Reinstate the code for emitting an initial debug type for a struct,

to handle the case where the struct is only forward-declared. In
this case, a temporary MDNode is not needed and not desired.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@111842 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/CGDebugInfo.cpp b/lib/CodeGen/CGDebugInfo.cpp
index 81947f9ba34f81cca1b5807c69b7b5880e1be990..6b79b3ed43bb1cba09d1c9383c6312d1ce04fda3 100644 (file)
--- a/lib/CodeGen/CGDebugInfo.cpp
+++ b/lib/CodeGen/CGDebugInfo.cpp
@@ -977,6 +977,17 @@ llvm::DIType CGDebugInfo::CreateType(const ObjCInterfaceType *Ty,
   unsigned Line = getLineNumber(ID->getLocation());
   unsigned RuntimeLang = TheCU.getLanguage();
 
+  // If this is just a forward declaration, return a special forward-declaration
+  // debug type.
+  if (ID->isForwardDecl()) {
+    llvm::DICompositeType FwdDecl =
+      DebugFactory.CreateCompositeType(Tag, Unit, ID->getName(),
+                                       DefUnit, Line, 0, 0, 0, 0,
+                                       llvm::DIType(), llvm::DIArray(),
+                                       RuntimeLang);
+    return FwdDecl;
+  }
+
   // To handle recursive interface, we
   // first generate a debug descriptor for the struct as a forward declaration.
   // Then (if it is a definition) we go through and get debug info for all of
@@ -985,10 +996,6 @@ llvm::DIType CGDebugInfo::CreateType(const ObjCInterfaceType *Ty,
   // uses of the forward declaration with the final definition.
   llvm::DIType FwdDecl = DebugFactory.CreateTemporaryType();
 
-  // If this is just a forward declaration, return it.
-  if (ID->isForwardDecl())
-    return FwdDecl;
-
   llvm::MDNode *MN = FwdDecl;
   llvm::TrackingVH<llvm::MDNode> FwdDeclNode = MN;
   // Otherwise, insert it into the TypeCache so that recursive uses will find