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// RUN: %clang_analyze_cc1 -analyzer-checker=core -analyzer-output=text -verify %s
struct S {
int *x;
int y;
};
S &getSomeReference();
void test(S *p) {
S &r = *p; //expected-note {{'r' initialized here}}
if (p) return;
//expected-note@-1{{Taking false branch}}
//expected-note@-2{{Assuming 'p' is null}}
r.y = 5; // expected-warning {{Access to field 'y' results in a dereference of a null pointer (loaded from variable 'r')}}
// expected-note@-1{{Access to field 'y' results in a dereference of a null pointer (loaded from variable 'r')}}
}
void testRefParam(int *ptr) {
int &ref = *ptr; // expected-note {{'ref' initialized here}}
if (ptr)
// expected-note@-1{{Assuming 'ptr' is null}}
// expected-note@-2{{Taking false branch}}
return;
extern void use(int &ref);
use(ref); // expected-warning{{Forming reference to null pointer}}
// expected-note@-1{{Forming reference to null pointer}}
}
int testRefToNullPtr() {
int *p = 0; // expected-note {{'p' initialized to a null pointer value}}
int *const &p2 = p; // expected-note{{'p2' initialized here}}
int *p3 = p2; // expected-note {{'p3' initialized to a null pointer value}}
return *p3; // expected-warning {{Dereference of null pointer}}
// expected-note@-1{{Dereference of null pointer}}
}
int testRefToNullPtr2() {
int *p = 0; // expected-note {{'p' initialized to a null pointer value}}
int *const &p2 = p; // expected-note{{'p2' initialized here}}
return *p2; //expected-warning {{Dereference of null pointer}}
// expected-note@-1{{Dereference of null pointer}}
}
void testMemberNullPointerDeref() {
struct Wrapper {char c; int *ptr; };
Wrapper w = {'a', nullptr}; // expected-note {{'w.ptr' initialized to a null pointer value}}
*w.ptr = 1; //expected-warning {{Dereference of null pointer}}
// expected-note@-1{{Dereference of null pointer}}
}
void testMemberNullReferenceDeref() {
struct Wrapper {char c; int &ref; };
Wrapper w = {.c = 'a', .ref = *(int *)0 }; // expected-note {{'w.ref' initialized to a null pointer value}}
// expected-warning@-1 {{binding dereferenced null pointer to reference has undefined behavior}}
w.ref = 1; //expected-warning {{Dereference of null pointer}}
// expected-note@-1{{Dereference of null pointer}}
}
void testReferenceToPointerWithNullptr() {
int *i = nullptr; // expected-note {{'i' initialized to a null pointer value}}
struct Wrapper {char c; int *&a;};
Wrapper w {'c', i}; // expected-note{{'w.a' initialized here}}
*(w.a) = 25; // expected-warning {{Dereference of null pointer}}
// expected-note@-1 {{Dereference of null pointer}}
}
void testNullReferenceToPointer() {
struct Wrapper {char c; int *&a;};
Wrapper w {'c', *(int **)0 }; // expected-note{{'w.a' initialized to a null pointer value}}
// expected-warning@-1 {{binding dereferenced null pointer to reference has undefined behavior}}
w.a = nullptr; // expected-warning {{Dereference of null pointer}}
// expected-note@-1 {{Dereference of null pointer}}
}
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