1 // RUN: %clang_cc1 -fsyntax-only -verify %s
2 struct S {
3   S(const char *) __attribute__((nonnull(2)));
4 
5   static void f(const char*, const char*) __attribute__((nonnull(1)));
6 
7   // GCC has a hidden 'this' argument in member functions, so the middle
8   // argument is the one that must not be null.
9   void g(const char*, const char*, const char*) __attribute__((nonnull(3)));
10 
11   void h(const char*) __attribute__((nonnull(1))); // \
12       expected-error{{invalid for the implicit this argument}}
13 };
14 
15 void test() {
16   S s(0); // expected-warning{{null passed}}
17 
18   s.f(0, ""); // expected-warning{{null passed}}
19   s.f("", 0);
20   s.g("", 0, ""); // expected-warning{{null passed}}
21   s.g(0, "", 0);
22 }
23 
24 namespace rdar8769025 {
25   __attribute__((nonnull)) void f0(int *&p);
26   __attribute__((nonnull)) void f1(int * const &p);
27   __attribute__((nonnull(2))) void f2(int i, int * const &p);
28 
29   void test_f1() {
30     f1(0); // expected-warning{{null passed to a callee which requires a non-null argument}}
31     f2(0, 0); // expected-warning{{null passed to a callee which requires a non-null argument}}
32   }
33 }
34 
35 namespace test3 {
36 __attribute__((nonnull(1))) void f(void *ptr);
37 
38 void g() {
39   f(static_cast<char*>((void*)0));  // expected-warning{{null passed}}
40   f(static_cast<char*>(0));  // expected-warning{{null passed}}
41 }
42 }
43 
44 namespace test4 {
45 struct X {
46   bool operator!=(const void *) const __attribute__((nonnull(2)));
47 };
48 bool operator==(const X&, const void *) __attribute__((nonnull(2)));
49 
50 void test(const X& x) {
51   (void)(x == 0);  // expected-warning{{null passed}}
52   (void)(x != 0);  // expected-warning{{null passed}}
53 }
54 }
55