[llvm-objdump] Should print unknown d_tag in hex format

Summary:
Currently, `llvm-objdump` prints "unknown" instead of d_tag value in hex format. Because getDynamicTagAsString returns "unknown" rather than empty 
string.

Reviewers: grimar, jhenderson

Reviewed By: jhenderson

Subscribers: rupprecht, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D58763

llvm-svn: 355262

1 files changed, 3 insertions, 3 deletions

diff --git a/llvm/lib/Object/ELF.cpp b/llvm/lib/Object/ELF.cpp
index 314be34ef59..dd8f3a9f331 100644
--- a/llvm/lib/Object/ELF.cpp
+++ b/llvm/lib/Object/ELF.cpp
@@ -424,7 +424,7 @@ ELFFile<ELFT>::android_relas(const Elf_Shdr *Sec) const {
 }
 
 template <class ELFT>
-const char *ELFFile<ELFT>::getDynamicTagAsString(unsigned Arch,
+std::string ELFFile<ELFT>::getDynamicTagAsString(unsigned Arch,
                                                  uint64_t Type) const {
 #define DYNAMIC_STRINGIFY_ENUM(tag, value)                                     \
   case value:                                                                  \
@@ -470,12 +470,12 @@ const char *ELFFile<ELFT>::getDynamicTagAsString(unsigned Arch,
 #undef DYNAMIC_TAG_MARKER
 #undef DYNAMIC_STRINGIFY_ENUM
   default:
-    return "unknown";
+    return "<unknown:>0x" + utohexstr(Type, true);
   }
 }
 
 template <class ELFT>
-const char *ELFFile<ELFT>::getDynamicTagAsString(uint64_t Type) const {
+std::string ELFFile<ELFT>::getDynamicTagAsString(uint64_t Type) const {
   return getDynamicTagAsString(getHeader()->e_machine, Type);
 }