1 // RUN: %clang_cc1 -fsyntax-only -verify %s 2 // rdar://9584012 3 4 typedef struct { 5 char *str; 6 } Class; 7 8 typedef union { 9 Class *object; 10 } Instance __attribute__((transparent_union)); 11 12 __attribute__((nonnull(1))) void Class_init(Instance this, char *str) { 13 this.object->str = str; 14 } 15 16 int main(void) { 17 Class *obj; 18 Class_init(0, "Hello World"); // expected-warning {{null passed to a callee that requires a non-null argument}} 19 Class_init(obj, "Hello World"); 20 } 21 22 void foo(const char *str) __attribute__((nonnull("foo"))); // expected-error{{'nonnull' attribute requires parameter 1 to be an integer constant}} 23 void bar(int i) __attribute__((nonnull(1))); // expected-warning {{'nonnull' attribute only applies to pointer arguments}} expected-warning {{'nonnull' attribute applied to function with no pointer arguments}} 24 25 void baz(__attribute__((nonnull)) const char *str); 26 void baz2(__attribute__((nonnull(1))) const char *str); // expected-warning {{'nonnull' attribute when used on parameters takes no arguments}} 27 void baz3(__attribute__((nonnull)) int x); // expected-warning {{'nonnull' attribute only applies to pointer arguments}} 28 29 void test_baz() { 30 baz(0); // expected-warning {{null passed to a callee that requires a non-null argument}} 31 baz2(0); // no-warning 32 baz3(0); // no-warning 33 } 34 35 void test_void_returns_nonnull(void) __attribute__((returns_nonnull)); // expected-warning {{'returns_nonnull' attribute only applies to return values that are pointers}} 36 int test_int_returns_nonnull(void) __attribute__((returns_nonnull)); // expected-warning {{'returns_nonnull' attribute only applies to return values that are pointers}} 37 void *test_ptr_returns_nonnull(void) __attribute__((returns_nonnull)); // no-warning 38 39 int i __attribute__((nonnull)); // expected-warning {{'nonnull' attribute only applies to functions, methods, and parameters}} 40 int j __attribute__((returns_nonnull)); // expected-warning {{'returns_nonnull' attribute only applies to functions and methods}} 41 void *test_no_fn_proto() __attribute__((returns_nonnull)); // no-warning 42 void *test_with_fn_proto(void) __attribute__((returns_nonnull)); // no-warning 43 44 __attribute__((returns_nonnull)) 45 void *test_bad_returns_null(void) { 46 return 0; // expected-warning {{null returned from function that requires a non-null return value}} 47 } 48 49 void PR18795(int (*g)(const char *h, ...) __attribute__((nonnull(1))) __attribute__((nonnull))) { 50 g(0); // expected-warning{{null passed to a callee that requires a non-null argument}} 51 } 52 void PR18795_helper() { 53 PR18795(0); // expected-warning{{null passed to a callee that requires a non-null argument}} 54 } 55 56 void vararg1(int n, ...) __attribute__((nonnull(2))); 57 void vararg1_test() { 58 vararg1(0); 59 vararg1(1, (void*)0); // expected-warning{{null passed}} 60 vararg1(2, (void*)0, (void*)0); // expected-warning{{null passed}} 61 vararg1(2, (void*)&vararg1, (void*)0); 62 } 63 64 void vararg2(int n, ...) __attribute__((nonnull, nonnull, nonnull)); 65 void vararg2_test() { 66 vararg2(0); 67 vararg2(1, (void*)0); // expected-warning{{null passed}} 68 vararg2(2, (void*)0, (void*)0); // expected-warning 2{{null passed}} 69 } 70 71 void vararg3(int n, ...) __attribute__((nonnull, nonnull(2), nonnull(3))); 72 void vararg3_test() { 73 vararg3(0); 74 vararg3(1, (void*)0); // expected-warning{{null passed}} 75 vararg3(2, (void*)0, (void*)0); // expected-warning 2{{null passed}} 76 } 77 78 void redecl(void *, void *); 79 void redecl(void *, void *) __attribute__((nonnull(1))); 80 void redecl(void *, void *) __attribute__((nonnull(2))); 81 void redecl(void *, void *); 82 void redecl_test(void *p) { 83 redecl(p, 0); // expected-warning{{null passed}} 84 redecl(0, p); // expected-warning{{null passed}} 85 } 86 87 // rdar://18712242 88 #define NULL (void*)0 89 __attribute__((__nonnull__)) 90 int evil_nonnull_func(int* pointer, void * pv) 91 { 92 if (pointer == NULL) { // expected-warning {{comparison of nonnull parameter 'pointer' equal to a null pointer is false on first encounter}} 93 return 0; 94 } else { 95 return *pointer; 96 } 97 98 pointer = pv; 99 if (!pointer) 100 return 0; 101 else 102 return *pointer; 103 104 if (pv == NULL) {} // expected-warning {{comparison of nonnull parameter 'pv' equal to a null pointer is false on first encounter}} 105 } 106 107 void set_param_to_null(int**); 108 int another_evil_nonnull_func(int* pointer, char ch, void * pv) __attribute__((nonnull(1, 3))); 109 int another_evil_nonnull_func(int* pointer, char ch, void * pv) { 110 if (pointer == NULL) { // expected-warning {{comparison of nonnull parameter 'pointer' equal to a null pointer is false on first encounter}} 111 return 0; 112 } else { 113 return *pointer; 114 } 115 116 set_param_to_null(&pointer); 117 if (!pointer) 118 return 0; 119 else 120 return *pointer; 121 122 if (pv == NULL) {} // expected-warning {{comparison of nonnull parameter 'pv' equal to a null pointer is false on first encounter}} 123 } 124 125 extern void *returns_null(void**); 126 extern void FOO(); 127 extern void FEE(); 128 129 extern void *pv; 130 __attribute__((__nonnull__)) 131 void yet_another_evil_nonnull_func(int* pointer) 132 { 133 while (pv) { 134 // This comparison will not be optimized away. 135 if (pointer) { // expected-warning {{nonnull parameter 'pointer' will evaluate to 'true' on first encounter}} 136 FOO(); 137 } else { 138 FEE(); 139 } 140 pointer = returns_null(&pv); 141 } 142 } 143 144 void pr21668_1(__attribute__((nonnull)) const char *p, const char *s) { 145 if (p) // expected-warning {{nonnull parameter 'p' will evaluate to 'true' on first encounter}} 146 ; 147 if (s) // No warning 148 ; 149 } 150 151 void pr21668_2(__attribute__((nonnull)) const char *p) { 152 p = 0; 153 if (p) // No warning 154 ; 155 } 156
