typedef typename std::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::forward_iterator_tag iterator_category;
- typedef value_type &reference;
- typedef value_type *pointer;
-
- /// \brief Default construct iterator.
- ELFEntityIterator() : EntitySize(0), Current(nullptr) {}
- 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+(difference_type n) {
- assert(Current && "Attempted to increment an invalid iterator!");
- Current += (n * EntitySize);
- return *this;
- }
-
- ELFEntityIterator &operator-(difference_type n) {
- assert(Current && "Attempted to subtract an invalid iterator!");
- Current -= (n * EntitySize);
- return *this;
- }
-
- ELFEntityIterator operator ++(int) {
- ELFEntityIterator Tmp = *this;
- ++*this;
- return Tmp;
- }
-
- 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 Elf_Ehdr_Impl<ELFT> Elf_Ehdr;
typedef Elf_Shdr_Impl<ELFT> Elf_Shdr;
typedef Elf_Sym_Impl<ELFT> Elf_Sym;
typedef iterator_range<const Elf_Sym *> Elf_Sym_Range;
+ 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;
StringRef Buf;
- const uint8_t *base() const {
- return reinterpret_cast<const uint8_t *>(Buf.data());
- }
-
const Elf_Ehdr *Header;
const Elf_Shdr *SectionHeaderTable = nullptr;
StringRef DotShstrtab; // Section header string table.
StringRef DotStrtab; // Symbol header string table.
const Elf_Shdr *dot_symtab_sec = nullptr; // Symbol table section.
const Elf_Shdr *DotDynSymSec = nullptr; // Dynamic symbol table section.
- const Elf_Hash *HashTable = nullptr;
const Elf_Shdr *SymbolTableSectionHeaderIndex = nullptr;
DenseMap<const Elf_Sym *, ELF::Elf64_Word> ExtendedSymbolTable;
const Elf_Shdr *dot_gnu_version_r_sec = nullptr; // .gnu.version_r
const Elf_Shdr *dot_gnu_version_d_sec = nullptr; // .gnu.version_d
- /// \brief Represents a region described by entries in the .dynamic table.
- struct DynRegionInfo {
- DynRegionInfo() : Addr(nullptr), 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 DynStrRegion;
- DynRegionInfo DynRelaRegion;
-
- // SONAME entry in dynamic string table
- StringRef DTSoname;
-
// 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> {
void LoadVersionNeeds(const Elf_Shdr *ec) const;
void LoadVersionMap() const;
- void scanDynamicTable();
-
public:
template<typename T>
const T *getEntry(uint32_t Section, uint32_t Entry) const;
const Elf_Shdr *getDotSymtabSec() const { return dot_symtab_sec; }
const Elf_Shdr *getDotDynSymSec() const { return DotDynSymSec; }
- const Elf_Hash *getHashTable() const { return HashTable; }
- StringRef getDynamicStringTable() const {
- return StringRef((const char *)DynStrRegion.Addr, DynStrRegion.Size);
- }
ErrorOr<StringRef> getStringTable(const Elf_Shdr *Section) const;
ErrorOr<StringRef> getStringTableForSymtab(const Elf_Shdr &Section) const;
- const char *getDynamicString(uintX_t Offset) const;
- ErrorOr<StringRef> getSymbolVersion(const Elf_Shdr *section,
- const Elf_Sym *Symb,
+ ErrorOr<StringRef> getSymbolVersion(StringRef StrTab, const Elf_Sym *Symb,
bool &IsDefault) const;
void VerifyStrTab(const Elf_Shdr *sh) const;
return make_range(section_begin(), section_end());
}
- const Elf_Sym *symbol_begin() const;
- const Elf_Sym *symbol_end() const;
- Elf_Sym_Range symbols() const {
- return make_range(symbol_begin(), symbol_end());
- }
-
- const Elf_Dyn *dynamic_table_begin() const;
- const Elf_Dyn *dynamic_table_end() const;
- Elf_Dyn_Range dynamic_table() const {
- return make_range(dynamic_table_begin(), dynamic_table_end());
- }
-
- const Elf_Sym *dynamic_symbol_begin() const {
- if (!DotDynSymSec)
+ const Elf_Sym *symbol_begin(const Elf_Shdr *Sec) const {
+ if (!Sec)
return nullptr;
- if (DotDynSymSec->sh_entsize != sizeof(Elf_Sym))
+ if (Sec->sh_entsize != sizeof(Elf_Sym))
report_fatal_error("Invalid symbol size");
- return reinterpret_cast<const Elf_Sym *>(base() + DotDynSymSec->sh_offset);
+ return reinterpret_cast<const Elf_Sym *>(base() + Sec->sh_offset);
}
-
- const Elf_Sym *dynamic_symbol_end() const {
- if (!DotDynSymSec)
+ const Elf_Sym *symbol_end(const Elf_Shdr *Sec) const {
+ if (!Sec)
return nullptr;
- return reinterpret_cast<const Elf_Sym *>(base() + DotDynSymSec->sh_offset +
- DotDynSymSec->sh_size);
+ 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 dynamic_symbols() const {
- return make_range(dynamic_symbol_begin(), dynamic_symbol_end());
+ Elf_Sym_Range symbols(const Elf_Shdr *Sec) const {
+ return make_range(symbol_begin(Sec), symbol_end(Sec));
}
- const Elf_Rela *dyn_rela_begin() const {
- if (DynRelaRegion.Size && DynRelaRegion.EntSize != sizeof(Elf_Rela))
- report_fatal_error("Invalid relocation entry size");
- return reinterpret_cast<const Elf_Rela *>(DynRelaRegion.Addr);
- }
+ const Elf_Sym *symbol_begin() const { return symbol_begin(dot_symtab_sec); }
+ const Elf_Sym *symbol_end() const { return symbol_end(dot_symtab_sec); }
+ Elf_Sym_Range symbols() const { return symbols(dot_symtab_sec); }
- const Elf_Rela *dyn_rela_end() const {
- uint64_t Size = DynRelaRegion.Size;
- if (Size % sizeof(Elf_Rela))
- report_fatal_error("Invalid relocation table size");
- return dyn_rela_begin() + Size / sizeof(Elf_Rela);
+ const Elf_Sym *dynamic_symbol_begin() const {
+ return symbol_begin(DotDynSymSec);
}
+ const Elf_Sym *dynamic_symbol_end() const { return symbol_end(DotDynSymSec); }
+ Elf_Sym_Range dynamic_symbols() const { return symbols(DotDynSymSec); }
typedef iterator_range<const Elf_Rela *> Elf_Rela_Range;
- Elf_Rela_Range dyn_relas() const {
- return make_range(dyn_rela_begin(), dyn_rela_end());
- }
-
const Elf_Rela *rela_begin(const Elf_Shdr *sec) const {
if (sec->sh_entsize != sizeof(Elf_Rela))
report_fatal_error("Invalid relocation entry size");
const Elf_Ehdr *getHeader() const { return Header; }
ErrorOr<const Elf_Shdr *> getSection(const Elf_Sym *symb) const;
ErrorOr<const Elf_Shdr *> getSection(uint32_t Index) const;
- const Elf_Sym *getSymbol(uint32_t index) const;
- ErrorOr<StringRef> getStaticSymbolName(const Elf_Sym *Symb) const;
- ErrorOr<StringRef> getDynamicSymbolName(const Elf_Sym *Symb) const;
- ErrorOr<StringRef> getSymbolName(const Elf_Sym *Symb, bool IsDynamic) const;
+ const Elf_Sym *getSymbol(const Elf_Shdr *Sec, uint32_t Index) const {
+ return &*(symbol_begin(Sec) + Index);
+ }
+ const Elf_Sym *getSymbol(uint32_t Index) const {
+ return getSymbol(dot_symtab_sec, Index);
+ }
ErrorOr<StringRef> getSectionName(const Elf_Shdr *Section) const;
ErrorOr<ArrayRef<uint8_t> > getSectionContents(const Elf_Shdr *Sec) const;
- StringRef getLoadName() const;
};
typedef ELFFile<ELFType<support::little, false>> ELF32LEFile;
return getSection(symb->st_shndx);
}
-template <class ELFT>
-const typename ELFFile<ELFT>::Elf_Sym *
-ELFFile<ELFT>::getSymbol(uint32_t Index) const {
- return &*(symbol_begin() + Index);
-}
-
template <class ELFT>
ErrorOr<ArrayRef<uint8_t> >
ELFFile<ELFT>::getSectionContents(const Elf_Shdr *Sec) const {
Header = reinterpret_cast<const Elf_Ehdr *>(base());
- if (Header->e_shoff == 0) {
- scanDynamicTable();
+ if (Header->e_shoff == 0)
return;
- }
const uint64_t SectionTableOffset = Header->e_shoff;
for (const Elf_Shdr &Sec : sections()) {
switch (Sec.sh_type) {
- case ELF::SHT_HASH:
- if (HashTable) {
- EC = object_error::parse_failed;
- return;
- }
- HashTable = reinterpret_cast<const Elf_Hash *>(base() + Sec.sh_offset);
- break;
case ELF::SHT_SYMTAB_SHNDX:
if (SymbolTableSectionHeaderIndex) {
// More than one .symtab_shndx!
}
// Get string table sections.
- ErrorOr<const Elf_Shdr *> StrTabSecOrErr = getSection(getStringTableIndex());
- if ((EC = StrTabSecOrErr.getError()))
- return;
+ uintX_t StringTableIndex = getStringTableIndex();
+ if (StringTableIndex) {
+ ErrorOr<const Elf_Shdr *> StrTabSecOrErr =
+ getSection(getStringTableIndex());
+ if ((EC = StrTabSecOrErr.getError()))
+ return;
- ErrorOr<StringRef> SymtabOrErr = getStringTable(*StrTabSecOrErr);
- if ((EC = SymtabOrErr.getError()))
- return;
- DotShstrtab = *SymtabOrErr;
+ ErrorOr<StringRef> SymtabOrErr = getStringTable(*StrTabSecOrErr);
+ if ((EC = SymtabOrErr.getError()))
+ return;
+ DotShstrtab = *SymtabOrErr;
+ }
// Build symbol name side-mapping if there is one.
if (SymbolTableSectionHeaderIndex) {
}
}
- scanDynamicTable();
-
EC = std::error_code();
}
return VAddr < Phdr->p_vaddr;
}
-template <class ELFT> void ELFFile<ELFT>::scanDynamicTable() {
- SmallVector<const Elf_Phdr *, 4> LoadSegments;
- for (const Elf_Phdr &Phdr : program_headers()) {
- if (Phdr.p_type == ELF::PT_DYNAMIC) {
- DynamicRegion.Addr = base() + Phdr.p_offset;
- DynamicRegion.Size = Phdr.p_filesz;
- continue;
- }
- if (Phdr.p_type != ELF::PT_LOAD || Phdr.p_filesz == 0)
- continue;
- LoadSegments.push_back(&Phdr);
- }
-
- auto toMappedAddr = [&](uint64_t VAddr) -> const uint8_t * {
- const Elf_Phdr **I = std::upper_bound(
- LoadSegments.begin(), LoadSegments.end(), VAddr, compareAddr<ELFT>);
- if (I == LoadSegments.begin())
- report_fatal_error("Virtual address is not in any segment");
- --I;
- const Elf_Phdr &Phdr = **I;
- uint64_t Delta = VAddr - Phdr.p_vaddr;
- if (Delta >= Phdr.p_filesz)
- report_fatal_error("Virtual address is not in any segment");
- return this->base() + Phdr.p_offset + Delta;
- };
-
- uint64_t SONameOffset = 0;
- for (const Elf_Dyn &Dyn : dynamic_table()) {
- switch (Dyn.d_tag) {
- case ELF::DT_HASH:
- if (HashTable)
- continue;
- HashTable =
- reinterpret_cast<const Elf_Hash *>(toMappedAddr(Dyn.getPtr()));
- break;
- case ELF::DT_STRTAB:
- if (!DynStrRegion.Addr)
- DynStrRegion.Addr = toMappedAddr(Dyn.getPtr());
- break;
- case ELF::DT_STRSZ:
- if (!DynStrRegion.Size)
- DynStrRegion.Size = Dyn.getVal();
- break;
- case ELF::DT_RELA:
- if (!DynRelaRegion.Addr)
- DynRelaRegion.Addr = toMappedAddr(Dyn.getPtr());
- break;
- case ELF::DT_RELASZ:
- DynRelaRegion.Size = Dyn.getVal();
- break;
- case ELF::DT_RELAENT:
- DynRelaRegion.EntSize = Dyn.getVal();
- break;
- case ELF::DT_SONAME:
- SONameOffset = Dyn.getVal();
- break;
- }
- }
- if (SONameOffset)
- DTSoname = getDynamicString(SONameOffset);
-}
-
template <class ELFT>
const typename ELFFile<ELFT>::Elf_Shdr *ELFFile<ELFT>::section_begin() const {
if (Header->e_shentsize != sizeof(Elf_Shdr))
return section_begin() + getNumSections();
}
-template <class ELFT>
-const typename ELFFile<ELFT>::Elf_Sym *ELFFile<ELFT>::symbol_begin() const {
- if (!dot_symtab_sec)
- return nullptr;
- if (dot_symtab_sec->sh_entsize != sizeof(Elf_Sym))
- report_fatal_error("Invalid symbol size");
- return reinterpret_cast<const Elf_Sym *>(base() + dot_symtab_sec->sh_offset);
-}
-
-template <class ELFT>
-const typename ELFFile<ELFT>::Elf_Sym *ELFFile<ELFT>::symbol_end() const {
- if (!dot_symtab_sec)
- return nullptr;
- return reinterpret_cast<const Elf_Sym *>(base() + dot_symtab_sec->sh_offset +
- dot_symtab_sec->sh_size);
-}
-
-template <class ELFT>
-const typename ELFFile<ELFT>::Elf_Dyn *
-ELFFile<ELFT>::dynamic_table_begin() const {
- return reinterpret_cast<const Elf_Dyn *>(DynamicRegion.Addr);
-}
-
-template <class ELFT>
-const typename ELFFile<ELFT>::Elf_Dyn *
-ELFFile<ELFT>::dynamic_table_end() const {
- uint64_t Size = DynamicRegion.Size;
- if (Size % sizeof(Elf_Dyn))
- report_fatal_error("Invalid dynamic table size");
-
- return dynamic_table_begin() + Size / sizeof(Elf_Dyn);
-}
-
-template <class ELFT>
-StringRef ELFFile<ELFT>::getLoadName() const {
- return DTSoname;
-}
-
template <class ELFT>
template <typename T>
const T *ELFFile<ELFT>::getEntry(uint32_t Section, uint32_t Entry) const {
return getStringTable(*SectionOrErr);
}
-template <class ELFT>
-const char *ELFFile<ELFT>::getDynamicString(uintX_t Offset) const {
- if (Offset >= DynStrRegion.Size)
- return nullptr;
- return (const char *)DynStrRegion.Addr + Offset;
-}
-
-template <class ELFT>
-ErrorOr<StringRef>
-ELFFile<ELFT>::getStaticSymbolName(const Elf_Sym *Symb) const {
- return Symb->getName(DotStrtab);
-}
-
-template <class ELFT>
-ErrorOr<StringRef>
-ELFFile<ELFT>::getDynamicSymbolName(const Elf_Sym *Symb) const {
- return StringRef(getDynamicString(Symb->st_name));
-}
-
-template <class ELFT>
-ErrorOr<StringRef> ELFFile<ELFT>::getSymbolName(const Elf_Sym *Symb,
- bool IsDynamic) const {
- if (IsDynamic)
- return getDynamicSymbolName(Symb);
- return getStaticSymbolName(Symb);
-}
-
template <class ELFT>
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(DotShstrtab.data() + Offset);
}
template <class ELFT>
-ErrorOr<StringRef> ELFFile<ELFT>::getSymbolVersion(const Elf_Shdr *section,
+ErrorOr<StringRef> ELFFile<ELFT>::getSymbolVersion(StringRef StrTab,
const Elf_Sym *symb,
bool &IsDefault) const {
- StringRef StrTab;
- if (section) {
- ErrorOr<StringRef> StrTabOrErr = getStringTable(section);
- if (std::error_code EC = StrTabOrErr.getError())
- return EC;
- StrTab = *StrTabOrErr;
- }
- // Handle non-dynamic symbols.
- if (section != DotDynSymSec && section != nullptr) {
- // 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 = symb->getName(StrTab);
- 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) {
// No version table.
IsDefault = false;
}
- if (name_offset >= DynStrRegion.Size)
+ if (name_offset >= StrTab.size())
return object_error::parse_failed;
- return StringRef(getDynamicString(name_offset));
+ return StringRef(StrTab.data() + name_offset);
}
/// This function returns the hash value for a symbol in the .dynsym section
projects / oota-llvm.git / blobdiff