Fix a couple bugs in the way we handle array indexes in array bounds checking. Specifically, make sure we don't ignore explicit casts in indexes, and make sure we use unsigned extension/comparisons on indexes. Fixes <rdar://problem/10916006>.

llvm-svn: 151569

1 files changed, 6 insertions, 0 deletions

diff --git a/clang/test/SemaCXX/array-bounds.cpp b/clang/test/SemaCXX/array-bounds.cpp
index c1b37011727..57a9e3de6a2 100644
--- a/clang/test/SemaCXX/array-bounds.cpp
+++ b/clang/test/SemaCXX/array-bounds.cpp
@@ -247,3 +247,9 @@ void test_pr11007() {
   double a[5]; // expected-note {{array 'a' declared here}}
   test_pr11007_aux("foo", a[1000]); // expected-warning {{array index 1000 is past the end of the array}}
 }
+
+void test_rdar10916006(void)
+{
+	int a[128]; // expected-note {{array 'a' declared here}}
+	a[(unsigned char)'\xA1'] = 1; // expected-warning {{array index 161 is past the end of the array}}
+}