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llvm-readobj: Use hash tables to print dynamic symbols.
-symbols prints both .symtab and .dynsym symbols for GNU style in ELF. -dyn-symbols prints symbols looking up through hash tables. This helps validate hash tables. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@287786 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hemant Kulkarni
parent
33d568124e
commit
fe8bde7e92
@ -4,6 +4,8 @@ RUN: llvm-readobj -symbols %p/Inputs/relocs.obj.elf-x86_64 --elf-output-style=GN
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RUN: | FileCheck %s -check-prefix ELF64
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RUN: llvm-readobj -symbols %p/Inputs/gnuhash.so.elf-x86_64 --elf-output-style=GNU \
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RUN: | FileCheck %s -check-prefix DYN
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RUN: llvm-readobj -dyn-symbols %p/Inputs/dynamic-table-exe.x86 --elf-output-style=GNU \
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RUN: | FileCheck %s -check-prefix HASH
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ELF32: Symbol table '.symtab' contains 5 entries:
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ELF32-NEXT: Num: Value Size Type Bind Vis Ndx Name
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@ -44,3 +46,29 @@ DYN-NEXT: 8: 0000000000200268 0 NOTYPE GLOBAL DEFAULT 5 __bss_start
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DYN-NEXT: 9: 00000000000001b8 0 NOTYPE GLOBAL DEFAULT 4 foo
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DYN-NEXT: 10: 0000000000200268 0 NOTYPE GLOBAL DEFAULT 5 _edata
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DYN-NEXT: 11: 0000000000200268 0 NOTYPE GLOBAL DEFAULT 5 _end
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HASH: Symbol table of .hash for image:
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HASH-NEXT: Num Buc: Value Size Type Bind Vis Ndx Name
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HASH-NEXT: 9 0: 00000000 0 FUNC GLOBAL DEFAULT UND __gxx_personality_v0@CXXABI_1.3
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HASH-NEXT: 13 0: 00001b64 0 NOTYPE GLOBAL DEFAULT ABS _edata@
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HASH-NEXT: 7 0: 00000000 0 FUNC GLOBAL DEFAULT UND _ZNSt14basic_ifstreamIcSt11char_traitsIcEEC1EPKcSt13_Ios_Openmode@GLIBCXX_3.4
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HASH-NEXT: 2 0: 00000000 0 NOTYPE WEAK DEFAULT UND _Jv_RegisterClasses@
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HASH-NEXT: 1 0: 00000000 0 NOTYPE WEAK DEFAULT UND __gmon_start__@
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HASH-NEXT: 16 1: 00000850 81 FUNC GLOBAL DEFAULT 14 main@
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HASH-NEXT: 10 1: 00000000 0 FUNC GLOBAL DEFAULT UND _Unwind_Resume@GCC_3.0
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HASH-NEXT: 8 1: 00000000 0 FUNC GLOBAL DEFAULT UND puts@GLIBC_2.0
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HASH-NEXT: 12 1: 00001b68 0 NOTYPE GLOBAL DEFAULT ABS _end@
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HASH-NEXT: 6 1: 00000000 0 FUNC GLOBAL DEFAULT UND _ZNSt14basic_ifstreamIcSt11char_traitsIcEED1Ev@GLIBCXX_3.4
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HASH-NEXT: 5 1: 00000000 0 NOTYPE WEAK DEFAULT UND _ITM_registerTMCloneTable@
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HASH-NEXT: 4 1: 00000000 0 NOTYPE WEAK DEFAULT UND _ITM_deregisterTMCloneTable@
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HASH-NEXT: 3 1: 00000000 0 FUNC GLOBAL DEFAULT UND __libc_start_main@GLIBC_2.0
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HASH-NEXT: 11 2: 00000000 0 FUNC WEAK DEFAULT UND __cxa_finalize@GLIBC_2.1.3
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HASH-NEXT: 15 2: 00001b64 0 NOTYPE GLOBAL DEFAULT ABS __bss_start@
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HASH-NEXT: 14 2: 0000093c 4 OBJECT GLOBAL DEFAULT 16 _IO_stdin_used@
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HASH: Symbol table of .gnu.hash for image:
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HASH-NEXT: Num Buc: Value Size Type Bind Vis Ndx Name
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HASH-NEXT: 12 0: 00001b68 0 NOTYPE GLOBAL DEFAULT ABS _end@
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HASH-NEXT: 13 0: 00001b64 0 NOTYPE GLOBAL DEFAULT ABS _edata@
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HASH-NEXT: 14 1: 0000093c 4 OBJECT GLOBAL DEFAULT 16 _IO_stdin_used@
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HASH-NEXT: 15 1: 00001b64 0 NOTYPE GLOBAL DEFAULT ABS __bss_start@
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HASH-NEXT: 16 1: 00000850 81 FUNC GLOBAL DEFAULT 14 main@
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@ -328,6 +328,8 @@ private:
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OS.flush();
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return OS;
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}
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void printHashedSymbol(const ELFO *Obj, const Elf_Sym *FirstSym, uint32_t Sym,
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StringRef StrTable, uint32_t Bucket);
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void printRelocation(const ELFO *Obj, const Elf_Shdr *SymTab,
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const Elf_Rela &R, bool IsRela);
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void printSymbol(const ELFO *Obj, const Elf_Sym *Symbol, const Elf_Sym *First,
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@ -2812,15 +2814,120 @@ void GNUStyle<ELFT>::printSymbol(const ELFO *Obj, const Elf_Sym *Symbol,
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printField(Entry);
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OS << "\n";
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}
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template <class ELFT>
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void GNUStyle<ELFT>::printHashedSymbol(const ELFO *Obj, const Elf_Sym *FirstSym,
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uint32_t Sym, StringRef StrTable,
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uint32_t Bucket) {
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std::string Num, Buc, Name, Value, Size, Binding, Type, Visibility, Section;
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unsigned Width, Bias = 0;
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if (ELFT::Is64Bits) {
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Bias = 8;
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Width = 16;
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} else {
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Bias = 0;
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Width = 8;
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}
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Field Fields[9] = {0, 6, 11, 20 + Bias, 25 + Bias,
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34 + Bias, 41 + Bias, 49 + Bias, 53 + Bias};
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Num = to_string(format_decimal(Sym, 5));
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Buc = to_string(format_decimal(Bucket, 3)) + ":";
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const auto Symbol = FirstSym + Sym;
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Value = to_string(format_hex_no_prefix(Symbol->st_value, Width));
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Size = to_string(format_decimal(Symbol->st_size, 5));
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unsigned char SymbolType = Symbol->getType();
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if (Obj->getHeader()->e_machine == ELF::EM_AMDGPU &&
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SymbolType >= ELF::STT_LOOS && SymbolType < ELF::STT_HIOS)
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Type = printEnum(SymbolType, makeArrayRef(AMDGPUSymbolTypes));
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else
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Type = printEnum(SymbolType, makeArrayRef(ElfSymbolTypes));
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unsigned Vis = Symbol->getVisibility();
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Binding = printEnum(Symbol->getBinding(), makeArrayRef(ElfSymbolBindings));
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Visibility = printEnum(Vis, makeArrayRef(ElfSymbolVisibilities));
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Section = getSymbolSectionNdx(Obj, Symbol, FirstSym);
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Name = this->dumper()->getFullSymbolName(Symbol, StrTable, true);
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Fields[0].Str = Num;
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Fields[1].Str = Buc;
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Fields[2].Str = Value;
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Fields[3].Str = Size;
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Fields[4].Str = Type;
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Fields[5].Str = Binding;
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Fields[6].Str = Visibility;
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Fields[7].Str = Section;
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Fields[8].Str = Name;
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for (auto &Entry : Fields)
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printField(Entry);
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OS << "\n";
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}
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template <class ELFT> void GNUStyle<ELFT>::printSymbols(const ELFO *Obj) {
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if (opts::DynamicSymbols)
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return;
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this->dumper()->printSymbolsHelper(true);
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this->dumper()->printSymbolsHelper(false);
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}
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template <class ELFT>
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void GNUStyle<ELFT>::printDynamicSymbols(const ELFO *Obj) {
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this->dumper()->printSymbolsHelper(true);
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if (this->dumper()->getDynamicStringTable().size() == 0)
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return;
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auto StringTable = this->dumper()->getDynamicStringTable();
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auto DynSyms = this->dumper()->dynamic_symbols();
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auto GnuHash = this->dumper()->getGnuHashTable();
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auto SysVHash = this->dumper()->getHashTable();
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// If no hash or .gnu.hash found, try using symbol table
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if (GnuHash == nullptr && SysVHash == nullptr)
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this->dumper()->printSymbolsHelper(true);
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// Try printing .hash
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if (this->dumper()->getHashTable()) {
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OS << "\n Symbol table of .hash for image:\n";
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if (ELFT::Is64Bits)
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OS << " Num Buc: Value Size Type Bind Vis Ndx Name";
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else
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OS << " Num Buc: Value Size Type Bind Vis Ndx Name";
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OS << "\n";
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uint32_t NBuckets = SysVHash->nbucket;
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uint32_t NChains = SysVHash->nchain;
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auto Buckets = SysVHash->buckets();
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auto Chains = SysVHash->chains();
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for (uint32_t Buc = 0; Buc < NBuckets; Buc++) {
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if (Buckets[Buc] == ELF::STN_UNDEF)
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continue;
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for (uint32_t Ch = Buckets[Buc]; Ch < NChains; Ch = Chains[Ch]) {
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if (Ch == ELF::STN_UNDEF)
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break;
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printHashedSymbol(Obj, &DynSyms[0], Ch, StringTable, Buc);
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}
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}
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}
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// Try printing .gnu.hash
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if (GnuHash) {
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OS << "\n Symbol table of .gnu.hash for image:\n";
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if (ELFT::Is64Bits)
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OS << " Num Buc: Value Size Type Bind Vis Ndx Name";
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else
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OS << " Num Buc: Value Size Type Bind Vis Ndx Name";
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OS << "\n";
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uint32_t NBuckets = GnuHash->nbuckets;
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auto Buckets = GnuHash->buckets();
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for (uint32_t Buc = 0; Buc < NBuckets; Buc++) {
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if (Buckets[Buc] == ELF::STN_UNDEF)
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continue;
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uint32_t Index = Buckets[Buc];
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uint32_t GnuHashable = Index - GnuHash->symndx;
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// Print whole chain
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while (true) {
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printHashedSymbol(Obj, &DynSyms[0], Index++, StringTable, Buc);
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// Chain ends at symbol with stopper bit
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if ((GnuHash->values(DynSyms.size())[GnuHashable++] & 1) == 1)
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break;
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}
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}
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}
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}
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static inline std::string printPhdrFlags(unsigned Flag) {
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