1 // RUN: %clang_analyze_cc1 -x c -analyzer-checker=core -analyzer-output=text -verify %s
5 int test_noparammacro() {
6 int *x = NULL; // expected-note{{'x' initialized to a null pointer value}}
7 return *x; // expected-warning{{Dereference of null pointer (loaded from variable 'x')}}
8 // expected-note@-1{{Dereference of null pointer (loaded from variable 'x')}}
11 #define DYN_CAST(X) (X ? (char*)X : 0)
12 #define GENERATE_NUMBER(X) (0)
14 char test_assignment(int *param) {
16 param2 = DYN_CAST(param);
20 char test_declaration(int *param) {
21 char *param2 = DYN_CAST(param);
27 int test_multi_decl(int *paramA, int *paramB) {
28 char *param1 = DYN_CAST(paramA), *param2 = DYN_CAST(paramB);
34 int testDivision(int a) {
35 int divider = GENERATE_NUMBER(2); // expected-note{{'divider' initialized to 0}}
36 return 1/divider; // expected-warning{{Division by zero}}
37 // expected-note@-1{{Division by zero}}
40 // Warning should not be suppressed if it happens in the same macro.
41 #define DEREF_IN_MACRO(X) int fn() {int *p = 0; return *p; }
43 DEREF_IN_MACRO(0) // expected-warning{{Dereference of null pointer}}
44 // expected-note@-1{{'p' initialized to a null}}
45 // expected-note@-2{{Dereference of null pointer}}
47 // Warning should not be suppressed if the null returned by the macro
48 // is not related to the warning.
49 #define RETURN_NULL() (0)
50 extern int* returnFreshPointer();
51 int noSuppressMacroUnrelated() {
52 int *x = RETURN_NULL();
53 x = returnFreshPointer(); // expected-note{{Value assigned to 'x'}}
54 if (x) {} // expected-note{{Taking false branch}}
55 // expected-note@-1{{Assuming 'x' is null}}
56 return *x; // expected-warning{{Dereference of null pointer}}
57 // expected-note@-1{{Dereference}}
60 // Value haven't changed by the assignment, but the null pointer
61 // did not come from the macro.
62 int noSuppressMacroUnrelatedOtherReason() {
63 int *x = RETURN_NULL();
64 x = returnFreshPointer();
65 x = 0; // expected-note{{Null pointer value stored to 'x'}}
66 return *x; // expected-warning{{Dereference of null pointer}}
67 // expected-note@-1{{Dereference}}