[Object] Add symbol attribute flags: ST_ThreadLocal, ST_Common, and ST_Undefined. Implement these completely for ELF.

Rename ST_External to ST_Unknown, and slightly change its semantics. It now only indicates that the symbol's type
is unknown, not that the symbol is undefined. (For that, use ST_Undefined).



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151696 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 9 insertions, 6 deletions

diff --git a/include/llvm/Object/ObjectFile.h b/include/llvm/Object/ObjectFile.h
index 284577c945..56d8c249c7 100644
--- a/include/llvm/Object/ObjectFile.h
+++ b/include/llvm/Object/ObjectFile.h
@@ -180,9 +180,9 @@ public:
   }
 
   enum Type {
+    ST_Unknown, // Type not specified
     ST_Data,
     ST_Debug,
-    ST_External,    // Defined in another object file
     ST_File,
     ST_Function,
     ST_Other
@@ -190,11 +190,14 @@ public:
 
   enum Flags {
     SF_None            = 0,
-    SF_Global          = 1 << 0, // Global symbol
-    SF_Weak            = 1 << 1, // Weak symbol
-    SF_Absolute        = 1 << 2, // Absolute symbol
-    SF_FormatSpecific  = 1 << 3  // Specific to the object file format
-                                 // (e.g. section symbols)
+    SF_Undefined       = 1U << 0,  // Symbol is defined in another object file
+    SF_Global          = 1U << 1,  // Global symbol
+    SF_Weak            = 1U << 2,  // Weak symbol
+    SF_Absolute        = 1U << 3,  // Absolute symbol
+    SF_ThreadLocal     = 1U << 4,  // Thread local symbol
+    SF_Common          = 1U << 5,  // Symbol has common linkage
+    SF_FormatSpecific  = 1U << 31  // Specific to the object file format
+                                   // (e.g. section symbols)
   };
 
   SymbolRef(DataRefImpl SymbolP, const ObjectFile *Owner);