From 9b12559c4fc9b64fdd4ba3fe1f844fcf6754d223 Mon Sep 17 00:00:00 2001
From: Devang Patel <dpatel@apple.com>
Date: Tue, 10 Aug 2010 20:01:20 +0000
Subject: [PATCH] Do not forget debug info for enums. Use named mdnode to keep
 track of these types.

llvm-svn: 110712
---
 lib/Analysis/DebugInfo.cpp            | 17 +++++++++++++++--
 lib/CodeGen/AsmPrinter/DwarfDebug.cpp |  5 +++++
 2 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/lib/Analysis/DebugInfo.cpp b/lib/Analysis/DebugInfo.cpp
index 337dc3fc3d2..2bf87da5fa4 100644
--- a/lib/Analysis/DebugInfo.cpp
+++ b/lib/Analysis/DebugInfo.cpp
@@ -923,7 +923,14 @@ DICompositeType DIFactory::CreateCompositeType(unsigned Tag,
     ConstantInt::get(Type::getInt32Ty(VMContext), RuntimeLang),
     ContainingType
   };
-  return DICompositeType(MDNode::get(VMContext, &Elts[0], 13));
+
+  MDNode *Node = MDNode::get(VMContext, &Elts[0], 13);
+  // Create a named metadata so that we do not lose this enum info.
+  if (Tag == dwarf::DW_TAG_enumeration_type) {
+    NamedMDNode *NMD = M.getOrInsertNamedMetadata("llvm.dbg.enum");
+    NMD->addOperand(Node);
+  }
+  return DICompositeType(Node);
 }
 
 
@@ -955,7 +962,13 @@ DICompositeType DIFactory::CreateCompositeTypeEx(unsigned Tag,
     Elements,
     ConstantInt::get(Type::getInt32Ty(VMContext), RuntimeLang)
   };
-  return DICompositeType(MDNode::get(VMContext, &Elts[0], 12));
+  MDNode *Node = MDNode::get(VMContext, &Elts[0], 12);
+  // Create a named metadata so that we do not lose this enum info.
+  if (Tag == dwarf::DW_TAG_enumeration_type) {
+    NamedMDNode *NMD = M.getOrInsertNamedMetadata("llvm.dbg.enum");
+    NMD->addOperand(Node);
+  }
+  return DICompositeType(Node);
 }
 
 
diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index e0a43a93d4f..e236c1b227e 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -2019,6 +2019,11 @@ void DwarfDebug::beginModule(Module *M) {
          E = DbgFinder.global_variable_end(); I != E; ++I)
     constructGlobalVariableDIE(*I);
 
+  //getOrCreateTypeDIE
+  if (NamedMDNode *NMD = M->getNamedMetadata("llvm.dbg.enum"))
+    for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i)
+      getOrCreateTypeDIE(DIType(NMD->getOperand(i)));
+
   // Prime section data.
   SectionMap.insert(Asm->getObjFileLowering().getTextSection());