[llvm-objdump] Add dynamic section printing to private-headers option
Differential Revision: https://reviews.llvm.org/D49016
llvm-svn: 337902
diff --git a/llvm/tools/llvm-objdump/ELFDump.cpp b/llvm/tools/llvm-objdump/ELFDump.cpp
index 9475ab3..f4d3665 100644
--- a/llvm/tools/llvm-objdump/ELFDump.cpp
+++ b/llvm/tools/llvm-objdump/ELFDump.cpp
@@ -21,6 +21,77 @@
using namespace llvm;
using namespace llvm::object;
+template <class ELFT>
+Expected<StringRef> getDynamicStrTab(const ELFFile<ELFT> *Elf) {
+ typedef ELFFile<ELFT> ELFO;
+
+ auto DynamicEntriesOrError = Elf->dynamicEntries();
+ if (!DynamicEntriesOrError)
+ return DynamicEntriesOrError.takeError();
+
+ for (const typename ELFO::Elf_Dyn &Dyn : *DynamicEntriesOrError) {
+ if (Dyn.d_tag == ELF::DT_STRTAB) {
+ auto MappedAddrOrError = Elf->toMappedAddr(Dyn.getPtr());
+ if (!MappedAddrOrError)
+ consumeError(MappedAddrOrError.takeError());
+ return StringRef(reinterpret_cast<const char *>(*MappedAddrOrError));
+ }
+ }
+
+ // If the dynamic segment is not present, we fall back on the sections.
+ auto SectionsOrError = Elf->sections();
+ if (!SectionsOrError)
+ return SectionsOrError.takeError();
+
+ for (const typename ELFO::Elf_Shdr &Sec : *SectionsOrError) {
+ if (Sec.sh_type == ELF::SHT_DYNSYM)
+ return Elf->getStringTableForSymtab(Sec);
+ }
+
+ return createError("dynamic string table not found");
+}
+
+template <class ELFT>
+void printDynamicSection(const ELFFile<ELFT> *Elf, StringRef Filename) {
+ auto ProgramHeaderOrError = Elf->program_headers();
+ if (!ProgramHeaderOrError)
+ report_error(Filename, ProgramHeaderOrError.takeError());
+
+ auto DynamicEntriesOrError = Elf->dynamicEntries();
+ if (!DynamicEntriesOrError)
+ report_error(Filename, DynamicEntriesOrError.takeError());
+
+ outs() << "Dynamic Section:\n";
+ for (const auto &Dyn : *DynamicEntriesOrError) {
+ if (Dyn.d_tag == ELF::DT_NULL)
+ continue;
+
+ StringRef Str = StringRef(Elf->getDynamicTagAsString(Dyn.d_tag));
+
+ if (Str.empty()) {
+ std::string HexStr = utohexstr(static_cast<uint64_t>(Dyn.d_tag), true);
+ outs() << format(" 0x%-19s", HexStr.c_str());
+ } else {
+ // We use "-21" in order to match GNU objdump's output.
+ outs() << format(" %-21s", Str.data());
+ }
+
+ const char *Fmt =
+ ELFT::Is64Bits ? "0x%016" PRIx64 "\n" : "0x%08" PRIx64 "\n";
+ if (Dyn.d_tag == ELF::DT_NEEDED) {
+ Expected<StringRef> StrTabOrErr = getDynamicStrTab(Elf);
+ if (StrTabOrErr) {
+ const char *Data = StrTabOrErr.get().data();
+ outs() << (Data + Dyn.d_un.d_val) << "\n";
+ continue;
+ }
+ warn(errorToErrorCode(StrTabOrErr.takeError()).message());
+ consumeError(StrTabOrErr.takeError());
+ }
+ outs() << format(Fmt, (uint64_t)Dyn.d_un.d_val);
+ }
+}
+
template <class ELFT> void printProgramHeaders(const ELFFile<ELFT> *o) {
typedef ELFFile<ELFT> ELFO;
outs() << "Program Header:\n";
@@ -103,3 +174,21 @@
if (const ELF64BEObjectFile *ELFObj = dyn_cast<ELF64BEObjectFile>(Obj))
printProgramHeaders(ELFObj->getELFFile());
}
+
+void llvm::printELFDynamicSection(const object::ObjectFile *Obj) {
+ // Little-endian 32-bit
+ if (const ELF32LEObjectFile *ELFObj = dyn_cast<ELF32LEObjectFile>(Obj))
+ printDynamicSection(ELFObj->getELFFile(), Obj->getFileName());
+
+ // Big-endian 32-bit
+ if (const ELF32BEObjectFile *ELFObj = dyn_cast<ELF32BEObjectFile>(Obj))
+ printDynamicSection(ELFObj->getELFFile(), Obj->getFileName());
+
+ // Little-endian 64-bit
+ if (const ELF64LEObjectFile *ELFObj = dyn_cast<ELF64LEObjectFile>(Obj))
+ printDynamicSection(ELFObj->getELFFile(), Obj->getFileName());
+
+ // Big-endian 64-bit
+ if (const ELF64BEObjectFile *ELFObj = dyn_cast<ELF64BEObjectFile>(Obj))
+ printDynamicSection(ELFObj->getELFFile(), Obj->getFileName());
+}