| 1 | // RUN: %clang_cc1 -fsyntax-only -verify %s |
| 2 | // rdar://9584012 |
| 3 | // |
| 4 | // Verify All warnings are still issued with the option -fno-delete-null-pointer-checks |
| 5 | // if nullptr is passed to function with nonnull attribute. |
| 6 | // RUN: %clang_cc1 -fsyntax-only -fno-delete-null-pointer-checks -verify %s |
| 7 | |
| 8 | typedef struct { |
| 9 | char *str; |
| 10 | } Class; |
| 11 | |
| 12 | typedef union { |
| 13 | Class *object; |
| 14 | } Instance __attribute__((transparent_union)); |
| 15 | |
| 16 | __attribute__((nonnull(1))) void Class_init(Instance this, char *str) { |
| 17 | this.object->str = str; |
| 18 | } |
| 19 | |
| 20 | int main(void) { |
| 21 | Class *obj; |
| 22 | Class_init(0, "Hello World"); // expected-warning {{null passed to a callee that requires a non-null argument}} |
| 23 | Class_init(obj, "Hello World"); |
| 24 | } |
| 25 | |
| 26 | void foo(const char *str) __attribute__((nonnull("foo"))); // expected-error{{'nonnull' attribute requires parameter 1 to be an integer constant}} |
| 27 | 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}} |
| 28 | |
| 29 | void baz(__attribute__((nonnull)) const char *str); |
| 30 | void baz2(__attribute__((nonnull(1))) const char *str); // expected-warning {{'nonnull' attribute when used on parameters takes no arguments}} |
| 31 | void baz3(__attribute__((nonnull)) int x); // expected-warning {{'nonnull' attribute only applies to pointer arguments}} |
| 32 | |
| 33 | void test_baz() { |
| 34 | baz(0); // expected-warning {{null passed to a callee that requires a non-null argument}} |
| 35 | baz2(0); // no-warning |
| 36 | baz3(0); // no-warning |
| 37 | } |
| 38 | |
| 39 | void test_void_returns_nonnull(void) __attribute__((returns_nonnull)); // expected-warning {{'returns_nonnull' attribute only applies to return values that are pointers}} |
| 40 | int test_int_returns_nonnull(void) __attribute__((returns_nonnull)); // expected-warning {{'returns_nonnull' attribute only applies to return values that are pointers}} |
| 41 | void *test_ptr_returns_nonnull(void) __attribute__((returns_nonnull)); // no-warning |
| 42 | |
| 43 | int i __attribute__((nonnull)); // expected-warning {{'nonnull' attribute only applies to functions, methods, and parameters}} |
| 44 | int j __attribute__((returns_nonnull)); // expected-warning {{'returns_nonnull' attribute only applies to Objective-C methods and functions}} |
| 45 | void *test_no_fn_proto() __attribute__((returns_nonnull)); // no-warning |
| 46 | void *test_with_fn_proto(void) __attribute__((returns_nonnull)); // no-warning |
| 47 | |
| 48 | __attribute__((returns_nonnull)) |
| 49 | void *test_bad_returns_null(void) { |
| 50 | return 0; // expected-warning {{null returned from function that requires a non-null return value}} |
| 51 | } |
| 52 | |
| 53 | void PR18795(int (*g)(const char *h, ...) __attribute__((nonnull(1))) __attribute__((nonnull))) { |
| 54 | g(0); // expected-warning{{null passed to a callee that requires a non-null argument}} |
| 55 | } |
| 56 | void PR18795_helper() { |
| 57 | PR18795(0); // expected-warning{{null passed to a callee that requires a non-null argument}} |
| 58 | } |
| 59 | |
| 60 | void vararg1(int n, ...) __attribute__((nonnull(2))); |
| 61 | void vararg1_test() { |
| 62 | vararg1(0); |
| 63 | vararg1(1, (void*)0); // expected-warning{{null passed}} |
| 64 | vararg1(2, (void*)0, (void*)0); // expected-warning{{null passed}} |
| 65 | vararg1(2, (void*)&vararg1, (void*)0); |
| 66 | } |
| 67 | |
| 68 | void vararg2(int n, ...) __attribute__((nonnull, nonnull, nonnull)); |
| 69 | void vararg2_test() { |
| 70 | vararg2(0); |
| 71 | vararg2(1, (void*)0); // expected-warning{{null passed}} |
| 72 | vararg2(2, (void*)0, (void*)0); // expected-warning 2{{null passed}} |
| 73 | } |
| 74 | |
| 75 | void vararg3(int n, ...) __attribute__((nonnull, nonnull(2), nonnull(3))); |
| 76 | void vararg3_test() { |
| 77 | vararg3(0); |
| 78 | vararg3(1, (void*)0); // expected-warning{{null passed}} |
| 79 | vararg3(2, (void*)0, (void*)0); // expected-warning 2{{null passed}} |
| 80 | } |
| 81 | |
| 82 | void redecl(void *, void *); |
| 83 | void redecl(void *, void *) __attribute__((nonnull(1))); |
| 84 | void redecl(void *, void *) __attribute__((nonnull(2))); |
| 85 | void redecl(void *, void *); |
| 86 | void redecl_test(void *p) { |
| 87 | redecl(p, 0); // expected-warning{{null passed}} |
| 88 | redecl(0, p); // expected-warning{{null passed}} |
| 89 | } |
| 90 | |
| 91 | // rdar://18712242 |
| 92 | #define NULL (void*)0 |
| 93 | __attribute__((__nonnull__)) // expected-note 2{{declared 'nonnull' here}} |
| 94 | int evil_nonnull_func(int* pointer, void * pv) |
| 95 | { |
| 96 | if (pointer == NULL) { // expected-warning {{comparison of nonnull parameter 'pointer' equal to a null pointer is 'false' on first encounter}} |
| 97 | return 0; |
| 98 | } else { |
| 99 | return *pointer; |
| 100 | } |
| 101 | |
| 102 | pointer = pv; |
| 103 | if (!pointer) |
| 104 | return 0; |
| 105 | else |
| 106 | return *pointer; |
| 107 | |
| 108 | if (pv == NULL) {} // expected-warning {{comparison of nonnull parameter 'pv' equal to a null pointer is 'false' on first encounter}} |
| 109 | } |
| 110 | |
| 111 | void set_param_to_null(int**); |
| 112 | int another_evil_nonnull_func(int* pointer, char ch, void * pv) __attribute__((nonnull(1, 3))); // expected-note 2{{declared 'nonnull' here}} |
| 113 | int another_evil_nonnull_func(int* pointer, char ch, void * pv) { |
| 114 | if (pointer == NULL) { // expected-warning {{comparison of nonnull parameter 'pointer' equal to a null pointer is 'false' on first encounter}} |
| 115 | return 0; |
| 116 | } else { |
| 117 | return *pointer; |
| 118 | } |
| 119 | |
| 120 | set_param_to_null(&pointer); |
| 121 | if (!pointer) |
| 122 | return 0; |
| 123 | else |
| 124 | return *pointer; |
| 125 | |
| 126 | if (pv == NULL) {} // expected-warning {{comparison of nonnull parameter 'pv' equal to a null pointer is 'false' on first encounter}} |
| 127 | } |
| 128 | |
| 129 | extern void *returns_null(void**); |
| 130 | extern void FOO(); |
| 131 | extern void FEE(); |
| 132 | |
| 133 | extern void *pv; |
| 134 | __attribute__((__nonnull__)) // expected-note {{declared 'nonnull' here}} |
| 135 | void yet_another_evil_nonnull_func(int* pointer) |
| 136 | { |
| 137 | while (pv) { |
| 138 | // This comparison will not be optimized away. |
| 139 | if (pointer) { // expected-warning {{nonnull parameter 'pointer' will evaluate to 'true' on first encounter}} |
| 140 | FOO(); |
| 141 | } else { |
| 142 | FEE(); |
| 143 | } |
| 144 | pointer = returns_null(&pv); |
| 145 | } |
| 146 | } |
| 147 | |
| 148 | void pr21668_1(__attribute__((nonnull)) const char *p, const char *s) { // expected-note {{declared 'nonnull' here}} |
| 149 | if (p) // expected-warning {{nonnull parameter 'p' will evaluate to 'true' on first encounter}} |
| 150 | ; |
| 151 | if (s) // No warning |
| 152 | ; |
| 153 | } |
| 154 | |
| 155 | void pr21668_2(__attribute__((nonnull)) const char *p) { |
| 156 | p = 0; |
| 157 | if (p) // No warning |
| 158 | ; |
| 159 | } |
| 160 | |
| 161 | __attribute__((returns_nonnull)) void *returns_nonnull_whee(); // expected-note 6{{declared 'returns_nonnull' here}} |
| 162 | |
| 163 | void returns_nonnull_warning_tests() { |
| 164 | if (returns_nonnull_whee() == NULL) {} // expected-warning {{comparison of nonnull function call 'returns_nonnull_whee()' equal to a null pointer is 'false' on first encounter}} |
| 165 | |
| 166 | if (returns_nonnull_whee() != NULL) {} // expected-warning {{comparison of nonnull function call 'returns_nonnull_whee()' not equal to a null pointer is 'true' on first encounter}} |
| 167 | |
| 168 | if (returns_nonnull_whee()) {} // expected-warning {{nonnull function call 'returns_nonnull_whee()' will evaluate to 'true' on first encounter}} |
| 169 | if (!returns_nonnull_whee()) {} // expected-warning {{nonnull function call 'returns_nonnull_whee()' will evaluate to 'true' on first encounter}} |
| 170 | |
| 171 | int and_again = !returns_nonnull_whee(); // expected-warning {{nonnull function call 'returns_nonnull_whee()' will evaluate to 'true' on first encounter}} |
| 172 | and_again = !returns_nonnull_whee(); // expected-warning {{nonnull function call 'returns_nonnull_whee()' will evaluate to 'true' on first encounter}} |
| 173 | } |
| 174 | |
| 175 | void pr30828(char *p __attribute__((nonnull))); |
| 176 | void pr30828(char *p) {} |
| 177 | |
| 178 | void call_pr30828() { |
| 179 | pr30828(0); // expected-warning {{null passed to a callee that requires a non-null argument}} |
| 180 | } |
| 181 | |