77 lines · c
1// RUN: %clang_analyze_cc1 -verify %s \2// RUN: -analyzer-checker=core3 4extern int *get_pointer();5 6int *test_add1(int offset) {7 int *p = get_pointer();8 if (p) {}9 return p + offset; // expected-warning{{Addition of a null pointer (from variable 'p') and a probably nonzero integer value (from variable 'offset') may result in undefined behavior}}10}11 12int *test_add2(int offset) {13 int *p = get_pointer();14 if (p) {}15 if (offset) {}16 return p + offset; // expected-warning{{Addition of a null pointer (from variable 'p') and a nonzero integer value (from variable 'offset') results in undefined behavior}}17}18 19int *test_add3(int offset) {20 int *p = get_pointer();21 if (p) {}22 if (offset != 0) return 0;23 return p + offset;24}25 26int *test_add4(int offset) {27 int *p = get_pointer();28 if (p) {}29 if (offset == 0) return 0;30 return p + offset; // expected-warning{{Addition of a null pointer (from variable 'p') and a nonzero integer value (from variable 'offset') results in undefined behavior}}31}32 33int *test_add5(int offset) {34 int *p = get_pointer();35 if (p) {}36 return offset + p; // expected-warning{{Addition of a probably nonzero integer value (from variable 'offset') and a null pointer (from variable 'p') may result in undefined behavior}}37}38 39int *test_sub1(int offset) {40 int *p = get_pointer();41 if (p) {}42 return p - offset; // expected-warning{{Subtraction of a null pointer (from variable 'p') and a probably nonzero integer value (from variable 'offset') may result in undefined behavior}}43}44 45int test_sub_p1() {46 int *p = get_pointer();47 if (p) {}48 return p - p;49}50 51int test_sub_p2() {52 int *p1 = get_pointer();53 int *p2 = get_pointer();54 if (p1) {}55 if (p2) {}56 return p1 - p2;57 // expected-warning@-1{{Subtraction of a non-null pointer (from variable 'p1') and a null pointer (from variable 'p2') results in undefined behavior}}58 // expected-warning@-2{{Subtraction of a null pointer (from variable 'p1') and a non-null pointer (from variable 'p2') results in undefined behavior}}59}60 61int test_sub_p3() {62 int *p1 = get_pointer();63 int *p2 = get_pointer();64 if (p1) {}65 return p1 - p2; // expected-warning{{Subtraction of a null pointer (from variable 'p1') and a probably non-null pointer (from variable 'p2') may result in undefined behavior}}66}67 68struct S {69 char *p;70 int offset;71};72 73char *test_struct(struct S s) {74 if (s.p) {}75 return s.p + s.offset; // expected-warning{{Addition of a null pointer (via field 'p') and a probably nonzero integer value (via field 'offset') may result in undefined behavior}}76}77