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 | |