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[llvm-readobj] - Teach llvm-readobj to dump .gnu.version_r sections

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SHT_GNU_verneed (.gnu.version_r) is a version dependency section.
It was the last symbol versioning relative section that was not dumped,
now it is.

Differential revision: http://reviews.llvm.org/D21024

llvm-svn: 271998
This commit is contained in:
George Rimar 2016-06-07 11:04:49 +00:00
parent d64bc3ec0b
commit 37a7f50a87
3 changed files with 88 additions and 0 deletions
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BIN
test/tools/llvm-readobj/Inputs/verneed.elf-x86-64 Normal file
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33
test/tools/llvm-readobj/elf-versioninfo.test
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@ -82,3 +82,36 @@ CHECK-NEXT: Name: VERSION2
CHECK-NEXT: }
CHECK-NEXT: ]
CHECK-NEXT: }
RUN: llvm-readobj -V %p/Inputs/verneed.elf-x86-64 | FileCheck %s --check-prefix=VERNEED
VERNEED: SHT_GNU_verneed {
VERNEED-NEXT: Dependency {
VERNEED-NEXT: Version: 1
VERNEED-NEXT: Count: 2
VERNEED-NEXT: FileName: verneed1.so.0
VERNEED-NEXT: Entry {
VERNEED-NEXT: Hash: 1938
VERNEED-NEXT: Flags: 0x0
VERNEED-NEXT: Index: 3
VERNEED-NEXT: Name: v2
VERNEED-NEXT: }
VERNEED-NEXT: Entry {
VERNEED-NEXT: Hash: 1939
VERNEED-NEXT: Flags: 0x0
VERNEED-NEXT: Index: 2
VERNEED-NEXT: Name: v3
VERNEED-NEXT: }
VERNEED-NEXT: }
VERNEED-NEXT: Dependency {
VERNEED-NEXT: Version: 1
VERNEED-NEXT: Count: 1
VERNEED-NEXT: FileName: verneed2.so.0
VERNEED-NEXT: Entry {
VERNEED-NEXT: Hash: 1937
VERNEED-NEXT: Flags: 0x0
VERNEED-NEXT: Index: 4
VERNEED-NEXT: Name: v1
VERNEED-NEXT: }
VERNEED-NEXT: }
VERNEED-NEXT: }

55
tools/llvm-readobj/ELFDumper.cpp
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@ -520,6 +520,11 @@ static void printVersionSymbolSection(ELFDumper<ELFT> *Dumper, const ELFO *Obj,
}
}
static const EnumEntry<unsigned> SymVersionFlags[] = {
{"Base", "BASE", VER_FLG_BASE},
{"Weak", "WEAK", VER_FLG_WEAK},
{"Info", "INFO", VER_FLG_INFO}};
template <typename ELFO, class ELFT>
static void printVersionDefinitionSection(ELFDumper<ELFT> *Dumper,
const ELFO *Obj,
@ -568,12 +573,62 @@ static void printVersionDefinitionSection(ELFDumper<ELFT> *Dumper,
}
}
template <typename ELFO, class ELFT>
static void printVersionDependencySection(ELFDumper<ELFT> *Dumper,
const ELFO *Obj,
const typename ELFO::Elf_Shdr *Sec,
ScopedPrinter &W) {
typedef typename ELFO::Elf_Verneed VerNeed;
typedef typename ELFO::Elf_Vernaux VernAux;
DictScope SD(W, "SHT_GNU_verneed");
if (!Sec)
return;
unsigned VerNeedNum = 0;
for (const typename ELFO::Elf_Dyn &Dyn : Dumper->dynamic_table())
if (Dyn.d_tag == DT_VERNEEDNUM)
VerNeedNum = Dyn.d_un.d_val;
const uint8_t *SecData = (const uint8_t *)Obj->base() + Sec->sh_offset;
const typename ELFO::Elf_Shdr *StrTab =
unwrapOrError(Obj->getSection(Sec->sh_link));
const uint8_t *P = SecData;
for (unsigned I = 0; I < VerNeedNum; ++I) {
const VerNeed *Need = reinterpret_cast<const VerNeed *>(P);
DictScope Entry(W, "Dependency");
W.printNumber("Version", Need->vn_version);
W.printNumber("Count", Need->vn_cnt);
W.printString("FileName",
StringRef((const char *)(Obj->base() + StrTab->sh_offset +
Need->vn_file)));
const uint8_t *PAux = P + Need->vn_aux;
for (unsigned J = 0; J < Need->vn_cnt; ++J) {
const VernAux *Aux = reinterpret_cast<const VernAux *>(PAux);
DictScope Entry(W, "Entry");
W.printNumber("Hash", Aux->vna_hash);
W.printEnum("Flags", Aux->vna_flags, makeArrayRef(SymVersionFlags));
W.printNumber("Index", Aux->vna_other);
W.printString("Name",
StringRef((const char *)(Obj->base() + StrTab->sh_offset +
Aux->vna_name)));
PAux += Aux->vna_next;
}
P += Need->vn_next;
}
}
template <typename ELFT> void ELFDumper<ELFT>::printVersionInfo() {
// Dump version symbol section.
printVersionSymbolSection(this, Obj, dot_gnu_version_sec, W);
// Dump version definition section.
printVersionDefinitionSection(this, Obj, dot_gnu_version_d_sec, W);
// Dump version dependency section.
printVersionDependencySection(this, Obj, dot_gnu_version_r_sec, W);
}
template <typename ELFT>