From abc56c726178fc7c8a3f45185768426a6e9d584e Mon Sep 17 00:00:00 2001
From: John McCall <rjmccall@apple.com>
Date: Sat, 4 Dec 2010 06:09:13 +0000
Subject: [PATCH] When deciding whether to complain about the type of a boolean
 condition, use the type of the expression *after* array/function decay.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@120895 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Sema/SemaExpr.cpp      | 4 ++--
 test/Sema/exprs.c          | 9 +++++++++
 test/SemaCXX/condition.cpp | 9 +++++++++
 3 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/lib/Sema/SemaExpr.cpp b/lib/Sema/SemaExpr.cpp
index 8b29667bae..cf17566d41 100644
--- a/lib/Sema/SemaExpr.cpp
+++ b/lib/Sema/SemaExpr.cpp
@@ -9037,12 +9037,12 @@ bool Sema::CheckBooleanCondition(Expr *&E, SourceLocation Loc) {
       return Diag(E->getLocStart(), diag::err_invalid_use_of_bound_member_func)
         << E->getSourceRange();
 
-    QualType T = E->getType();
-
     if (getLangOptions().CPlusPlus)
       return CheckCXXBooleanCondition(E); // C++ 6.4p4
 
     DefaultFunctionArrayLvalueConversion(E);
+
+    QualType T = E->getType();
     if (!T->isScalarType()) // C99 6.8.4.1p1
       return Diag(Loc, diag::err_typecheck_statement_requires_scalar)
                << T << E->getSourceRange();
diff --git a/test/Sema/exprs.c b/test/Sema/exprs.c
index d6e17ff6ec..e88f7fc08b 100644
--- a/test/Sema/exprs.c
+++ b/test/Sema/exprs.c
@@ -157,3 +157,12 @@ void test21(volatile struct Test21 *ptr) {
   (test21_help(), *ptr); // expected-error {{incomplete type 'struct Test21' where a complete type is required}}
   (*ptr, test21_help()); // expected-error {{incomplete type 'struct Test21' where a complete type is required}}
 }
+
+// Make sure we do function/array decay.
+void test22() {
+  if ("help")
+    (void) 0;
+
+  if (test22)
+    (void) 0;
+}
diff --git a/test/SemaCXX/condition.cpp b/test/SemaCXX/condition.cpp
index daa86f62fc..61d1762be8 100644
--- a/test/SemaCXX/condition.cpp
+++ b/test/SemaCXX/condition.cpp
@@ -42,3 +42,12 @@ void test2() {
   if (int *ip = ip) {
   }
 }
+
+// Make sure we do function/array decay.
+void test3() {
+  if ("help")
+    (void) 0;
+
+  if (test3)
+    (void) 0;
+}
-- 
2.40.0