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// RUN: %clang_cc1 -std=c++11 -Wno-conversion-null -analyze -analyzer-checker=core -analyzer-store region -verify %s
// test to see if nullptr is detected as a null pointer
void foo1(void) {
char *np = nullptr;
*np = 0; // expected-warning{{Dereference of null pointer}}
}
// check if comparing nullptr to nullptr is detected properly
void foo2(void) {
char *np1 = nullptr;
char *np2 = np1;
char c;
if (np1 == np2)
np1 = &c;
*np1 = 0; // no-warning
}
// invoving a nullptr in a more complex operation should be cause a warning
void foo3(void) {
struct foo {
int a, f;
};
char *np = nullptr;
// casting a nullptr to anything should be caught eventually
int *ip = &(((struct foo *)np)->f);
*ip = 0; // expected-warning{{Dereference of null pointer}}
// should be error here too, but analysis gets stopped
// *np = 0;
}
// nullptr is implemented as a zero integer value, so should be able to compare
void foo4(void) {
char *np = nullptr;
if (np != 0)
*np = 0; // no-warning
char *cp = 0;
if (np != cp)
*np = 0; // no-warning
}
int pr10372(void *& x) {
// GNU null is a pointer-sized integer, not a pointer.
x = __null;
// This used to crash.
return __null;
}
void zoo1() {
char **p = 0;
delete *(p + 0); // expected-warning{{Dereference of null pointer}}
}
void zoo2() {
int **a = 0;
int **b = 0;
asm ("nop"
:"=a"(*a)
:"0"(*b) // expected-warning{{Dereference of null pointer}}
);
}
int exprWithCleanups() {
struct S {
S(int a):a(a){}
~S() {}
int a;
};
int *x = 0;
return S(*x).a; // expected-warning{{Dereference of null pointer}}
}
int materializeTempExpr() {
int *n = 0;
struct S {
int a;
S(int i): a(i) {}
};
const S &s = S(*n); // expected-warning{{Dereference of null pointer}}
return s.a;
}
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