Add support for metadata attachments for global variables.

This patch adds an IR, assembly and bitcode representation for metadata
attachments for globals. Future patches will port existing features to use
these new attachments.

Differential Revision: http://reviews.llvm.org/D20074

llvm-svn: 271348

1 files changed, 17 insertions, 7 deletions

diff --git a/llvm/lib/AsmParser/LLParser.cpp b/llvm/lib/AsmParser/LLParser.cpp
index 3f9ea57..09d012d 100644
--- a/llvm/lib/AsmParser/LLParser.cpp
+++ b/llvm/lib/AsmParser/LLParser.cpp
@@ -891,6 +891,9 @@ bool LLParser::ParseGlobal(const std::string &Name, LocTy NameLoc,
       unsigned Alignment;
       if (ParseOptionalAlignment(Alignment)) return true;
       GV->setAlignment(Alignment);
+    } else if (Lex.getKind() == lltok::MetadataVar) {
+      if (ParseGlobalObjectMetadataAttachment(*GV))
+        return true;
     } else {
       Comdat *C;
       if (parseOptionalComdat(Name, C))
@@ -1708,17 +1711,24 @@ bool LLParser::ParseInstructionMetadata(Instruction &Inst) {
   return false;
 }
 
+/// ParseGlobalObjectMetadataAttachment
+///   ::= !dbg !57
+bool LLParser::ParseGlobalObjectMetadataAttachment(GlobalObject &GO) {
+  unsigned MDK;
+  MDNode *N;
+  if (ParseMetadataAttachment(MDK, N))
+    return true;
+
+  GO.setMetadata(MDK, N);
+  return false;
+}
+
 /// ParseOptionalFunctionMetadata
 ///   ::= (!dbg !57)*
 bool LLParser::ParseOptionalFunctionMetadata(Function &F) {
-  while (Lex.getKind() == lltok::MetadataVar) {
-    unsigned MDK;
-    MDNode *N;
-    if (ParseMetadataAttachment(MDK, N))
+  while (Lex.getKind() == lltok::MetadataVar)
+    if (ParseGlobalObjectMetadataAttachment(F))
       return true;
-
-    F.setMetadata(MDK, N);
-  }
   return false;
 }