[Sema] Suppress warnings for C's zero initializer

Patch by S. Gilles!

Differential Revision: https://reviews.llvm.org/D28148

llvm-svn: 314499

1 files changed, 11 insertions, 0 deletions

diff --git a/clang/lib/AST/Expr.cpp b/clang/lib/AST/Expr.cpp
index aab89d392dc..9181176bbd9 100644
--- a/clang/lib/AST/Expr.cpp
+++ b/clang/lib/AST/Expr.cpp
@@ -1951,6 +1951,17 @@ bool InitListExpr::isTransparent() const {
          getInit(0)->getType().getCanonicalType();
 }
 
+bool InitListExpr::isIdiomaticZeroInitializer(const LangOptions &LangOpts) const {
+  assert(isSyntacticForm() && "only test syntactic form as zero initializer");
+
+  if (LangOpts.CPlusPlus || getNumInits() != 1) {
+    return false;
+  }
+
+  const IntegerLiteral *Lit = dyn_cast<IntegerLiteral>(getInit(0));
+  return Lit && Lit->getValue() == 0;
+}
+
 SourceLocation InitListExpr::getLocStart() const {
   if (InitListExpr *SyntacticForm = getSyntacticForm())
     return SyntacticForm->getLocStart();