > FileSize) {
+ // Section table goes past end of file!
+ EC = object_error::parse_failed;
+ return;
}
// Get string table sections.
- dot_shstrtab_sec = getSection(getStringTableIndex());
- if (dot_shstrtab_sec) {
- // Verify that the last byte in the string table in a null.
- VerifyStrTab(dot_shstrtab_sec);
+ uintX_t StringTableIndex = getStringTableIndex();
+ if (StringTableIndex) {
+ ErrorOr<const Elf_Shdr *> StrTabSecOrErr = getSection(StringTableIndex);
+ if ((EC = StrTabSecOrErr.getError()))
+ return;
+
+ ErrorOr<StringRef> StringTableOrErr = getStringTable(*StrTabSecOrErr);
+ if ((EC = StringTableOrErr.getError()))
+ return;
+ DotShstrtab = *StringTableOrErr;
}
- // Build symbol name side-mapping if there is one.
- if (SymbolTableSectionHeaderIndex) {
- const Elf_Word *ShndxTable = reinterpret_cast<const Elf_Word*>(base() +
- SymbolTableSectionHeaderIndex->sh_offset);
- for (Elf_Sym_Iter SI = begin_symbols(), SE = end_symbols(); SI != SE;
- ++SI) {
- if (*ShndxTable != ELF::SHN_UNDEF)
- ExtendedSymbolTable[&*SI] = *ShndxTable;
- ++ShndxTable;
- }
- }
-
- // Scan program headers.
- for (Elf_Phdr_Iter PhdrI = begin_program_headers(),
- PhdrE = end_program_headers();
- PhdrI != PhdrE; ++PhdrI) {
- if (PhdrI->p_type == ELF::PT_DYNAMIC) {
- DynamicRegion.Addr = base() + PhdrI->p_offset;
- DynamicRegion.Size = PhdrI->p_filesz;
- DynamicRegion.EntSize = sizeof(Elf_Dyn);
- break;
- }
- }
-
- ec = error_code::success();
-}
-
-// Get the symbol table index in the symtab section given a symbol
-template <class ELFT>
-uint64_t ELFFile<ELFT>::getSymbolIndex(const Elf_Sym *Sym) const {
- uintptr_t SymLoc = uintptr_t(Sym);
- uintptr_t SymTabLoc = uintptr_t(base() + dot_symtab_sec->sh_offset);
- assert(SymLoc > SymTabLoc && "Symbol not in symbol table!");
- uint64_t SymOffset = SymLoc - SymTabLoc;
- assert(SymOffset % dot_symtab_sec->sh_entsize == 0 &&
- "Symbol not multiple of symbol size!");
- return SymOffset / dot_symtab_sec->sh_entsize;
+ EC = std::error_code();
}
template <class ELFT>
-typename ELFFile<ELFT>::Elf_Shdr_Iter ELFFile<ELFT>::begin_sections() const {
- return Elf_Shdr_Iter(Header->e_shentsize,
- (const char *)base() + Header->e_shoff);
+static bool compareAddr(uint64_t VAddr, const Elf_Phdr_Impl<ELFT> *Phdr) {
+ return VAddr < Phdr->p_vaddr;
}
template <class ELFT>
-typename ELFFile<ELFT>::Elf_Shdr_Iter ELFFile<ELFT>::end_sections() const {
- return Elf_Shdr_Iter(Header->e_shentsize,
- (const char *)base() + Header->e_shoff +
- (getNumSections() * Header->e_shentsize));
+const typename ELFFile<ELFT>::Elf_Shdr *ELFFile<ELFT>::section_begin() const {
+ if (Header->e_shentsize != sizeof(Elf_Shdr))
+ report_fatal_error(
+ "Invalid section header entry size (e_shentsize) in ELF header");
+ return reinterpret_cast<const Elf_Shdr *>(base() + Header->e_shoff);
}
template <class ELFT>
-typename ELFFile<ELFT>::Elf_Sym_Iter ELFFile<ELFT>::begin_symbols() const {
- if (!dot_symtab_sec)
- return Elf_Sym_Iter(0, 0, false);
- return Elf_Sym_Iter(dot_symtab_sec->sh_entsize,
- (const char *)base() + dot_symtab_sec->sh_offset, false);
+const typename ELFFile<ELFT>::Elf_Shdr *ELFFile<ELFT>::section_end() const {
+ return section_begin() + getNumSections();
}
template <class ELFT>
-typename ELFFile<ELFT>::Elf_Sym_Iter ELFFile<ELFT>::end_symbols() const {
- if (!dot_symtab_sec)
- return Elf_Sym_Iter(0, 0, false);
- return Elf_Sym_Iter(dot_symtab_sec->sh_entsize,
- (const char *)base() + dot_symtab_sec->sh_offset +
- dot_symtab_sec->sh_size,
- false);
-}
-
-template <class ELFT>
-typename ELFFile<ELFT>::Elf_Dyn_Iter
-ELFFile<ELFT>::begin_dynamic_table() const {
- if (DynamicRegion.Addr)
- return Elf_Dyn_Iter(DynamicRegion.EntSize,
- (const char *)DynamicRegion.Addr);
- return Elf_Dyn_Iter(0, 0);
-}
-
-template <class ELFT>
-typename ELFFile<ELFT>::Elf_Dyn_Iter
-ELFFile<ELFT>::end_dynamic_table(bool NULLEnd) const {
- if (!DynamicRegion.Addr)
- return Elf_Dyn_Iter(0, 0);
- Elf_Dyn_Iter Ret(DynamicRegion.EntSize,
- (const char *)DynamicRegion.Addr + DynamicRegion.Size);
-
- if (NULLEnd) {
- Elf_Dyn_Iter Start = begin_dynamic_table();
- while (Start != Ret && Start->getTag() != ELF::DT_NULL)
- ++Start;
-
- // Include the DT_NULL.
- if (Start != Ret)
- ++Start;
- Ret = Start;
- }
- return Ret;
+ErrorOr<const typename ELFFile<ELFT>::Elf_Dyn *>
+ELFFile<ELFT>::dynamic_table_begin(const Elf_Phdr *Phdr) const {
+ if (!Phdr)
+ return nullptr;
+ assert(Phdr->p_type == ELF::PT_DYNAMIC && "Got the wrong program header");
+ uintX_t Offset = Phdr->p_offset;
+ if (Offset > Buf.size())
+ return object_error::parse_failed;
+ return reinterpret_cast<const Elf_Dyn *>(base() + Offset);
}
template <class ELFT>
-StringRef ELFFile<ELFT>::getLoadName() const {
- if (!dt_soname) {
- // Find the DT_SONAME entry
- Elf_Dyn_Iter it = begin_dynamic_table();
- Elf_Dyn_Iter ie = end_dynamic_table();
- while (it != ie && it->getTag() != ELF::DT_SONAME)
- ++it;
-
- if (it != ie) {
- dt_soname = getDynamicString(it->getVal());
- } else {
- dt_soname = "";
- }
- }
- return dt_soname;
+ErrorOr<const typename ELFFile<ELFT>::Elf_Dyn *>
+ELFFile<ELFT>::dynamic_table_end(const Elf_Phdr *Phdr) const {
+ if (!Phdr)
+ return nullptr;
+ assert(Phdr->p_type == ELF::PT_DYNAMIC && "Got the wrong program header");
+ uintX_t Size = Phdr->p_filesz;
+ if (Size % sizeof(Elf_Dyn))
+ return object_error::elf_invalid_dynamic_table_size;
+ // FIKME: Check for overflow?
+ uintX_t End = Phdr->p_offset + Size;
+ if (End > Buf.size())
+ return object_error::parse_failed;
+ return reinterpret_cast<const Elf_Dyn *>(base() + End);
}
template <class ELFT>
template <typename T>
const T *ELFFile<ELFT>::getEntry(uint32_t Section, uint32_t Entry) const {
- return getEntry<T>(getSection(Section), Entry);
+ ErrorOr<const Elf_Shdr *> Sec = getSection(Section);
+ if (std::error_code EC = Sec.getError())
+ report_fatal_error(EC.message());
+ return getEntry<T>(*Sec, Entry);
}
template <class ELFT>
}
template <class ELFT>
-const typename ELFFile<ELFT>::Elf_Shdr *
-ELFFile<ELFT>::getSection(uint32_t index) const {
- if (index == 0)
- return 0;
- if (!SectionHeaderTable || index >= getNumSections())
- // FIXME: Proper error handling.
- report_fatal_error("Invalid section index!");
+ErrorOr<const typename ELFFile<ELFT>::Elf_Shdr *>
+ELFFile<ELFT>::getSection(uint32_t Index) const {
+ assert(SectionHeaderTable && "SectionHeaderTable not initialized!");
+ if (Index >= getNumSections())
+ return object_error::invalid_section_index;
return reinterpret_cast<const Elf_Shdr *>(
- reinterpret_cast<const char *>(SectionHeaderTable)
- + (index * Header->e_shentsize));
+ reinterpret_cast<const char *>(SectionHeaderTable) +
+ (Index * Header->e_shentsize));
}
template <class ELFT>
-const char *ELFFile<ELFT>::getString(uint32_t section,
- ELF::Elf32_Word offset) const {
- return getString(getSection(section), offset);
-}
-
-template <class ELFT>
-const char *ELFFile<ELFT>::getString(const Elf_Shdr *section,
- ELF::Elf32_Word offset) const {
- assert(section && section->sh_type == ELF::SHT_STRTAB && "Invalid section!");
- if (offset >= section->sh_size)
- // FIXME: Proper error handling.
- report_fatal_error("Symbol name offset outside of string table!");
- return (const char *)base() + section->sh_offset + offset;
-}
-
-template <class ELFT>
-const char *ELFFile<ELFT>::getDynamicString(uintX_t Offset) const {
- if (!DynStrRegion.Addr || Offset >= DynStrRegion.Size)
- return 0;
- return (const char *)DynStrRegion.Addr + Offset;
-}
-
-template <class ELFT>
-ErrorOr<StringRef> ELFFile<ELFT>::getSymbolName(Elf_Sym_Iter Sym) const {
- if (!Sym.isDynamic())
- return getSymbolName(dot_symtab_sec, &*Sym);
-
- if (!DynStrRegion.Addr || Sym->st_name >= DynStrRegion.Size)
+ErrorOr<StringRef>
+ELFFile<ELFT>::getStringTable(const Elf_Shdr *Section) const {
+ if (Section->sh_type != ELF::SHT_STRTAB)
+ return object_error::parse_failed;
+ uint64_t Offset = Section->sh_offset;
+ uint64_t Size = Section->sh_size;
+ if (Offset + Size > Buf.size())
return object_error::parse_failed;
- return StringRef(getDynamicString(Sym->st_name));
+ StringRef Data((const char *)base() + Section->sh_offset, Size);
+ if (Data[Size - 1] != '\0')
+ return object_error::string_table_non_null_end;
+ return Data;
}
template <class ELFT>
-ErrorOr<StringRef> ELFFile<ELFT>::getSymbolName(const Elf_Shdr *Section,
- const Elf_Sym *Symb) const {
- if (Symb->st_name == 0) {
- const Elf_Shdr *ContainingSec = getSection(Symb);
- if (ContainingSec)
- return getSectionName(ContainingSec);
- }
-
- const Elf_Shdr *StrTab = getSection(Section->sh_link);
- if (Symb->st_name >= StrTab->sh_size)
+ErrorOr<ArrayRef<typename ELFFile<ELFT>::Elf_Word>>
+ELFFile<ELFT>::getSHNDXTable(const Elf_Shdr &Section) const {
+ assert(Section.sh_type == ELF::SHT_SYMTAB_SHNDX);
+ const Elf_Word *ShndxTableBegin =
+ reinterpret_cast<const Elf_Word *>(base() + Section.sh_offset);
+ uintX_t Size = Section.sh_size;
+ if (Size % sizeof(uint32_t))
+ return object_error::parse_failed;
+ uintX_t NumSymbols = Size / sizeof(uint32_t);
+ const Elf_Word *ShndxTableEnd = ShndxTableBegin + NumSymbols;
+ if (reinterpret_cast<const char *>(ShndxTableEnd) > Buf.end())
+ return object_error::parse_failed;
+ ErrorOr<const Elf_Shdr *> SymTableOrErr = getSection(Section.sh_link);
+ if (std::error_code EC = SymTableOrErr.getError())
+ return EC;
+ const Elf_Shdr &SymTable = **SymTableOrErr;
+ if (SymTable.sh_type != ELF::SHT_SYMTAB &&
+ SymTable.sh_type != ELF::SHT_DYNSYM)
+ return object_error::parse_failed;
+ if (NumSymbols != (SymTable.sh_size / sizeof(Elf_Sym)))
return object_error::parse_failed;
- return StringRef(getString(StrTab, Symb->st_name));
+ return makeArrayRef(ShndxTableBegin, ShndxTableEnd);
}
template <class ELFT>
ErrorOr<StringRef>
-ELFFile<ELFT>::getSectionName(const Elf_Shdr *Section) const {
- if (Section->sh_name >= dot_shstrtab_sec->sh_size)
+ELFFile<ELFT>::getStringTableForSymtab(const Elf_Shdr &Sec) const {
+ if (Sec.sh_type != ELF::SHT_SYMTAB && Sec.sh_type != ELF::SHT_DYNSYM)
return object_error::parse_failed;
- return StringRef(getString(dot_shstrtab_sec, Section->sh_name));
+ ErrorOr<const Elf_Shdr *> SectionOrErr = getSection(Sec.sh_link);
+ if (std::error_code EC = SectionOrErr.getError())
+ return EC;
+ return getStringTable(*SectionOrErr);
}
template <class ELFT>
-ErrorOr<StringRef> ELFFile<ELFT>::getSymbolVersion(const Elf_Shdr *section,
- const Elf_Sym *symb,
- bool &IsDefault) const {
- // Handle non-dynamic symbols.
- if (section != DynSymRegion.Addr && section != 0) {
- // Non-dynamic symbols can have versions in their names
- // A name of the form 'foo@V1' indicates version 'V1', non-default.
- // A name of the form 'foo@@V2' indicates version 'V2', default version.
- ErrorOr<StringRef> SymName = getSymbolName(section, symb);
- if (!SymName)
- return SymName;
- StringRef Name = *SymName;
- size_t atpos = Name.find('@');
- if (atpos == StringRef::npos) {
- IsDefault = false;
- return StringRef("");
- }
- ++atpos;
- if (atpos < Name.size() && Name[atpos] == '@') {
- IsDefault = true;
- ++atpos;
- } else {
- IsDefault = false;
- }
- return Name.substr(atpos);
- }
-
- // This is a dynamic symbol. Look in the GNU symbol version table.
- if (dot_gnu_version_sec == NULL) {
- // No version table.
- IsDefault = false;
- return StringRef("");
- }
-
- // Determine the position in the symbol table of this entry.
- size_t entry_index = ((const char *)symb - (const char *)DynSymRegion.Addr) /
- DynSymRegion.EntSize;
-
- // Get the corresponding version index entry
- const Elf_Versym *vs = getEntry<Elf_Versym>(dot_gnu_version_sec, entry_index);
- size_t version_index = vs->vs_index & ELF::VERSYM_VERSION;
-
- // Special markers for unversioned symbols.
- if (version_index == ELF::VER_NDX_LOCAL ||
- version_index == ELF::VER_NDX_GLOBAL) {
- IsDefault = false;
- return StringRef("");
- }
-
- // Lookup this symbol in the version table
- LoadVersionMap();
- if (version_index >= VersionMap.size() || VersionMap[version_index].isNull())
- return object_error::parse_failed;
- const VersionMapEntry &entry = VersionMap[version_index];
-
- // Get the version name string
- size_t name_offset;
- if (entry.isVerdef()) {
- // The first Verdaux entry holds the name.
- name_offset = entry.getVerdef()->getAux()->vda_name;
- } else {
- name_offset = entry.getVernaux()->vna_name;
- }
-
- // Set IsDefault
- if (entry.isVerdef()) {
- IsDefault = !(vs->vs_index & ELF::VERSYM_HIDDEN);
- } else {
- IsDefault = false;
- }
-
- if (name_offset >= DynStrRegion.Size)
+ErrorOr<StringRef>
+ELFFile<ELFT>::getSectionName(const Elf_Shdr *Section) const {
+ uint32_t Offset = Section->sh_name;
+ if (Offset == 0)
+ return StringRef();
+ if (Offset >= DotShstrtab.size())
return object_error::parse_failed;
- return StringRef(getDynamicString(name_offset));
+ return StringRef(DotShstrtab.data() + Offset);
}
/// This function returns the hash value for a symbol in the .dynsym section
projects / oota-llvm.git / blobdiff