Make it possible to get an empty struct using

the new StructType::get method.  The second NULL
is to pacify the gcc warning mechanism.  This
patch compiles but is otherwise untested.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48645 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 6 insertions, 4 deletions

diff --git a/include/llvm/DerivedTypes.h b/include/llvm/DerivedTypes.h
index 7fc7ed6a91..5f4569cfd1 100644
--- a/include/llvm/DerivedTypes.h
+++ b/include/llvm/DerivedTypes.h
@@ -221,8 +221,9 @@ public:
                          bool isPacked=false);
 
   /// StructType::get - This static method is a convenience method for
-  /// creating structure types by specifying the elements as arguments.  Note
-  /// that this method always returns a non-packed struct.
+  /// creating structure types by specifying the elements as arguments.
+  /// Note that this method always returns a non-packed struct.  To get
+  /// an empty struct, pass NULL, NULL.
   static StructType *get(const Type *type, ...) END_WITH_NULL;
 
   // Iterator access to the elements
diff --git a/lib/VMCore/Type.cpp b/lib/VMCore/Type.cpp
index 4554826c34..829923e15a 100644
--- a/lib/VMCore/Type.cpp
+++ b/lib/VMCore/Type.cpp
@@ -1252,9 +1252,10 @@ StructType *StructType::get(const Type *type, ...) {
   va_list ap;
   std::vector<const llvm::Type*> StructFields;
   va_start(ap, type);
-  do {
+  while (type) {
     StructFields.push_back(type);
-  } while ((type = va_arg(ap, llvm::Type*)));
+    type = va_arg(ap, llvm::Type*);
+  }
   return llvm::StructType::get(StructFields);
 }