Support all null pointer literals in format strings.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@150276 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 7 insertions, 8 deletions

diff --git a/lib/Sema/SemaChecking.cpp b/lib/Sema/SemaChecking.cpp
index be326880d5..cf0469592f 100644
--- a/lib/Sema/SemaChecking.cpp
+++ b/lib/Sema/SemaChecking.cpp
@@ -1369,6 +1369,13 @@ bool Sema::SemaCheckStringLiteral(const Expr *E, Expr **Args,
 
   E = E->IgnoreParenCasts();
 
+  if (E->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNotNull))
+    // Technically -Wformat-nonliteral does not warn about this case.
+    // The behavior of printf and friends in this case is implementation
+    // dependent.  Ideally if the format string cannot be null then
+    // it should have a 'nonnull' attribute in the function prototype.
+    return true;
+
   switch (E->getStmtClass()) {
   case Stmt::BinaryConditionalOperatorClass:
   case Stmt::ConditionalOperatorClass: {
@@ -1381,14 +1388,6 @@ bool Sema::SemaCheckStringLiteral(const Expr *E, Expr **Args,
                                  inFunctionCall);
   }
 
-  case Stmt::GNUNullExprClass:
-  case Stmt::IntegerLiteralClass:
-    // Technically -Wformat-nonliteral does not warn about this case.
-    // The behavior of printf and friends in this case is implementation
-    // dependent.  Ideally if the format string cannot be null then
-    // it should have a 'nonnull' attribute in the function prototype.
-    return true;
-
   case Stmt::ImplicitCastExprClass: {
     E = cast<ImplicitCastExpr>(E)->getSubExpr();
     goto tryAgain;