clang/test/SemaCXX/attr-nonnull.cpp

   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 that requires a non-null argument}}
  31     f2(0, 0); // expected-warning{{null passed to a callee that 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
  56 namespace test5 {
  57
  58 constexpr int c = 0;
  59
  60 __attribute__((nonnull))
  61 constexpr int f1(const int*, const int*) {
  62   return 0;
  63 }
  64 constexpr int i1 = f1(&c, &c);
  65 constexpr int i12 = f1(&c, 0); //expected-error {{constant expression}} expected-note {{null passed}}
  66
  67 constexpr int f2(const int*, const int*) {
  68   return 0;
  69 }
  70 constexpr int i2 = f2(0, 0);
  71
  72 __attribute__((nonnull(2)))
  73 constexpr int f3(const int*, const int*) {
  74   return 0;
  75 }
  76 constexpr int i3 = f3(&c, 0); //expected-error {{constant expression}} expected-note {{null passed}}
  77 constexpr int i32 = f3(0, &c);
  78
  79 __attribute__((nonnull(4))) __attribute__((nonnull)) //expected-error {{out of bounds}}
  80 constexpr int f4(const int*, const int*, int) {
  81   return 0;
  82 }
  83 constexpr int i4 = f4(&c, 0, 0); //expected-error {{constant expression}} expected-note {{null passed}}
  84 constexpr int i42 = f4(0, &c, 1); //expected-error {{constant expression}} expected-note {{null passed}}
  85 constexpr int i43 = f4(&c, &c, 0);
  86
  87 }