Ted Kremenek | d71ed26 | 2008-04-10 22:16:52 +0000 | [diff] [blame] | 1 | // RUN: clang -checker-simple -verify %s |
Ted Kremenek | 2f54af4 | 2008-04-02 16:54:39 +0000 | [diff] [blame] | 2 | |
Ted Kremenek | 0fe33bc | 2008-04-22 21:10:18 +0000 | [diff] [blame] | 3 | #include<stdint.h> |
| 4 | |
Ted Kremenek | 2f54af4 | 2008-04-02 16:54:39 +0000 | [diff] [blame] | 5 | void f1(int *p) { |
| 6 | if (p) *p = 1; |
| 7 | else *p = 0; // expected-warning{{ereference}} |
| 8 | } |
Ted Kremenek | b9ab690 | 2008-04-21 23:44:17 +0000 | [diff] [blame] | 9 | |
| 10 | struct foo_struct { |
| 11 | int x; |
| 12 | }; |
| 13 | |
| 14 | int f2(struct foo_struct* p) { |
| 15 | |
| 16 | if (p) |
| 17 | p->x = 1; |
| 18 | |
Ted Kremenek | 3603d73 | 2008-04-21 23:45:26 +0000 | [diff] [blame] | 19 | return p->x++; // expected-warning{{Dereference of null pointer.}} |
Ted Kremenek | b9ab690 | 2008-04-21 23:44:17 +0000 | [diff] [blame] | 20 | } |
Ted Kremenek | 9704eac | 2008-04-22 04:56:55 +0000 | [diff] [blame] | 21 | |
| 22 | int f3(char* x) { |
| 23 | |
| 24 | int i = 2; |
| 25 | |
| 26 | if (x) |
| 27 | return x[i - 1]; |
| 28 | |
| 29 | return x[i+1]; // expected-warning{{Dereference of null pointer.}} |
| 30 | } |
| 31 | |
Ted Kremenek | e2013f5 | 2008-04-29 23:25:09 +0000 | [diff] [blame] | 32 | int f3_b(char* x) { |
| 33 | |
| 34 | int i = 2; |
| 35 | |
| 36 | if (x) |
| 37 | return x[i - 1]; |
| 38 | |
| 39 | return x[i+1]++; // expected-warning{{Dereference of null pointer.}} |
| 40 | } |
| 41 | |
Ted Kremenek | 0fe33bc | 2008-04-22 21:10:18 +0000 | [diff] [blame] | 42 | int f4(int *p) { |
| 43 | |
| 44 | uintptr_t x = p; |
| 45 | |
| 46 | if (x) |
| 47 | return 1; |
| 48 | |
| 49 | int *q = (int*) x; |
| 50 | return *q; // expected-warning{{Dereference of null pointer.}} |
Ted Kremenek | a548846 | 2008-04-22 21:39:21 +0000 | [diff] [blame] | 51 | } |
| 52 | |
| 53 | int f5() { |
| 54 | |
| 55 | char *s = "hello world"; |
| 56 | return s[0]; // no-warning |
| 57 | } |
| 58 | |
Ted Kremenek | 584def7 | 2008-07-22 00:46:16 +0000 | [diff] [blame] | 59 | int bar(int* p) __attribute__((nonnull)); |
| 60 | |
| 61 | int f6(int *p) { |
| 62 | return !p ? bar(p) : *p; // expected-warning {{Null pointer passed as an argument to a 'nonnull' parameter}} |
| 63 | } |
| 64 | |
Ted Kremenek | 22bda88 | 2008-07-31 20:31:27 +0000 | [diff] [blame^] | 65 | int* qux(); |
| 66 | |
| 67 | int f7(int x) { |
| 68 | |
| 69 | int* p = 0; |
| 70 | |
| 71 | if (0 == x) |
| 72 | p = qux(); |
| 73 | |
| 74 | if (0 == x) |
| 75 | *p = 1; // no-warning |
| 76 | |
| 77 | return x; |
| 78 | } |
| 79 | |
Ted Kremenek | 584def7 | 2008-07-22 00:46:16 +0000 | [diff] [blame] | 80 | |