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> |
Ted Kremenek | 8c3e7fb | 2008-09-16 23:24:45 +0000 | [diff] [blame^] | 4 | #include <assert.h> |
Ted Kremenek | 0fe33bc | 2008-04-22 21:10:18 +0000 | [diff] [blame] | 5 | |
Ted Kremenek | 2f54af4 | 2008-04-02 16:54:39 +0000 | [diff] [blame] | 6 | void f1(int *p) { |
| 7 | if (p) *p = 1; |
| 8 | else *p = 0; // expected-warning{{ereference}} |
| 9 | } |
Ted Kremenek | b9ab690 | 2008-04-21 23:44:17 +0000 | [diff] [blame] | 10 | |
| 11 | struct foo_struct { |
| 12 | int x; |
| 13 | }; |
| 14 | |
| 15 | int f2(struct foo_struct* p) { |
| 16 | |
| 17 | if (p) |
| 18 | p->x = 1; |
| 19 | |
Ted Kremenek | 3603d73 | 2008-04-21 23:45:26 +0000 | [diff] [blame] | 20 | return p->x++; // expected-warning{{Dereference of null pointer.}} |
Ted Kremenek | b9ab690 | 2008-04-21 23:44:17 +0000 | [diff] [blame] | 21 | } |
Ted Kremenek | 9704eac | 2008-04-22 04:56:55 +0000 | [diff] [blame] | 22 | |
| 23 | int f3(char* x) { |
| 24 | |
| 25 | int i = 2; |
| 26 | |
| 27 | if (x) |
| 28 | return x[i - 1]; |
| 29 | |
| 30 | return x[i+1]; // expected-warning{{Dereference of null pointer.}} |
| 31 | } |
| 32 | |
Ted Kremenek | e2013f5 | 2008-04-29 23:25:09 +0000 | [diff] [blame] | 33 | int f3_b(char* x) { |
| 34 | |
| 35 | int i = 2; |
| 36 | |
| 37 | if (x) |
| 38 | return x[i - 1]; |
| 39 | |
| 40 | return x[i+1]++; // expected-warning{{Dereference of null pointer.}} |
| 41 | } |
| 42 | |
Ted Kremenek | 0fe33bc | 2008-04-22 21:10:18 +0000 | [diff] [blame] | 43 | int f4(int *p) { |
| 44 | |
Daniel Dunbar | 4489fe1 | 2008-08-05 00:07:51 +0000 | [diff] [blame] | 45 | uintptr_t x = (uintptr_t) p; |
Ted Kremenek | 0fe33bc | 2008-04-22 21:10:18 +0000 | [diff] [blame] | 46 | |
| 47 | if (x) |
| 48 | return 1; |
| 49 | |
| 50 | int *q = (int*) x; |
| 51 | return *q; // expected-warning{{Dereference of null pointer.}} |
Ted Kremenek | a548846 | 2008-04-22 21:39:21 +0000 | [diff] [blame] | 52 | } |
| 53 | |
| 54 | int f5() { |
| 55 | |
| 56 | char *s = "hello world"; |
| 57 | return s[0]; // no-warning |
| 58 | } |
| 59 | |
Ted Kremenek | 7fb43c1 | 2008-09-01 19:57:52 +0000 | [diff] [blame] | 60 | int bar(int* p, int q) __attribute__((nonnull)); |
Ted Kremenek | 584def7 | 2008-07-22 00:46:16 +0000 | [diff] [blame] | 61 | |
| 62 | int f6(int *p) { |
Ted Kremenek | 7fb43c1 | 2008-09-01 19:57:52 +0000 | [diff] [blame] | 63 | return !p ? bar(p, 1) // expected-warning {{Null pointer passed as an argument to a 'nonnull' parameter}} |
| 64 | : bar(p, 0); // no-warning |
| 65 | } |
Ted Kremenek | 584def7 | 2008-07-22 00:46:16 +0000 | [diff] [blame] | 66 | |
Ted Kremenek | 22bda88 | 2008-07-31 20:31:27 +0000 | [diff] [blame] | 67 | int* qux(); |
| 68 | |
| 69 | int f7(int x) { |
| 70 | |
| 71 | int* p = 0; |
| 72 | |
| 73 | if (0 == x) |
| 74 | p = qux(); |
| 75 | |
| 76 | if (0 == x) |
| 77 | *p = 1; // no-warning |
| 78 | |
| 79 | return x; |
| 80 | } |
| 81 | |
Ted Kremenek | dd463b8 | 2008-08-16 00:45:40 +0000 | [diff] [blame] | 82 | int f8(int *p, int *q) { |
| 83 | if (!p) |
| 84 | if (p) |
| 85 | *p = 1; // no-warning |
| 86 | |
| 87 | if (q) |
| 88 | if (!q) |
| 89 | *q = 1; // no-warning |
| 90 | } |
Ted Kremenek | 8c3e7fb | 2008-09-16 23:24:45 +0000 | [diff] [blame^] | 91 | |
| 92 | int* qux(); |
| 93 | |
| 94 | int f9(int len) { |
| 95 | assert (len != 0); |
| 96 | int *p = 0; |
| 97 | |
| 98 | for (int i = 0; i < len; ++i) |
| 99 | p = foo(i); |
| 100 | |
| 101 | return *p++; // no-warning |
| 102 | } |