add_symbol_to_map(const elf_symbol_sptr& sym,
string_elf_symbols_map_type& map);
-static bool
-get_symbol_versionning_sections(Elf* elf_handle,
- Elf_Scn*& versym_section,
- Elf_Scn*& verdef_section,
- Elf_Scn*& verneed_section);
-
static bool
get_parent_die(const read_context& ctxt,
const Dwarf_Die* die,
return symbol_name == name;
}
-/// Return the SHT_GNU_versym, SHT_GNU_verdef and SHT_GNU_verneed
-/// sections that are involved in symbol versionning.
-///
-/// @param elf_handle the elf handle to use.
-///
-/// @param versym_section the SHT_GNU_versym section found. If the
-/// section wasn't found, this is set to nil.
-///
-/// @param verdef_section the SHT_GNU_verdef section found. If the
-/// section wasn't found, this is set to nil.
-///
-/// @param verneed_section the SHT_GNU_verneed section found. If the
-/// section wasn't found, this is set to nil.
-///
-/// @return true iff at least one of the sections where found.
-static bool
-get_symbol_versionning_sections(Elf* elf_handle,
- Elf_Scn*& versym_section,
- Elf_Scn*& verdef_section,
- Elf_Scn*& verneed_section)
-{
- Elf_Scn* section = NULL;
- GElf_Shdr mem;
- Elf_Scn* versym = NULL, *verdef = NULL, *verneed = NULL;
-
- while ((section = elf_nextscn(elf_handle, section)) != NULL)
- {
- GElf_Shdr* h = gelf_getshdr(section, &mem);
- if (h->sh_type == SHT_GNU_versym)
- versym = section;
- else if (h->sh_type == SHT_GNU_verdef)
- verdef = section;
- else if (h->sh_type == SHT_GNU_verneed)
- verneed = section;
- }
-
- if (versym || verdef || verneed)
- {
- // At least one the versionning sections was found. Return it.
- versym_section = versym;
- verdef_section = verdef;
- verneed_section = verneed;
- return true;
- }
-
- return false;
-}
-
-/// Get the version definition (from the SHT_GNU_verdef section) of a
-/// given symbol represented by a pointer to GElf_Versym.
-///
-/// @param elf_hande the elf handle to use.
-///
-/// @param versym the symbol to get the version definition for.
-///
-/// @param verdef_section the SHT_GNU_verdef section.
-///
-/// @param version the resulting version definition. This is set iff
-/// the function returns true.
-///
-/// @return true upon successful completion, false otherwise.
-static bool
-get_version_definition_for_versym(Elf* elf_handle,
- GElf_Versym* versym,
- Elf_Scn* verdef_section,
- elf_symbol::version& version)
-{
- Elf_Data* verdef_data = elf_getdata(verdef_section, NULL);
- GElf_Verdef verdef_mem;
- GElf_Verdef* verdef = gelf_getverdef(verdef_data, 0, &verdef_mem);
- size_t vd_offset = 0;
-
- for (;; vd_offset += verdef->vd_next)
- {
- for (;verdef != 0;)
- {
- if (verdef->vd_ndx == (*versym & 0x7fff))
- // Found the version of the symbol.
- break;
- vd_offset += verdef->vd_next;
- verdef = (verdef->vd_next == 0
- ? 0
- : gelf_getverdef(verdef_data, vd_offset, &verdef_mem));
- }
-
- if (verdef != 0)
- {
- GElf_Verdaux verdaux_mem;
- GElf_Verdaux *verdaux = gelf_getverdaux(verdef_data,
- vd_offset + verdef->vd_aux,
- &verdaux_mem);
- GElf_Shdr header_mem;
- GElf_Shdr* verdef_section_header = gelf_getshdr(verdef_section,
- &header_mem);
- size_t verdef_stridx = verdef_section_header->sh_link;
- version.str(elf_strptr(elf_handle, verdef_stridx, verdaux->vda_name));
- if (*versym & 0x8000)
- version.is_default(false);
- else
- version.is_default(true);
- return true;
- }
- if (!verdef || verdef->vd_next == 0)
- break;
- }
- return false;
-}
-
-/// Get the version needed (from the SHT_GNU_verneed section) to
-/// resolve an undefined symbol represented by a pointer to
-/// GElf_Versym.
-///
-/// @param elf_hande the elf handle to use.
-///
-/// @param versym the symbol to get the version definition for.
-///
-/// @param verneed_section the SHT_GNU_verneed section.
-///
-/// @param version the resulting version definition. This is set iff
-/// the function returns true.
-///
-/// @return true upon successful completion, false otherwise.
-static bool
-get_version_needed_for_versym(Elf* elf_handle,
- GElf_Versym* versym,
- Elf_Scn* verneed_section,
- elf_symbol::version& version)
-{
- if (versym == 0 || elf_handle == 0 || verneed_section == 0)
- return false;
-
- size_t vn_offset = 0;
- Elf_Data* verneed_data = elf_getdata(verneed_section, NULL);
- GElf_Verneed verneed_mem;
- GElf_Verneed* verneed = gelf_getverneed(verneed_data, 0, &verneed_mem);
-
- for (;verneed; vn_offset += verneed->vn_next)
- {
- size_t vna_offset = vn_offset;
- GElf_Vernaux vernaux_mem;
- GElf_Vernaux *vernaux = gelf_getvernaux(verneed_data,
- vn_offset + verneed->vn_aux,
- &vernaux_mem);
- for (;vernaux != 0 && verneed;)
- {
- if (vernaux->vna_other == *versym)
- // Found the version of the symbol.
- break;
- vna_offset += verneed->vn_next;
- verneed = (verneed->vn_next == 0
- ? 0
- : gelf_getverneed(verneed_data, vna_offset, &verneed_mem));
- }
-
- if (verneed != 0 && vernaux != 0 && vernaux->vna_other == *versym)
- {
- GElf_Shdr header_mem;
- GElf_Shdr* verneed_section_header = gelf_getshdr(verneed_section,
- &header_mem);
- size_t verneed_stridx = verneed_section_header->sh_link;
- version.str(elf_strptr(elf_handle,
- verneed_stridx,
- vernaux->vna_name));
- if (*versym & 0x8000)
- version.is_default(false);
- else
- version.is_default(true);
- return true;
- }
-
- if (!verneed || verneed->vn_next == 0)
- break;
- }
- return false;
-}
-
-/// Return the version for a symbol that is at a given index in its
-/// SHT_SYMTAB section.
-///
-/// @param elf_handle the elf handle to use.
-///
-/// @param symbol_index the index of the symbol to consider.
-///
-/// @param get_def_version if this is true, it means that that we want
-/// the version for a defined symbol; in that case, the version is
-/// looked for in a section of type SHT_GNU_verdef. Otherwise, if
-/// this parameter is false, this means that we want the version for
-/// an undefined symbol; in that case, the version is the needed one
-/// for the symbol to be resolved; so the version is looked fo in a
-/// section of type SHT_GNU_verneed.
-///
-/// @param version the version found for symbol at @p symbol_index.
-///
-/// @return true iff a version was found for symbol at index @p
-/// symbol_index.
-static bool
-get_version_for_symbol(Elf* elf_handle,
- size_t symbol_index,
- bool get_def_version,
- elf_symbol::version& version)
-{
- Elf_Scn *versym_section = NULL,
- *verdef_section = NULL,
- *verneed_section = NULL;
-
- if (!get_symbol_versionning_sections(elf_handle,
- versym_section,
- verdef_section,
- verneed_section))
- return false;
-
- GElf_Versym versym_mem;
- Elf_Data* versym_data = (versym_section)
- ? elf_getdata(versym_section, NULL)
- : NULL;
- GElf_Versym* versym = (versym_data)
- ? gelf_getversym(versym_data, symbol_index, &versym_mem)
- : NULL;
-
- if (versym == 0 || *versym <= 1)
- // I got these value from the code of readelf.c in elfutils.
- // Apparently, if the symbol version entry has these values, the
- // symbol must be discarded. This is not documented in the
- // official specification.
- return false;
-
- if (get_def_version)
- {
- if (*versym == 0x8001)
- // I got this value from the code of readelf.c in elfutils
- // too. It's not really documented in the official
- // specification.
- return false;
-
- if (verdef_section
- && get_version_definition_for_versym(elf_handle, versym,
- verdef_section, version))
- return true;
- }
- else
- {
- if (verneed_section
- && get_version_needed_for_versym(elf_handle, versym,
- verneed_section, version))
- return true;
- }
-
- return false;
-}
-
/// Lookup a symbol using the SysV ELF hash table.
///
/// Note that this function hasn't been tested. So it hasn't been
find_data1_section(Elf* elf_handle)
{return find_section(elf_handle, ".data1", SHT_PROGBITS);}
+/// Return the SHT_GNU_versym, SHT_GNU_verdef and SHT_GNU_verneed
+/// sections that are involved in symbol versionning.
+///
+/// @param elf_handle the elf handle to use.
+///
+/// @param versym_section the SHT_GNU_versym section found. If the
+/// section wasn't found, this is set to nil.
+///
+/// @param verdef_section the SHT_GNU_verdef section found. If the
+/// section wasn't found, this is set to nil.
+///
+/// @param verneed_section the SHT_GNU_verneed section found. If the
+/// section wasn't found, this is set to nil.
+///
+/// @return true iff at least one of the sections where found.
+bool
+get_symbol_versionning_sections(Elf* elf_handle,
+ Elf_Scn*& versym_section,
+ Elf_Scn*& verdef_section,
+ Elf_Scn*& verneed_section)
+{
+ Elf_Scn* section = NULL;
+ GElf_Shdr mem;
+ Elf_Scn* versym = NULL, *verdef = NULL, *verneed = NULL;
+
+ while ((section = elf_nextscn(elf_handle, section)) != NULL)
+ {
+ GElf_Shdr* h = gelf_getshdr(section, &mem);
+ if (h->sh_type == SHT_GNU_versym)
+ versym = section;
+ else if (h->sh_type == SHT_GNU_verdef)
+ verdef = section;
+ else if (h->sh_type == SHT_GNU_verneed)
+ verneed = section;
+ }
+
+ if (versym || verdef || verneed)
+ {
+ // At least one the versionning sections was found. Return it.
+ versym_section = versym;
+ verdef_section = verdef;
+ verneed_section = verneed;
+ return true;
+ }
+
+ return false;
+}
+
+/// Get the version definition (from the SHT_GNU_verdef section) of a
+/// given symbol represented by a pointer to GElf_Versym.
+///
+/// @param elf_hande the elf handle to use.
+///
+/// @param versym the symbol to get the version definition for.
+///
+/// @param verdef_section the SHT_GNU_verdef section.
+///
+/// @param version the resulting version definition. This is set iff
+/// the function returns true.
+///
+/// @return true upon successful completion, false otherwise.
+bool
+get_version_definition_for_versym(Elf* elf_handle,
+ GElf_Versym* versym,
+ Elf_Scn* verdef_section,
+ elf_symbol::version& version)
+{
+ Elf_Data* verdef_data = elf_getdata(verdef_section, NULL);
+ GElf_Verdef verdef_mem;
+ GElf_Verdef* verdef = gelf_getverdef(verdef_data, 0, &verdef_mem);
+ size_t vd_offset = 0;
+
+ for (;; vd_offset += verdef->vd_next)
+ {
+ for (;verdef != 0;)
+ {
+ if (verdef->vd_ndx == (*versym & 0x7fff))
+ // Found the version of the symbol.
+ break;
+ vd_offset += verdef->vd_next;
+ verdef = (verdef->vd_next == 0
+ ? 0
+ : gelf_getverdef(verdef_data, vd_offset, &verdef_mem));
+ }
+
+ if (verdef != 0)
+ {
+ GElf_Verdaux verdaux_mem;
+ GElf_Verdaux *verdaux = gelf_getverdaux(verdef_data,
+ vd_offset + verdef->vd_aux,
+ &verdaux_mem);
+ GElf_Shdr header_mem;
+ GElf_Shdr* verdef_section_header = gelf_getshdr(verdef_section,
+ &header_mem);
+ size_t verdef_stridx = verdef_section_header->sh_link;
+ version.str(elf_strptr(elf_handle, verdef_stridx, verdaux->vda_name));
+ if (*versym & 0x8000)
+ version.is_default(false);
+ else
+ version.is_default(true);
+ return true;
+ }
+ if (!verdef || verdef->vd_next == 0)
+ break;
+ }
+ return false;
+}
+
+/// Get the version needed (from the SHT_GNU_verneed section) to
+/// resolve an undefined symbol represented by a pointer to
+/// GElf_Versym.
+///
+/// @param elf_hande the elf handle to use.
+///
+/// @param versym the symbol to get the version definition for.
+///
+/// @param verneed_section the SHT_GNU_verneed section.
+///
+/// @param version the resulting version definition. This is set iff
+/// the function returns true.
+///
+/// @return true upon successful completion, false otherwise.
+bool
+get_version_needed_for_versym(Elf* elf_handle,
+ GElf_Versym* versym,
+ Elf_Scn* verneed_section,
+ elf_symbol::version& version)
+{
+ if (versym == 0 || elf_handle == 0 || verneed_section == 0)
+ return false;
+
+ size_t vn_offset = 0;
+ Elf_Data* verneed_data = elf_getdata(verneed_section, NULL);
+ GElf_Verneed verneed_mem;
+ GElf_Verneed* verneed = gelf_getverneed(verneed_data, 0, &verneed_mem);
+
+ for (;verneed; vn_offset += verneed->vn_next)
+ {
+ size_t vna_offset = vn_offset;
+ GElf_Vernaux vernaux_mem;
+ GElf_Vernaux *vernaux = gelf_getvernaux(verneed_data,
+ vn_offset + verneed->vn_aux,
+ &vernaux_mem);
+ for (;vernaux != 0 && verneed;)
+ {
+ if (vernaux->vna_other == *versym)
+ // Found the version of the symbol.
+ break;
+ vna_offset += verneed->vn_next;
+ verneed = (verneed->vn_next == 0
+ ? 0
+ : gelf_getverneed(verneed_data, vna_offset, &verneed_mem));
+ }
+
+ if (verneed != 0 && vernaux != 0 && vernaux->vna_other == *versym)
+ {
+ GElf_Shdr header_mem;
+ GElf_Shdr* verneed_section_header = gelf_getshdr(verneed_section,
+ &header_mem);
+ size_t verneed_stridx = verneed_section_header->sh_link;
+ version.str(elf_strptr(elf_handle,
+ verneed_stridx,
+ vernaux->vna_name));
+ if (*versym & 0x8000)
+ version.is_default(false);
+ else
+ version.is_default(true);
+ return true;
+ }
+
+ if (!verneed || verneed->vn_next == 0)
+ break;
+ }
+ return false;
+}
+
+/// Return the version for a symbol that is at a given index in its
+/// SHT_SYMTAB section.
+///
+/// @param elf_handle the elf handle to use.
+///
+/// @param symbol_index the index of the symbol to consider.
+///
+/// @param get_def_version if this is true, it means that that we want
+/// the version for a defined symbol; in that case, the version is
+/// looked for in a section of type SHT_GNU_verdef. Otherwise, if
+/// this parameter is false, this means that we want the version for
+/// an undefined symbol; in that case, the version is the needed one
+/// for the symbol to be resolved; so the version is looked fo in a
+/// section of type SHT_GNU_verneed.
+///
+/// @param version the version found for symbol at @p symbol_index.
+///
+/// @return true iff a version was found for symbol at index @p
+/// symbol_index.
+bool
+get_version_for_symbol(Elf* elf_handle,
+ size_t symbol_index,
+ bool get_def_version,
+ elf_symbol::version& version)
+{
+ Elf_Scn *versym_section = NULL,
+ *verdef_section = NULL,
+ *verneed_section = NULL;
+
+ if (!get_symbol_versionning_sections(elf_handle,
+ versym_section,
+ verdef_section,
+ verneed_section))
+ return false;
+
+ GElf_Versym versym_mem;
+ Elf_Data* versym_data = (versym_section)
+ ? elf_getdata(versym_section, NULL)
+ : NULL;
+ GElf_Versym* versym = (versym_data)
+ ? gelf_getversym(versym_data, symbol_index, &versym_mem)
+ : NULL;
+
+ if (versym == 0 || *versym <= 1)
+ // I got these value from the code of readelf.c in elfutils.
+ // Apparently, if the symbol version entry has these values, the
+ // symbol must be discarded. This is not documented in the
+ // official specification.
+ return false;
+
+ if (get_def_version)
+ {
+ if (*versym == 0x8001)
+ // I got this value from the code of readelf.c in elfutils
+ // too. It's not really documented in the official
+ // specification.
+ return false;
+
+ if (verdef_section
+ && get_version_definition_for_versym(elf_handle, versym,
+ verdef_section, version))
+ return true;
+ }
+ else
+ {
+ if (verneed_section
+ && get_version_needed_for_versym(elf_handle, versym,
+ verneed_section, version))
+ return true;
+ }
+
+ return false;
+}
+
+
} // end namespace elf_helpers
} // end namespace abigail
Elf_Scn*
find_data1_section(Elf* elf_handle);
+bool
+get_symbol_versionning_sections(Elf* elf_handle,
+ Elf_Scn*& versym_section,
+ Elf_Scn*& verdef_section,
+ Elf_Scn*& verneed_section);
+
+//
+// Helpers for symbol versioning
+//
+
+bool
+get_version_definition_for_versym(Elf* elf_handle,
+ GElf_Versym* versym,
+ Elf_Scn* verdef_section,
+ elf_symbol::version& version);
+
+bool
+get_version_needed_for_versym(Elf* elf_handle,
+ GElf_Versym* versym,
+ Elf_Scn* verneed_section,
+ elf_symbol::version& version);
+
+bool
+get_version_for_symbol(Elf* elf_handle,
+ size_t symbol_index,
+ bool get_def_version,
+ elf_symbol::version& version);
+
} // end namespace elf_helpers
} // end namespace abigail
git://sourceware.org / libabigail.git / commitdiff