add a new isNull() method to DeclGroupRef.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@68909 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 4 insertions, 2 deletions

diff --git a/include/clang/AST/DeclGroup.h b/include/clang/AST/DeclGroup.h
index 1a8546339b..65666899e2 100644
--- a/include/clang/AST/DeclGroup.h
+++ b/include/clang/AST/DeclGroup.h
@@ -84,6 +84,7 @@ public:
   typedef Decl** iterator;
   typedef Decl* const * const_iterator;
   
+  bool isNull() const { return D == 0; }
   bool isSingleDecl() const { return getKind() == SingleDeclKind; }
   bool isDeclGroup() const { return getKind() == DeclGroupKind; }
 
diff --git a/lib/Sema/SemaStmt.cpp b/lib/Sema/SemaStmt.cpp
index d2e158658c..1428c48847 100644
--- a/lib/Sema/SemaStmt.cpp
+++ b/lib/Sema/SemaStmt.cpp
@@ -40,10 +40,11 @@ Sema::OwningStmtResult Sema::ActOnNullStmt(SourceLocation SemiLoc) {
 Sema::OwningStmtResult Sema::ActOnDeclStmt(DeclGroupPtrTy dg,
                                            SourceLocation StartLoc,
                                            SourceLocation EndLoc) {
+  DeclGroupRef DG = dg.getAsVal<DeclGroupRef>();
+  
   // If we have an invalid decl, just return an error.
-  if (!dg) return StmtError();
+  if (DG.isNull()) return StmtError();
   
-  DeclGroupRef DG = dg.getAsVal<DeclGroupRef>();
   return Owned(new (Context) DeclStmt(DG, StartLoc, EndLoc));
 }