llvm-project/clang/test/Analysis/nullptr.cpp

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// RUN: %clang_cc1 -std=c++11 -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;
}