1 files changed, 82 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/wnull-dereference.c b/gcc/testsuite/gcc.dg/tree-ssa/wnull-dereference.c
new file mode 100644
index 0000000..db36acc
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/wnull-dereference.c
@@ -0,0 +1,82 @@
+/* { dg-do compile } */ 
+/* PR c/16531 */
+/* { dg-options "-O2 -fdelete-null-pointer-checks -Wnull-dereference" } */
+/* { dg-skip-if "" keeps_null_pointer_checks } */
+
+#ifndef __cplusplus
+#define NULL (void *)0
+#else
+#define NULL nullptr
+#endif
+
+struct t
+{
+  int bar;
+};
+
+struct t2
+{
+  struct t *s;
+};
+
+void test1 ()
+{
+  struct t *s = NULL;
+  s->bar = 1;  /* { dg-warning "null" } */
+}
+
+void test2 (struct t *s)
+{
+  if (s == NULL && s->bar > 2)  /* { dg-warning "null" } */
+    return;
+
+  s->bar = 3;
+}
+
+void test3 (struct t *s)
+{
+  if (s != NULL || s->bar > 2)  /* { dg-warning "null" } */
+    return;
+
+  s->bar = 3;  /* { dg-warning "null" } */
+}
+
+int test4 (struct t *s)
+{
+  if (s != NULL && s->bar > 2)  /* { dg-bogus "null" } */
+    return 1;
+  return 0;
+}
+
+int test5 (struct t *s)
+{
+  if (s == NULL || s->bar > 2)  /* { dg-bogus "null" } */
+    return 1;
+  return 0;
+}
+
+int test6 (struct t2 *s)
+{
+  if (s->s == 0 && s->s->bar == 0)  /* { dg-warning "null" } */
+    return 1;
+  return 0;
+}
+
+int test7 (struct t *s)
+{
+  s = 0;
+  return s->bar;  /* { dg-warning "null" } */
+}
+
+int test8 ()
+{
+  return ((struct t *)0)->bar;  /* { dg-warning "null" } */
+}
+
+void test9 (struct t **s)
+{
+  if (s == 0)
+    *s = 0;  /* { dg-warning "null" } */
+}
+
+