[llvm-readobj] Add GNU style dumper for .gnu.version section
Summary: Currently, `llvm-readobj` do not support GNU style dumper for symbol versioning sections. In this patch, I would like to implement dumper for `.gnu.version` section
Reviewers: jhenderson, rupprecht, grimar
Reviewed By: jhenderson, rupprecht
Subscribers: llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D59877
llvm-svn: 357578
diff --git a/llvm/tools/llvm-readobj/ELFDumper.cpp b/llvm/tools/llvm-readobj/ELFDumper.cpp
index ae7db58..67a88e3 100644
--- a/llvm/tools/llvm-readobj/ELFDumper.cpp
+++ b/llvm/tools/llvm-readobj/ELFDumper.cpp
@@ -3355,7 +3355,57 @@
return;
StringRef SecName = unwrapOrError(Obj->getSectionName(Sec));
- OS << "Dumper for " << SecName << " is not implemented\n";
+ uint64_t Entries = Sec->sh_size / sizeof(Elf_Versym);
+
+ OS << "Version symbols section '" << SecName << "' "
+ << "contains " << Entries << " entries:\n";
+
+ const Elf_Shdr *SymTab = unwrapOrError(Obj->getSection(Sec->sh_link));
+ StringRef SymTabName = unwrapOrError(Obj->getSectionName(SymTab));
+ OS << " Addr: " << format_hex_no_prefix(Sec->sh_addr, 16)
+ << " Offset: " << format_hex(Sec->sh_offset, 8)
+ << " Link: " << Sec->sh_link << " (" << SymTabName << ")\n";
+
+ const uint8_t *VersymBuf =
+ reinterpret_cast<const uint8_t *>(Obj->base() + Sec->sh_offset);
+ const ELFDumper<ELFT> *Dumper = this->dumper();
+ StringRef StrTable = Dumper->getDynamicStringTable();
+
+ // readelf prints 4 entries per line.
+ for (uint64_t VersymRow = 0; VersymRow < Entries; VersymRow += 4) {
+ OS << " " << format_hex_no_prefix(VersymRow, 3) << ":";
+
+ for (uint64_t VersymIndex = 0;
+ (VersymIndex < 4) && (VersymIndex + VersymRow) < Entries;
+ ++VersymIndex) {
+ const Elf_Versym *Versym =
+ reinterpret_cast<const Elf_Versym *>(VersymBuf);
+ switch (Versym->vs_index) {
+ case 0:
+ OS << " 0 (*local*) ";
+ break;
+ case 1:
+ OS << " 1 (*global*) ";
+ break;
+ default:
+ OS << format("%4x%c", Versym->vs_index & VERSYM_VERSION,
+ Versym->vs_index & VERSYM_HIDDEN ? 'h' : ' ');
+
+ bool IsDefault = true;
+ std::string VersionName = Dumper->getSymbolVersionByIndex(
+ StrTable, Versym->vs_index, IsDefault);
+
+ if (!VersionName.empty())
+ VersionName = "(" + VersionName + ")";
+ else
+ VersionName = "(*invalid*)";
+ OS << left_justify(VersionName, 13);
+ }
+ VersymBuf += sizeof(Elf_Versym);
+ }
+ OS << '\n';
+ }
+ OS << '\n';
}
template <class ELFT>