forked from OSchip/llvm-project
Revert r317046, "Object: Move some code from ELF.h into ELF.cpp."
This change resulted in a measured 1.5-2% perf regression linking chrome. llvm-svn: 317371
This commit is contained in:
Peter Collingbourne
parent
f52496e1e0
commit
c2935db629
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@ -204,6 +204,46 @@ getExtendedSymbolTableIndex(const typename ELFT::Sym *Sym,
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return ShndxTable[Index];
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}
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template <class ELFT>
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Expected<uint32_t>
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ELFFile<ELFT>::getSectionIndex(const Elf_Sym *Sym, Elf_Sym_Range Syms,
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ArrayRef<Elf_Word> ShndxTable) const {
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uint32_t Index = Sym->st_shndx;
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if (Index == ELF::SHN_XINDEX) {
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auto ErrorOrIndex = getExtendedSymbolTableIndex<ELFT>(
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Sym, Syms.begin(), ShndxTable);
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if (!ErrorOrIndex)
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return ErrorOrIndex.takeError();
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return *ErrorOrIndex;
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}
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if (Index == ELF::SHN_UNDEF || Index >= ELF::SHN_LORESERVE)
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return 0;
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return Index;
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}
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template <class ELFT>
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Expected<const typename ELFT::Shdr *>
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ELFFile<ELFT>::getSection(const Elf_Sym *Sym, const Elf_Shdr *SymTab,
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ArrayRef<Elf_Word> ShndxTable) const {
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auto SymsOrErr = symbols(SymTab);
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if (!SymsOrErr)
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return SymsOrErr.takeError();
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return getSection(Sym, *SymsOrErr, ShndxTable);
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}
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template <class ELFT>
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Expected<const typename ELFT::Shdr *>
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ELFFile<ELFT>::getSection(const Elf_Sym *Sym, Elf_Sym_Range Symbols,
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ArrayRef<Elf_Word> ShndxTable) const {
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auto IndexOrErr = getSectionIndex(Sym, Symbols, ShndxTable);
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if (!IndexOrErr)
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return IndexOrErr.takeError();
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uint32_t Index = *IndexOrErr;
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if (Index == 0)
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return nullptr;
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return getSection(Index);
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}
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template <class ELFT>
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inline Expected<const typename ELFT::Sym *>
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getSymbol(typename ELFT::SymRange Symbols, uint32_t Index) {
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@ -212,6 +252,15 @@ getSymbol(typename ELFT::SymRange Symbols, uint32_t Index) {
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return &Symbols[Index];
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}
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template <class ELFT>
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Expected<const typename ELFT::Sym *>
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ELFFile<ELFT>::getSymbol(const Elf_Shdr *Sec, uint32_t Index) const {
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auto SymtabOrErr = symbols(Sec);
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if (!SymtabOrErr)
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return SymtabOrErr.takeError();
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return object::getSymbol<ELFT>(*SymtabOrErr, Index);
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}
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template <class ELFT>
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template <typename T>
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Expected<ArrayRef<T>>
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@ -232,6 +281,119 @@ ELFFile<ELFT>::getSectionContentsAsArray(const Elf_Shdr *Sec) const {
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return makeArrayRef(Start, Size / sizeof(T));
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}
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template <class ELFT>
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Expected<ArrayRef<uint8_t>>
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ELFFile<ELFT>::getSectionContents(const Elf_Shdr *Sec) const {
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return getSectionContentsAsArray<uint8_t>(Sec);
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}
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template <class ELFT>
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StringRef ELFFile<ELFT>::getRelocationTypeName(uint32_t Type) const {
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return getELFRelocationTypeName(getHeader()->e_machine, Type);
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}
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template <class ELFT>
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void ELFFile<ELFT>::getRelocationTypeName(uint32_t Type,
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SmallVectorImpl<char> &Result) const {
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if (!isMipsELF64()) {
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StringRef Name = getRelocationTypeName(Type);
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Result.append(Name.begin(), Name.end());
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} else {
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// The Mips N64 ABI allows up to three operations to be specified per
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// relocation record. Unfortunately there's no easy way to test for the
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// presence of N64 ELFs as they have no special flag that identifies them
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// as being N64. We can safely assume at the moment that all Mips
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// ELFCLASS64 ELFs are N64. New Mips64 ABIs should provide enough
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// information to disambiguate between old vs new ABIs.
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uint8_t Type1 = (Type >> 0) & 0xFF;
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uint8_t Type2 = (Type >> 8) & 0xFF;
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uint8_t Type3 = (Type >> 16) & 0xFF;
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// Concat all three relocation type names.
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StringRef Name = getRelocationTypeName(Type1);
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Result.append(Name.begin(), Name.end());
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Name = getRelocationTypeName(Type2);
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Result.append(1, '/');
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Result.append(Name.begin(), Name.end());
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Name = getRelocationTypeName(Type3);
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Result.append(1, '/');
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Result.append(Name.begin(), Name.end());
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}
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}
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template <class ELFT>
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Expected<const typename ELFT::Sym *>
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ELFFile<ELFT>::getRelocationSymbol(const Elf_Rel *Rel,
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const Elf_Shdr *SymTab) const {
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uint32_t Index = Rel->getSymbol(isMips64EL());
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if (Index == 0)
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return nullptr;
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return getEntry<Elf_Sym>(SymTab, Index);
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}
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template <class ELFT>
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Expected<StringRef>
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ELFFile<ELFT>::getSectionStringTable(Elf_Shdr_Range Sections) const {
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uint32_t Index = getHeader()->e_shstrndx;
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if (Index == ELF::SHN_XINDEX)
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Index = Sections[0].sh_link;
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if (!Index) // no section string table.
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return "";
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if (Index >= Sections.size())
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return createError("invalid section index");
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return getStringTable(&Sections[Index]);
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}
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template <class ELFT> ELFFile<ELFT>::ELFFile(StringRef Object) : Buf(Object) {}
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template <class ELFT>
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Expected<ELFFile<ELFT>> ELFFile<ELFT>::create(StringRef Object) {
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if (sizeof(Elf_Ehdr) > Object.size())
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return createError("Invalid buffer");
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return ELFFile(Object);
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}
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template <class ELFT>
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Expected<typename ELFT::ShdrRange> ELFFile<ELFT>::sections() const {
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const uintX_t SectionTableOffset = getHeader()->e_shoff;
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if (SectionTableOffset == 0)
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return ArrayRef<Elf_Shdr>();
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if (getHeader()->e_shentsize != sizeof(Elf_Shdr))
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return createError(
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"invalid section header entry size (e_shentsize) in ELF header");
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const uint64_t FileSize = Buf.size();
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if (SectionTableOffset + sizeof(Elf_Shdr) > FileSize)
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return createError("section header table goes past the end of the file");
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// Invalid address alignment of section headers
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if (SectionTableOffset & (alignof(Elf_Shdr) - 1))
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return createError("invalid alignment of section headers");
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const Elf_Shdr *First =
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reinterpret_cast<const Elf_Shdr *>(base() + SectionTableOffset);
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uintX_t NumSections = getHeader()->e_shnum;
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if (NumSections == 0)
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NumSections = First->sh_size;
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if (NumSections > UINT64_MAX / sizeof(Elf_Shdr))
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return createError("section table goes past the end of file");
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const uint64_t SectionTableSize = NumSections * sizeof(Elf_Shdr);
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// Section table goes past end of file!
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if (SectionTableOffset + SectionTableSize > FileSize)
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return createError("section table goes past the end of file");
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return makeArrayRef(First, NumSections);
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}
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template <class ELFT>
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template <typename T>
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Expected<const T *> ELFFile<ELFT>::getEntry(uint32_t Section,
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@ -254,6 +416,107 @@ Expected<const T *> ELFFile<ELFT>::getEntry(const Elf_Shdr *Section,
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return reinterpret_cast<const T *>(base() + Pos);
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}
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template <class ELFT>
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Expected<const typename ELFT::Shdr *>
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ELFFile<ELFT>::getSection(uint32_t Index) const {
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auto TableOrErr = sections();
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if (!TableOrErr)
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return TableOrErr.takeError();
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return object::getSection<ELFT>(*TableOrErr, Index);
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}
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template <class ELFT>
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Expected<StringRef>
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ELFFile<ELFT>::getStringTable(const Elf_Shdr *Section) const {
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if (Section->sh_type != ELF::SHT_STRTAB)
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return createError("invalid sh_type for string table, expected SHT_STRTAB");
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auto V = getSectionContentsAsArray<char>(Section);
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if (!V)
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return V.takeError();
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ArrayRef<char> Data = *V;
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if (Data.empty())
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return createError("empty string table");
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if (Data.back() != '\0')
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return createError("string table non-null terminated");
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return StringRef(Data.begin(), Data.size());
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}
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template <class ELFT>
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Expected<ArrayRef<typename ELFT::Word>>
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ELFFile<ELFT>::getSHNDXTable(const Elf_Shdr &Section) const {
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auto SectionsOrErr = sections();
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if (!SectionsOrErr)
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return SectionsOrErr.takeError();
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return getSHNDXTable(Section, *SectionsOrErr);
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}
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template <class ELFT>
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Expected<ArrayRef<typename ELFT::Word>>
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ELFFile<ELFT>::getSHNDXTable(const Elf_Shdr &Section,
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Elf_Shdr_Range Sections) const {
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assert(Section.sh_type == ELF::SHT_SYMTAB_SHNDX);
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auto VOrErr = getSectionContentsAsArray<Elf_Word>(&Section);
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if (!VOrErr)
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return VOrErr.takeError();
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ArrayRef<Elf_Word> V = *VOrErr;
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auto SymTableOrErr = object::getSection<ELFT>(Sections, Section.sh_link);
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if (!SymTableOrErr)
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return SymTableOrErr.takeError();
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const Elf_Shdr &SymTable = **SymTableOrErr;
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if (SymTable.sh_type != ELF::SHT_SYMTAB &&
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SymTable.sh_type != ELF::SHT_DYNSYM)
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return createError("invalid sh_type");
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if (V.size() != (SymTable.sh_size / sizeof(Elf_Sym)))
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return createError("invalid section contents size");
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return V;
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}
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template <class ELFT>
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Expected<StringRef>
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ELFFile<ELFT>::getStringTableForSymtab(const Elf_Shdr &Sec) const {
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auto SectionsOrErr = sections();
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if (!SectionsOrErr)
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return SectionsOrErr.takeError();
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return getStringTableForSymtab(Sec, *SectionsOrErr);
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}
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template <class ELFT>
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Expected<StringRef>
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ELFFile<ELFT>::getStringTableForSymtab(const Elf_Shdr &Sec,
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Elf_Shdr_Range Sections) const {
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if (Sec.sh_type != ELF::SHT_SYMTAB && Sec.sh_type != ELF::SHT_DYNSYM)
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return createError(
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"invalid sh_type for symbol table, expected SHT_SYMTAB or SHT_DYNSYM");
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auto SectionOrErr = object::getSection<ELFT>(Sections, Sec.sh_link);
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if (!SectionOrErr)
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return SectionOrErr.takeError();
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return getStringTable(*SectionOrErr);
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}
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template <class ELFT>
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Expected<StringRef>
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ELFFile<ELFT>::getSectionName(const Elf_Shdr *Section) const {
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auto SectionsOrErr = sections();
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if (!SectionsOrErr)
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return SectionsOrErr.takeError();
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auto Table = getSectionStringTable(*SectionsOrErr);
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if (!Table)
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return Table.takeError();
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return getSectionName(Section, *Table);
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}
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template <class ELFT>
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Expected<StringRef> ELFFile<ELFT>::getSectionName(const Elf_Shdr *Section,
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StringRef DotShstrtab) const {
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uint32_t Offset = Section->sh_name;
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if (Offset == 0)
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return StringRef();
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if (Offset >= DotShstrtab.size())
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return createError("invalid string offset");
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return StringRef(DotShstrtab.data() + Offset);
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}
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/// This function returns the hash value for a symbol in the .dynsym section
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/// Name of the API remains consistent as specified in the libelf
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/// REF : http://www.sco.com/developers/gabi/latest/ch5.dynamic.html#hash
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@ -214,269 +214,6 @@ StringRef llvm::object::getELFSectionTypeName(uint32_t Machine, unsigned Type) {
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}
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}
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template <class ELFT>
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Expected<uint32_t>
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ELFFile<ELFT>::getSectionIndex(const Elf_Sym *Sym, Elf_Sym_Range Syms,
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ArrayRef<Elf_Word> ShndxTable) const {
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uint32_t Index = Sym->st_shndx;
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if (Index == ELF::SHN_XINDEX) {
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auto ErrorOrIndex = getExtendedSymbolTableIndex<ELFT>(
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Sym, Syms.begin(), ShndxTable);
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if (!ErrorOrIndex)
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return ErrorOrIndex.takeError();
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return *ErrorOrIndex;
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}
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if (Index == ELF::SHN_UNDEF || Index >= ELF::SHN_LORESERVE)
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return 0;
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return Index;
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}
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template <class ELFT>
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Expected<const typename ELFT::Shdr *>
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ELFFile<ELFT>::getSection(const Elf_Sym *Sym, const Elf_Shdr *SymTab,
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ArrayRef<Elf_Word> ShndxTable) const {
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auto SymsOrErr = symbols(SymTab);
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if (!SymsOrErr)
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return SymsOrErr.takeError();
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return getSection(Sym, *SymsOrErr, ShndxTable);
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}
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template <class ELFT>
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Expected<const typename ELFT::Shdr *>
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ELFFile<ELFT>::getSection(const Elf_Sym *Sym, Elf_Sym_Range Symbols,
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ArrayRef<Elf_Word> ShndxTable) const {
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auto IndexOrErr = getSectionIndex(Sym, Symbols, ShndxTable);
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if (!IndexOrErr)
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return IndexOrErr.takeError();
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uint32_t Index = *IndexOrErr;
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if (Index == 0)
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return nullptr;
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return getSection(Index);
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}
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template <class ELFT>
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Expected<const typename ELFT::Sym *>
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ELFFile<ELFT>::getSymbol(const Elf_Shdr *Sec, uint32_t Index) const {
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auto SymtabOrErr = symbols(Sec);
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if (!SymtabOrErr)
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return SymtabOrErr.takeError();
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return object::getSymbol<ELFT>(*SymtabOrErr, Index);
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}
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template <class ELFT>
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Expected<ArrayRef<uint8_t>>
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ELFFile<ELFT>::getSectionContents(const Elf_Shdr *Sec) const {
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return getSectionContentsAsArray<uint8_t>(Sec);
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}
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template <class ELFT>
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StringRef ELFFile<ELFT>::getRelocationTypeName(uint32_t Type) const {
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return getELFRelocationTypeName(getHeader()->e_machine, Type);
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}
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template <class ELFT>
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void ELFFile<ELFT>::getRelocationTypeName(uint32_t Type,
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SmallVectorImpl<char> &Result) const {
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if (!isMipsELF64()) {
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StringRef Name = getRelocationTypeName(Type);
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Result.append(Name.begin(), Name.end());
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} else {
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// The Mips N64 ABI allows up to three operations to be specified per
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// relocation record. Unfortunately there's no easy way to test for the
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// presence of N64 ELFs as they have no special flag that identifies them
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// as being N64. We can safely assume at the moment that all Mips
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// ELFCLASS64 ELFs are N64. New Mips64 ABIs should provide enough
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// information to disambiguate between old vs new ABIs.
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uint8_t Type1 = (Type >> 0) & 0xFF;
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uint8_t Type2 = (Type >> 8) & 0xFF;
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uint8_t Type3 = (Type >> 16) & 0xFF;
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// Concat all three relocation type names.
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StringRef Name = getRelocationTypeName(Type1);
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Result.append(Name.begin(), Name.end());
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Name = getRelocationTypeName(Type2);
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Result.append(1, '/');
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Result.append(Name.begin(), Name.end());
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Name = getRelocationTypeName(Type3);
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Result.append(1, '/');
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Result.append(Name.begin(), Name.end());
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}
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}
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template <class ELFT>
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Expected<const typename ELFT::Sym *>
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ELFFile<ELFT>::getRelocationSymbol(const Elf_Rel *Rel,
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const Elf_Shdr *SymTab) const {
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uint32_t Index = Rel->getSymbol(isMips64EL());
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if (Index == 0)
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return nullptr;
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return getEntry<Elf_Sym>(SymTab, Index);
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}
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template <class ELFT>
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Expected<StringRef>
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ELFFile<ELFT>::getSectionStringTable(Elf_Shdr_Range Sections) const {
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uint32_t Index = getHeader()->e_shstrndx;
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if (Index == ELF::SHN_XINDEX)
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Index = Sections[0].sh_link;
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if (!Index) // no section string table.
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return "";
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if (Index >= Sections.size())
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return createError("invalid section index");
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return getStringTable(&Sections[Index]);
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}
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template <class ELFT> ELFFile<ELFT>::ELFFile(StringRef Object) : Buf(Object) {}
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template <class ELFT>
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Expected<ELFFile<ELFT>> ELFFile<ELFT>::create(StringRef Object) {
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if (sizeof(Elf_Ehdr) > Object.size())
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return createError("Invalid buffer");
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return ELFFile(Object);
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}
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template <class ELFT>
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Expected<typename ELFT::ShdrRange> ELFFile<ELFT>::sections() const {
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const uintX_t SectionTableOffset = getHeader()->e_shoff;
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if (SectionTableOffset == 0)
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return ArrayRef<Elf_Shdr>();
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if (getHeader()->e_shentsize != sizeof(Elf_Shdr))
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return createError(
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"invalid section header entry size (e_shentsize) in ELF header");
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const uint64_t FileSize = Buf.size();
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if (SectionTableOffset + sizeof(Elf_Shdr) > FileSize)
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return createError("section header table goes past the end of the file");
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// Invalid address alignment of section headers
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if (SectionTableOffset & (alignof(Elf_Shdr) - 1))
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return createError("invalid alignment of section headers");
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|
||||
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>
|
||||
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);
|
||||
}
|
||||
|
||||
template <class ELFT>
|
||||
Expected<std::vector<typename ELFT::Rela>>
|
||||
ELFFile<ELFT>::android_relas(const Elf_Shdr *Sec) const {
|
||||
|
|
|
|||
Loading…
Reference in New Issue