[Object] Teach Object and llvm-objdump about ".hidden"

Differential Revision:	http://reviews.llvm.org/D9416
Reviewed by:	rafael

llvm-svn: 236279

4 files changed, 12 insertions, 2 deletions

diff --git a/llvm/include/llvm/Object/ELFObjectFile.h b/llvm/include/llvm/Object/ELFObjectFile.h
index 464efe87fe4..a6914d5a608 100644
--- a/llvm/include/llvm/Object/ELFObjectFile.h
+++ b/llvm/include/llvm/Object/ELFObjectFile.h
@@ -409,6 +409,9 @@ uint32_t ELFObjectFile<ELFT>::getSymbolFlags(DataRefImpl Symb) const {
   if (isExportedToOtherDSO(ESym))
     Result |= SymbolRef::SF_Exported;
 
+  if (ESym->getVisibility() == ELF::STV_HIDDEN)
+    Result |= SymbolRef::SF_Hidden;
+
   return Result;
 }
 
diff --git a/llvm/include/llvm/Object/SymbolicFile.h b/llvm/include/llvm/Object/SymbolicFile.h
index 114b229b822..2bfff4c6b5a 100644
--- a/llvm/include/llvm/Object/SymbolicFile.h
+++ b/llvm/include/llvm/Object/SymbolicFile.h
@@ -93,6 +93,7 @@ public:
     SF_FormatSpecific = 1U << 7, // Specific to the object file format
                                  // (e.g. section symbols)
     SF_Thumb = 1U << 8,          // Thumb symbol in a 32-bit ARM binary
+    SF_Hidden = 1U << 9,         // Symbol has hidden visibility
   };
 
   BasicSymbolRef() : OwningObject(nullptr) { }
diff --git a/llvm/test/Object/objdump-symbol-table.test b/llvm/test/Object/objdump-symbol-table.test
index c94b0777355..07109176638 100644
--- a/llvm/test/Object/objdump-symbol-table.test
+++ b/llvm/test/Object/objdump-symbol-table.test
@@ -37,5 +37,7 @@ macho-i386: 00000000         *UND*  00000000 _puts
 ELF-shared: shared-object-test.elf-i386:     file format
 ELF-shared: SYMBOL TABLE:
 ELF-shared: 00000200 l     F .text 00000003 local_func
+ELF-shared: 000012b8 l       *ABS* 00000000 .hidden _GLOBAL_OFFSET_TABLE_
+ELF-shared: 00001248 l       *ABS* 00000000 .hidden _DYNAMIC
 ELF-shared: 000012c4 g       .data 00000004 defined_sym
 ELF-shared: 000001f0 g     F .text 00000003 global_func
diff --git a/llvm/tools/llvm-objdump/llvm-objdump.cpp b/llvm/tools/llvm-objdump/llvm-objdump.cpp
index 71de8adca70..e442ac050fc 100644
--- a/llvm/tools/llvm-objdump/llvm-objdump.cpp
+++ b/llvm/tools/llvm-objdump/llvm-objdump.cpp
@@ -629,6 +629,7 @@ void llvm::PrintSymbolTable(const ObjectFile *o) {
     bool Weak = Flags & SymbolRef::SF_Weak;
     bool Absolute = Flags & SymbolRef::SF_Absolute;
     bool Common = Flags & SymbolRef::SF_Common;
+    bool Hidden = Flags & SymbolRef::SF_Hidden;
 
     if (Common) {
       uint32_t Alignment;
@@ -683,8 +684,11 @@ void llvm::PrintSymbolTable(const ObjectFile *o) {
       outs() << SectionName;
     }
     outs() << '\t'
-           << format("%08" PRIx64 " ", Size)
-           << Name
+           << format("%08" PRIx64 " ", Size);
+    if (Hidden) {
+      outs() << ".hidden ";
+    }
+    outs() << Name
            << '\n';
   }
 }