[llvm-readobj/llvm-readelf] - Implement GNU style dumper of the SHT_GNU_verneed section.
It was not implemented yet, we had only LLVM style dumper implemented.
Section description is here: https://refspecs.linuxfoundation.org/LSB_2.0.1/LSB-Core/LSB-Core/symverrqmts.html
Differential revision: https://reviews.llvm.org/D62516
llvm-svn: 362080
diff --git a/llvm/tools/llvm-readobj/ELFDumper.cpp b/llvm/tools/llvm-readobj/ELFDumper.cpp
index 047b463..fdef4b7 100644
--- a/llvm/tools/llvm-readobj/ELFDumper.cpp
+++ b/llvm/tools/llvm-readobj/ELFDumper.cpp
@@ -3424,22 +3424,30 @@
}
template <class ELFT>
+static void printGNUVersionSectionProlog(formatted_raw_ostream &OS,
+ const Twine &Name, unsigned EntriesNum,
+ const ELFFile<ELFT> *Obj,
+ const typename ELFT::Shdr *Sec) {
+ StringRef SecName = unwrapOrError(Obj->getSectionName(Sec));
+ OS << Name << " section '" << SecName << "' "
+ << "contains " << EntriesNum << " entries:\n";
+
+ const typename ELFT::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";
+}
+
+template <class ELFT>
void GNUStyle<ELFT>::printVersionSymbolSection(const ELFFile<ELFT> *Obj,
const Elf_Shdr *Sec) {
if (!Sec)
return;
- StringRef SecName = unwrapOrError(Obj->getSectionName(Sec));
- 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";
+ unsigned Entries = Sec->sh_size / sizeof(Elf_Versym);
+ printGNUVersionSectionProlog(OS, "Version symbols", Entries, Obj, Sec);
const uint8_t *VersymBuf =
reinterpret_cast<const uint8_t *>(Obj->base() + Sec->sh_offset);
@@ -3491,6 +3499,28 @@
StringRef SecName = unwrapOrError(Obj->getSectionName(Sec));
OS << "Dumper for " << SecName << " is not implemented\n";
+ OS << '\n';
+}
+
+static std::string verNeedFlagToString(unsigned Flags) {
+ if (Flags == 0)
+ return "none";
+
+ std::string Ret;
+ auto AddFlag = [&Ret, &Flags](unsigned Flag, StringRef Name) {
+ if (!(Flags & Flag))
+ return;
+ if (!Ret.empty())
+ Ret += " | ";
+ Ret += Name;
+ Flags &= ~Flag;
+ };
+
+ AddFlag(VER_FLG_BASE, "BASE");
+ AddFlag(VER_FLG_WEAK, "WEAK");
+ AddFlag(VER_FLG_INFO, "INFO");
+ AddFlag(~0, "<unknown>");
+ return Ret;
}
template <class ELFT>
@@ -3499,8 +3529,42 @@
if (!Sec)
return;
- StringRef SecName = unwrapOrError(Obj->getSectionName(Sec));
- OS << "Dumper for " << SecName << " is not implemented\n";
+ unsigned VerneedNum = Sec->sh_info;
+ printGNUVersionSectionProlog(OS, "Version needs", VerneedNum, Obj, Sec);
+
+ ArrayRef<uint8_t> SecData = unwrapOrError(Obj->getSectionContents(Sec));
+
+ const Elf_Shdr *StrTabSec = unwrapOrError(Obj->getSection(Sec->sh_link));
+ StringRef StringTable = {
+ reinterpret_cast<const char *>(Obj->base() + StrTabSec->sh_offset),
+ StrTabSec->sh_size};
+
+ const uint8_t *VerneedBuf = SecData.data();
+ for (unsigned I = 0; I < VerneedNum; ++I) {
+ const Elf_Verneed *Verneed =
+ reinterpret_cast<const Elf_Verneed *>(VerneedBuf);
+
+ OS << format(" 0x%04x: Version: %u File: %s Cnt: %u\n",
+ reinterpret_cast<const uint8_t *>(Verneed) - SecData.begin(),
+ (unsigned)Verneed->vn_version,
+ StringTable.drop_front(Verneed->vn_file).data(),
+ (unsigned)Verneed->vn_cnt);
+
+ const uint8_t *VernauxBuf = VerneedBuf + Verneed->vn_aux;
+ for (unsigned J = 0; J < Verneed->vn_cnt; ++J) {
+ const Elf_Vernaux *Vernaux =
+ reinterpret_cast<const Elf_Vernaux *>(VernauxBuf);
+
+ OS << format(" 0x%04x: Name: %s Flags: %s Version: %u\n",
+ reinterpret_cast<const uint8_t *>(Vernaux) - SecData.begin(),
+ StringTable.drop_front(Vernaux->vna_name).data(),
+ verNeedFlagToString(Vernaux->vna_flags).c_str(),
+ (unsigned)Vernaux->vna_other);
+ VernauxBuf += Vernaux->vna_next;
+ }
+ VerneedBuf += Verneed->vn_next;
+ }
+ OS << '\n';
}
// Hash histogram shows statistics of how efficient the hash was for the