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// RUN: %clang_analyze_cc1 -x c -analyzer-checker=core -analyzer-output=text -verify %s
#define NULL 0
int test_noparammacro() {
int *x = NULL; // expected-note{{'x' initialized to a null pointer value}}
return *x; // expected-warning{{Dereference of null pointer (loaded from variable 'x')}}
// expected-note@-1{{Dereference of null pointer (loaded from variable 'x')}}
}
#define DYN_CAST(X) (X ? (char*)X : 0)
#define GENERATE_NUMBER(X) (0)
char test_assignment(int *param) {
char *param2;
param2 = DYN_CAST(param);
return *param2;
}
char test_declaration(int *param) {
char *param2 = DYN_CAST(param);
return *param2;
}
int coin();
int test_multi_decl(int *paramA, int *paramB) {
char *param1 = DYN_CAST(paramA), *param2 = DYN_CAST(paramB);
if (coin())
return *param1;
return *param2;
}
int testDivision(int a) {
int divider = GENERATE_NUMBER(2); // expected-note{{'divider' initialized to 0}}
return 1/divider; // expected-warning{{Division by zero}}
// expected-note@-1{{Division by zero}}
}
// Warning should not be suppressed if it happens in the same macro.
#define DEREF_IN_MACRO(X) int fn() {int *p = 0; return *p; }
DEREF_IN_MACRO(0) // expected-warning{{Dereference of null pointer}}
// expected-note@-1{{'p' initialized to a null}}
// expected-note@-2{{Dereference of null pointer}}
// Warning should not be suppressed if the null returned by the macro
// is not related to the warning.
#define RETURN_NULL() (0)
extern int* returnFreshPointer();
int noSuppressMacroUnrelated() {
int *x = RETURN_NULL();
x = returnFreshPointer(); // expected-note{{Value assigned to 'x'}}
if (x) {} // expected-note{{Taking false branch}}
// expected-note@-1{{Assuming 'x' is null}}
return *x; // expected-warning{{Dereference of null pointer}}
// expected-note@-1{{Dereference}}
}
// Value haven't changed by the assignment, but the null pointer
// did not come from the macro.
int noSuppressMacroUnrelatedOtherReason() {
int *x = RETURN_NULL();
x = returnFreshPointer();
x = 0; // expected-note{{Null pointer value stored to 'x'}}
return *x; // expected-warning{{Dereference of null pointer}}
// expected-note@-1{{Dereference}}
}
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