clang/test/SemaCXX/attr-nonnull.cpp

   1 // RUN: %clang_cc1 -fsyntax-only -verify %s
   2 // RUN: %clang_cc1 -fsyntax-only -verify %s -fexperimental-new-constant-interpreter
   3 struct S {
   4   S(const char *) __attribute__((nonnull(2)));
   5
   6   static void f(const char*, const char*) __attribute__((nonnull(1)));
   7
   8   // GCC has a hidden 'this' argument in member functions, so the middle
   9   // argument is the one that must not be null.
  10   void g(const char*, const char*, const char*) __attribute__((nonnull(3)));
  11
  12   void h(const char*) __attribute__((nonnull(1))); // \
  13       expected-error{{invalid for the implicit this argument}}
  14 };
  15
  16 void test() {
  17   S s(0); // expected-warning{{null passed}}
  18
  19   s.f(0, ""); // expected-warning{{null passed}}
  20   s.f("", 0);
  21   s.g("", 0, ""); // expected-warning{{null passed}}
  22   s.g(0, "", 0);
  23 }
  24
  25 namespace rdar8769025 {
  26   __attribute__((nonnull)) void f0(int *&p);
  27   __attribute__((nonnull)) void f1(int * const &p);
  28   __attribute__((nonnull(2))) void f2(int i, int * const &p);
  29
  30   void test_f1() {
  31     f1(0); // expected-warning{{null passed to a callee that requires a non-null argument}}
  32     f2(0, 0); // expected-warning{{null passed to a callee that requires a non-null argument}}
  33   }
  34 }
  35
  36 namespace test3 {
  37 __attribute__((nonnull(1))) void f(void *ptr);
  38
  39 void g() {
  40   f(static_cast<char*>((void*)0));  // expected-warning{{null passed}}
  41   f(static_cast<char*>(0));  // expected-warning{{null passed}}
  42 }
  43 }
  44
  45 namespace test4 {
  46 struct X {
  47   bool operator!=(const void *) const __attribute__((nonnull(2)));
  48 };
  49 bool operator==(const X&, const void *) __attribute__((nonnull(2)));
  50
  51 void test(const X& x) {
  52   (void)(x == 0);  // expected-warning{{null passed}}
  53   (void)(x != 0);  // expected-warning{{null passed}}
  54 }
  55 }
  56
  57 namespace test5 {
  58
  59 constexpr int c = 0;
  60
  61 __attribute__((nonnull))
  62 constexpr int f1(const int*, const int*) {
  63   return 0;
  64 }
  65 constexpr int i1 = f1(&c, &c);
  66 constexpr int i12 = f1(&c, 0); //expected-error {{constant expression}} expected-note {{null passed}}
  67
  68 constexpr int f2(const int*, const int*) {
  69   return 0;
  70 }
  71 constexpr int i2 = f2(0, 0);
  72
  73 __attribute__((nonnull(2)))
  74 constexpr int f3(const int*, const int*) {
  75   return 0;
  76 }
  77 constexpr int i3 = f3(&c, 0); //expected-error {{constant expression}} expected-note {{null passed}}
  78 constexpr int i32 = f3(0, &c);
  79
  80 __attribute__((nonnull(4))) __attribute__((nonnull)) //expected-error {{out of bounds}}
  81 constexpr int f4(const int*, const int*, int) {
  82   return 0;
  83 }
  84 constexpr int i4 = f4(&c, 0, 0); //expected-error {{constant expression}} expected-note {{null passed}}
  85 constexpr int i42 = f4(0, &c, 1); //expected-error {{constant expression}} expected-note {{null passed}}
  86 constexpr int i43 = f4(&c, &c, 0);
  87
  88 }