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      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