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Support reading GNU symbol versions in ELFObjectFile
* Add enums and structures for GNU version information. * Implement extraction of that information on a per-symbol basis (ELFObjectFile::getSymbolVersion). * Implement a generic interface, GetELFSymbolVersion(), for getting the symbol version from the ObjectFile (hides the templating). * Have llvm-readobj print out the version, when available. * Add a test for the new feature: readobj-elf-versioning.test git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152436 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Meyer
parent
6f9489a86f
commit
2d70e263c2
@ -18,6 +18,7 @@
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#include "llvm/ADT/StringSwitch.h"
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#include "llvm/ADT/Triple.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/PointerIntPair.h"
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#include "llvm/Object/ObjectFile.h"
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#include "llvm/Support/Casting.h"
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#include "llvm/Support/ELF.h"
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@ -176,7 +177,72 @@ struct Elf_Sym_Impl : Elf_Sym_Base<target_endianness, is64Bits> {
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}
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};
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// Elf_Dyn: Entry in the dynamic table
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/// Elf_Versym: This is the structure of entries in the SHT_GNU_versym section
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/// (.gnu.version). This structure is identical for ELF32 and ELF64.
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template<support::endianness target_endianness, bool is64Bits>
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struct Elf_Versym_Impl {
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LLVM_ELF_IMPORT_TYPES(target_endianness, is64Bits)
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Elf_Half vs_index; // Version index with flags (e.g. VERSYM_HIDDEN)
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};
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template<support::endianness target_endianness, bool is64Bits>
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struct Elf_Verdaux_Impl;
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/// Elf_Verdef: This is the structure of entries in the SHT_GNU_verdef section
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/// (.gnu.version_d). This structure is identical for ELF32 and ELF64.
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template<support::endianness target_endianness, bool is64Bits>
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struct Elf_Verdef_Impl {
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LLVM_ELF_IMPORT_TYPES(target_endianness, is64Bits)
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typedef Elf_Verdaux_Impl<target_endianness, is64Bits> Elf_Verdaux;
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Elf_Half vd_version; // Version of this structure (e.g. VER_DEF_CURRENT)
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Elf_Half vd_flags; // Bitwise flags (VER_DEF_*)
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Elf_Half vd_ndx; // Version index, used in .gnu.version entries
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Elf_Half vd_cnt; // Number of Verdaux entries
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Elf_Word vd_hash; // Hash of name
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Elf_Word vd_aux; // Offset to the first Verdaux entry (in bytes)
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Elf_Word vd_next; // Offset to the next Verdef entry (in bytes)
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/// Get the first Verdaux entry for this Verdef.
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const Elf_Verdaux *getAux() const {
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return reinterpret_cast<const Elf_Verdaux*>((const char*)this + vd_aux);
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}
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};
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/// Elf_Verdaux: This is the structure of auxilary data in the SHT_GNU_verdef
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/// section (.gnu.version_d). This structure is identical for ELF32 and ELF64.
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template<support::endianness target_endianness, bool is64Bits>
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struct Elf_Verdaux_Impl {
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LLVM_ELF_IMPORT_TYPES(target_endianness, is64Bits)
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Elf_Word vda_name; // Version name (offset in string table)
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Elf_Word vda_next; // Offset to next Verdaux entry (in bytes)
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};
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/// Elf_Verneed: This is the structure of entries in the SHT_GNU_verneed
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/// section (.gnu.version_r). This structure is identical for ELF32 and ELF64.
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template<support::endianness target_endianness, bool is64Bits>
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struct Elf_Verneed_Impl {
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LLVM_ELF_IMPORT_TYPES(target_endianness, is64Bits)
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Elf_Half vn_version; // Version of this structure (e.g. VER_NEED_CURRENT)
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Elf_Half vn_cnt; // Number of associated Vernaux entries
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Elf_Word vn_file; // Library name (string table offset)
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Elf_Word vn_aux; // Offset to first Vernaux entry (in bytes)
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Elf_Word vn_next; // Offset to next Verneed entry (in bytes)
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};
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/// Elf_Vernaux: This is the structure of auxiliary data in SHT_GNU_verneed
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/// section (.gnu.version_r). This structure is identical for ELF32 and ELF64.
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template<support::endianness target_endianness, bool is64Bits>
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struct Elf_Vernaux_Impl {
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LLVM_ELF_IMPORT_TYPES(target_endianness, is64Bits)
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Elf_Word vna_hash; // Hash of dependency name
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Elf_Half vna_flags; // Bitwise Flags (VER_FLAG_*)
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Elf_Half vna_other; // Version index, used in .gnu.version entries
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Elf_Word vna_name; // Dependency name
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Elf_Word vna_next; // Offset to next Vernaux entry (in bytes)
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};
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/// Elf_Dyn_Base: This structure matches the form of entries in the dynamic
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/// table section (.dynamic) look like.
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template<support::endianness target_endianness, bool is64Bits>
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struct Elf_Dyn_Base;
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@ -200,6 +266,7 @@ struct Elf_Dyn_Base<target_endianness, true> {
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} d_un;
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};
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/// Elf_Dyn_Impl: This inherits from Elf_Dyn_Base, adding getters and setters.
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template<support::endianness target_endianness, bool is64Bits>
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struct Elf_Dyn_Impl : Elf_Dyn_Base<target_endianness, is64Bits> {
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using Elf_Dyn_Base<target_endianness, is64Bits>::d_tag;
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@ -323,6 +390,11 @@ class ELFObjectFile : public ObjectFile {
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typedef Elf_Dyn_Impl<target_endianness, is64Bits> Elf_Dyn;
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typedef Elf_Rel_Impl<target_endianness, is64Bits, false> Elf_Rel;
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typedef Elf_Rel_Impl<target_endianness, is64Bits, true> Elf_Rela;
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typedef Elf_Verdef_Impl<target_endianness, is64Bits> Elf_Verdef;
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typedef Elf_Verdaux_Impl<target_endianness, is64Bits> Elf_Verdaux;
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typedef Elf_Verneed_Impl<target_endianness, is64Bits> Elf_Verneed;
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typedef Elf_Vernaux_Impl<target_endianness, is64Bits> Elf_Vernaux;
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typedef Elf_Versym_Impl<target_endianness, is64Bits> Elf_Versym;
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typedef DynRefImpl<target_endianness, is64Bits> DynRef;
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typedef content_iterator<DynRef> dyn_iterator;
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@ -364,15 +436,48 @@ private:
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const Elf_Shdr *dot_shstrtab_sec; // Section header string table.
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const Elf_Shdr *dot_strtab_sec; // Symbol header string table.
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const Elf_Shdr *dot_dynstr_sec; // Dynamic symbol string table.
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// SymbolTableSections[0] always points to the dynamic string table section
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// header, or NULL if there is no dynamic string table.
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Sections_t SymbolTableSections;
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IndexMap_t SymbolTableSectionsIndexMap;
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DenseMap<const Elf_Sym*, ELF::Elf64_Word> ExtendedSymbolTable;
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const Elf_Shdr *dot_dynamic_sec; // .dynamic
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const Elf_Shdr *dot_dynamic_sec; // .dynamic
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const Elf_Shdr *dot_gnu_version_sec; // .gnu.version
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const Elf_Shdr *dot_gnu_version_r_sec; // .gnu.version_r
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const Elf_Shdr *dot_gnu_version_d_sec; // .gnu.version_d
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// Pointer to SONAME entry in dynamic string table
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// This is set the first time getLoadName is called.
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mutable const char *dt_soname;
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// Records for each version index the corresponding Verdef or Vernaux entry.
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// This is filled the first time LoadVersionMap() is called.
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class VersionMapEntry : public PointerIntPair<const void*, 1> {
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public:
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// If the integer is 0, this is an Elf_Verdef*.
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// If the integer is 1, this is an Elf_Vernaux*.
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VersionMapEntry() : PointerIntPair<const void*, 1>(NULL, 0) { }
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VersionMapEntry(const Elf_Verdef *verdef)
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: PointerIntPair<const void*, 1>(verdef, 0) { }
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VersionMapEntry(const Elf_Vernaux *vernaux)
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: PointerIntPair<const void*, 1>(vernaux, 1) { }
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bool isNull() const { return getPointer() == NULL; }
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bool isVerdef() const { return !isNull() && getInt() == 0; }
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bool isVernaux() const { return !isNull() && getInt() == 1; }
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const Elf_Verdef *getVerdef() const {
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return isVerdef() ? (const Elf_Verdef*)getPointer() : NULL;
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}
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const Elf_Vernaux *getVernaux() const {
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return isVernaux() ? (const Elf_Vernaux*)getPointer() : NULL;
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}
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};
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mutable SmallVector<VersionMapEntry, 16> VersionMap;
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void LoadVersionDefs(const Elf_Shdr *sec) const;
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void LoadVersionNeeds(const Elf_Shdr *ec) const;
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void LoadVersionMap() const;
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/// @brief Map sections to an array of relocation sections that reference
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/// them sorted by section index.
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RelocMap_t SectionRelocMap;
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@ -396,6 +501,10 @@ private:
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error_code getSymbolName(const Elf_Shdr *section,
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const Elf_Sym *Symb,
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StringRef &Res) const;
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error_code getSymbolVersion(const Elf_Shdr *section,
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const Elf_Sym *Symb,
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StringRef &Version,
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bool &IsDefault) const;
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void VerifyStrTab(const Elf_Shdr *sh) const;
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protected:
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@ -404,7 +513,8 @@ protected:
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public:
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const Elf_Dyn *getDyn(DataRefImpl DynData) const;
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error_code getSymbolVersion(SymbolRef Symb, StringRef &Version,
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bool &IsDefault) const;
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protected:
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virtual error_code getSymbolNext(DataRefImpl Symb, SymbolRef &Res) const;
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virtual error_code getSymbolName(DataRefImpl Symb, StringRef &Res) const;
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@ -473,6 +583,7 @@ public:
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virtual uint8_t getBytesInAddress() const;
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virtual StringRef getFileFormatName() const;
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virtual StringRef getObjectType() const { return "ELF"; }
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virtual unsigned getArch() const;
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virtual StringRef getLoadName() const;
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@ -490,6 +601,89 @@ public:
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static inline bool classof(const ELFObjectFile *v) { return true; }
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};
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// Iterate through the version definitions, and place each Elf_Verdef
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// in the VersionMap according to its index.
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template<support::endianness target_endianness, bool is64Bits>
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void ELFObjectFile<target_endianness, is64Bits>::
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LoadVersionDefs(const Elf_Shdr *sec) const {
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unsigned vd_size = sec->sh_size; // Size of section in bytes
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unsigned vd_count = sec->sh_info; // Number of Verdef entries
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const char *sec_start = (const char*)base() + sec->sh_offset;
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const char *sec_end = sec_start + vd_size;
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// The first Verdef entry is at the start of the section.
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const char *p = sec_start;
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for (unsigned i = 0; i < vd_count; i++) {
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if (p + sizeof(Elf_Verdef) > sec_end)
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report_fatal_error("Section ended unexpectedly while scanning "
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"version definitions.");
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const Elf_Verdef *vd = reinterpret_cast<const Elf_Verdef *>(p);
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if (vd->vd_version != ELF::VER_DEF_CURRENT)
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report_fatal_error("Unexpected verdef version");
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size_t index = vd->vd_ndx & ELF::VERSYM_VERSION;
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if (index >= VersionMap.size())
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VersionMap.resize(index+1);
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VersionMap[index] = VersionMapEntry(vd);
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p += vd->vd_next;
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}
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}
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// Iterate through the versions needed section, and place each Elf_Vernaux
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// in the VersionMap according to its index.
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template<support::endianness target_endianness, bool is64Bits>
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void ELFObjectFile<target_endianness, is64Bits>::
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LoadVersionNeeds(const Elf_Shdr *sec) const {
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unsigned vn_size = sec->sh_size; // Size of section in bytes
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unsigned vn_count = sec->sh_info; // Number of Verneed entries
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const char *sec_start = (const char*)base() + sec->sh_offset;
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const char *sec_end = sec_start + vn_size;
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// The first Verneed entry is at the start of the section.
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const char *p = sec_start;
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for (unsigned i = 0; i < vn_count; i++) {
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if (p + sizeof(Elf_Verneed) > sec_end)
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report_fatal_error("Section ended unexpectedly while scanning "
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"version needed records.");
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const Elf_Verneed *vn = reinterpret_cast<const Elf_Verneed *>(p);
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if (vn->vn_version != ELF::VER_NEED_CURRENT)
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report_fatal_error("Unexpected verneed version");
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// Iterate through the Vernaux entries
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const char *paux = p + vn->vn_aux;
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for (unsigned j = 0; j < vn->vn_cnt; j++) {
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if (paux + sizeof(Elf_Vernaux) > sec_end)
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report_fatal_error("Section ended unexpected while scanning auxiliary "
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"version needed records.");
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const Elf_Vernaux *vna = reinterpret_cast<const Elf_Vernaux *>(paux);
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size_t index = vna->vna_other & ELF::VERSYM_VERSION;
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if (index >= VersionMap.size())
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VersionMap.resize(index+1);
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VersionMap[index] = VersionMapEntry(vna);
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paux += vna->vna_next;
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}
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p += vn->vn_next;
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}
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}
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template<support::endianness target_endianness, bool is64Bits>
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void ELFObjectFile<target_endianness, is64Bits>::LoadVersionMap() const {
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// If there is no dynamic symtab or version table, there is nothing to do.
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if (SymbolTableSections[0] == NULL || dot_gnu_version_sec == NULL)
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return;
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// Has the VersionMap already been loaded?
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if (VersionMap.size() > 0)
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return;
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// The first two version indexes are reserved.
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// Index 0 is LOCAL, index 1 is GLOBAL.
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VersionMap.push_back(VersionMapEntry());
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VersionMap.push_back(VersionMapEntry());
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if (dot_gnu_version_d_sec)
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LoadVersionDefs(dot_gnu_version_d_sec);
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if (dot_gnu_version_r_sec)
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LoadVersionNeeds(dot_gnu_version_r_sec);
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}
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template<support::endianness target_endianness, bool is64Bits>
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void ELFObjectFile<target_endianness, is64Bits>
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::validateSymbol(DataRefImpl Symb) const {
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@ -546,6 +740,18 @@ error_code ELFObjectFile<target_endianness, is64Bits>
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return getSymbolName(SymbolTableSections[Symb.d.b], symb, Result);
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}
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template<support::endianness target_endianness, bool is64Bits>
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error_code ELFObjectFile<target_endianness, is64Bits>
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::getSymbolVersion(SymbolRef SymRef,
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StringRef &Version,
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bool &IsDefault) const {
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DataRefImpl Symb = SymRef.getRawDataRefImpl();
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validateSymbol(Symb);
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const Elf_Sym *symb = getSymbol(Symb);
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return getSymbolVersion(SymbolTableSections[Symb.d.b], symb,
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Version, IsDefault);
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}
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template<support::endianness target_endianness, bool is64Bits>
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ELF::Elf64_Word ELFObjectFile<target_endianness, is64Bits>
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::getSymbolTableIndex(const Elf_Sym *symb) const {
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@ -1266,7 +1472,11 @@ ELFObjectFile<target_endianness, is64Bits>::ELFObjectFile(MemoryBuffer *Object
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, dot_strtab_sec(0)
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, dot_dynstr_sec(0)
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, dot_dynamic_sec(0)
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, dt_soname(0) {
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, dot_gnu_version_sec(0)
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, dot_gnu_version_r_sec(0)
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, dot_gnu_version_d_sec(0)
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, dt_soname(0)
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{
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const uint64_t FileSize = Data->getBufferSize();
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@ -1302,31 +1512,60 @@ ELFObjectFile<target_endianness, is64Bits>::ELFObjectFile(MemoryBuffer *Object
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SymbolTableSections.push_back(NULL);
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for (uint64_t i = 0, e = getNumSections(); i != e; ++i) {
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if (sh->sh_type == ELF::SHT_SYMTAB_SHNDX) {
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switch (sh->sh_type) {
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case ELF::SHT_SYMTAB_SHNDX: {
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if (SymbolTableSectionHeaderIndex)
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// FIXME: Proper error handling.
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report_fatal_error("More than one .symtab_shndx!");
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SymbolTableSectionHeaderIndex = sh;
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break;
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}
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if (sh->sh_type == ELF::SHT_SYMTAB) {
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case ELF::SHT_SYMTAB: {
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SymbolTableSectionsIndexMap[i] = SymbolTableSections.size();
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SymbolTableSections.push_back(sh);
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break;
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}
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if (sh->sh_type == ELF::SHT_DYNSYM) {
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case ELF::SHT_DYNSYM: {
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if (SymbolTableSections[0] != NULL)
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// FIXME: Proper error handling.
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report_fatal_error("More than one .dynsym!");
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SymbolTableSectionsIndexMap[i] = 0;
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SymbolTableSections[0] = sh;
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break;
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}
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if (sh->sh_type == ELF::SHT_REL || sh->sh_type == ELF::SHT_RELA) {
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case ELF::SHT_REL:
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case ELF::SHT_RELA: {
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SectionRelocMap[getSection(sh->sh_info)].push_back(i);
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break;
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}
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if (sh->sh_type == ELF::SHT_DYNAMIC) {
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case ELF::SHT_DYNAMIC: {
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if (dot_dynamic_sec != NULL)
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// FIXME: Proper error handling.
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report_fatal_error("More than one .dynamic!");
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dot_dynamic_sec = sh;
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break;
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}
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case ELF::SHT_GNU_versym: {
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if (dot_gnu_version_sec != NULL)
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// FIXME: Proper error handling.
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report_fatal_error("More than one .gnu.version section!");
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dot_gnu_version_sec = sh;
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break;
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}
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case ELF::SHT_GNU_verdef: {
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if (dot_gnu_version_d_sec != NULL)
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// FIXME: Proper error handling.
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report_fatal_error("More than one .gnu.version_d section!");
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dot_gnu_version_d_sec = sh;
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break;
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}
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case ELF::SHT_GNU_verneed: {
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if (dot_gnu_version_r_sec != NULL)
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// FIXME: Proper error handling.
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report_fatal_error("More than one .gnu.version_r section!");
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dot_gnu_version_r_sec = sh;
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break;
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}
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}
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++sh;
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}
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@ -1775,6 +2014,89 @@ error_code ELFObjectFile<target_endianness, is64Bits>
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return object_error::success;
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}
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template<support::endianness target_endianness, bool is64Bits>
|
||||
error_code ELFObjectFile<target_endianness, is64Bits>
|
||||
::getSymbolVersion(const Elf_Shdr *section,
|
||||
const Elf_Sym *symb,
|
||||
StringRef &Version,
|
||||
bool &IsDefault) const {
|
||||
// Handle non-dynamic symbols.
|
||||
if (section != SymbolTableSections[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.
|
||||
StringRef Name;
|
||||
error_code ec = getSymbolName(section, symb, Name);
|
||||
if (ec != object_error::success)
|
||||
return ec;
|
||||
size_t atpos = Name.find('@');
|
||||
if (atpos == StringRef::npos) {
|
||||
Version = "";
|
||||
IsDefault = false;
|
||||
return object_error::success;
|
||||
}
|
||||
++atpos;
|
||||
if (atpos < Name.size() && Name[atpos] == '@') {
|
||||
IsDefault = true;
|
||||
++atpos;
|
||||
} else {
|
||||
IsDefault = false;
|
||||
}
|
||||
Version = Name.substr(atpos);
|
||||
return object_error::success;
|
||||
}
|
||||
|
||||
// This is a dynamic symbol. Look in the GNU symbol version table.
|
||||
if (dot_gnu_version_sec == NULL) {
|
||||
// No version table.
|
||||
Version = "";
|
||||
IsDefault = false;
|
||||
return object_error::success;
|
||||
}
|
||||
|
||||
// Determine the position in the symbol table of this entry.
|
||||
const char *sec_start = (const char*)base() + section->sh_offset;
|
||||
size_t entry_index = ((const char*)symb - sec_start)/section->sh_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) {
|
||||
Version = "";
|
||||
IsDefault = false;
|
||||
return object_error::success;
|
||||
}
|
||||
|
||||
// Lookup this symbol in the version table
|
||||
LoadVersionMap();
|
||||
if (version_index >= VersionMap.size() || VersionMap[version_index].isNull())
|
||||
report_fatal_error("Symbol has version index without corresponding "
|
||||
"define or reference entry");
|
||||
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;
|
||||
}
|
||||
Version = getString(dot_dynstr_sec, name_offset);
|
||||
|
||||
// Set IsDefault
|
||||
if (entry.isVerdef()) {
|
||||
IsDefault = !(vs->vs_index & ELF::VERSYM_HIDDEN);
|
||||
} else {
|
||||
IsDefault = false;
|
||||
}
|
||||
|
||||
return object_error::success;
|
||||
}
|
||||
|
||||
template<support::endianness target_endianness, bool is64Bits>
|
||||
inline DynRefImpl<target_endianness, is64Bits>
|
||||
::DynRefImpl(DataRefImpl DynP, const OwningType *Owner)
|
||||
@ -1823,6 +2145,35 @@ inline DataRefImpl DynRefImpl<target_endianness, is64Bits>
|
||||
return DynPimpl;
|
||||
}
|
||||
|
||||
/// This is a generic interface for retrieving GNU symbol version
|
||||
/// information from an ELFObjectFile.
|
||||
static inline error_code GetELFSymbolVersion(const ObjectFile *Obj,
|
||||
const SymbolRef &Sym,
|
||||
StringRef &Version,
|
||||
bool &IsDefault) {
|
||||
// Little-endian 32-bit
|
||||
if (const ELFObjectFile<support::little, false> *ELFObj =
|
||||
dyn_cast<ELFObjectFile<support::little, false> >(Obj))
|
||||
return ELFObj->getSymbolVersion(Sym, Version, IsDefault);
|
||||
|
||||
// Big-endian 32-bit
|
||||
if (const ELFObjectFile<support::big, false> *ELFObj =
|
||||
dyn_cast<ELFObjectFile<support::big, false> >(Obj))
|
||||
return ELFObj->getSymbolVersion(Sym, Version, IsDefault);
|
||||
|
||||
// Little-endian 64-bit
|
||||
if (const ELFObjectFile<support::little, true> *ELFObj =
|
||||
dyn_cast<ELFObjectFile<support::little, true> >(Obj))
|
||||
return ELFObj->getSymbolVersion(Sym, Version, IsDefault);
|
||||
|
||||
// Big-endian 64-bit
|
||||
if (const ELFObjectFile<support::big, true> *ELFObj =
|
||||
dyn_cast<ELFObjectFile<support::big, true> >(Obj))
|
||||
return ELFObj->getSymbolVersion(Sym, Version, IsDefault);
|
||||
|
||||
llvm_unreachable("Object passed to GetELFSymbolVersion() is not ELF");
|
||||
}
|
||||
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
@ -734,6 +734,9 @@ enum {
|
||||
SHT_GROUP = 17, // Section group.
|
||||
SHT_SYMTAB_SHNDX = 18, // Indices for SHN_XINDEX entries.
|
||||
SHT_LOOS = 0x60000000, // Lowest operating system-specific type.
|
||||
SHT_GNU_verdef = 0x6ffffffd, // GNU version definitions.
|
||||
SHT_GNU_verneed = 0x6ffffffe, // GNU version references.
|
||||
SHT_GNU_versym = 0x6fffffff, // GNU symbol versions table.
|
||||
SHT_HIOS = 0x6fffffff, // Highest operating system-specific type.
|
||||
SHT_LOPROC = 0x70000000, // Lowest processor architecture-specific type.
|
||||
// Fixme: All this is duplicated in MCSectionELF. Why??
|
||||
@ -1102,6 +1105,33 @@ enum {
|
||||
DF_STATIC_TLS = 0x10 // Reject attempts to load dynamically.
|
||||
};
|
||||
|
||||
// ElfXX_VerDef structure version (GNU versioning)
|
||||
enum {
|
||||
VER_DEF_NONE = 0,
|
||||
VER_DEF_CURRENT = 1
|
||||
};
|
||||
|
||||
// VerDef Flags (ElfXX_VerDef::vd_flags)
|
||||
enum {
|
||||
VER_FLG_BASE = 0x1,
|
||||
VER_FLG_WEAK = 0x2,
|
||||
VER_FLG_INFO = 0x4
|
||||
};
|
||||
|
||||
// Special constants for the version table. (SHT_GNU_versym/.gnu.version)
|
||||
enum {
|
||||
VER_NDX_LOCAL = 0, // Unversioned local symbol
|
||||
VER_NDX_GLOBAL = 1, // Unversioned global symbol
|
||||
VERSYM_VERSION = 0x7fff, // Version Index mask
|
||||
VERSYM_HIDDEN = 0x8000 // Hidden bit (non-default version)
|
||||
};
|
||||
|
||||
// ElfXX_VerNeed structure version (GNU versioning)
|
||||
enum {
|
||||
VER_NEED_NONE = 0,
|
||||
VER_NEED_CURRENT = 1
|
||||
};
|
||||
|
||||
} // end namespace ELF
|
||||
|
||||
} // end namespace llvm
|
||||
|
||||
BIN
test/Object/Inputs/elf-versioning-test.i386
Executable file
BIN
test/Object/Inputs/elf-versioning-test.i386
Executable file
Binary file not shown.
BIN
test/Object/Inputs/elf-versioning-test.x86_64
Executable file
BIN
test/Object/Inputs/elf-versioning-test.x86_64
Executable file
Binary file not shown.
31
test/Object/Inputs/elfver.S
Normal file
31
test/Object/Inputs/elfver.S
Normal file
@ -0,0 +1,31 @@
|
||||
# Compile with:
|
||||
# ARGS="-shared -nostdlib -Wl,--version-script=elfver.script"
|
||||
# clang $ARGS -m32 elfver.S -lc -o elf-versioning-test.i386
|
||||
# clang $ARGS -m64 elfver.S -lc -o elf-versioning-test.x86_64
|
||||
|
||||
# Also, strip off non-dynamic symbols:
|
||||
# strip elf-versioning-test.i386
|
||||
# strip elf-versioning-test.x86_64
|
||||
|
||||
#ifdef __i386__
|
||||
.symver _puts, puts@GLIBC_2.0
|
||||
#else
|
||||
.symver _puts, puts@GLIBC_2.2.5
|
||||
#endif
|
||||
call _puts@PLT
|
||||
|
||||
.symver foo1, foo@VER1
|
||||
.globl foo1
|
||||
.type foo1, @function
|
||||
foo1:
|
||||
ret
|
||||
|
||||
.symver foo2, foo@@VER2
|
||||
.globl foo2
|
||||
.type foo2, @function
|
||||
foo2:
|
||||
ret
|
||||
|
||||
.globl unversioned_define
|
||||
.type unversioned_define, @function
|
||||
unversioned_define:
|
||||
10
test/Object/Inputs/elfver.script
Normal file
10
test/Object/Inputs/elfver.script
Normal file
@ -0,0 +1,10 @@
|
||||
VER1 {
|
||||
global:
|
||||
foo;
|
||||
};
|
||||
|
||||
VER2 {
|
||||
global:
|
||||
foo;
|
||||
} VER1;
|
||||
|
||||
15
test/Object/readobj-elf-versioning.test
Normal file
15
test/Object/readobj-elf-versioning.test
Normal file
@ -0,0 +1,15 @@
|
||||
RUN: llvm-readobj %p/Inputs/elf-versioning-test.i386 \
|
||||
RUN: | FileCheck %s -check-prefix ELF
|
||||
RUN: llvm-readobj %p/Inputs/elf-versioning-test.i386 \
|
||||
RUN: | FileCheck %s -check-prefix ELF32
|
||||
RUN: llvm-readobj %p/Inputs/elf-versioning-test.x86_64 \
|
||||
RUN: | FileCheck %s -check-prefix ELF
|
||||
RUN: llvm-readobj %p/Inputs/elf-versioning-test.x86_64 \
|
||||
RUN: | FileCheck %s -check-prefix ELF64
|
||||
|
||||
ELF: foo@@VER2 FUNC {{[0-9a-f]+}} {{[0-9a-f]+}} {{[0-9a-f]+}} global
|
||||
ELF: foo@VER1 FUNC {{[0-9a-f]+}} {{[0-9a-f]+}} {{[0-9a-f]+}} global
|
||||
ELF: unversioned_define FUNC {{[0-9a-f]+}} {{[0-9a-f]+}} {{[0-9a-f]+}} global
|
||||
|
||||
ELF32: puts@GLIBC_2.0 FUNC {{[0-9a-f]+}} {{[0-9a-f]+}} {{[0-9a-f]+}} undef,global
|
||||
ELF64: puts@GLIBC_2.2.5 FUNC {{[0-9a-f]+}} {{[0-9a-f]+}} {{[0-9a-f]+}} undef,global
|
||||
@ -17,6 +17,7 @@
|
||||
//===----------------------------------------------------------------------===//
|
||||
|
||||
#include "llvm/Object/ObjectFile.h"
|
||||
#include "llvm/Object/ELF.h"
|
||||
#include "llvm/Analysis/Verifier.h"
|
||||
#include "llvm/ADT/Triple.h"
|
||||
#include "llvm/Support/Format.h"
|
||||
@ -78,22 +79,35 @@ std::string GetFlagStr(uint32_t Flags) {
|
||||
return result;
|
||||
}
|
||||
|
||||
void DumpSymbol(const SymbolRef &sym) {
|
||||
void DumpSymbol(const SymbolRef &Sym, const ObjectFile *obj, bool IsDynamic) {
|
||||
StringRef Name;
|
||||
SymbolRef::Type Type;
|
||||
uint32_t Flags;
|
||||
uint64_t Address;
|
||||
uint64_t Size;
|
||||
uint64_t FileOffset;
|
||||
sym.getName(Name);
|
||||
sym.getAddress(Address);
|
||||
sym.getSize(Size);
|
||||
sym.getFileOffset(FileOffset);
|
||||
sym.getType(Type);
|
||||
sym.getFlags(Flags);
|
||||
Sym.getName(Name);
|
||||
Sym.getAddress(Address);
|
||||
Sym.getSize(Size);
|
||||
Sym.getFileOffset(FileOffset);
|
||||
Sym.getType(Type);
|
||||
Sym.getFlags(Flags);
|
||||
std::string FullName = Name;
|
||||
|
||||
// If this is a dynamic symbol from an ELF object, append
|
||||
// the symbol's version to the name.
|
||||
if (IsDynamic && obj->isELF()) {
|
||||
StringRef Version;
|
||||
bool IsDefault;
|
||||
GetELFSymbolVersion(obj, Sym, Version, IsDefault);
|
||||
if (!Version.empty()) {
|
||||
FullName += (IsDefault ? "@@" : "@");
|
||||
FullName += Version;
|
||||
}
|
||||
}
|
||||
|
||||
// format() can't handle StringRefs
|
||||
outs() << format(" %-32s", Name.str().c_str())
|
||||
outs() << format(" %-32s", FullName.c_str())
|
||||
<< format(" %-4s", GetTypeStr(Type))
|
||||
<< format(" %16"PRIx64, Address)
|
||||
<< format(" %16"PRIx64, Size)
|
||||
@ -111,7 +125,7 @@ void DumpSymbols(const ObjectFile *obj) {
|
||||
symbol_iterator it = obj->begin_symbols();
|
||||
symbol_iterator ie = obj->end_symbols();
|
||||
while (it != ie) {
|
||||
DumpSymbol(*it);
|
||||
DumpSymbol(*it, obj, false);
|
||||
it.increment(ec);
|
||||
if (ec)
|
||||
report_fatal_error("Symbol iteration failed");
|
||||
@ -128,7 +142,7 @@ void DumpDynamicSymbols(const ObjectFile *obj) {
|
||||
symbol_iterator it = obj->begin_dynamic_symbols();
|
||||
symbol_iterator ie = obj->end_dynamic_symbols();
|
||||
while (it != ie) {
|
||||
DumpSymbol(*it);
|
||||
DumpSymbol(*it, obj, true);
|
||||
it.increment(ec);
|
||||
if (ec)
|
||||
report_fatal_error("Symbol iteration failed");
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user